Loading...
SWPPP FULL BASIC STORMWATER POLLUTION PREVENTION PLAN NARRATIVE NYSDEC GP-015-0-002 Prepared for: Ron Bali New Single Family Residence Tax Map # 295-10-1-31.12 West Mountain Road Town of Queensbury Warren County New York State Prepared by: Hutchins Engineering 169 Haviland Road Queensbury NY 12804 April 13, 2017 Certification Statement To be signed by contractors performing the site construction. 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. Name• Company: Title: Signature: Date: Each Sub-Contractor or additional Contractors completing site work must also sign below: Name• Company: Title: Area of Work&SWPPP Responsibilities: Signature: Date: Name• Company: Title: Area of Work&SWPPP Responsibilities: Signature: Date: TABLE OF CONTENTS 1.0 PROJECT DESCRIPTION ........................................................................................... 1 2.0 EXISTING SITE CONDITIONS .................................................................................... 1 3.0 NYSDEC REQUIREMENTS ........................................................................................ 1 4.0 TOWN OF QUEENSBURY REQUIREMENTS................................................... ........ 1 S.0 ENDANGERED SPECIES ............................................................................................ 2 6.0 ARCHAEOLOGICAL RESOURCES & HISTORIC PLACES ........................................... 2 7.0 CONSTRUCTION PHASE EROSION PRACTICES ........................................................ 2 8.0 TEMPORARY EROSION &SEDIMENT CONTROL MEASURES ................................. 2 9.0 CONTROL OF LITTER, CONSTRUCTION DEBRIS&CONSTRUCTION CHEMICALS ...3 10.0 SEQUENCE OF CONSTRUCTION ................................................................................. 3 11.0 MAINTENANCE OF TEMPORARY EROSION &SEDIMENT CONTROL DEVICES .......4 12.0 OPERATION & MAINTENANCE PLAN ...................................................................... 4 13.0 PERMANENT EROSION CONTROL ..........................,................................................ 4 14.0 INSPECTION REQUIREMENTS .................................................................................. 4 1.0 - Project Description The project consists of the construction of a 3-bedroom single family residence with an attached garage, 800-ft gravel driveway, on-site wastewater system, erosion and sediment controls and associated utilities upon a vacant 7-acre parcel. Site disturbance totals approximately 1.7±-acres and will create approximately 0.38±-acres of new impervious cover. The project site is situated northerly adjacent to 1085 West Mountain Road, which is on the west side of the road, in the town of Queensbury, in Warren County, New York State. Proposed Conditions Summar►►: Total Site Area: 7.02-Acres House: 3415 SF Driveway: 12,585 SF Walks: 105 SF Total Impervious: 16,105 SF 2.0 - Existing Site Conditions Presently, the project site is vacant of any buildings and is moderately wooded with a mixture of medium to large coniferous and deciduous trees and brush. A central portion of the site totaling 1.5-acres has been mostly logged and from previous logging operations, there exists 16,500 of gravel surfaced logging roads. Site slopes generally range from 10-30%, with 15- 20% slopes predominant over the areas of the proposed drive and house. Site soils over the majority of the building portions of the site are mapped as Hinckley Cobbly Sandy loam with Bice very bouldery fine sandy loam and Oakville loamy fine sand located around the easterly and westerly portions of the site. Soil test pits revealed gravelly fine sands over silty fine sands with no seasonal high groundwater evidence as indicated on the soils test logs on the project plans. 3.0 - NYSDEC Requirements In accordance with NYSDEC SPDES requirements for residential stormwater discharges from construction activities under GP-0-015-02, in which land disturbance exceeds 1-acre, but less than 5-acres, a basic SWPPP consisting of erosion and sediment controls must be developed and implemented for the project. Specifically sediment control fence, land grading,topsoiling and revegetating practices will be applied to all land disturbances for the project. In addition, a Notice of Intent must be submitted to DEC and permit coverage must be obtained prior to beginning any land disturbance. Upon total project completion, a Notice of Termination must be filed with DEC. As the town of Queensbury is an MS4 municipalitiy, an MS4 acceptance form must be completed and signed by the stormwater management officer, which will accompany the NOI and NOT filings. 4.0 -- Town_of Queenbury Requirements For residential projects, the Town of Queensbury requires that the 25-year storm event be evaluated in developed vs. existing conditions. Two design points are evaluated, link 1 being 1 runoff from the project site to West Mountain Road and Link 2 being southerly runoff towards an offsite stream. Link 11- - Runoff to West Mountain Road 25-year Existing Conditions: 5.08 CFS/0.310 AF 25-year Developed Conditions: 3.95 CFS/0.197 AF Link 2L - Southerly Runoff 25-year Existing Conditions: 1.03 CFS/0.062 AF 25-year Developed Conditions: 0 CFS/0 AF The results of the HydroCAD calculations realize a rate and runoff volume reduction for the 25-year storm event,thus the Town of Queensbury requirement is met. 5.0 Endangered Species In accordance with Part I.F.4 of GP-015-0-002, the General Permit is not applicable to projects that may have an impact upon endangered species. According to the NYSDEC EAF mapper, the site does not contain any species of animal, or associated habitats, listed by the State or Federal government as threatened or endangered. A copy of the EAF has been added as an appendix to the SWPPP report. 6.0 - Archaeological Resources-and Historic Places In accordance with Part I.F.8 of GP-015-0-002, the General Permit is not applicable to projects that may have impacts upon archaeological and cultural resources. According to the NYSDEC EAF mapper, the project site is situated within an architecturally sensitive area, therefore an inquiry is being made to NYSOPRHP to determine if there will be an impact upon cultural resources. As the site has been previously disturbed by a major weather event and subsequent logging, it is expected that there will be no significant impacts to cultural resources. Once a determination is determined, a copy of the correspondence from NYSOPRHP will be added as an appendix to the SWPPP report. 7.0 - Constrution 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 within disturbance areas where construction phase runoff concentrates. 8.0 - Temporary Erosion & Sediment Control Measures Temporary 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 2 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 14 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 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. 9.0 - 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 be regularly removed from the site and properly and legally disposed of. All petroleum or other 3 hazardous materials shall be stored and handled in conformance with NYSDEC spill prevention and containment requirements. 10.0 - 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 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 dispose of all waste material shall be disposed of in a legal manner. 11.0 - 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. 12.0 - Operation & Maintenance Plan The land owner will be responsible to provide the maintenance in the vegetated swales, cut/fill slopes and vegetated detention areas. Maintenance includes trimming of vegetation and sediment removal in the facilities. Trimming should be performed as needed throughout the spring, summer and fall, typically weekly or semi-weekly. Typically, vegetation height should be maintained between two to four inches in the swales, detention area and surrounding yard areas. If significant erosion occurs due to extreme storm events, the eroded areas shall be immediately corrected by removing the sediment, backfilling, retopsoiling and revegetating of the eroded areas. Erosion control blankets shall be installed over the eroded areas in accordance with the manufacturer's instructions. 13.0 - 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 five days. 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 blankets as specified on the plans. 14.0 - Inspection Requirements In accordance with Part IV of GP-0-15-002, the owner or operator of each construction activity shall have a trained contractor inspect the erosion and sediment control practices 4 within the active work area on a daily basis to ensure that proper maintenance and functionality is realized for the practices. If soil disturbances upon the site have been temporarily suspended and proper stabilization methods have been implemented, the trained contractor may suspend inspections until site work is restarted. In addition, a qualified inspector (Licensed Professional Engineer, CPESC or Registered Landscape Architect; or someone working under their direct supervision who has received four hours of DEC endorsed training) shall conduct site inspections at least once every (7) calendar days. If soil disturbances upon the site have been temporarily suspended and proper stabilization methods have been implemented, the qualified inspector shall conduct site inspections at least once every(30) calendar days. These site inspections shall continue until the project is completed, final site stabilization is achieved and a Notice of Termination is filed with DEC. Attachments • Location Map • Soils Mapping Report ■ NYSDEC EAF Mapper • Draft Notice of Intent • Draft MS4 Acceptance Form 5 tj CL 7, a - Q ci ca LU z Jp i �� ��• �� •�����.`+ � 4 ���. �' ,� �� •` a S.� A� v �� �� � �'.,• �r i'rl' .111' w-. i+•t L' +Yjf. .' � 1 L' i EAF Mapper Summary Report Wednesday,April 12, 2017 4:11 PM Disclaimer: The EAF Mapper is a screening tool intended to assist project sponsors and reviewing agencies in preparing an environmental assessment Form(EAF) Not all questions asked in the EAF are answered by the EAF Mapper Additional information on any EAF question can be obtained by consulting the EAF Workbooks Although the EAF Mapper provides the most up-to-date digital data available to DEC,you may also need to contact local or other data sources in order to obtain data not provided by the Mapper Digital data is not a substitute for agency determinations 4hc Ja€quel��e - , Z7 Ei .rlI.rr..+ M_,ntre:.'• v Fensbu7j b lar ou t r, t1rin;t. Itor.Ymstrx i N AjbmV. n� Folt r. 86611101 Soirces:Esri,HERE,DeLcrme,USGS, CEevdlgtd d Prwldetce n Intermap, INCREMENT P,NRCan, Esri + r-,+..a_, ,,� Japan.METI,EsriChina{Hong Kong),Esri i-,•, plttahurgh 5ourceS11'ri,ME. Korea,Esri{Thailand),Mapmylndia,NGCC, Cdumbus, n DeLt c[IISCz9,Intermap, OpenStreetMap contributors,and the GIS r' INCREMENT P.NRCan,Esri dY Us Er Community rclmr ETI,Esri China{Hong Part 1 /Question 7 [Critical Environmental No Area] Part 1 /Question 12a [National Register of No Historic Places] Part 1 /Question 12b [Archeological Sites] Yes Part 1 /Question 13a [Wetlands or Other No Regulated Waterbodies] Part 1 /Question 15 [Threatened or No Endangered Animal] Part 1 /Question 16 [100 Year Flood Plain] Digital mapping data are not available or are incomplete. Refer to EAF Workbook. Part 1 /Question 20 [Remediation Site] No Short Environmental Assessment Form - EAF Mapper Summary Report 1 N O U C N r W m G O .1 N -00� x I iii N . Y -rl Y G O N 0 111� O A 1 ~ 0 'O0 Y.0 U N 1 U N Y O l I O JI y P H U 0,U O O —f N Y I11 C �' N rtl .0 N 3 G Nrl N fro L' NG yNj C O N N 0 H 1,a1 p.N O A C - m A x rl ro ro C m N E 0/ U O C O y O — C C` C z H Y C'O Y H 2 U U N ro� OoC C. O m H N Y a GiQ >,c va �I m oA rl Y Y U W FI � o vi N a 0 O H S4 Y N N N u '0 7 H U O�O Y — I u m u > m M fIII NI— ro W m ai w )O U Q b f a v u ai s, u m o C o N a, N N o v a m a a O V 041 ! u m > vvNm C m N v -H W >'1 m U E E� O b 0 b W m 'Waoi e.,•TGU[HWf]]l ••«�HpH1.a My'� �or1i 1 'aUOrobNNC.i oro p waO H P1d0]' wuaNUNvm' ••mF.r' L>eH� U•vPD0 Ao o N N OO $ 8G�0 O 41 A- .03 W O R 0.. I0ro ` a°� NH� o o NoMi v 0u v u 0 n4'L) I ro av Z OaOw um b o M a Z yl H .0 O a G b N N Y Y 0 00 o a N Y O m v >I N ° H .°� al v °o o a o n a ' 1fz N x:alr eni zroilnl O 0 .a O'trj'' 01 O m I '1 N 'X 3 w W O Y'd m LyyLs� �..� y �' N 1 a o °o v r°I a NI —1 'r061; y N O.0 A N N m I � >,o Y A I N O 0 ,V n F{ C vE-�av O bypm G v rn.vczA - rlroYmm -- Y! a > o Y m C •H a° ° �c1I V U 0 � cn aI N O Y Y Y - C O W•� o�o A w E-1 E 0 o W E U N CL W O 71 O mvo W 0 V 1L N W 60, k Q aQLHl O H C o - 1 W �uil ---� - i weO P1 ° " p 0C ` y C O O C o a.°>+ N. bba � !y 9 o a H Z t m o o m°ro w H O a y- f•1 CL d N C U roga�i - N � I w O\ .. - �.. a m Ll — - .ami C qC a 10 W O 1> —.1 v r 4.1WH � H mz _� s R rl d u Y w it C3 .1 O M N Q G CC A � �' ptWO .� rov — O x El NA Fi a0i� .� m� � f z D: ro� 0 P r. ] Y b ro 1 N i4 .� 0 y 11 Q { N 0. O b1 P I m Z $4 QCT tEi rio 0 0 — 0 3V4JI va E :rt o 1 � - o c t~ 7dYroNv -- io rpt v a v-01 a u tw v v - .. 1• L ul M� v aro J a o a o i '' wLzJ 114H�� LOU f v z° 3 N W , W .w{ O I m m m m m c a) - sa H — ro U ro w Jl 3 A A u b b N Y 1 Y O C b N N 0 }�� 04 x a ❑ ❑ O I v � m i u o r• U , , v 10 11 a, 0 i m H 1 mI C b b rl N a aY' N ° y' m •A N I �a v G.0 OH N-H0 U) m 0 O 0 44 O O I Y N W r)(n A (n O O N G qq .i b Y-rl W v P.' m 4 vi 13 ro u) A C 0 'a ro o 7 7v°)W Co m al Y c o ,C N b v rr Y .c u ° a) u .— r m 14 p C rn C O w° b 3❑A 3 U a) w O O -'I --O v ry Y v O .�--.�. ,n v W C W ro G N -.i TJ•C Y ,Y .F . 0 0 0 0 v w o o'd -.>i ro Y —I .o 0 N W C G -N -N x ` G f b w G Ul a U H O O Y Y >�.'1 .rl N C U ll O 10 A a) f-4 N N Y 1 0 '� m ° v a v vc ous ro Y ro b b O al 11 N Y -.1 m .•i O rn f ro 0. O 3:3 .J U 7 W b 11 N h Fj N W 3 C rl I O YI 7 O b �yi 1 b c 1 ,-> C Y C y� ` ° h 5 1H G W Y -H C7 N m Y > ro m U ro ro — A ro N O O .rl to u U Y u U Y Y U) N •rl N.1 N v N a) a) to ,tl C v W U 'aG a) m Y v N x X v W W a) O N-fl O a ro 11 0 0 w o U U b N 3 N a) N v N Y O O — G b U O O 1H b A a N 3 rn 11 W I-I A W v 3 'U rn� v v W m b' W O 9 a 'O D O O c W H — Y'U A C .0 m N O Y m F�• ro ro m u u O O r~ — rn rn '� a a) a) a) N v a) ro 0 N a UI N ro w O a)"d 44 H E Y Y Y Y u N > > x x A .0 -1 ro A C:m E y' H ro 3 H ❑ N H.rl 3 N ro Y Y a4 4 O O O z �� Y a m m z z S, N N .1 m J • O C b+ C7 a, O I m m N , V pp m m \ -rl R m Z 3 W O F N � � 10 ❑�O I 1 O y Y O� Q Y N t7 a' E rl w N i"-1 7 N O\° Q ul N C aJ m W ❑ H W O H b 0 ❑ H q N m z q x c4 3 w E b .H W a O q W U O 7 0'i U N O it y x to q M W a a H FC 11 ai 7 -.Ci Y p v u: C F°ro 4 o � a o V Z Ha a o H E a o ff HE vpowO y U H m )- a U LO H `i U Z Y COO LFCW — N L Q, HY > � j 1l7 z H bH q M W W � O 0 W H3 wQ 2 U4 O ] 2 2 OD O ] W F m >1r4 W O4 -] V O u 0 0 0 0 0 0 O O O O O O O O O O C w ti o ° ° ° 0 m° ypp 4 4 a a) o row ro.0 y H w tll M .0 7 G O v N C •C y i— ' � � � �.• —� R-1 m ° ° rIY a) '0Y W tUa I N�oo b P A + CNA O m t0 m J a W ° m > 14 a rn C� G u Fa a G o G f� X: U o\° C Y ro of v ° a H a m+j0a)u y� v v I ° Y w m H H a [ H Y N 7Y a) rl l Y U O rn v U tl W'O Ll A { v ro H C.b w q E W O H .,� ,C a) m cId M xmmni g'd 2 O W q U O b Y O m•C O F Y C u)'41 A Rd C. FG' q 'x U ❑ rn U W i-7 A N C Y L4 - y N a c 0 0 o m a �z E w w r — Y a o •� b W rl•l >, >, U] L4 l H 'H -.1 .,{ J b S4 b N ul O z m 2 a a a W ry' >, a rG E 3 rl > c u 0 > b w C4 N Z ry FC H a H 3 ro iti ro ro 1 a o\° ro W e a q 11 O 1 a 3 Z � H O N Y N W 1 a N Q'.1 O W W H H H 'S O S U E i-] rn a H m i_ a) 1 .0 •H a/ N I 11 H W w E F (D H C YO r.,0 yl C A w ry' O D [4 U H H r.[; V w N b - m Y O H'•I E !4 W W x W H E W 5 M H - 'O N N'+7 y N h •H b m+' N a x In D H a a H H a) w w a — 'o rn.�l O1 Y N W W F F [7 (� Z H H ❑ ❑ C4 W W x w O Y c Y A Y O Y O Y U U C4 U .] H Z 3 .7 M g 0 a U H Z [4 x.— y.a U ...I .+ 14 ro .—_ ..� _1 v W O c(; D O b H H O O w H /S H U N Y > c ' 4 O U .0 31 a) > 0 rl rl w W U U H U f4 f4 CA i-] °+ O-. .. b a) N .1 Y O a .N Y a) v ovi m 0 0 0 0r-, O uH v v m z W m o O N FT . -� - - - i—E ° � O Hmv� lo� C N i� _ -;, U O a az °U C) _ w N U M N .1 a w 1 C a � c•Oro aali H o o v .0 1 W v C N N a U >Iv v a U W v u a a � 1) J O 44 1)!�..i W U-U W o , O 3 v — airoro ° o wa � m C7 I •I z .a b+� c a, � C o N N o -^ o u r7 Havv.� W it o rod j o u v y a o t�, II z 7 ao vii 'w W I— M 3-�ci >Q _ oabiairooi NHti F f H 7 N > 4 N O . p tf — r o � a.cU Ni a q R ��E' �I pC p rovaf= Cv H. . N b) U 0 W W ri;' �. W W A w x o H w u G w u - a R 1 J u] -H T U . G N Pa IE J W rtl N H O 3 b M4 4j b 0 r" IM 'a id' 1 'I. I y it�o N" > z'..� z E- u o 3 'd H `)� z °, fpJ• o if1 M U o u ro a3i u.. O O N b Wp, _I ..� U v rl H z ro m O N 'a •A H b ani 01i O I D M H N w r a� 4 N sr 3 N. N AT0000� w �". 4 x 61 v N m H H W .1 ;r, U x r 2 ry I.�.-� V -� v a a ro w E O •.i b� H v 41 'J.. �s V V Wri: a vii am' v b o �• E., F-, �, `a o L4 CY w' - N I z x z z z z 3 .. � �7 41 w H N N I N H I H o !1 0 r ■ m d N W u o m y'U z v G o l ro C t+m U G v as °w o ° G T v H H 'o N v N m c z c .I C m N v m ro v v 1) v rl 1) U o a v N m m U 3 — w O v v o G v o a y m O L .i H v Q a v 6 O W d H.G v.q W m rd roN oN-o 0 3 u m _ m l� .G rl ro 3 Ul N 1 v C 'o O ro v o v b I a s -U a O b it 3 T H u T C rl N,C C v v v V v rl m u 7 0 N W m C tr v W W .i 3 a J� -.i ' rd U O O d) U N N v o.G G O O G G m v N N ,G w o -1-1 N 1 it-- v 3 m b+ro 1) G '° W 3 m H U U m f W w m T m a v U Co a a a0 H o'. of m W •— N m r is a v v H CT H'o a v W rl d H -•1 v G'° G C U W 0)11 v U'OI 1 G m W m m .-I l� m C v Ho C H m a I m m o a a c m C ro 1) v v 4 v M a v v m > AiL) N v O O E TW.0ro N .i A v +) O U 11 W W U W U N N U v N rrl J�fZ O .iI O N O-N v U C C CI v a- cd m'° to H v 1�a U .+.-+ m m O O O!L N b v ,vro rna Too r-•+ v u A O N v G J� ro u m O O v G N v .0 rn .i rl a O C m v v-.1 N v'° ,C W -.1 N 'O -•1 rl r1 U C.0 o u v WH W ° H 3 �-i[`. H v N N O H b v O O N v W w O+� C G] a u U U U v a.H +) 1) G b• W 3 O Y m C ro O v C b r C 11 m G v 7 G v v z T v •+rl-- -°•� a�. N a v rl m C v to 'U a v o w-� G o v O v m v V H > .� m u o N p o A G v a U C o'O 7.0 v N v 1 v'o o C G a 1 C 1 ro V M 11 G m W a m v N v a'° G O o-I E G w a -.1 U v v G G v O > N O °' m PO U o O a m a H O 3 v G +i U U•H O a H A I a M m +� N v N v u1 ro x a s v v m T 'O C v'U a v T W w w O .0 Jm C O a b v v 1111 H M �l� U+� v m N w E s4 •� ro v w v -H.� M .I > E .G mal +� I�.+ - w v C 3 N O W 1�a b a J�l� O .0 v 1 H v a e ro m a U C,7. J� N v m ro w v w o a u o nam v a ro ro m o O T a C T O m .,� v m y y a br ro 3 1) m 0 3 N a W ro w w M cam u 3 m cam 3b Mw M m� xwm-- gwaaH xow 0 a ui L - - I L� M ti Y•I i N N N -1 1 r W 0 O C .c G r ro � D O +� a w 0 > N C D ro'O o'J w n I.c N N m C N N a N 'DU o b .A ✓ 1 o w. 1 N y .Ci y C O W 7. N a W o m m U ro a) N >> o o .G lT.� w w a m .moi v m w m o w +�.1+� C CL 7 y N C G N '�•yi A w V a C y U O N w N uo 'o o I O G o > y x: o G rAa o w N a/ A� U U O U O a U l 7 m m 0 p N .,a mH aa) N aroim � 3 w W al 0' w o o .yi U b1 m D N o u.,{ > C y N o w u H v m m.,a w u row-,a r N 7 G c bQ t4 U N .y o U N N N o C N, y y y� C a) z al N 7 a a O w w m H o p O a ro b ro N W N D b y N a a N N W U O N C N a b m q m w U O N!� .G C a W ro a rl W 0 0 .H p " W N w C O OI C H ..i G9N ri J� ✓ U o C p O1 3 o rl 3 0 > w a) C H w 1 4.) m N y +� . p .1 N N N a)C R, O m w •C > N y -`i m a y 1".1 N W rl al FC N U O D H a) u S] a ro N y aJ N m FN. a O U N Fes' o o--I o v ro `"° o a G .�'.' o G rl b�> b' w 1) -N w y m 0 i�r1 U N .� ..i ro N I J� N U d N N O w •tl m v) roA bD y.G m W O > N3 a w w o N m= a ro w N D > a) > o W N o U m O q " b [9 w O -.Ci�o N H N U " 4 '.' a'J y OI v y y al C D ro-�o O ti A-'� -rl a C7 w ro W U 3 tl U ri ri ro ro N a N y a m l O N o a) of a y rl w G.an W N q > o n o O x C d w w N N W D C G u m a N C o y w Im w W C "i C U O " a),-i N N N 44 0 N q ai O 3 a) a).G 7a+� w w -•i >-o .10 U a o q O W ro a w •H q O v.,a m y +� a w c a '� q q Hb y q q ,a N N a� o .� ro p N r a N A •+ v +� a.G U •� a v Q N 9 q O O u q q W u m.,� 3 >. u ..a +) w a O •.� .� u •.i O ro N a G I o ro b v c a H v v o U •. O u W W H O A Y v q N .� W� ro U' y ro rl U ti rl w +� J� CT U ro A � N a) {I 0 0 u .a a) U U b a o a) N ro N q '� w A) U C D N N o O� C .�{ 7. .,i I N N o N a m q y O q q 4r > q b ro a O q 'G-'� a) N b rn C O N [L u N W E o D y N w O O O w b w w O b u G A G ro w .� W.� y > y ro c v v q '� Q w Ofi N U W w "i m o N O N U✓ a w � a) w OI D N M 0 >D N O H ,�w y a) 0 a ro a '� 7.N D..� .� m w oG .0 3 -H a c U 0 C U O N a to 4 O dt X .M m bt 3 C y w V a) 7 b�.,i o `yp .� q >� .i a1 i 0 b v " ro ro +� O'o x a," > o U >•>� N 1) ..1 b b w .7 q W N .1 N U w- N •i >.D b N a m �„� W ro w w o N � $ w b b d +' w > D o m GG o v m w N+� a O'A r N D o m y g ro ro w > i .i x ro " u a N G D # ro o I.H a) a) N a +� r w w b U b b •H H .i N U '� rl y >D ro '•'�-1 ..I +�D E C N •• N y C C N N w O O .N N q p y 'a 7'� -� a) O pl>,.0 > m mro a a a a N m Q U PO a Dtr�o ax u3x+� oG N• f v rov muGv 4.1 a D rl H a)N N I 0 1 D A�,C ri a) o N O O w� G _ G �' _ -, N-- �, a w E.I� ri m+� r.0+� u ro x w A m N ro r I N N N N m z al m V Na I m p d q 'AO H O y VN x w Y o O .1 >� U q U u U 4J H q N X o o q w o A b o ro H u 3 a o a+ w 0 a > N Q w u N N u o u w uro w ro u w w a, m u o u N y� ro 3 b ww a N O v bi N N w H N b b ./ n1 .1 .1 a N W q , w > ro a 3 q a 3 w ro w a to +, > ..7 .i N f0 m 11 -H .� q N o 3 a N i N 1 m tP q X bt b, q w4J 4j S .1 w q O w ro w b b N -H H p M O N Id ro A .� 0 m N N E u N '0 q N Y b) b' m a1 H N .� m N U W .� U) w o ro g q N ro m m c9 q a �+ ro p w x m ,q w w .I 3 O o 1) "� N ,� b N N d .b H X w w u m w m O U N 'b 'O b w a m w N N w C ro N m rA o u w b N N > '164 q q > > N a u N m P. Q W OwG N y W N H N a Q Q ED 'd a 'd W 70 a a )1 a o w N G 41 C o u N U r O w q w C Ew id U m P4 D D ° b o 0 w O Y N N '0 y nl o+) O U y U y D •• � .�i N o b > r u ro +� 14 .1 q o Q w o'CO . o x 3 b 1 w o U u u w F u a w G N O N O N 1� u, O, v o 4.1 b m q yqy V w Q mo 'gtlg .i O 4) 14 v a a N w of fi q m q q w w 4i .v b b) X N .1 .I a O H .i U 0 m H V q q .a Q b m nl U w U N S q O O 14Q w nl N a) m E w 'b d1 g P U X N N a U w w o Aw OG 11 N U q .1 a a) 0 w L N q N N b N FI 11 N N U q y rl o O Q Z O Q m 1) .i H � q q w H Q m (d N N A U „� U w m Q W w W I \ N N N H o w nl D X A J4" rl EI Itl y 9 3 O O O .1 N m y N I U U a) d q o H H a H FOi H N N O N� 41 ro 0 o E'' .0 o q d w w H 0 0 w w -H 4J u N p ro — u v E U U Q N A a a a 9 m m m m m m H F E+ H 3 m ro u w E O i ! • C, -. _ G C) -. v 0"l N f ro — 0 v v 0 v 0 — I—J v0 - ,0 C G v rl rl > O) W W U W U w z N • w W 4i H ai O v m u v W-.1 A•.� II 11 0 I o rJ m o w 4rl w F7 O b O .-I .-I 7 O C O"o a' W W ut .1 N U b m C O F a 11 rulo a opo a n rr I rr ou wU ro Wo +� 0M0G up N'• G Wn .,� a waw-.a O V C 10 G W H O U -' f1 O O O a W n R U C 1 x O > O $ v-Hq{: N 00 bI Gm xo� a c orobroW aw C4 av G _ � ua) uI W o 41 1•I > a •1 O N ,1 w a+ - v o s1 w J u ,ti s1 W w-.1 w N bW o W U U1 11 0 W u W W ro-1 w W H H 11 11 aac Q 1� c ro m .1 Ul W W a w W v o ro v I W m v aU a :r a - H 7.W � N O 1W W b ro q 4W1 o W ww .. Om G O — bm o vas o s1 o v rd^roa ,u N T` u b .� m .a o m b O W . .0 U Y ik a IA W a V C > W C'O .i N > O R W 0.i W ., -O O yk O W W I .c w -o N m s1-�--H s1 (d u 3m 3 RU 1 v^ m N I Wm m Rw +1.1 ,L,• W 011U > 'O II ro_N rl > > -•1 N q a ua c >a O a 11-0 b > a U-.I N-H v .N W o— .14 0 v W ■ o 10 -H ra r .1 r » w W Wm N O W $4'o11'.i E~ S1 w N W 11 R•1 �-.i W w m Ii R f1 V a m — tOi oo ro N .1 - > v W o' I > a W v W v 2:a I o,m aN C o a N ,�pFW>w, 'oCStlr ,a-ro'a1I N.0Ww.{•-- GWNW�.�mSTL�' Zb a—WGa N+C� Vap! Wt•1 yWui ti4U}roJ. ayaro �,�� FW�gU' WW - 'cEWd aa .wwUUW)& wooo.wUUW1 ao rW O W $ W o ro u u!.tlo1GA1 aa•�•H e- N a oawwWo > 0 0 b o , o H C1 E Wud- 'a3VWWWl ro EW U• > Wrwl u O ro w roUv .1 y A � WO1RRo3OWW G > x �mx Ual Id w W •dW > m o . 0.H o d b a1 b v 0"i w C4 �g i-Gi� H0 H H a I vx H H PCU r w 3 0 b a > N o a m W N S1 � O J 1 Wb W 14 411 N 0 Id 11 1 — IV, 0 41 -1 WH U -w.r.-Ill H — N w w w w H O O O O - U'IbQI ro W ro U H $4 0 W A �hjwJ Id Id ON,pFa NAL W W b K' N (dV I d .1 - a 44 w I b ro a s a w W O u N m 006 O : .. Y vii OOi '^ W 11 b IUJ (a P4 w Q 11 W A a wWV N H 11H A N W H W ro 11+1 W PI w w p0 > U d a1 ; b p 41 W W • IwWa: a d bo a q •.1 .�I u1 pW7 W W Y L' O 41 M 41 V 1 v .-I 'd W O 00 00) I 4 Id 44 W N WO 93 S4 w Id W G W W w 0 q U) mH V N 17 ON 0 a 0 I a O m I 10 a 10 A A 'rr,RWdCl NO 0 prl w w . a 0 .0H 'd0 aW 0 'd 0 ' 0H 41 W 0 Ay w v 'd 4j -0 N � � aN W a O a 41 � yl W W .-I C. O W W N W ro O� ro W Wp W H F1 H a O ro ro H O p .i O b W W a O W b 11 $ .1 °D H W w a q T A ro 1209 ro a w w .1 w W ro O q a1 H W w y1 U s W W ro ro U' IA W qq a a W b 1 a a O )4 a 1� d bI W C1 0 d a1 a .0 w W W W U .i W q F1 G O N b H1 00 w w b H °i w 'N x W d H 10 Hi d v aWg w o U O .0 4 w .WI t .1 0 .1 O w w C rj G O �I w d +I V .i U w ro w bI ro N 0 U V 41 W W 0 7 q W w ,C X 0 0 W W u w w H Q W > w a c� H H a ] oa a 3 a w .� a o w w a a 3 H n U H _ m _ O J C m w w I o _ 0 o 0 -H a ro m I o N W Y O v � m a 0 0 ro C N O U ron,w I W ti A m 0-H N N N OY > I .0 A A N U) -H a Y p. 1-I m N— mH S a I OH� CO Y O a wa) -H a) w ro v H a mH� ° ��a v a Hu Nva Q m Y M H m N W O H v am 0 C v -w110 a .N.1 A 40.1 Y0Y Y N m N HZ al H m C 14 O Y N b a -H 0 O W 7 0 a w >ovv v i 4 $440 q H H > H 'O H p' Y W Y ro m My ❑ I4 > iH H m al ro ppro. ro oH , cY aC zb0Y r >. m O H+O v 0 0 m q10wNm 1 1 Ao o m o , H mi m Y 04 F! m U o >.N -P a,b v U Y ro .� wi'� H v.r q �w u o c c V (d 0 0 O I .10 Y Ym m 10 H 11 0 O C m U Nm C 0 0 m I)H N ro O V q m N > H m m m m m > O H x a s H O r.04 G w H ) H f•1 � C H W r 0 m O ) W C m n H U0 a) tl H > a) O a) -YI U x y1 O b A A. -rwi b U a b N sHa 11 G J q R.c4 - m m v v Y m 17 v a W p _" rn 69 o a -H �3 v O a) Y rWaYaaroil--b.0i i,Gaa�ro roHWH vHai qm.,am N3a>m Y amHaa m0ro roa�NH� �.a0 o1O>1f 'v �•11111 -Aproa.i) m m aO -ami1 mCmHH oU >0A m a -rn Aby A k"' v v H y, pam vm -d m o a) m YyC HWaYyO W'4@@Om�1 O 10 0Un O V > m 1° > Yw u a. CL W O -0 H � � > a L1 U L N 1N > O U Ca > T10 tl H 0, O Y H A .—_•.. 101 W C41 rl 'a H ro a y .pi r.A�l.YCH N YCm wC •aY m O H . QUO �u v W U7 p 41-H a q Y 1 O vro 4JNpmu W u mCv va O O Id m q bH ro C a� v m u > U �y C v-O N b [�A u aa' aN a)N m o >i Oa, U 0 0404 U m G u; H H v a off m Y Y-i v O o H r1 H o a AW CL U N-+H) 1j [i m -H ro 0 M m A IT U > ro d W H v J� U -U a W WF N 04 0 7 a N H M IN Y G a 1(�p {� p g gtl >1 Y v H 'o o.s 3 m P, H !-a M A N N aHi N 0 •HH 0 41 N .-Oi a fx a) U C > C O W ro a H a H C.� ..yH{ Amy 11 N H [..�H ,ib m 7 3 m a) H N ... a)41 m p>w 0 "10 .0 3 y� W'O 1A-)W x .1i) ry 0 U..[J w x P4 ro iWl�{ U Y �v '� v �o w o m m O A E A ro H1 C N 0 Y 7 f a IA O'U ,4'Jam-) �H{�I m 0 > ro �4 Id O � A m N a) A v ro -H U .Q O b' H q�,7{� , � a) Y TTP O({yy +�H p1 > U+' r H H E+ a U y .1 N p H•d m-H W N tl b)0." Y . V H -.1-.i .�A > W W > OY Baf/1 0.aw Yt+ � aHi �� .0° > ,mH m V ro O ymi j 0 0 b a) H U 0 v > > oa m v-H m > o � asv g A0 � ymv1° � m W N 31 P.A Jm-1 W N v 3 Pa m > m - m y a N 0 P'.41 a) W H VH m o � v > oa v-- m as v '0 rI H 3 Sr ro m o .H.H a) C H U NAY y al N D N -- H > > q > a) p OH I H+� 1� '& H-H- .i W 0 I .0 m �k W W H H v H al m F w m � I m m L m m I m m I RAA ..H I ea w9yy yy 1 iT ry E N Fi 4 4ID!.yy"+yryMyry 666 ��' ppR'Rg��R 4y4yY Rp�,�,11�4.4 �S1 y 0 n � w a �Mr nw iia0 Y f4. /J 4 co � YeNu►..N�'n M R: N RI L J A, 1py DC N IN u yJ W q N•J w 1 �j R: tp >u❑ w a1:.z J u ❑. o c ro ti . P Cap m a m ''C w '0 00 m❑ +� Id C ,y P.N ❑11 0 E� 'W W W Nw D 3 w N W ❑ 4•�C p6, N .4 c y :D u a]V O$gpp lµ b ... 0 m ❑ M v p •Fi H N w ❑ m W w 0 — � y p❑ 0441.' 1. � v uu ,w 19 z` SKy�S 7 q � � � �'❑ yl�P % R 0.' d I tl�r� an,�� ►Diww i4 U +❑I G. ' b tl Fd7 O i.1 h N.n U P Y lti u uryy ti I k titi mH aws .I Q L +1 do u 34 d 14 • •,4 Q u 4 s 0�tl �-.U•! 4 -H ❑ W U a� N s.7 C' 61 G❑ U la In dw 10 C v N qluq, ky C CI N ❑ i, N a16 : to [-�-. e'�7. u cui a %C3 m m.y ..r O 3 '[Y d •i'i T U to D ❑❑ N I� O w�� W.bi +n•..r, a V o. ow 7 W m N C W d m u 0.. d W d d SI m -i .O• p O�v S n D a w ri : H 3 A H ^J d '3 i+ d 0 m w � n W N D N 0 ti r-7 ❑ d W N ro N g d n A.M O.O W ;p' d^oI M u t•. •D H M10 w N f. C �� ,d C 7 w 3a F❑ - Y1•. R1 F: W IT H N "� Q N 111 W m d L C N •4/r ❑ F: V b•.1 m rJ d u b 1a # ? 1/ N d 17 w Yy b C7 F G 0 d C..•$ .+ N 7 „ fA L ❑ 19.w y, i1.'0 V,c. ++EW•.1 m E1❑ .� [) x .-1 x W $ S N W N $ N 7+1 N Q x O! W % d N 7 N C] jJ 11 p N H Fa M Z 61 Hi]ly w 14 4 M § &§% [{ 0cnWAR � er ` .t cm 16 \ & 2E2,#E E! E ® § � CL ST a «;! (°k( mk 0 - 7- FL kg|! [ kB%0I§ . G3.,4 \goca ƒ. --k= EE 2fCL 2§ ; ,6r a. k LL ; ` ■ �|? ELL e § a,= .= o a 92 § (D 0 _ ! )a)0 -.Z [ { § § � .2 ID - w IL 2E U) co § IL # ® ���� `� CO A2 \ fk S..D- 0k ] :CM o kƒ {`®( §3 ` L § a ; s >o §k$)Mf | § r 7 > \ k a { k § CL IL ! 2 �k -0 § a �7 o2 k IL2� k aE © �� e k [ � 0_ ok \ c kj Mf & `2M 2 '£ � � > 0 E o =f 0 14c w u r_ e4. 0 >. c [ a ' § ,>- 1oak | @ § i 2.2 ! ■ � Jk A i %zzz �R w _ 4 ■§§ ��2 § £ p ; ; f _ 2 ; a 2 ƒ f z!% § §2 ■£ m . § § ; e | ` s ! k k § k § k t 10 § ] K Q § § CL IL - _ § u z § ■ 0 2 w ) 0 ° ) 2 ; § k § k k > ; � § § \ r | § a § a 5 cu K k k f k ( A / k \ ! m ( f ( ( E 2 2L ' 2 ® - a ] : E # a B % 3 m § I ] G§ 2 " 2 ( 0 R - 7 ) � { • U) §o ; 0 ` ■ , - 3 2 k ! _ a f , § °. ` 2 \ ) ru § $ I % q j | 3 , | / / k . J G i \ k r 2 , 3 e O w w a + . � ( w § 06 � k + £ § § y = @ G O f O 4 vl � x .rs•&r s o ,�n I I' �z Pp r 0 z� In` 2za H s = A ry N � � 4� ryryh 15 2S MAIN POR ION OF MAIN POR ON OF SIT SITE 1L 2L RUNOFF TO WEST SOUTHERLY RUNOFF MTN RD Drainage Diagram for EXISTING CONDITIONS 0-50-1 Resch Link Prepared by HUTCHINS ENGINEERING, Printed 4/17/2017 HydroCAD®9 10 s/n 02373 ©2010 HydroCAD Software Solutions LLC EXISTING CONDITIONS Prepared by HUTCHINS ENGINEERING Printed 4/17/2017 HydroCADCJ 9 10 sm 02373 ®2010 HydroCAD Software Solutions LLC Page 2 Area Listing(all nodes) Area CN Description (acres) (subcatchment-numbers) 3 666 60 Woods,Fair,HSG B (1 S,2S) 0.379 85 Gravel roads,HSG B (1S) 4.045 TOTAL AREA EXISTING CONDITIONS Type 1124-hr 25-YR Rainfall=4.40" Prepared by HUTCHINS ENGINEERING Printed 4/17/2017 HydroCAD0 9.10 stn 02373 @2010 HydroCAD Software Solutions LLC Page 3 Time span=0.00-24.00 hrs,dt=0.05 hrs,481 points Runoff by SCS TR-20 method,UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S:MAIN PORTION OF SITE Runoff Area=142,255 sf 0 00%Impervious Runoff Depth>1 14" Flow Length=550' Slope=0 2200T Tc=11 3 min CN=63 Runoff=5.08 cis 0 310 of Subcatchment 2S:MAIN PORTION OF SITE Runoff Area=33,925 sf 0.00%Impervious Runoff Depth>0.96" Flow Length=335' Tc=9 9 min CN=60 Runoff=1 03 cfs 0 062 of Link 1L:RUNOFF TO WEST MTN RD Inflow=5.08 cfs 0 310 of Primary=5 08 cfs 0.310 of Link 2L:SOUTHERLY RUNOFF Inflow=1.03 cfs 0.062 of Primary=1.03 cfs 0.062 of Total Runoff Area=4.045 ac Runoff Volume=0.373 of Average Runoff Depth=1.11" 100.00%Pervious=4.045 ac 0.00%Impervious=0.000 ac EXISTING CONDITIONS Type 1124-hr 25-YR Rainfall=4.40" Prepared by HUTCHINS ENGINEERING Printed 4/17/2017 HydroCAD®9.10 stn 02373 @2010 HydmCAD Software Solutions LLC Page 4 Summary for Subcatchment 1S:MAIN PORTION OF SITE Runoff = 5.08 cis @ 12.05 hrs, Volume= 0.310 af, Depth> 1.14" Runoff by SCS TR-20 method,UH=SCS,Time Span=0.00-24.00 hrs,dt=0.05 hrs Type II 24-hr 25-YR Rainfall=4.40" Area fLfi CN Descrintinn 16,500 85 Gravel roads,HSG B 125,755 60 Woods,Fair,HSG 8 _ 142,255 63 Weighted Average 142,255 100.00%Pervious Area Tc Length Slope Velocity Capacity Description _(min) _(feet) (ft/ft) (f/sec) (cfs) 7.9 75 0.2200 016 Sheet Flow, Woods:Light underbrush n=0.400 P2=2.20" 3.4 475 0.2200 2.35 Shallow Concentrated Flow, Woodland Kv=5.0 f s 11.3 550 Total Summary for Subcatchment 2S:MAIN PORTION OF SITE Runoff = 1.03 cfs @ 12.03 hrs, Volume= 0.062 af, Depth> 0.96" Runoff by SCS TR-20 method,UH=SCS,Time Span=0.00-24.00 hrs,dt=0.05 hrs Type II 24-hr 25-YR Rainfall=4.40" Area(sf) CN Description 33,925 60 Woods,Fair,HSG B 33,925 100.00%Pervious Area EXISTING CONDITIONS Type 1124-hr 25-YR Rainfall=4.40" Prepared by HUTCHINS ENGINEERING Printed 4/17/2017 HydroCADG3 9-10 sln 02373 0 2010 HydroCAD Software Solutions LLC Pace 5 Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ftlsec) (cfs 7.5 75 0.2500 0.17 Sheet Flow, Woods:Light underbrush n=0.400 P2=2.20" 0.9 150 0.3000 2.74 Shallow Concentrated Flow, Woodland Kv-5.0 fps 1.5 110 0.0600 1.22 Shallow Concentrated Flow, Woodland Kir-5-0 fps _ 9.9 335 Total Summary for Link 1 L:RUNOFF TO WEST MTN RD Inflow Area= 3.266 ac, 0.00%Impervious, Inflow Depth> 1.14" for 25-YR event Inflow = 5.08 cfs @ 12.05 hrs, Volume= 0.310 of Primary = 5.08 cfs @ 12.05 hrs, Volume= 0.310 of, Men=0%, Lag=0.0 min Primary outflow=Inflow,Time Span=0.00-24.00 hrs,dt=0.05 hrs Summary for Link 2L:SOUTHERLY RUNOFF Inflow Area= 0.779 ac, 0.00%Impervious, Inflow Depth> 0.96" for 25-YR event Inflow = 1.03 cfs @ 12.03 hrs, Volume= 0.062 of Primary = 1.03 cfs @ 12.03 hrs, Volume= 0.062 of, Atten=0%, Lag=0.0 min Primary outflow=Inflow,Time Span=0.00-24.00 hrs,dt=0.05 hrs ■ i Tt �. 2S 3S 4S LOWER ID PORTION MIDDLE PORTIO OF F DRIVE SOUTHER Y PORTION DRIVE OF SITE 01S 5P 4P NORTHER L PORTION OF SI RYWELLS BERME DETENTION AREA 1L 2L i RUNOFF TO WEST SOUTHERLY RUNOFF MTN RD Drainage Diagram for PROPOSED CONDITIONS Sut>cat Reach on Link Prepared by HUTCHINS ENGINEERING, Printed 4/17/2017 FydroCAD@ 10 s/n 02373 ©2010 HydroCAD Software Solutions LLC PROPOSED CONDITIONS Prepared by HUTCHINS ENGINEERING Printed 4/17/2017 H vof o CA[Yw 9'10 s/n 02373 ®2010 HydroCAD Software Solutions LLC Paue 2 Area Listing(all nodes) Area CN Description (acres) (subcatchment-numbers) 0 384 56 Brush,Fair,HSG B (2S,3S) 2 668 60 Woods,Fair,HSG B (1S,2S,3S,4S) 0 626 69 50-75%Grass cover,Fair,HSG B (1S,4S) 0.289 98 DRIVE (1 S,2S,3S,4S) 0.078 98 HOUSE (4S) 4.045 TOTAL AREA PROPOSED CONDITIONS Prepared by HUTCHINS ENGINEERING Printed 4/17/2017 HydroCAD8�9.10 sln 02373 Q 2010 HydroCAD Software Solu lions LLC Pane 3 Soil Listing(all nodes) Area Soil Subcatchment (acres) Group Numbers 0 000 HSG A 3 677 HSG B 1 S,2S,3S,4S 0 000 HSG C 0.000 HSG D 0.367 Other 1S,2S,3S,4S 4.045 TOTAL AREA PROPOSED CONDITIONS Type II 24-hr 25-YR Rainf611=4.40" Prepared by HUTCHINS ENGINEERING Printed 4/17/2017 HydroCAIXD 9.10 s/n 02373 0 2010 HydroCAO Software Solutions LLC Pace 4 Time span=0.00-40.00 hrs,dt=0.05 hrs,801 points Runoff by SCS TR-20 method,UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S:NORTHERLY PORTION OF SITE Runoff Area=77,915 sf 1 11%Impervious Runoff Depth=1 08" Flow Length=450' Tc=12.1 min CN=62 Runoff=2 52 cfs 0.161 of Subcatchment 2S:MIDDLE PORTION OF DRIVE Runoff Area=28,285 sf 19.62%Impervious Runoff Depth=l 33" Flow Length=555' Tc=8 7 min CN=66 Runoff=l 34 cfs 0 072 of Subcatchment 3S:LOWER-MID PORTION OF DRIVE Runoff Area=15,565 sf 8 87%Impervious Runoff Depth=1 02" Flow Length=490' Tc=11.0 min CN=61 Runoff=0 49 cfs 0 030 of Subcatchment 4S:SOUTHERLY PORTION OF SITE Runoff Area=54,415 sf 15.08%Impervious Runoff Depth=1.47" Flow Length=335' Tc=9 9 min CN=68 Runoff=2.72 cfs 0 153 of Pond 4P:BERMED DETENTION AREA Peak Elev=179.54' Storage=3,490 cf Inflow=2 72 cfs 0 153 of Discarded=0 11 cfs 0.153 of Primary=0 00 cfs 0 000 of Outflow=0 11 cfs 0 153 of Pond 5P:DRYWELLS Peak Elev=134 67' Storage=597 cf Inflow=1.80 cfs 0 103 of Discarded=0 13 cfs 0 067 of Primary--1.43 cfs 0.036 of Secondary--O 00 cfs 0 000 of Outflow=1.56 cfs 0 103 of Link 1L:RUNOFF TO WEST MTN RD Inflow=3 95 cfs 0 197 of Primary=3.95 cfs 0.197 of Link 2L:SOUTHERLY RUNOFF Inflow=0.00 cfs 0.000 of Primary=0.00 cfs 0 000 of Total Runoff Area=4.045 ac Runoff Volume=0.417 of Average Runoff Depth=1.24" 90.92%Pervious=3.677 ac 9.08%Impervious=0.367 ac PROPOSED CONDITIONS Type 1124-hr 25-YR Rainfall=4.40" Prepared by HUTCHINS ENGINEERING Printed 4/17/2017 HydroCAD9 9.10 sln 02373 02010 HydroCAO Software Solutions LLC Page 5 Summary for Subcatchment 1S:NORTHERLY PORTION OF SITE Runoff = 2.52 cfs @ 12.06 hrs, Volume= 0.161 af, Depth= 1.08" Runoff by SCS TR-20 method,UH=SCS,Time Span=0.00-40.00 hrs,dt=0.05 hrs Type 11 24-hr 25-YR Rainfall=4.40" Area(sf) CN Description 865 98 DRIVE 15,000 69 50-75%Grass cover,Fair,HSG B 62.050 60 Woods.Fair.HSG B 77,915 62 Weighted Average 77,050 98.89%Pervious Area 865 1.11%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.4 75 0.0200 0.13 Sheet Flow, Grass:Short n=0.150 P2=2.20" 27 375 0.2200 2.35 Shallow Concentrated Flow, Woodland Kv=5.0 fos 12.1 450 Total Summary for Subcatchment 2S:MIDDLE PORTION OF DRIVE Runoff = 1.34 cfs @ 12.01 hrs, Volume= 0.072 af, Depth= 1.33" Runoff by SCS TR-20 method,UH=SCS,Time Span=0.00-40.00 hrs,dt=0.05 hrs Type 11 24-hr 25-YR Rainfall=4.40" PROPOSED CONDITIONS Type/124-hr 25-YR Rainfall=4.40" Prepared by HUTCHINS ENGINEERING Printed 4/17/2017 HHyayoCAEM� 9.10 sln_02373 n2010 HydroCAo Software Solutions LLC Page 6 Area(sf) CN Descriotion 5,550 98 DRIVE 9,335 56 Brush,Fair,HSG B 13,400 60 Woods.Fair.HSG B 28,285 66 Weighted Average 22,735 80.38%Pervious Area 5,550 19.62%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (f/ft) (ft/sec) (cfs) 7.9 75 0.2200 0.16 Sheet Flow, Woods:Light underbrush n=0,400 P2=2.20" 0.8 480 0.1050 9.74 51.16 Trap/Vee/Rett Channel Flow, Bot.W=0.50' D=1.50' Z=2.0'/' Top.W=6.50' n=0.040 Earth,cobble bottom,clean sides 8.7 555 Total Summary for Subcatchment 3S:LOWER-MID PORTION OF DRIVE Runoff = 0.49 cfs @ 12.04 hrs, Volume= 0.030 af, Depth= 1.02" Runoff by SCS TR-20 method,UH=SCS,Time Span=0.00-40.00 hrs,dt=0.05 hrs Type 11 24-hr 25-YR Rainfall=4.40" _ Area(sf) CN Description 1,380 98 DRIVE 7,385 56 Brush,Fair,HSG B 6,800 60 Woods,Fair,HSG B 15,565 61 Weighted Average 14,185 91.13%Pervious Area 1,380 8.87%Impervious Area PROPOSED CONDITIONS Type Il 24-hr 25-YR Rainfall=4.40" Prepared by HUTCHINS ENGINEERING Printed 4/17/2017 HvdroCAD®9 10 s/n 02373 @ 2010 HvdroCAD Software Solutions LLC Paae 7 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/ser.) (cfs) 10.3 50 0.0500 0.08 Sheet Flow, Woods:Light underbrush n=0.400 P2=2.20" 07 440 0.1150 10.20 53.54 Trap/Vee/Rett Channel Flow, Bot.W=0.50' D=1.50' Z=2.0'/' Top.W=6.50' __ n=0.040 Earth,cobble bottom,clean sides 11.0 490 Total Summary for Subcatchment 4S:SOUTHERLY PORTION OF SITE Runoff = 2.72 cfs @ 12.02 hrs, Volume= 0.153 af, Depth= 1.47" Runoff by SCS TR-20 method,UH=SCS,Time Span=0.00-40.00 hrs,dt=0 05 hrs Type II 24-hr 25-YR Rainfall=4.40" Area(sf) r`N Desrrintinn 4,790 98 DRIVE 3,415 98 HOUSE 12,250 69 50-75%Grass cover,Fair,HSG B 33%O 60 Woods Fair HSG_R_ 54,415 68 Weighted Average 46,210 84.92%Pervious Area 8,205 15.08%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/ser.) (cfs) 7.5 75 0.2500 0.17 Sheet Flow, Woods:Light underbrush n=0.400 P2=2.20" 09 150 0.3000 2.74 Shallow Concentrated Flow, Woodland Kv=5.0 fps 1.5 110 0.0600 1.22 Shallow Concentrated Flow, Woodland Kv=5.0 fps 9.9 335 Total PROPOSED CONDITIONS Type//24-hr 25-YR Rainfall=4.40" Prepared by HUTCHINS ENGINEERING Printed 4117/2017 HvdroCAD®9.10 s/n 02373 @ 2010 HvdroCAD Software Solutions LLC Paae 8 Summary for Pond 4P: BERMED DETENTION AREA Inflow Area= 1.249 ac, 15.08%Impervious, Inflow Depth= 1.47" for 25-YR event Inflow = 2.72 cfs @ 12.02 hrs, Volume= 0.153 of Outflow = 0.11 cfs @ 14.67 hrs, Volume= 0.153 af, Atten=96%, Lag=158.6 min Discarded = 0.11 cfs @ 14.67 hrs, Volume= 0.153 of Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 000 of Routing by Stor-Ind method,Time Span=0.00-40.00 hrs,dt=0.05 hrs Peak Elev=179.54'@ 14.67 hrs Surf.Area=2,404 sf Storage=3,490 cf Plug-Flow detention time=412.0 min calculated for 0.153 of(100%of inflow) Center-of-Mass det.time=411.9 min(1,272.6-860.7) Volume Invert Avail.Storage Storag_e_Descriplion _ #1 177.00' 7,925 cf BASIN AREA(Prismatic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sa-ft) (cubic-feet) (cubic-feet) 177.00 430 0 0 178.00 1,130 780 780 179.00 1,930 1,530 2,310 180.00 2,800 2,365 4,675 181.00 3,700 3,250 7,925 Device Routing Invert Outlet Devices #1 Discarded 177.00' 2.000 in/hr Exfiltration over Surface area #2 Primary 180.50' 8.0'long x 6.0'breadth Broad-Crested Rectangular Weir Head(feet) 0.20 0.40 0.60 0.80 100 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef.(English) 2.37 2.51 2.70 2.68 2.68 2.67 2.65 2.65 2.65 2.65 2.66 2.66 2.67 2.69 2.72 2.76 2.83 PROPOSED CONDITIONS Type 1124-hr 25-YR Rainfall=4.40" Prepared by HUTCHINS ENGINEERING Printed 4/17/2017 Hydro_C_AD&9.10 sin 02373 (D2010_HydroCAD SoBware Soiullons LLC Page 9 pisearded OutFlow Max=0.11 cfs @ 14.67 hrs HW=179 54' (Free Discharge) 1=Exflltration (Exfiltratlon Controls 0.11 cfs) primary OutFlow Max=0.00 cfs @ 0.00 hrs HVY=177.00' (Free Discharge) 2-Broad-Crested Rectangular Weir (Conlrnis 0.00 cfs) Summary for Pond 513:DRYWELLS Inflow Area= 1.007 ac, 15.80%Impervious, Inflow Depth= 1.22" for 25-YR event Inflow = 1.80 cfs @ 12.02 hrs, Volume= 0.103 of Outflow = 1.56 cfs @ 12 07 hrs, Volume= 0.103 af, Atten=13%, Lag=2.9 min Discarded = 0.13 cfs @ 12.07 hrs, Volume= 0.067 of Primary = 1.43 cfs @ 12.07 hrs, Volume= 0.036 of Secondary= 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method,Time Span=0.00-40.00 hrs,dt=0.05 hrs Peak Elev=134 67'@ 12.07 hrs Surf.Area=472 sf Storage=597 cf Plug-Flow detention time=29.4 min calculated for 0.102 of(100%of inflow) Center-of-Mass det.time=29.3 min(900.2-870.9) Volume Invert Avail.Storaoe_ Storage Description #1 130.00' 445 cf 8.00'D x 5.00'H STONE ENVELOPE Z=1.0 x 2 1,393 cf Overall-279 cf Embedded=1,114 cf x 40.0%Voids #2 131.00' 226 cf 6.00'D x 4.00'H DRYWELLS x 2 Inside#1 279 cf Overall-a n"Wall'I hirkncss=226 cf 672 cf Total Available Storage D_e_vice_ ROUtina Invert Outlet Oevicec #1 Discarded 130.00' 12.000 in/hr Exfiltration over Surface area #2 Primary 133.50' 6.0" Round Culvert X 2.00 L=20.0' CPP,projecting,no headwall, Ke=0.900 Inlet/Outlet Invert=133.50'/133.00' S=0.0250T Cc=0.900 n=0 010 PVC,smooth interior #3 Secondary 136.00' 3.0"x4.0"Horiz.Orifice/Grate X 5.00 columns X 5 rows C=0.600 Limited to weir flow at low heads PROPOSED CONDITIONS Type 1124-hr 25-YR Rainfall=4.40" Prepared by HUTCHINS ENGINEERING Printed 4/17/2017 HydroCADS 9.10 stn 02373 ®2010 HydroCAD Software Solutions LLC Page 10 carded OutFlow Max=0.13 cfs @ 12.07 hrs HW=134.63' (Free Discharge) 1=t:xftltration (Exfiltration Controls 0.13 cfs) Prlmary OutFlow Max=1.40 cfs @ 12.07 hrs HW=134.63' (Free Discharge) 2=Culvert (Inlet Controls 1.40 cfs @ 3.57 fps) LondwyOutFlow Max=O.00 cfs @ 0.00 hrs HW=130.00' (Free Discharge) 3=Orifice/Grate (Controls 0.00 cfs) Summary for Link 1 L: RUNOFF TO WEST MTN RD Inflow Area= 2.795 ac, 6.40%Impervious, Inflow Depth= 0.85" for 25-YR event Inflow = 3.95 cfs @ 12 06 hrs, Volume= 0.197 of Primary = 3.95 cfs @ 12.06 hrs, Volume= 0.197 af, Atten=0%, Lag=0 0 min Primary outflow=Inflow,Time Span=0.00-40.00 hrs,dt=0.05 hrs Summary for Link 2L:SOUTHERLY RUNOFF Inflow Area= 1.249 ac, 15.08%Impervious, Inflow Depth= 0.00" for 25-YR event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten=0%, Lag=0.0 min Primary outflow=Inflow,Time Span=0.00-40.00 hrs,dt=0.05 hrs