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SW REPORT FULL O"I IWATER Z) T ., M . MANAGEMENT REPORT Prepared for: Clute Enterprises 35 Birdsall Road Tax Map # 296.5-1-4.2 Town of Queensbury Warren County, New York Prepared by: Hutchins Engineering 169 Haviland Road Queensbury, NY 12804 January 30, 2017 Pr9j@ct Descrigtign The project consists of the construction of a new 3-bedroom residence with attached garage upon a vacant 1.19-acre parcel on Birdsall Road in the Town of Queensbury, Warren County, New York. Also associated with the project is the construction of a new driveway, wastewater system, landscaping, and stormwater management practices. Project disturbance totals 19,500± square- feet. Existing rte ConditioLig Presently, the project site is vacant and is moderately wooded, with a steep slope to the west of the house site. The wooded portions of the site consist of a mixture of evergreen and deciduous trees and brush. The project site slopes east to west at 10-40%; site soils are mapped as Hinckley-Plainfield Complex and Hinckley Cobbly Sandy Loam, HSG-A. Site slopes over the house site generally range from 10-15%. Design Storm Events: 25-year, 24hr, Type-II distribution, 4.5" Existing Conditions Calculated Stormwater Runoff from the Site: Design Point 1 — Easterly Runoff 25 - year design storm (4.5") 0.01 cfs 0.005 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 house, drive and the upland portions of the parcel behind the house will be directed to a shallow vegetated infiltration area with a 5'W x 15'L x 5'H stone filled infiltration trench. Runoff calculations have been prepared utilizing SCS TR-20 methodology and HydroCAD analysis software for 25-year Type-II simulated rainfall distributions. Criteria utilized in the analysis are summarized as follows: Design Storm Events: 25-year, 24hr, Type-II distribution, 4.5" Proposed Conditions Calculated Stormwater Runoff from the Site: Design Storm Events: 25-year, 24hr, Type-II distribution, 4.5" Design Point 1 — Easterly Runoff 25 - year design storm (4.5") 0.00 cfs 0.003 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 infiltration trench are of adequate capacity to manage calculated runoff from the proposed construction for the design storm. Reductions in both runoff rate and volume are realized from the existing conditions for the 25-year design storms. K;gnstrUgfion ion 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. T_gmRgrAry Erosion and Sedimgnt Col3trgi 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). 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. TemporgEy 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. Temoorary 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. n roi LiMr. r ti n Debris @,nd Constructionhem icgls 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. ewe ence f!;ongtrUction 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, hay bale dams 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" m r Erogion &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. P m!gnent Er sin n r I 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 I-IydrAD Existing Condition —Type-II 24 hr Rainfall = 4.5" (25-year) Proposed Condition —Type-ll 24 hr Rainfall = 4.5" (25-year) Soils Map Ompl »aping W lay °frr Hiin1 alb sandy a a t JJ�z 15 parse a a 11"O"w"I C dNntkla Platntlald A/M ✓G rii,, ! i/ xaa^ PdW, 06t�t lays' i as MAIiii RE !: �9Uara�arn 114 d�°1 �1 n m:n�rr� ffn, $and,,OJO , 1 poraar�tzlota „ no sang.3 t 111n "joy, 041 And ware am � Project Site Existing Conditions Proposed Conditions Z O o .-- SOP �z m w� Is m~ , ' r� "�°wwY � ✓" � � Q ww" ✓" �� rw"' map/" �^""� '""�,„ r' �M'" ✓ »ate' .,. �,�„...�, , r {ry li W 'Mn �lr' Ihi�FwYniws� W. 0 'C CL a LL W Z z $ o U)W a � 3 � 9� Z F= 25 u�a LL LL z D w Q w U) w U Q o � N ITMa r �i E r CN d N d O > a 0) 6 �o N � O � J 12 O L O N N V1 t o c 3 U. o 0 J o LLL O c 2 v w in Q 0 � Q) I Lo c Ln �ao �aa IL 0 Lo Lo c U o o cY Y W o0 o « 0 0 ID 0-0C�1v ~ o0 U) d p a c N L L J C II I M o w3rn3m3 0022 o :3 cn > E a'� chi J >> qoq ZU N F cn 0 a d U � = o U w ELr o W w U m WS rn N c ma m y N oIc Zo N 20 IL a �j N Orr l- a c7 oC%l. 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