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1140 MIW Draft SWPPP 3.15.17 nmrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmimrmi Storm Water Management Report and Storm Water Pollution Prevention Plan for the proposed Mohawk Industrial Werks Project 140 Carey Road, Queensbury NY 12804 Warren County, New York Prepared For. 140 Carey Road, LLC 140 Carey Road Queensbury, NY 12804 Prepared By: VISION Engineering, LLC 206 Glen Street Suite 56 Glens Falls, New York 12801 March 15, 2017 torim Water IC:IoI1 .sflon IC:Ireven lon IC:Dbn Mohawk IIu"du,,;trbIi I Werks IC:311IT jjc t ATTACHMENTS SWPPP Certifications Rainfall Data NRCS Soil Information Site Resources and Verification Documentation Watershed and Drainage Mapping HydroCAD Hydrologic Models and Calculations a. Pre-Development b. Post Development c. Cpv, Qp, Qf, 50-year Analysis Calculations NYSDEC Notice of Intent (NOI) Water Quality and Individual Stormwater Device Calculations Sample Stormwater Control Facility Maintenance Agreement NYSDEC SPDES General Permit for Stormwater Discharges from Construction Activity Permit No. GP-0-15-002 NYSDEC SWPPP and E&S Control Plan Checklists Construction Stormwater Inspection Manual NYSDEC Notice of Termination Form Construction Details & Drawings torim Water IC:IoIH .salon IC:Ireven lon IC:DIan MohawkIIu"du,,;tiJai II Werks IC:DuIT jjc t PART I Section 1.0 Introduction 1.1 Project Description The Mohawk Industrial Werks project proposes development of portions of a 6.454 acre parcel located in the Town of Queensbury. The site is situated in a commercial light industrial zone and lies within a partially developed industrial park (Carey Road Industrial Park), previously subdivided by the prior owners of the land. Approximately half of the industrial park lots are now developed. The parcel consists of vacant forested land. The predominant vegetation is a mixture of hardwood and evergreen trees, of varying size, age, and species typical of this region (white pine, maple, oak, beech, popular, etc). The parcel will be access from an entrance drive on Carey Road. The parcel is 6.454 acres in total with +/- 2.3 acres planned for disturbance including impervious pavements and buildings, utilities, and other site amenities. The project is zoning compliant and includes; a 15,375 sf commercial building, perimeter driving lanes and parking areas, an entrance from the Town ROW, site landscaping and lighting, stormwater management, municipal water, onsite sewage disposal, and other utility services for the facility. This report will outline the Stormwater Best Management Practices (BMP's) that will be implemented on the site to control storm water runoff water quality and quantity for the proposed project as a result of planned impervious surfaces. 1.2 Purpose The purpose of this stormwater pollution prevention plan (SWPPP) is to demonstrate stormwater compliance with the Town of Queensbury Stormwater Code and New York State Department of Environmental Conservation (NYSDEC) stormwater management requirements for coverage under NYSDEC SPDES General Permit for Stormwater Discharges from Construction Activity Permit No. GP-0-15-002 for the project site. This SWPPP provides the calculations and results of the drainage analysis for the proposed development demonstrating compliance with stormwater water quality requirements and peak rate control measures required for the newly created impervious areas proposed on the project site in accordance with the governing regulations. The volumes and rates of generated runoff from proposed impervious cover (roads, driveways, and buildings) will be controlled such that they are reduced and where required less than or equal to pre-development levels up to and including the 100-year design storm event. Maintaining certain post-development runoff rates to pre-development conditions will result in minimal impact on adjacent properties and the existing drainage systems, along with minimizing impacts on downstream areas this site is tributary to. This project will also include stormwater best management practices to promote runoff reduction (when possible) and improve runoff torim Water IC:I IIIIa.sflon IC:Irevenflon IC:DIan MohawkIIu"du,,;tiJai II Werks IC:DuIT jjc t water quality, affording an opportunity to minimize downstream sediment transport and pollutant loading which may be caused by the proposed development. The BMP's that will be used to control stormwater on the site will be: • preservation of undisturbed areas • preservation of existing vegetated or forested land • stormwater basins to promote groundwater recharge and runoff reduction • inclusion of sedimentation basins to reduce/control runoff and deplete pollutants/sediment • limiting overall site disturbance to planned development areas 1.3 Methodology This study was prepared using the Soil Conservation Service/National Resource Conservation Service's (SCS/NRCS) Method as contained in the USDA Soil Conservation Service Publication TR-55 "Urban Hydrology for Small Watersheds". The TR-55 method outlines procedures for calculating peak rates of runoff resulting from precipitation events to developing runoff hydrographs. The TR-55 procedure simulates a watershed using the drainage area, curve number (CN), and time of concentration (Tc) for each watershed or sub-area within the overall analysis area. The curve number is a land sensitive coefficient that dictates the relationship between total rainfall depth and direct storm runoff. Site testing indicates loamy sand soils near the surface (upper 1-3 feet) with deep well drained medium to coarse sands at lower depths. There is no evidence of shallow groundwater, bedrock or any other limiting subsurface feature present on the property. Underlying soils appear to correspond to Warren County soil mapping for this location. Hydrologic curve numbers (CN) used to determine the runoff characteristics were assumed to be hydrologic soil group A soil type, as follows; 39 in newly created grass/lawn areas, 30 for existing forested areas, and 98 for impervious surfaces to include pavements and buildings. The time of concentration is defined as the time for runoff to travel from the hydraulically most distant point of the watershed to a point of interest. Times of concentration (Tc) paths determined for pre development and post development subareas were used to compute the peak discharge from an area. A minimum Tc of 6 minutes was used in the analysis. Sub- catchment areas CN numbers and Tc paths used for the project analysis are defined in the HydroCad Storm Water Modeling reports included in this report and are identified on Watershed Drawings SW-1 and SW-2 for both the pre- and post-development conditions. Stormwater calculations comparing analytically pre- and post-development runoff volumes and rates were performed utilizing SCS TR-20 and TR-55 methodology incorporated into HydroCad Storm Water Modeling Software for Type II storm events. The Type II rainfall amounts used for the 1- year, 2-year, 10-year, 50-year, and 100-year 24 hour storm durations were 2.1-inches, 2.75- inches, 3.8-inches, 4.9-inches, and 6.0-inches, respectively. torim Water IC:IoIH .salon IC:Ireven lon IC:DIan MohawkIIu"du,,;tiJai II Werks IC:DuIT jjc t 1.4 Design Requirements Design requirements for the proposed project are based upon the NYSDEC Stormwater Management Design Manual and the Town of Queensbury Town Code Chapter 147 for Stormwater Management that require stormwater water quality treatment, rate control, and volume control in the form of storage and runoff reduction when possible. In addition erosion and sediment control measures and planning must be incorporated into the design to accommodate construction and land disturbance needs. This will prevent migration of sediment off site and prevent any contamination or impact on adjacent drainage features and/or property. The above referenced standards established stormwater water quality requirements for project sites and require that runoff from newly created impervious areas be "pre-treated" prior to being discharged from the site. This will help to attain pollutant load reduction standards and goals intended by the implementation of the regulations. In summary, the following requirements are necessary for compliance with the above referenced standards; • Meet or exceed Water Quailty Volume requirements (WQv) • Meet or exceed Runoff Reduction Volume requirements (RRv) (when site conditions allow) • Meet or exceed requirements for Channel protection Volume (Cpv) (1-year storm) • Meet or exceed requirements for Overbank Flood Control (Qp) (10-year storm) • Meet or exceed requirements for Extreme Storm Control (Qf) (100-year storm) • Meet or exceed Town requirements for rate and volume control for the 50-year storm Section 2.0 Design Concept 2.1 Design Objectives: ➢ Control and treat stormwater runoff in disconnected treatment train system that will protect the water quality of nearby tributaries and/or other water features and resources. ➢ Implement low-impact design techniques for stormwater management to minimize adverse impacts on water bodies, disturbance of land, land clearing, creation of unnecessary impervious surfaces, and to maximize preservation of existing vegetation, buffers, and sensitive area on the project site. ➢ Provide advanced BMP water quality treatment of stormwater runoff and to promote groundwater recharge, when conditions allow, to offset increases in impervious pavement area or less permeable ground cover. ➢ Control pre- to post-development conditions in runoff rate from all design storm events. ➢ Size the stormwater conveyance system of swales and structures/devices to convey the runoff generated from the design storm events. ➢ Provide protection to prevent downstream erosion, flooding, and damage to structures, torim Water IC:IoI1 .sflon IC:Ireven lon IC:DIan MohawkIIu"du,,;tiJai II Werks IC:DuIT jjc t roads, and subsequent stormwater conveyance systems by accommodating the one hundred-year twenty four hour duration storm event. ➢ Minimize erosion potential from new construction and site disturbance activities and to prevent sediment transport. ➢ Comply with Town of Queensbury Stormwater Management Regulations, NYSDEC Unified Stormwater Sizing Criteria and requirements for coverage under NYSDEC SPDES General Permit for Stormwater Discharges from Construction Activity. Section 3.0 Existing Conditions 3.1 Historical and Natural Resources or Habitat It is presumed that because the proposed project is part of a previously approved larger development plan, the Carey Road Industrial Park, that the parcel was previously determined to have no adverse environmental impact on threatened or endangered species or habitat or on the presence of historic cultural resources. Further, the Town of Queensbury Planning Board, as lead agency for this project, conducts an environmental review (as part of the SEQRA) for the proposed project relative to impacts on such important cultural/natural resources and habitat. Threatened and endangered species and their habitat is one criteria evaluated by the Planning Board as lead agent. In addition, the project impacts on important historic cultural resources are considered. At this time, it is presumed the Planning Board, as lead agent, will determine there are no significant adverse impacts which result from the project. Upon receiving such determination, a copy of the SEQRA determination of significance and associated approving motion will be incorporated into the project appendices as confirmation. Preliminary investigation using available information from existing sources has concluded the following about the project location; - There are no records of rare or state listed animals or plants at the project site or in its immediate vicinity, as determined from NYSDEC Division of Fish and Wildlife, NY Natural Heritage Program databases. - There are no known archaeological sites within the Area of Potential Effect (project limits), and the closest record location, according to NYSPRHP databases, consisting of historic cultural importance is 0.5 miles from the project. 3.2 Site Soils The project site primarily consists of poorly graded well drained medium to coarse sandy soil conditions to extensive depths. The upper portion of the subsurface strata, just beneath topsoil and organic matter, consists of loamy fine sand of varying thickness to a maximum depth of approximately three feet. Site soils correspond to soil mapping for the area. One soil designation exists on the site according to the USGS Warren County Soil Map, that being torim Water IC:IoI1 .sflon IC:Ireventon IC:DIan MohawkIIu"du,,;tiJai II Werks IC:DuIT jjc t Oakville loamy fine sand. Based on field investigations and testing conducted on site to verify the feasibility of infiltration (three infiltration tests were performed) infiltration rates of the site range between 102 in/hr to 240 in/hr (hydrocad limits this value to 99 in/hr). The test data has been specified on site plan drawings for the project. Because no onsite groundwater or impervious was observed to depths up to ten feet or more, the site is well suited for infiltration. The stormwater design manual specifies a minimum of three feet separation between the floor of any infiltration practice to groundwater or impervious, which is achievable at any location on site. 3.3 Existing On-Site Watersheds The existing site area totals 6.454 acres, and consists of three generalized drainage areas, one which flows to a depression on the parcel and remains on site, and two others, one with runoff towards a low point at the north-ease corner of the site, and another with runoff towards the south-east corner of the site. Included in this report is map SW-1 depicting the pre-development drainage areas or sub-catchments used in the pre-development analysis. Design points are points of interest where discharge from the project occur to assess downstream impacts of the development. There are two offsite discharge points of interest utilized for the existing conditions calculations for the project; - E2— Existing area 2 which discharges offsite to the north. - E3— Existing area 3 which discharges offsite to the south. 3.4 Off-Site Watersheds Since the site is located upon a hill or mound and contains the local high point in terms of ground elevation (in the south-west corner), there are no offsite areas tributary to the site which require inclusion in the analysis, other than small tributary areas near the immediate periphery on adjacent parcels. These areas have been included in the hydrologic analysis. 3.5 Existing Condition Runoff Calculations Attached are HydroCad Hydrologic Models contain calculations for each of the existing drainage areas. A summary of the Pre-Development offsite runoff rates and volumes for the project site are as follows: torim Water IC:IoIH .salon IC:Ireven lon IC:DIan MohawkIIu"du,,' JaITl I Werks IC:DuIT jjc i Pre-Development Runoff Rate Discharge Drainage 1-year 2-year 10-year 50-year 100-year Point Areas (cfs) (cfs) (cfs) (cfs) (cfs) Design Point E2 E2 0.00 0.00 0.00 0.00 0.01 Design Point E3 E3 0.00 0.00 0.00 0.00 0.02 Pre-Development Runoff Volume Discharge Drainage 1-year 2-year 10-year 50-year 100-year Point Areas (ac-ft) (ac-ft) (ac-ft) (ac-ft) (ac-ft) Design Point E2 E2 0.00 0.00 0.00 0.00 0.01 Design Point E3 E3 0.00 0.00 0.00 0.001 0.017 Section 4.0 Proposed Conditions 4.1 Watersheds The proposed project will include development of approximately 1.34 acres of pavement and building area, in addition to surrounding grass/lawn areas, preserved buffers and existing vegetation, and construction of stormwater basins to enhance runoff reduction, quality, and protection of adjacent/downstream areas. The developed portions of the site are entirely internally drained in that 100% of impervious is directed to a stormwater control device which provides runoff reduction, quality, and rate control measures. Other than areas that are left undisturbed the entire developed area is captured and conveyed on site to the stormwater mitgation provided. The proposed project will primarily utilize sedimentation basins with infiltration as the best management practices to attain runoff reduction, rate control, and water quality treatment required by code. Internally the site is broken into several subcatchments each conveyed to their respective conveyance devices and sedimentation basins prior to being infiltrated. Some undisturbed areas of the site, in particular at the periphery of the developed area proposed, that will have unmodified drainage patterns and continue to replicate existing runoff characteristics and locations. The proposed sedimentation basins capture sediment laden runoff and allow runoff to settle our pollutants and suspended solids prior to infiltration into the subsurface. Year-round infiltration is provided by periodically located drywells. Drywell inlets/grates are elevated above the minimum required WQv storage volume in each basin. The analysis is conservative as it ignores any infiltration attained at the base of the sedimentation basins. Further, for simplicity, the analysis also ignores any supplemental storage volume provided by the individual drywells (this volume is minor in comparison to the basin). The conservative analysis, whereby infiltration is only allowed through the floor of each drywell, resolves any concerns that may arise from frozen ground, since the base of the drywells is below the frost line. The post-development watershed subareas are shown in the attached Post Development Drainage Map SW-2. Areas P1 and P4 include 100% of the developed portion of the site and capture/attenuate all storm events with no discharge offsite. There are two offsite discharge torim Water IC:IoIH .salon IC:Ireventon IC:DIan MohawkIIu"du,,;tiJai II Werks IC:DuIT jjc i points of interest utilized for the developed conditions calculations for the project, which mimic existing conditions for undisturbed areas; - P2— Existing undisturbed area 2 which discharges offsite to the north. - P3— Existing undisturbed area 3 which discharges offsite to the south. A summary of the Post-Development runoff rates and volumes for the project site are as follows: Post-Development Discharge Rates Discharge Drainage 1-year 2-year 10-year 50-year 100-year Point Areas (cfs) (cfs) (cfs) (cfs) (cfs) Design Point P2 P2 0.00 0.00 0.00 0.00 0.01 Design Point P3 P3 0.00 0.00 0.00 0.00 0.005 Post-Development Runoff Volume Discharge Drainage 1-year 2-year 10-year 50-year 100-year Point Areas (ac-ft) (ac-ft) (ac-ft) (ac-ft) (ac-ft) Design Point P2 P2 0.00 0.00 0.00 0.00 0.01 Design Point P3 P3 0.00 0.00 0.00 0.00 0.011 Section 5.0 Stormwater Management Plan NYSDEC Stormwater Management Design Manual presents a unified approach for sizing stormwater management practices to meet pollutant removal goals, reduce channel erosion, prevent overbank flooding, and to help control extreme flooding. The components of this approach are; • Meet or exceed Water Quailty Volume requirements (WQv) • Meet or exceed Runoff Reduction Volume requirements (RRv) • Meet or exceed requirements for Channel protection Volume (Cpv) • Meet or exceed requirements for Overbank Flood Control (Qp) • Meet or exceed requirements for Extreme Storm Control (Qf) To properly apply these criteria and control measures, the site has been divided into sub- watersheds and each sub-watershed has been analyzed for compliance with these regulations. Each of the requirements for the project is presented in further detail in the following sections. 5.1 Green Infrastructure Green infrastructure planning for a project generally includes provisions that will promote an overall reduction in runoff and the required water quality volume. Typical measures for such practices include, but are not limited to; runoff reduction practices, preservations of undisturbed torim Water IC:IoIH .salon IC:Ireven lon IC:DIan MohawkIIu"du,,;tiJai II Werks IC:DuIT jjc t areas, preservation of buffers and natural resources, reduction in clearing and grading or impervious surfaces, and locating development away from critical or sensitive areas. Techniques utilized for "green infrastructure" on this project and included in the current design are as follows; - Preservation of the natural hydrology is accomplished by providing periphery undisturbed areas which discharge offsite to existing areas mimicking existing conditions. - Naturally forested and vegetated buffers are maintained. - The proposed development follows natural topography of the site with an internally contained gently sloped development area requiring less change to and impact on the overall site. - To promote runoff reduction and water quality improvement we have incorporated the following measures; impervious area reduction (stone areas which allow storage and infiltration around the building), preservation of existing forest, landscaping, infiltration practices for substantial runoff reduction, and water quality treatment through a series of grass strips and sedimentation basins. - Developing the project in a designated area with municipal services available which is also intended for dense industrial development thereby reducing impacts which may result in other more sensitive locations within the Town. By analysis and planning to include the above measures and practices, we have achieved the general goals and intent of the green infrastructure planning requirements of the NYSDEC Stormwater Design Manual. 5.2 Water Quality The Water Quality Volume is designed to improve water quality sizing to capture and treat 90 percent of the average annual stormwater runoff volume. WQv is directly related to the amount of impervious cover created on the site. NYSDEC Figure 4.1 provides the 90% rainfall event amount (P) used for this region to be used in the WQv calculation. For this project site location the determined P is 1.2 inches of precipitation. The following equation has been used to determine water quality volumes for the project: WQv = [(P) (Rv) (A)] /12 Where: Rv=0.05+0.009(1) 1=Impervious Cover (%) P=1.2 Calculations for water quality are included in the appendices. Water quality treatment has been achieved on site by using best management practices including; runoff reduction and pretreatment using sedimentation basins. Sedimentation basins will both pre-treat the stormwater runoff and provided water quality volume in order to deplete pollutant and sediment loads in runoff. These stormwater treatment techniques will provide the highest possible level of treatment of the stormwater for the site and protect subsequent drainage systems and the down gradient wetlands or other waterbodies from stormwater pollutants. torim Water IC:I IIIIa.sflon IC:Irevenflon IC:DIan MohawkIIu"du,,;tiJai II Werks IC:DuIT jjc t The proposed practices have been designed with the following parameters; minimum three feet of separation to the seasonal high groundwater elevation for infiltration practices, the basin shall fully dewater the entire WQv within 48 hours (See HydroCad Hydrologic Models for detention time), the sedimentation basins provide pre-treatment storage for 100% of the required WQv for infiltration practices, and the drywells provide runoff reduction of 100% of the required WQv. Calculations (See HydroCad Hydrologic Models and appendices) illustrate the satisfaction of the WQv analysis. 5.3 Runoff Reduction Volume Runoff reduction from proposed development and impervious areas of the total Water Quality Volume is achieved on site, thus this requirement has been met. 5.4 Peak Flow and Volume Attenuation Stream Channel Protection Volume (Cpv) requirements are designed to protect stream channels downstream from erosion. This is accomplished by providing 24-hour extended detention of the 1-year, 24-hour storm event. The two conditions where the Cpv requirement does not apply include: reduction of the entire Cpv volume is achieved at a site through green infrastructure or infiltration systems; and the site discharges directly tidal waters or fifth order (fifth downstream) or larger streams. Precipitation for the 1-year storm at this site location is 2.1 inches. The Cpv analysis indicated that 100% of the Cpv storm event is infiltrated on site, thus this requirement has been met. See attached HydroCad Hydrologic Models for calculations. Overbank Flood (Qp) control sizing criteria is to prevent an increase in the frequency and magnitude of out-of-bank flooding generated by urban development. Overbank control requires onsite storage to attenuate the post-development 10-year, 24-hour peak discharge rate (Qp) to less than pre-development rates. Since the10-year peak runoff rates for the post-development conditions are less than the peak pre-development rates, this requirement has been satisfied. See attached HydroCad Hydrologic Models for calculations. Extreme Flood Control Criteria (Qf) requirements are designed to prevent the increased risk of flood damage from large storm events and to maintain the boundary of the pre-development 100-year flood plain. The 100-year extreme flood control is accomplished by providing storage on site to attenuate the post-development 100-year, 24-hour peak discharge rate (Qf) to less than pre-development rates. Since the peak runoff rates for the post-development conditions are less than the peak pre-development rates, this requirement has been satisfied. See attached HydroCad Hydrologic Models for calculations. The Town of Queensbury stormwater regulations require rate attenuation of the 50-year design storm event. The 50-year design storm attenuation is accomplished by providing storage on site to attenuate the post-development 50-year, 24-hour peak discharge rate to less than pre- development rates. Since the peak runoff rates for the post-development conditions are less torim Water IC:I IIIIa.sflon IC:Irevenflon IC:DIan MohawkIIu"du,,;tiJai II Werks IC:DuIT jjc t than the peak pre-development rates, this requirement has been satisfied. See attached HydroCad Hydrologic Models for calculations. The Town of Queensbury stormwater regulations require volume attenuation of the 50-year design storm event. The 50-year design storm attenuation is accomplished by providing storage and/or infiltration on site to attenuate the post-development 50-year, 24-hour discharge volume to less than pre-development volumes. Calculations for each watershed on the site were analyzed for the 50-year storm using a precipitation of 4.9 inches. Since the runoff volumes for the post-development conditions are less than the pre-development volumes, this requirement has been satisfied. See attached HydroCad Hydrologic Models for calculations. 5.5 Operations and Maintenance Plan To ensure continuous and effective operation of the Stormwater Management practices, scheduled inspections and maintenance of the implemented practices will be completed periodically by the project Owner. Basins and conveyance devices will be properly maintained through periodic inspection, cleaning, repairs, vegetative re-stabilization, and seeding of bare areas. Drywells and sedimentation basins will be kept clean and any waste present will be handled and disposed of appropriately. Additionally the proposed practices and devices will have direct accessibility for any repair or rehabilitation necessary in the future. Section 6.0 Conclusion After analysis of the existing site conditions, soils and natural drainage patterns, the proposed site design improvements will function to utilize existing soils, preserve natural drainage patterns, disconnect impervious flow and attenuate the peak runoff rate for the 1-year, 2-year, 10-year, 50-year, and 100-year storm events. The project utilizes low impact development techniques to reduce stormwater impacts from the newly created impervious areas and uses best management practices to reduce, treat and control stormwater runoff at the source. The stormwater control devices proposed for the project will maintain the post-development runoff rates to pre-development conditions and the project is anticipated to have no adverse impact on downstream drainage areas or adjoining properties. The proposed stormwater measures will provide the required stormwater runoff reduction, treatment and control measures necessary to have a minimal impact on adjacent properties, existing drainage systems and provide good protection of downstream water quality. PART II Section 7.0 Stormwater Pollution Prevention Plan Controlling sediment laden runoff transport from being discharged off site is an important aspect of the construction planning process. Erosion and sediment control practices are necessary to prevent or minimize the extent of erosion on site during construction activities, as well minimize torim Water IC:IoIH .salon IC:Ireven lon IC:DIan MohawkIIu"du,,;tiJai II Werks IC:DuIT jjc t or prevent the transport of sediment laden runoff to nearby streams and/or wetlands. NYSDEC regulates construction activities that plan to disturb greater than 1 acre. A permit is required to be obtained from the Department for this project prior to the start of construction operations on site by the Contractor. The following sections are provided to ensure that necessary procedures and the requirements of the permit are followed. 7.1 Pollution Prevention Practices Certain measures are required to prevent contaminants from becoming pollutant sources in stormwater discharge. Construction activities increase the amount of onsite chemicals, debris, and litter which need to be controlled to reduce potential pollutant sources. To prevent such sources, areas will be designated for refuse and recycling storage. When necessary, the materials will be handled and disposed of appropriately. Additionally, any debris accumulated due to construction activity will be recycled or disposed of in the same manner. Onsite handling and disposal of construction chemicals will be completed by qualified personnel to ensure the prevention of pollutant sources in stormwater discharge and the safety of the construction site. Section 8.0 Erosion and Sediment Control Practices Erosion and sediment control practices are proposed to be implemented for the project and are shown on the site plans. Details have been provided for various erosion and sediment control practices, and the site operator is responsible to ensure their proper installation and implementation. The following temporary erosion and sediment measures will be utilized for this site: Sediment Control Fence: Silt fence shall be used to control erosion from sheet flow on slopes not to exceed 3 on 1. Concentrated flows shall not be directed toward the silt fence. The silt fence must be installed parallel to the contour lines to eliminate drainage along the fence. Temporary Sediment Trap: Basins will be excavated and provided as shown on plans. Temporary sediment basins shall be seeded with ryegrass to accept stormwater runoff from the construction site allowing sediment to settle out. Sediment Traps will be constructed in the location and be of the size and type specified to collect sediment laden stormwater. Temporary Seeding: Land that is stripped of vegetation will be seeded and planted as soon as possible. Any area that will remain cleared but not under construction for 10 days or longer will be seeded with a ryegrass mixture and mulched to stabilize soil until construction resumes. Temporary Diversion Swales: Temporary diversion swales shall be constructed either to divert clean stormwater runoff from newly graded areas or to direct sediment laden runoff to a sediment trapping device. torim Water IC:IoIH .salon IC:Ireventon IC:DIan MohawkIIu"du,,;tiJai II Werks IC:DuIT jjc t Channel Stabilization: Drainage channels and temporary diversion swales shall be stabilized with seed, erosion control netting or riprap, as specified, to minimize deterioration of the channel bed. Stone Check Dams constructed of #2 stone shall be installed in the channels as necessary (heel to toe along the channel slope) to trap sediment and reduce channel velocity. Stabilized Construction Entrance: Entrance roads will be protected by installation of a crushed stone blanket for cleaning construction vehicle wheels. Blankets shall be placed at any intersection of a construction road with a paved or publicly owned road. Stabilized construction entrances shall be installed as necessary. Dust Control: Measures for dust control during construction shall be implemented as needed (daily water sprays will be used during dry conditions. In addition to water sprays, temporary mulching, temporary seeding and covering stockpiles with tarps shall be implemented when necessary. Erosion Control Blanket: Fabricated straw or biodegradeable mesh blankets shall be utilized to protect and temporarily stabilize slopes of 3:1 or greater (or flatter slopes in highly erodeable soils). Apply to graded, topsoiled, and seeded slopes. Attach blankets with staples or stakes in accordance with manufacturer's recommendations. Maintain blankets in place until permanent groundcover is firmly established. Flexible Channel Liner: Fabricated coconut nylon-fiber mesh blankets shall be utilized to protect and temporarily stabilize any final drainage channels where runoff is concentrated. Apply to graded, topsoiled, and seeded channels. Attach liner with staples or stakes in accordance with manufacturer's recommendations. Maintain liner in place until permanent groundcover is firmly established. (see "Channel Stabilization" above) Rock Check Dam: Small stone check dams shall be constructed in any temporary drainage channels during construction. These dams shall be constructed in the locations shown on the plans and as necessary to control any drainage from the construction site which concentrates in flow paths or channels. Dams shall be constructed as detailed on the Erosion and Sediment Control Plan. Dams shall be cleaned of any sediment after each rainfall as needed. Rock Outlet Protection: Rock and/or stone liners shall be installed at all outlet devices where concentrated flow occurs. Outlet protection shall serve to reduce velocity or energy of discharged runoff and protect channel from erosion. All outlet protection measures shall be installed as indicted on the drawings. Inlet Protection: Perimeter silt fence or stone inlet protection shall be installed at all inlet points for subsurface devices where concentrated flow occurs. Inlet protection shall serve to reduce velocity or energy of discharged runoff and protect subsurface structures from sediment laden runoff from entering the device. All inlet protection measures shall be installed as indicted on the drawings. torim Water IC:IoIH .salon IC:Ireven lon IC:DIan MohawkIIu"du,,;tiJai II Werks IC:DuIT jjc t Section 9.0 Construction Procedures and Phasing 9.1 Requirements Prior to Construction At the start of construction the Contractor shall ensure all necessary permits and/or approvals have been obtained. The site operator shall review all requirements of the SWPPP and permit. The Notice of Intent shall be updated if necessary and submitted to NYSDEC for permit coverage. 9.2 Construction Phasing and Sequence At the start of construction all required postings, silt fence, and the construction entrance shall be installed. Planned staging areas shall be cleared and covered with 6 inches of #2 crushed stone. Once the site has been prepared for start of work, the site operator shall request initial site inspection by Engineer for certification prior to commencing site disturbance activities. Upon certification, the Contractor shall begin rough grading and clearing operations for the proposed driveway and building area while limiting the area of disturbance to the greatest extent practical during construction. The total approximate disturbance for the site is 2.3 acres. Topsoil and/or organic material shall be stripped and site grubbed in preparation for rough grading and filling/cutting as necessary. This material shall be stockpiled as shown on drawings and retained for later use. The temporary sediment trap and diversion swales shall be installed at the earliest possible stage of construction. Provide sediment trap outlet as specified on the plans. Provide localized erosion and sediment control measures where required for isolated work. After rough grading and clearing for the driveway and buildings, the Contractor shall prepare the site for utility installation and permanent stormwater measures. All driving surfaces, channels, and stormwater devices shall be rough graded and subbase installation should be scheduled after installation of all utilities. The area of stormwater basins shall be graded, topsoiled, seeded and mulched. All installed stormwater devices shall be protected at all times from sediment laden runoff. All disturbed areas shall be protected from erosion and routinely inspected for deficiencies by the site operator. Corrective measures shall be implemented as soon as possible when necessary. After the site is stabilized, the sedimentation basins and conveyance devices shall be cleaned out and final grades established as shown on the Stormwater and Grading Plan. Section 10.0 Maintenance Requirements 10.1 Maintenance of Temporary Erosion and Sediment Control Devices The sediment traps shall be inspected by the Contractor at least weekly and after every rain event exceeding 0.5-inches of precipitation. When 50% of the volume of each device is full, the Contractor shall remove collected sediment and dispose of properly. Outlet devices from traps torim terIC:I IIdHu lon IC:Ireven lon IC:DIan MohawkIIu"du,,;tiJai II Werks IC:DuIT jjc t shall be maintained in a clean condition for proper draining of the basin. The Contractor shall inspect the sediment control fence, construction entrance, inlet protection measures, and rock check dams weekly and after every rain event and remove trapped sediment and maintain the devices in good working order. The site operator shall inspect and evaluate the erosion and sediment control procedures weekly. Deficiencies in protection measures shall be corrected, or an alternative or additional device shall be utilized, when necessary to further mitigate erosion or sedimentation of runoff. 10.3 Permanent Erosion Control All previous disturbed areas shall be graded, topsoiled, and seeded or planted as soon as practical. Seed beds shall be mulched with straw or hydro-mulch with tackifier and plant beds shall be mulched with pine bark mulch. Seeded areas on slopes over 3:1 shall be stabilized with erosion control netting as specified on the plans. 10.4 Permanent Stormwater Device Maintenance Maintenance of stormwater management practices is integral to the continued satisfactory function of the devices to provide the required treatment and flow attenuation as designed. Sediment shall be removed every two to three years or after 25 % of the total capacity of the sedimentation basin has been lost. At no time should the level of collected sediment reach the inlet elevation of subsurface devices. Additionally, the condition of steep slopes or embankments, devices, and access grates shall be inspected yearly and following major storm events for erosion and/or debris blockages. Corrective measures shall be implemented immediately for deficient conditions found to exist. Site plan drawing details provide detailed maintenance requirements for each practice utilized. Site plan drawings and details provide additional maintenance requirements for each device. Section 11.0 SWPPP Inspection Requirements 11.1 General Construction Site Inspection and Maintenance Requirements The owner or operator must ensure that all erosion and sediment control practices (including pollution prevention measures) and all post-construction stormwater management practices identified in the SWPPP are inspected and maintained in accordance with Part IV.B. and C. of the SWPPP permit. The terms of the SWPPP permit shall not be construed to prohibit the State of New York from exercising any authority pursuant to the ECL, common law or federal law, or prohibit New York State from taking any measures, whether civil or criminal, to prevent violations of the laws of the State of New York, or protect the public health and safety and/or the environment. 11.2 Contractor Maintenance Inspection Requirements The owner or operator of each construction activity shall have a trained contractor inspect the erosion and sediment control practices and pollution prevention measures being implemented torim terIC:I IIdHu lon IC:Ireven lon IC:DIan MohawkIIu"du,,;tilai II Werks IC:DuIT jjc t within the active work area daily to ensure that they are being maintained in effective operating condition at all times. If deficiencies are identified, the contractor shall begin implementing corrective actions within one business day and shall complete the corrective actions in a reasonable time frame. For construction sites where soil disturbance activities have been temporarily suspended (e.g. winter shutdown) and temporary stabilization measures have been applied to all disturbed areas, the trained contractor can stop conducting the maintenance inspections. The trained contractor shall begin conducting the maintenance inspections in accordance with Part IV.B.1. of the SWPPP permit as soon as soil disturbance activities resume. For construction sites where soil disturbance activities have been shut down with partial project completion, the trained contractor can stop conducting the maintenance inspections if all areas disturbed as of the project shutdown date have achieved final stabilization and all post- construction stormwater management practices required for the completed portion of the project have been constructed in conformance with the SWPPP and are operational. 11.3 Qualified Inspector Inspection Requirements The owner or operator shall have a qualified inspector conduct site inspections in conformance with the following requirements: (Note: The trained contractor identified in Part III.A.6. and W.B. of the SWPPP permit cannot conduct the qualified inspector site inspections unless they meet the qualified inspector qualifications. In order to perform these inspections, the trained contractor would have to be a: - Licensed Professional Engineer, - Certified Professional in Erosion and Sediment Control (CPESC), - Registered Landscape Architect, or - someone working under the direct supervision of, and at the same company as, the licensed Professional Engineer or Registered Landscape Architect, provided they have received four (4) hours of Department endorsed training in proper erosion and sediment control principles from a Soil and Water Conservation District, or other Department endorsed entity]. A qualified inspector shall conduct site inspections for all construction activities identified in the SWPPP. Unless otherwise notified by the Department, the qualified inspector shall conduct site inspections in accordance with the following timetable: a. For construction sites where soil disturbance activities are on-going, the qualified inspector shall conduct a site inspection at least once every seven (7) calendar days. b. For construction sites where soil disturbance activities are on-going and the owner or operator has received authorization in accordance with Part I I.C.3 to disturb greater than five (5) acres of soil at any one time, the qualified inspector shall conduct at least two (2) site inspections every seven (7) calendar days. The two (2) inspections shall be separated by a minimum of two (2) full calendar days. c. For construction sites where soil disturbance activities have been temporarily suspended (e.g. winter shutdown) and temporary stabilization measures have been applied to all disturbed areas, the qualified inspector shall conduct a site inspection at least once every thirty (30) calendar days. The owner or operator shall notify the DOW (SPDES) Program contact at the Regional Office or, in areas under the jurisdiction of a regulated, traditional land use control MS4, the regulated, traditional land use control MS4 (provided the regulated, traditional land use torim terIC:I IIdHu lon IC:Ireven lon IC:DIan MohawkIIu"du,,;tilai II Werks IC:DuIT jjc t control MS4 is not the owner or operator of the construction activity) in writing prior to reducing the frequency of inspections. d. For construction sites where soil disturbance activities have been shut down with partial project completion, the qualified inspector can stop conducting inspections if all areas disturbed as of the project shutdown date have achieved final stabilization and all post-construction stormwater management practices required for the completed portion of the project have been constructed in conformance with the SWPPP and are operational. The owner or operator shall notify the DOW (SPDES) Program contact at the Regional Office or, in areas under the jurisdiction of a regulated, traditional land use control MS4, the regulated, traditional land use control MS4 (provided the regulated, traditional land use control MS4 is not the owner or operator of the construction activity) in writing prior to the shutdown. If soil disturbance activities are not resumed within 2 years from the date of shutdown, the owner or operator shall have the qualified inspector perform a final inspection and certify that all disturbed areas have achieved final stabilization, and all temporary, structural erosion and sediment control measures have been removed; and that all post-construction stormwater management practices have been constructed in conformance with the SWPPP by signing the "Final Stabilization" and "Post- Construction Stormwater Management Practice" certification statements on the NOT. The owner or operator shall then submit the completed NOT form to the address in Part I I.A.1 of the SWPPP permit. e. For construction sites that directly discharge to one of the 303(d) segments listed in Appendix E of the SWPPP permit or is located in one of the watersheds listed in Appendix C of the SWPPP permit, the qualified inspector shall conduct at least two (2) site inspections every seven (7) calendar days. The two (2) inspections shall be separated by a minimum of two (2) full calendar days. At a minimum, the qualified inspector shall inspect all erosion and sediment control practices and pollution prevention measures to ensure integrity and effectiveness, all post-construction stormwater management practices under construction to ensure that they are constructed in conformance with the SWPPP, all areas of disturbance that have not achieved final stabilization, all points of discharge to natural surface waterbodies located within, or immediately adjacent to, the property boundaries of the construction site, and all points of discharge from the construction site. The qualified inspector shall prepare an inspection report subsequent to each and every inspection. At a minimum, the inspection report shall include and/or address the following: a. Date and time of inspection; b. Name and title of person(s) performing inspection; c. A description of the weather and soil conditions (e.g. dry, wet, saturated) at the time of the inspection; d. A description of the condition of the runoff at all points of discharge from the construction site. This shall include identification of any discharges of sediment from the construction site. Include discharges from conveyance systems (i.e. pipes, culverts, ditches, etc.) and overland flow; e. A description of the condition of all natural surface waterbodies located within, or immediately adjacent to, the property boundaries of the construction site which receive runoff from disturbed areas. This shall include identification of any discharges of sediment to the surface waterbody; f. Identification of all erosion and sediment control practices and pollution prevention measures that need repair or maintenance; g. Identification of all erosion and sediment control practices and pollution prevention measures that were not installed properly or are not functioning as designed and need to be reinstalled or replaced; torim terIC:I IIdHu lon IC:Ireven lon IC:DIan MohawkIIu"du,,;tilai II Werks IC:DuIT jjc t h. Description and sketch of areas with active soil disturbance activity, areas that have been disturbed but are inactive at the time of the inspection, and areas that have been stabilized (temporary and/or final) since the last inspection; i. Current phase of construction of all post-construction stormwater management practices and identification of all construction that is not in conformance with the SWPPP and technical standards; j. Corrective action(s) that must be taken to install, repair, replace or maintain erosion and sediment control practices and pollution prevention measures; and to correct deficiencies identified with the construction of the post-construction stormwater management practice(s); k. Identification and status of all corrective actions that were required by previous inspection; and I. Digital photographs, with date stamp, that clearly show the condition of all practices that have been identified as needing corrective actions. The qualified inspector shall attach paper color copies of the digital photographs to the inspection report being maintained onsite within seven (7) calendar days of the date of the inspection. The qualified inspector shall also take digital photographs, with date stamp, that clearly show the condition of the practice(s) after the corrective action has been completed. The qualified inspector shall attach paper color copies of the digital photographs to the inspection report that documents the completion of the corrective action work within seven (7) calendar days of that inspection. Within one business day of the completion of an inspection, the qualified inspector shall notify the owner or operator and appropriate contractor or subcontractor identified in Part I I I.A.6. of the SWPPP permit of any corrective actions that need to be taken. The contractor or subcontractor shall begin implementing the corrective actions within one business day of this notification and shall complete the corrective actions in a reasonable time frame. All inspection reports shall be signed by the qualified inspector. Pursuant to Part II.C.2. of the SWPPP permit, the inspection reports shall be maintained on site with the SWPPP. SWPPP CERTIFICATIONS CONTRACTOR/OPERATOR CERTIFICATION MS4 SWPPP ACCEPTANCE FORM NIE Y RK Department Cf sTAITr or OPPORTUNITY Environmental Conservation NYS Department of Environmental Conservation Division of Water 625 Broadway, 4th Floor Albany, New York 12233-3505 MS4 Stormwater Pollution Prevention Plan (SWPPP) Acceptance Form for Construction Activities Seeking Authorization Under SPDES General Permit *(NOTE: Attach Completed Form to Notice Of Intent and Submit to Address Above) I. Project Owner/Operator Information 1. Owner/Operator Name: 140 CAREY ROAD LLC 2. Contact Person: BILL BRANDT 3. Street Address: 60 RAILROAD PLACE STE 502 4. City/State/zip: SARATOGA SPRINGS, NY 12866 II. Project Site Information 5. Project/Site Name: MOHAWK INDUSTRIAL WERKS 6. Street Address: 140 CAREY ROAD 7. City/State/zip: QUEENSBURY, NY 12804 III. Stormwater Pollution Prevention Plan (SWPPP) Review and Acceptance Information 8. SWPPP Reviewed by: 9. Title/Position: 10. Date Final SWPPP Reviewed and Accepted: IV. Regulated MS4 Information 11. Name of MS4: TOWN OF QUEENSBURY 12. MS4 SPDES Permit Identification Number: NYR20A 13. Contact Person: STORMWATER MANAGEMENT OFFICER 14. Street Address: 742 BAY ROAD 15. City/State/Zip: QUEENSBURY, NY 12804 16. Telephone Number: Page 1 of 2 MS4 SWPPP Acceptance Form - continued V. Certification Statement-MS4 Official (principal executive officer or ranking elected official) or Duly Authorized Representative I hereby certify that the final Stormwater Pollution Prevention Plan (SWPPP)for the construction project identified in question 5 has been reviewed and meets the substantive requirements in the SPDES General Permit For Stormwater Discharges from Municipal Separate Storm Sewer Systems (MS4s). Note: The MS4, through the acceptance of the SWPPP, assumes no responsibility for the accuracy and adequacy of the design included in the SWPPP. In addition, review and acceptance of the SWPPP by the MS4 does not relieve the owner/operator or their SWPPP preparer of responsibility or liability for errors or omissions in the plan. Printed Name: Title/Position: Signature: Date: VI.Additional Information (NYS DEC- MS4 SWPPP Acceptance Form -January 2015) Page 2 of 2 INE RK Department of STA Opp TY Environmental Conservation SWPPP Preparer Certification Form SPDES General Permit for Stormwater Discharges From Construction Activity (GP-0-15-002) RrcJec-t Site Project/Site Name MOHAWK INDUSTRIAL WERKS Owner/Operator (Company Name/Private Owner/Municipality Name) 140 CAREY ROAD LLC Stat&ni&nit SWRRP Illi iiirellllarer I hereby certify that the Stormwater Pollution Prevention Plan (SWPPP) for this project has been prepared in accordance with the terms and conditions of the GP-0-15-002. Furthermore, I understand that certifying false, incorrect or inaccurate information is a violation of this permit and the laws of the State of New York and could subject me to criminal, civil and/or administrative proceedings. DANIEL RYAN, P.E. First name MI Last Name Signature Date Revised:April 2015 YDepartment STATE OF OPPORTUNITYEnvironmental Conservation Owner/Operator Certification Form SPDES General Permit For Stormwater Discharges From Construction Activity (GP-0-15-002) Project/Site Name: MOHAWK INDUSTRIAL WERKS eNO1 Submission Number: TBD eNO1 Submitted by: ❑ Owner/Operator SWPPP Preparer Other Certification Statement - Owner/Operator I have read or been advised of the permit conditions and believe that I understand them. I also understand that, under the terms of the permit, there may be reporting requirements. I hereby certify that this document and the corresponding documents were prepared under my direction or supervision. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. I further understand that coverage under the general permit will be identified in the acknowledgment that I will receive as a result of submitting this NOI and can be as long as sixty (60) business days as provided for in the general permit. I also understand that, by submitting this N01, I am acknowledging that the SWPPP has been developed and will be implemented as the first element of construction, and agreeing to comply with all the terms and conditions of the general permit for which this NOI is being submitted. Owner/Operator First Name M.1. Last Name Signature Date OWNER/OPERATOR SWPPP IMPLEMENTATION FORM PROJECT/SITE: MOHAWK INDUSTRIAL WERKS Prior to the commencement of construction activity, the owner or operator must identify the contractor(s) and subcontractor(s) that will be responsible for installing, constructing, repairing, replacing, inspecting and maintaining the erosion and sediment control practices included in the SWPPP; and the contractor(s) and subcontractor(s) that will be responsible for constructing the post-construction stormwater management practices included in the SWPPP. The owner or operator shall have each of the contractors and subcontractors identify at least one person from their company that will be responsible for implementation of the SWPPP. This person shall be known as the trained contractor. The owner or operator shall ensure that at least one trained contractor is on site on a daily basis when soil disturbance activities are being performed. E&S Installinq and Constructinq Contractor Contractor/Company Name: TBD Responsible Person (Trained Contractor): TBD Address: Contact Phone #: E&S Repairing, Replacing, Inspecting, Maintaining Contractor Contractor/Company Name: TBD Responsible Person (Trained Contractor): TBD Address: Contact Phone #: The contractor(s) and subcontractor(s) that will be responsible for constructing the post-construction stormwater management practices included in the SWPPP. Post-Construction SW Management Practice Installing and Constructing Contractor Contractor/Company Name: TBD Responsible Person (Trained Contractor): TBD Address: Contact Phone #: The owner or operator shall have each of the contractors and subcontractors identified above sign a copy of the following certification statement below before they commence any construction activity: "1 hereby certify under penalty of law that 1 understand and agree to comply with the terms and conditions of the SWPPP and agree to implement any corrective actions identified by the qualified inspector during a site inspection. 1 also understand that the owner or operator must comply with the terms and conditions of the most current version of the New York State Pollutant Discharge Elimination System ("SPDES') general permit for stormwater discharges from construction activities and that it is unlawful for any person to cause or contribute to a violation of water quality standards. Furthermore, 1 am aware that there are significant penalties for submitting false information that 1 do not believe to be true, including the possibility of fine and imprisonment for knowing violations." In addition to providing the certification statement above, the certification page must also identify the specific elements of the SWPPP that each contractor and subcontractor will be responsible for and include the name and title of the person providing the signature; the name and title of the trained contractor responsible for SWPPP implementation; the name, address and telephone number of the contracting firm; the address (or other identifying description) of the site; and the date the certification statement is signed. The owner or operator shall attach the certification statement(s) to the copy of the SWPPP that is maintained at the construction site. If new or additional contractors are hired to implement measures identified in the SWPPP after construction has commenced, they must also sign the certification statement and provide the information listed above. E&S Installing and Constructing Contractor Responsible Person (Trained Contractor): TBD Signature: Date: I am responsible for the following items/SWPPP components; All SWPPP items noted in the SWPPP report and on Construction Drawings. E&S Repairing, Replacing, Inspecting, Maintaining Contractor Responsible Person (Trained Contractor): Signature: Date: I am responsible for the following items/SWPPP components; All SWPPP items noted in the SWPPP report and on Construction Drawings. Post-Construction SW Management Practice Installing and Constructing Contractor Responsible Person (Trained Contractor): Signature: Date: I am responsible for the following items/SWPPP components; All SWPPP items noted in the SWPPP report and on Construction Drawings Other Contractor Company Name: Company Address/Phone # Responsible Person (Trained Contractor): Signature: Date: I am responsible for the following items/SWPPP components; Other Contractor Company Name: Company Address/Phone # Responsible Person (Trained Contractor): Signature: Date: I am responsible for the following items/SWPPP components; Rainfall Data VmS FOR LAKE E ', j YORK Mo d M 7.0 6a F 5_0c 44 s A _ 3_o p �. J, a b 1-J I k g - '0F"91iy, 2 12 4 MINUTES LAKE GEORGE, NEVV YORK oU-S. WEA7HER SUREAU TECHNICAL PAPER , MAY 1 61 rl y NATIONAL C"C'Ee e ANIC AND TMOSPHERIADMINISTRATION T ,,,uqi AL s ? NWS HyFTz, JuNE1977 *3d Figure B-2 Approximate geographic boundaries for NRCS(SCS)rainfall distributions IA t , if v �' )) 1 CI _ 1 % Rainfall 1' Distribution Type Type 2 IA OL © Type II e III r" Rainfall data sources This section lists the most current 24-hour rainfall data Commerce,National Weather Service,NOAA Atlas 2. published by the National Weather Service(NWS)for Silver Spring,MD. various parts of the country.Because NWS Technical Paper 40(TP-40)is out of print,the 24-hour rainfall Alaska maps for areas east of the 105th meridian are included Miller,John F. 1963. Probable maximum precipitation here as figures B-3 through B-8. For the area generally and rainfall-frequency data for Alaska for areas to 400 west of the 105th meridian,TP-40 has been superseded square miles, durations to 24 hours and return periods by NOAA Atlas 2,the Precipitation-Frequency Atlas of from 1 to 100 years. U.S. Dept. of Commerce,Weather the Western United States,published by the National Bur. Tech. Pap.No.47. Washington,DC. 69 p. Ocean and Atmospheric Administration. Hawaii East of 105th meridian Weather Bureau. 1962. Rainfall-frequency atlas of the Hershfield,D.M. 1961. Rainfall frequency atlas of the Hawaiian Islands for areas to 200 square miles, dura- United States for durations from 30 minutes to 24 tions to 24 hours and return periods from 1 to 100 hours and return periods from 1 to 100 years. U.S. years. U.S. Dept. Commerce,Weather Bur.Tech. Pap. Dept. Commerce,Weather Bur. Tech. Pap.No. 40. No. 43. Washington,DC. 60 p. Washington,DC. 155 p. Puerto Rico and Virgin Islands West of 105th meridian Weather Bureau. 1961. Generalized estimates of prob- Miller,J.F.,R.H. Frederick,and R.J.Tracey. 1973. able maximum precipitation and rainfall-frequency Precipitation-frequency atlas of the Western United data for Puerto Rico and Virgin Islands for areas to 400 States.Vol. I Montana;Vol. II,Wyoming;Vol III, Colo- square miles, durations to 24 hours,and return periods rado;Vol. IV,New Mexico;Vol V,Idaho;Vol.VI,Utah; from 1 to 100 years. U.S. Dept. Commerce,Weather Vol.VII,Nevada;Vol.VIII,Arizona;Vol. IX,Washing- Bur. Tech. Pap.No.42. Washington,DC. 94 P. ton;Vol.X, Oregon;Vol.XI,California. U.S.Dept. of B-2 (210-VI-TR-55,Second Ed.,June 1986) Figure B-3 2-year,24-hr rainfall U.S.DEPARTMENT OF AGRICULTURE NATURAL RESOURCES CONSERVATION SERVICE 2-Year 24-Hour Rainfall(inches) 2.0C 7, 1 r' 2.5� " ^l'tilN !,.rr� � .m 2.0 �`� `�., I •5�� I r� Im"N,INI r N " w rC� 1 J3.0 2.0 � � I m � �� ...�� .. �'%•,. �_.�... � 1� jN"I �N:�:� I It \," "� /'�, W' IRN�i T "• I � f( i I 4, �, 1 7 ar r .N 4.q I yy`'�'JJJ YYYY I 5.0 � �. N IP�� r I;I 77 is5.0 ' + 1 00� „ 5. 3.0 I �` 2.0 3.0 2.5 85 5.5 60 1.5 5.0 Rainfall iso-line " I ----- Rainfall iso-line half unit 6.0 ___Rainfall iso-line(depression) 5.0 I 6.0 4.0 4.5 5.0 5.5 Albers Equal Area Projection Figure B-4 5-year,24-hour rainfall U.S.DEPARTMENT OF AGRICULTURE NATURAL RESOURCES CONSERVATION SERVICE 5-Year 24-Hour Rainfall(inches) ". 3 "�".•.� 25 r^ 2.5 ,.�,,,2 5 Appp / 4 r \ f - P 4.5 - USE IN OAATLAS 2 MAPS OR WES ERN SPATES .- . m, \ // 5 5.5 7. V � law...., ;1/ 6.5 J 8.5 /. l 8 4 4.5 / / 8 7.5 7 3.5 / / 7.5 85 5 / / 7 ____ R'f sol' l 61i./. _ Rainfall iso I' half nit 5.5 --- R'fall iso-I' (d pression) 6 5/ 8 6 0 6,'I 7.5 6.5 Albers Equal Area Projection (210-VI-TR-55,Second Ed.,June 1986) B-3 Figure B-5 10-year,24-hour rainfall U.S.DEPARTMENT OF AGRICULTURE NATURAL RESOURCES CONSERVATION SERVICE 10-Year 24-Hour Rainfall(inches) 7-7 3 r r J „s g r ae` ` 1 � a �y W�/ •USENOAA TLA52 MAPS FOR WES ERN ttATES 3 8 �.S.t 6 3.5 '` asr .yq 10 4 g Ranfall'so-line g r ;- 6 8 Rainfall'so-line half unit 8 Ji -- Rainfall iso-line(depression) 7 8 Albers Equal Area Projection Figure B-6 25-year,24-hour rainfall U.S.DEPARTMENT OF AGRICULTURE NATURAL RESOURCES CONSERVATION SERVICE 25-Year 24-Hour Rainfall(inches) r �� ✓ s ts,. 3.5 .:.. - 5 I a -IISE N AA TLAS 2!MAPS FOR, 3 6 # ...,-.%-A- WES ERNiS`TATE'S q 'Gk, p kt s 8.5 ...... i. � A,0, 4 3.5 12 10 5 10 4 10 Rainfall -line0 11 y S — Rainfall io-line half unit 11 8 b ———Rainfall iso-line(depression) g 8 10 g o Albers Equal Area Projection B-4 (210-VI-TR-55,Second Ed.,June 1986) Figure B-7 50-year,24-hour rainfall U.S.DEPARTMENT OF AGRICULTURE NATURAL RESOURCES CONSERVATION SERVICE 50-Year 24-Hour Rainfall(inches) "-^--�, 4 4.5 1 ..._ ______" f7/t y ,ISE NOAA TLAS 2MA.pS FOR 4 4;5 -.:S ERNSTATES w, " $9 n f 10 i 10 3.5 4 .,..w 13 11 y� 2 0 8 11 12 Rainfall iso-line Rainfall iso-line half unit 10 9 Rainfall iso-line(depression) 10 j 12 10y 11 Albers Equal Area Projection Figure B-8 100-year,24-hour rainfall U.S.DEPARTMENT OF AGRICULTURE NATURAL RESOURCES CONSERVATION SERVICE 100-Year 24-Hour Rainfall(inches) �XCIj --77� 4 s I Ja ,�� I I ') ,USE Nd'' •� %'i r ` ES �J %']• / rq '�y,.,� 1s 1413 ) s7 54 "1.I 12 6 8 ✓"• P 2 13 Ranfall'so-line 113 4 _____ Rainfall'so-line half unit 12 10 I ,•��' ___ Rainfall iso-line(depression) 11 11'. 14 2. 13 Albers Equal Area Projection (210-VI-TR-55,Second Ed.,June 1986) B-5 NRCS Soil Information 3: Soil Map—Warren County, New York (MIR a 606330 606360 606390 606420 606450 606480 606510 60640 606570 43o 1740"N .� fl r� l% N V r r � l �l i i� � Soil Mai ir�ay not he-ualiel at this scale. r v 43o 1733"N 606330 606360 606390 606420 606450 606480 606510 606540 606570 Map Scale:1:1,420 if printed on A landscape(11"x 8.5')sheet. ` Meters N 0 20 40 80 120 Feet 0 50 100 200 300 Map projection:Web Mercator Conermordinates:WGS84 Edge tics:UTM Zone 18N WGS84 USDA Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey Soil Map—Warren County, New York (MIR MAP LEGEND MAP INFORM, Area of Interest(AOI) Spoil Area The soil surveys that comprise your AO Area of Interest(AOI) 1:15,800. Stony Spot Soils 4Very Stony Spot Warning:Soil Map may not be valid at t I Soil Map Unit Polygons Wet Spot Enlargement of maps beyond the scale 0,,,0II Soil Map Unit Lines misunderstanding of the detail of mappi ® Soil Map Unit Points Other line placement.The maps do not show Special Line Features contrasting soils that could have been Special Point Features scale. Blowout Water Features Streams and Canals Please rely on the bar scale on each m Borrow Pit measurements. Transportation Clay Spot Rails Source of Map: Natural Resources C( (f Web Soil Survey UR Closed Depression L: ,o Interstate Highways Coordinate System: Web Mercator(E Gravel Pit US Routes Maps from the Web Soil Survey are bw ,AII Gravelly Spot Major Roads projection,which preserves direction ar distance and area.A projection that pre Landfill Local Roads Albers equal-area conic projection,sho Lava Flow Background accurate calculations of distance or are Marsh or swampAerial Photography This product is generated from the USE is of the version date(s)listed below. JAL Mine or Quarry Soil Survey Area: Warren County, Nei Miscellaneous Water Survey Area Data: Version 16, Sep 2� Perennial Water Soil map units are labeled(as space all Rock Outcrop 1:50,000 or larger. Saline Spot Date(s)aerial images were photograph 11,2010 Sandy Spot The orthophoto or other base map on% Severely Eroded Spot compiled and digitized probably differs imagery displayed on these maps.As a Sinkhole shifting of map unit boundaries may be Slide or Slip 0o Sodic Spot USDA Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey Soil Map—Warren County, New York MIW Map Unit Legend Warren County,New York(NY113) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI OaA Oakville loamy fine sand,0 to 7.0 100.0% 3 percent slopes Totals for Area of Interest 7.0 100.0% USIA Natural Resources Web Soil Survey 3/4/2017 Conservation Service National Cooperative Soil Survey Page 3 of 3 Hydrologic Soil Groups Warren County, New York December 2012 [This table of hydrologic soil group data will be updated on eFOTG as needed, in order to maintain consistency with the official SSURGO Map Unit Map Unit Name Component Na Symbol AgA Agawam fine sandy loam, 0 to 3 percent slopes Agawam BaA Belgrade silt loam, 0 to 3 percent slopes Belgrade BaB Belgrade silt loam, 3 to 8 percent slopes Belgrade BcB Bice fine sandy loam, 3 to 8 percent slopes Bice BcC Bice fine sandy loam, 8 to 15 percent slopes Bice BcD Bice fine sandy loam, 15 to 25 percent slopes Bice BdC Bice very bouldery fine sandy loam, sloping Bice BdE Bice very bouldery fine sandy loam, steep Bice BeC Bice-Woodstock very bouldery fine sandy loams, sloping Bice BeC Bice-Woodstock very bouldery fine sandy loams, sloping Woodstock BeE Bice-Woodstock very bouldery fine sandy loams, steep Bice BeE Bice-Woodstock very bouldery fine sandy loams, steep Woodstock Ca Carlisle muck Carlisle Ce Castile gravelly fine sandy loam Castile Cg Cathro and Greenwood mucks Cathro Cg Cathro and Greenwood mucks Greenwood ChB Charlton fine sandy loam, 3 to 8 percent slopes Charlton ChC Charlton fine sandy loam, 8 to 15 percent slopes Charlton ChD Charlton fine sandy loam, 15 to 25 percent slopes Charlton Du Dumps, mine Dumps EIB Elmridge fine sandy loam, 3 to 8 percent slopes Elmridge En Elnora loamy fine sand Elnora FaB Farmington loam, 0 to 8 percent slopes Farmington FrC Farmington loam, very rocky, 3 to 15 percent slopes Farmington Fu Fluvaquents-Udifluvents complex, frequently flooded Fluvaquents Fu Fluvaquents-Udifluvents complex, frequently flooded Udifluvents GaB Galway loam, 3 to 8 percent slopes Galway HaB Hartland very fine sandy loam, 3 to 8 percent slopes Hartland HaC Hartland very fine sandy loam, 8 to 15 percent slopes Hartland HeC Hermon very bouldery fine sandy loam, sloping Hermon HeE Hermon very bouldery fine sandy loam, steep Hermon HmC Hermon-Lyman-Rock outcrop complex, sloping Hermon HmC Hermon-Lyman-Rock outcrop complex, sloping Lyman HmC Hermon-Lyman-Rock outcrop complex, sloping Rock outcrop Map Unit Map Unit Name Component Na Symbol HmE Hermon-Lyman-Rock outcrop complex, steep Hermon HmE Hermon-Lyman-Rock outcrop complex, steep Lyman HmE Hermon-Lyman-Rock outcrop complex, steep Rock outcrop HnA Hinckley cobbly sandy loam, 0 to 3 percent slopes Hinckley HnB Hinckley cobbly sandy loam, 3 to 8 percent slopes Hinckley HnC Hinckley cobbly sandy loam, 8 to 15 percent slopes Hinckley HpA Hinckley-Plainfield complex, level Hinckley HpA Hinckley-Plainfield complex, level Plainfield HpC Hinckley-Plainfield complex, sloping Hinckley HpC Hinckley-Plainfield complex, sloping Plainfield HpE Hinckley-Plainfield complex, steep Hinckley HpE Hinckley-Plainfield complex, steep Plainfield HuB Hudson silt loam, 3 to 8 percent slopes Hudson HuC Hudson silt loam, 8 to 15 percent slopes Hudson LmC Lyman-Rock outcrop complex, sloping Lyman LmC Lyman-Rock outcrop complex, sloping Rock outcrop LmE Lyman-Rock outcrop complex, steep Lyman LmE Lyman-Rock outcrop complex, steep Rock outcrop LnA Lyme fine sandy loam, 0 to 3 percent slopes Lyme LyA Lyme very stony fine sandy loam, nearly level Lyme Ma Madalin silt loam Madalin MrC Marlow very bouldery fine sandy loam, sloping Marlow MrE Marlow very bouldery fine sandy loam, steep Marlow MsA Massena fine sandy loam, 0 to 3 percent slopes Massena MsA Massena fine sandy loam, 0 to 3 percent slopes Massena Mu Middlebury fine sandy loam Middlebury OaA Oakville loamy fine sand, 0 to 3 percent slopes Oakville OaB Oakville loamy fine sand, 3 to 8 percent slopes Oakville OaC Oakville loamy fine sand, 8 to 15 percent slopes Oakville Pa Palms muck Palms PbB Paxton fine sandy loam, 3 to 8 percent slopes Paxton PbC Paxton fine sandy loam, 8 to 15 percent slopes Paxton PeB Peru very bouldery loam, gently sloping Peru Pg Pits, sand and gravel Pits, sand and g Ph Pits, quarry Pits, quarry PIA Plainfield loamy sand, 0 to 3 percent slopes Plainfield PIB Plainfield loamy sand, 3 to 8 percent slopes Plainfield PIC Plainfield loamy sand, 8 to 15 percent slopes Plainfield PoE Plainfield and Oakville soils, steep Plainfield PoE Plainfield and Oakville soils, steep Oakville Map Unit Map Unit Name Component Na Symbol Ra Raynham silt loam Raynham RhA Rhinebeck silt loam, 0 to 3 percent slopes Rhinebeck RhB Rhinebeck silt loam, 3 to 8 percent slopes Rhinebeck Ro Rock outcrop Rock outcrop Sa Saprists and Aquepts, inundated Saprists Sa Saprists and Aquepts, inundated Aquepts ScA Schroon gravelly fine sandy loam, 0 to 3 percent slopes Schroon ScB Schroon gravelly fine sandy loam, 3 to 8 percent slopes Schroon SdB Schroon very bouldery fine sandy loam, gently sloping Schroon Sh Shaker fine sandy loam Shaker SoB Stowe fine sandy loam, 3 to 8 percent slopes Stowe SoC Stowe fine sandy loam, 8 to 15 percent slopes Stowe SoD Stowe fine sandy loam, 15 to 25 percent slopes Stowe StC Stowe very bouldery fine sandy loam, sloping Stowe StE Stowe very bouldery fine sandy loam, steep Stowe SuB Sutton fine sandy loam, 3 to 8 percent slopes Sutton To Tioga fine sandy loam Tioga Ud Udorthents, smoothed Udorthents W Water Water Wa Wareham loamy sand Wareham Wa Wareham loamy sand Wareham WgB Woodbridge fine sandy loam, 3 to 8 percent slopes Woodbridge WoC Woodstock-Rock outcrop complex, sloping Woodstock WoC Woodstock-Rock outcrop complex, sloping Rock outcrop WoE Woodstock-Rock outcrop complex, steep Woodstock WoE Woodstock-Rock outcrop complex, steep Rock outcrop Chapter 2 Estimating Runoff Technical Release 55 Urban Hydrology for Small Watersheds Table 2-2a Runoff curve numbers for urban areas ii Curve numbers for ——————————————————- Cover description ------------------ -----hydrologic soil group------ Average percent Cover type and hydrologic condition impervious area zi A B C D Fully developed urban areas (vegetation established) Open space(lawns,parks,golf courses,cemeteries,etc.)3/: Poor condition(grass cover<50%).......................................... 68 79 86 89 Fair condition(grass cover 50%to 75%) .................................. 49 69 79 84 Good condition(grass cover>75%)......................................... 39 61 74 80 Impervious areas: Paved parking lots,roofs,driveways,etc. (excluding right-of-way)............................................................. 98 98 98 98 Streets and roads: Paved;curbs and storm sewers(excluding right-of-way) ................................................................................ 98 98 98 98 Paved;open ditches(including right-of-way).......................... 83 89 92 93 Gravel(including right-of-way)................................................. 76 85 89 91 Dirt(including right-of-way)...................................................... 72 82 87 89 Western desert urban areas: Natural desert landscaping(pervious areas only)4i..................... 63 77 85 88 Artificial desert landscaping(impervious weed barrier, desert shrub with 1-to 2-inch sand or gravel mulch and basin borders)...................................................................... 96 96 96 96 Urban districts: Commercial and business................................................................. 85 89 92 94 95 Industrial............................................................................................. 72 81 88 91 93 Residential districts by average lot size: 1/8 acre or less(town houses).......................................................... 65 77 85 90 92 1/4 acre ................................................................................................ 38 61 75 83 87 1/3 acre ................................................................................................ 30 57 72 81 86 1/2 acre ................................................................................................ 25 54 70 80 85 1 acre ................................................................................................... 20 51 68 79 84 2 acres.................................................................................................. 12 46 65 77 82 Developing urban areas Newly graded areas (pervious areas only,no vegetation)5/................................................................ 77 86 91 94 Idle lands(CN's are determined using cover types similar to those in table 2-2c). 1 Average runoff condition,and Ia=0.2S. 2 The average percent impervious area shown was used to develop the composite CN's.Other assumptions are as follows:impervious areas are directly connected to the drainage system,impervious areas have a CN of 98,and pervious areas are considered equivalent to open space in good hydrologic condition.CN's for other combinations of conditions may be computed using figure 2-3 or 2-4. 3 CN's shown are equivalent to those of pasture.Composite CN's may be computed for other combinations of open space cover type. 4 Composite CN's for natural desert landscaping should be computed using figures 2-3 or 2-4 based on the impervious area percentage (CN=98)and the pervious area CN.The pervious area CN's are assumed equivalent to desert shrub in poor hydrologic condition. 5 Composite CN's to use for the design of temporary measures during grading and construction should be computed using figure 2-3 or 2-4 based on the degree of development(impervious area percentage)and the CN's for the newly graded pervious areas. (210-VI-TR-55,Second Ed.,June 1986) 2-5 Chapter 2 Estimating Runoff Technical Release 55 Urban Hydrology for Small Watersheds Table 2-2c Runoff curve numbers for other agricultural lands ii Curve numbers for --------------------------------------- Cover description -------------------------------------- ------------ hydrologic soil group Hydrologic Cover type condition A B C D Pasture,grassland,or range—continuous Poor 68 79 86 89 forage for grazing.2i Fair 49 69 79 84 Good 39 61 74 80 Meadow—continuous grass,protected from — 30 58 71 78 grazing and generally mowed for hay. Brush—brush-weed-grass mixture with brush Poor 48 67 77 83 the major element.3/ Fair 35 56 70 77 Good 301/ 48 65 73 Woods—grass combination(orchard Poor 57 73 82 86 or tree farm).5i Fair 43 65 76 82 Good 32 58 72 79 Woods.W Poor 45 66 77 83 Fair 36 60 73 79 Good 301/ 55 70 77 Farmsteads—buildings,lanes,driveways, — 59 74 82 86 and surrounding lots. 1 Average runoff condition,and Ia=0.25. 2 Poor: <50%)ground cover or heavily grazed with no mulch. Fair: 50 to 75%ground cover and not heavily grazed. Good.• >75%ground cover and lightly or only occasionally grazed. 3 Poor. <50%ground cover. Fair: 50 to 75%ground cover. Good.• >75%ground cover. 4 Actual curve number is less than 30;use CN=30 for runoff computations. CN's shown were computed for areas with 50%woods and 50%grass(pasture)cover.Other combinations of conditions may be computed from the CN's for woods and pasture. 6 Poor: Forest litter,small trees,and brush are destroyed by heavy grazing or regular burning. Fair: Woods are grazed but not burned,and some forest litter covers the soil. Good.• Woods are protected from grazing,and litter and brush adequately cover the soil. (210-VI-TR-55,Second Ed.,June 1986) 2-7 Historical and Natural Resources or Habitat Verification Documents Watershed and Drainage Mapping E1 - SUB-AREA OF SITE THAT STAYS OP TOWARDS AN EXISTING ON SITE DEPR RUNOFF E2 - SUB-AREA OF SITE THAT DISCHAR, NORTH EAST OFF SITE E3 - SUB-AREA OF SITE THAT DISCHAR, SOUTH EAST OFF SITE 0 P� O 7� PAt, �'� �< 2 .3 M HydroCAD Hydrologic Models AND CALCULATIONS IN (90%RAINFALL EVENT) REQ'D SMP PRE-TREATMENT PRE-TREATMENT PRE-TREATMENT WQv* RRv(CF) A IMP(SF) %IMP I Rv WQv(CF) METHODS VOLUME REQ'D VOLUME REQ'D(CF) VOLUME PROVIDED(CF) PROVIDED(CF) PROVIDED 9829 18% 0.21 1159 Sedimentation Basin/IB 100% 1159 1232 n/a 1159 48548 46% 0.46 4896 Sedimentation Basin/IB 100% 4896 4976 n/a 4896 58377 6055 of the WQv,no further WQv volumes are required to be provided in supplemental SMP's. 'VIS1, 10N Engineering MOHAWK INDUSTRIAL WERKS l C 1 ` fir= i /rJ _ . G�"c r. �.,. IPKr l C- 7~C,GL 19n,6- 1AJ V c- ter- Cif p Date: 3/15/17 Project: 140 CAREY RD, QBY By: Daniel W. Ryan P.E. 206 Glen Street-Suite 56•Glens Falls, Mr• 12801 »P518-792-9264-F: 518-792-9282 � w.visionengineeringlic.com 1140MIW Drainage 7yme824-hr2-YearR8infall=275" Prepared by (ePage 29 HydroCAD@ 7:10 s/n 003578 @ 2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond IF»: UB1 Elevation Surface Storage 408.05 48 1 498.10 QS 5 498.15 144 11 498.20 192 19 49825 240 30 498.30 287 43 498.35 335 59 408A0 383 77 49845 431 97 498.50 479 120 498.55 527 145 408.60 575 172 498.65 623 202 498.78 671 235 498J5 719 269 498.88 766 307 498.85 814 346 408.90 862 388 498.95 910 432 499.00 958 479 490.05 1.033 520 49010 1.107 582 49915 1.182 640 409.20 1.257 700 49925 1.332 765 499.30 1,406 834 499.35 1.481 800 499.40 1.556 982 499.45 1.630 1.061 4A05O 1 �U5 1 145 � ' '499.55 1,780 1,232hUku 499.60 1,854 1,323 499.65 1.929 1.417 490.70 2,004 1.516 49075 2.079 1.618 499.80 2.153 1.723 499.85 2.228 1.833 499.90 2.303 1.946 499.95 2.377 2.063 500.80 3,452 2.184 500.05 2.452 2.184 600.10 2.452 2.184 500.15 2.452 2.184 580.20 2.452 2.184 500.25 2.452 2.184 500.30 2.452 2.184 500.35 2.452 2.184 500.40 2.452 2.184 500.45 2.452 2.184 500.50 2.452 2.184 1140 MIW Drainage Type 824-hr2-Year R8infall=275" Prepared by (ente HydroCADO 7.10 s/n 003578 @ 2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond 2P: 8B2 Elevation Surface Storage 407.05 205 5 497.10 418 20 407.15 614 46 407.20 819 82 407.25 1.024 128 497.30 1.220 184 407.35 1.434 251 497.40 1.638 328 497.45 1.843 415 407.50 2.048 512 497.55 2.253 620 497.60 2.458 737 497.65 2.862 866 407.70 2.867 1.004 497.75 3.072 1.152 497.80 3.277 1'311 497.85 3.482 1.480 497.90 3.686 1.659 497.05 3.801 1.848 408.00 4.096 2.048 498.05 4.319 2.258 408.10 4.542 2.480 498.15 4.785 2.713 498.20 4.988 2.956 498.25 5.211 3.211 498.30 5.434 3,478 49835 5.657 3.755 498.40 6.880 4.043 49845 6.103 4.343 408.50 6.327 4.654 i|� - �-�- � CL°�/ . ` 8 S * ` x, w*= 6,773 5,309 408.65 6.098 5.653 498.70 7.219 6.888 49875 7.442 6.375 408.80 7.665 6.762 498.85 7.888 7.141 408.90 8.111 7.541 408.95 8.334 7.952 499.00 8.857 8,375 498.05 8.557 8.375 499.10 8.557 8.375 499.15 8.557 8.375 499.20 8.557 8.375 499.25 8.557 8.375 499.30 8.557 8.375 499.35 8.557 8.375 499.40 8.557 8.375 499.45 8.557 8.375 499.50 8.557 8.375 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 34 HydroCAD@ 7.10 s/n 003578 @ 2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond IT2: Drywell Capacity Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) 492.58 0.00 495.23 0.20 492.63 0.18 495.28 0.20 492.68 0.18 495.33 0.20 492.73 0.18 495.38 0.20 492.78 0.18 495.43 0.20 )IP&Ou' 492.83 0.18 495.48 0.20 492.88 0.18 495.53 0.20 492.93 0.18 495.58 0.20 F�/L 492.98 0.18 495.63 0.20 493.03 0.18 495.68 0.20 493.08 0.18 495.73 0.20 493.13 0.19 495.78 0.20 493.18 0.19 495.83 0.20 493.23 0.19 495.88 0.21 493.28 0.19 495.93 0.21 493.33 0.19 495.98 0.21 493.38 0.19 496.03 0.21 493.43 0.19 496.08 0.21 493.48 0.19 496.13 0.21 493.53 0.19 496.18 0.21 493.58 0.19 496.23 0.21 493.63 0.19 496.28 0.21 493.68 0.19 496.33 0.21 493.73 0.19 496.38 0.21 493.78 0.19 496.43 0.21 49183 0.19 496.48 0.21 493.88 0.19 496.53 0.21 493.93 0.19 496.58 0.21 493.98 0.19 496.63 0.21 494.03 0.19 496.68 0.21 494.08 0.19 496.73 0.21 494.13 0A9 496.78 0.21 494.18 0.19 496.83 0.21 494.23 0.19 496.88 0.21 494.28 0.19 496.93 0.21 494.33 0.19 496.98 0.21 49438 0.19 497.03 0.21 494.43 0.19 497.08 0.21 494.48 0.19 497.13 0.21 494.53 0.20 497.18 0.21 494.58 0.20 497.23 0.22 494.63 0.20 497.28 0.22 494.68 0.20 497.33 0.22 494.73 0.20 497.38 0.22 494.78 0.20 497.43 0.22 494.83 0.20 497.48 0.22 494.88 0.20 497.53 0.22 494.93 0.20 497.58 0.22 494.98 0.20 495.03 0.20 495.08 0.20 495.13 0.20 495.18 0.20 iElj2 E3 Pre-Development Pre-Development Pre-Development Runoff (Remains On Runoff (Discharges Runoff (Discharges Site) Offsite to North) Offsite to South) (Pi) (P2 (P3 Post-Dev lopment Post-Development Post Development Runoff to 1 1 (Remains Runoff (Undisturbed Runoff (Undisturbed On ite) Area Discharges Offsite Area Discharges Offsite to North) to South) 1 P P4 2 P Post-Development 1132 1131 Runoff (Remains On Site) IT2 Drywell Capacity SubcatReach on Link Drainage Diagram for 1140 MIW Drainage Prepared by{enter your company name here} 3/15/2017 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 2 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment E1: Pre-Development Runoff(Remains On SitdRunoff Area=81,116 sf Runoff Depth=0.00" Flow Length=340' Tc=32.8 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment E2: Pre-Development Runoff(Discharges OffsRunoff Area=69,883 sf Runoff Depth=0.00" Flow Length=365' Tc=39.7 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment E3: Pre-Development Runoff(Discharges OffRunoff Area=124,045 sf Runoff Depth=0.00" Flow Length=540' Tc=68.0 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P1: Post-Development Runoff to I131 (RemainsRunoff Area=54,840 sf Runoff Depth=0.00" Flow Length=238' Tc=24.3 min CN=45 Runoff=0.00 cfs 0.000 of Subcatchment P2: Post-Development Runoff(Undisturbed AiRunoff Area=35,553 sf Runoff Depth=0.00" Flow Length=160' Tc=19.4 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P3: Post Development Runoff(Undisturbed AiRunoff Area=79,206 sf Runoff Depth=0.00" Flow Length=254' Tc=43.2 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P4: Post-Development Runoff(Remains On SRunoff Area=105,334 sf Runoff Depth=0.13" Flow Length=448' Tc=31.5 min CN=63 Runoff=0.07 cfs 0.025 of Pond 1P: I131 Peak EIev=498.00' Storage=0 cf Inflow=0.00 cfs 0.000 of Outflow=0.00 cfs 0.000 of Pond 2P: I132 Peak EIev=497.73' Storage=1,105 cf Inflow=0.07 cfs 0.025 of Outflow=0.00 cfs 0.000 of Pond IT2: Drywell Capacity Peak EIev=0.00' Storage=0 cf Discarded=0.00 cfs 0.000 of Total Runoff Area = 12.626 ac Runoff Volume = 0.025 of Average Runoff Depth = 0.02" 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 3 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E1: Pre-Development Runoff (Remains On Site) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 1-Year Rainfall=2.10" Area (sf) CN Description 81,116 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 27.5 144 0.0270 0.1 Sheet Flow, SFE1 Woods: Light underbrush n= 0.400 P2= 2.75" 5.3 196 0.0150 0.6 Shallow Concentrated Flow, SCFE1 Woodland Kv= 5.0 fps 32.8 340 Total 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 4 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E2: Pre-Development Runoff (Discharges Offsite to North) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 1-Year Rainfall=2.10" Area (sf) CN Description 69,883 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.3 95 0.0100 0.1 Sheet Flow, SFE2 Woods: Light underbrush n= 0.400 P2= 2.75" 10.4 270 0.0075 0.4 Shallow Concentrated Flow, SCFE2 Woodland Kv= 5.0 fps 39.7 365 Total 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 5 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E3: Pre-Development Runoff (Discharges Offsite to South) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 1-Year Rainfall=2.10" Area (sf) CN Description 124,045 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 49.6 150 0.0067 0.1 Sheet Flow, SFE3 Woods: Light underbrush n= 0.400 P2= 2.75" 18.4 390 0.0050 0.4 Shallow Concentrated Flow, SCFE3 Woodland Kv= 5.0 fps 68.0 540 Total 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 6 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P1: Post-Development Runoff to 1131 (Remains On Site) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 1-Year Rainfall=2.10" Area (sf) CN Description 30,315 30 Woods, Good, HSG A 14,696 39 >75% Grass cover, Good, HSG A 9,829 98 Paved parking & roofs 54,840 45 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 100 0.0270 0.1 Sheet Flow, SFP1 Woods: Light underbrush n= 0.400 P2= 2.75" 3.8 138 0.0150 0.6 Shallow Concentrated Flow, SCFP1 Woodland Kv= 5.0 fps 24.3 238 Total 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 7 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P2: Post-Development Runoff (Undisturbed Area Discharges Offsite to North) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 1-Year Rainfall=2.10" Area (sf) CN Description 35,553 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.1 50 0.0125 0.1 Sheet Flow, SFP2 Woods: Light underbrush n= 0.400 P2= 2.75" 3.3 110 0.0125 0.6 Shallow Concentrated Flow, SCFP2 Woodland Kv= 5.0 fps 19.4 160 Total 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 8 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P3: Post Development Runoff (Undisturbed Area Discharges Offsite to South) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 1-Year Rainfall=2.10" Area (sf) CN Description 79,206 30 Forest Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 35.9 100 0.0067 0.0 Sheet Flow, SFP3 Woods: Light underbrush n= 0.400 P2= 2.75" 7.3 154 0.0050 0.4 Shallow Concentrated Flow, SCFP3 Woodland Kv= 5.0 fps 43.2 254 Total 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 9 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P4: Post-Development Runoff (Remains On Site) Runoff = 0.07 cfs @ 12.50 hrs, Volume= 0.025 af, Depth= 0.13" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 1-Year Rainfall=2.10" Area (sf) CN Description 33,354 30 Woods, Good, HSG A 48,548 98 Paved parking & roofs 23,432 39 >75% Grass cover, Good, HSG A 105,334 63 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 72 0.0140 0.1 Sheet Flow, SFP4 Woods: Light underbrush n= 0.400 P2= 2.75" 11.0 376 0.0130 0.6 Shallow Concentrated Flow, SCFP4 Woodland Kv= 5.0 fps 31.5 448 Total 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 10 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond 1P: 1B1 Inflow Area = 1.259 ac, Inflow Depth = 0.00" for 1-Year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 498.00' @ 0.00 hrs Surf.Area= 0 sf Storage= 0 cf Flood Elev= 500.50' Surf.Area= 2,452 sf Storage= 2,184 cf Plug-Flow detention time= (not calculated: initial storage excedes outflow) Center-of-Mass det. time= (not calculated: no inflow) Volume Invert Avail.Storage Storage Description #1 498.00' 2,184 cf I1131 (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 498.00 0 0 0 499.00 958 479 479 500.00 2,452 1,705 2,184 Device Routing Invert Outlet Devices #1 Discarded 499.55' 0.36 cfs Exfiltration when above invert Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=498.00' (Free Discharge) L1=Exfiltration ( Controls 0.00 cfs) 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 11 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond 1 P: 1B1 Elevation Discarded Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) (feet) (cfs) 498.00 0.00 499.06 0.00 500.12 0.36 498.02 0.00 499.08 0.00 500.14 0.36 498.04 0.00 499.10 0.00 500.16 0.36 498.06 0.00 499.12 0.00 500.18 0.36 498.08 0.00 499.14 0.00 500.20 0.36 498.10 0.00 499.16 0.00 500.22 0.36 498.12 0.00 499.18 0.00 500.24 0.36 498.14 0.00 499.20 0.00 500.26 0.36 498.16 0.00 499.22 0.00 500.28 0.36 498.18 0.00 499.24 0.00 500.30 0.36 498.20 0.00 499.26 0.00 500.32 0.36 498.22 0.00 499.28 0.00 500.34 0.36 498.24 0.00 499.30 0.00 500.36 0.36 498.26 0.00 499.32 0.00 500.38 0.36 498.28 0.00 499.34 0.00 500.40 0.36 498.30 0.00 499.36 0.00 500.42 0.36 498.32 0.00 499.38 0.00 500.44 0.36 498.34 0.00 499.40 0.00 500.46 0.36 498.36 0.00 499.42 0.00 500.48 0.36 498.38 0.00 499.44 0.00 500.50 0.36 498.40 0.00 499.46 0.00 498.42 0.00 499.48 0.00 498.44 0.00 499.50 0.00 498.46 0.00 499.52 0.00 498.48 0.00 499.54 0.00 498.50 0.00 499.56 0.36 498.52 0.00 499.58 0.36 498.54 0.00 499.60 0.36 498.56 0.00 499.62 0.36 498.58 0.00 499.64 0.36 498.60 0.00 499.66 0.36 498.62 0.00 499.68 0.36 498.64 0.00 499.70 0.36 498.66 0.00 499.72 0.36 498.68 0.00 499.74 0.36 498.70 0.00 499.76 0.36 498.72 0.00 499.78 0.36 498.74 0.00 499.80 0.36 498.76 0.00 499.82 0.36 498.78 0.00 499.84 0.36 498.80 0.00 499.86 0.36 498.82 0.00 499.88 0.36 498.84 0.00 499.90 0.36 498.86 0.00 499.92 0.36 498.88 0.00 499.94 0.36 498.90 0.00 499.96 0.36 498.92 0.00 499.98 0.36 498.94 0.00 500.00 0.36 498.96 0.00 500.02 0.36 498.98 0.00 500.04 0.36 499.00 0.00 500.06 0.36 499.02 0.00 500.08 0.36 499.04 0.00 500.10 0.36 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 12 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond 1 P: 1B1 Elevation Surface Storage (feet) (sq-ft) (cubic-feet) 498.00 0 0 498.05 48 1 498.10 96 5 498.15 144 11 498.20 192 19 498.25 240 30 498.30 287 43 498.35 335 59 498.40 383 77 498.45 431 97 498.50 479 120 498.55 527 145 498.60 575 172 498.65 623 202 498.70 671 235 498.75 719 269 498.80 766 307 498.85 814 346 498.90 862 388 498.95 910 432 499.00 958 479 499.05 1,033 529 499.10 1,107 582 499.15 1,182 640 499.20 1,257 700 499.25 1,332 765 499.30 1,406 834 499.35 1,481 906 499.40 1,556 982 499.45 1,630 1,061 499.50 1,705 1,145 499.55 1,780 1,232 499.60 1,854 1,323 499.65 1,929 1,417 499.70 2,004 1,516 499.75 2,079 1,618 499.80 2,153 1,723 499.85 2,228 1,833 499.90 2,303 1,946 499.95 2,377 2,063 500.00 2,452 2,184 500.05 2,452 2,184 500.10 2,452 2,184 500.15 2,452 2,184 500.20 2,452 2,184 500.25 2,452 2,184 500.30 2,452 2,184 500.35 2,452 2,184 500.40 2,452 2,184 500.45 2,452 2,184 500.50 2,452 2,184 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 13 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond 2P: 1B2 Inflow Area = 2.418 ac, Inflow Depth = 0.13" for 1-Year event Inflow = 0.07 cfs @ 12.50 hrs, Volume= 0.025 of Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 100%, Lag= 0.0 min Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 497.73' @ 25.77 hrs Surf.Area= 3,009 sf Storage= 1,105 cf Flood Elev= 499.50' Surf.Area= 8,557 sf Storage= 8,375 cf Plug-Flow detention time= (not calculated: initial storage excedes outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 497.00' 8,375 cf I1132 (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 497.00 0 0 0 498.00 4,096 2,048 2,048 499.00 8,557 6,327 8,375 Device Routing Invert Outlet Devices #1 Discarded 498.50' 0.90 cfs Exfiltration when above invert Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=497.00' (Free Discharge) L1=Exfiltration ( Controls 0.00 cfs) 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 14 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond 2P: 1B2 Elevation Discarded Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) (feet) (cfs) 497.00 0.00 498.06 0.00 499.12 0.90 497.02 0.00 498.08 0.00 499.14 0.90 497.04 0.00 498.10 0.00 499.16 0.90 497.06 0.00 498.12 0.00 499.18 0.90 497.08 0.00 498.14 0.00 499.20 0.90 497.10 0.00 498.16 0.00 499.22 0.90 497.12 0.00 498.18 0.00 499.24 0.90 497.14 0.00 498.20 0.00 499.26 0.90 497.16 0.00 498.22 0.00 499.28 0.90 497.18 0.00 498.24 0.00 499.30 0.90 497.20 0.00 498.26 0.00 499.32 0.90 497.22 0.00 498.28 0.00 499.34 0.90 497.24 0.00 498.30 0.00 499.36 0.90 497.26 0.00 498.32 0.00 499.38 0.90 497.28 0.00 498.34 0.00 499.40 0.90 497.30 0.00 498.36 0.00 499.42 0.90 497.32 0.00 498.38 0.00 499.44 0.90 497.34 0.00 498.40 0.00 499.46 0.90 497.36 0.00 498.42 0.00 499.48 0.90 497.38 0.00 498.44 0.00 499.50 0.90 497.40 0.00 498.46 0.00 497.42 0.00 498.48 0.00 497.44 0.00 498.50 0.00 497.46 0.00 498.52 0.90 497.48 0.00 498.54 0.90 497.50 0.00 498.56 0.90 497.52 0.00 498.58 0.90 497.54 0.00 498.60 0.90 497.56 0.00 498.62 0.90 497.58 0.00 498.64 0.90 497.60 0.00 498.66 0.90 497.62 0.00 498.68 0.90 497.64 0.00 498.70 0.90 497.66 0.00 498.72 0.90 497.68 0.00 498.74 0.90 497.70 0.00 498.76 0.90 497.72 0.00 498.78 0.90 497.74 0.00 498.80 0.90 497.76 0.00 498.82 0.90 497.78 0.00 498.84 0.90 497.80 0.00 498.86 0.90 497.82 0.00 498.88 0.90 497.84 0.00 498.90 0.90 497.86 0.00 498.92 0.90 497.88 0.00 498.94 0.90 497.90 0.00 498.96 0.90 497.92 0.00 498.98 0.90 497.94 0.00 499.00 0.90 497.96 0.00 499.02 0.90 497.98 0.00 499.04 0.90 498.00 0.00 499.06 0.90 498.02 0.00 499.08 0.90 498.04 0.00 499.10 0.90 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 15 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond 2P: 1B2 Elevation Surface Storage (feet) (sq-ft) (cubic-feet) 497.00 0 0 497.05 205 5 497.10 410 20 497.15 614 46 497.20 819 82 497.25 1,024 128 497.30 1,229 184 497.35 1,434 251 497.40 1,638 328 497.45 1,843 415 497.50 2,048 512 497.55 2,253 620 497.60 2,458 737 497.65 2,662 865 497.70 2,867 1,004 497.75 3,072 1,152 497.80 3,277 1,311 497.85 3,482 1,480 497.90 3,686 1,659 497.95 3,891 1,848 498.00 4,096 2,048 498.05 4,319 2,258 498.10 4,542 2,480 498.15 4,765 2,713 498.20 4,988 2,956 498.25 5,211 3,211 498.30 5,434 3,478 498.35 5,657 3,755 498.40 5,880 4,043 498.45 6,103 4,343 498.50 6,327 4,654 498.55 6,550 4,976 498.60 6,773 5,309 498.65 6,996 5,653 498.70 7,219 6,008 498.75 7,442 6,375 498.80 7,665 6,752 498.85 7,888 7,141 498.90 8,111 7,541 498.95 8,334 7,952 499.00 8,557 8,375 499.05 8,557 8,375 499.10 8,557 8,375 499.15 8,557 8,375 499.20 8,557 8,375 499.25 8,557 8,375 499.30 8,557 8,375 499.35 8,557 8,375 499.40 8,557 8,375 499.45 8,557 8,375 499.50 8,557 8,375 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 16 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond IT2: Drywell Capacity Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 0.00' @ 0.00 hrs Surf.Area= 0 sf Storage= 0 cf Flood Elev= 497.58' Surf.Area= 95 sf Storage= 294 cf Plug-Flow detention time= (not calculated) Center-of-Mass det. time= (not calculated) Volume Invert Avail.Storage Storage Description #1 492.58' 94 cf Custom Stage Data (Prismatic)Listed below (Recalc) 435 cf Overall - 200 cf Embedded = 235 cf x 40.0% Voids #2 493.58' 200 cf Precast Unit (Prismatic)Listed below (Recalc) Inside #1 294 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 492.58 79 0 0 497.58 95 435 435 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 493.58 50 0 0 497.58 50 200 200 Device Routing Invert Outlet Devices #1 Discarded 0.00' 99.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=0.00' (Free Discharge) L1=Exfiltration ( Controls 0.00 cfs) 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 17 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond IT2: Drywell Capacity Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) 492.58 0.00 495.23 0.20 492.63 0.18 495.28 0.20 492.68 0.18 495.33 0.20 492.73 0.18 495.38 0.20 492.78 0.18 495.43 0.20 492.83 0.18 495.48 0.20 492.88 0.18 495.53 0.20 492.93 0.18 495.58 0.20 492.98 0.18 495.63 0.20 493.03 0.18 495.68 0.20 493.08 0.18 495.73 0.20 493.13 0.19 495.78 0.20 493.18 0.19 495.83 0.20 493.23 0.19 495.88 0.21 493.28 0.19 495.93 0.21 493.33 0.19 495.98 0.21 493.38 0.19 496.03 0.21 493.43 0.19 496.08 0.21 493.48 0.19 496.13 0.21 493.53 0.19 496.18 0.21 493.58 0.19 496.23 0.21 493.63 0.19 496.28 0.21 493.68 0.19 496.33 0.21 493.73 0.19 496.38 0.21 493.78 0.19 496.43 0.21 493.83 0.19 496.48 0.21 493.88 0.19 496.53 0.21 493.93 0.19 496.58 0.21 493.98 0.19 496.63 0.21 494.03 0.19 496.68 0.21 494.08 0.19 496.73 0.21 494.13 0.19 496.78 0.21 494.18 0.19 496.83 0.21 494.23 0.19 496.88 0.21 494.28 0.19 496.93 0.21 494.33 0.19 496.98 0.21 494.38 0.19 497.03 0.21 494.43 0.19 497.08 0.21 494.48 0.19 497.13 0.21 494.53 0.20 497.18 0.21 494.58 0.20 497.23 0.22 494.63 0.20 497.28 0.22 494.68 0.20 497.33 0.22 494.73 0.20 497.38 0.22 494.78 0.20 497.43 0.22 494.83 0.20 497.48 0.22 494.88 0.20 497.53 0.22 494.93 0.20 497.58 0.22 494.98 0.20 495.03 0.20 495.08 0.20 495.13 0.20 495.18 0.20 1140 MIW Drainage Type 11 24-hr 1-Year Rainfall=2.10" Prepared by {enter your company name here} Page 18 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond IT2: Drywell Capacity Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 492.58 79 0 495.23 87 138 492.63 79 2 495.28 88 141 492.68 79 3 495.33 88 144 492.73 79 5 495.38 88 147 492.78 80 6 495.43 88 151 492.83 80 8 495.48 88 154 492.88 80 10 495.53 88 157 492.93 80 11 495.58 89 161 492.98 80 13 495.63 89 164 493.03 80 14 495.68 89 167 493.08 81 16 495.73 89 170 493.13 81 18 495.78 89 174 493.18 81 19 495.83 89 177 493.23 81 21 495.88 90 180 493.28 81 22 495.93 90 184 493.33 81 24 495.98 90 187 493.38 82 26 496.03 90 190 493.43 82 27 496.08 90 193 493.48 82 29 496.13 90 197 493.53 82 31 496.18 91 200 493.58 82 32 496.23 91 203 493.63 82 35 496.28 91 207 493.68 83 39 496.33 91 210 493.73 83 42 496.38 91 213 493.78 83 45 496.43 91 217 493.83 83 48 496.48 91 220 493.88 83 51 496.53 92 223 493.93 83 54 496.58 92 227 493.98 83 57 496.63 92 230 494.03 84 61 496.68 92 233 494.08 84 64 496.73 92 237 494.13 84 67 496.78 92 240 494.18 84 70 496.83 93 243 494.23 84 73 496.88 93 247 494.28 84 77 496.93 93 250 494.33 85 80 496.98 93 253 494.38 85 83 497.03 93 257 494.43 85 86 497.08 93 260 494.48 85 89 497.13 94 264 494.53 85 93 497.18 94 267 494.58 85 96 497.23 94 270 494.63 86 99 497.28 94 274 494.68 86 102 497.33 94 277 494.73 86 105 497.38 94 280 494.78 86 109 497.43 95 284 494.83 86 112 497.48 95 287 494.88 86 115 497.53 95 291 494.93 87 118 497.58 95 294 494.98 87 122 495.03 87 125 495.08 87 128 495.13 87 131 495.18 87 134 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 19 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment E1: Pre-Development Runoff(Remains On SitdRunoff Area=81,116 sf Runoff Depth=0.00" Flow Length=340' Tc=32.8 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment E2: Pre-Development Runoff(Discharges OffsRunoff Area=69,883 sf Runoff Depth=0.00" Flow Length=365' Tc=39.7 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment E3: Pre-Development Runoff(Discharges OffRunoff Area=124,045 sf Runoff Depth=0.00" Flow Length=540' Tc=68.0 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P1: Post-Development Runoff to I131 (RemainsRunoff Area=54,840 sf Runoff Depth=0.01" Flow Length=238' Tc=24.3 min CN=45 Runoff=0.00 cfs 0.001 of Subcatchment P2: Post-Development Runoff(Undisturbed AiRunoff Area=35,553 sf Runoff Depth=0.00" Flow Length=160' Tc=19.4 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P3: Post Development Runoff(Undisturbed AiRunoff Area=79,206 sf Runoff Depth=0.00" Flow Length=254' Tc=43.2 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P4: Post-Development Runoff(Remains On SRunoff Area=105,334 sf Runoff Depth=0.33" Flow Length=448' Tc=31.5 min CN=63 Runoff=0.39 cfs 0.067 of Pond 1P: I131 Peak Elev=498.27' Storage=34 cf Inflow=0.00 cfs 0.001 of Outflow=0.00 cfs 0.000 of Pond 2P: I132 Peak Elev=498.19' Storage=2,925 cf Inflow=0.39 cfs 0.067 of Outflow=0.00 cfs 0.000 of Pond IT2: Drywell Capacity Peak Elev=0.00' Storage=0 cf Discarded=0.00 cfs 0.000 of Total Runoff Area = 12.626 ac Runoff Volume = 0.068 of Average Runoff Depth = 0.06" 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 20 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E1: Pre-Development Runoff (Remains On Site) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Rainfall=2.75" Area (sf) CN Description 81,116 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 27.5 144 0.0270 0.1 Sheet Flow, SFE1 Woods: Light underbrush n= 0.400 P2= 2.75" 5.3 196 0.0150 0.6 Shallow Concentrated Flow, SCFE1 Woodland Kv= 5.0 fps 32.8 340 Total 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 21 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E2: Pre-Development Runoff (Discharges Offsite to North) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Rainfall=2.75" Area (sf) CN Description 69,883 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.3 95 0.0100 0.1 Sheet Flow, SFE2 Woods: Light underbrush n= 0.400 P2= 2.75" 10.4 270 0.0075 0.4 Shallow Concentrated Flow, SCFE2 Woodland Kv= 5.0 fps 39.7 365 Total 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 22 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E3: Pre-Development Runoff (Discharges Offsite to South) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Rainfall=2.75" Area (sf) CN Description 124,045 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 49.6 150 0.0067 0.1 Sheet Flow, SFE3 Woods: Light underbrush n= 0.400 P2= 2.75" 18.4 390 0.0050 0.4 Shallow Concentrated Flow, SCFE3 Woodland Kv= 5.0 fps 68.0 540 Total 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 23 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P1: Post-Development Runoff to 1131 (Remains On Site) Runoff = 0.00 cfs @ 24.05 hrs, Volume= 0.001 af, Depth= 0.01" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Rainfall=2.75" Area (sf) CN Description 30,315 30 Woods, Good, HSG A 14,696 39 >75% Grass cover, Good, HSG A 9,829 98 Paved parking & roofs 54,840 45 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 100 0.0270 0.1 Sheet Flow, SFP1 Woods: Light underbrush n= 0.400 P2= 2.75" 3.8 138 0.0150 0.6 Shallow Concentrated Flow, SCFP1 Woodland Kv= 5.0 fps 24.3 238 Total 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 24 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P2: Post-Development Runoff (Undisturbed Area Discharges Offsite to North) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Rainfall=2.75" Area (sf) CN Description 35,553 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.1 50 0.0125 0.1 Sheet Flow, SFP2 Woods: Light underbrush n= 0.400 P2= 2.75" 3.3 110 0.0125 0.6 Shallow Concentrated Flow, SCFP2 Woodland Kv= 5.0 fps 19.4 160 Total 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 25 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P3: Post Development Runoff (Undisturbed Area Discharges Offsite to South) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Rainfall=2.75" Area (sf) CN Description 79,206 30 Forest Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 35.9 100 0.0067 0.0 Sheet Flow, SFP3 Woods: Light underbrush n= 0.400 P2= 2.75" 7.3 154 0.0050 0.4 Shallow Concentrated Flow, SCFP3 Woodland Kv= 5.0 fps 43.2 254 Total 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 26 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P4: Post-Development Runoff (Remains On Site) Runoff = 0.39 cfs @ 12.36 hrs, Volume= 0.067 af, Depth= 0.33" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Rainfall=2.75" Area (sf) CN Description 33,354 30 Woods, Good, HSG A 48,548 98 Paved parking & roofs 23,432 39 >75% Grass cover, Good, HSG A 105,334 63 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 72 0.0140 0.1 Sheet Flow, SFP4 Woods: Light underbrush n= 0.400 P2= 2.75" 11.0 376 0.0130 0.6 Shallow Concentrated Flow, SCFP4 Woodland Kv= 5.0 fps 31.5 448 Total 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 27 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond 1P: 1B1 Inflow Area = 1.259 ac, Inflow Depth = 0.01" for 2-Year event Inflow = 0.00 cfs @ 24.05 hrs, Volume= 0.001 of Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 100%, Lag= 0.0 min Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 498.27' @ 25.39 hrs Surf.Area= 255 sf Storage= 34 cf Flood Elev= 500.50' Surf.Area= 2,452 sf Storage= 2,184 cf Plug-Flow detention time= (not calculated: initial storage excedes outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 498.00' 2,184 cf I1131 (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 498.00 0 0 0 499.00 958 479 479 500.00 2,452 1,705 2,184 Device Routing Invert Outlet Devices #1 Discarded 499.55' 0.36 cfs Exfiltration when above invert Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=498.00' (Free Discharge) L1=Exfiltration ( Controls 0.00 cfs) 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 28 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond 1 P: 1B1 Elevation Discarded Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) (feet) (cfs) 498.00 0.00 499.06 0.00 500.12 0.36 498.02 0.00 499.08 0.00 500.14 0.36 498.04 0.00 499.10 0.00 500.16 0.36 498.06 0.00 499.12 0.00 500.18 0.36 498.08 0.00 499.14 0.00 500.20 0.36 498.10 0.00 499.16 0.00 500.22 0.36 498.12 0.00 499.18 0.00 500.24 0.36 498.14 0.00 499.20 0.00 500.26 0.36 498.16 0.00 499.22 0.00 500.28 0.36 498.18 0.00 499.24 0.00 500.30 0.36 498.20 0.00 499.26 0.00 500.32 0.36 498.22 0.00 499.28 0.00 500.34 0.36 498.24 0.00 499.30 0.00 500.36 0.36 498.26 0.00 499.32 0.00 500.38 0.36 498.28 0.00 499.34 0.00 500.40 0.36 498.30 0.00 499.36 0.00 500.42 0.36 498.32 0.00 499.38 0.00 500.44 0.36 498.34 0.00 499.40 0.00 500.46 0.36 498.36 0.00 499.42 0.00 500.48 0.36 498.38 0.00 499.44 0.00 500.50 0.36 498.40 0.00 499.46 0.00 498.42 0.00 499.48 0.00 498.44 0.00 499.50 0.00 498.46 0.00 499.52 0.00 498.48 0.00 499.54 0.00 498.50 0.00 499.56 0.36 498.52 0.00 499.58 0.36 498.54 0.00 499.60 0.36 498.56 0.00 499.62 0.36 498.58 0.00 499.64 0.36 498.60 0.00 499.66 0.36 498.62 0.00 499.68 0.36 498.64 0.00 499.70 0.36 498.66 0.00 499.72 0.36 498.68 0.00 499.74 0.36 498.70 0.00 499.76 0.36 498.72 0.00 499.78 0.36 498.74 0.00 499.80 0.36 498.76 0.00 499.82 0.36 498.78 0.00 499.84 0.36 498.80 0.00 499.86 0.36 498.82 0.00 499.88 0.36 498.84 0.00 499.90 0.36 498.86 0.00 499.92 0.36 498.88 0.00 499.94 0.36 498.90 0.00 499.96 0.36 498.92 0.00 499.98 0.36 498.94 0.00 500.00 0.36 498.96 0.00 500.02 0.36 498.98 0.00 500.04 0.36 499.00 0.00 500.06 0.36 499.02 0.00 500.08 0.36 499.04 0.00 500.10 0.36 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 29 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond 1 P: 1B1 Elevation Surface Storage (feet) (sq-ft) (cubic-feet) 498.00 0 0 498.05 48 1 498.10 96 5 498.15 144 11 498.20 192 19 498.25 240 30 498.30 287 43 498.35 335 59 498.40 383 77 498.45 431 97 498.50 479 120 498.55 527 145 498.60 575 172 498.65 623 202 498.70 671 235 498.75 719 269 498.80 766 307 498.85 814 346 498.90 862 388 498.95 910 432 499.00 958 479 499.05 1,033 529 499.10 1,107 582 499.15 1,182 640 499.20 1,257 700 499.25 1,332 765 499.30 1,406 834 499.35 1,481 906 499.40 1,556 982 499.45 1,630 1,061 499.50 1,705 1,145 499.55 1,780 1,232 499.60 1,854 1,323 499.65 1,929 1,417 499.70 2,004 1,516 499.75 2,079 1,618 499.80 2,153 1,723 499.85 2,228 1,833 499.90 2,303 1,946 499.95 2,377 2,063 500.00 2,452 2,184 500.05 2,452 2,184 500.10 2,452 2,184 500.15 2,452 2,184 500.20 2,452 2,184 500.25 2,452 2,184 500.30 2,452 2,184 500.35 2,452 2,184 500.40 2,452 2,184 500.45 2,452 2,184 500.50 2,452 2,184 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 30 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond 2P: 1B2 Inflow Area = 2.418 ac, Inflow Depth = 0.33" for 2-Year event Inflow = 0.39 cfs @ 12.36 hrs, Volume= 0.067 of Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 100%, Lag= 0.0 min Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 498.19' @ 25.77 hrs Surf.Area= 4,960 sf Storage= 2,925 cf Flood Elev= 499.50' Surf.Area= 8,557 sf Storage= 8,375 cf Plug-Flow detention time= (not calculated: initial storage excedes outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 497.00' 8,375 cf I1132 (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 497.00 0 0 0 498.00 4,096 2,048 2,048 499.00 8,557 6,327 8,375 Device Routing Invert Outlet Devices #1 Discarded 498.50' 0.90 cfs Exfiltration when above invert Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=497.00' (Free Discharge) L1=Exfiltration ( Controls 0.00 cfs) 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 31 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond 2P: 1B2 Elevation Discarded Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) (feet) (cfs) 497.00 0.00 498.06 0.00 499.12 0.90 497.02 0.00 498.08 0.00 499.14 0.90 497.04 0.00 498.10 0.00 499.16 0.90 497.06 0.00 498.12 0.00 499.18 0.90 497.08 0.00 498.14 0.00 499.20 0.90 497.10 0.00 498.16 0.00 499.22 0.90 497.12 0.00 498.18 0.00 499.24 0.90 497.14 0.00 498.20 0.00 499.26 0.90 497.16 0.00 498.22 0.00 499.28 0.90 497.18 0.00 498.24 0.00 499.30 0.90 497.20 0.00 498.26 0.00 499.32 0.90 497.22 0.00 498.28 0.00 499.34 0.90 497.24 0.00 498.30 0.00 499.36 0.90 497.26 0.00 498.32 0.00 499.38 0.90 497.28 0.00 498.34 0.00 499.40 0.90 497.30 0.00 498.36 0.00 499.42 0.90 497.32 0.00 498.38 0.00 499.44 0.90 497.34 0.00 498.40 0.00 499.46 0.90 497.36 0.00 498.42 0.00 499.48 0.90 497.38 0.00 498.44 0.00 499.50 0.90 497.40 0.00 498.46 0.00 497.42 0.00 498.48 0.00 497.44 0.00 498.50 0.00 497.46 0.00 498.52 0.90 497.48 0.00 498.54 0.90 497.50 0.00 498.56 0.90 497.52 0.00 498.58 0.90 497.54 0.00 498.60 0.90 497.56 0.00 498.62 0.90 497.58 0.00 498.64 0.90 497.60 0.00 498.66 0.90 497.62 0.00 498.68 0.90 497.64 0.00 498.70 0.90 497.66 0.00 498.72 0.90 497.68 0.00 498.74 0.90 497.70 0.00 498.76 0.90 497.72 0.00 498.78 0.90 497.74 0.00 498.80 0.90 497.76 0.00 498.82 0.90 497.78 0.00 498.84 0.90 497.80 0.00 498.86 0.90 497.82 0.00 498.88 0.90 497.84 0.00 498.90 0.90 497.86 0.00 498.92 0.90 497.88 0.00 498.94 0.90 497.90 0.00 498.96 0.90 497.92 0.00 498.98 0.90 497.94 0.00 499.00 0.90 497.96 0.00 499.02 0.90 497.98 0.00 499.04 0.90 498.00 0.00 499.06 0.90 498.02 0.00 499.08 0.90 498.04 0.00 499.10 0.90 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 32 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond 2P: 1B2 Elevation Surface Storage (feet) (sq-ft) (cubic-feet) 497.00 0 0 497.05 205 5 497.10 410 20 497.15 614 46 497.20 819 82 497.25 1,024 128 497.30 1,229 184 497.35 1,434 251 497.40 1,638 328 497.45 1,843 415 497.50 2,048 512 497.55 2,253 620 497.60 2,458 737 497.65 2,662 865 497.70 2,867 1,004 497.75 3,072 1,152 497.80 3,277 1,311 497.85 3,482 1,480 497.90 3,686 1,659 497.95 3,891 1,848 498.00 4,096 2,048 498.05 4,319 2,258 498.10 4,542 2,480 498.15 4,765 2,713 498.20 4,988 2,956 498.25 5,211 3,211 498.30 5,434 3,478 498.35 5,657 3,755 498.40 5,880 4,043 498.45 6,103 4,343 498.50 6,327 4,654 498.55 6,550 4,976 498.60 6,773 5,309 498.65 6,996 5,653 498.70 7,219 6,008 498.75 7,442 6,375 498.80 7,665 6,752 498.85 7,888 7,141 498.90 8,111 7,541 498.95 8,334 7,952 499.00 8,557 8,375 499.05 8,557 8,375 499.10 8,557 8,375 499.15 8,557 8,375 499.20 8,557 8,375 499.25 8,557 8,375 499.30 8,557 8,375 499.35 8,557 8,375 499.40 8,557 8,375 499.45 8,557 8,375 499.50 8,557 8,375 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 33 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond IT2: Drywell Capacity Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 0.00' @ 0.00 hrs Surf.Area= 0 sf Storage= 0 cf Flood Elev= 497.58' Surf.Area= 95 sf Storage= 294 cf Plug-Flow detention time= (not calculated) Center-of-Mass det. time= (not calculated) Volume Invert Avail.Storage Storage Description #1 492.58' 94 cf Custom Stage Data (Prismatic)Listed below (Recalc) 435 cf Overall - 200 cf Embedded = 235 cf x 40.0% Voids #2 493.58' 200 cf Precast Unit (Prismatic)Listed below (Recalc) Inside #1 294 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 492.58 79 0 0 497.58 95 435 435 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 493.58 50 0 0 497.58 50 200 200 Device Routing Invert Outlet Devices #1 Discarded 0.00' 99.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=0.00' (Free Discharge) L1=Exfiltration ( Controls 0.00 cfs) 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 34 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond IT2: Drywell Capacity Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) 492.58 0.00 495.23 0.20 492.63 0.18 495.28 0.20 492.68 0.18 495.33 0.20 492.73 0.18 495.38 0.20 492.78 0.18 495.43 0.20 492.83 0.18 495.48 0.20 492.88 0.18 495.53 0.20 492.93 0.18 495.58 0.20 492.98 0.18 495.63 0.20 493.03 0.18 495.68 0.20 493.08 0.18 495.73 0.20 493.13 0.19 495.78 0.20 493.18 0.19 495.83 0.20 493.23 0.19 495.88 0.21 493.28 0.19 495.93 0.21 493.33 0.19 495.98 0.21 493.38 0.19 496.03 0.21 493.43 0.19 496.08 0.21 493.48 0.19 496.13 0.21 493.53 0.19 496.18 0.21 493.58 0.19 496.23 0.21 493.63 0.19 496.28 0.21 493.68 0.19 496.33 0.21 493.73 0.19 496.38 0.21 493.78 0.19 496.43 0.21 493.83 0.19 496.48 0.21 493.88 0.19 496.53 0.21 493.93 0.19 496.58 0.21 493.98 0.19 496.63 0.21 494.03 0.19 496.68 0.21 494.08 0.19 496.73 0.21 494.13 0.19 496.78 0.21 494.18 0.19 496.83 0.21 494.23 0.19 496.88 0.21 494.28 0.19 496.93 0.21 494.33 0.19 496.98 0.21 494.38 0.19 497.03 0.21 494.43 0.19 497.08 0.21 494.48 0.19 497.13 0.21 494.53 0.20 497.18 0.21 494.58 0.20 497.23 0.22 494.63 0.20 497.28 0.22 494.68 0.20 497.33 0.22 494.73 0.20 497.38 0.22 494.78 0.20 497.43 0.22 494.83 0.20 497.48 0.22 494.88 0.20 497.53 0.22 494.93 0.20 497.58 0.22 494.98 0.20 495.03 0.20 495.08 0.20 495.13 0.20 495.18 0.20 1140 MIW Drainage Type // 24-hr 2-Year Rainfall=2.75" Prepared by {enter your company name here} Page 35 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond IT2: Drywell Capacity Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 492.58 79 0 495.23 87 138 492.63 79 2 495.28 88 141 492.68 79 3 495.33 88 144 492.73 79 5 495.38 88 147 492.78 80 6 495.43 88 151 492.83 80 8 495.48 88 154 492.88 80 10 495.53 88 157 492.93 80 11 495.58 89 161 492.98 80 13 495.63 89 164 493.03 80 14 495.68 89 167 493.08 81 16 495.73 89 170 493.13 81 18 495.78 89 174 493.18 81 19 495.83 89 177 493.23 81 21 495.88 90 180 493.28 81 22 495.93 90 184 493.33 81 24 495.98 90 187 493.38 82 26 496.03 90 190 493.43 82 27 496.08 90 193 493.48 82 29 496.13 90 197 493.53 82 31 496.18 91 200 493.58 82 32 496.23 91 203 493.63 82 35 496.28 91 207 493.68 83 39 496.33 91 210 493.73 83 42 496.38 91 213 493.78 83 45 496.43 91 217 493.83 83 48 496.48 91 220 493.88 83 51 496.53 92 223 493.93 83 54 496.58 92 227 493.98 83 57 496.63 92 230 494.03 84 61 496.68 92 233 494.08 84 64 496.73 92 237 494.13 84 67 496.78 92 240 494.18 84 70 496.83 93 243 494.23 84 73 496.88 93 247 494.28 84 77 496.93 93 250 494.33 85 80 496.98 93 253 494.38 85 83 497.03 93 257 494.43 85 86 497.08 93 260 494.48 85 89 497.13 94 264 494.53 85 93 497.18 94 267 494.58 85 96 497.23 94 270 494.63 86 99 497.28 94 274 494.68 86 102 497.33 94 277 494.73 86 105 497.38 94 280 494.78 86 109 497.43 95 284 494.83 86 112 497.48 95 287 494.88 86 115 497.53 95 291 494.93 87 118 497.58 95 294 494.98 87 122 495.03 87 125 495.08 87 128 495.13 87 131 495.18 87 134 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 36 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment E1: Pre-Development Runoff(Remains On SitdRunoff Area=81,116 sf Runoff Depth=0.00" Flow Length=340' Tc=32.8 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment E2: Pre-Development Runoff(Discharges OffsRunoff Area=69,883 sf Runoff Depth=0.00" Flow Length=365' Tc=39.7 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment E3: Pre-Development Runoff(Discharges OffRunoff Area=124,045 sf Runoff Depth=0.00" Flow Length=540' Tc=68.0 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P1: Post-Development Runoff to I131 (RemainsRunoff Area=54,840 sf Runoff Depth=0.14" Flow Length=238' Tc=24.3 min CN=45 Runoff=0.02 cfs 0.014 of Subcatchment P2: Post-Development Runoff(Undisturbed AiRunoff Area=35,553 sf Runoff Depth=0.00" Flow Length=160' Tc=19.4 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P3: Post Development Runoff(Undisturbed AiRunoff Area=79,206 sf Runoff Depth=0.00" Flow Length=254' Tc=43.2 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P4: Post-Development Runoff(Remains On SRunoff Area=105,334 sf Runoff Depth=0.81" Flow Length=448' Tc=31.5 min CN=63 Runoff=1.33 cfs 0.163 of Pond 1P: I131 Peak Elev=499.13' Storage=618 cf Inflow=0.02 cfs 0.014 of Outflow=0.00 cfs 0.000 of Pond 2P: I132 Peak EIev=498.50' Storage=4,675 cf Inflow=1.33 cfs 0.163 of Outflow=0.12 cfs 0.057 of Pond IT2: Drywell Capacity Peak EIev=0.00' Storage=0 cf Discarded=0.00 cfs 0.000 of Total Runoff Area = 12.626 ac Runoff Volume = 0.178 of Average Runoff Depth = 0.17" 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 37 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E1: Pre-Development Runoff (Remains On Site) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 10-Year Rainfall=3.80" Area (sf) CN Description 81,116 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 27.5 144 0.0270 0.1 Sheet Flow, SFE1 Woods: Light underbrush n= 0.400 P2= 2.75" 5.3 196 0.0150 0.6 Shallow Concentrated Flow, SCFE1 Woodland Kv= 5.0 fps 32.8 340 Total 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 38 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E2: Pre-Development Runoff (Discharges Offsite to North) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 10-Year Rainfall=3.80" Area (sf) CN Description 69,883 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.3 95 0.0100 0.1 Sheet Flow, SFE2 Woods: Light underbrush n= 0.400 P2= 2.75" 10.4 270 0.0075 0.4 Shallow Concentrated Flow, SCFE2 Woodland Kv= 5.0 fps 39.7 365 Total 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 39 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E3: Pre-Development Runoff (Discharges Offsite to South) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 10-Year Rainfall=3.80" Area (sf) CN Description 124,045 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 49.6 150 0.0067 0.1 Sheet Flow, SFE3 Woods: Light underbrush n= 0.400 P2= 2.75" 18.4 390 0.0050 0.4 Shallow Concentrated Flow, SCFE3 Woodland Kv= 5.0 fps 68.0 540 Total 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 40 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P1: Post-Development Runoff to 1131 (Remains On Site) Runoff = 0.02 cfs @ 12.77 hrs, Volume= 0.014 af, Depth= 0.14" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 10-Year Rainfall=3.80" Area (sf) CN Description 30,315 30 Woods, Good, HSG A 14,696 39 >75% Grass cover, Good, HSG A 9,829 98 Paved parking & roofs 54,840 45 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 100 0.0270 0.1 Sheet Flow, SFP1 Woods: Light underbrush n= 0.400 P2= 2.75" 3.8 138 0.0150 0.6 Shallow Concentrated Flow, SCFP1 Woodland Kv= 5.0 fps 24.3 238 Total 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 41 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P2: Post-Development Runoff (Undisturbed Area Discharges Offsite to North) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 10-Year Rainfall=3.80" Area (sf) CN Description 35,553 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.1 50 0.0125 0.1 Sheet Flow, SFP2 Woods: Light underbrush n= 0.400 P2= 2.75" 3.3 110 0.0125 0.6 Shallow Concentrated Flow, SCFP2 Woodland Kv= 5.0 fps 19.4 160 Total 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 42 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P3: Post Development Runoff (Undisturbed Area Discharges Offsite to South) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 10-Year Rainfall=3.80" Area (sf) CN Description 79,206 30 Forest Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 35.9 100 0.0067 0.0 Sheet Flow, SFP3 Woods: Light underbrush n= 0.400 P2= 2.75" 7.3 154 0.0050 0.4 Shallow Concentrated Flow, SCFP3 Woodland Kv= 5.0 fps 43.2 254 Total 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 43 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P4: Post-Development Runoff (Remains On Site) Runoff = 1.33 cfs @ 12.29 hrs, Volume= 0.163 af, Depth= 0.81" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 10-Year Rainfall=3.80" Area (sf) CN Description 33,354 30 Woods, Good, HSG A 48,548 98 Paved parking & roofs 23,432 39 >75% Grass cover, Good, HSG A 105,334 63 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 72 0.0140 0.1 Sheet Flow, SFP4 Woods: Light underbrush n= 0.400 P2= 2.75" 11.0 376 0.0130 0.6 Shallow Concentrated Flow, SCFP4 Woodland Kv= 5.0 fps 31.5 448 Total 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 44 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond 1P: 1B1 Inflow Area = 1.259 ac, Inflow Depth = 0.14" for 10-Year event Inflow = 0.02 cfs @ 12.77 hrs, Volume= 0.014 of Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 100%, Lag= 0.0 min Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 499.13' @ 25.39 hrs Surf.Area= 1,155 sf Storage= 618 cf Flood Elev= 500.50' Surf.Area= 2,452 sf Storage= 2,184 cf Plug-Flow detention time= (not calculated: initial storage excedes outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 498.00' 2,184 cf I1131 (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 498.00 0 0 0 499.00 958 479 479 500.00 2,452 1,705 2,184 Device Routing Invert Outlet Devices #1 Discarded 499.55' 0.36 cfs Exfiltration when above invert Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=498.00' (Free Discharge) L1=Exfiltration ( Controls 0.00 cfs) 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 45 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond 1 P: 1B1 Elevation Discarded Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) (feet) (cfs) 498.00 0.00 499.06 0.00 500.12 0.36 498.02 0.00 499.08 0.00 500.14 0.36 498.04 0.00 499.10 0.00 500.16 0.36 498.06 0.00 499.12 0.00 500.18 0.36 498.08 0.00 499.14 0.00 500.20 0.36 498.10 0.00 499.16 0.00 500.22 0.36 498.12 0.00 499.18 0.00 500.24 0.36 498.14 0.00 499.20 0.00 500.26 0.36 498.16 0.00 499.22 0.00 500.28 0.36 498.18 0.00 499.24 0.00 500.30 0.36 498.20 0.00 499.26 0.00 500.32 0.36 498.22 0.00 499.28 0.00 500.34 0.36 498.24 0.00 499.30 0.00 500.36 0.36 498.26 0.00 499.32 0.00 500.38 0.36 498.28 0.00 499.34 0.00 500.40 0.36 498.30 0.00 499.36 0.00 500.42 0.36 498.32 0.00 499.38 0.00 500.44 0.36 498.34 0.00 499.40 0.00 500.46 0.36 498.36 0.00 499.42 0.00 500.48 0.36 498.38 0.00 499.44 0.00 500.50 0.36 498.40 0.00 499.46 0.00 498.42 0.00 499.48 0.00 498.44 0.00 499.50 0.00 498.46 0.00 499.52 0.00 498.48 0.00 499.54 0.00 498.50 0.00 499.56 0.36 498.52 0.00 499.58 0.36 498.54 0.00 499.60 0.36 498.56 0.00 499.62 0.36 498.58 0.00 499.64 0.36 498.60 0.00 499.66 0.36 498.62 0.00 499.68 0.36 498.64 0.00 499.70 0.36 498.66 0.00 499.72 0.36 498.68 0.00 499.74 0.36 498.70 0.00 499.76 0.36 498.72 0.00 499.78 0.36 498.74 0.00 499.80 0.36 498.76 0.00 499.82 0.36 498.78 0.00 499.84 0.36 498.80 0.00 499.86 0.36 498.82 0.00 499.88 0.36 498.84 0.00 499.90 0.36 498.86 0.00 499.92 0.36 498.88 0.00 499.94 0.36 498.90 0.00 499.96 0.36 498.92 0.00 499.98 0.36 498.94 0.00 500.00 0.36 498.96 0.00 500.02 0.36 498.98 0.00 500.04 0.36 499.00 0.00 500.06 0.36 499.02 0.00 500.08 0.36 499.04 0.00 500.10 0.36 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 46 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond 1 P: 1B1 Elevation Surface Storage (feet) (sq-ft) (cubic-feet) 498.00 0 0 498.05 48 1 498.10 96 5 498.15 144 11 498.20 192 19 498.25 240 30 498.30 287 43 498.35 335 59 498.40 383 77 498.45 431 97 498.50 479 120 498.55 527 145 498.60 575 172 498.65 623 202 498.70 671 235 498.75 719 269 498.80 766 307 498.85 814 346 498.90 862 388 498.95 910 432 499.00 958 479 499.05 1,033 529 499.10 1,107 582 499.15 1,182 640 499.20 1,257 700 499.25 1,332 765 499.30 1,406 834 499.35 1,481 906 499.40 1,556 982 499.45 1,630 1,061 499.50 1,705 1,145 499.55 1,780 1,232 499.60 1,854 1,323 499.65 1,929 1,417 499.70 2,004 1,516 499.75 2,079 1,618 499.80 2,153 1,723 499.85 2,228 1,833 499.90 2,303 1,946 499.95 2,377 2,063 500.00 2,452 2,184 500.05 2,452 2,184 500.10 2,452 2,184 500.15 2,452 2,184 500.20 2,452 2,184 500.25 2,452 2,184 500.30 2,452 2,184 500.35 2,452 2,184 500.40 2,452 2,184 500.45 2,452 2,184 500.50 2,452 2,184 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 47 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond 2P: 1B2 Inflow Area = 2.418 ac, Inflow Depth = 0.81" for 10-Year event Inflow = 1.33 cfs @ 12.29 hrs, Volume= 0.163 of Outflow = 0.12 cfs @ 15.56 hrs, Volume= 0.057 af, Atten= 91%, Lag= 195.9 min Discarded = 0.12 cfs @ 15.56 hrs, Volume= 0.057 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 498.50' @ 15.56 hrs Surf.Area= 6,342 sf Storage= 4,675 cf Flood Elev= 499.50' Surf.Area= 8,557 sf Storage= 8,375 cf Plug-Flow detention time= 415.3 min calculated for 0.057 of(35% of inflow) Center-of-Mass det. time= 247.9 min ( 1,156.2 - 908.3 ) Volume Invert Avail.Storage Storage Description #1 497.00' 8,375 cf I1132 (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 497.00 0 0 0 498.00 4,096 2,048 2,048 499.00 8,557 6,327 8,375 Device Routing Invert Outlet Devices #1 Discarded 498.50' 0.90 cfs Exfiltration when above invert Discarded OutFlow Max=0.90 cfs @ 15.56 hrs HW=498.50' (Free Discharge) L1=Exfiltration (Exfiltration Controls 0.90 cfs) 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 48 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond 2P: 1B2 Elevation Discarded Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) (feet) (cfs) 497.00 0.00 498.06 0.00 499.12 0.90 497.02 0.00 498.08 0.00 499.14 0.90 497.04 0.00 498.10 0.00 499.16 0.90 497.06 0.00 498.12 0.00 499.18 0.90 497.08 0.00 498.14 0.00 499.20 0.90 497.10 0.00 498.16 0.00 499.22 0.90 497.12 0.00 498.18 0.00 499.24 0.90 497.14 0.00 498.20 0.00 499.26 0.90 497.16 0.00 498.22 0.00 499.28 0.90 497.18 0.00 498.24 0.00 499.30 0.90 497.20 0.00 498.26 0.00 499.32 0.90 497.22 0.00 498.28 0.00 499.34 0.90 497.24 0.00 498.30 0.00 499.36 0.90 497.26 0.00 498.32 0.00 499.38 0.90 497.28 0.00 498.34 0.00 499.40 0.90 497.30 0.00 498.36 0.00 499.42 0.90 497.32 0.00 498.38 0.00 499.44 0.90 497.34 0.00 498.40 0.00 499.46 0.90 497.36 0.00 498.42 0.00 499.48 0.90 497.38 0.00 498.44 0.00 499.50 0.90 497.40 0.00 498.46 0.00 497.42 0.00 498.48 0.00 497.44 0.00 498.50 0.00 497.46 0.00 498.52 0.90 497.48 0.00 498.54 0.90 497.50 0.00 498.56 0.90 497.52 0.00 498.58 0.90 497.54 0.00 498.60 0.90 497.56 0.00 498.62 0.90 497.58 0.00 498.64 0.90 497.60 0.00 498.66 0.90 497.62 0.00 498.68 0.90 497.64 0.00 498.70 0.90 497.66 0.00 498.72 0.90 497.68 0.00 498.74 0.90 497.70 0.00 498.76 0.90 497.72 0.00 498.78 0.90 497.74 0.00 498.80 0.90 497.76 0.00 498.82 0.90 497.78 0.00 498.84 0.90 497.80 0.00 498.86 0.90 497.82 0.00 498.88 0.90 497.84 0.00 498.90 0.90 497.86 0.00 498.92 0.90 497.88 0.00 498.94 0.90 497.90 0.00 498.96 0.90 497.92 0.00 498.98 0.90 497.94 0.00 499.00 0.90 497.96 0.00 499.02 0.90 497.98 0.00 499.04 0.90 498.00 0.00 499.06 0.90 498.02 0.00 499.08 0.90 498.04 0.00 499.10 0.90 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 49 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond 2P: 1B2 Elevation Surface Storage (feet) (sq-ft) (cubic-feet) 497.00 0 0 497.05 205 5 497.10 410 20 497.15 614 46 497.20 819 82 497.25 1,024 128 497.30 1,229 184 497.35 1,434 251 497.40 1,638 328 497.45 1,843 415 497.50 2,048 512 497.55 2,253 620 497.60 2,458 737 497.65 2,662 865 497.70 2,867 1,004 497.75 3,072 1,152 497.80 3,277 1,311 497.85 3,482 1,480 497.90 3,686 1,659 497.95 3,891 1,848 498.00 4,096 2,048 498.05 4,319 2,258 498.10 4,542 2,480 498.15 4,765 2,713 498.20 4,988 2,956 498.25 5,211 3,211 498.30 5,434 3,478 498.35 5,657 3,755 498.40 5,880 4,043 498.45 6,103 4,343 498.50 6,327 4,654 498.55 6,550 4,976 498.60 6,773 5,309 498.65 6,996 5,653 498.70 7,219 6,008 498.75 7,442 6,375 498.80 7,665 6,752 498.85 7,888 7,141 498.90 8,111 7,541 498.95 8,334 7,952 499.00 8,557 8,375 499.05 8,557 8,375 499.10 8,557 8,375 499.15 8,557 8,375 499.20 8,557 8,375 499.25 8,557 8,375 499.30 8,557 8,375 499.35 8,557 8,375 499.40 8,557 8,375 499.45 8,557 8,375 499.50 8,557 8,375 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 50 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond IT2: Drywell Capacity Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 0.00' @ 0.00 hrs Surf.Area= 0 sf Storage= 0 cf Flood Elev= 497.58' Surf.Area= 95 sf Storage= 294 cf Plug-Flow detention time= (not calculated) Center-of-Mass det. time= (not calculated) Volume Invert Avail.Storage Storage Description #1 492.58' 94 cf Custom Stage Data (Prismatic)Listed below (Recalc) 435 cf Overall - 200 cf Embedded = 235 cf x 40.0% Voids #2 493.58' 200 cf Precast Unit (Prismatic)Listed below (Recalc) Inside #1 294 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 492.58 79 0 0 497.58 95 435 435 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 493.58 50 0 0 497.58 50 200 200 Device Routing Invert Outlet Devices #1 Discarded 0.00' 99.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=0.00' (Free Discharge) L1=Exfiltration ( Controls 0.00 cfs) 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 51 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond IT2: Drywell Capacity Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) 492.58 0.00 495.23 0.20 492.63 0.18 495.28 0.20 492.68 0.18 495.33 0.20 492.73 0.18 495.38 0.20 492.78 0.18 495.43 0.20 492.83 0.18 495.48 0.20 492.88 0.18 495.53 0.20 492.93 0.18 495.58 0.20 492.98 0.18 495.63 0.20 493.03 0.18 495.68 0.20 493.08 0.18 495.73 0.20 493.13 0.19 495.78 0.20 493.18 0.19 495.83 0.20 493.23 0.19 495.88 0.21 493.28 0.19 495.93 0.21 493.33 0.19 495.98 0.21 493.38 0.19 496.03 0.21 493.43 0.19 496.08 0.21 493.48 0.19 496.13 0.21 493.53 0.19 496.18 0.21 493.58 0.19 496.23 0.21 493.63 0.19 496.28 0.21 493.68 0.19 496.33 0.21 493.73 0.19 496.38 0.21 493.78 0.19 496.43 0.21 493.83 0.19 496.48 0.21 493.88 0.19 496.53 0.21 493.93 0.19 496.58 0.21 493.98 0.19 496.63 0.21 494.03 0.19 496.68 0.21 494.08 0.19 496.73 0.21 494.13 0.19 496.78 0.21 494.18 0.19 496.83 0.21 494.23 0.19 496.88 0.21 494.28 0.19 496.93 0.21 494.33 0.19 496.98 0.21 494.38 0.19 497.03 0.21 494.43 0.19 497.08 0.21 494.48 0.19 497.13 0.21 494.53 0.20 497.18 0.21 494.58 0.20 497.23 0.22 494.63 0.20 497.28 0.22 494.68 0.20 497.33 0.22 494.73 0.20 497.38 0.22 494.78 0.20 497.43 0.22 494.83 0.20 497.48 0.22 494.88 0.20 497.53 0.22 494.93 0.20 497.58 0.22 494.98 0.20 495.03 0.20 495.08 0.20 495.13 0.20 495.18 0.20 1140 MIW Drainage Type 11 24-hr 10-Year Rainfall=3.80" Prepared by {enter your company name here} Page 52 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond IT2: Drywell Capacity Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 492.58 79 0 495.23 87 138 492.63 79 2 495.28 88 141 492.68 79 3 495.33 88 144 492.73 79 5 495.38 88 147 492.78 80 6 495.43 88 151 492.83 80 8 495.48 88 154 492.88 80 10 495.53 88 157 492.93 80 11 495.58 89 161 492.98 80 13 495.63 89 164 493.03 80 14 495.68 89 167 493.08 81 16 495.73 89 170 493.13 81 18 495.78 89 174 493.18 81 19 495.83 89 177 493.23 81 21 495.88 90 180 493.28 81 22 495.93 90 184 493.33 81 24 495.98 90 187 493.38 82 26 496.03 90 190 493.43 82 27 496.08 90 193 493.48 82 29 496.13 90 197 493.53 82 31 496.18 91 200 493.58 82 32 496.23 91 203 493.63 82 35 496.28 91 207 493.68 83 39 496.33 91 210 493.73 83 42 496.38 91 213 493.78 83 45 496.43 91 217 493.83 83 48 496.48 91 220 493.88 83 51 496.53 92 223 493.93 83 54 496.58 92 227 493.98 83 57 496.63 92 230 494.03 84 61 496.68 92 233 494.08 84 64 496.73 92 237 494.13 84 67 496.78 92 240 494.18 84 70 496.83 93 243 494.23 84 73 496.88 93 247 494.28 84 77 496.93 93 250 494.33 85 80 496.98 93 253 494.38 85 83 497.03 93 257 494.43 85 86 497.08 93 260 494.48 85 89 497.13 94 264 494.53 85 93 497.18 94 267 494.58 85 96 497.23 94 270 494.63 86 99 497.28 94 274 494.68 86 102 497.33 94 277 494.73 86 105 497.38 94 280 494.78 86 109 497.43 95 284 494.83 86 112 497.48 95 287 494.88 86 115 497.53 95 291 494.93 87 118 497.58 95 294 494.98 87 122 495.03 87 125 495.08 87 128 495.13 87 131 495.18 87 134 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 53 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment E1: Pre-Development Runoff(Remains On SitdRunoff Area=81,116 sf Runoff Depth=0.00" Flow Length=340' Tc=32.8 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment E2: Pre-Development Runoff(Discharges OffsRunoff Area=69,883 sf Runoff Depth=0.00" Flow Length=365' Tc=39.7 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment E3: Pre-Development Runoff(Discharges OffRunoff Area=124,045 sf Runoff Depth=0.00" Flow Length=540' Tc=68.0 min CN=30 Runoff=0.00 cfs 0.001 of Subcatchment P1: Post-Development Runoff to I131 (RemainsRunoff Area=54,840 sf Runoff Depth=0.41" Flow Length=238' Tc=24.3 min CN=45 Runoff=0.21 cfs 0.043 of Subcatchment P2: Post-Development Runoff(Undisturbed AiRunoff Area=35,553 sf Runoff Depth=0.00" Flow Length=160' Tc=19.4 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P3: Post Development Runoff(Undisturbed AiRunoff Area=79,206 sf Runoff Depth=0.00" Flow Length=254' Tc=43.2 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P4: Post-Development Runoff(Remains On SRunoff Area=105,334 sf Runoff Depth=1.45" Flow Length=448' Tc=31.5 min CN=63 Runoff=2.67 cfs 0.291 of Pond 1P: I131 Peak Elev=499.55' Storage=1,236 cf Inflow=0.21 cfs 0.043 of Outflow=0.03 cfs 0.015 of Pond 2P: I132 Peak Elev=498.54' Storage=4,941 cf Inflow=2.67 cfs 0.291 of Outflow=0.90 cfs 0.185 of Pond IT2: Drywell Capacity Peak Elev=0.00' Storage=0 cf Discarded=0.00 cfs 0.000 of Total Runoff Area = 12.626 ac Runoff Volume = 0.336 of Average Runoff Depth = 0.32" 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 54 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E1: Pre-Development Runoff (Remains On Site) Runoff = 0.00 cfs @ 24.09 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 50-Year Rainfall=4.90" Area (sf) CN Description 81,116 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 27.5 144 0.0270 0.1 Sheet Flow, SFE1 Woods: Light underbrush n= 0.400 P2= 2.75" 5.3 196 0.0150 0.6 Shallow Concentrated Flow, SCFE1 Woodland Kv= 5.0 fps 32.8 340 Total 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 55 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E2: Pre-Development Runoff (Discharges Offsite to North) Runoff = 0.00 cfs @ 24.13 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 50-Year Rainfall=4.90" Area (sf) CN Description 69,883 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.3 95 0.0100 0.1 Sheet Flow, SFE2 Woods: Light underbrush n= 0.400 P2= 2.75" 10.4 270 0.0075 0.4 Shallow Concentrated Flow, SCFE2 Woodland Kv= 5.0 fps 39.7 365 Total 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 56 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E3: Pre-Development Runoff (Discharges Offsite to South) Runoff = 0.00 cfs @ 24.32 hrs, Volume= 0.001 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 50-Year Rainfall=4.90" Area (sf) CN Description 124,045 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 49.6 150 0.0067 0.1 Sheet Flow, SFE3 Woods: Light underbrush n= 0.400 P2= 2.75" 18.4 390 0.0050 0.4 Shallow Concentrated Flow, SCFE3 Woodland Kv= 5.0 fps 68.0 540 Total 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 57 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P1: Post-Development Runoff to 1131 (Remains On Site) Runoff = 0.21 cfs @ 12.29 hrs, Volume= 0.043 af, Depth= 0.41" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 50-Year Rainfall=4.90" Area (sf) CN Description 30,315 30 Woods, Good, HSG A 14,696 39 >75% Grass cover, Good, HSG A 9,829 98 Paved parking & roofs 54,840 45 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 100 0.0270 0.1 Sheet Flow, SFP1 Woods: Light underbrush n= 0.400 P2= 2.75" 3.8 138 0.0150 0.6 Shallow Concentrated Flow, SCFP1 Woodland Kv= 5.0 fps 24.3 238 Total 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 58 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P2: Post-Development Runoff (Undisturbed Area Discharges Offsite to North) Runoff = 0.00 cfs @ 24.04 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 50-Year Rainfall=4.90" Area (sf) CN Description 35,553 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.1 50 0.0125 0.1 Sheet Flow, SFP2 Woods: Light underbrush n= 0.400 P2= 2.75" 3.3 110 0.0125 0.6 Shallow Concentrated Flow, SCFP2 Woodland Kv= 5.0 fps 19.4 160 Total 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 59 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P3: Post Development Runoff (Undisturbed Area Discharges Offsite to South) Runoff = 0.00 cfs @ 24.15 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 50-Year Rainfall=4.90" Area (sf) CN Description 79,206 30 Forest Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 35.9 100 0.0067 0.0 Sheet Flow, SFP3 Woods: Light underbrush n= 0.400 P2= 2.75" 7.3 154 0.0050 0.4 Shallow Concentrated Flow, SCFP3 Woodland Kv= 5.0 fps 43.2 254 Total 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 60 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P4: Post-Development Runoff (Remains On Site) Runoff = 2.67 cfs @ 12.29 hrs, Volume= 0.291 af, Depth= 1.45" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 50-Year Rainfall=4.90" Area (sf) CN Description 33,354 30 Woods, Good, HSG A 48,548 98 Paved parking & roofs 23,432 39 >75% Grass cover, Good, HSG A 105,334 63 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 72 0.0140 0.1 Sheet Flow, SFP4 Woods: Light underbrush n= 0.400 P2= 2.75" 11.0 376 0.0130 0.6 Shallow Concentrated Flow, SCFP4 Woodland Kv= 5.0 fps 31.5 448 Total 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 61 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond 1P: 1B1 Inflow Area = 1.259 ac, Inflow Depth = 0.41" for 50-Year event Inflow = 0.21 cfs @ 12.29 hrs, Volume= 0.043 of Outflow = 0.03 cfs @ 17.39 hrs, Volume= 0.015 af, Atten= 84%, Lag= 305.8 min Discarded = 0.03 cfs @ 17.39 hrs, Volume= 0.015 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 499.55' @ 17.39 hrs Surf.Area= 1,783 sf Storage= 1,236 cf Flood Elev= 500.50' Surf.Area= 2,452 sf Storage= 2,184 cf Plug-Flow detention time= 471.4 min calculated for 0.015 of(34% of inflow) Center-of-Mass det. time= 263.2 min ( 1,231.3 - 968.1 ) Volume Invert Avail.Storage Storage Description #1 498.00' 2,184 cf I1131 (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 498.00 0 0 0 499.00 958 479 479 500.00 2,452 1,705 2,184 Device Routing Invert Outlet Devices #1 Discarded 499.55' 0.36 cfs Exfiltration when above invert Discarded OutFlow Max=0.36 cfs @ 17.39 hrs HW=499.55' (Free Discharge) L1=Exfiltration (Exfiltration Controls 0.36 cfs) 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 62 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond 1 P: 1B1 Elevation Discarded Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) (feet) (cfs) 498.00 0.00 499.06 0.00 500.12 0.36 498.02 0.00 499.08 0.00 500.14 0.36 498.04 0.00 499.10 0.00 500.16 0.36 498.06 0.00 499.12 0.00 500.18 0.36 498.08 0.00 499.14 0.00 500.20 0.36 498.10 0.00 499.16 0.00 500.22 0.36 498.12 0.00 499.18 0.00 500.24 0.36 498.14 0.00 499.20 0.00 500.26 0.36 498.16 0.00 499.22 0.00 500.28 0.36 498.18 0.00 499.24 0.00 500.30 0.36 498.20 0.00 499.26 0.00 500.32 0.36 498.22 0.00 499.28 0.00 500.34 0.36 498.24 0.00 499.30 0.00 500.36 0.36 498.26 0.00 499.32 0.00 500.38 0.36 498.28 0.00 499.34 0.00 500.40 0.36 498.30 0.00 499.36 0.00 500.42 0.36 498.32 0.00 499.38 0.00 500.44 0.36 498.34 0.00 499.40 0.00 500.46 0.36 498.36 0.00 499.42 0.00 500.48 0.36 498.38 0.00 499.44 0.00 500.50 0.36 498.40 0.00 499.46 0.00 498.42 0.00 499.48 0.00 498.44 0.00 499.50 0.00 498.46 0.00 499.52 0.00 498.48 0.00 499.54 0.00 498.50 0.00 499.56 0.36 498.52 0.00 499.58 0.36 498.54 0.00 499.60 0.36 498.56 0.00 499.62 0.36 498.58 0.00 499.64 0.36 498.60 0.00 499.66 0.36 498.62 0.00 499.68 0.36 498.64 0.00 499.70 0.36 498.66 0.00 499.72 0.36 498.68 0.00 499.74 0.36 498.70 0.00 499.76 0.36 498.72 0.00 499.78 0.36 498.74 0.00 499.80 0.36 498.76 0.00 499.82 0.36 498.78 0.00 499.84 0.36 498.80 0.00 499.86 0.36 498.82 0.00 499.88 0.36 498.84 0.00 499.90 0.36 498.86 0.00 499.92 0.36 498.88 0.00 499.94 0.36 498.90 0.00 499.96 0.36 498.92 0.00 499.98 0.36 498.94 0.00 500.00 0.36 498.96 0.00 500.02 0.36 498.98 0.00 500.04 0.36 499.00 0.00 500.06 0.36 499.02 0.00 500.08 0.36 499.04 0.00 500.10 0.36 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 63 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond 1 P: 1B1 Elevation Surface Storage (feet) (sq-ft) (cubic-feet) 498.00 0 0 498.05 48 1 498.10 96 5 498.15 144 11 498.20 192 19 498.25 240 30 498.30 287 43 498.35 335 59 498.40 383 77 498.45 431 97 498.50 479 120 498.55 527 145 498.60 575 172 498.65 623 202 498.70 671 235 498.75 719 269 498.80 766 307 498.85 814 346 498.90 862 388 498.95 910 432 499.00 958 479 499.05 1,033 529 499.10 1,107 582 499.15 1,182 640 499.20 1,257 700 499.25 1,332 765 499.30 1,406 834 499.35 1,481 906 499.40 1,556 982 499.45 1,630 1,061 499.50 1,705 1,145 499.55 1,780 1,232 499.60 1,854 1,323 499.65 1,929 1,417 499.70 2,004 1,516 499.75 2,079 1,618 499.80 2,153 1,723 499.85 2,228 1,833 499.90 2,303 1,946 499.95 2,377 2,063 500.00 2,452 2,184 500.05 2,452 2,184 500.10 2,452 2,184 500.15 2,452 2,184 500.20 2,452 2,184 500.25 2,452 2,184 500.30 2,452 2,184 500.35 2,452 2,184 500.40 2,452 2,184 500.45 2,452 2,184 500.50 2,452 2,184 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 64 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond 2P: 1B2 Inflow Area = 2.418 ac, Inflow Depth = 1.45" for 50-Year event Inflow = 2.67 cfs @ 12.29 hrs, Volume= 0.291 of Outflow = 0.90 cfs @ 12.65 hrs, Volume= 0.185 af, Atten= 66%, Lag= 21.8 min Discarded = 0.90 cfs @ 12.65 hrs, Volume= 0.185 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 498.54' @ 12.83 hrs Surf.Area= 6,526 sf Storage= 4,941 cf Flood Elev= 499.50' Surf.Area= 8,557 sf Storage= 8,375 cf Plug-Flow detention time= 217.8 min calculated for 0.185 of(63% of inflow) Center-of-Mass det. time= 90.7 min ( 978.9 - 888.2 ) Volume Invert Avail.Storage Storage Description #1 497.00' 8,375 cf I1132 (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 497.00 0 0 0 498.00 4,096 2,048 2,048 499.00 8,557 6,327 8,375 Device Routing Invert Outlet Devices #1 Discarded 498.50' 0.90 cfs Exfiltration when above invert Discarded OutFlow Max=0.90 cfs @ 12.65 hrs HW=498.53' (Free Discharge) L1=Exfiltration (Exfiltration Controls 0.90 cfs) 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 65 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond 2P: 1B2 Elevation Discarded Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) (feet) (cfs) 497.00 0.00 498.06 0.00 499.12 0.90 497.02 0.00 498.08 0.00 499.14 0.90 497.04 0.00 498.10 0.00 499.16 0.90 497.06 0.00 498.12 0.00 499.18 0.90 497.08 0.00 498.14 0.00 499.20 0.90 497.10 0.00 498.16 0.00 499.22 0.90 497.12 0.00 498.18 0.00 499.24 0.90 497.14 0.00 498.20 0.00 499.26 0.90 497.16 0.00 498.22 0.00 499.28 0.90 497.18 0.00 498.24 0.00 499.30 0.90 497.20 0.00 498.26 0.00 499.32 0.90 497.22 0.00 498.28 0.00 499.34 0.90 497.24 0.00 498.30 0.00 499.36 0.90 497.26 0.00 498.32 0.00 499.38 0.90 497.28 0.00 498.34 0.00 499.40 0.90 497.30 0.00 498.36 0.00 499.42 0.90 497.32 0.00 498.38 0.00 499.44 0.90 497.34 0.00 498.40 0.00 499.46 0.90 497.36 0.00 498.42 0.00 499.48 0.90 497.38 0.00 498.44 0.00 499.50 0.90 497.40 0.00 498.46 0.00 497.42 0.00 498.48 0.00 497.44 0.00 498.50 0.00 497.46 0.00 498.52 0.90 497.48 0.00 498.54 0.90 497.50 0.00 498.56 0.90 497.52 0.00 498.58 0.90 497.54 0.00 498.60 0.90 497.56 0.00 498.62 0.90 497.58 0.00 498.64 0.90 497.60 0.00 498.66 0.90 497.62 0.00 498.68 0.90 497.64 0.00 498.70 0.90 497.66 0.00 498.72 0.90 497.68 0.00 498.74 0.90 497.70 0.00 498.76 0.90 497.72 0.00 498.78 0.90 497.74 0.00 498.80 0.90 497.76 0.00 498.82 0.90 497.78 0.00 498.84 0.90 497.80 0.00 498.86 0.90 497.82 0.00 498.88 0.90 497.84 0.00 498.90 0.90 497.86 0.00 498.92 0.90 497.88 0.00 498.94 0.90 497.90 0.00 498.96 0.90 497.92 0.00 498.98 0.90 497.94 0.00 499.00 0.90 497.96 0.00 499.02 0.90 497.98 0.00 499.04 0.90 498.00 0.00 499.06 0.90 498.02 0.00 499.08 0.90 498.04 0.00 499.10 0.90 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 66 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond 2P: 1B2 Elevation Surface Storage (feet) (sq-ft) (cubic-feet) 497.00 0 0 497.05 205 5 497.10 410 20 497.15 614 46 497.20 819 82 497.25 1,024 128 497.30 1,229 184 497.35 1,434 251 497.40 1,638 328 497.45 1,843 415 497.50 2,048 512 497.55 2,253 620 497.60 2,458 737 497.65 2,662 865 497.70 2,867 1,004 497.75 3,072 1,152 497.80 3,277 1,311 497.85 3,482 1,480 497.90 3,686 1,659 497.95 3,891 1,848 498.00 4,096 2,048 498.05 4,319 2,258 498.10 4,542 2,480 498.15 4,765 2,713 498.20 4,988 2,956 498.25 5,211 3,211 498.30 5,434 3,478 498.35 5,657 3,755 498.40 5,880 4,043 498.45 6,103 4,343 498.50 6,327 4,654 498.55 6,550 4,976 498.60 6,773 5,309 498.65 6,996 5,653 498.70 7,219 6,008 498.75 7,442 6,375 498.80 7,665 6,752 498.85 7,888 7,141 498.90 8,111 7,541 498.95 8,334 7,952 499.00 8,557 8,375 499.05 8,557 8,375 499.10 8,557 8,375 499.15 8,557 8,375 499.20 8,557 8,375 499.25 8,557 8,375 499.30 8,557 8,375 499.35 8,557 8,375 499.40 8,557 8,375 499.45 8,557 8,375 499.50 8,557 8,375 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 67 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond IT2: Drywell Capacity Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 0.00' @ 0.00 hrs Surf.Area= 0 sf Storage= 0 cf Flood Elev= 497.58' Surf.Area= 95 sf Storage= 294 cf Plug-Flow detention time= (not calculated) Center-of-Mass det. time= (not calculated) Volume Invert Avail.Storage Storage Description #1 492.58' 94 cf Custom Stage Data (Prismatic)Listed below (Recalc) 435 cf Overall - 200 cf Embedded = 235 cf x 40.0% Voids #2 493.58' 200 cf Precast Unit (Prismatic)Listed below (Recalc) Inside #1 294 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 492.58 79 0 0 497.58 95 435 435 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 493.58 50 0 0 497.58 50 200 200 Device Routing Invert Outlet Devices #1 Discarded 0.00' 99.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=0.00' (Free Discharge) L1=Exfiltration ( Controls 0.00 cfs) 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 68 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond IT2: Drywell Capacity Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) 492.58 0.00 495.23 0.20 492.63 0.18 495.28 0.20 492.68 0.18 495.33 0.20 492.73 0.18 495.38 0.20 492.78 0.18 495.43 0.20 492.83 0.18 495.48 0.20 492.88 0.18 495.53 0.20 492.93 0.18 495.58 0.20 492.98 0.18 495.63 0.20 493.03 0.18 495.68 0.20 493.08 0.18 495.73 0.20 493.13 0.19 495.78 0.20 493.18 0.19 495.83 0.20 493.23 0.19 495.88 0.21 493.28 0.19 495.93 0.21 493.33 0.19 495.98 0.21 493.38 0.19 496.03 0.21 493.43 0.19 496.08 0.21 493.48 0.19 496.13 0.21 493.53 0.19 496.18 0.21 493.58 0.19 496.23 0.21 493.63 0.19 496.28 0.21 493.68 0.19 496.33 0.21 493.73 0.19 496.38 0.21 493.78 0.19 496.43 0.21 493.83 0.19 496.48 0.21 493.88 0.19 496.53 0.21 493.93 0.19 496.58 0.21 493.98 0.19 496.63 0.21 494.03 0.19 496.68 0.21 494.08 0.19 496.73 0.21 494.13 0.19 496.78 0.21 494.18 0.19 496.83 0.21 494.23 0.19 496.88 0.21 494.28 0.19 496.93 0.21 494.33 0.19 496.98 0.21 494.38 0.19 497.03 0.21 494.43 0.19 497.08 0.21 494.48 0.19 497.13 0.21 494.53 0.20 497.18 0.21 494.58 0.20 497.23 0.22 494.63 0.20 497.28 0.22 494.68 0.20 497.33 0.22 494.73 0.20 497.38 0.22 494.78 0.20 497.43 0.22 494.83 0.20 497.48 0.22 494.88 0.20 497.53 0.22 494.93 0.20 497.58 0.22 494.98 0.20 495.03 0.20 495.08 0.20 495.13 0.20 495.18 0.20 1140 MIW Drainage Type // 24-hr 50-Year Rainfall=4.90" Prepared by {enter your company name here} Page 69 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond IT2: Drywell Capacity Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 492.58 79 0 495.23 87 138 492.63 79 2 495.28 88 141 492.68 79 3 495.33 88 144 492.73 79 5 495.38 88 147 492.78 80 6 495.43 88 151 492.83 80 8 495.48 88 154 492.88 80 10 495.53 88 157 492.93 80 11 495.58 89 161 492.98 80 13 495.63 89 164 493.03 80 14 495.68 89 167 493.08 81 16 495.73 89 170 493.13 81 18 495.78 89 174 493.18 81 19 495.83 89 177 493.23 81 21 495.88 90 180 493.28 81 22 495.93 90 184 493.33 81 24 495.98 90 187 493.38 82 26 496.03 90 190 493.43 82 27 496.08 90 193 493.48 82 29 496.13 90 197 493.53 82 31 496.18 91 200 493.58 82 32 496.23 91 203 493.63 82 35 496.28 91 207 493.68 83 39 496.33 91 210 493.73 83 42 496.38 91 213 493.78 83 45 496.43 91 217 493.83 83 48 496.48 91 220 493.88 83 51 496.53 92 223 493.93 83 54 496.58 92 227 493.98 83 57 496.63 92 230 494.03 84 61 496.68 92 233 494.08 84 64 496.73 92 237 494.13 84 67 496.78 92 240 494.18 84 70 496.83 93 243 494.23 84 73 496.88 93 247 494.28 84 77 496.93 93 250 494.33 85 80 496.98 93 253 494.38 85 83 497.03 93 257 494.43 85 86 497.08 93 260 494.48 85 89 497.13 94 264 494.53 85 93 497.18 94 267 494.58 85 96 497.23 94 270 494.63 86 99 497.28 94 274 494.68 86 102 497.33 94 277 494.73 86 105 497.38 94 280 494.78 86 109 497.43 95 284 494.83 86 112 497.48 95 287 494.88 86 115 497.53 95 291 494.93 87 118 497.58 95 294 494.98 87 122 495.03 87 125 495.08 87 128 495.13 87 131 495.18 87 134 1140 MIW Drainage Type 1124-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 70 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment E1: Pre-Development Runoff(Remains On SitdRunoff Area=81,116 sf Runoff Depth=0.00" Flow Length=340' Tc=32.8 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment E2: Pre-Development Runoff(Discharges OffsRunoff Area=69,883 sf Runoff Depth=0.00" Flow Length=365' Tc=39.7 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment E3: Pre-Development Runoff(Discharges OffRunoff Area=124,045 sf Runoff Depth=0.00" Flow Length=540' Tc=68.0 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P1: Post-Development Runoff to I131 (RemainsRunoff Area=54,840 sf Runoff Depth=0.00" Flow Length=238' Tc=24.3 min CN=45 Runoff=0.00 cfs 0.000 of Subcatchment P2: Post-Development Runoff(Undisturbed AiRunoff Area=35,553 sf Runoff Depth=0.00" Flow Length=160' Tc=19.4 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P3: Post Development Runoff(Undisturbed AiRunoff Area=79,206 sf Runoff Depth=0.00" Flow Length=254' Tc=43.2 min CN=30 Runoff=0.00 cfs 0.000 of Subcatchment P4: Post-Development Runoff(Remains On SRunoff Area=105,334 sf Runoff Depth=0.00" Flow Length=448' Tc=31.5 min CN=63 Runoff=0.00 cfs 0.000 of Pond 1P: I131 Peak EIev=498.00' Storage=0 cf Inflow=0.00 cfs 0.000 of Outflow=0.00 cfs 0.000 of Pond 2P: I132 Peak EIev=497.02' Storage=1 cf Inflow=0.00 cfs 0.000 of Outflow=0.00 cfs 0.000 of Pond IT2: Drywell Capacity Peak EIev=0.00' Storage=0 cf Discarded=0.00 cfs 0.000 of Total Runoff Area = 12.626 ac Runoff Volume = 0.000 of Average Runoff Depth = 0.00" 1140 MIW Drainage Type // 24-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 71 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E1: Pre-Development Runoff (Remains On Site) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 90% Rainfall Rainfall=1.20" Area (sf) CN Description 81,116 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 27.5 144 0.0270 0.1 Sheet Flow, SFE1 Woods: Light underbrush n= 0.400 P2= 2.75" 5.3 196 0.0150 0.6 Shallow Concentrated Flow, SCFE1 Woodland Kv= 5.0 fps 32.8 340 Total 1140 MIW Drainage Type // 24-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 72 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E2: Pre-Development Runoff (Discharges Offsite to North) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 90% Rainfall Rainfall=1.20" Area (sf) CN Description 69,883 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.3 95 0.0100 0.1 Sheet Flow, SFE2 Woods: Light underbrush n= 0.400 P2= 2.75" 10.4 270 0.0075 0.4 Shallow Concentrated Flow, SCFE2 Woodland Kv= 5.0 fps 39.7 365 Total 1140 MIW Drainage Type // 24-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 73 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E3: Pre-Development Runoff (Discharges Offsite to South) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 90% Rainfall Rainfall=1.20" Area (sf) CN Description 124,045 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 49.6 150 0.0067 0.1 Sheet Flow, SFE3 Woods: Light underbrush n= 0.400 P2= 2.75" 18.4 390 0.0050 0.4 Shallow Concentrated Flow, SCFE3 Woodland Kv= 5.0 fps 68.0 540 Total 1140 MIW Drainage Type // 24-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 74 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P1: Post-Development Runoff to 1131 (Remains On Site) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 90% Rainfall Rainfall=1.20" Area (sf) CN Description 30,315 30 Woods, Good, HSG A 14,696 39 >75% Grass cover, Good, HSG A 9,829 98 Paved parking & roofs 54,840 45 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 100 0.0270 0.1 Sheet Flow, SFP1 Woods: Light underbrush n= 0.400 P2= 2.75" 3.8 138 0.0150 0.6 Shallow Concentrated Flow, SCFP1 Woodland Kv= 5.0 fps 24.3 238 Total 1140 MIW Drainage Type // 24-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 75 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P2: Post-Development Runoff (Undisturbed Area Discharges Offsite to North) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 90% Rainfall Rainfall=1.20" Area (sf) CN Description 35,553 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.1 50 0.0125 0.1 Sheet Flow, SFP2 Woods: Light underbrush n= 0.400 P2= 2.75" 3.3 110 0.0125 0.6 Shallow Concentrated Flow, SCFP2 Woodland Kv= 5.0 fps 19.4 160 Total 1140 MIW Drainage Type // 24-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 76 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P3: Post Development Runoff (Undisturbed Area Discharges Offsite to South) Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 90% Rainfall Rainfall=1.20" Area (sf) CN Description 79,206 30 Forest Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 35.9 100 0.0067 0.0 Sheet Flow, SFP3 Woods: Light underbrush n= 0.400 P2= 2.75" 7.3 154 0.0050 0.4 Shallow Concentrated Flow, SCFP3 Woodland Kv= 5.0 fps 43.2 254 Total 1140 MIW Drainage Type // 24-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 77 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P4: Post-Development Runoff (Remains On Site) Runoff = 0.00 cfs @ 24.15 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 90% Rainfall Rainfall=1.20" Area (sf) CN Description 33,354 30 Woods, Good, HSG A 48,548 98 Paved parking & roofs 23,432 39 >75% Grass cover, Good, HSG A 105,334 63 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 72 0.0140 0.1 Sheet Flow, SFP4 Woods: Light underbrush n= 0.400 P2= 2.75" 11.0 376 0.0130 0.6 Shallow Concentrated Flow, SCFP4 Woodland Kv= 5.0 fps 31.5 448 Total 1140 MIW Drainage Type // 24-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 78 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond 1P: 1B1 Inflow Area = 1.259 ac, Inflow Depth = 0.00" for 90% Rainfall event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 498.00' @ 0.00 hrs Surf.Area= 0 sf Storage= 0 cf Flood Elev= 500.50' Surf.Area= 2,452 sf Storage= 2,184 cf Plug-Flow detention time= (not calculated: initial storage excedes outflow) Center-of-Mass det. time= (not calculated: no inflow) Volume Invert Avail.Storage Storage Description #1 498.00' 2,184 cf I1131 (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 498.00 0 0 0 499.00 958 479 479 500.00 2,452 1,705 2,184 Device Routing Invert Outlet Devices #1 Discarded 499.55' 0.36 cfs Exfiltration when above invert Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=498.00' (Free Discharge) L1=Exfiltration ( Controls 0.00 cfs) 1140 MIW Drainage Type 1124-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 79 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond 1 P: 1B1 Elevation Discarded Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) (feet) (cfs) 498.00 0.00 499.06 0.00 500.12 0.36 498.02 0.00 499.08 0.00 500.14 0.36 498.04 0.00 499.10 0.00 500.16 0.36 498.06 0.00 499.12 0.00 500.18 0.36 498.08 0.00 499.14 0.00 500.20 0.36 498.10 0.00 499.16 0.00 500.22 0.36 498.12 0.00 499.18 0.00 500.24 0.36 498.14 0.00 499.20 0.00 500.26 0.36 498.16 0.00 499.22 0.00 500.28 0.36 498.18 0.00 499.24 0.00 500.30 0.36 498.20 0.00 499.26 0.00 500.32 0.36 498.22 0.00 499.28 0.00 500.34 0.36 498.24 0.00 499.30 0.00 500.36 0.36 498.26 0.00 499.32 0.00 500.38 0.36 498.28 0.00 499.34 0.00 500.40 0.36 498.30 0.00 499.36 0.00 500.42 0.36 498.32 0.00 499.38 0.00 500.44 0.36 498.34 0.00 499.40 0.00 500.46 0.36 498.36 0.00 499.42 0.00 500.48 0.36 498.38 0.00 499.44 0.00 500.50 0.36 498.40 0.00 499.46 0.00 498.42 0.00 499.48 0.00 498.44 0.00 499.50 0.00 498.46 0.00 499.52 0.00 498.48 0.00 499.54 0.00 498.50 0.00 499.56 0.36 498.52 0.00 499.58 0.36 498.54 0.00 499.60 0.36 498.56 0.00 499.62 0.36 498.58 0.00 499.64 0.36 498.60 0.00 499.66 0.36 498.62 0.00 499.68 0.36 498.64 0.00 499.70 0.36 498.66 0.00 499.72 0.36 498.68 0.00 499.74 0.36 498.70 0.00 499.76 0.36 498.72 0.00 499.78 0.36 498.74 0.00 499.80 0.36 498.76 0.00 499.82 0.36 498.78 0.00 499.84 0.36 498.80 0.00 499.86 0.36 498.82 0.00 499.88 0.36 498.84 0.00 499.90 0.36 498.86 0.00 499.92 0.36 498.88 0.00 499.94 0.36 498.90 0.00 499.96 0.36 498.92 0.00 499.98 0.36 498.94 0.00 500.00 0.36 498.96 0.00 500.02 0.36 498.98 0.00 500.04 0.36 499.00 0.00 500.06 0.36 499.02 0.00 500.08 0.36 499.04 0.00 500.10 0.36 1140 MIW Drainage Type 1124-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 80 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond 1 P: 1B1 Elevation Surface Storage (feet) (sq-ft) (cubic-feet) 498.00 0 0 498.05 48 1 498.10 96 5 498.15 144 11 498.20 192 19 498.25 240 30 498.30 287 43 498.35 335 59 498.40 383 77 498.45 431 97 498.50 479 120 498.55 527 145 498.60 575 172 498.65 623 202 498.70 671 235 498.75 719 269 498.80 766 307 498.85 814 346 498.90 862 388 498.95 910 432 499.00 958 479 499.05 1,033 529 499.10 1,107 582 499.15 1,182 640 499.20 1,257 700 499.25 1,332 765 499.30 1,406 834 499.35 1,481 906 499.40 1,556 982 499.45 1,630 1,061 499.50 1,705 1,145 499.55 1,780 1,232 499.60 1,854 1,323 499.65 1,929 1,417 499.70 2,004 1,516 499.75 2,079 1,618 499.80 2,153 1,723 499.85 2,228 1,833 499.90 2,303 1,946 499.95 2,377 2,063 500.00 2,452 2,184 500.05 2,452 2,184 500.10 2,452 2,184 500.15 2,452 2,184 500.20 2,452 2,184 500.25 2,452 2,184 500.30 2,452 2,184 500.35 2,452 2,184 500.40 2,452 2,184 500.45 2,452 2,184 500.50 2,452 2,184 1140 MIW Drainage Type // 24-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 81 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond 2P: 1B2 Inflow Area = 2.418 ac, Inflow Depth = 0.00" for 90% Rainfall event Inflow = 0.00 cfs @ 24.15 hrs, Volume= 0.000 of Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 100%, Lag= 0.0 min Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 497.02' @ 25.77 hrs Surf.Area= 77 sf Storage= 1 cf Flood Elev= 499.50' Surf.Area= 8,557 sf Storage= 8,375 cf Plug-Flow detention time= (not calculated: initial storage excedes outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 497.00' 8,375 cf I1132 (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 497.00 0 0 0 498.00 4,096 2,048 2,048 499.00 8,557 6,327 8,375 Device Routing Invert Outlet Devices #1 Discarded 498.50' 0.90 cfs Exfiltration when above invert Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=497.00' (Free Discharge) L1=Exfiltration ( Controls 0.00 cfs) 1140 MIW Drainage Type 1124-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 82 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond 2P: 1B2 Elevation Discarded Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) (feet) (cfs) 497.00 0.00 498.06 0.00 499.12 0.90 497.02 0.00 498.08 0.00 499.14 0.90 497.04 0.00 498.10 0.00 499.16 0.90 497.06 0.00 498.12 0.00 499.18 0.90 497.08 0.00 498.14 0.00 499.20 0.90 497.10 0.00 498.16 0.00 499.22 0.90 497.12 0.00 498.18 0.00 499.24 0.90 497.14 0.00 498.20 0.00 499.26 0.90 497.16 0.00 498.22 0.00 499.28 0.90 497.18 0.00 498.24 0.00 499.30 0.90 497.20 0.00 498.26 0.00 499.32 0.90 497.22 0.00 498.28 0.00 499.34 0.90 497.24 0.00 498.30 0.00 499.36 0.90 497.26 0.00 498.32 0.00 499.38 0.90 497.28 0.00 498.34 0.00 499.40 0.90 497.30 0.00 498.36 0.00 499.42 0.90 497.32 0.00 498.38 0.00 499.44 0.90 497.34 0.00 498.40 0.00 499.46 0.90 497.36 0.00 498.42 0.00 499.48 0.90 497.38 0.00 498.44 0.00 499.50 0.90 497.40 0.00 498.46 0.00 497.42 0.00 498.48 0.00 497.44 0.00 498.50 0.00 497.46 0.00 498.52 0.90 497.48 0.00 498.54 0.90 497.50 0.00 498.56 0.90 497.52 0.00 498.58 0.90 497.54 0.00 498.60 0.90 497.56 0.00 498.62 0.90 497.58 0.00 498.64 0.90 497.60 0.00 498.66 0.90 497.62 0.00 498.68 0.90 497.64 0.00 498.70 0.90 497.66 0.00 498.72 0.90 497.68 0.00 498.74 0.90 497.70 0.00 498.76 0.90 497.72 0.00 498.78 0.90 497.74 0.00 498.80 0.90 497.76 0.00 498.82 0.90 497.78 0.00 498.84 0.90 497.80 0.00 498.86 0.90 497.82 0.00 498.88 0.90 497.84 0.00 498.90 0.90 497.86 0.00 498.92 0.90 497.88 0.00 498.94 0.90 497.90 0.00 498.96 0.90 497.92 0.00 498.98 0.90 497.94 0.00 499.00 0.90 497.96 0.00 499.02 0.90 497.98 0.00 499.04 0.90 498.00 0.00 499.06 0.90 498.02 0.00 499.08 0.90 498.04 0.00 499.10 0.90 1140 MIW Drainage Type 1124-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 83 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond 2P: 1B2 Elevation Surface Storage (feet) (sq-ft) (cubic-feet) 497.00 0 0 497.05 205 5 497.10 410 20 497.15 614 46 497.20 819 82 497.25 1,024 128 497.30 1,229 184 497.35 1,434 251 497.40 1,638 328 497.45 1,843 415 497.50 2,048 512 497.55 2,253 620 497.60 2,458 737 497.65 2,662 865 497.70 2,867 1,004 497.75 3,072 1,152 497.80 3,277 1,311 497.85 3,482 1,480 497.90 3,686 1,659 497.95 3,891 1,848 498.00 4,096 2,048 498.05 4,319 2,258 498.10 4,542 2,480 498.15 4,765 2,713 498.20 4,988 2,956 498.25 5,211 3,211 498.30 5,434 3,478 498.35 5,657 3,755 498.40 5,880 4,043 498.45 6,103 4,343 498.50 6,327 4,654 498.55 6,550 4,976 498.60 6,773 5,309 498.65 6,996 5,653 498.70 7,219 6,008 498.75 7,442 6,375 498.80 7,665 6,752 498.85 7,888 7,141 498.90 8,111 7,541 498.95 8,334 7,952 499.00 8,557 8,375 499.05 8,557 8,375 499.10 8,557 8,375 499.15 8,557 8,375 499.20 8,557 8,375 499.25 8,557 8,375 499.30 8,557 8,375 499.35 8,557 8,375 499.40 8,557 8,375 499.45 8,557 8,375 499.50 8,557 8,375 1140 MIW Drainage Type // 24-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 84 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond IT2: Drywell Capacity Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 0.00' @ 0.00 hrs Surf.Area= 0 sf Storage= 0 cf Flood Elev= 497.58' Surf.Area= 95 sf Storage= 294 cf Plug-Flow detention time= (not calculated) Center-of-Mass det. time= (not calculated) Volume Invert Avail.Storage Storage Description #1 492.58' 94 cf Custom Stage Data (Prismatic)Listed below (Recalc) 435 cf Overall - 200 cf Embedded = 235 cf x 40.0% Voids #2 493.58' 200 cf Precast Unit (Prismatic)Listed below (Recalc) Inside #1 294 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 492.58 79 0 0 497.58 95 435 435 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 493.58 50 0 0 497.58 50 200 200 Device Routing Invert Outlet Devices #1 Discarded 0.00' 99.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=0.00' (Free Discharge) L1=Exfiltration ( Controls 0.00 cfs) 1140 MIW Drainage Type 1124-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 85 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond IT2: Drywell Capacity Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) 492.58 0.00 495.23 0.20 492.63 0.18 495.28 0.20 492.68 0.18 495.33 0.20 492.73 0.18 495.38 0.20 492.78 0.18 495.43 0.20 492.83 0.18 495.48 0.20 492.88 0.18 495.53 0.20 492.93 0.18 495.58 0.20 492.98 0.18 495.63 0.20 493.03 0.18 495.68 0.20 493.08 0.18 495.73 0.20 493.13 0.19 495.78 0.20 493.18 0.19 495.83 0.20 493.23 0.19 495.88 0.21 493.28 0.19 495.93 0.21 493.33 0.19 495.98 0.21 493.38 0.19 496.03 0.21 493.43 0.19 496.08 0.21 493.48 0.19 496.13 0.21 493.53 0.19 496.18 0.21 493.58 0.19 496.23 0.21 493.63 0.19 496.28 0.21 493.68 0.19 496.33 0.21 493.73 0.19 496.38 0.21 493.78 0.19 496.43 0.21 493.83 0.19 496.48 0.21 493.88 0.19 496.53 0.21 493.93 0.19 496.58 0.21 493.98 0.19 496.63 0.21 494.03 0.19 496.68 0.21 494.08 0.19 496.73 0.21 494.13 0.19 496.78 0.21 494.18 0.19 496.83 0.21 494.23 0.19 496.88 0.21 494.28 0.19 496.93 0.21 494.33 0.19 496.98 0.21 494.38 0.19 497.03 0.21 494.43 0.19 497.08 0.21 494.48 0.19 497.13 0.21 494.53 0.20 497.18 0.21 494.58 0.20 497.23 0.22 494.63 0.20 497.28 0.22 494.68 0.20 497.33 0.22 494.73 0.20 497.38 0.22 494.78 0.20 497.43 0.22 494.83 0.20 497.48 0.22 494.88 0.20 497.53 0.22 494.93 0.20 497.58 0.22 494.98 0.20 495.03 0.20 495.08 0.20 495.13 0.20 495.18 0.20 1140 MIW Drainage Type 1124-hr 90% Rainfall Rainfall=1.20" Prepared by {enter your company name here} Page 86 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond IT2: Drywell Capacity Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 492.58 79 0 495.23 87 138 492.63 79 2 495.28 88 141 492.68 79 3 495.33 88 144 492.73 79 5 495.38 88 147 492.78 80 6 495.43 88 151 492.83 80 8 495.48 88 154 492.88 80 10 495.53 88 157 492.93 80 11 495.58 89 161 492.98 80 13 495.63 89 164 493.03 80 14 495.68 89 167 493.08 81 16 495.73 89 170 493.13 81 18 495.78 89 174 493.18 81 19 495.83 89 177 493.23 81 21 495.88 90 180 493.28 81 22 495.93 90 184 493.33 81 24 495.98 90 187 493.38 82 26 496.03 90 190 493.43 82 27 496.08 90 193 493.48 82 29 496.13 90 197 493.53 82 31 496.18 91 200 493.58 82 32 496.23 91 203 493.63 82 35 496.28 91 207 493.68 83 39 496.33 91 210 493.73 83 42 496.38 91 213 493.78 83 45 496.43 91 217 493.83 83 48 496.48 91 220 493.88 83 51 496.53 92 223 493.93 83 54 496.58 92 227 493.98 83 57 496.63 92 230 494.03 84 61 496.68 92 233 494.08 84 64 496.73 92 237 494.13 84 67 496.78 92 240 494.18 84 70 496.83 93 243 494.23 84 73 496.88 93 247 494.28 84 77 496.93 93 250 494.33 85 80 496.98 93 253 494.38 85 83 497.03 93 257 494.43 85 86 497.08 93 260 494.48 85 89 497.13 94 264 494.53 85 93 497.18 94 267 494.58 85 96 497.23 94 270 494.63 86 99 497.28 94 274 494.68 86 102 497.33 94 277 494.73 86 105 497.38 94 280 494.78 86 109 497.43 95 284 494.83 86 112 497.48 95 287 494.88 86 115 497.53 95 291 494.93 87 118 497.58 95 294 494.98 87 122 495.03 87 125 495.08 87 128 495.13 87 131 495.18 87 134 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 87 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment E1: Pre-Development Runoff(Remains On SitdRunoff Area=81,116 sf Runoff Depth=0.07" Flow Length=340' Tc=32.8 min CN=30 Runoff=0.01 cfs 0.011 of Subcatchment E2: Pre-Development Runoff(Discharges OffsRunoff Area=69,883 sf Runoff Depth=0.07" Flow Length=365' Tc=39.7 min CN=30 Runoff=0.01 cfs 0.010 of Subcatchment E3: Pre-Development Runoff(Discharges OffRunoff Area=124,045 sf Runoff Depth=0.07" Flow Length=540' Tc=68.0 min CN=30 Runoff=0.02 cfs 0.017 of Subcatchment P1: Post-Development Runoff to I131 (RemainsRunoff Area=54,840 sf Runoff Depth=0.80" Flow Length=238' Tc=24.3 min CN=45 Runoff=0.63 cfs 0.084 of Subcatchment P2: Post-Development Runoff(Undisturbed AiRunoff Area=35,553 sf Runoff Depth=0.07" Flow Length=160' Tc=19.4 min CN=30 Runoff=0.01 cfs 0.005 of Subcatchment P3: Post Development Runoff(Undisturbed AiRunoff Area=79,206 sf Runoff Depth=0.07" Flow Length=254' Tc=43.2 min CN=30 Runoff=0.01 cfs 0.011 of Subcatchment P4: Post-Development Runoff(Remains On SRunoff Area=105,334 sf Runoff Depth=2.18" Flow Length=448' Tc=31.5 min CN=63 Runoff=4.22 cfs 0.439 of Pond 1P: I131 Peak Elev=499.56' Storage=1,253 cf Inflow=0.63 cfs 0.084 of Outflow=0.17 cfs 0.056 of Pond 2P: I132 Peak Elev=498.93' Storage=7,751 cf Inflow=4.22 cfs 0.439 of Outflow=0.90 cfs 0.332 of Pond IT2: Drywell Capacity Peak Elev=0.00' Storage=0 cf Discarded=0.00 cfs 0.000 of Total Runoff Area = 12.626 ac Runoff Volume = 0.576 of Average Runoff Depth = 0.55" 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 88 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E1: Pre-Development Runoff (Remains On Site) Runoff = 0.01 cfs @ 18.11 hrs, Volume= 0.011 af, Depth= 0.07" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 100-Year Rainfall=6.00" Area (sf) CN Description 81,116 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 27.5 144 0.0270 0.1 Sheet Flow, SFE1 Woods: Light underbrush n= 0.400 P2= 2.75" 5.3 196 0.0150 0.6 Shallow Concentrated Flow, SCFE1 Woodland Kv= 5.0 fps 32.8 340 Total 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 89 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E2: Pre-Development Runoff (Discharges Offsite to North) Runoff = 0.01 cfs @ 18.22 hrs, Volume= 0.010 af, Depth= 0.07" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 100-Year Rainfall=6.00" Area (sf) CN Description 69,883 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.3 95 0.0100 0.1 Sheet Flow, SFE2 Woods: Light underbrush n= 0.400 P2= 2.75" 10.4 270 0.0075 0.4 Shallow Concentrated Flow, SCFE2 Woodland Kv= 5.0 fps 39.7 365 Total 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 90 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment E3: Pre-Development Runoff (Discharges Offsite to South) Runoff = 0.02 cfs @ 18.66 hrs, Volume= 0.017 af, Depth= 0.07" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 100-Year Rainfall=6.00" Area (sf) CN Description 124,045 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 49.6 150 0.0067 0.1 Sheet Flow, SFE3 Woods: Light underbrush n= 0.400 P2= 2.75" 18.4 390 0.0050 0.4 Shallow Concentrated Flow, SCFE3 Woodland Kv= 5.0 fps 68.0 540 Total 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 91 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P1: Post-Development Runoff to 1131 (Remains On Site) Runoff = 0.63 cfs @ 12.23 hrs, Volume= 0.084 af, Depth= 0.80" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 100-Year Rainfall=6.00" Area (sf) CN Description 30,315 30 Woods, Good, HSG A 14,696 39 >75% Grass cover, Good, HSG A 9,829 98 Paved parking & roofs 54,840 45 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 100 0.0270 0.1 Sheet Flow, SFP1 Woods: Light underbrush n= 0.400 P2= 2.75" 3.8 138 0.0150 0.6 Shallow Concentrated Flow, SCFP1 Woodland Kv= 5.0 fps 24.3 238 Total 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 92 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P2: Post-Development Runoff (Undisturbed Area Discharges Offsite to North) Runoff = 0.01 cfs @ 17.91 hrs, Volume= 0.005 af, Depth= 0.07" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 100-Year Rainfall=6.00" Area (sf) CN Description 35,553 30 Woods, Good, HSG A Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.1 50 0.0125 0.1 Sheet Flow, SFP2 Woods: Light underbrush n= 0.400 P2= 2.75" 3.3 110 0.0125 0.6 Shallow Concentrated Flow, SCFP2 Woodland Kv= 5.0 fps 19.4 160 Total 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 93 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P3: Post Development Runoff (Undisturbed Area Discharges Offsite to South) Runoff = 0.01 cfs @ 18.29 hrs, Volume= 0.011 af, Depth= 0.07" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 100-Year Rainfall=6.00" Area (sf) CN Description 79,206 30 Forest Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 35.9 100 0.0067 0.0 Sheet Flow, SFP3 Woods: Light underbrush n= 0.400 P2= 2.75" 7.3 154 0.0050 0.4 Shallow Concentrated Flow, SCFP3 Woodland Kv= 5.0 fps 43.2 254 Total 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 94 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Subcatchment P4: Post-Development Runoff (Remains On Site) Runoff = 4.22 cfs @ 12.28 hrs, Volume= 0.439 af, Depth= 2.18" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 100-Year Rainfall=6.00" Area (sf) CN Description 33,354 30 Woods, Good, HSG A 48,548 98 Paved parking & roofs 23,432 39 >75% Grass cover, Good, HSG A 105,334 63 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 72 0.0140 0.1 Sheet Flow, SFP4 Woods: Light underbrush n= 0.400 P2= 2.75" 11.0 376 0.0130 0.6 Shallow Concentrated Flow, SCFP4 Woodland Kv= 5.0 fps 31.5 448 Total 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 95 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond 1P: 1B1 Inflow Area = 1.259 ac, Inflow Depth = 0.80" for 100-Year event Inflow = 0.63 cfs @ 12.23 hrs, Volume= 0.084 of Outflow = 0.17 cfs @ 13.01 hrs, Volume= 0.056 af, Atten= 72%, Lag= 46.5 min Discarded = 0.17 cfs @ 13.01 hrs, Volume= 0.056 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 499.56' @ 13.01 hrs Surf.Area= 1,798 sf Storage= 1,253 cf Flood Elev= 500.50' Surf.Area= 2,452 sf Storage= 2,184 cf Plug-Flow detention time= 231.3 min calculated for 0.056 of(66% of inflow) Center-of-Mass det. time= 98.3 min ( 1,031.3 - 933.0 ) Volume Invert Avail.Storage Storage Description #1 498.00' 2,184 cf I1131 (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 498.00 0 0 0 499.00 958 479 479 500.00 2,452 1,705 2,184 Device Routing Invert Outlet Devices #1 Discarded 499.55' 0.36 cfs Exfiltration when above invert Discarded OutFlow Max=0.36 cfs @ 13.01 hrs HW=499.56' (Free Discharge) L1=Exfiltration (Exfiltration Controls 0.36 cfs) 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 96 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond 1 P: 1B1 Elevation Discarded Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) (feet) (cfs) 498.00 0.00 499.06 0.00 500.12 0.36 498.02 0.00 499.08 0.00 500.14 0.36 498.04 0.00 499.10 0.00 500.16 0.36 498.06 0.00 499.12 0.00 500.18 0.36 498.08 0.00 499.14 0.00 500.20 0.36 498.10 0.00 499.16 0.00 500.22 0.36 498.12 0.00 499.18 0.00 500.24 0.36 498.14 0.00 499.20 0.00 500.26 0.36 498.16 0.00 499.22 0.00 500.28 0.36 498.18 0.00 499.24 0.00 500.30 0.36 498.20 0.00 499.26 0.00 500.32 0.36 498.22 0.00 499.28 0.00 500.34 0.36 498.24 0.00 499.30 0.00 500.36 0.36 498.26 0.00 499.32 0.00 500.38 0.36 498.28 0.00 499.34 0.00 500.40 0.36 498.30 0.00 499.36 0.00 500.42 0.36 498.32 0.00 499.38 0.00 500.44 0.36 498.34 0.00 499.40 0.00 500.46 0.36 498.36 0.00 499.42 0.00 500.48 0.36 498.38 0.00 499.44 0.00 500.50 0.36 498.40 0.00 499.46 0.00 498.42 0.00 499.48 0.00 498.44 0.00 499.50 0.00 498.46 0.00 499.52 0.00 498.48 0.00 499.54 0.00 498.50 0.00 499.56 0.36 498.52 0.00 499.58 0.36 498.54 0.00 499.60 0.36 498.56 0.00 499.62 0.36 498.58 0.00 499.64 0.36 498.60 0.00 499.66 0.36 498.62 0.00 499.68 0.36 498.64 0.00 499.70 0.36 498.66 0.00 499.72 0.36 498.68 0.00 499.74 0.36 498.70 0.00 499.76 0.36 498.72 0.00 499.78 0.36 498.74 0.00 499.80 0.36 498.76 0.00 499.82 0.36 498.78 0.00 499.84 0.36 498.80 0.00 499.86 0.36 498.82 0.00 499.88 0.36 498.84 0.00 499.90 0.36 498.86 0.00 499.92 0.36 498.88 0.00 499.94 0.36 498.90 0.00 499.96 0.36 498.92 0.00 499.98 0.36 498.94 0.00 500.00 0.36 498.96 0.00 500.02 0.36 498.98 0.00 500.04 0.36 499.00 0.00 500.06 0.36 499.02 0.00 500.08 0.36 499.04 0.00 500.10 0.36 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 97 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond 1 P: 1B1 Elevation Surface Storage (feet) (sq-ft) (cubic-feet) 498.00 0 0 498.05 48 1 498.10 96 5 498.15 144 11 498.20 192 19 498.25 240 30 498.30 287 43 498.35 335 59 498.40 383 77 498.45 431 97 498.50 479 120 498.55 527 145 498.60 575 172 498.65 623 202 498.70 671 235 498.75 719 269 498.80 766 307 498.85 814 346 498.90 862 388 498.95 910 432 499.00 958 479 499.05 1,033 529 499.10 1,107 582 499.15 1,182 640 499.20 1,257 700 499.25 1,332 765 499.30 1,406 834 499.35 1,481 906 499.40 1,556 982 499.45 1,630 1,061 499.50 1,705 1,145 499.55 1,780 1,232 499.60 1,854 1,323 499.65 1,929 1,417 499.70 2,004 1,516 499.75 2,079 1,618 499.80 2,153 1,723 499.85 2,228 1,833 499.90 2,303 1,946 499.95 2,377 2,063 500.00 2,452 2,184 500.05 2,452 2,184 500.10 2,452 2,184 500.15 2,452 2,184 500.20 2,452 2,184 500.25 2,452 2,184 500.30 2,452 2,184 500.35 2,452 2,184 500.40 2,452 2,184 500.45 2,452 2,184 500.50 2,452 2,184 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 98 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond 2P: 1B2 Inflow Area = 2.418 ac, Inflow Depth = 2.18" for 100-Year event Inflow = 4.22 cfs @ 12.28 hrs, Volume= 0.439 of Outflow = 0.90 cfs @ 12.34 hrs, Volume= 0.332 af, Atten= 79%, Lag= 3.5 min Discarded = 0.90 cfs @ 12.34 hrs, Volume= 0.332 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 498.93' @ 13.06 hrs Surf.Area= 8,225 sf Storage= 7,751 cf Flood Elev= 499.50' Surf.Area= 8,557 sf Storage= 8,375 cf Plug-Flow detention time= 169.8 min calculated for 0.332 of(76% of inflow) Center-of-Mass det. time= 71.0 min ( 946.4 - 875.4 ) Volume Invert Avail.Storage Storage Description #1 497.00' 8,375 cf I1132 (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 497.00 0 0 0 498.00 4,096 2,048 2,048 499.00 8,557 6,327 8,375 Device Routing Invert Outlet Devices #1 Discarded 498.50' 0.90 cfs Exfiltration when above invert Discarded OutFlow Max=0.90 cfs @ 12.34 hrs HW=498.53' (Free Discharge) L1=Exfiltration (Exfiltration Controls 0.90 cfs) 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 99 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond 2P: 1B2 Elevation Discarded Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) (feet) (cfs) 497.00 0.00 498.06 0.00 499.12 0.90 497.02 0.00 498.08 0.00 499.14 0.90 497.04 0.00 498.10 0.00 499.16 0.90 497.06 0.00 498.12 0.00 499.18 0.90 497.08 0.00 498.14 0.00 499.20 0.90 497.10 0.00 498.16 0.00 499.22 0.90 497.12 0.00 498.18 0.00 499.24 0.90 497.14 0.00 498.20 0.00 499.26 0.90 497.16 0.00 498.22 0.00 499.28 0.90 497.18 0.00 498.24 0.00 499.30 0.90 497.20 0.00 498.26 0.00 499.32 0.90 497.22 0.00 498.28 0.00 499.34 0.90 497.24 0.00 498.30 0.00 499.36 0.90 497.26 0.00 498.32 0.00 499.38 0.90 497.28 0.00 498.34 0.00 499.40 0.90 497.30 0.00 498.36 0.00 499.42 0.90 497.32 0.00 498.38 0.00 499.44 0.90 497.34 0.00 498.40 0.00 499.46 0.90 497.36 0.00 498.42 0.00 499.48 0.90 497.38 0.00 498.44 0.00 499.50 0.90 497.40 0.00 498.46 0.00 497.42 0.00 498.48 0.00 497.44 0.00 498.50 0.00 497.46 0.00 498.52 0.90 497.48 0.00 498.54 0.90 497.50 0.00 498.56 0.90 497.52 0.00 498.58 0.90 497.54 0.00 498.60 0.90 497.56 0.00 498.62 0.90 497.58 0.00 498.64 0.90 497.60 0.00 498.66 0.90 497.62 0.00 498.68 0.90 497.64 0.00 498.70 0.90 497.66 0.00 498.72 0.90 497.68 0.00 498.74 0.90 497.70 0.00 498.76 0.90 497.72 0.00 498.78 0.90 497.74 0.00 498.80 0.90 497.76 0.00 498.82 0.90 497.78 0.00 498.84 0.90 497.80 0.00 498.86 0.90 497.82 0.00 498.88 0.90 497.84 0.00 498.90 0.90 497.86 0.00 498.92 0.90 497.88 0.00 498.94 0.90 497.90 0.00 498.96 0.90 497.92 0.00 498.98 0.90 497.94 0.00 499.00 0.90 497.96 0.00 499.02 0.90 497.98 0.00 499.04 0.90 498.00 0.00 499.06 0.90 498.02 0.00 499.08 0.90 498.04 0.00 499.10 0.90 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 100 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond 2P: 1B2 Elevation Surface Storage (feet) (sq-ft) (cubic-feet) 497.00 0 0 497.05 205 5 497.10 410 20 497.15 614 46 497.20 819 82 497.25 1,024 128 497.30 1,229 184 497.35 1,434 251 497.40 1,638 328 497.45 1,843 415 497.50 2,048 512 497.55 2,253 620 497.60 2,458 737 497.65 2,662 865 497.70 2,867 1,004 497.75 3,072 1,152 497.80 3,277 1,311 497.85 3,482 1,480 497.90 3,686 1,659 497.95 3,891 1,848 498.00 4,096 2,048 498.05 4,319 2,258 498.10 4,542 2,480 498.15 4,765 2,713 498.20 4,988 2,956 498.25 5,211 3,211 498.30 5,434 3,478 498.35 5,657 3,755 498.40 5,880 4,043 498.45 6,103 4,343 498.50 6,327 4,654 498.55 6,550 4,976 498.60 6,773 5,309 498.65 6,996 5,653 498.70 7,219 6,008 498.75 7,442 6,375 498.80 7,665 6,752 498.85 7,888 7,141 498.90 8,111 7,541 498.95 8,334 7,952 499.00 8,557 8,375 499.05 8,557 8,375 499.10 8,557 8,375 499.15 8,557 8,375 499.20 8,557 8,375 499.25 8,557 8,375 499.30 8,557 8,375 499.35 8,557 8,375 499.40 8,557 8,375 499.45 8,557 8,375 499.50 8,557 8,375 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 101 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Pond IT2: Drywell Capacity Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 0.00' @ 0.00 hrs Surf.Area= 0 sf Storage= 0 cf Flood Elev= 497.58' Surf.Area= 95 sf Storage= 294 cf Plug-Flow detention time= (not calculated) Center-of-Mass det. time= (not calculated) Volume Invert Avail.Storage Storage Description #1 492.58' 94 cf Custom Stage Data (Prismatic)Listed below (Recalc) 435 cf Overall - 200 cf Embedded = 235 cf x 40.0% Voids #2 493.58' 200 cf Precast Unit (Prismatic)Listed below (Recalc) Inside #1 294 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 492.58 79 0 0 497.58 95 435 435 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 493.58 50 0 0 497.58 50 200 200 Device Routing Invert Outlet Devices #1 Discarded 0.00' 99.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=0.00' (Free Discharge) L1=Exfiltration ( Controls 0.00 cfs) 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 102 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Discharge for Pond IT2: Drywell Capacity Elevation Discarded Elevation Discarded (feet) (cfs) (feet) (cfs) 492.58 0.00 495.23 0.20 492.63 0.18 495.28 0.20 492.68 0.18 495.33 0.20 492.73 0.18 495.38 0.20 492.78 0.18 495.43 0.20 492.83 0.18 495.48 0.20 492.88 0.18 495.53 0.20 492.93 0.18 495.58 0.20 492.98 0.18 495.63 0.20 493.03 0.18 495.68 0.20 493.08 0.18 495.73 0.20 493.13 0.19 495.78 0.20 493.18 0.19 495.83 0.20 493.23 0.19 495.88 0.21 493.28 0.19 495.93 0.21 493.33 0.19 495.98 0.21 493.38 0.19 496.03 0.21 493.43 0.19 496.08 0.21 493.48 0.19 496.13 0.21 493.53 0.19 496.18 0.21 493.58 0.19 496.23 0.21 493.63 0.19 496.28 0.21 493.68 0.19 496.33 0.21 493.73 0.19 496.38 0.21 493.78 0.19 496.43 0.21 493.83 0.19 496.48 0.21 493.88 0.19 496.53 0.21 493.93 0.19 496.58 0.21 493.98 0.19 496.63 0.21 494.03 0.19 496.68 0.21 494.08 0.19 496.73 0.21 494.13 0.19 496.78 0.21 494.18 0.19 496.83 0.21 494.23 0.19 496.88 0.21 494.28 0.19 496.93 0.21 494.33 0.19 496.98 0.21 494.38 0.19 497.03 0.21 494.43 0.19 497.08 0.21 494.48 0.19 497.13 0.21 494.53 0.20 497.18 0.21 494.58 0.20 497.23 0.22 494.63 0.20 497.28 0.22 494.68 0.20 497.33 0.22 494.73 0.20 497.38 0.22 494.78 0.20 497.43 0.22 494.83 0.20 497.48 0.22 494.88 0.20 497.53 0.22 494.93 0.20 497.58 0.22 494.98 0.20 495.03 0.20 495.08 0.20 495.13 0.20 495.18 0.20 1140 MIW Drainage Type 11 24-hr 100-Year Rainfall=6.00" Prepared by {enter your company name here} Page 103 HydroCADO 7.10 s/n 003578 ©2005 HydroCAD Software Solutions LLC 3/15/2017 Stage-Area-Storage for Pond IT2: Drywell Capacity Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 492.58 79 0 495.23 87 138 492.63 79 2 495.28 88 141 492.68 79 3 495.33 88 144 492.73 79 5 495.38 88 147 492.78 80 6 495.43 88 151 492.83 80 8 495.48 88 154 492.88 80 10 495.53 88 157 492.93 80 11 495.58 89 161 492.98 80 13 495.63 89 164 493.03 80 14 495.68 89 167 493.08 81 16 495.73 89 170 493.13 81 18 495.78 89 174 493.18 81 19 495.83 89 177 493.23 81 21 495.88 90 180 493.28 81 22 495.93 90 184 493.33 81 24 495.98 90 187 493.38 82 26 496.03 90 190 493.43 82 27 496.08 90 193 493.48 82 29 496.13 90 197 493.53 82 31 496.18 91 200 493.58 82 32 496.23 91 203 493.63 82 35 496.28 91 207 493.68 83 39 496.33 91 210 493.73 83 42 496.38 91 213 493.78 83 45 496.43 91 217 493.83 83 48 496.48 91 220 493.88 83 51 496.53 92 223 493.93 83 54 496.58 92 227 493.98 83 57 496.63 92 230 494.03 84 61 496.68 92 233 494.08 84 64 496.73 92 237 494.13 84 67 496.78 92 240 494.18 84 70 496.83 93 243 494.23 84 73 496.88 93 247 494.28 84 77 496.93 93 250 494.33 85 80 496.98 93 253 494.38 85 83 497.03 93 257 494.43 85 86 497.08 93 260 494.48 85 89 497.13 94 264 494.53 85 93 497.18 94 267 494.58 85 96 497.23 94 270 494.63 86 99 497.28 94 274 494.68 86 102 497.33 94 277 494.73 86 105 497.38 94 280 494.78 86 109 497.43 95 284 494.83 86 112 497.48 95 287 494.88 86 115 497.53 95 291 494.93 87 118 497.58 95 294 494.98 87 122 495.03 87 125 495.08 87 128 495.13 87 131 495.18 87 134 NYSDEC Notice of Intent ( NOI) I 0644089821 NOTICE OF INTENT New York State Department of Environmental Conservation Amk Division of Water 625 Broadway, 4th Floor NYREEEEE0 MW Albany, New York 12233-3505 (for DEC use only' Storm—waterStorm—water Discharges Associated. with Cornu .iction Activity 'Under Stat .................................................................................................................................................................................................................. Pollutant Discharge Elimination System (SPDES) General Permit # GP.......0.......15.......00 All sections must be completed unless otherwise noted. Failure to complete all items may result in this form being returned to you, thereby delaying your coverage under this General Permit. Applicants must read and understand the conditions of the permit and prepare a Stormwater Pollution Prevention Plan prior to submitting this NOI. Applicants are responsible for identifying and obtaining other DEC permits that may be required. -IMPORTANT- RETURN THIS FORM TO THE ADDRESS ABOVE OWNERZOTE-RATOR, MUST SIGN FORM Owner/Operator Information (Owner/Operator (Company Name/Private Owner Name/Municipality Name) 1 4 0 C A R E Y R O A D L L C Owner/Operator Contact Person Last Name (NOT CONSULTANT) Owner/Operator Contact Person First Name B I L L B RAN D T Owner/Operator Mailing Address 6 0 R A I L R O A D P L A C E S T E 5 0 2 City S A R A T O G A S P R I N G S State Zip KY 1 2 8 6 6 - Phone (Owner/Operator) Fax (Owner/Operator) Email (Owner/Operator) B I L L B@ M O H A W K I N D U S T R I A L . C O M FED TAX ID E:1 - (not required for individuals) LPage 1 of 14 I 6401089828 Project Site Information Project/Site Name M O H A W K I N D U S T R I A L W E R K S P R O J E C T Street Address (NOT P.O. BOX) 1 4 0 C A R E Y R O A D Side of Street O North O South 0 East O West City/Town/Village (THAT ISSUES BUILDING PERMIT) Q U E E N S B U R Y StateZip County DEC Re ion N Y 1 2 8 0 4 - W A R R E N 5� Name of Nearest Cross Street C O R I N T H R O A D Distance to Nearest Cross Street (Feet) Project In Relation to Cross Street 5 0 0 ®North O South O East O West Tax Map Numbers Tax Map Numbers Section-Block-Parcel 3 0 9 1 3 - 2 - 3 1 1 1 1 1. Provide the Geographic Coordinates for the project site in NYTM Units. To do this you must go to the NYSDEC Stormwater Interactive Map on the DEC website at: www.dec.ny.gov/imsmaps/sto=water/viewer.htm Zoom into your Project Location such that you can accurately click on the centroid of your site. Once you have located your project site, go to the tool boxes on the top and choose "i" (identify) . Then click on the center of your site and a new window containing the X, Y coordinates in UTM will pop up. Transcribe these coordinates into the boxes below. For problems with the interactive map use the help function. X Coordinates (Easting) Y Coordinates (Northing) 7 3 6 8 7 9 4 3 2 9 3 5 2 2. What is the nature of this construction project? 0 New Construction O Redevelopment with increase in impervious area O Redevelopment with no increase in impervious area Page 2 of 14 I 4107089829 3. Select the predominant land use for both pre and post development conditions. SELECT ONLY ONE CHOICE FOR EACH Pre-Development Post-Development Existing Land Use Future Land Use 0 FOREST O SINGLE FAMILY HOME Number of Lots O PASTURE/OPEN LAND O SINGLE FAMILY SUBDIVISION O CULTIVATED LAND O TOWN HOME RESIDENTIAL O SINGLE FAMILY HOME O MULTIFAMILY RESIDENTIAL O SINGLE FAMILY SUBDIVISION O INSTITUTIONAL/SCHOOL O TOWN HOME RESIDENTIAL O INDUSTRIAL O MULTIFAMILY RESIDENTIAL ® COMMERCIAL O INSTITUTIONAL/SCHOOL O MUNICIPAL O INDUSTRIAL O ROAD/HIGHWAY O COMMERCIAL O RECREATIONAL/SPORTS FIELD O ROAD/HIGHWAY O BIKE PATH/TRAIL O RECREATIONAL/SPORTS FIELD O LINEAR UTILITY (water, sewer, gas, etc. ) O BIKE PATH/TRAIL O PARKING LOT O LINEAR UTILITY O CLEARING/GRADING ONLY O PARKING LOT O DEMOLITION, NO REDEVELOPMENT O OTHER O WELL DRILLING ACTIVITY * (Oil, Gas, etc. ) O OTHER *Note: for gas well drilling, non-high volume hydraulic fractured wells only 4. In accordance with the larger common plan of development or sale, enter the total project site area; the total area to be disturbed; existing impervious area to be disturbed (for redevelopment activities) ; and the future impervious area constructed within the disturbed area. (Round to the nearest tenth of an acre.) Future Impervious Total Site Total Area To Existing Impervious Area Within Area Be Disturbed Area To Be Disturbed Disturbed Area 01-F01 1 5. Do you plan to disturb more than 5 acres of soil at any one time? O Yes ® No 6. Indicate the percentage of each Hydrologic Soil Group(HSG) at the site. A B C D 0 7. Is this a phased project? O Yes O No Start Date End Date 8. Enter the planned start and end � / L / _ � / M / dates of the disturbance 0 6 0 1 2 0 1 7 1 0 3 0 2 0 1 7 activities. LPage 3 of 14 I 8600089821 9. Identify the nearest surface waterbody(ies) to which construction site runoff will discharge. Name N O N E 9a. Type of waterbody identified in Question 9? O Wetland / State Jurisdiction On Site (Answer 9b) O Wetland / State Jurisdiction Off Site O Wetland / Federal Jurisdiction On Site (Answer 9b) O Wetland / Federal Jurisdiction Off Site O Stream / Creek On Site O Stream / Creek Off Site O River On Site 9b. How was the wetland identified? O River Off Site O Lake On Site O Regulatory Map O Lake Off Site O Delineated by Consultant O Other Type On Site O Delineated by Army Corps of Engineers O Other Type Off Site Other (identify) 10. Has the surface waterbody(ies) in question 9 been identified as a O Yes 0 No 303 (d) segment in Appendix E of GP-0-15-002? 11. Is this project located in one of the Watersheds identified in Appendix C of GP-0-15-002? O Yes ®No 12. Is the project located in one of the watershed areas associated with AA and AA-S classified O Yes ® No waters? If no, skip question 13. 13. Does this construction activity disturb land with no existing impervious cover and where the Soil Slope Phase is O Yes O No identified as an E or F on the USDA Soil Survey? If Yes, what is the acreage to be disturbed? 14. Will the project disturb soils within a State regulated wetland or the protected 100 foot adjacent O Yes No area? LPage 4 of 14 I 6403039320 15. Does the site runoff enter a separate storm sewer system (including roadside drains, swales, ditches, O Yes ®No O Unknown culverts, etc) ? 16. What is the name of the municipality/entity that owns the separate storm sewer system? 17. Does any runoff from the site enter a sewer classified O Yes ®No O Unknown as a Combined Sewer? 18. Will future use of this site be an agricultural property as defined by the NYS Agriculture and Markets Law? O Yes 0 No 19. Is this property owned by a state authority, state agency, federal government or local government? O Yes No 20. Is this a remediation project being done under a Department approved work plan? (i.e. CERCLA, RCRA, Voluntary Cleanup O Yes 0 No Agreement, etc. ) 21. Has the required Erosion and Sediment Control component of the SWPPP been developed in conformance with the current NYS 0 Yes O No Standards and Specifications for Erosion and Sediment Control (aka Blue Book) ? 22. Does this construction activity require the development of a SWPPP that includes the post-construction stormwater management practice component (i.e. Runoff Reduction, Water Quality and 0 Yes O No Quantity Control practices/techniques) ? If No, skip questions 23 and 27-39. 23. Has the post-construction stormwater management practice component of the SWPPP been developed in conformance with the current NYS 0 Yes O No Stormwater Management Design Manual? Page 5 of 14 I 0251089825 24. The Stormwater Pollution Prevention Plan (SWPPP) was prepared by: ® Professional Engineer (P.E.) O Soil and Water Conservation District (SWCD) O Registered Landscape Architect (R.L.A) O Certified Professional in Erosion and Sediment Control (CPESC) O Owner/Operator O Other SWPPP Preparer V I S I O N E N G W E E R I N G L L C Contact Name (Last, Space, First) R Y A N D A N I E L Mailing Address 2 0 6 G L E N S T R E E T S U I T E 5 6 City G L E N S F A L L S State Zip N Y 1 2 8 0 1 - � Phone Fax Email D R Y A N@ V I S I O N E N G . E M A I L SWPPP Preparer Certification I hereby certify that the Stormwater Pollution Prevention Plan (SWPPP) for this project has been prepared in accordance with the terms and conditions of the GP-0-15-002. Furthermore, I understand that certifying false, incorrect or inaccurate information is a violation of this permit and the laws of the State of New York and could subject me to criminal, civil and/or administrative proceedings. First Name MI D A N I E L Last Name R Y A N P E Signature Date 0 3 1 5 2 0 1 7 LPage 6 of 14 I 0005089822 25. Has a construction sequence schedule for the planned management practices been prepared? ® Yes O No 26. Select all of the erosion and sediment control practices that will be employed on the project site: Temporary Structural Vegetative Measures a Check Dams O Brush Matting O Construction Road Stabilization O Dune Stabilization a Dust Control O Grassed Waterway O Earth Dike 0 Mulching O Level Spreader O Protecting Vegetation O Perimeter Dike/Swale O Recreation Area Improvement O Pipe Slope Drain 0 Seeding O Portable Sediment Tank O Sodding O Rock Dam O Straw/Hay Bale Dike Sediment Basin O Streambank Protection Sediment Traps Temporary Swale Silt Fence Topsoiling Stabilized Construction Entrance O Vegetating Waterways Storm Drain Inlet Protection Permanent Structural O Straw/Hay Bale Dike O Temporary Access Waterway Crossing O Debris Basin O Temporary Stormdrain Diversion O Diversion • Temporary Swale O Grade Stabilization Structure O Turbidity Curtain 0 Land Grading O Water bars O Lined Waterway (Rock) O Paved Channel (Concrete) Biotechnical O Paved Flume O Brush Matting O Retaining Wall O Wattling O Riprap Slope Protection O Rock Outlet Protection Other O Streambank Protection Page 7 of 14 I 0182089828 Post-construction Stormwater Management Practice (SMP) Requirements Important: Completion of Questions 27-39 is not required if response to Question 22 is No. 27. Identify all site planning practices that were used to prepare the final site plan/layout for the project. Preservation of Undisturbed Areas Preservation of Buffers Reduction of Clearing and Grading Locating Development in Less Sensitive Areas O Roadway Reduction O Sidewalk Reduction O Driveway Reduction O Cul-de-sac Reduction O Building Footprint Reduction O Parking Reduction 27a. Indicate which of the following soil restoration criteria was used to address the requirements in Section 5.1.6 ("Soil Restoration") of the Design Manual (2010 version) . All disturbed areas will be restored in accordance with the Soil Restoration requirements in Table 5.3 of the Design Manual (see page 5-22) . O Compacted areas were considered as impervious cover when calculating the WQv Required, and the compacted areas were assigned a post-construction Hydrologic Soil Group (HSG) designation that is one level less permeable than existing conditions for the hydrology analysis. 28. Provide the total Water Quality Volume (WQv) required for this project (based on final site plan/layout) . Total WQv Required �- 1 4 acre-feet 29. Identify the RR techniques (Area Reduction) , RR techniques (Volume Reduction) and Standard SMPs with RRv Capacity in Table 1 (See Page 9) that were used to reduce the Total WQv Required(#28) . Also, provide in Table 1 the total impervious area that contributes runoff to each technique/practice selected. For the Area Reduction Techniques, provide the total contributing area (includes pervious area) and, if applicable, the total impervious area that contributes runoff to the technique/practice. Note: Redevelopment projects shall use Tables 1 and 2 to identify the SMPs used to treat and/or reduce the WQv required. If runoff reduction techniques will not be used to reduce the required WQv, skip to question 33a after identifying the SMPs. Page 8 of 14 I 7738089822 Table 1 - Runoff Reduction (RR) Techniques and Standard Stormwater Management Practices (SMPs) Total Contributing Total Contributing RR Techniques (Area Reduction) Area (acres) Impervious Area(acres) O Conservation of Natural Areas (RR-1) . . . �•� and/or �•� O Sw to Riparian �•� �•� Buffers/Filters Strips (RR-2) , , , , , , , , , , and/or O Tree Planting/Tree Pit (RR-3) • • • • • • • • • • �'� and/or O Disconnection of Rooftop Runoff (RR-4) • • �'� and/or RR Techniques (Volume Reduction) O Vegetated Swale (RR-5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O Rain Garden (RR-6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O Stormwater Planter (RR-7) • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • O Rain Barrel/Cistern (RR-8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O Porous Pavement (RR-9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O Green Roof (RR-10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . �•� Standard SMPs with RRv Capacity O Infiltration Trench (I-1) • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1 3 0 Infiltration Basin (I-2) • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • ODry Well (I-3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O Underground Infiltration System (I-4) • • • • • • • • • • • • • • • • • • • • • • • • O Bioretention (F-5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O Dry Swale (0-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standard SMPs O Micropool Extended Detention (P-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . O Wet Pond (P-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O Wet Extended Detention (P-3) • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • O Multiple Pond System (P-4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O Pocket Pond (P-5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O Surface Sand Filter (F-1) • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • O Underground Sand Filter (F-2) • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • O Perimeter Sand Filter (F-3) • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • �•� O Organic Filter (F-4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O Shallow Wetland (W-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O Extended Detention Wetland (W-2) • • • • • • • • • • • • • • • • • • • • • • • • • • • • • O Pond/Wetland System (W-3) • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • O Pocket Wetland (W-4) • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • O Wet Swale (0-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LPage 9 of 14 I 0762089822 Table 2 - Alternative SMPs (DO NOT INCLUDE PRACTICES BEING USED FOR PRETREATMENT ONLY) Total Contributing Alternative SMP Impervious Area(acres) O Hydrodynamic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . �•� OWet Vault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O Media Filter O Other . Provide the name and manufacturer of the Alternative SMPs (i.e. proprietary practice (s) ) being used for WQv treatment. Name Manufacturer Note: Redevelopment projects which do not use RR techniques, shall use questions 28, 29, 33 and 33a to provide SMPs used, total WQv required and total WQv provided for the project. 30. Indicate the Total RRv provided by the RR techniques (Area/Volume Reduction) and Standard SMPs with RRv capacity identified in question 29. Total RRv provided �• 1 4 acre-feet 31. Is the Total RRv provided (#30) greater than or equal to the total WQv required (#28) . ® Yes O No If Yes, go to question 36. If No, go to question 32. 32. Provide the Minimum RRv required based on HSG. [Minimum RRv Required = (P) (0. 95) (Ai) /12, Ai=(S) (Aic) ] Minimum RRv Required acre-feet 32a. Is the Total RRv provided (#30) greater than or equal to the Minimum RRv Required (#32) ? 0 Yes O No If Yes, go to question 33. Note: Use the space provided in question #39 to summarize the specific site limitations and justification for not reducing 1000 of WQv required (#28) . A detailed evaluation of the specific site limitations and justification for not reducing 1000 of the WQv required (#28) must also be included in the SWPPP. If No, sizing criteria has not been met, so NOI can not be processed. SWPPP preparer must modify design to meet sizing criteria. Page 10 of 14 I 1766089827 33. Identify the Standard SMPs in Table 1 and, if applicable, the Alternative SMPs in Table 2 that were used to treat the remaining total WQv(=Total WQv Required in 28 - Total RRv Provided in 30) . Also, provide in Table 1 and 2 the total impervious area that contributes runoff to each practice selected. Note: Use Tables 1 and 2 to identify the SMPs used on Redevelopment projects. 33a. Indicate the Total WQv provided (i.e. WQv treated) by the SMPs identified in question #33 and Standard SMPs with RRv Capacity identified in question 29. WQv Provided acre-feet Note: For the standard SMPs with RRv capacity, the WQv provided by each practice the WQv calculated using the contributing drainage area to the practice RRv provided by the practice. (See Table 3.5 in Design Manual) 34. Provide the sum of the Total RRv provided (#30) and the WQv provided (#33a) . 35. Is the sum of the RRv provided (#30) and the WQv provided (#33a) greater than or equal to the total WQv required (#28) ? ® Yes O No If Yes, go to question 36. If No, sizing criteria has not been met, so NOI can not be processed. SWPPP preparer must modify design to meet sizing criteria. 36. Provide the total Channel Protection Storage Volume (CPv) required and provided or select waiver (36a) , if applicable. CPv Required CPv Provided acre-feet �'�acre-feet 36a. The need to provide channel protection has been waived because: O Site discharges directly to tidal waters or a fifth order or larger stream. Reduction of the total CPv is achieved on site through runoff reduction techniques or infiltration systems. 37. Provide the Overbank Flood (Qp) and Extreme Flood (Qf) control criteria or select waiver (37a) , if applicable. Total Overbank Flood Control Criteria (Qp) Pre-Development Post-development 01' CFS �' CFS Total Extreme Flood Control Criteria (Qf) Pre-Development Post-development 0 . 0 3 CFS �0 0 1 5 CFS Page 11 of 14 I 1310089822 37a. The need to meet the Qp and Qf criteria has been waived because: O Site discharges directly to tidal waters or a fifth order or larger stream. O Downstream analysis reveals that the Qp and Qf controls are not required 38. Has a long term Operation and Maintenance Plan for the post-construction stormwater management practice (s) been ® Yes O No developed? If Yes, Identify the entity responsible for the long term Operation and Maintenance O W N E R 39. Use this space to summarize the specific site limitations and justification for not reducing 1000 of WQv required(#28) . (See question 32a) This space can also be used for other pertinent project information. Page 12 of 14 I 4285089826 40. Identify other DEC permits, existing and new, that are required for this project/facility. O Air Pollution Control O Coastal Erosion O Hazardous Waste O Long Island Wells O Mined Land Reclamation O Solid Waste O Navigable Waters Protection / Article 15 O Water Quality Certificate O Dam Safety O Water Supply O Freshwater Wetlands/Article 24 O Tidal Wetlands O Wild, Scenic and Recreational Rivers O Stream Bed or Bank Protection / Article 15 O Endangered or Threatened Species (Incidental Take Permit) O Individual SPDES O SPDES Multi-Sector GP N Y R O Other O None 41. Does this project require a US Army Corps of Engineers Wetland Permit? .❑ O Yes No If Yes, Indicate Size of Impact. 42. Is this project subject to the requirements of a regulated, traditional land use control MS4? O Yes 0 No (If No, skip question 43) 43. Has the "MS4 SWPPP Acceptance" form been signed by the principal executive officer or ranking elected official and submitted along ® Yes O No with this NOI? 44. If this NOI is being submitted for the purpose of continuing or transferring coverage under a general permit for stormwater runoff from construction activities, please indicate the former SPDES number assigned. N Y R LPage 13 of 14 I 3547039326 Owner/Operator Certification I have read or been advised of the permit conditions and believe that I understand them. I also understand that, under the terms of the permit, there may be reporting requirements. I hereby certify that this document and the corresponding documents were prepared under my direction or supervision. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. I further understand that coverage under the general permit will be identified in the acknowledgment that I will receive as a result of submitting this NOI and can be as long as sixty (60) business days as provided for in the general permit. I also understand that, by submitting this NOI, I am acknowledging that the SWPPP has been developed and will be implemented as the first element of construction, and agreeing to comply with all the terms and conditions of the general permit for which this NOI is being submitted. Print First Name MI D A N I E L WI Print Last Name R Y A N Owner/Operator Signature Date 0 3 1 5 2 0 1 7 Page 14 of 14 Sample Stormwater Control Facility Maintenance Agreement SAMPLE STORMWATER CONTROL FACILITY MAINTENANCE AGREEMENT Whereas, the Municipality of the ("Municipality") and ("facility owner") want to enter into an agreement to provide for the long term maintenance and continuation of stormwater control measures approved by the Municipality for the below named project, and Whereas, the Municipality and the facility owner desire that the stormwater control measures be built in accordance with the approved project plans and thereafter be maintained, cleaned, repaired, replaced and continued in perpetuity in order to ensure optimum performance of the components. Therefore, the Municipality and the facility owner agree as follows: Project: 1. This agreement binds the Municipality and the facility owner, its successors and assigns, to the maintenance provisions depicted in the approved project plans and SWPPP. 2. The facility owner shall maintain, clean, repair, replace and continue the stormwater control measures depicted in approved construction documents as necessary to ensure optimum performance of the measures to design specifications. The stormwater control measures shall include, but shall not be limited to, the following: drainage ditches, swales, infiltration trenches, infiltration beds, drop inlets, control structures, pipes, culverts, soil absorption devices, sedimentation forebays, pavements, ground cover and/or vegetation, and infiltration basins. 3. The facility owner shall be responsible for all expenses related to the maintenance of the stormwater control measures and shall establish a means for the collection and distribution of expenses among parties for any commonly owned facilities, where necessary. 4. The facility owner shall provide for the periodic inspection of the stormwater control measures, not less than once every year, to determine the condition and integrity of the measures. Such inspection shall be performed by a qualified professional according to NYS standards. The inspecting person or agency shall prepare and submit to the Municipality within 30 days of the inspection, a written report of the findings including recommendations for those actions necessary for the continuation of the stormwater control measures. 5. The facility owner shall not authorize, undertake or permit alteration, abandonment, modification or discontinuation of the stormwater control measures except in accordance with written approval of the Municipality. 6. The facility owner shall undertake necessary repairs and replacement of the stormwater control measures at the direction of the Municipality or in accordance with the recommendations of the inspecting person or agency. 7.The facility owner shall provide to the Municipality in accordance with local requirements or ordinances any surety or security for the maintenance and continuation of the stormwater control measures in a form acceptable to the Municipality(a Bond, letter of credit or escrow account). 8. This agreement shall be recorded in the Office of the Town and/or County Clerk in the county where the project resides, together with the deed for the common property, as required by the Municipality. 9. If ever the Municipality determines that the facility owner has failed to construct or maintain the stormwater control measures in accordance with the project plan or has failed to undertake corrective action specified by the Municipality or by the inspecting person or agency, the Municipality is authorized to undertake such steps as reasonably necessary for the preservation, continuation or maintenance of the stormwater control measures and to affix the expenses thereof as a lien against the property. Right-of-Entry for Inspection When any new stormwater management facility is installed on private property or when any new connection is made between private property and the public storm water system, the landowner shall grant to the Town of Moreau the right to enter the property or premises at reasonable times and in a reasonable manner for the purpose of periodic inspection of the onsite stormwater facilities. The Town of Moreau shall provide reasonable notice to the Owner of such site visits prior to entering the premises. Signatures Owner: Name &Title Signature Date Municipality: Name &Title Signature Date NYSDEC SPDES General Permit for Stormwater Discharges from Construction IPNEWYORK epart entOf E OF ORMNITY Environmental Conservation NEW YORK STATE DEPARTMENT OF ENVIRONMENTAL CONSERVATION SPDES GENERAL PERMIT FOR STORMWATER DISCHARGES From CONSTRUCTION ACTIVITY Permit No. GP-0-15-002 Issued Pursuant to Article 17, Titles 7, 8 and Article 70 of the Environmental Conservation Law Effective Date: January 29, 2015 Expiration Date: January 28, 2020 Modification Date: July 14, 2015 — Correction of typographical error in definition of "New Development", Appendix A John J. Ferguson Chief Permit Administrator AuthorizeV SignaturO Date Address: NYS DEC Division of Environmental Permits 625 Broadway, 4th Floor Albany, N.Y. 12233-1750 PREFACE Pursuant to Section 402 of the Clean Water Act ("CWA"), stormwater discharges from certain construction activities are unlawful unless they are authorized by a National Pollutant Discharge Elimination System ("NPDES') permit or by a state permit program. New York's State Pollutant Discharge Elimination System ("SPDES') is a NPDES- approved program with permits issued in accordance with the Environmental Conservation Law ("ECL'). This general permit ("permit") is issued pursuant to Article 17, Titles 7, 8 and Article 70 of the ECL. An owner or operator may obtain coverage under this permit by submitting a Notice of Intent ("NOI") to the Department. Copies of this permit and the NOI for New York are available by calling (518) 402-8109 or at any New York State Department of Environmental Conservation ("the Department") regional office (see Appendix G).They are also available on the Department's website at- http://www.dec.ny.gov/ An owner or operator of a construction activity that is eligible for coverage under this permit must obtain coverage prior to the commencement of construction activity. Activities that fit the definition of"construction activity', as defined under 40 CFR 122.26(b)(14)(x), (15)(i), and (15)(ii), constitute construction of a point source and therefore, pursuant to Article 17-0505 of the ECL, the owner or operator must have coverage under a SPDES permit prior to commencing construction activity. They cannot wait until there is an actual discharge from the construction site to obtain permit coverage. *Note: The italicized words/phrases within this permit are defined in Appendix A. I NEW YORK STATE DEPARTMENT OF ENVIRONMENTAL CONSERVATION SPDES GENERAL PERMIT FOR STORMWATER DISCHARGES FROM CONSTRUCTION ACTIVITIES Part I. PERMIT COVERAGE AND LIMITATIONS..............................................................1 A. Permit Application .................................................................................................1 B. Effluent Limitations Applicable to Discharges from Construction Activities ...........1 C. Post-construction Stormwater Management Practice Requirements ....................4 D. Maintaining Water Quality.....................................................................................8 ED Eligibility Under This General Iferimiteeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee9 F. Activities Which Are Ineligible for Coverage Under This General Permit ..............9 Part 11. OBTAINING PERMIT COVERAGE .....................................................................12 A. Notice of Intent (NOI) Submittal ..........................................................................12 B. Permit Authorization............................................................................................13 C. General Requirements For Owners or Operators With Permit Coverage ...........15 D. Permit Coverage for Discharges Authorized Under GP-0-10-001 .......................17 E. Change of Owner or Operator.............................................................................17 Part III. STORMWATER POLLUTION PREVENTION PLAN (SWPPP)...........................18 A. General SWPPP Requirements ..........................................................................18 B. Required SWPPP Contents ................................................................................20 C. Required SWPPP Components by Project Type.................................................23 Part IV. INSPECTION AND MAINTENANCE REQUIREMENTS .....................................24 A. General Construction Site Inspection and Maintenance Requirements ..............24 B. Contractor Maintenance Inspection Requirements .............................................24 C. Qualified Inspector Inspection Requirements......................................................24 Part V. TERMINATION OF PERMIT COVERAGE...........................................................28 A. Termination of Permit Coverage .........................................................................28 Part VI. REPORTING AND RETENTION OF RECORDS ................................................30 A. Record Retention ................................................................................................30 B. Addresses...........................................................................................................30 Part VII. STANDARD PERMIT CONDITIONS.................................................................31 A. Duty to Comply....................................................................................................31 B. Continuation of the Expired General Permit........................................................31 C. Enforcement........................................................................................................31 D. Need to Halt or Reduce Activity Not a Defense...................................................31 E. Duty to Mitigate ...................................................................................................32 F. Duty to Provide Information.................................................................................32 G. Other Information ................................................................................................32 H. Signatory Requirements......................................................................................32 I. Property Rights.......................................................................................................34 J. Severability.............................................................................................................34 K. Requirement to Obtain Coverage Under an Alternative Permit...........................34 L. Proper Operation and Maintenance ....................................................................35 M. Inspection and Entry ...........................................................................................35 N. Permit Actions.....................................................................................................36 O. Definitions ...........................................................................................................36 P. Re-Opener Clause ..............................................................................................36 11 Q. Penalties for Falsification of Forms and Reports.................................................36 R. Other Permits......................................................................................................36 APPENDIXA....................................................................................................................37 APPENDIXB....................................................................................................................44 APPENDIXC ...................................................................................................................46 APPENDIXD ...................................................................................................................52 APPENDIXE....................................................................................................................53 APPENDIXF....................................................................................................................55 III (Part 1) Part I. PERMIT COVERAGE AND LIMITATIONS A. Permit Application This permit authorizes stormwater discharges to surface waters of the State from the following construction activities identified within 40 CFR Parts 122.26(b)(14)(x), 122.26(b)(15)(i) and 122.26(b)(15)(ii), provided all of the eligibility provisions of this permit are met: 1., Construction activities involving soil disturbances of one (1) or more acres; including disturbances of less than one acre that are part of a larger common plan of development or sale that will ultimately disturb one or more acres of land; excluding routine maintenance activity that is performed to maintain the original line and grade, hydraulic capacity or original purpose of a facility; 2. Construction activities involving soil disturbances of less than one (1) acre where the Department has determined that a SPDES permit is required for stormwater discharges based on the potential for contribution to a violation of a water quality standard or for significant contribution of pollutants to surface waters of the State. . Construction activities located in the watershed(s) identified in Appendix D that involve soil disturbances between five thousand (5,000) square feet and one (1) acre of land. B. Effluent Limitations Applicable to Discharges from Construction Activities Discharges authorized by this permit must achieve, at a minimum, the effluent limitations in Part I.B.1. (a)— (f)of this permit. These limitations represent the degree of effluent reduction attainable by the application of best practicable technology currently available._ 1, Erosion and Sediment Control Requirements - The owner or operator must select, design, install, implement and maintain control measures to minimize the discharge of pollutants and prevent a violation of the water quality standards. The selection, design, installation, implementation, and maintenance of these control measures must meet the non-numeric effluent limitations in Part I.B.1.(a) — (f) of this permit and be in accordance with the New York State Standards and Specifications for Erosion and Sediment Control, dated August 2005, using sound engineering judgment. Where control measures are not designed in conformance with the design criteria included in the technical standard, the owner or operator must include in the Stormwater Pollution Prevention Plan ("SWPPP") the reason(s) for the deviation or alternative design and provide information 1 (Part I.B.1) which demonstrates that the deviation or alternative design is equivalent to the technical standard. a. Erosion and Sediment Controls. Design, install and maintain effective erosion and sediment controls to minimize the discharge of pollutants and prevent a violation of the water quality standards. At a minimum, such controls must be designed, installed and maintained to: (i) Minimize soil erosion through application of runoff control and soil stabilization control measure to minimize pollutant discharges; (ii) Control stormwater discharges to minimize channel and streambank erosion and scour in the immediate vicinity of the discharge points; (iii) Minimize the amount of soil exposed during construction activity; (iv) Minimize the disturbance of steep slopes; (v) Minimize sediment discharges from the site; (vi) Provide and maintain natural buffers around surface waters, direct stormwater to vegetated areas and maximize stormwater infiltration to reduce pollutant discharges, unless infeasible; (vii) Minimize soil compaction. Minimizing soil compaction is not required where the intended function of a specific area of the site dictates that it be compacted; and (viii) Unless infeasible, preserve a sufficient amount of topsoil to complete soil restoration and establish a uniform, dense vegetative cover. b. Soil Stabilization. In areas where soil disturbance activity has temporarily or permanently ceased, the application of soil stabilization measures must be initiated by the end of the next business day and completed within fourteen (14) days from the date the current soil disturbance activity ceased. For construction sites that directly discharge to one of the 303(d) segments listed in Appendix E or is located in one of the watersheds listed in Appendix C, the application of soil stabilization measures must be initiated by the end of the next business day and completed within seven (7) days from the date the current soil disturbance activity ceased. See Appendix A for definition of Temporarily Ceased. c. Dewatering. Discharges from dewatering activities, including discharges 2 (Part I.B.1.c) from dewatering of trenches and excavations, must be managed by appropriate control measures. d. Pollution Prevention Measures. Design, install, implement, and maintain effective pollution prevention measures to minimize the discharge of pollutants and prevent a violation of the water quality standards. At a minimum, such measures must be designed, installed, implemented and maintained to: (i) Minimize the discharge of pollutants from equipment and vehicle washing, wheel wash water, and other wash waters. This applies to washing operations that use clean water only. Soaps, detergents and solvents cannot be used; (ii) Minimize the exposure of building materials, building products, construction wastes, trash, landscape materials, fertilizers, pesticides, herbicides, detergents, sanitary waste and other materials present on the site to precipitation and to stormwater. Minimization of exposure is not required in cases where the exposure to precipitation and to stormwater will not result in a discharge of pollutants, or where exposure of a specific material or product poses little risk of stormwater contamination (such as final products and materials intended for outdoor use) ; and (iii) Prevent the discharge of pollutants from spills and leaks and implement chemical spill and leak prevention and response procedures. e. Prohibited Discharges. The following discharges are prohibited: (i) Wastewater from washout of concrete; (ii) Wastewater from washout and cleanout of stucco, paint, form release oils, curing compounds and other construction materials; (iii) Fuels, oils, or other pollutants used in vehicle and equipment operation and maintenance; (iv) Soaps or solvents used in vehicle and equipment washing; and (v) Toxic or hazardous substances from a spill or other release. f. Surface Outlets. When discharging from basins and impoundments, the outlets shall be designed, constructed and maintained in such a manner that sediment does not leave the basin or impoundment and that erosion 3 (Part I.B.1.f) at or below the outlet does not occur. C. Post-construction Stormwater Management Practice Requirements 1. The owner or operator of a construction activity that requires post- construction stormwater management practices pursuant to Part III.C. of this permit must select, design, install, and maintain the practices to meet the performance criteria in the New York State Stormwater Management Design Manual ("Design Manual"), dated January 2015, using sound engineering judgment. Where post-construction stormwater management practices ("SMPs") are not designed in conformance with the performance criteria in the Design Manual, the owner or operator must include in the SWPPP the reason(s) for the deviation or alternative design and provide information which demonstrates that the deviation or alternative design is equivalent to the technical standard. 2. The owner or operator of a construction activity that requires post- construction stormwater management practices pursuant to Part III.C. of this permit must design the practices to meet the applicable sizing criteria in Part I.C.2.a., b., c. or d. of this permit. a. Sizing Criteria for New Development (i) Runoff Reduction Volume ("RRv"): Reduce the total Water Quality Volume ("WQv") by application of RR techniques and standard SMPs with RRv capacity. The total WQv shall be calculated in accordance with the criteria in Section 4.2 of the Design Manual. (ii) Minimum RRv and Treatment of Remaining Total WQv: Construction activities that cannot meet the criteria in Part I.C.2.a.(i) of this permit due to site limitations shall direct runoff from all newly constructed impervious areas to a RR technique or standard SMP with RRv capacity unless infeasible. The specific site limitations that prevent the reduction of 100% of the WQv shall be documented in the SWPPP. For each impervious area that is not directed to a RR technique or standard SMP with RRv capacity, the SWPPP must include documentation which demonstrates that all options were considered and for each option explains why it is considered infeasible. In no case shall the runoff reduction achieved from the newly constructed impervious areas be less than the Minimum RRv as calculated using the criteria in Section 4.3 of the Design Manual. The remaining portion of the total WQv 4 (Part I.C.2.a.ii) that cannot be reduced shall be treated by application of standard SMPs. (iii) Channel Protection Volume ("Cpv"): Provide 24 hour extended detention of the post-developed 1-year, 24-hour storm event; remaining after runoff reduction. The Cpv requirement does not apply when: (1) Reduction of the entire Cpv is achieved by application of runoff reduction techniques or infiltration systems, or (2) The site discharges directly to tidal waters, or fifth order or larger streams. (iv) Overbank Flood Control Criteria ("Qp"): Requires storage to attenuate the post-development 10-year, 24-hour peak discharge rate (Qp) to predevelopment rates. The Qp requirement does not apply when: (1) the site discharges directly to tidal waters or fifth order or larger streams, or (2) A downstream analysis reveals that overbank control is not required. (v) Extreme Flood Control Criteria ("Qf'): Requires storage to attenuate the post-development 100-year, 24-hour peak discharge rate (Qf) to predevelopment rates. The Qf requirement does not apply when: (1) the site discharges directly to tidal waters or fifth order or larger streams, or (2) A downstream analysis reveals that overbank control is not required. b. Sizing Criteria for New Development in Enhanced Phosphorus Removal Watershed (i) Runoff Reduction Volume (RRv): Reduce the total Water Quality Volume (WQv) by application of RR techniques and standard SMPs with RRv capacity. The total WQv is the runoff volume from the 1-year, 24 hour design storm over the post-developed watershed and shall be calculated in accordance with the criteria in Section 10.3 of the Design Manual. (ii) Minimum RRv and Treatment of Remaining Total WQv: Construction activities that cannot meet the criteria in Part I.C.2.b.(i) of this permit due to site limitations shall direct runoff from all newly constructed impervious areas to a RR technique or 5 (Part I.C.2.b.ii) standard SMP with RRv capacity unless infeasible. The specific site limitations that prevent the reduction of 100% of the WQv shall be documented in the SWPPP. For each impervious area that is not directed to a RR technique or standard SMP with RRv capacity, the SWPPP must include documentation which demonstrates that all options were considered and for each option explains why it is considered infeasible. In no case shall the runoff reduction achieved from the newly constructed impervious areas be less than the Minimum RRv as calculated using the criteria in Section 10.3 of the Design Manual. The remaining portion of the total WQv that cannot be reduced shall be treated by application of standard SMPs. (iii) Channel Protection Volume (Cpv): Provide 24 hour extended detention of the post-developed 1-year, 24-hour storm event; remaining after runoff reduction. The Cpv requirement does not apply when: (1) Reduction of the entire Cpv is achieved by application of runoff reduction techniques or infiltration systems, or (2) The site discharges directly to tidal waters, or fifth order or larger streams. (iv) Overbank Flood Control Criteria (Qp): Requires storage to attenuate the post-development 10-year, 24-hour peak discharge rate (Qp) to predevelopment rates. The Qp requirement does not apply when: (1) the site discharges directly to tidal waters or fifth order or larger streams, or (2) A downstream analysis reveals that overbank control is not required. (v) Extreme Flood Control Criteria (Qf): Requires storage to attenuate the post-development 100-year, 24-hour peak discharge rate (Qf) to predevelopment rates. The Qf requirement does not apply when: (1) the site discharges directly to tidal waters or fifth order or larger streams, or (2) A downstream analysis reveals that overbank control is not required. c. Sizing Criteria for Redevelopment Activity 6 (Part I.C.2.c.i) (i) Water Quality Volume (WQv): The WQv treatment objective for redevelopment activity shall be addressed by one of the following options. Redevelopment activities located in an Enhanced Phosphorus Removal Watershed (see Part III.B.3. and Appendix C of this permit) shall calculate the WQv in accordance with Section 10.3 of the Design Manual. All other redevelopment activities shall calculate the WQv in accordance with Section 4.2 of the Design Manual. (1) Reduce the existing impervious cover by a minimum of 25% of the total disturbed, impervious area. The Soil Restoration criteria in Section 5.1.6 of the Design Manual must be applied to all newly created pervious areas, or (2) Capture and treat a minimum of 25% of the WQv from the disturbed, impervious area by the application of standard SMPs; or reduce 25% of the WQv from the disturbed, impervious area by the application of RR techniques or standard SMPs with RRv capacity., or (3) Capture and treat a minimum of 75% of the WQv from the disturbed, impervious area as well as any additional runoff from tributary areas by application of the alternative practices discussed in Sections 9.3 and 9.4 of the Design Manual., or (4) Application of a combination of 1, 2 and 3 above that provide a weighted average of at least two of the above methods. Application of this method shall be in accordance with the criteria in Section 9.2.1(B) (IV) of the Design Manual. If there is an existing post-construction stormwater management practice located on the site that captures and treats runoff from the impervious area that is being disturbed, the WQv treatment option selected must, at a minimum, provide treatment equal to the treatment that was being provided by the existing practice(s) if that treatment is greater than the treatment required by options 1 — 4 above. (ii) Channel Protection Volume (Cpv): Not required if there are no changes to hydrology that increase the discharge rate from the project site. (iii) Overbank Flood Control Criteria (Qp): Not required if there are no changes to hydrology that increase the discharge rate from the project site. 7 (Part I.C.2.c.iv) (iv) Extreme Flood Control Criteria (Qf): Not required if there are no changes to hydrology that increase the discharge rate from the project site. d. Sizing Criteria for Combination of Redevelopment Activity and New Development Construction projects that include both New Development and Redevelopment Activity shall provide post-construction stormwater management controls that meet the sizing criteria calculated as an aggregate of the Sizing Criteria in Part I.C.2.a. or b. of this permit for the New Development portion of the project and Part I.C.2.c of this permit for Redevelopment Activity portion of the project. D. Maintaining Water Quality The Department expects that compliance with the conditions of this permit will control discharges necessary to meet applicable water quality standards. It shall be a violation of the ECL for any discharge to either cause or contribute to a violation of water quality standards as contained in Parts 700 through 705 of Title 6 of the Official Compilation of Codes, Rules and Regulations of the State of New York, such as: 1. There shall be no increase in turbidity that will cause a substantial visible contrast to natural conditions; 2, There shall be no increase in suspended, colloidal or settleable solids that will cause deposition or impair the waters for their best usages; and . There shall be no residue from oil and floating substances, nor visible oil film, nor globules of grease. If there is evidence indicating that the stormwater discharges authorized by this permit are causing, have the reasonable potential to cause, or are contributing to a violation of the water quality standards; the owner or operator m ust take appropriate corrective action in accordance with Part IV.C.5. of this general permit and document in accordance with Part IV.C.4. of this general permit. To address the water quality standard violation the owner or operator may need to provide additional information, include and implement appropriate controls in the SWPPP to correct the problem, or obtain an individual SPDES permit. If there is evidence indicating that despite compliance with the terms and conditions of this general permit it is demonstrated that the stormwater discharges authorized by this permit are causing or contributing to a violation of water quality standards, or 8 (Part I.D) if the Department determines that a modification of the permit is necessary to prevent a violation of water quality standards, the authorized discharges will no longer be eligible for coverage under this permit. The Department may require the owner oroperatorto obtain an individual SPDES permit to continue discharging. E. Eligibility Under This General Permit 1. This permit may authorize all discharges of stormwater from construction activity to surface waters of the State and groundwaters except for ineligible discharges identified under subparagraph F. of this Part. 2. Except for non-stormwater discharges explicitly listed in the next paragraph, this permit only authorizes stormwater discharges from construction activities. . Notwithstanding paragraphs E.1 and E.2 above, the following non- stormwater discharges may be authorized by this permit: discharges from firefighting activities; fire hydrant flushings; waters to which cleansers or other components have not been added that are used to wash vehicles or control dust in accordance with the SWPPP, routine external building washdown which does not use detergents; pavement washwaters where spills or leaks of toxic or hazardous materials have not occurred (unless all spilled material has been removed) and where detergents are not used; air conditioning condensate; uncontaminated groundwater or spring water; uncontaminated discharges from construction site de-watering operations; and foundation or footing drains where flows are not contaminated with process materials such as solvents. For those entities required to obtain coverage under this permit, and who discharge as noted in this paragraph, and with the exception of flows from firefighting activities, these discharges must be identified in the SWPPP. Under all circumstances, the owner or operator must still comply with water quality standards in Part I.D of this permit. 4. The owner or operator must maintain permit eligibility to discharge under this permit. Any discharges that are not compliant with the eligibility conditions of this permit are not authorized by the permit and the owner or operator must either apply for a separate permit to cover those ineligible discharges or take steps necessary to make the discharge eligible for coverage. F. Activities Which Are Ineligible for Coverage Under This General Permit All of the following are not authorized by this permit- 9 (Part 15) 1., Discharges after construction activities have been completed and the site has undergone final stabilization; 2. Discharges that are mixed with sources of non-stormwater other than those expressly authorized under subsection E.3. of this Part and identified in the SWPPP required by this permit; 3. Discharges that are required to obtain an individual SPDES permit or another SPDES general permit pursuant to Part VII.K. of this permit; 4. Construction activities or discharges from construction activities that may adversely affect an endangered or threatened species unless the owner or operator has obtained a permit issued pursuant to 6 NYCRR Part 182 for the project or the Department has issued a letter of non jurisdiction for the project. All documentation necessary to demonstrate eligibility shall be maintained on site in accordance with Part II.C.2 of this permit. 5. Discharges which either cause or contribute to a violation of water quality standards adopted pursuant to the ECL and its accompanying regulations; 5. Construction activities for residential, commercial and institutional projects: a. Where the discharges from the construction activities are tributary to waters of the state classified as AA or AA-s; and b. Which disturb one or more acres of land with no existing impervious cover, and c. Which are undertaken on land with a Soil Slope Phase that is identified as an E or F, or the map unit name is inclusive of 25% or greater slope, on the United States Department of Agriculture ("USDA") Soil Survey for the County where the disturbance will occur. , Construction activities for linear transportation projects and linear utility projects: a. Where the discharges from the construction activities are tributary to waters of the state classified as AA or AA-s; and b. Which disturb two or more acres of land with no existing impervious cover, and c. Which are undertaken on land with a Soil Slope Phase that is identified as an E or F, or the map unit name is inclusive of 25% or greater slope, on the USDA Soil Survey for the County where the disturbance will occur. 10 (Part I.F.8) 8. Construction activities that have the potential to affect an historic property, unless there is documentation that such impacts have been resolved. The following documentation necessary to demonstrate eligibility with this requirement shall be maintained on site in accordance with Part II.C.2 of this permit and made available to the Department in accordance with Part VII.F of this permit: a. Documentation that the construction activity is not within an archeologically sensitive area indicated on the sensitivity map, and that the construction activity is not located on or immediately adjacent to a property listed or determined to be eligible for listing on the National or State Registers of Historic Places, and that there is no new permanent building on the construction site within the following distances from a building, structure, or object that is more than 50 years old, or if there is such a new permanent building on the construction site within those parameters that NYS Office of Parks, Recreation and Historic Preservation (OPRHP), a Historic Preservation Commission of a Certified Local Government, or a qualified preservation professional has determined that the building, structure, or object more than 50 years old is not historically/archeologically significant. ■ 1-5 acres of disturbance - 20 feet ■ 5-20 acres of disturbance - 50 feet ■ 20+ acres of disturbance - 100 feet, or b. DEC consultation form sent to OPRHP, and copied to the NYS DEC Agency Historic Preservation Officer (APO), and (i) the State Environmental Quality Review (SEAR) Environmental Assessment Form (EAF) with a negative declaration or the Findings Statement, with documentation of OPRHP's agreement with the resolution; or (ii) documentation from OPRHP that the construction activity will result in No Impact; or (iii) documentation from OPRHP providing a determination of No Adverse Impact; or (iv) a Letter of Resolution signed by the owner/operator, OPRHP and the DEC APO which allows for this construction activity to be eligible for coverage under the general permit in terms of the State Historic Preservation Act (SHPA); or c. Documentation of satisfactory compliance with Section 106 of the National Historic Preservation Act for a coterminous project area: (i) No Affect (ii) No Adverse Affect 11 (Part I.F.B.c.iii) (iii) Executed Memorandum of Agreement, or d. Documentation that: (i) SHPA Section 14.09 has been completed by NYS DEC or another state agency. . Discharges from construction activities that are subject to an existing SPDES individual or general permit where a SPDES permit for construction activity has been terminated or denied; or where the owner or operator has failed to renew an expired individual permit. Part II. OBTAINING PERMIT COVERAGE A.Notice of Intent (NOI) Submittal 1. An owner or operator of a construction activity that is not subject to the requirements of a regulated, traditional land use control MS4 must first prepare a SWPPP in accordance with all applicable requirements of this permit and then submit a completed NOI form to the Department in order to be authorized to discharge under this permit. An owner or operator shall use either the electronic (eNOI) or paper version of the NOI that the Department prepared. Both versions of the NOI are located on the Department's website (http://www.dec.ny.gov/ ). The paper version of the NOI shall be signed in accordance with Part VII.H. of this permit and submitted to the following address. NOTICE OF INTENT NYS DEC, Bureau of Water Permits 625 Broadway, 4t" Floor Albany, New York 12233-3505 2. An owner or operator of a construction activity that is subject to the requirements of a regulated, traditional land use control MS4 must first prepare a SWPPP in accordance with all applicable requirements of this permit and then have its SWPPP reviewed and accepted by the regulated, traditional land use control MS4 prior to submitting the NOI to the Department. The owner or operator shall have the "MS4 SWPPP Acceptance" form signed in accordance with Part VII.H., and then submit that form along with a completed NOI to the Department. An owner or operator shall use either the electronic (eNOI) or paper version of the NOI. The paper version of the NOI shall be signed in accordance with Part VILH. of this permit and submitted to the address in Part II.A.1. 12 (Part II.A.2) The requirement for an owner or operator to have its SWPPP reviewed and accepted by the MS4 prior to submitting the NOI to the Department does not apply to an owner or operator that is obtaining permit coverage in accordance with the requirements in Part II.E. (Change of Owner or Operator) or where the owner or operator of the construction activity is the regulated, traditional land use control MS4. 3. The owner or operator shall have the SWPPP preparer sign the "SWPPP Preparer Certification" statement on the NOI prior to submitting the form to the Department. 4. As of the date the NOI is submitted to the Department, the owner or operator shall make the NOI and SWPPP available for review and copying in accordance with the requirements in Part VII.F. of this permit. B. Permit Authorization 1. An owner or operator shall not commence construction activity until their authorization to discharge under this permit goes into effect. 2. Authorization to discharge under this permit will be effective when the owner or operator has satisfied all of the following criteria. a. project review pursuant to the State Environmental Quality Review Act ("SEQRA") have been satisfied, when SEQRA is applicable. See the Department's website (http://www.dec.ny.gov/) for more information, b. where required, all necessary Department permits subject to the Uniform Procedures Act ("UPA') (see 6 NYCRR Part 621) have been obtained, unless otherwise notified by the Department pursuant to 6 NYCRR 621.3(a)(4). Owners or operators of construction activities that are required to obtain UPA permits must submit a preliminary SWPPP to the appropriate DEC Permit Administrator at the Regional Office listed in Appendix F at the time all other necessary UPA permit applications are submitted. The preliminary SWPPP must include sufficient information to demonstrate that the construction activity qualifies for authorization under this permit, c. the final SWPPP has been prepared, and d. a complete NOI has been submitted to the Department in accordance with the requirements of this permit. 3. An owner oroperatorthat has satisfied the requirements of Part 11.B.2 above 13 (Part II.B.3) will be authorized to discharge stormwater from their construction activity in accordance with the following schedule: a. For construction activities that are not subject to the requirements of a regulated, traditional land use control MS4: (i) Five (5) business days from the date the Department receives a complete electronic version of the NOI (eNO1) for construction activities with a SWPPP that has been prepared in conformance with the design criteria in the technical standard referenced in Part III.B.1 and the performance criteria in the technical standard referenced in Parts III.B., 2 or 3, for construction activities that require post-construction stormwater management practices pursuant to Part III.C.; or (ii) Sixty (60) business days from the date the Department receives a complete NOI (electronic or paper version) for construction activities with a SWPPP that has not been prepared in conformance with the design criteria in technical standard referenced in Part III.B.1. or, for construction activities that require post-construction stormwater management practices pursuant to Part III.C., the performance criteria in the technical standard referenced in Parts III.B., 2 or 3, or; (iii) Ten (10) business days from the date the Department receives a complete paper version of the NOI for construction activities with a SWPPP that has been prepared in conformance with the design criteria in the technical standard referenced in Part III.B.1 and the performance criteria in the technical standard referenced in Parts III.B., 2 or 3, for construction activities that require post- construction stormwater management practices pursuant to Part III.C. b. For construction activities that are subject to the requirements of a regulated, traditional land use control MS4: (i) Five (5) business days from the date the Department receives both a complete electronic version of the NOI (eNO1) and signed "MS4 SWPPP Acceptance" form, or (ii) Ten (10) business days from the date the Department receives both a complete paper version of the NOI and signed "MS4 SWPPP Acceptance" form. 4. The Department may suspend or deny an owner's or operator's coverage 14 (Part II.B.4) under this permit if the Department determines that the SWPPP does not meet the permit requirements. In accordance with statute, regulation, and the terms and conditions of this permit, the Department may deny coverage under this permit and require submittal of an application for an individual SPDES permit based on a review of the NOI or other information pursuant to Part II. 5. Coverage under this permit authorizes stormwater discharges from only those areas of disturbance that are identified in the NOI. If an owner or operator wishes to have stormwater discharges from future or additional areas of disturbance authorized, they must submit a new NOI that addresses that phase of the development, unless otherwise notified by the Department. The owner or operator shall not commence construction activity on the future or additional areas until their authorization to discharge under this permit goes into effect in accordance with Part II.B. of this permit. C. General Requirements For Owners or Operators With Permit Coverage 1.. The owner or operator shall ensure that the provisions of the SWPPP are implemented from the commencement of construction activity until all areas of disturbance have achieved final stabilization and the Notice of Termination ("NOT") has been submitted to the Department in accordance with Part V. of this permit. This includes any changes made to the SWPPP pursuant to Part III.A.4. of this permit. 2. The owner or operator shall maintain a copy of the General Permit (GP-0- 15-002), NOI, NOI Acknowledgment Letter, SWPPP, MS4 SWPPP Acceptance form, inspection reports, and all documentation necessary to demonstrate eligibility with this permit at the construction site until all disturbed areas have achieved final stabilization and the NOT has been submitted to the Department. The documents must be maintained in a secure location, such as a job trailer, on-site construction office, or mailbox with lock. The secure location must be accessible during normal business hours to an individual performing a compliance inspection. . The owner or operator of a construction activity shall not disturb greater than five (5) acres of soil at any one time without prior written authorization from the Department or, in areas under the jurisdiction of a regulated, traditional land use control MS4, the regulated, traditional land use control MS4 (provided the regulated, traditional land use control MS4 is not the owner or operator of the construction activity). At a minimum, the owner or operator must comply with the following requirements in order to be authorized to disturb greater than five (5) acres of soil at any one time: a. The owner or operator shall 15 (Part II.C.3.a) have a qualified inspector conduct at least two (2) site inspections in accordance with Part IV.C. of this permit every seven (7) calendar days, for as long as greater than five (5) acres of soil remain disturbed. The two (2) inspections shall be separated by a minimum of two (2) full calendar days. b. In areas where soil disturbance activity has temporarily or permanently ceased, the application of soil stabilization measures must be initiated by the end of the next business day and completed within seven (7) days from the date the current soil disturbance activity ceased. The soil stabilization measures selected shall be in conformance with the technical standard, New York State Standards and Specifications for Erosion and Sediment Control, dated August 2005. c. The owner or operator shall prepare a phasing plan that defines maximum disturbed area per phase and shows required cuts and fills. d. The owner or operator shall install any additional site specific practices needed to protect water quality. e. The owner or operator shall include the requirements above in their SWPPP. 4. In accordance with statute, regulations, and the terms and conditions of this permit, the Department may suspend or revoke an owner's or operator's coverage under this permit at any time if the Department determines that the SWPPP does not meet the permit requirements. Upon a finding of significant non-compliance with the practices described in the SWPPP or violation of this permit, the Department may order an immediate stop to all activity at the site until the non-compliance is remedied. The stop work order shall be in writing, describe the non-compliance in detail, and be sent to the owner or operator. . For construction activities that are subject to the requirements of a regulated, traditional land use control MS4, the owner or operator shall notify the regulated, traditional land use control MS4 in writing of any planned amendments or modifications to the post-construction stormwater management practice component of the SWPPP required by Part IIIA. 4. and 5. of this permit. Unless otherwise notified by the regulated, traditional land use control MS4, the owner or operator shall have the SWPPP amendments or modifications reviewed and accepted by the regulated, traditional land use control MS4 prior to commencing construction of the post-construction stormwater management practice 16 (Part II.D) D. Permit Coverage for Discharges Authorized Under GP-0-10-001 1., Upon renewal of SPDES General Permit for Stormwater Discharges from Construction Activity (Permit No. GP-0-10-001), an owner or operator of a construction activity with coverage under GP-0-10-001, as of the effective date of GP-0-15-002, shall be authorized to discharge in accordance with GP-0-15-002, unless otherwise notified by the Department. An owner or operator may continue to implement the technical/design components of the post-construction stormwater management controls provided that such design was done in conformance with the technical standards in place at the time of initial project authorization. However, they must comply with the other, non-design provisions of GP-0-15-002. E. Change of Owner or Operator 2, When property ownership changes or when there is a change in operational control over the construction plans and specifications, the original owner or operator must notify the new owner or operator, in writing, of the requirement to obtain permit coverage by submitting a NOI with the Department. Once the new owner or operator obtains permit coverage, the original owner or operator shal I then submit a completed NOT with the name and permit identification number of the new owner or operator to the Department at the address in Part II.A.1. of this permit. If the original owner or operator maintains ownership of a portion of the construction activity and will disturb soil, they must maintain their coverage under the permit. Permit coverage for the new owner or operator will be effective as of the date the Department receives a complete NOI, provided the original owner or operatorwas not subject to a sixty (60) business day authorization period that has not expired as of the date the Department receives the NOI from the new owner or operator. 17 (Part III) Part III. STORMWATER POLLUTION PREVENTION PLAN (SWPPP) A. General SWPPP Requirements 1. A SWPPP shall be prepared and implemented by the owner or operator of each construction activity covered by this permit. The SWPPP must document the selection, design, installation, implementation and maintenance of the control measures and practices that will be used to meet the effluent limitations in Part I.B. of this permit and where applicable, the post-construction stormwater management practice requirements in Part I.C. of this permit. The SWPPP shall be prepared prior to the submittal of the NOI. The NOI shall be submitted to the Department prior to the commencement of construction activity. A copy of the completed, final NOI shall be included in the SWPPP. . The SWPPP shall describe the erosion and sediment control practices and where required, post-construction stormwater management practices that will be used and/or constructed to reduce the pollutants in stormwater discharges and to assure compliance with the terms and conditions of this permit. In addition, the SWPPP shall identify potential sources of pollution which may reasonably be expected to affect the quality of stormwater discharges. . All SWPPPs that require the post-construction stormwater management practice component shall be prepared by a qualified professional that is knowledgeable in the principles and practices of stormwater management and treatment. 4. The owner or operator must keep the SWPPP current so that it at all times accurately documents the erosion and sediment controls practices that are being used or will be used during construction, and all post-construction stormwater management practices that will be constructed on the site. At a minimum, the owner or operator shall amend the SWPPP: a. whenever the current provisions prove to be ineffective in minimizing pollutants in stormwater discharges from the site; b. whenever there is a change in design, construction, or operation at the construction site that has or could have an effect on the discharge of pollutants; and c. to address issues or deficiencies identified during an inspection by the qualified inspector, the Department or other regulatory authority. . The Department may notify the owner or operator at any time that the 18 (Part III.A.5) SWPPP does not meet one or more of the minimum requirements of this permit. The notification shall be in writing and identify the provisions of the SWPPP that require modification. Within fourteen (14) calendar days of such notification, or as otherwise indicated by the Department, the owner or operator shall make the required changes to the SWPPP and submit written notification to the Department that the changes have been made. If the owner or operator does not respond to the Department's comments in the specified time frame, the Department may suspend the owner's or operator's coverage under this permit or require the owner or operator to obtain coverage under an individual SPDES permit in accordance with Part II.C.4. of this permit. .. Prior to the commencement of construction activity, the owner or operator must identify the contractor(s) and subcontractor(s) that will be responsible for installing, constructing, repairing, replacing, inspecting and maintaining the erosion and sediment control practices included in the SWPPP; and the contractor(s) and subcontractor(s) that will be responsible for constructing the post-construction stormwater management practices included in the SWPPP. The owner or operator shall have each of the contractors and subcontractors identify at least one person from their company that will be responsible for implementation of the SWPPP. This person shall be known as the trained contractor. The owner or operator shall ensure that at least one trained contractor is on site on a daily basis when soil disturbance activities are being performed. The owner or operator shall have each of the contractors and subcontractors identified above sign a copy of the following certification statement below before they commence any construction activity: "I hereby certify under penalty of law that I understand and agree to comply with the terms and conditions of the SWPPP and agree to implement any corrective actions identified by the qualified inspector during a site inspection. I also understand that the owner or operator must comply with the terms and conditions of the most current version of the New York State Pollutant Discharge Elimination System ("SPDES") general permit for stormwater discharges from construction activities and that it is unlawful for any person to cause or contribute to a violation of water quality standards. Furthermore, I am aware that there are significant penalties for submitting false information, that I do not believe to be true, including the possibility of fine and imprisonment for knowing violations" In addition to providing the certification statement above, the certification page must also identify the specific elements of the SWPPP that each contractor and subcontractor will be responsible for and include the name and title of the person providing the signature; the name and title of the 19 (Part III.A.6) trained contractor responsible for SWPPP implementation; the name, address and telephone number of the contracting firm; the address (or other identifying description) of the site; and the date the certification statement is signed. The owner or operator shall attach the certification statement(s) to the copy of the SWPPP that is maintained at the construction site. If new or additional contractors are hired to implement measures identified in the SWPPP after construction has commenced, they must also sign the certification statement and provide the information listed above. 7. For projects where the Department requests a copy of the SWPPP or inspection reports, the owner or operator shal I submit the documents in both electronic (PDF only) and paper format within five (5) business days, unless otherwise notified by the Department. B. Required SWPPP Contents 1.. Erosion and sediment control component -All SWPPPs prepared pursuant to this permit shall include erosion and sediment control practices designed in conformance with the technical standard, New York State Standards and Specifications for Erosion and Sediment Control, dated August 2005. Where erosion and sediment control practices are not designed in conformance with the design criteria included in the technical standard, the owner oroperatormust demonstrate equivalence to the technical standard. At a minimum, the erosion and sediment control component of the SWPPP shall include the following: a. Background information about the scope of the project, including the location, type and size of project; b. A site map/construction drawing(s) for the project, including a general location map. At a minimum, the site map shall show the total site area; all improvements; areas of disturbance; areas that will not be disturbed; existing vegetation; on-site and adjacent off-site surface water(s); flood plain/floodway boundaries; wetlands and drainage patterns that could be affected by the construction activity; existing and final contours ; locations of different soil types with boundaries; material, waste, borrow or equipment storage areas located on adjacent properties; and location(s) of the stormwater discharge(s); c. A description of the soil(s) present at the site, including an identification of the Hydrologic Soil Group (HSG); d. A construction phasing plan and sequence of operations describing the intended order of construction activities, including clearing and grubbing, excavation and grading, utility and infrastructure installation and any other 20 (Part III.B.1.d) activity at the site that results in soil disturbance; e. A description of the minimum erosion and sediment control practices to be installed or implemented for each construction activity that will result in soil disturbance. Include a schedule that identifies the timing of initial placement or implementation of each erosion and sediment control practice and the minimum time frames that each practice should remain in place or be implemented; f. A temporary and permanent soil stabilization plan that meets the requirements of this general permit and the technical standard, New York State Standards and Specifications for Erosion and Sediment Control, dated August 2005, for each stage of the project, including initial land clearing and grubbing to project completion and achievement of final stabilization; g. A site map/construction drawing(s) showing the specific location(s), size(s), and length(s) of each erosion and sediment control practice; h. The dimensions, material specifications, installation details, and operation and maintenance requirements for all erosion and sediment control practices. Include the location and sizing of any temporary sediment basins and structural practices that will be used to divert flows from exposed soils; i. A maintenance inspection schedule for the contractor(s) identified in Part III.A.6. of this permit, to ensure continuous and effective operation of the erosion and sediment control practices. The maintenance inspection schedule shall be in accordance with the requirements in the technical standard, New York State Standards and Specifications for Erosion and Sediment Control, dated August 2005; j. A description of the pollution prevention measures that will be used to control litter, construction chemicals and construction debris from becoming a pollutant source in the stormwater discharges; k. A description and location of any stormwater discharges associated with industrial activity other than construction at the site, including, but not limited to, stormwater discharges from asphalt plants and concrete plants located on the construction site; and I. Identification of any elements of the design that are not in conformance with the design criteria in the technical standard, New York State Standards and Specifications for Erosion and Sediment Control, dated August 2005. Include the reason for the deviation or alternative design 21 (Part III.B.1.1) and provide information which demonstrates that the deviation or alternative design is equivalent to the technical standard. 2. Post-construction stormwater management practice component — The owner or operator of any construction project identified in Table 2 of Appendix B as needing post-construction stormwater management practices shall prepare a SWPPP that includes practices designed in conformance with the applicable sizing criteria in Part I.C.2.a., c. or d. of this permit and the performance criteria in the technical standard, New York State Stormwater Management Design Manual dated January 2015 Where post-construction stormwater management practices are not designed in conformance with the performance criteria in the technical standard, the owner or operator must include in the SWPPP the reason(s) for the deviation or alternative design and provide information which demonstrates that the deviation or alternative design is equivalent to the technical standard. The post-construction stormwater management practice component of the SWPPP shall include the following: a. Identification of all post-construction stormwater management practices to be constructed as part of the project. Include the dimensions, material specifications and installation details for each post-construction stormwater management practice; b. A site map/construction drawing(s) showing the specific location and size of each post-construction stormwater management practice; c. A Stormwater Modeling and Analysis Report that includes: (i) Map(s) showing pre-development conditions, including watershed/subcatchments boundaries, flow paths/routing, and design points; (ii) Map(s) showing post-development conditions, including watershed/subcatchments boundaries, flow paths/routing, design points and post-construction stormwater management practices; (iii) Results of stormwater modeling (i.e. hydrology and hydraulic analysis) for the required storm events. Include supporting calculations (model runs), methodology, and a summary table that compares pre and post-development runoff rates and volumes for the different storm events; (iv) Summary table, with supporting calculations, which demonstrates 22 (Part III.B.2.c.iv) that each post-construction stormwater management practice has been designed in conformance with the sizing criteria included in the Design Manual; (v) Identification of any sizing criteria that is not required based on the requirements included in Part I.C. of this permit; and (vi) Identification of any elements of the design that are not in conformance with the performance criteria in the Design Manual. Include the reason(s) for the deviation or alternative design and provide information which demonstrates that the deviation or alternative design is equivalent to the Design Manual; d. Soil testing results and locations (test pits, borings); e. Infiltration test results, when required; and f. An operations and maintenance plan that includes inspection and maintenance schedules and actions to ensure continuous and effective operation of each post-construction stormwater management practice. The plan shall identify the entity that will be responsible for the long term operation and maintenance of each practice. . Enhanced Phosphorus Removal Standards - All construction projects identified in Table 2 of Appendix B that are located in the watersheds identified in Appendix C shall prepare a SWPPP that includes post- construction stormwater management practices designed in conformance with the applicable sizing criteria in Part I.C.2. b., c. or d. of this permit and the performance criteria, Enhanced Phosphorus Removal Standards included in the Design Manual. At a minimum, the post-construction stormwater management practice component of the SWPPP shall include items 2.a - 2.f. above. C. Required SWPPP Components by Project Type Unless otherwise notified by the Department, owners or operators of construction activities identified in Table 1 of Appendix B are required to prepare a SWPPP that only includes erosion and sediment control practices designed in conformance with Part III.B.1 of this permit. Owners oroperators of the construction activities identified in Table 2 of Appendix B shall prepare a SWPPP that also includes post-construction stormwater management practices designed in conformance with Part I I I.B.2 or 3 of this permit. 23 (Part IV) Part IV. INSPECTION AND MAINTENANCE REQUIREMENTS A. General Construction Site Inspection and Maintenance Requirements 1. The owner or operator must ensure that all erosion and sediment control practices (including pollution prevention measures) and all post- construction stormwater management practices identified in the SWPPP are inspected and maintained in accordance with Part IV.B. and C. of this permit. 2. The terms of this permit shall not be construed to prohibit the State of New York from exercising any authority pursuant to the ECL, common law or federal law, or prohibit New York State from taking any measures, whether civil or criminal, to prevent violations of the laws of the State of New York, or protect the public health and safety and/or the environment. B. Contractor Maintenance Inspection Requirements 1. The owner or operator of each construction activity identified in Tables 1 and 2 of Appendix B shall have a trained contractor inspect the erosion and sediment control practices and pollution prevention measures being implemented within the active work area daily to ensure that they are being maintained in effective operating condition at all times. If deficiencies are identified, the contractor shall begin implementing corrective actions within one business day and shall complete the corrective actions in a reasonable time frame. 2. For construction sites where soil disturbance activities have been temporarily suspended (e.g. winter shutdown) and temporary stabilization measures have been applied to all disturbed areas, the trained contractor can stop conducting the maintenance inspections. The trained contractor shall begin conducting the maintenance inspections in accordance with Part IV.B.1. of this permit as soon as soil disturbance activities resume. . For construction sites where soil disturbance activities have been shut down with partial project completion, the trained contractor can stop conducting the maintenance inspections if all areas disturbed as of the project shutdown date have achieved final stabilization and all post-construction stormwater management practices required for the completed portion of the project have been constructed in conformance with the SWPPP and are operational. C. Qualified Inspector Inspection Requirements 24 (Part IV.C) The owner or operator shall have a qualified inspector conduct site inspections in conformance with the following requirements: [Note: The trained contractor identified in Part III.A.6. and IV.B. of this permit cannot conduct the qualified inspector site inspections unless they meet the qualified inspector qualifications included in Appendix A. In orderto perform these inspections, the trained contractorwould have to be a- - licensed Professional Engineer, - Certified Professional in Erosion and Sediment Control (CPESC), - Registered Landscape Architect, or -someone working under the direct supervision of, and at the same company as, the licensed Professional Engineer or Registered Landscape Architect, provided they have received four (4) hours of Department endorsed training in proper erosion and sediment control principles from a Soil and Water Conservation District, or other Department endorsed entity]. 1. A qualified inspector shall conduct site inspections for all construction activities identified in Tables 1 and 2 of Appendix B, with the exception of: a. the construction of a single family residential subdivision with 25% or less impervious cover at total site build-out that involves a soil disturbance of one (1)or more acres of land but less than five (5) acres and is not located in one of the watersheds listed in Appendix C and not directly discharging to one of the 303(d) segments listed in Appendix E; b. the construction of a single family home that involves a soil disturbance of one (1)or more acres of land but less than five (5) acres and is not located in one of the watersheds listed in Appendix C and not directly discharging to one of the 303(d) segments listed in Appendix E; c. construction on agricultural property that involves a soil disturbance of one (1) or more acres of land but less than five (5) acres; and d. construction activities located in the watersheds identified in Appendix D that involve soil disturbances between five thousand (5,000) square feet and one (1) acre of land. 2. Unless otherwise notified by the Department, the qualified inspector shall conduct site inspections in accordance with the following timetable. a. For construction sites where soil disturbance activities are on-going, the qualified inspector shall conduct a site inspection at least once every seven (7) calendar days. b. For construction sites where soil disturbance activities are on-going and 25 (Part IV.C.2.b) the owner or operator has received authorization in accordance with Part II.C.3 to disturb greater than five (5) acres of soil at any one time, the qualified inspector shall conduct at least two (2) site inspections every seven (7) calendar days. The two (2) inspections shall be separated by a minimum of two (2) full calendar days. c. For construction sites where soil disturbance activities have been temporarily suspended (e.g. winter shutdown) and temporary stabilization measures have been applied to all disturbed areas, the qualified inspector shall conduct a site inspection at least once every thirty (30) calendar days. The owner or operator shall notify the DOW Water (SPDES) Program contact at the Regional Office (see contact information in Appendix F) or, in areas under the jurisdiction of a regulated, traditional land use control MS4, the regulated, traditional land use control MS4 (provided the regulated, traditional land use control MS4 is not the owner or operator of the construction activity) in writing prior to reducing the frequency of inspections. d. For construction sites where soil disturbance activities have been shut down with partial project completion, the qualified inspector can stop conducting inspections if all areas disturbed as of the project shutdown date have achieved final stabilization and all post-construction stormwater management practices required for the completed portion of the project have been constructed in conformance with the SWPPP and are operational. The owner or operator shall notify the DOW Water (SPDES) Program contact at the Regional Office (see contact information in Appendix F) or, in areas under the jurisdiction of a regulated, traditional land use control MS4, the regulated, traditional land use control MS4 (provided the regulated, traditional land use control MS4 is not the owner or operator of the construction activity) in writing prior to the shutdown. If soil disturbance activities are not resumed within 2 years from the date of shutdown, the owner or operator shall have the qualified inspector perform a final inspection and certify that all disturbed areas have achieved final stabilization, and all temporary, structural erosion and sediment control measures have been removed, and that all post-construction stormwater management practices have been constructed in conformance with the SWPPP by signing the "Final Stabilization" and "Post-Construction Stormwater Management Practice" certification statements on the NOT. The owner or operator shall then submit the completed NOT form to the address in Part II.A.1 of this permit. e. For construction sites that directly discharge to one of the 303(d) segments listed in Appendix E or is located in one of the watersheds listed in Appendix C, the qualified inspector shall conduct at least two (2) site inspections every seven (7) calendar days. The two (2) inspections shall 26 (Part IV.C.2.e) be separated by a minimum of two (2) full calendar days. . At a minimum, the qualified inspectorshall inspect all erosion and sediment control practices and pollution prevention measures to ensure integrity and effectiveness, all post-construction stormwater management practices under construction to ensure that they are constructed in conformance with the SWPPP, all areas of disturbance that have not achieved final stabilization, all points of discharge to natural surface waterbodies located within, or immediately adjacent to, the property boundaries of the construction site, and all points of discharge from the construction site. 4. The qualified inspector shall prepare an inspection report subsequent to each and every inspection. At a minimum, the inspection report shall include and/or address the following: a. Date and time of inspection; b. Name and title of person(s) performing inspection; c. A description of the weather and soil conditions (e.g. dry, wet, saturated) at the time of the inspection; d. A description of the condition of the runoff at all points of discharge from the construction site. This shall include identification of any discharges of sediment from the construction site. Include discharges from conveyance systems (i.e. pipes, culverts, ditches, etc.) and overland flow; e. A description of the condition of all natural surface waterbodies located within, or immediately adjacent to, the property boundaries of the construction site which receive runoff from disturbed areas. This shall include identification of any discharges of sediment to the surface waterbody; f. Identification of all erosion and sediment control practices and pollution prevention measures that need repair or maintenance; g. Identification of all erosion and sediment control practices and pollution prevention measures that were not installed properly or are not functioning as designed and need to be reinstalled or replaced; h. Description and sketch of areas with active soil disturbance activity, areas that have been disturbed but are inactive at the time of the inspection, and areas that have been stabilized (temporary and/or final) since the last inspection; 27 (Part IV.C.4.i) i. Current phase of construction of all post-construction stormwater management practices and identification of all construction that is not in conformance with the SWPPP and technical standards; j. Corrective action(s) that must be taken to install, repair, replace or maintain erosion and sediment control practices and pollution prevention measures; and to correct deficiencies identified with the construction of the post-construction stormwater management practice(s); k. Identification and status of all corrective actions that were required by previous inspection; and I. Digital photographs, with date stamp, that clearly show the condition of all practices that have been identified as needing corrective actions. The qualified inspector shall attach paper color copies of the digital photographs to the inspection report being maintained onsite within seven (7) calendar days of the date of the inspection. The qualified inspector shall also take digital photographs, with date stamp, that clearly show the condition of the practice(s) after the corrective action has been completed. The qualified inspector shall attach paper color copies of the digital photographs to the inspection report that documents the completion of the corrective action work within seven (7) calendar days of that inspection. 5. Within one business day of the completion of an inspection, the qualified inspector shall notify the owner or operator and appropriate contractor or subcontractor identified in Part III.A.6. of this permit of any corrective actions that need to be taken. The contractor or subcontractor shall begin implementing the corrective actions within one business day of this notification and shall complete the corrective actions in a reasonable time frame. 5. All inspection reports shall be signed by the qualified inspector. Pursuant to Part II.C.2. of this permit, the inspection reports shall be maintained on site with the SWPPP. Part V. TERMINATION OF PERMIT COVERAGE A. Termination of Permit Coverage 1, An owner or operator that is eligible to terminate coverage under this permit must submit a completed NOT form to the address in Part II.A.1 of this permit. The NOT form shall be one which is associated with this permit, signed in accordance with Part VII.H of this permit. 28 (Part V.A.2) 2, An owner or operator may terminate coverage when one or more the following conditions have been met- a. Total project completion -All construction activity identified in the SWPPP has been completed; and all areas of disturbance have achieved final stabilization; and all temporary, structural erosion and sediment control measures have been removed; and all post-construction stormwater management practices have been constructed in conformance with the SWPPP and are operational; b. Planned shutdown with partial project completion - All soil disturbance activities have ceased; and all areas disturbed as of the project shutdown date have achieved final stabilization; and all temporary, structural erosion and sediment control measures have been removed; and all post- construction stormwater management practices required for the completed portion of the project have been constructed in conformance with the SWPPP and are operational; c. A new owner or operator has obtained coverage under this permit in accordance with Part II.E. of this permit. d. The owner or operator obtains coverage under an alternative SPDES general permit or an individual SPDES permit. 3. For construction activities meeting subdivision 2a. or 2b. of this Part, the owner or operator shall have the qualified inspector perform a final site inspection prior to submitting the NOT. The qualified inspector shall, by signing the "Final Stabilization" and "Post-Construction Stormwater Management Practice certification statements on the NOT, certify that all the requirements in Part V.A.2.a. or b. of this permit have been achieved. 4, For construction activities that are subject to the requirements of a regulated, traditional land use control MS4 and meet subdivision 2a. or 2b. of this Part, the owner or operator shall have the regulated, traditional land use control MS4 sign the "MS4 Acceptance" statement on the NOT in accordance with the requirements in Part VII.H. of this permit. The regulated, traditional land use control MS4 official, by signing this statement, has determined that it is acceptable for the owner or operator to submit the NOT in accordance with the requirements of this Part. The regulated, traditional land use control MS4 can make this determination by performing a final site inspection themselves or by accepting the qualified inspector's final site inspection certification(s) required in Part V.A.3. of this permit. 29 (Part V.A.5) 5. For construction activities that require post-construction stormwater management practices and meet subdivision 2a. of this Part, the owner or operator must, prior to submitting the NOT, ensure one of the following: a. the post-construction stormwater management practice(s) and any right- of-way(s) needed to maintain such practice(s) have been deeded to the municipality in which the practice(s) is located, b. an executed maintenance agreement is in place with the municipality that will maintain the post-construction stormwater management practice(s), c. for post-construction stormwater management practices that are privately owned, the owner or operator has a mechanism in place that requires operation and maintenance of the practice(s) in accordance with the operation and maintenance plan, such as a deed covenant in the owner or operator's deed of record, d. for post-construction stormwater management practices that are owned by a public or private institution (e.g. school, university, hospital), government agency or authority, or public utility; the owner or operator has policy and procedures in place that ensures operation and maintenance of the practices in accordance with the operation and maintenance plan. Part VI. REPORTING AND RETENTION OF RECORDS A. Record Retention The owner or operator shall retain a copy of the NOI, NOI Acknowledgment Letter, SWPPP, MS4 SWPPP Acceptance form and any inspection reports that were prepared in conjunction with this permit for a period of at least five (5) years from the date that the Department receives a complete NOT submitted in accordance with Part V. of this general permit. B. Addresses With the exception of the NOI, NOT, and MS4 SWPPP Acceptance form (which must be submitted to the address referenced in Part II.A.1 of this permit), all written correspondence requested by the Department, including individual permit applications, shall be sent to the address of the appropriate DOW Water (SPDES) Program contact at the Regional Office listed in Appendix F. 30 (Part VII) Part VII. STANDARD PERMIT CONDITIONS A. Duty to Comply The owner or operator must comply with all conditions of this permit. All contractors and subcontractors associated with the project must comply with the terms of the SWPPP. Any non-compliance with this permit constitutes a violation of the Clean Water Act (CWA) and the ECL and is grounds for an enforcement action against the owner or operator and/or the contractor/subcontractor; permit revocation, suspension or modification; or denial of a permit renewal application. Upon a finding of significant non-compliance with this permit or the applicable SWPPP, the Department may order an immediate stop to all construction activity at the site until the non-compliance is remedied. The stop work order shall be in writing, shall describe the non-compliance in detail, and shall be sent to the owner or operator. If any human remains or archaeological remains are encountered during excavation, the owner or operator must immediately cease, or cause to cease, all construction activity in the area of the remains and notify the appropriate Regional Water Engineer (RWE). Construction activity shall not resume until written permission to do so has been received from the RWE. B. Continuation of the Expired General Permit This permit expires five (5) years from the effective date. If a new general permit is not issued prior to the expiration of this general permit, an owner or operator with coverage under this permit may continue to operate and discharge in accordance with the terms and conditions of this general permit, if it is extended pursuant to the State Administrative Procedure Act and 6 NYCRR Part 621, until a new general permit is issued. C. Enforcement Failure of the owner or operator, its contractors, subcontractors, agents and/or assigns to strictly adhere to any of the permit requirements contained herein shall constitute a violation of this permit. There are substantial criminal, civil, and administrative penalties associated with violating the provisions of this permit. Fines of up to $37,500 per day for each violation and imprisonment for up to fifteen (15) years may be assessed depending upon the nature and degree of the offense. D. Need to Halt or Reduce Activity Not a Defense It shall not be a defense for an owner or operator in an enforcement action that it would have been necessary to halt or reduce the construction activity in order to maintain compliance with the conditions of this permit. 31 (Part VILE) E. Duty to Mitigate The owner or operator and its contractors and subcontractors shall take all reasonable steps to minimize or prevent any discharge in violation of this permit which has a reasonable likelihood of adversely affecting human health or the environment. F. Duty to Provide Information The owner or operator shall furnish to the Department, within a reasonable specified time period of a written request, all documentation necessary to demonstrate eligibility and any information to determine compliance with this permit or to determine whether cause exists for modifying or revoking this permit, or suspending or denying coverage under this permit, in accordance with the terms and conditions of this permit. The NOI, SWPPP and inspection reports required by this permit are public documents that the owner or operator must make available for review and copying by any person within five (5) business days of the owner or operator receiving a written request by any such person to review these documents. Copying of documents will be done at the requester's expense. G. Other Information When the owner or operator becomes aware that they failed to submit any relevant facts, or submitted incorrect information in the NOI or in any of the documents required by this permit , or have made substantive revisions to the SWPPP (e.g. the scope of the project changes significantly, the type of post-construction stormwater management practice(s) changes, there is a reduction in the sizing of the post- construction stormwater management practice, or there is an increase in the disturbance area or impervious area), which were not reflected in the original NOI submitted to the Department, they shall promptly submit such facts or information to the Department using the contact information in Part II.A. of this permit. Failure of the owner or operator to correct or supplement any relevant facts within five (5) business days of becoming aware of the deficiency shall constitute a violation of this permit. H. Signatory Requirements 1. All NOls and NOTs shall be signed as follows: a. For a corporation these forms shall be signed by a responsible corporate officer. For the purpose of this section, a responsible corporate officer means: (i) a president, secretary, treasurer, or vice-president of the 32 (Part VII.H.1.a.i) corporation in charge of a principal business function, or any other person who performs similar policy or decision-making functions for the corporation; or (ii) the manager of one or more manufacturing, production or operating facilities, provided the manager is authorized to make management decisions which govern the operation of the regulated facility including having the explicit or implicit duty of making major capital investment recommendations, and initiating and directing other comprehensive measures to assure long term environmental compliance with environmental laws and regulations; the manager can ensure that the necessary systems are established or actions taken to gather complete and accurate information for permit application requirements; and where authority to sign documents has been assigned or delegated to the manager in accordance with corporate procedures; b. For a partnership or sole proprietorship these forms shall be signed by a general partner or the proprietor, respectively; or c. For a municipality, State, Federal, or other public agency these forms shall be signed by either a principal executive officer or ranking elected official. For purposes of this section, a principal executive officer of a Federal agency includes: (i) the chief executive officer of the agency, or (ii) a senior executive officer having responsibility for the overall operations of a principal geographic unit of the agency (e.g., Regional Administrators of EPA). , The SWPPP and other information requested by the Department shall be signed by a person described in Part VII.H.1. of this permit or by a duly authorized representative of that person. A person is a duly authorized representative only if: a. The authorization is made in writing by a person described in Part VI I.H.1. of this permit; b. The authorization specifies either an individual or a position having responsibility for the overall operation of the regulated facility or activity, such as the position of plant manager, operator of a well or a well field, superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters for the company. (A duly authorized representative may thus be either a named 33 (Part VII.H.2.b) individual or any individual occupying a named position) and, c. The written authorization shall include the name, title and signature of the authorized representative and be attached to the SWPPP. 3. All inspection reports shall be signed by the qualified inspector that performs the inspection. 4, The MS4 SWPPP Acceptance form shall be signed by the principal executive officer or ranking elected official from the regulated, traditional land use control MS4, or by a duly authorized representative of that person. It shall constitute a permit violation if an incorrect and/or improper signatory authorizes any required forms, SWPPP and/or inspection reports. I. Property Rights The issuance of this permit does not convey any property rights of any sort, nor any exclusive privileges, nor does it authorize any injury to private property nor any invasion of personal rights, nor any infringement of Federal, State or local laws or regulations. Owners or operators must obtain any applicable conveyances, easements, licenses and/or access to real property prior to commencing construction activity. J. Severability The provisions of this permit are severable, and if any provision of this permit, or the application of any provision of this permit to any circumstance, is held invalid, the application of such provision to other circumstances, and the remainder of this permit shall not be affected thereby. K. Requirement to Obtain Coverage Under an Alternative Permit 1. The Department may require any owner or operator authorized by this permit to apply for and/or obtain either an individual SPDES permit or another SPDES general permit. When the Department requires any discharger authorized by a general permit to apply for an individual SPDES permit, it shall notify the discharger in writing that a permit application is required. This notice shall include a brief statement of the reasons for this decision, an application form, a statement setting a time frame for the owner or operator to file the application for an individual SPDES permit, and a deadline, not sooner than 180 days from owner or operator receipt of the notification letter, whereby the authorization to 34 (Part VII.K.1) discharge under this general permit shall be terminated. Applications must be submitted to the appropriate Permit Administrator at the Regional Office. The Department may grant additional time upon demonstration, to the satisfaction of the Department, that additional time to apply for an alternative authorization is necessary or where the Department has not provided a permit determination in accordance with Part 621 of this Title. 2. When an individual SPDES permit is issued to a discharger authorized to discharge under a general SPDES permit for the same discharge(s), the general permit authorization for outfalls authorized under the individual SPDES permit is automatically terminated on the effective date of the individual permit unless termination is earlier in accordance with 6 NYCRR Part 750. L. Proper Operation and Maintenance The owner or operator shall at all times properly operate and maintain all facilities and systems of treatment and control (and related appurtenances) which are installed or used by the owneroroperatorto achieve compliance with the conditions of this permit and with the requirements of the SWPPP. M. Inspection and Entry The owner or operator shall allow an authorized representative of the Department, EPA, applicable county health department, or, in the case of a construction site which discharges through an MS4, an authorized representative of the MS4 receiving the discharge, upon the presentation of credentials and other documents as may be required by law, to: 1. Enter upon the owner's or operator's premises where a regulated facility or activity is located or conducted or where records must be kept under the conditions of this permit; 2, Have access to and copy at reasonable times, any records that must be kept under the conditions of this permit; and 3. Inspect at reasonable times any facilities or equipment(including monitoring and control equipment), practices or operations regulated or required by this permit. 4. Sample or monitor at reasonable times, for purposes of assuring permit compliance or as otherwise authorized by the Act or ECL, any substances or parameters at any location. 35 (Part VII.N) N. Permit Actions This permit may, at any time, be modified, suspended, revoked, or renewed by the Department in accordance with 6 NYCRR Part 621. The filing of a request by the owner or operator for a permit modification, revocation and reissuance, termination, a notification of planned changes or anticipated noncompliance does not limit, diminish and/or stay compliance with any terms of this permit. O. Definitions Definitions of key terms are included in Appendix A of this permit. P. Re-Opener Clause 1. If there is evidence indicating potential or realized impacts on water quality due to any stormwater discharge associated with construction activity covered by this permit, the owner or operator of such discharge may be required to obtain an individual permit or alternative general permit in accordance with Part VII.K. of this permit or the permit may be modified to include different limitations and/or requirements. 2. Any Department initiated permit modification, suspension or revocation will be conducted in accordance with 6 NYCRR Part 621, 6 NYCRR 750-1.18, and 6 NYCRR 750-1.20. Q. Penalties for Falsification of Forms and Reports In accordance with 6NYCRR Part 750-2.4 and 750-2.5, any person who knowingly makes any false material statement, representation, or certification in any application, record, report or other document filed or required to be maintained under this permit, including reports of compliance or noncompliance shall, upon conviction, be punished in accordance with ECL §71-1933 and or Articles 175 and 210 of the New York State Penal Law. R. Other Permits Nothing in this permit relieves the owner or operator from a requirement to obtain any other permits required by law. 36 APPENDIX A Definitions Alter Hydrology from Pre to Post-Development Conditions - means the post- development peak flow rate(s) has increased by more than 5% of the pre-developed condition for the design storm of interest (e.g. 10 yr and 100 yr). Combined Sewer - means a sewer that is designed to collect and convey both "sewage" and "stormwater'. Commence (Commencement of) Construction Activities - means the initial disturbance of soils associated with clearing, grading or excavation activities; or other construction related activities that disturb or expose soils such as demolition, stockpiling of fill material, and the initial installation of erosion and sediment control practices required in the SWPPP. See definition for"Construction Activity(ies)" also. Construction Activity(ies) - means any clearing, grading, excavation, filling, demolition or stockpiling activities that result in soil disturbance. Clearing activities can include, but are not limited to, logging equipment operation, the cutting and skidding of trees, stump removal and/or brush root removal. Construction activity does not include routine maintenance that is performed to maintain the original line and grade, hydraulic capacity, or original purpose of a facility. Direct Discharge (to a specific surface waterbody) - means that runoff flows from a construction site by overland flow and the first point of discharge is the specific surface waterbody, or runoff flows from a construction site to a separate storm sewer system and the first point of discharge from the separate storm sewer system is the specific surface waterbody. Discharge(s) - means any addition of any pollutant to waters of the State through an outlet or point source. Environmental Conservation Law (ECL) - means chapter 43-B of the Consolidated Laws of the State of New York, entitled the Environmental Conservation Law. Equivalent (Equivalence) — means that the practice or measure meets all the performance, longevity, maintenance, and safety objectives of the technical standard and will provide an equal or greater degree of water quality protection. Final Stabilization - means that all soil disturbance activities have ceased and a uniform, perennial vegetative cover with a density of eighty (80) percent over the entire pervious surface has been established; or other equivalent stabilization measures, such as permanent landscape mulches, rock rip-rap or washed/crushed stone have been applied 37 on all disturbed areas that are not covered by permanent structures, concrete or pavement. General SPDES permit - means a SPDES permit issued pursuant to 6 NYCRR Part 750- 1.21 and Section 70-0117 of the ECL authorizing a category of discharges. Groundwater(s) - means waters in the saturated zone. The saturated zone is a subsurface zone in which all the interstices are filled with water under pressure greater than that of the atmosphere. Although the zone may contain gas-filled interstices or interstices filled with fluids other than water, it is still considered saturated. Historic Property— means any building, structure, site, object or district that is listed on the State or National Registers of Historic Places or is determined to be eligible for listing on the State or National Registers of Historic Places. Impervious Area (Cover) - means all impermeable surfaces that cannot effectively infiltrate rainfall. This includes paved, concrete and gravel surfaces (i.e. parking lots, driveways, roads, runways and sidewalks); building rooftops and miscellaneous impermeable structures such as patios, pools, and sheds. Infeasible — means not technologically possible, or not economically practicable and achievable in light of best industry practices. Larger Common Plan of Development or Sale - means a contiguous area where multiple separate and distinct construction activities are occurring, or will occur, under one plan. The term "plan" in "larger common plan of development or sale" is broadly defined as any announcement or piece of documentation (including a sign, public notice or hearing, marketing plan, advertisement, drawing, permit application, State Environmental Quality Review Act (SEQRA) environmental assessment form or other documents, zoning request, computer design, etc.) or physical demarcation (including boundary signs, lot stakes, surveyor markings, etc.) indicating that construction activities may occur on a specific plot. For discrete construction projects that are located within a larger common plan of development or sale that are at least 1/4 mile apart, each project can be treated as a separate plan of development or sale provided any interconnecting road, pipeline or utility project that is part of the same "common plan" is not concurrently being disturbed. Minimize — means reduce and/or eliminate to the extent achievable using control measures (including best management practices) that are technologically available and economically practicable and achievable in light of best industry practices. Municipal Separate Storm Sewer (MS4) - a conveyance or system of conveyances (including roads with drainage systems, municipal streets, catch basins, curbs, gutters, 38 ditches, man-made channels, or storm drains): (i) Owned or operated by a State, city, town, borough, county, parish, district, association, or other public body (created by or pursuant to State law) having jurisdiction over disposal of sewage, industrial wastes, stormwater, or other wastes, including special districts under State law such as a sewer district, flood control district or drainage district, or similar entity, or an Indian tribe or an authorized Indian tribal organization, or a designated and approved management agency under section 208 of the CWA that discharges to surface waters of the State,- (i i) tate;(ii) Designed or used for collecting or conveying stormwater; (iii) Which is not a combined sewer, and (iv) Which is not part of a Publicly Owned Treatment Works (POTW) as defined at 40 CFR 122.2. National Pollutant Discharge Elimination System (NPDES) - means the national system for the issuance of wastewater and stormwater permits under the Federal Water Pollution Control Act (Clean Water Act). New Development— means any land disturbance that does not meet the definition of Redevelopment Activity included in this appendix. NOI Acknowledgment Letter - means the letter that the Department sends to an owner or operator to acknowledge the Department's receipt and acceptance of a complete Notice of Intent. This letter documents the owner's or operator's authorization to discharge in accordance with the general permit for stormwater discharges from construction activity. Owner or Operator - means the person, persons or legal entity which owns or leases the property on which the construction activity is occurring; and/or an entity that has operational control over the construction plans and specifications, including the ability to make modifications to the plans and specifications. Performance Criteria — means the design criteria listed under the "Required Elements" sections in Chapters 5, 6 and 10 of the technical standard, New York State Stormwater Management Design Manual, dated January 2015. It does not include the Sizing Criteria (i.e. WQv, RRv, Cpv, Qp and Qf ) in Part I.C.2. of the permit. Pollutant - means dredged spoil, filter backwash, solid waste, incinerator residue, sewage, garbage, sewage sludge, munitions, chemical wastes, biological materials, radioactive materials, heat, wrecked or discarded equipment, rock, sand and industrial, municipal, agricultural waste and ballast discharged into water; which may cause or might reasonably be expected to cause pollution of the waters of the state in contravention of the standards or guidance values adopted as provided in 6 NYCRR Parts 700 et seq . 39 Qualified Inspector - means a person that is knowledgeable in the principles and practices of erosion and sediment control, such as a licensed Professional Engineer, Certified Professional in Erosion and Sediment Control (CPESC), Registered Landscape Architect, or other Department endorsed individual(s). It can also mean someone working under the direct supervision of, and at the same company as, the licensed Professional Engineer or Registered Landscape Architect, provided that person has training in the principles and practices of erosion and sediment control. Training in the principles and practices of erosion and sediment control means that the individual working under the direct supervision of the licensed Professional Engineer or Registered Landscape Architect has received four (4) hours of Department endorsed training in proper erosion and sediment control principles from a Soil and Water Conservation District, or other Department endorsed entity. After receiving the initial training, the individual working under the direct supervision of the licensed Professional Engineer or Registered Landscape Architect shall receive four (4) hours of training every three (3) years. It can also mean a person that meets the Qualified Professional qualifications in addition to the Qualified Inspector qualifications. Note: Inspections of any post-construction stormwater management practices that include structural components, such as a dam for an impoundment, shall be performed by a licensed Professional Engineer. Qualified Professional - means a person that is knowledgeable in the principles and practices of stormwater management and treatment, such as a licensed Professional Engineer, Registered Landscape Architect or other Department endorsed individual(s). Individuals preparing SWPPPs that require the post-construction stormwater management practice component must have an understanding of the principles of hydrology, water quality management practice design, water quantity control design, and, in many cases, the principles of hydraulics. All components of the SWPPP that involve the practice of engineering, as defined by the NYS Education Law (see Article 145), shall be prepared by, or under the direct supervision of, a professional engineer licensed to practice in the State of New York.. Redevelopment Activity(ies) — means the disturbance and reconstruction of existing impervious area, including impervious areas that were removed from a project site within five (5) years of preliminary project plan submission to the local government (i.e. site plan, subdivision, etc.). Regulated, Traditional Land Use Control MS4 - means a city, town or village with land use control authority that is required to gain coverage under New York State DEC's SPDES General Permit For Stormwater Discharges from Municipal Separate Stormwater Sewer Systems (MS4s). 40 Routine Maintenance Activity - means construction activity that is performed to maintain the original line and grade, hydraulic capacity, or original purpose of a facility, including, but not limited to- - Re-grading of gravel roads or parking lots, - Stream bank restoration projects (does not include the placement of spoil material), - Cleaning and shaping of existing roadside ditches and culverts that maintains the approximate original line and grade, and hydraulic capacity of the ditch, - Cleaning and shaping of existing roadside ditches that does not maintain the approximate original grade, hydraulic capacity and purpose of the ditch if the changes to the line and grade, hydraulic capacity or purpose of the ditch are installed to improve water quality and quantity controls (e.g. installing grass lined ditch), - Placement of aggregate shoulder backing that makes the transition between the road shoulder and the ditch or embankment, - Full depth milling and filling of existing asphalt pavements, replacement of concrete pavement slabs, and similar work that does not expose soil or disturb the bottom six (6) inches of subbase material, - Long-term use of equipment storage areas at or near highway maintenance facilities, - Removal of sediment from the edge of the highway to restore a previously existing sheet-flow drainage connection from the highway surface to the highway ditch or embankment, - Existing use of Canal Corp owned upland disposal sites for the canal, and - Replacement of curbs, gutters, sidewalks and guide rail posts. Site limitations — means site conditions that prevent the use of an infiltration technique and or infiltration of the total WQv. Typical site limitations include: seasonal high groundwater, shallow depth to bedrock, and soils with an infiltration rate less than 0.5 inches/hour. The existence of site limitations shall be confirmed and documented using actual field testing (i.e. test pits, soil borings, and infiltration test) or using information from the most current United States Department of Agriculture (USDA) Soil Survey for the County where the project is located. Sizing Criteria — means the criteria included in Part I.C.2 of the permit that are used to size post-construction stormwater management control practices. The criteria include; Water Quality Volume (WQv), Runoff Reduction Volume (RRv), Channel Protection Volume (Cpv), Overbank Flood (Qp), and Extreme Flood (Qf). State Pollutant Discharge Elimination System (SPDES) - means the system established pursuant to Article 17 of the ECL and 6 NYCRR Part 750 for issuance of permits authorizing discharges to the waters of the state. Steep Slope — means land area with a Soil Slope Phase that is identified as an E or F, or 41 the map unit name is inclusive of 25% or greater slope, on the United States Department of Agriculture ("USDA") Soil Survey for the County where the disturbance will occur. Surface Waters of the State - shall be construed to include lakes, bays, sounds, ponds, impounding reservoirs, springs, rivers, streams, creeks, estuaries, marshes, inlets, canals, the Atlantic ocean within the territorial seas of the state of New York and all other bodies of surface water, natural or artificial, inland or coastal, fresh or salt, public or private (except those private waters that do not combine or effect a junction with natural surface waters), which are wholly or partially within or bordering the state or within its jurisdiction. Waters of the state are further defined in 6 NYCRR Parts 800 to 941. Temporarily Ceased — means that an existing disturbed area will not be disturbed again within 14 calendar days of the previous soil disturbance. Temporary Stabilization - means that exposed soil has been covered with material(s) as set forth in the technical standard, New York Standards and Specifications for Erosion and Sediment Control, to prevent the exposed soil from eroding. The materials can include, but are not limited to, mulch, seed and mulch, and erosion control mats (e.g. jute twisted yarn, excelsior wood fiber mats). Total Maximum Daily Loads (TMDLs) -A TMDL is the sum of the allowable loads of a single pollutant from all contributing point and nonpoint sources. It is a calculation of the maximum amount of a pollutant that a waterbody can receive on a daily basis and still meet water quality standards, and an allocation of that amount to the pollutant's sources. A TMDL stipulates wasteload allocations (WLAs) for point source discharges, load allocations (LAs) for nonpoint sources, and a margin of safety (MOS). Trained Contractor - means an employee from the contracting (construction) company, identified in Part III.A.6., that has received four (4) hours of Department endorsed training in proper erosion and sediment control principles from a Soil and Water Conservation District, or other Department endorsed entity. After receiving the initial training, the trained contractor shall receive four (4) hours of training every three (3) years. It can also mean an employee from the contracting (construction) company, identified in Part I I I.A.6., that meets the qualified inspector qualifications (e.g. licensed Professional Engineer, Certified Professional in Erosion and Sediment Control (CPESC), Registered Landscape Architect, or someone working under the direct supervision of, and at the same company as, the licensed Professional Engineer or Registered Landscape Architect, provided they have received four (4) hours of Department endorsed training in proper erosion and sediment control principles from a Soil and Water Conservation District, or other Department endorsed entity). The trained contractor is responsible for the day to day implementation of the SWPPP. Uniform Procedures Act (UPA) Permit - means a permit required under 6 NYCRR Part 42 621 of the Environmental Conservation Law (ECL), Article 70. Water Quality Standard - means such measures of purity or quality for any waters in relation to their reasonable and necessary use as promulgated in 6 NYCRR Part 700 et seq. 43 APPENDIX B Required SWPPP Components by Project Type Table 1 CONSTRUCTION ACTIVITIES THAT REQUIRE THE PREPARATION OF A SWPPP THAT ONLY INCLUDES EROSION AND SEDIMENT CONTROLS The following construction activities that involve soil disturbances of one (1) or more acres of land, but less than five (5) acres: • Single family home not located in one of the watersheds listed in Appendix C or not directly discharging to one of the 303(d)segments listed in Appendix E • Single family residential subdivisions with 25% or less impervious cover at total site build-out and not located in one of the watersheds listed in Appendix C and not directly discharging to one of the 303(d)segments listed in Appendix E • Construction of a barn or other agricultural building, silo, stock yard or pen. The following construction activities that involve soil disturbances of one (1) or more acres of land: • Installation of underground, linear utilities; such as gas lines, fiber-optic cable, cable TV, electric, telephone, sewer mains, and water mains • Environmental enhancement projects, such as wetland mitigation projects, stormwater retrofits and stream restoration projects • Bike paths and trails • Sidewalk construction projects that are not part of a road/highway construction or reconstruction project • Slope stabilization projects • Slope flattening that changes the grade of the site, but does not significantly change the runoff characteristics • Spoil areas that will be covered with vegetation • Land clearing and grading for the purposes of creating vegetated open space (i.e. recreational parks, lawns, meadows, fields), excluding projects that alter hydrology from pre to post development conditions • Athletic fields (natural grass)that do not include the construction or reconstruction of impervious area and do not alter hydrology from pre to post development conditions • Demolition project where vegetation will be established and no redevelopment is planned • Overhead electric transmission line project that does not include the construction of permanent access roads or parking areas surfaced with impervious cover • Structural practices as identified in Table II in the "Agricultural Management Practices Catalog for Nonpoint Source Pollution in New York State", excluding projects that involve soil disturbances of less than five acres and construction activities that include the construction or reconstruction of impervious area The following construction activities that involve soil disturbances between five thousand (5000) square feet and one (1)acre of land: • All construction activities located in the watersheds identified in Appendix D that involve soil disturbances between five thousand (5,000)square feet and one (1) acre of land. 44 Table 2 CONSTRUCTION ACTIVITIES THAT REQUIRE THE PREPARATION OF A SWPPP THAT INCLUDES POST-CONSTRUCTION STORMWATER MANAGEMENT PRACTICES The following construction activities that involve soil disturbances of one (1) or more acres of land: • Single family home located in one of the watersheds listed in Appendix C or directly discharging to one of the 303(d)segments listed in Appendix E • Single family residential subdivisions located in one of the watersheds listed in Appendix C or directly discharging to one of the 303(d)segments listed in Appendix E • Single family residential subdivisions that involve soil disturbances of between one (1) and five (5) acres of land with greater than 25% impervious cover at total site build-out • Single family residential subdivisions that involve soil disturbances of five (5)or more acres of land, and single family residential subdivisions that involve soil disturbances of less than five (5)acres that are part of a larger common plan of development or sale that will ultimately disturb five or more acres of land • Multi-family residential developments; includes townhomes, condominiums, senior housing complexes, apartment complexes, and mobile home parks • Airports • Amusement parks • Campgrounds • Cemeteries that include the construction or reconstruction of impervious area (>5%of disturbed area)or alter the hydrology from pre to post development conditions • Commercial developments • Churches and other places of worship • Construction of a barn or other agricultural building(e.g. silo) and structural practices as identified in Table II in the "Agricultural Management Practices Catalog for Nonpoint Source Pollution in New York State"that include the construction or reconstruction of impervious area, excluding projects that involve soil disturbances of less than five acres. • Golf courses • Institutional, includes hospitals, prisons, schools and colleges • Industrial facilities, includes industrial parks • Landfills • Municipal facilities; includes highway garages, transfer stations, office buildings, POTW's and water treatment plants • Office complexes • Sports complexes • Racetracks, includes racetracks with earthen (dirt)surface • Road construction or reconstruction • Parking lot construction or reconstruction • Athletic fields (natural grass)that include the construction or reconstruction of impervious area (>5%of disturbed area)or alter the hydrology from pre to post development conditions • Athletic fields with artificial turf • Permanent access roads, parking areas, substations, compressor stations and well drilling pads, surfaced with impervious cover, and constructed as part of an over-head electric transmission line project , wind-power project, cell tower project, oil or gas well drilling project, sewer or water main project or other linear utility project • All other construction activities that include the construction or reconstruction of impervious area or alter the hydrology from pre to post development conditions, and are not listed in L_-Table 1 45 APPENDIX C Watersheds Where Enhanced Phosphorus Removal Standards Are Required Watersheds where owners or operators of construction activities identified in Table 2 of Appendix B must prepare a SWPPP that includes post-construction stormwater management practices designed in conformance with the Enhanced Phosphorus Removal Standards included in the technical standard, New York State Stormwater Management Design Manual ("Design Manual"). • Entire New York City Watershed located east of the Hudson River - Figure 1 • Onondaga Lake Watershed - Figure 2 • Greenwood Lake Watershed -Figure 3 • Oscawana Lake Watershed — Figure 4 • Kinderhook Lake Watershed — Figure 5 46 Figure 1 - New York City Watershed East of the Hudson EEKMAN EAST R HKVLL PAWLING uPATTERSON KEINT SOUTHEAST PUT AM VALLE CARMELB I I`ER' N RTH SALEM aOMER CCR A WISE R R KTW EDFORD `° N RIDC OLIN K CO s W TLE RTH CAS M U LEASAN HA SON EOH Watershed 47 Figure 2 - Onondaga Lake Watershed CLAY CICERO ISO H S PIAN BUREN CILIA M N U INV EAST BE P-1 AISaUS O C SA. U ELBRI DG DEWITT IA ELLUiS IRAN ,STEL S O ON AGA LAFA "E E INS OTI$OO PAFF TULLY ,,,,,,,, .... Ph sphorus 'U"10"ate REBLE 48 Figure 3 - Greenwood Lake Watershed .............................................................................................................................. WARWICK -------------------------------------------------------- GREENWOOD LAKE Phosphorus Watershed 49 Figure 4 - Oscawana Lake Watershed PHIL IPSTOI j KEIT IPUTNAM VALLEY OSCAWANA LAKE CARMEL Phosphorus Waterslhed j 50 Figuar'e 5: I inn rh ook Lake Watershed ed SAND LAKE EAST GREENBUSH " NASSAU SIr�H HOICY,�4,I�:K " II NEW LEBANON KIIINIDERHOOK CHATHAM r ANIN I Tawwm,Village,or City H3oun, ary for New York State 0 q 2 4 Mulles, Kilnderlhiook Lake;Watershed 51 APPENDIX D Watersheds where owners or operators of construction activities that involve soil disturbances between five thousand (5000) square feet and one (1) acre of land must obtain coverage under this permit. Entire New York City Watershed that is located east of the Hudson River - See Figure 1 in Appendix C 52 APPENDIX E List of 303(d) segments impaired by pollutants related to construction activity(e.g. silt, sediment or nutrients). Owners or operators of single family home and single family residential subdivisions with 25% or less total impervious cover at total site build-out that involve soil disturbances of one or more acres of land, but less than 5 acres, and directly discharge to one of the listed segments below shall prepare a SWPPP that includes post-construction stormwater management practices designed in conformance with the New York State Stormwater Management Design Manual ("Design Manual"), dated January 2015. COUNTY WATERBODY COUNTY WATERBODY Albany Ann Lee (Shakers)Pond, Stump Pond Greene Sleepy Hollow Lake Albany Basic Creek Reservoir Herkimer Steele Creek tribs Allegheny Amity Lake, Saunders Pond Kings Hendrix Creek Bronx Van Cortlandt Lake Lewis Mill Creek/South Branch and tribs Broome Whitney Point Lake/Reservoir Livingston Conesus Lake Broome Fly Pond, Deer Lake Livingston Jaycox Creek and tribs Broome Minor Tribs to Lower Susquehanna Livingston Mill Creek and minor tribs (north) Livingston Bradner Creek and tribs Cattaraugus Allegheny River/Reservoir Livingston Christie Creek and tribs Cattaraugus Case Lake Monroe Lake Ontario Shoreline,Western Cattaraugus Linlyco/Club Pond Monroe Mill Creek/Blue Pond Outlet and tribs Cayuga Duck Lake Monroe Rochester Embayment-East Chautauqua Chautauqua Lake, North Monroe Rochester Embayment-West Chautauqua Chautauqua Lake, South Monroe Unnamed Trib to Honeoye Creek Chautauqua Bear Lake Monroe Genesee River, Lower, Main Stem Chautauqua Chadakoin River and tribs Monroe Genesee River, Middle, Main Stem Chautauqua Lower Cassadaga Lake Monroe Black Creek, Lower, and minor tribs Chautauqua Middle Cassadaga Lake Monroe Buck Pond Chautauqua Findley Lake Monroe Long Pond Clinton Great Chazy River, Lower, Main Stem Monroe Cranberry Pond Columbia Kinderhook Lake Monroe Mill Creek and tribs Columbia Robinson Pond Monroe Shipbuilders Creek and tribs Dutchess Hillside Lake Monroe Minor tribs to Irondequoit Bay Dutchess Wappinger Lakes Monroe Thomas Creek/White Brook and tribs Dutchess Fall Kill and tribs Nassau Glen Cove Creek, Lower, and tribs Erie Green Lake Nassau LI Tribs (fresh)to East Bay Erie Scajaquada Creek, Lower, and tribs Nassau East Meadow Brook, Upper, and tribs Erie Scajaquada Creek, Middle, and tribs Nassau Hempstead Bay Erie Scajaquada Creek, Upper, and tribs Nassau Hempstead Lake Erie Rush Creek and tribs Nassau Grant Park Pond Erie Ellicott Creek, Lower, and tribs Nassau Beaver Lake Erie Beeman Creek and tribs Nassau Camaans Pond Erie Murder Creek, Lower, and tribs Nassau Halls Pond Erie South Branch Smoke Cr, Lower, and Nassau LI Tidal Tribs to Hempstead Bay tribs Nassau Massapequa Creek and tribs Erie Little Sister Creek, Lower, and tribs Nassau Reynolds Channel, east Essex Lake George (primary county: Warren) Nassau Reynolds Channel,west Genesee Black Creek, Upper, and minor tribs Nassau Silver Lake, Lofts Pond Genesee Tonawanda Creek, Middle, Main Stem Nassau Woodmere Channel Genesee Oak Orchard Creek, Upper, and tribs Niagara Hyde Park Lake Genesee Bowen Brook and tribs Niagara Lake Ontario Shoreline,Western Genesee Bigelow Creek and tribs Niagara Bergholtz Creek and tribs Genesee Black Creek, Middle, and minor tribs Oneida Ballou, Nail Creeks Genesee LeRoy Reservoir Onondaga Ley Creek and tribs Greene Schoharie Reservoir Onondaga Onondaga Creek, Lower and tribs 53 APPENDIX E List of 303(d) segments impaired by pollutants related to construction activity, cont'd. COUNTY WATERBODY COUNTY WATERBODY Onondaga Onondaga Creek, Middle and tribs Suffolk Great South Bay,West Onondaga Onondaga Creek, Upp, and minor tribs Suffolk Mill and Seven Ponds Onondaga Harbor Brook, Lower, and tribs Suffolk Moriches Bay, East Onondaga Ninemile Creek, Lower, and tribs Suffolk Moriches Bay,West Onondaga Minor tribs to Onondaga Lake Suffolk Quantuck Bay Onondaga Onondaga Creek, Lower, and tribs Suffolk Shinnecock Bay(and Inlet) Ontario Honeoye Lake Sullivan Bodine, Montgomery Lakes Ontario Hemlock Lake Outlet and minor tribs Sullivan Davies Lake Ontario Great Brook and minor tribs Sullivan Pleasure Lake Orange Monhagen Brook and tribs Sullivan Swan Lake Orange Orange Lake Tompkins Cayuga Lake, Southern End Orleans Lake Ontario Shoreline,Western Tompkins Owasco Inlet, Upper, and tribs Oswego Pleasant Lake Ulster Ashokan Reservoir Oswego Lake Neatahwanta Ulster Esopus Creek, Upper, and minor Putnam Oscawana Lake tribs Putnam Palmer Lake Ulster Esopus Creek, Lower, Main Stem Putnam Lake Carmel Ulster Esopus Creek, Middle, and minor Queens Jamaica Bay, Eastern, and tribs(Queens) tribs Queens Bergen Basin Warren Lake George Queens Shellbank Basin Warren Tribs to L.George,Village of L Rensselaer Nassau Lake George Rensselaer Snyders Lake Warren Huddle/Finkle Brooks and tribs Richmond Grasmere,Arbutus and Wolfes Lakes Warren Indian Brook and tribs Rockland Congers Lake, Swartout Lake Warren Hague Brook and tribs Rockland Rockland Lake Washington Tribs to L.George, East Shr Lk Saratoga Ballston Lake George Saratoga Round Lake Washington Cossayuna Lake Saratoga Dwaas Kill and tribs Washington Wood Cr/Champlain Canal, minor Saratoga Tribs to Lake Lonely tribs Saratoga Lake Lonely Wayne Port Bay Schenectady Collins Lake Wayne Marbletown Creek and tribs Schenectady Duane Lake Westchester Lake Katonah Schenectady Mariaville Lake Westchester Lake Mohegan Schoharie Engleville Pond Westchester Lake Shenorock Schoharie Summit Lake Westchester Reservoir No.1 (Lake Isle) Schuyler Cayuta Lake Westchester Saw Mill River, Middle, and tribs St. Lawrence Fish Creek and minor tribs Westchester Silver Lake St. Lawrence Black Lake Outlet/Black Lake Westchester Teatown Lake Steuben Lake Salubria Westchester Truesdale Lake Steuben Smith Pond Westchester Wallace Pond Suffolk Millers Pond Westchester Peach Lake Suffolk Mattituck(Marratooka)Pond Westchester Mamaroneck River, Lower Suffolk Tidal tribs to West Moriches Bay Westchester Mamaroneck River, Upp, and tribs Suffolk Canaan Lake Westchester Sheldrake River and tribs Suffolk Lake Ronkonkoma Westchester Blind Brook, Lower Suffolk Beaverdam Creek and tribs Westchester Blind Brook, Upper, and tribs Suffolk Big/Little Fresh Ponds Westchester Lake Lincolndale Suffolk Fresh Pond Westchester Lake Meahaugh Suffolk Great South Bay, East Wyoming Java Lake Suffolk Great South Bay, Middle Wyoming Silver Lake Note: The list above identifies those waters from the final New York State "2014 Section 303(d) List of Impaired Waters Requiring a TMDL/Other Strategy", dated January 2015, that are impaired by silt, sediment or nutrients. 54 APPENDIX F LIST OF NYS DEC REGIONAL OFFICES Region COVERING THE DIVISION OF DIVISION OF WATER FOLLOWING ENVIRONMENTAL (DOW) COUNTIES: PERMITS (DEP) PERMIT ADMINISTRATORS WATER (SPDES) PROGRAM 1 NASSAU AND SUFFOLK 50 CIRCLE ROAD 50 CIRCLE ROAD STONY BROOK,NY 11790 STONY BROOK,NY 11790-3409 TEL.(631)444-0365 TEL.(631)444-0405 2 BRONX,KINGS,NEW YORK, 1 HUNTERS POINT PLAZA, 1 HUNTERS POINT PLAZA, QUEENS AND RICHMOND 47-4021 ST ST. 47-4021 ST ST. LONG ISLAND CITY,NY 11101-5407 LONG ISLAND CITY,NY 11101-5407 TEL.(718)482-4997 TEL.(718)482-4933 3 DUTCHESS,ORANGE,PUTNAM, 21 SOUTH PUTT CORNERS ROAD 100 HILLSIDE AVENUE,SUITE 1W ROCKLAND,SULLIVAN,ULSTER NEW PALTZ,NY 12561-1696 WHITE PLAINS,NY 10603 AND WESTCHESTER TEL.(845)256-3059 TEL.(914)428-2505 4 ALBANY,COLUMBIA, 1150 NORTH WESTCOTT ROAD 1130 NORTH WESTCOTT ROAD DELAWARE,GREENE, SCHENECTADY,NY 12306-2014 SCHENECTADY,NY 12306-2014 MONTGOMERY,OTSEGO, TEL.(518)357-2069 TEL.(518)357-2045 RENSSELAER,SCHENECTADY AND SCHOHARIE 5 CLINTON,ESSEX,FRANKLIN, 1115 STATE ROUTE 86, PO BOX 296 232 GOLF COURSE ROAD FULTON,HAMILTON, RAY BROOK,NY 12977-0296 WARRENSBURG,NY 12885-1172 SARATOGA,WARREN AND TEL.(518)897-1234 TEL.(518)623-1200 WASHINGTON 6 HERKIMER,JEFFERSON, STATE OFFICE BUILDING STATE OFFICE BUILDING LEWIS,ONEIDA AND 317 WASHINGTON STREET 207 GENESEE STREET ST. LAWRENCE WATERTOWN,NY 13601-3787 UTICA, NY 13501-2885 TEL. 315 785-2245 TEL. 315 793-2554 7 BROOME,CAYUGA, 615 ERIE BLVD.WEST 615 ERIE BLVD.WEST CHENANGO,CORTLAND, SYRACUSE, NY 13204-2400 SYRACUSE, NY 13204-2400 MADISON,ONONDAGA, TEL.(315)426-7438 TEL.(315)426-7500 OSWEGO,TIOGA AND TOMPKINS 8 CHEMUNG,GENESEE, 6274 EAST AVON-LIMA ROAD 6274 EAST AVON-LIMA RD. LIVINGSTON,MONROE, AVON, NY 14414-9519 AVON, NY 14414-9519 ONTARIO,ORLEANS, TEL.(585)226-2466 TEL.(585)226-2466 SCHUYLER,SENECA, STEUBEN,WAYNE AND YATES 9 ALLEGANY, 270 MICHIGAN AVENUE 270 MICHIGAN AVE. CATTARAUGUS, BUFFALO, NY 14203-2999 BUFFALO, NY 14203-2999 CHAUTAUQUA, ERIE, TEL.(716)851-7165 TEL.(716)851-7070 NIAGARA AND WYOMING 55 Construction Stormwater Inspection Manual Aft NEW YORK STATE DEPARTMENT OF - ENVIRONMENTAL CONSERVATION Construction Stormwater Inspection Manual Primarily for Government Inspectors Evaluating Compliance with Construction Stormwater Control Requirements New York State Department of Environmental Conservation TABLE OF CONTENTS Version 1.05 (8/27/07) Section Content Page 1.0 INTRODUCTION AND PURPOSE 1 1.1 Compliance Inspections 1 1.2 Self-inspections 2 2.0 PRE-INSPECTION ACTIVITIES 3 2.1 Regulatory Oversight Authorities 3 2.2 Permittee's Self-inspector 5 3.0 ON-SITE INSPECTION ACTIVITIES 5 3.1 Compliance Inspections 5 3.2 Non-permitted Site Inspections 9 3.3 Self-inspections 9 4.0 POST-INSPECTION ACTIVITIES 10 4.1 Regulatory Oversight Authorities 10 4.2 Permittee's Self-inspections 11 ATTACHMENTS Attachment 1 - Compliance Inspection Form 12 Attachment 2 -Unpermitted Site Notice 14 Attachment 3 - Example Inspection Letter 15 -i- 1.0 INTRODUCTION AND PURPOSE The New York State Department of Environmental Conservation Division of Water(DOW) considers there to be two types of inspections germane to construction stormwater; compliance inspections and self-inspections. This manual is for use by DOW and other regulatory oversight construction stormwater inspectors in performing compliance inspections, as well as for site operators in performing self inspections. The manual should be used in conjunction with the New York State Standards and Specifications for Erosion and Sediment Control, August 2005. 1.1 Compliance Inspections Regulatory compliance inspections are performed by regulatory oversight authorities such as DOW staff, or representatives of DOW and local municipal construction stormwater inspectors. These inspections are intended to determine compliance with the state or local requirements for control of construction stormwater through erosion and sediment control and post construction practices. Compliance inspections focus on determinations of compliance with legal and water quality standards. Typically, compliance inspections can be further sub-categorized to include comprehensive inspections, and follow-up or reconnaissance inspections. Compliance inspectors will focus on determining whether: • the project is causing water quality standard violations; • the required Stormwater Pollution Prevention Plan (SWPPP)includes appropriate erosion and sediment controls and, to some extent,post construction controls; • the owner/operator is complying with the SWPPP; • where required, self-inspections are being properly performed; and • where self-inspections are required, the owner/operator responds appropriately to the self-inspector's reports. 1.1.1 Comprehensive Inspection Comprehensive inspections are designed to verify permittee compliance with all applicable regulatory requirements, effluent controls, and compliance schedules. This inspection involves records reviews, visual observations, and evaluations of management practices, effluents, and receiving waters. Comprehensive inspections should be conducted according to a neutral or random inspection scheme, or in accordance with established priorities. A neutral monitoring scheme provides some objective basis for scheduling inspections and sampling visits by establishing a system (whether complex factor-based, alphabetic, or geographic) for setting prioritiesto ensure that a particular facility is not unfairly selected for inspection or sampling. The selection of which 1 facility to inspect must be made without bias to ensure that the regulatory oversight authority, if challenged for being arbitrary and capricious manner, can reasonably defend itself. A neutral inspection scheme should set the criteria the inspector uses to choose which facilities to inspect, but the schedule for the actual inspection should remain confidential, and may be kept separate from the neutral plan. A routine comprehensive compliance inspection is most effective when it is unannounced or conducted with very little advance warning. 1.1.2 Reconnaissance Inspection A reconnaissance inspection is performed in lieu of, or following a comprehensive inspection to obtain a preliminary overview of an owner/operator's compliance program, to respond to a citizen complaint, or to assess a non-permitted site. The inspector performs a brief(generally about an hour) visual inspection of the site, discharges and receiving waters. A reconnaissance inspection uses the inspector's experience and judgement to summarize potential compliance problems, without conducting a full comprehensive inspection. The objective of a reconnaissance inspection is to expand inspection coverage without increasing inspection resource expenditures. The reconnaissance inspection is the shortest and least resource intensive of all inspections. Reconnaissance inspections may be initiated in response to known or suspected violations, a public complaint, a violation of regulatory requirements, or as follow-up to verify that necessary actions were taken in response to a previous inspection. 1.2 Self-inspections For some projects, the site owner/operator is required by their State Pollutant Discharge Elimination System (SPDES)Permit and/or local requirements to have a qualified professional perform a"self-inspection" at the site. In self-inspections, the qualified professional determines whether the site is being managed in accordance with the SWPPP, and whether the SWPPP's recommended erosion and sediment controls are effective. If activities are not in accordance with the SWPPP, or if the SWPPP erosion and sediment controls are not effective, the qualified professional inspecting the site recommends corrections to the owner/operator. A "Qualified professional"is a person knowledgeable in the principles and practice of erosion and sediment controls, such as a licensed professional engineer, Certified Professional in Erosion and Sediment Control (CPESC), licensed landscape architect or soil scientist. 2 2.0 PRE-INSPECTION ACTIVITIES 2.1 Regulatory Oversight Authorities This section is intended for inspectors with regulatory oversight authority such as agents of the DOW or a local municipality, or others acting on their behalf, such as county Soil and Water Conservation District staff. Examples of other regulatory oversight authorities include: the United States Environmental Protection Agency (EPA); New York City Department of Environmental Protection (DEP), Adirondack Park Agency (APA); the Lake George Park Commission (LGPC), and the Skaneateles Lake Watershed Authority (SLWA). Before arriving on-site to conduct the inspection, considerations concerning communication, documentation and equipment must be made. Regulatory oversight authority is granted by state or local law to government agencies or, depending upon the particular law, an authorized representative of state or local government. SPDES rules 6 NYCRR 750-2.3 and Environmental Conservation Law 17-0303(6) and 17- 0829(a) all allow for authorized representatives of the(NYSDEC) commissioner to perform all the duties of an inspector. 2.1.1 Communication Coordination with Other Entities Where appropriate,prior to selecting sites for inspection, compliance inspectors should communicate with other regulatory oversight authorities to avoid unnecessary duplication or to coordinate follow-up to inspections performed by other regulatory oversight authorities. Announced vs. Unannounced Inspection Inspections may be announced or unannounced. Each method has its own advantages and disadvantages. Unannounced inspections are preferred, however many job sites are not continuously manned, or not always staffed by someone who is familiar with the SWPPP, thus necessitating an announced inspection. As an alternative, when an announced inspection is necessary, inspectors should try to give as little advanced warning as possible (24 hours is suggested). Itinerary For obvious safety reasons, inspectors should be sure to inform someone in their office which site or sites they will be visiting prior to leaving the to perform inspections. 2.1.2 Documentation Data Review The inspector should review any available information such as: • Notice of Intent • Stormwater Pollution Prevention Plan • Past inspection records • Phasing plan 3 • Construction sequence • Inspection and Maintenance schedules • Site specific issues • Consent Orders • Access agreements Inspection Form The inspector should have copies of, and be familiar with, the inspection form used by their regulatory oversight authority (example in Attachment 1)before leaving the office. Static information such as name, location and permit number can be entered onto the inspection form prior to arriving at the inspection site. Credentials Inspectors should always carry proper identification to prove that they are employed by an entity with jurisdictional authority. Failure to display proper credentials may be legal grounds for denial of entry to a site. 2.1.3 Equipment Personal Protective Equipment DOW employees must conform to the DOW Health and Safety policy as it relates to personal protective equipment. Other regulatory oversight authorities should have their own safety policies or, if not, may wish to consult the OSHA health and safety tool at: www.osha. og v/dep/etools/ehasp to develop a health and safety plan. The following is a list of some of the most common health and safety gear that may be needed: • Hard hat(Class G, Typel or better) • Safety toe shoes • Reflective vest • Hearing protection (to achieve 85 dBA - 8 hr TWA) • Safety glasses with side shields If the construction is on an industrial site or a hazardous waste site, special training may be required prior to entering the site. The inspector should consult with OSHA or NYSDEC prior to entering such a site. Monitoring Equipment The following is a list of some equipment that may be helpful to document facts and verify compliance: • Digital Camera • Measuring tape or wheel • Hand level or clinometer • Turbidity meter(in limited circumstances) 4 2.2 Permittee's Self-inspection This section is intended for qualified professionals who conduct site self-inspections on behalf of owner/operators. Self-inspectors are responsible for performing inspections in accordance with permit requirements and reporting to site owners and operators the results and any recommendations resulting from the inspection. Prior to conducting inspections, qualified professionals should ensure familiarity with the Stormwater Pollution Prevention Plan and previous inspection reports. 3.0 ON-SITE INSPECTION PROCESS 3.1 Compliance Inspections 3.1.1 Professionalism Don't Pretend to Possess Knowledge Unless the inspector has experience with a particular management practice, do not pretend to possess knowledge. Inspectors cannot be expert in all areas; their job is to collect information, not to demonstrate superior wisdom. Site operators are often willing to talk to someone who is inquisitive and interested. Within reason, asking questions to obtain new information about a management practice, construction technique or piece of equipment is one of the inspector's main roles in an inspection. Don't Recommend Solutions The inspector should not recommend solutions or endorse products. The solution to a compliance problem may appear obvious based on the inspector's experience. However, the responsibility should be placed on the site owner to implement a workable solution to a compliance problem that meets NYSDEC standards. The inspector should refer the site operator to the New York Standards and Specifications for Erosion and Sediment Control (the Blue Book) or the New York State Stormwater Management Design Manual (the Design Manual). Key advice must be offered carefully. One experienced stormwater inspector suggests saying: "I can't direct you or make recommendations, but what we've seen work in other situations is ..." The way inspectors present themselves is important to the effectiveness of the inspection. An inspector cannot be overly familiar, but will be more effective if able to establish a minimum level of communication. 3.1.2 Safety DOW employees must conform to Division health and safety policies when on a construction site. Other regulatory oversight authorities should have their own safety policies or, if not, may 5 wish to consult the OSHA health and safety tool at: www.osha._og v/dep/etools/ehasp to develop a health and safety plan. Some general protections for construction sites are: • Beware of heavy equipment, avoid operator blind spots and make sure of operator eye contact around heavy equipment. • Avoid walking on rock rip-rap if possible. Loose rock presents a slip hazard. • Stay out of confined spaces like tanks, trenches and foundation holes. • Avoid lightning danger. Monitor weather conditions, get out of water, avoid open areas and high points, do not huddle in groups or near trees. • Protect yourself from sun and heat exposure. Use sun screen or shading clothing. Remain hydrated by drinking water, watching for signs of heat cramps, exhaustion (fatigue, nausea, dizziness, headache, cool or moist skin), or stroke (high body temperature; red, hot and dry skin) • Protect yourself from cold weather. Wear multiple layers of thin clothing. Wear a warm hat. Drink warm fluids or eat hot foods, and keep dry. • Avoid scaffolding in excess of 4 feet above grade. • Beware of ticks, stinging insects, snakes and poison ivy or sumac. 3.1.3 Legal access DOW has general powers, set forth under ECL 17-0303, subparagraph 6, to enter premises for inspections. In addition, ECL 3-0301.2 conveys general statutory authority granting the DOW the power to access private property to fulfill DOW obligations under the law. ECL 15-0305 gives the DOW the authority to enter at all times in or upon any property,public or private, for the purpose of inspecting or investigating conditions affecting the construction of improvements to or developments of water resources for the public health, safety or welfare. ECL 17-0829 allows an authorized DOW representative, upon presentation of their credentials, to enter upon any premises where any effluent source is located, or in which records are required to be maintained. The representative may at reasonable times have access to, and sample discharges/pollutants to the waters or to publicly owned treatment plants where the effluent source is located. This subparagraph provides DOW representatives performing their duties authority to enter a site to pursue administrative violations. Pursuing criminal violations may require a warrant or the owner's permission to enter the site. For sites that are permitted, DOW has authority under the permit to enter the site. If the owner/operator's representatives onsite deny access, the inspector should not physically force entry. Under these circumstances the attorney representing the inspector should be immediately notified and consideration should be given to soliciting the aid of a law officer to obtain entry. 6 DOW staff have the right to enter at any reasonable time. If no one is available, and the site is fenced or posted, DOW staff should make all reasonable efforts to identify, contact and notify the owner that the DOW is entering the site. If the inspector has made all reasonable efforts to contact site owners, but was unable to do so, the site can then be accessed. All efforts should be taken not to cause any damage to the facility. Other regulatory oversight authorities should seek advice on their legal authorities to enter a job site. Municipalities that have adopted Article 6 of the New York State Sample Local Law for Stormwater Management and Erosion and Sediment Control (NYSDEC, 2004, updated 2006) will have legal authority to enter sites in accordance with that chapter and any other existing municipal authority . Agents of DOW have authority similar DOW staff authority to enter sites. However, DOW staff enjoy significant personal liability protections as state employees. That liability protection may not be the same for authorized representatives of DOW. For authorized representatives of DOW (or other regulatory oversight authorities), it is prudent to obtain permission to enter the site. If such permission is denied, the authorized representatives should inform the appropriate DOW contact, usually the regional water manager. 3.1.4 Find the Legally Responsible Party (Construction Manager, Self-inspector) The first action a compliance inspector should take upon entering a construction site is to find the construction trailer or the construction or project manager if they are available. The inspector should present appropriate identification to the site's responsible party and state the reason for the inspection; construction stormwater complaint response or neutral construction stormwater inspection. If the inspection is initiated as a response to a complaint, frequently the responsible party will ask who made the complaint. DOW keeps private individual complainants confidential. If the complainant is another regulatory oversight authority, DOW tends to make that known to the site's responsible party. 3.1.5 On-site records review (NOI, SWPPP, Self-inspection Reports, Permit) Generally, the compliance inspector should next review the on-site records. Verify that a copy of the construction stormwater permit and NOI are on-site. Verify that the acreage, site conditions, and receiving water listed on the NOI are accurate. Compare the on-site documentation with documentation already submitted to, or obtained by the compliance inspector. If the SWPPP has not been reviewed in the office, verify that it exists and contains the minimum required components (16 for a basic plan and 22 for a full plan). On-site review of the SWPPP should determine if: there is an appropriate phasing plan; the acreage disturbed in each phase, construction sequence for each phase; proposed implementation of erosion and sediment control measures; and, where required,post construction controls. For each of the erosion and sediment control practices, the SWPPP must show design details in accordance with the NYS Standards for Erosion and Sediment Controls. The SWPPP must also include provisions for maintenance of practices during construction. On-site review of post construction controls is generally limited to verification that the proposed stormwater management practices are shown on the site plan. 7 Where self-inspections are required, self-inspection reports are a significant tool for the compliance inspector to determine the performance history of the site. The self-inspection reports should be done with the required frequency . Self-inspection reports must include all the details required by the permit. Generally, it is desirable for permit information to be shown on a site plan. The compliance inspector should become familiar with the report and use that familiarity to judge whether the self-inspections are being performed correctly and that the site operator is correcting deficiencies noted in the report. 3.1.6 Walk the Site During wet weather conditions, it may be advantageous to observe the receiving waters prior to walking the rest of the site. At some point during the inspection, the receiving water conditions must be observed and noted. It is critical to note if there is a substantial visible contrast to natural conditions, or evidence of deposition, streambank erosion, construction debris or waste materials (e.g. concrete washdown)in the receiving stream. Each inspector should evaluate actual implementation and maintenance of practices on-site compared to how implementation and maintenance is detailed in the SWPPP. At a minimum, the compliance inspector should observe all areas of active construction. Observing equipment or materials storage, recently stabilized areas, or stockpile areas is also appropriate to evaluate the effectiveness of management practices. 3.1.7 Taking Photographs Evidence of poor receiving water conditions and poor or ineffective practices should be documented with digital photographs. Those photographs should be logged date stamped and stored on media that cannot be edited(e.g. write only CDs). Photos should also be appended to the site inspector's report. It is also beneficial to take photographs of good practices for educational and technology transfer reasons. 3.1.8 Exit Interview Clearly communicate expectations and consequences. If it is clear from the inspection that the owner/operator must modify the SWPPP, or modify management practices within an assigned period(e.g. 24 hours, 48 hours, one week, two weeks), then that finding should be communicated at the time of the exit interview. The inspector should assign the period based on factors such as how long it would reasonably take to complete such modifications and the level of risk to water quality associated with failure to make such modifications. The inspector should make clear that NYSDEC reserves rights to future enforcement actions. If the inspector's supervisor or enforcement coordinator determines additional enforcement actions are necessary, the inspector should not reassure the owner/operator that the current situation is acceptable. 8 3.2 Non-permitted Site Inspections For sites not authorized in accordance with state or local laws, the process will be abbreviated. First verify the need for authorization and observe receiving waters to detect water quality standard violations. If there is a violation, notify the owner of the violation or other compliance actions in response to their illicit activity. For DOW staff, Attachment 2 or a similar notice can be used to notify the site owner/operator that stormwater authorization is required. 3.3 Self-inspections The role of the self-inspector is to verify that the site is complying with stormwater requirements. In particular, the self-inspector verifies that the SWPPP is being properly implemented. The self-inspector also documents SWPPP implementation so regulatory agencies can review implementation activities. It is not the role of the self-inspector to report directly to regulatory authorities. Appendix H of The New York Standards and Specifications for Erosion and Sediment Control - August 2005 (the Blue Book)includes a Construction Duration Inspection checklist that can be used by the owner/operators qualified professional for self-inspections. The Blue Book is available on the NYSDEC website. 3.3.1 Purpose The self inspector should ensure that the project's SWPPP is being properly implemented. This includes ensuring that the erosion and sediment control practices are properly installed and being maintained in accordance with the SWPPP/Blue Book. The project must be properly phased to limit the disturbance to less than five acres, and the construction sequence for each phase must be followed. The SWPPP must also be modified to address evolving circumstances. Finally, and most importantly, receiving waters must be protected. If a soil disturbance will be greater than five acres at any given time, the site operator must obtain written permission from the DOW regional office. 3.3.2 Pre-construction Conference The parties responsible for various aspects of stormwater compliance should be identified at the pre-construction conference. Responsible parties may include, but are not limited to, owner's engineer, owner/operator/permittee, contractors, and subcontractors. Typical responsibilities include: installation of erosion and sediment control (E& SC)practices; maintenance of E& SC practices, inspection of E&SC practices, installation of post construction stormwater management practices (SMPs), inspection of post construction SMPs, SWPPP revisions, and contractor direction. 9 All parties should clearly know what is expected of them. Responsible parties should complete the Pre-construction Site Assessment Checklist provided in Appendix H of the Blue Book. 3.3.3 Inspection Preparation The inspector should review the project's SWPPP (including the phasing plan, construction sequence and site specific issues) and the last few inspection reports (if the inspector has them available). 3.3.4 Self-inspection Components Inspect installation,performance and maintenance of all E&SC practices The self inspector should inspect all areas that are under active construction or disturbance and areas that are vulnerable to erosion. The self-inspector should also inspect areas that will be disturbed prior to the next inspection for measures required prior to construction (e.g. silt barriers, stabilized construction entrance, diversions). Finally, self-inspectors should inspect post-construction controls during and after installation. Identify site deficiencies and corrective measures The self-inspector's reports must be maintained in a log book on site and the log book must be made available to the regulatory authorities. Although the legal responsibility for filing a Notice of Termination lies with the owner/operator, the self-inspector may also be called upon to perform a final site inspection, including post construction SMPs,prior to filing the Notice of Termination. 4.0 POST-INSPECTION ACTIVITIES 4.1 Regulatory Oversight Authorities This section is intended for inspectors with regulatory oversight authority such as agents of the DOW or a local municipality, or others acting on their behalf(such as County Soil and Water Conservation District staff) Upon completion of an inspection, inspection results should be documented for the record. 4.1.1 Written Notification The inspector should inform the permittee or the on-site representative of their inspection results in writing by sending the permittee a complete, signed copy of the inspection report. The inspection report should be transmitted under a cover letter which elaborates on any deficiencies noted in the inspection report. It is not a good idea to commend exceptional efforts by the owner/operator in a letter, because such letters tend to undermine enforcement efforts when compliance status at a site degrades. 10 The inspector should consider providing a copy of the cover letter and inspection report to other parties with including: • Permittee • Contractor(s) • Other regulatory oversight authorities • Other parties present during the inspection (e.g. SWPPP preparer,permittee's self-inspector, etc.) For DOW staff, an example of the inspection cover letter is included as Attachment 3. 4.1.2 Inspection Tracking DOW staff must enter their inspection results into the electronic Water Compliance System. Local municipalities and other regulatory oversight authorities are encouraged to develop an electronic tracking system in which to record their inspections. 4.2 Permittee's Self-inspections This section is intended for qualified professionals who conduct site inspections for permittees in accordance with a SPDES permit or local requirements. 4.2.1 Written Records Inspection Reports The inspector shall prepare a written report summarizing inspection results. The inspection report is then provided to the permittee, or the permittee's duly authorized representative, and to the contractor responsible for implementing stormwater controls on-site in order to correct deficiencies noted in the inspection report. Finally, the inspection report must be added to the site log book that is required to be maintained on-site, and be available to regulatory oversight authorities for review. 4.2.2 Stormwater Pollution Prevention Plan Revisions The inspector must inform the permittee of his/her duty to amend the Stormwater Pollution Prevention Plan (SWPPP)whenever an inspection proves the SWPPP to be ineffective in: • Eliminating or significantly minimizing pollutants from on-site sources • Achieving the general objectives of controlling pollutants in stormwater discharges from permitted construction activity • Eliminating discharges that cause a substantial visible contrast to natural conditions 11 ATTACHMENT I Construction Stormwater Compliance Ins ection Report Project Name and Location: Date: Page 1 of 2 Permit#(if any): NYR Municipality: County: Entry Time: Exit Time: On-site Representative(s)and contact information: Weather Conditions: Name and Address of SPDES Permittee/Title/Phone/Fax Numbers: Contacted: Yes❑ No❑ INSPECTION CHECKLIST SPDES Authority Yes No N/A Law,rule or permit citation 1. ❑ ❑ ❑ Is a copy of the NOI posted at the construction site for public viewing? 2. ❑ ❑ ❑ Is an up-to-date copy of the signed SWPPP retained at the construction site? 3. ❑ ❑ ❑ Is a copy of the SPDES General Permit retained at the construction site? SWPPP Content Yes No N/A Law,rule or permit citation 4. ❑ ❑ ❑ Does the SWPPP describe and identify the erosion&sediment control measures to be employed? 5. ❑ ❑ ❑ Does the SWPPP provide a maintenance schedule for the erosion&sediment control measures? 6. ❑ ❑ ❑ Does the SWPPP describe and identify the post-construction SW control measures to be employed? 7. ❑ ❑ ❑ Does the SWPPP identify the contractor(s)and subcontractor(s)responsible for each measure? 8. ❑ ❑ ❑ Does the SWPPP include all the necessary `CONTRACTOR CERTIFICATION'statements? 9. ❑ ❑ ❑ Is the SWPPP signed/certified by the permittee? Recordkeeping Yes No N/A Law,rule or permit citation 10. ❑ ❑ ❑ Are inspections performed as required by the permit(every 7 days and after 1/2"rain event)? 11. ❑ ❑ ❑ Are the site inspections performed by a qualified professional? 12. ❑ ❑ ❑ Are all required reports properly signed/certified? 13. ❑ ❑ ❑ Does the SWPPP include copies of the monthly/quarterly written summaries of compliance status? Visual Observations Yes No N/A Law,rule or permit citation 14. ❑ ❑ ❑ Are all erosion and sediment control measures installed/constructed? 15. ❑ ❑ ❑ Are all erosion and sediment control measures maintained properly? 16. ❑ ❑ ❑ Have all disturbances of 5 acres or more been approved prior to the disturbance? 17. ❑ ❑ ❑ Are stabilization measures initiated in inactive areas? 18. ❑ ❑ ❑ Are permanent stormwater control measures implemented? 19. ❑ ❑ ❑ Was there a discharge into the receiving water on the day of inspection? 20. ❑ ❑ ❑ Are receiving waters free of there evidence of turbidity,sedimentation,or oil?(If no,complete Page 2) Overall Inspection Rating: ❑ Satisfactory ❑ Marginal ❑Unsatisfactory Name/Agency of Signature of Lead Inspector: Lead Inspector: Names/Agencies of Other Inspectors: 12 Rev. 10-16-06 Page 2 of 2 Water Quality Observations Describe the discharge(s)[source(s),impact on receiving water(s),etc.] Describe the quality of the receiving water(s)both upstream and downstream of the discharge Describe any other water quality standards or permit violations Additional Comments: ❑ Photographs attached 13 ATTACHMENT 2 **** NOTICE **** On March 10, 2003,provisions of the Federal Clean Water Act went into effect that apply to many construction operations. If your construction operations result in the disturbance of one acre or greater and stormwater runoff from your site reaches surface waters (i.e., lake, stream, road side ditch, swale, storm sewer system, etc.), the stormwater runoff from your site must be covered by a State Pollutant Discharge Elimination System (SPDES) Permit issued by the New York State Department of Environmental Conservation (NYSDEC). To facilitate your compliance with the law, NYSDEC has issued a General Permit which may be applicable to your project. To obtain coverage under this General Permit, you need to prepare a Stormwater Pollution Prevention Plan (SWPPP) and then file a Notice of Intent(NOI) to the NYSDEC headquarters in Albany. The NOI form is available on the DEC website. You may also obtain a copy of the NOI form at the nearest NYSDEC regional offices. When you file your NOI you are certifying that you have developed a SWPPP and that it will be implemented prior to commencing construction. When you submit the NOI you need to indicate if your SWPPP is in conformance with published NYSDEC technical standards; if it is, your SPDES permit coverage will be effective in as few as five business days. If your SWPPP does not conform to the DEC technical standards, coverage will not be available for at least 60 business days. Failure to have the required permit can result in legal actions which include Stop Work Orders and/or monetary penalties of up to $37,500/day If your construction operations are already in progress and you are not covered by an appropriate NYSDEC permit contact the NYSDEC Regional Water Engineer as soon as possible. If your construction field operations have not yet commenced, review the NOI and the General Permit on the DEC's website or at the DEC regional office for your area. When you are comfortable that you understand and comply with the requirements, file your NOI. The requirement to file an NOI does not replace any local requirements. Developers/Contractors are directed to contact the Local Code Enforcement Officer or Stormwater Management Officer for local requirements. 14 ATTACHMENT 3 -- Mr. John Smith 123 Main Street Ferracane, NY 12345 Re: Stormwater Inspection SPDES Permit Identification No. NYR10Z000 (through SPDES No. GP-02-01) Blowing Leaves Subdivision Gasper (T), Eaton (Co.) Dear Mr. Smith: On the afternoon of<< dal:(.: ..�> I conducted an inspection of the construction activities associated with the Blowing Leaves Subdivision located on County Route 1 in the town of Gasper, Eaton County. The inspection was conducted in the presence of you and Mr. Samuel Siltfence of Acme Excavating Co., Inc. The purpose of the inspection was to verify compliance with the State Pollutant Discharge Elimination System (SPDES) General Permit for Storm Water Discharges from Construction Activity ("the general permit"). The overall rating for the project at the time of the inspection was unsatisfactory. A copy of my inspection report is attached for your information. In addition to the report, I would like to elaborate on the following: SPDES Authority • In accordance with subdivision 750-2.1 (a) of Title 6 of the Official Compilation of Codes, Rules, and Regulations of the State of New York(6 NYCRR), a copy of your permit must be retained at the construction site. You did not have a copy of the general permit at the site. Your failure to retain a copy of the general permit at the construction site is a violation of 6 NYCRR Part 750-2.1 (a). Please retain a copy of the general permit at the site from this point forward. SWPPP Content • In accordance with Part IILE.2. of the general permit, contractors and subcontractors must certify that they understand the terms and conditions of the general permit and the SWPPP before undertaking any construction activity at the site. Your SWPPP does not include a certification statement from Acme Excavating Co., Inc. The failure of your contractor to sign this certification before undertaking construction activity at the site is a violation of Part III.E.2. of the general permit. Please obtain copies of all necessary certifications and provide copies of them to each party who holds a copy of your SWPPP. • In accordance with Part V.1-1.2. of the general permit, SWPPP's must be certified by the permittee. Your SWPPP was not certified by you. Your failure to certify your SWPPP is a 15 Mr. John Smith ➢ � """" Re: SPDES Inspection Blowing Leaves Subdivision Gasper(T), Eaton(Co.) violation of Part V.H.2. of the general permit. Please certify your SWPPP. Recordkeeping • In accordance with Parts III.D.3.a. and III.D.3.b. of the general permit,permittees must have a qualified professional conduct site inspections within 24 hours of the end of 0.5" or greater rain events and at least once per week. A review of your records revealed that your"self- inspections" are only being conducted about two or three times per month. Your failure to have a qualified professional conduct inspections at the required frequency is a violation of Part IILD.3.b. of the general permit. Please immediately direct your qualified professional to conduct your site inspections at the required frequency. • Although the frequency of self-inspections does not meet rquirements, the quality of them is very good. Your qualified professional has accurately noted the same SWPPP deficiencies and necessary maintenance activities that I also observed, and prepared thorough sketches on the self-inspection site maps. • In accordance with Part V.H.2. of the general permit, the permittee must certify all reports required by the permit. A review of your records showed that your self-inspection reports were not certified. Your failure to certify your self-inspection reports is a violation of Part V.H.2. of the general permit. Please sign and certify any and all existing and future self- inspection reports. Visual Observations • In accordance with Parts III.A.2. and III.A.3. of the general permit, all erosion and sediment controls (E&SC) measures must be installed (as detailed in the SWPPP)prior to the initiation of construction. During the inspection, I noted all of your E&SC measures have been correctly installed at the right times and locations. • In accordance with Part V.L. of the general permit, all of the E&SC measures at your site must be maintained properly. While on site I observed that, among other things, the section of silt fence in place parallel to County Route 1 is in various stages of disrepair. The failure of your contractor to adequately maintain the E&SC measures currently in place at your site is a violation of Part V.L of the general permit. Please direct your contractor to repair this silt fence immediately and to diligently maintain all of the other required E&SC measures as they are brought to his attention by your qualified professional. • This inspection was conducted during a rain event which resulted in a stormwater discharge to the municipal separate storm sewer system (MS4) being operated by the Eaton County Department of Public Works. Your discharge was visibly turbid whereas upstream water MS4 was clear. As a result, the discharge from the MS4 outfall into Karimipour Creek was causing 16 Mr. John Smith ➢ � """" Re: SPDES Inspection Blowing Leaves Subdivision Gasper(T), Eaton(Co.) slight turbidity. Please be advised that the narrative water quality standard for turbidity in Karimipour Creek is "no increase that will cause a substantial visible contrast to natural conditions." I attribute the lack of maintenance of your E&SC measures to be the primary cause of the turbid discharge. Please be reminded that the general permit does not authorize you cause or contribute to a condition in contravention of any water quality standards. If you have any questions or comments,please feel free to contact me at(999) 456-5432. Sincerely, Hector D. Inspector, CPESC Environmental Program Specialist 2 HDLms Attachment cc w/att.: Chester Checkdam, (T) Gasper Code Enforcement Officer Samuel Siltfence, Acme Excavating Co., Inc. 17 Construction Site Log Book & Operators Certification APPENDIX H STATE POLLUTANT DISCHARGE ELIMINATION SYSTEM FOR CONSTRUCTION ACTIVITIES CONSTRUCTION SITE LOG BOOK Table of Contents I. Pre-Construction Meeting Documents a. Preamble to Site Assessment and Inspections b. Operator's Certification C. Qualified Professional's Credentials & Certification d. Pre-Construction Site Assessment Checklist IL Construction Duration Inspections a. Directions b. Modification to the SWPPP III. Monthly Summary Reports IV. Monitoring, Reporting, and Three-Month Status Reports a. Operator's Compliance Response Form Properly completing forms such as those contained in Appendix H meet the inspection requirement of NYS- DEC SPDES GP for Construction Activities. Completed forms shall be kept on site at all times and made avail- able to authorities upon request. August 2005 Page H1 New York Standards and Specifications For Erosion and Sediment Control I. PRE-CONSTRUCTION MEETING DOCUMENTS Project Name Permit No. Date of Authorization Name of Operator Prime Contractor a. Preamble to Site Assessment and Inspections The Following Information To Be Read By All Person's Involved in The Construction of Stormwater Re- lated Activities: The Operator agrees to have a qualified professional'conduct an assessment of the site prior to the com- mencement of construction and certify in this inspection report that the appropriate erosion and sediment controls described in the SWPPP have been adequately installed or implemented to ensure overall prepared- ness of the site for the commencement of construction. Prior to the commencement of construction,the Operator shall certify in this site logbook that the SWPPP has been prepared in accordance with the State's standards and meets all Federal, State and local erosion and sediment control requirements. When construction starts, site inspections shall be conducted by the qualified professional at least every 7 calendar days and within 24 hours of the end of a storm event of 0.5 inches or greater(Construction Dura- tion Inspections). The Operator shall maintain a record of all inspection reports in this site logbook. The site logbook shall be maintained on site and be made available to the permitting authorities upon request. The Operator shall post at the site,in a publicly accessible location, a summary of the site inspection activities on a monthly basis (Monthly Summary Report). The operator shall also prepare a written summary of compliance with this general permit at a minimum frequency of every three months (Operator's Compliance Response Form),while coverage exists. The sum- mary should address the status of achieving each component of the SWPPP. Prior to filing the Notice of Termination or the end of permit term,the Operator shall have a qualified pro- fessional perform a final site inspection. The qualified professional shall certify that the site has undergone final stabilization' using either vegetative or structural stabilization methods and that all temporary erosion and sediment controls (such as silt fencing)not needed for long-term erosion control have been removed. In addition,the Operator must identify and certify that all permanent structures described in the SWPPP have been constructed and provide the owner(s)with an operation and maintenance plan that ensures the structure(s) continuously functions as designed. 1 "Qualified Professional means a person knowledgeable in the principles and practice of erosion and sediment controls, such as a Certified Professional in Erosion and Sediment Control(CPESC),soil scientist,licensed engineer or someone working under the direction and supervision of a licensed engineer(person must have experience in the principles and practices of erosion and sediment control). 2"Commencement of construction"means the initial removal of vegetation and disturbance of soils associated with clearing,grading or excavating activities or other construction activities. 3 "Final stabilization"means that all soil-disturbing activities at the site have been completed and a uniform,perennial vegetative cover with a density of eighty(80)percent has been established or equivalent stabilization measures(such as the use of mulches or geotextiles)have been employed on all unpaved areas and areas not covered by permanent struc- tures. New York Standards and Specifications Page H.2 August 2005 For Erosion and Sediment Control b. Operators Certification "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information,the information submitted is,to the best of my knowledge and belief,true, accurate, and complete. Further,I hereby certify that the SWPPP meets all Federal, State, and local erosion and sediment control requirements. I am aware that false statements made herein are punishable as a class A misdemeanor pursuant to Section 210.45 of the Penal Law. Name (please print): Title Date: Address: Phone: Email: Signature: c. Qualified Professional's Credentials & Certification "I hereby certify that I meet the criteria set forth in the General Permit to conduct site inspections for this project and that the appropriate erosion and sediment controls described in the SWPPP and as described in the following Pre-construction Site Assessment Checklist have been adequately installed or implemented, ensuring the overall preparedness of this site for the commencement of construction." Name (please print): Title Date: Address: Phone: Email: Signature: August 2005 Page H.3 New York Standards and Specifications For Erosion and Sediment Control d. Pre-construction Site Assessment Checklist (NOTE: Provide comments below as necessary) 1.Notice of Intent, SWPPP, and Contractors Certification: Yes No NA [] [] [] Has a Notice of Intent been filed with the NYS Department of Conservation? [] [] [] Is the SWPPP on-site? Where? [] [] [] Is the Plan current? What is the latest revision date? [] [] [] Is a copy of the NOI(with brief description) onsite? Where? [] [] [] Have all contractors involved with stormwater related activities signed a contractor's certification? 2. Resource Protection Yes No NA [] [] [] Are construction limits clearly flagged or fenced? [] [] [] Important trees and associated rooting zones, on-site septic system absorption fields, existing vegetated areas suitable for filter strips, especially in perimeter areas,have been flagged for protection. [] [] [] Creek crossings installed prior to land-disturbing activity,including clearing and blasting. 3. Surface Water Protection Yes No NA [] [] [] Clean stormwater runoff has been diverted from areas to be disturbed. [] [] [] Bodies of water located either on site or in the vicinity of the site have been identified and protected. [] [] [] Appropriate practices to protect on-site or downstream surface water are installed. [] [] [] Are clearing and grading operations divided into areas<5 acres? 4. Stabilized Construction Entrance Yes No NA [] [] [] A temporary construction entrance to capture mud and debris from construction vehicles before they enter the public highway has been installed. [] [] [] Other access areas (entrances, construction routes, equipment parking areas) are stabilized immediately as work takes place with gravel or other cover. [] [] [] Sediment tracked onto public streets is removed or cleaned on a regular basis. 5.Perimeter Sediment Controls Yes No NA [] [] [] Silt fence material and installation comply with the standard drawing and specifications. [] [] [] Silt fences are installed at appropriate spacing intervals [] [] [] Sediment/detention basin was installed as first land disturbing activity. [] [] [] Sediment traps and barriers are installed. 6. Pollution Prevention for Waste and Hazardous Materials Yes No NA [] [] [] The Operator or designated representative has been assigned to implement the spill prevention avoidance and response plan. [] [] [] The plan is contained in the SWPPP on page [] [] [] Appropriate materials to control spills are onsite.Where? New York Standards and Specifications Page H.4 August 2005 For Erosion and Sediment Control II.CONSTRUCTION DURATION INSPECTIONS a. Directions: Inspection Forms will be filled out during the entire construction phase of the project. Required Elements: (1) On a site map, indicate the extent of all disturbed site areas and drainage pathways. Indicate site areas that are expected to undergo initial disturbance or significant site work within the next 14-day period; (2) Indicate on a site map all areas of the site that have undergone temporary or permanent stabilization; (3) Indicate all disturbed site areas that have not undergone active site work during the previous 14-day period; (4) Inspect all sediment control practices and record the approximate degree of sediment accumulation as a percentage of sediment storage volume (for example, 10 percent, 20 percent, 50 percent); (5) Inspect all erosion and sediment control practices and record all maintenance requirements such as verifying the integrity of barrier or diversion systems (earthen berms or silt fencing) and containment systems (sediment basins and sediment traps). Identify any evidence of rill or gully erosion occurring on slopes and any loss of stabilizing vegetation or seeding/mulching. Document any excessive deposition of sediment or ponding water along barrier or diversion systems. Record the depth of sediment within containment structures, any erosion near outlet and overflow structures, and verify the ability of rock filters around perforated riser pipes to pass water; and (6) Immediately report to the Operator any deficiencies that are identified with the implementation of the SWPPP. August 2005 Page H.5 New York Standards and Specifications For Erosion and Sediment Control CONSTRUCTION DURATION INSPECTIONS Page 1 of SITE PLAN/SKETCH Inspector (print name) Date of Inspection Qualified Professional(print name) Qualified Professional Signature The above signed acknowledges that, to the best of his/her knowledge, all information provided on the forms is accurate and complete. New York Standards and Specifications Page H.6 August 2005 For Erosion and Sediment Control CONSTRUCTION DURATION INSPECTIONS Page 2 of Maintaining Water Quality Yes No NA [ ] [ ] [ ] Is there an increase in turbidity causing a substantial visible contrast to natural conditions? [ ] [ ] [ ] Is there residue from oil and floating substances,visible oil film, or globules or grease? [ ] [] [ ] All disturbance is within the limits of the approved plans. [ ] [ ] [ ] Have receiving lake/bay, stream, and/or wetland been impacted by silt from project? Housekeeping 1. General Site Conditions Yes No NA [ ] [ ] [ ] Is construction site litter and debris appropriately managed? [ ] [ ] [ ] Are facilities and equipment necessary for implementation of erosion and sediment control in working order and/or properly maintained? [ ] [ ] [ ] Is construction impacting the adjacent property? L ] L ] L ] Is dust adequately controlled? 2. Temporary Stream Crossing Yes No NA [ ] [ ] [ ] Maximum diameter pipes necessary to span creek without dredging are installed. [ ] [ ] [ ] Installed non-woven geotextile fabric beneath approaches. [ ] [ ] [ ] Is fill composed of aggregate(no earth or soil)? [ ] [ ] [ ] Rock on approaches is clean enough to remove mud from vehicles &prevent sediment from entering stream during high flow. Runoff Control Practices 1. Excavation Dewatering Yes No NA [ ] [ ] [ ] Upstream and downstream berms (sandbags,inflatable dams, etc.) are installed per plan. [ ] [ ] [ ] Clean water from upstream pool is being pumped to the downstream pool. [ ] [ ] [ ] Sediment laden water from work area is being discharged to a silt-trapping device. [ ] [ ] [ ] Constructed upstream berm with one-foot minimum freeboard. 2. Level Spreader Yes No NA [ ] [ ] [ ] Installed per plan. [ ] [ ] [ ] Constructed on undisturbed soil,not on fill,receiving only clear,non-sediment laden flow. [ ] [ ] [ ] Flow sheets out of level spreader without erosion on downstream edge. 3. Interceptor Dikes and Swales Yes No NA [ ] [ ] [ ] Installed per plan with minimum side slopes 2H:1 V or flatter. [ ] [ ] [ ] Stabilized by geotextile fabric, seed, or mulch with no erosion occurring. [ ] [ ] [ ] Sediment-laden runoff directed to sediment trapping structure August 2005 Page H.7 New York Standards and Specifications For Erosion and Sediment Control CONSTRUCTION DURATION INSPECTIONS Page 3 of Runoff Control Practices (continued) 4. Stone Check Dam Yes No NA [ ] [] [ ] Is channel stable? (flow is not eroding soil underneath or around the structure). [ ] [ ] [ ] Check is in good condition (rocks in place and no permanent pools behind the structure). [ ] [ ] [ ] Has accumulated sediment been removed?. 5. Rock Outlet Protection Yes No NA [ ] [ ] [ ] Installed per plan. [ ] [ ] [ ] Installed concurrently with pipe installation. Soil Stabilization 1. Topsoil and Spoil Stockpiles Yes No NA [ ] [ ] [ ] Stockpiles are stabilized with vegetation and/or mulch. [ ] [ ] [ ] Sediment control is installed at the toe of the slope. 2. Revegetation Yes No NA [ ] [ ] [ ] Temporary seedings and mulch have been applied to idle areas. [ ] [ ] [ ] 4 inches minimum of topsoil has been applied under permanent seedings Sediment Control Practices 1. Stabilized Construction Entrance Yes No NA [ ] [ ] [ ] Stone is clean enough to effectively remove mud from vehicles. [ ] [ ] [ ] Installed per standards and specifications? [ ] [ ] [ ] Does all traffic use the stabilized entrance to enter and leave site? [ ] [ ] [ ] Is adequate drainage provided to prevent ponding at entrance? 2. Silt Fence Yes No NA [ ] [ ] [ ] Installed on Contour, 10 feet from toe of slope(not across conveyance channels). [ ] [ ] [ ] Joints constructed by wrapping the two ends together for continuous support. [ ] [ ] [ ] Fabric buried 6 inches minimum. [ ] [ ] [ ] Posts are stable, fabric is tight and without rips or frayed areas. Sediment accumulation is % of design capacity. New York Standards and Specifications Page H.8 August 2005 For Erosion and Sediment Control CONSTRUCTION DURATION INSPECTIONS Page 4 of Sediment Control Practices (continued) 3. Storm Drain Inlet Protection(Use for Stone & Block; Filter Fabric; Curb; or,Excavated practices) Yes No NA [ ] [ ] [ ] Installed concrete blocks lengthwise so open ends face outward,not upward. [ ] [ ] [ ] Placed wire screen between No. 3 crushed stone and concrete blocks. [ ] [ ] [ ] Drainage area is Iacre or less. [ ] [ ] [ ] Excavated area is 900 cubic feet. [ ] [ ] [ ] Excavated side slopes should be 2:1. L L L 2"x 4" frame is constructed and structurally sound. [ ] [ ] [ ] Posts 3-foot maximum spacing between posts. [ ] [ ] [ ] Fabric is embedded I to 1.5 feet below ground and secured to frame/posts with staples at max fl- inch spacing. [ ] [ ] [ ] Posts are stable, fabric is tight and without rips or frayed areas. Sediment accumulation % of design capacity. 4. Temporary Sediment Trap Yes No NA [ ] [ ] [ ] Outlet structure is constructed per the approved plan or drawing. [ ] [ ] [ ] Geotextile fabric has been placed beneath rock fill. Sediment accumulation is % of design capacity. 5. Temporary Sediment Basin Yes No NA [ ] [ ] [ ] Basin and outlet structure constructed per the approved plan. [ ] [ ] [ ] Basin side slopes are stabilized with seed/mulch. [ ] [ ] [ ] Drainage structure flushed and basin surface restored upon removal of sediment basin facility. Sediment accumulation is % of design capacity. Note: Not all erosion and sediment control practices are included in this listing. Add additional pages to this list as required by site specific design. Construction inspection checklists for post-development stormwater management practices can be found in Appendix F of the New York Stormwater Management Design Manual. August 2005 Page H.9 New York Standards and Specifications For Erosion and Sediment Control CONSTRUCTION DURATION INSPECTIONS b. Modifications to the SWPPP (To be completed as described below) The Operator shall amend the SWPPP whenever: 1. There is a significant change in design, construction, operation, or maintenance which may have a significant effect on the potential for the discharge of pollutants to the waters of the United States and which has not otherwise been addressed in the SWPPP; or 2. The SWPPP proves to be ineffective in: a. Eliminating or significantly minimizing pollutants from sources identified in the SWPPP and as required by this permit; or b. Achieving the general objectives of controlling pollutants in stormwater discharges from permitted construction activity; and 3. Additionally, the SWPPP shall be amended to identify any new contractor or subcontractor that will implement any measure of the SWPPP. Modification &Reason: New York Standards and Specifications Page H.10 August 2005 For Erosion and Sediment Control III. Monthly Summary of Site Inspection Activities Name of Permitted Facility: Today's Date: eporting Month: Location: Permit Identification#: Name and Telephone Number of Site Inspector: Date of Regular /Rainfall Inspection based Inspection Name of Inspector Items of Concern Owner/Operator Certification: "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted.Based on my inquiry of the person or persons who manage the system,or those persons directly responsible for gathering the information,the information submitted is,to the best of my knowledge and belief,true,accurate,and complete. I am aware that false statements made herein are punishable as a class A misdemeanor pursuant to Section 210.45 of the Penal Law." Signature of Permittee or Duly Authorized Representative Name of Permittee or Duly Authorized Representative Date Duly authorized representatives must have written authorization, submitted to DEC, to sign any permit documents. August 2005 Page H.11 New York Standards and Specifications For Erosion and Sediment Control NYSDEC Notice of Termination Form New York State Department of Environmental Conservation Division of Water 625 Broadway, 4th Floor Albany, New York 12233-3505 *(NOTE: Submit completed form to address above)* NOTICE OF TERMINATION for Storm Water Discharges Authorized under the SPDES General Permit for Construction Activity Please indicate your permit identification number: NYR I. Owner or Operator Information 1. Owner/Operator Name: 2. Street Address: 3. City/State/Zip: 4. Contact Person: 4a.Telephone: 4b. Contact Person E-Mail: II. Project Site Information 5. Project/Site Name: 6. Street Address: 7. City/Zip: 8. County: III. Reason for Termination 9a. ❑All disturbed areas have achieved final stabilization in accordance with the general permit and SWPPP. *Date final stabilization completed (month/year): 9b. ❑ Permit coverage has been transferred to new owner/operator. Indicate new owner/operator's permit identification number: NYR (Note: Permit coverage can not be terminated by owner identified in 1.1. above until new owner/operator obtains coverage under the general permit) 9c. ❑ Other(Explain on Page 2) IV. Final Site Information: 10a. Did this construction activity require the development of a SWPPP that includes post-construction stormwater management practices? ❑ yes ❑ no ( If no, go to question 1 Of.) 10b. Have all post-construction stormwater management practices included in the final SWPPP been constructed? ❑ yes ❑ no (If no, explain on Page 2) 10c. Identify the entity responsible for long-term operation and maintenance of practice(s)? Page 1 of 3 NOTICE OF TERMINATION for Storm Water Discharges Authorized under the SPDES General Permit for Construction Activity-continued 10d. Has the entity responsible for long-term operation and maintenance been given a copy of the operation and maintenance plan required by the general permit? ❑ yes ❑ no 10e. Indicate the method used to ensure long-term operation and maintenance of the post-construction stormwater management practice(s): ❑ Post-construction stormwater management practice(s) and any right-of-way(s) needed to maintain practice(s) have been deeded to the municipality. ❑ Executed maintenance agreement is in place with the municipality that will maintain the post-construction stormwater management practice(s). ❑ For post-construction stormwater management practices that are privately owned, a mechanism is in place that requires operation and maintenance of the practice(s) in accordance with the operation and maintenance plan, such as a deed covenant in the owner or operator's deed of record. ❑ For post-construction stormwater management practices that are owned by a public or private institution (e.g. school, university or hospital), government agency or authority, or public utility; policy and procedures are in place that ensures operation and maintenance of the practice(s) in accordance with the operation and maintenance plan. 1 Of. Provide the total area of impervious surface (i.e. roof, pavement, concrete, gravel, etc.)constructed within the disturbance area? (acres) 11. Is this project subject to the requirements of a regulated, traditional land use control MS4? ❑ yes ❑ no (If Yes, complete section VI - "MS4 Acceptance" statement V. Additional I nformation/Exp la nation: (Use this section to answer questions 9c. and 10b., if applicable) VI. MS4 Acceptance -MS4 Official (principal executive officer or ranking elected official) or Duly Authorized Representative (Note: Not required when 9b. is checked -transfer of coverage) I have determined that it is acceptable for the owner or operator of the construction project identified in question 5 to submit the Notice of Termination at this time. Printed Name: Title/Position: Signature: Date: Page 2 of 3 NOTICE OF TERMINATION for Storm Water Discharges Authorized under the SPDES General Permit for Construction Activity -continued VII. Qualified Inspector Certification - Final Stabilization: I hereby certify that all disturbed areas have achieved final stabilization as defined in the current version of the general permit, and that all temporary, structural erosion and sediment control measures have been removed. Furthermore, I understand that certifying false, incorrect or inaccurate information is a violation of the referenced permit and the laws of the State of New York and could subject me to criminal, civil and/or administrative proceedings. Printed Name: Title/Position: Signature: Date: VIII. Qualified Inspector Certification -Post-construction Stormwater Management Practice(s): I hereby certify that all post-construction stormwater management practices have been constructed in conformance with the SWPPP. Furthermore, I understand that certifying false, incorrect or inaccurate information is a violation of the referenced permit and the laws of the State of New York and could subject me to criminal, civil and/or administrative proceedings. Printed Name: Title/Position: Signature: Date: IX. Owner or Operator Certification I hereby certify that this document was prepared by me or under my direction or supervision. My determination, based upon my inquiry of the person(s)who managed the construction activity, or those persons directly responsible for gathering the information, is that the information provided in this document is true, accurate and complete. Furthermore, I understand that certifying false, incorrect or inaccurate information is a violation of the referenced permit and the laws of the State of New York and could subject me to criminal, civil and/or administrative proceedings. Printed Name: Title/Position: Signature: Date: (NYS DEC Notice of Termination -January 2015) Page 3 of 3