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Stormwater Management STORMWATER MANAGEMENT REPORT Prepared for: Misssion and Montcalm RE LLC Barber Road Tax Map #'s 289.11-1-12.1 Town of Queensbury Warren County, New York Prepared by: Hutchins Engineering 169 Haviland Road Queensbury, NY 12804 March 13, 2018 Project Description The project consists of the construction of a new 3-bedroom home along with a new on-site wastewater system and well, landscaping, and stormwater management upon a vacant 1.6-acre parcel. The parcel is situated at the corners of Barber Road and Hall Road, where those roads form the easterly and westerly borders of the parcel, in the Town of Queensbury, Warren County, New York. Project disturbance totals approximately 24,400 square-feet. Existing Site Conditions Presently, the parcel is vacant and is mostly open-space, consisting of field grass and brush. West of the house site, the parcel slopes steeply down to Hall Road at 30-50%. North of the house site, the parcel slopes down towards the intersection of the roads at 15-30%. The house and drive will be constructed on the high ground, towards the southerly property line, which has a much gentler slope, to the north and east at 5-15%. Design Storm Events: 25-year, 24hr, Type-ll distribution, 4.5" Existing Conditions Calculated Stormwater Runoff from the Site: Design Point 1 —Westerly Runoff 25 -year design storm (4.5") 0.02 cfs 0.008 acre-feet Design Point 2— Runoff to Hall Rd 25 -year design storm (4.5") 0.04 cfs 0.014 acre-feet Design Point 3— Northwesterly Runoff 25 -year design storm (4.5") 0.02 cfs 0.006 acre-feet Proposed Stormwater Management For residential projects, the Town of Queesbury requires that 25-year design storm be evaluated in predeveloped vs. developed site conditions. Runoff from the proposed drive, parking area and the front portion of the house will be conveyed to a 2-ft deep vegetated detention area, which will be constructed north of the drive. Runoff from the remainder of the house will also be captured in a roof gutter and will be piped to a subsurface infiltration trench with stormwater chambers. Runoff calculations have been prepared utilizing SCS TR-20 methodology and HydroCAD analysis software for 25-year Type-ll simulated rainfall distributions. Criteria utilized in the analysis are summarized as follows: Design Storm Events: 25-year, 24hr, Type-ll distribution, 4.5" Proposed Conditions Calculated Stormwater Runoff from the Site: Design Point 1 —Westerly Runoff 25 -year design storm (4.5") 0.02 cfs 0.008 acre-feet Design Point 2— Runoff to Hall Rd 25 -year design storm (4.5") 0.02 cfs 0.008 acre-feet Design Point 3— Northwesterly Runoff 25 -year design storm (4.5") 0.02 cfs 0.007 acre-feet The developed site has been modeled as a series of subcatchments (drainage areas) and ponds, as shown on the HydroCAD drainage diagram. Full results of stormwater runoff computations are attached to this report. Results The analyses show that the vegetated detention area and subsurface infiltration bed is of adequate capacity to manage calculated runoff from the proposed construction for the design storm event. Construction Phase Erosion Practices Practices to be implemented during construction for erosion and sediment control include silt fencing and temporary sediment traps in various portions of the total disturbed area. Silt fencing will be placed across slopes (on the contour) in all areas downgrade of disturbed areas. Temporary sediment traps will be utilized in areas where construction phase runoff concentrates. Temporary Erosion and Sediment Control Measures Erosion and sediment control measures will be incorporated into the construction of the project. These practices will comply with the New York State Department of Environmental Conservation publication entitled "New York State Standards and Specifications for Erosion and Sediment Control' (the blue book). The following temporary erosion and sediment control devices are to be utilized: Sediment Control Fence Silt Fence shall be used to control erosion from sheet flow on slopes not to exceed 1 on 3. 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 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 14-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. 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 biodegradable mesh blankets shall be utilized to protect and temporarily stabilize slopes of 1:3 or greater and applied to graded, topsoiled and seeded slopes. Blankets will be attached with staples or stakes in accordance with manufacturer's recommendations. Blankets will be maintained in place until permanent groundcover is firmly established. Control of Litter, Construction Debris and Construction Chemicals During the course of construction, the site shall be kept clear of debris and litter which could be transported by water or wind. This material shall be picked up daily and shall be stored in waste debris containers where it will be securely held. All petroleum products or other waste contaminants which are water soluble, or could be dispersed and transported by stormwater, shall be stored in covered containers and be regularly removed from the site and properly and legally disposed of. All petroleum or other hazardous materials shall be stored and handled in conformance with NYSDEC spill prevention and containment requirements. Sequence of Construction Prior to the start of construction, the contractor shall install the sediment control fence along the low side of each area to be disturbed to contain runoff from the construction site. Following the completion of all planting and the establishment of all grass areas, any collected sediment and sediment control fencing shall be removed. Any debris from the perimeter of the site shall be removed and all waste material shall be disposed of in a legal manner. Maintenance of Temporary Erosion & Sediment Control Devices The contractor shall inspect the sediment control fence weekly and after every rain event and remove trapped sediment and maintain the devices such that they are in good working order. Stormwater Operation & Maintenance Plan The parcel owner is to provide the maintenance needed in order to ensure continuous and effective operation of the stormwater control practices. Sediment removal should be performed annually or semi-annually in the vegetated detention area and roof gutters. Mowing and trimming of the vegetated slopes should be performed as needed throughout the spring, summer and fall, typically semi-weekly. Any eroded areas shall be immediately repaired, retopsoiled, revegetated and covered with erosion control blankets. Permanent Erosion Control All pervious areas shall be graded, topsoil installed and seeded or planted as soon as practical. Seed beds shall be mulched with straw and plant beds shall be mulched with pine bark mulch. Seeded areas on slopes over 1:3 shall be stabilized with erosion control netting as specified on the plans. Attachments • Soils Map • Subcatchment Map— Existing Model • Subcatchment Map— Proposed Model HydroCAD Existing Condition —Type-11 24 hr Rainfall = 4.5" (25-year) - Proposed Condition —Type-11 24 hr Rainfall = 4.5" (25-year) Soils Map ... .:1••� nd 'nti 91 • •� pan�Ivv :sapruss - . .1.wntRr .. Ni 1p ee li ' ndy ham,8 Op{v o my an..� u.e oln • D�—nl Ifo I tlo llkW Af 1 � Ir yy In Amy walnr H fry•PIRq}NId � • P 4plppMx 614op ti Existing Conditions P6 H 4 W6 3L0 f ! A \ Arm 70102.. Feet .1 1.Bt a �C / F \ / F / f Ir \\ ,r W6 f / -JL-- I --4P- i t4 14 V4 y16F LA �jo- .► - \`� �f/ r 06 9 F EXISTING DRAINAGE SUBCATCHMENTS 169 Havilond Road prepared for. 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