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Stormwate management report STORMWATER MANAGEMENT REPORT Prepared for: Queensbury Square, LLC Monty's Discount Wine & Liquor & New 42'x130' Retail Building l� Corner of Weeks Rd & NYS Rt 9 I Tax Map # 296.17-1-38 i Town of Queensbury Warren County, New York 1 Prepared by: Hutchins Engineering 169 Haviland Road Queensbury, NY 12804 November 15, 2017 4 TABLE OF CONTENTS 1.0 PROJECT DESCRIPTION .............................................................................. 1 2.0 EXISTING SITE CONDITIONS ........................................................................ 1 3.0 PROPOSED DEVELOPMENT ......................................................................... 2 4.0 PROPOSED STORMWATER MANAGEMENT ................................................... 2 5.0 TOWN OF QUEENSBURY REQUIREMENTS .......................................................... 6 6.0 CONSTRUCTION PHASE EROSION PRACTICES ................................................... 7 7.0 TEMPORARY EROSION &SEDIMENT CONTROL MEASURES ................................. 7 8.0 CONTROL OF LITTER, CONSTRUCTION DEBRIS & CONSTRUCTION CHEMICALS .... 8 9.0 SEQUENCE OF CONSTRUCTION ........................................................................ 8 10.0 MAINTENANCE OF TEMPORARY EROSION & SEDIMENT CONTROL DEVICES 8 11.0 OPERATION & MAINTENANCE PLAN ................................................................... 8 12.0 PERMANENT EROSION CONTROL ...................................................................... 9 1.0 PROJECT DESCRIPTION The project consists of the construction of a 42'x130' slab-on-grade, wood framed building for commercial retail use, a parking area with 27 spaces and a service road from Weeks Road. Also associated with the project is the construction of utilities, lighting, landscaping and stormwater management. The parcel is 1.42-acres at the southwest corner of State Rt. 9 and Weeks Road in the Town of Queensbury, Warren County, New York and presently contains the commercial business of Monty's Discount Wines and Liquors. Project disturbance totals 0.8-acres. 2.0 EXISTING SITE CONDITIONS The project site is partially developed over it's easterly half, containing the liquor store and parking and the remaining westerly portions have been mostly cleared and are vacant field, with a 2-3% north to south slope. Site soils are mapped as Hinckley Cobbly Sandy Loam, HSG-A which are deep, well drained sandy soils on outwash plains. Several deep soil test pits performed for a previous project encountered fine and medium sands with traces of silt. Existing Conditions Summary Total Project Site Area: 1.42 Acres Building Coverage: 7600 SF Walks, Drives & Parking Areas: 19,900 SF Total Impervious: 28,500 SF Drainage design points The site is broken into one drainage design points: 1 L— Runoff to South Design $t9rm Events: 50-year, 24hr, Type-II distribution, 4.8" Existing Conditions Calculated Stormwater Runoff to South—1L 50-year design storm (4.8") 1.23 CFS 0.069 acre-feet 3.0 PROPOSED DEVELOPMENT I Proposed Conditions Summary Total Project Site Area: 1.42 Acres Building Coverage: 12,460 SF Walks, Drives & Parking Areas: 29,210 SF Total Impervious: 43,270 SF Project Disturbance: 0.8 Acres I 4.0 PROPOSED STORMWATER MANAGEMENT As this is a commercial project with soil disturbances not exceeding 1-acre, NYSDEC SPDES requirements for stormwater discharges from construction activities do not apply to the project. The Town of Queensbury requires that commercial projects must implement stormwater management practices designed to manage the 50-year design storm event. Runoff from the front portion of the new building, parking and sidewalk areas will flow across the new parking area will flow into vegetated detention areas, with 8-ft diameter drywells installed in the base of these detention areas. Runoff from the rear of the building will be captured and infiltrated in a 3-ft wide stone filled eave trench. Runoff from the new service road and from adjacent portions of Weeks Road will be captured in a vegetated swale constructed between the service road and Weeks Road, which will have two 8-ft drywells installed in it's base. An infiltration rate of 10-inches per hour is utilized for the infiltration facilities. Runoff calculations have been prepared utilizing SCS TR-20 methodology and HydroCAD analysis software for the 50- year Type-II simulated rainfall distributions. Criteria utilized in the analysis are summarized as follows: Desic in Storm Events: 50-year, 24hr, Type-II distribution, 4.8" Developed Conditions Calculated Stormwater Runoff to South—1 L 50-year design storm (4.8") 0.00 CFS 0.000 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. 5.0 TOWN OF QUEENSBURY REQUIREMENTS The Town of Queensbury requires that for commercial projects, the 50-year design storm event be evaluated. Existing 50-year peak storm volume: 0.069 AF Developed 50-year peak storm volume: 0.0 AF Existing 50-year peak storm discharge: 1.23 CFS Developed 50-year peak storm discharge: 0.0 CFS The 50-year storm calculations show that the Town's requirements for commercial projects are met. 6.0 CONSTRUCTION PHASE EROSION PRACTICES Practices to be implemented during construction for erosion and sediment control include silt ! fencing and temporary sediment basins 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. 7.0 TEMPORARY EROSION & 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 Guidelines for Urban and Sediment Control" (the blue book). Separate erosion and sediment controls will be installed for each phase of construction. The following temporary erosion and sediment control devices are to be utilized: 1. 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. 2. 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 five days or longer will be seeded with a ryegrass mixture and mulched to stabilize soil until construction resumes. 3. 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. 4. 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. 5. Erosion Control Blanket Fabricated straw or biodegradable mesh blankets shall be utilized to protect and temporarily stabilize slopes of 1:3 or greater and shall be applied to graded, topsoiled, and seeded slopes. Blankets will be attached with staples or stakes in accordance with manufacturer's recommendations. Blankets on cut slopes and vegetated ditchlines will be maintained in place permanently and allowed to biodegrade. 8.0 CONTROL OF LITTER, CONSTRUCTION DEBRIS & 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 shall 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. 9.0 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 in order to contain runoff from the construction site. Concurrently, the stabilized construction entrance is to be installed. 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 dispose of all waste material shall be disposed of in a legal manner. 10.0 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. 11.0 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 pretreatment/lawn areas and drywells. Mowing and trimming of the vegetated slopes and SMPs 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. 12.0 PERMANENT EROSION CONTROL All pervious areas shall be graded, topsoil installed and seeded or planted as soon as practical, but in no case shall finish graded soils be exposed for more than seven days. Seeded areas on slopes over 1:3 shall be stabilized with erosion control blankets as specified on the plans. ATTACHMENTS • Location Map Soils Map 0 Subcatchment Map— Existing Model HydroCAD — Existing ■ Subcatchment Map— Proposed Model HydroCAD— Proposed HYDROCAD Existing & Proposed Conditions: Type-II 24 hr Rainfall = 4.8" (50-year), ..�Jr �•�..._' __ • _—__—� airy T�'rE;�'.f�y '�::. �- - 7L) r; P Gil' ��_�- �� ' � i���+jam ������ tom- "r' i• ter__= • �1 f�- /r ,. may.. i ;. a Main no ar �, * *V *+lam. 116 In it silo an 00 r � sir `-'G• s" 5f Ir 0 OD f►1 up �4 �b .� (n �sman 1 7' .p �', ti-S��^orf�u-d•,;yid jl.il-;�14ft - 1 Hinckley ty sand ddd ercentsi p Oakville loamy fine sand,8 t oo slopes areham Io mysand 18 1-r 1 Oakville loa s F a _uer-nsbu[,LL(- fine sand,b Xi 7U"VI9,:,: 3 percent slo XI- W:r4!p I Existing Conditions o� o 0 °o- tLL � a � ! oZ M O O � Ln P 0) C r Ln cf Ln, �y � I •L LK`Yi � Q � 1 N I i W V J R v I � o � 0 + o�°gyp` (n N Ilk Is I w 09 I � I � F � I I I 4� a n N O � N m in a c a` U J N 0 C Q F v 0 W m xW p N a) LL d F m E != 2 zQ U 8 m W G c OLU E > uR7 W 2 rn Z W Q Zo m - ~ N j 0 U. 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