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Stormwater Management STORMWATER MANAGEMENT REPORT Prepared for: Lawrence Davis 1 i i 3300 State Rt. 9L — Dark Bay — Lake George Tax Map # 239.18-1-27.2 Town of Queensbury Warren County, New York Prepared by: Hutchins Engineering 169 Haviland Road Queensbury, NY 12804 September 16, 2017 Project Description The project consists of the construction of a new 3-bedroom residence with a walk-out basement on the lakeside having an 885-SF footprint upon a 0.22-acre parcel with 40 feet of lake frontage on Dark Bay on Lake George in the Town of Queensbury, Warren County, New York. Also associated with the project is the construction of a small drive/parking area, construction of a new enhanced treatment wastewater system on the adjacent parcel, landscaping, and stormwater management practices. Project disturbance, including the construction of a shared wastewater system on the adjacent parcel, totals 10,000± square feet. Existing Site Conditions Presently, the project site is vacant and lightly wooded, with a mixture of evergreen and deciduous trees and brush. The project site slopes east to the north towards the lake at 10-20%; site soils are mapped as bice very bouldery fine loamy sand, HSG-B. Soil test pits in the area of the proposed wastewater system revealed fine sandy loam and silty fine sand with a boundary condition at 48 inches and a percolation rate of 4 minutes per inch. Design Storm Events: 10-year, 24hr, Type-II distribution, 3.6" 25-year, 24hr, Type-II distribution, 4.5" Existinq Conditions Calculated Stormwater Runoff from the Site: Design Point 1 - Runoff to Lake 10 -year design storm (3.6") 0.92 cfs 0.046 acre-feet 25 -year design storm (4.5") 1.59 cfs 0.075 acre-feet Proposed Stormwater Management The Town of Queensbury requires that there will be no increase in runoff volume from a 10-year design storm and no increase in runoff rate from a 25-year design storm in predeveloped vs. developed site conditions. Runoff from the roof areas will be captured in roof gutters and piped to a rain garden, and the driveway will be surfaced with permeable asphalt pavement, with its runoff being infiltrated in its stone drainage course. An infiltration rate of 2 inches per hour is taken in the rain gardens and the permeable pavement drainage course. Runoff calculations have been prepared utilizing SCS TR-20 methodology and HydroCAD analysis software for 10-year and 25-year Type-ll simulated rainfall distributions. Criteria utilized in the analysis are summarized as follows: Design Storm Events: 10-year, 24hr, Type-ll distribution, 3.6" 25-year, 24hr, Type-ll distribution, 4.5" Proposed Conditions Calculated Stormwater Runoff from the Site: Design Point 1 - Runoff to Lake 10 -year design storm (3.6") 0.85 cfs 0.042 acre-feet 25 -year design storm (4.5") 1.43 cfs 0.069 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 system of rain gardens and permeable asphalt are of adequate capacity to manage calculated runoff from the proposed house and drive for the design storms. Reductions in both runoff rate and volume are realized from the existing conditions for the 10- and 25-year design storms. 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 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. 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 5 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, 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 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. Permanent Erosion Control 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 Subcatchment Map — Existing Model, Subcatchment Map— Proposed Model HydroCAD - Existing Condition —Type-II 24 hr Rainfall = 3.6" (10-year), 4.5" (25-year) - Proposed Condition —Type-II 24 hr Rainfall = 3.6" (10-year), 4.5" (25-year) C f Existing Conditions RF 330 , [f1 \ Xf 335 I - 1 IIRF 340 5 1 345 O a I I i�••�:�Ss 4�I - 1 V4Y epos r GRT DZV EXISTING SUBCAM MENTS 169 Hovilond Rood prepared for: Queensbury, NY 12804 Hutchins En (518) 745-0307 Phone Lineerin arry Davis g� g (518) 745-0308 Fox r N o � Ncc co a 0 v m c a` J � O O C O v N � pmo E 10 cn �o d 7 OJ w; c E '5m0 � LU O L LL w LU ZC Q�tpp 6 L: I_'. c U v N co m 0 LL LL Z y z 0 LL LL D Lu© O N > o o F Ifl` Z_(n P7 _Z M �x0 z 0 co co U tornm F 7 N 00 O TOi ci � O ci O O O O QL) CL max u oJ W Zo� Y N� x 0 �a 9W= mxo J 7.N W r �N0 LL LL LL Z Q 0 �Y Z Wry J 0 U _Z Q § >7 %)� { � 7 3 w k E _ / / § 0 \ - 2 2 � {/ w & / 0 \ a') ]2/ § / § 0 m &g o 2 a § mac} CD CD § o 1.0 k 2 ; 0\k= § Ao CD CO CD �-0 00 co f } - e § ( ) § k 2 3 U�Ik \§ § / ■ , } c �2 a 4 | /§ ®, §\\ \ z f a _ p c LLJ k $ o EEe 2 w 2(» !5g L) \/» § w a o - ly E . \� 0 Z) ) \(/ \\/ fwd § § CO ( \ z� b2rEkb® -5Z ° ' 2$\ A 7 FI / 3 boo °�\ ƒ %ƒ 00 C G .) zo=< m »» ) ( 3 @ ` /\ � ° 2� o ©== = ® = 4 CD°° 2 §// qe C:--, _ � 0 A " \J ` �� � " k 2 k) © �2 < �� ^� / � 7 f CD 0 CC r \ § ( / mI{ ) Jƒ . . ° t\- I � \ [2 coo kSz k ) /k kk L � 2 `k & �§a) ~ a { }CD )k k ) �£ ) ff r OL g § f � ) > d - �u L) � �\ k� /m0 b =CS k)� -5kC-6 E § ) °� �� %CL ) \§/ *{ A li )/ �� z< §// t=LL co Go LU'R ?t\ / ce §7 �)3 § & 2 � \\ \ ƒ§ ) § § LL 2 a j E § Ir2 § / L2 § mƒ} 2 \ Lf) EN ){ ¥ { $ ƒ ) ) 0 E . 0 4 / § LLCD N 2 ! � w w { Q § k L § / 7 / b/ -0 S a t &/ 0 2 Z b \ §} \ 2 ° | §/0 § A\\ LO A § §¥ |/ ) e \ { )) a) 3§ § J9 t\ ) § # k § i / 4 | o\\ f % )>> \ §� \ \ \S% ()j m � f/® § . v ° \� k \) \ mo f\/( J5 LO /� ci \ [ \ \ z� b )EEk(® � ° ' §\\ A 7 0\ / /%bk«§ CD 0\ ƒ _�ƒ( § s \) zo== � \$( C. 7 § + %k � ® J� C) �` 6 a / D F- /} „ §{ j - -\ - u ~ 04 , ,, 3 r / ca /( � �� ° /\Q / )) [ [ mƒ} ) )\ , 22a. & LO - • R� cc f§� ) \§ k) \k k« $11 )2 7m qs � § $ § 0 £{ k� 2� 04 E §) fE �E �2 L§ § f ) -> 3 d /)\ m Ln M g /§) tui C2.LN 1 ci $) Ck2 © k \E \� k) R !a ° !� %z 2 `c:) t\ C, 2 % )/ �46 C) LL m co z (QF- t= CD § e aco o ( CR )3 �)$ § $ z F ± D 7q 2 ® F C t ƒ§ 2 § {} m 2 L ) z | 2 �2< u § cl Proposed Conditions IRF �� 330 �vo,.w IRF 335 1-7J 340 / . �l� •�•I � x�IOI)IltrA _ kg 345 / / O r- / 350 PI _ - f, �k r O / , s i .. 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