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HomeMy WebLinkAboutWPO201400031 Plan - Stormwater 2014-10-21GENERAL NOTES OWNER: LICKINGHOLE CREEK, LLC Phase 2 P.O. BOX 1467 Phase 4 CHARLOTTESVILLE, VA 22902 DE VEL OPER: RI VERBEND DEVELOPMENT, INC. 17.00 321 E MAIN S, SUITE 201 Units CHARLOTTESVILLE, VA 22902 27 A TTN: ALAN TAYLOR ENGINEER: COLLINS ENGINEERING 1.020 200 GARRETT ST, SUITE K 1,000 CHARLOTTESVILLE, VA 22902 ROW (acres) (434)293-3719 PRE-APPLICA TION 1.41 CONFERENCE: JANUARY 23, 2012 TAX MAP NO.: 05600-00-00-095AO 9.09 DB 2733 PG 150 Open Space (acres) 05600- 00- 00- 095BO 11.29 DB 2733 PG 150 25.84 05600- 00- 00- 05300 36.45% DB 4024 PG 489 TOTAL PROJECT AREA: 05600-00-00-095AO - 37.95 AC. Total Project Density (du/ac) 05600- 00- 00- 095BO - 76.49 A C. 0.979 05600-00-00-05300 - 25.49 AC. Total Project Open Space (ac) 139.93 ACRES TOTAL PHASE 11-1 V PROJECT AREA: 93.84 ACRES ZONING. R-1 RESIDENTIAL CLUSTER DEVELOPMENT AND BONUS DENSITY STANDARDS ARE BEING IMPLEMENTED DENS/ TY- ALLOWABLE DENSITY FOR STANDARD LEVEL CLUSTER DEVELOPMENT. 0.97 DUMC � + 57 DENSITY BONUS FOR STREET TREES AS SPECIFIED IN SECTION 32.7.9 = 0.97 x [1+0.05] = 1.02 DU/AC PROPOSED DENSITY- PHASE ll: 27 UNITS 27126.48 AC. = 1.102 DU/AC. PHASE Nl: 17 UNI IS 17117.00 AC. = 1.100 DU/AC. PHASE I V.• 46 UNI IS 46150.36 AC. = 0.91 DU AC TOTAL: 90 UNITS 9019384 AC. = 0.96 D61AC. OPEN SPA CE: OPEN SPACE A (PHASE 11) =0.66 AC OPEN SPACE B (PHASE ll) =10.63 AC ((0.66-x-10.63)126.48 AC) =42.637 OPEN SPACE PHASE 1! OPEN SPACE C (PHASE I!l) =2.31 AC OPEN SPACE D (PHASE lI1) = 4.19 AC ((2-31+4.19)117.00 AC) =38.237. OPEN SPACE PHASE Ill OPEN SPACE E (PHASE I V) =25.84 AC (25.84/50 36 AC) =51-J1% OPEN SPACE PHASE IV TOTAL OPEN SPACE PROPOSED= 43.63 AC (43.63/93.84) =46.5% OPEN SPACE TOTAL OPEN SPACE TO BE OWNED AND MAINTAINED BY THE HOMEOWNERS ASSOCIATION. ALL OPEN SPACE SHALL BE RESERVED IN A DEED FOR THE COMMON USE OF LOT OWNERS IN THE SUBDIVISION. BUILDING HEIGHTS. MAXIMUM BUILDING HEIGHTS SHALL NOT EXCEED 35 jFEET SETBACKS: FRONT.• 25' SIDE: 15' REAR: 20' SUBDIVISION STREETS: CURB & GUTTER WA TERSHED: LICKINGHOLE CREEK WATER SUPPLY WATERSHED AGRICUL TURALI FORESTAL DISTRICT- NONE TOPO & SURVEY- TOPOGRAPHY IS COMPILED FROM SURVEY BY A COMBINATION OF ROUDABUSH, GALE AND ASSOCIATES AND LOUISA AERIAL SURVEYS INC., JANUARY 2007. BOUNDARY INFORMATION IS COMPILED FROM BOUNDARY DATA PROVIDED BY ROUDABUSH, GALE, AND ASSOCIATES DATED APRIL 2013 AND ALBEMARLE COUNTY RECORDED SUBDIVISION PLATS. DATUM: NAD 83, BENCHMARK LOCATED ON TOP OF EX MH C.ZI-MH-81 EXISTING VEGETA TION: PARTIALLY WOODED LIGHTING. NO LIGHTING IS PROPOSED PHASING. SITE TO BE DEVELOPED IN A MINIMUM OF THREE (3) PHASES ALL OPEN SPACE MUST BE A MINIMUM OF 257 OR GREA TER FOR EACH PHASE OF THE DEVELOPMENT. PARKING. 2 OFF-STREET PARKING SPACES SHALL BE PROVIDED ON EACH SINGLE-FAM/L Y LOT ON -STREET PARKING SHALL BE PROVIDED AS NOTED WITH THE STREET DESIGN. BUILDING SITES. PARCELS 1-133 MA Y NOT BE FURTHER DIVIDED. A M,IIN/MUM OF 6,038 SF BUILDING SITE AREA /S PROVIDED ON EACH LOT. SEE DETAIL ON SITE PLAN' SHEET. BURIAL SITES: NO CEMETERIES WERE FOUND DURING FIELD INVESTIGATION OF THE SITE. STREAM BUFFERS: THE STREAM BUFFERS SHOWN HEREON SHALL BE MANAGED IN ACCORDANCE WITH THE ALBEMARLE COUNTY WATER PROTECTION ORDINANCE RETAINING WALLS: NO RETAINING WALLS ARE PROPOSED CRITICAL SLOPES. • CRITICAL SLOPES ARE EXISTING ON SITE AS SHOWN ON THE PLAN. A SEPARATE WAIVER REQUEST HAS BEEN APPROVED FOR THE 1.40 AC. OF PROPOSED CRITICAL SLOPE IMPACTS UNDER THE PRELIMINARY PLAT APPROVAL SUB2012-38. IMPERVIOUS AREAS: SEE CHART Westlake Hills Phase 1 Phase 2 Phase 3 Phase 4 Acres 46.09 26.48 17.00 50.36 Units 47 27 17 46 Density (1.02 Max) 1.020 1.020 1 1,000 0.913 ROW (acres) 7.14 2.28 1.41 3.92 Lots (acres) 22.15 12.91 9.09 20.60 Open Space (acres) 16.80 11.29 6.50 25.84 Open Space % 36.45% 42.63% 1 38.23% 1 51.31% Total Project Density (du/ac) 0.979 > Total Project Open Space (ac) 60.43 NO TES: 1) THIS PROPERTY DOES NOT LIE WITHIN AN AGRICULTURAL ANDIOR FORESTAL. DISTRICT. 2) ONLY (1) DWELLING PER LOT SHALL BE ALLOWED. 3) THIS 100 -YEAR FLOODPLAIN LIMITS EXIST ON THE SUBJECT PARCEL, PER ON FEMA MAP NUMBERS 51003CO2290, 51003CO235D, 51003CO237D, & 5100,3CO245D ADOPTED FEBRUARY 4, 2005. THE PROPOSED DEVELOPMENT SWM PONDISEDIMENT BASIN OUTFALL STRUCTURES AND SANITARY SEWER EXIST WITHIN THESE LIMITS. 4) EACH LOT AS SHOWN HEREIN CONTAINS A BUILDING SITE WITH MINIMUM 6,038 SF BUILDING SITE AREA AS SHOWN ON THE SITE PLAN, WHICH MEETS THE REQUIREMENTS OF SECTION 4.2.1 5) ALL PROPOSED UTILITY AND DRAINAGE EASEMENTS SHALL BE DEDICATED TO PUBLIC USE. 6) STREET TREES SHALL BE PROVIDED ALONG ALL THE PUBLIC STREETS 40' O.C. IN ACCORDANCE WITH '/DOT AND ALBEMARLE COUNTY STANDARDS. 7) THE STREAM BUFFER SHOWN HEREON SHALL BE MANAGED IN ACCORDANCE WITH THE WATER PROTECTION ORDINANCE OF ALBEMARLE COUNTY. 8) UTILITY EASEMENTS SHALL BE CENTERED ON THE AS -BUILT LOCATIONS OF WATER AND SEWER FACILITIES. PHASE II III & IV WPO PLANS WHITEHALL DISTRICT ALBEMARLE COUNTY, VIRGINIA SHEET LAYOUT SCALE: 1" = 300' J11 TH, 00 y ^ _Q{ ^... �j� , (C ) 3 x SCOTT R. COLLINS � No. 35791 . IONAL EIS VICINITY MAP SCALE: 1" = 2000' WPO PLAN SHEET LIST Sheet Number Sheet Title 1 COVER SHEET 2 EXISTING CONDITIONS 3 GRADING PLAN & OVERLOT GRADING PLAN 4 GRADING PLAN & OVERLOT GRADING PLAN 5 STORMWATER MANAGEMENT PLAN (PRE -DEVELOPMENT) 6 STORMWATER MANAGEMENT PLAN (POST -DEVELOPMENT) 7 STORMWATER MANAGEMENT DETAILS 8 STORMWATER MANAGEMENT DETAILS 9 STORMWATER MANAGEMENT DETAILS 10 EROSION & SEDIMENT CONTROL NARRATIVE & DETAILS 11 EROSION & SEDIMENT CONTROL PLAN PHASE I 12 EROSION & SEDIMENT CONTROL PLAN PHASE II 13 EROSION & SEDIMENT CONTROL CALCULATIONS 14 EROSION &SEDIMENT CONTROL CALCULATIONS 15 MITIGATION PLAN IUTAL 15 PAGES APPROVED by the Albemarle COLI ty Gorlimu ijry C,Ievele pment Department Date ;i File, ;, •_i;' l APPROVALS DATE DEPARTMENT OF COMMUNITY DEVELOPMENT PLA'NNER/ZONING. ENGINEER INSPECTIONS ARB DEPARTMENT OF FIRE RESCUE j ALBEMARLE COUNTY SERVICE E A.CiT IORf 7.`Y VIRGINIA DEPARMENT OF'TIZ.ANSPO TATIO I-IEAI.1"114 DEPARTMENT COLLINS ENGINEERING IS NOT RESPONSIBLE OR LIABLE FOR ANY CONSTRUCTION OR DAMAGES TO THIS PROJECT PRIOR TO ALL FINAL PLAN APPROVALS. z O a U LU 0 z 0 LU ce U) ZW Q 00 H U) W Ce W 0 w 00 o z 0 CQ (�\) Q_ D 0 Q) 1- 4 O U W �z o� W W �•, Z �.� -00 W L (n ` QZ E--aLL]o ~ W a �- W o 0 o- W 0 0 U Z � W U O (� Q V / O Q 0 J °' x X r 1 V 0 0 � o Z 0 WC) Z c dW O Z CD C W U V) co � L W Z� J J O 0 0 U U O o--,, �0 o0 � 0- >� W U O X ., N U L -C �V) C v o LU J U �0 U -0LU_ w E U •- O O N O JOB NO. ° 0 112072 0 m j m > SCALE 0 N a D AS SHOWN ._ oL O N SHEET NO. n 0 1 (D u) Qj 6 3 F_ z F_ LU w w z 2: 2: U) 0 a 1..[. H z U z U w D Q Ln z 0 U a 0 U a cin O� o > LU z 0 w 0 w III cn > > w � � W 0 w 00 o z 0 CQ (�\) Q_ D 0 Q) 1- 4 O U W �z o� W W �•, Z �.� -00 W L (n ` QZ E--aLL]o ~ W a �- W o 0 o- W 0 0 U Z � W U O (� Q V / O Q 0 J °' x X r 1 V 0 0 � o Z 0 WC) Z c dW O Z CD C W U V) co � L W Z� J J O 0 0 U U O o--,, �0 o0 � 0- >� W U O X ., N U L -C �V) C v o LU J U �0 U -0LU_ w E U •- O O N O JOB NO. ° 0 112072 0 m j m > SCALE 0 N a D AS SHOWN ._ oL O N SHEET NO. n 0 1 (D u) Qj 6 3 z 0 z LLJ V) 0 C) 0 0 3 fj) U) Q) x 0 O O O U3 c 0 0 _j ........ ........ ........ ...... NOTES: UNDER CONSTRUCTION. CONTRACTOR IS RESPONSIBLE FOR NOTIFYING THE ENGINEER OF ANY DISCREPANCIES BETWEEN CONTRACTOR SHALL VERIFY ALL TIE -IN ROAD CONNECTIONS FOR WESTLAKE HILLS ROADS TO ANY ROAD EXISTING OR 20770 �SF SCOTT COLLINS Z THE EXISTING ROADS AND/OR CURB AND GUTTER AND THE PROPOSED ROADS, CURB & GUTTER. CONTRACTOR SHALL -DR CONTACT ENGINEER TO INSPECT CURB AND ROADWAY TIE-INS TO EXISTING ROADS, PRIOR TO ANY CONCRETE OR PAVEMENT 3,57 BEING PLACED. LU 2. CONTRACTOR SHALL VERIFY CURB ELEVATIONS ADJACENT TO THE SANITARY SEWER MANHOLES TO ENSURE THAT NAL 19 MAN HOLE TOPS ARE CONSISTENT WITH TH E ADJACENT PROPOSED CURB ELEVATIONS. NAL I-313, L=10'- 13. CONTRACTOR SHALL PROVIDE ENGINEER SURVEY WORKSHEETS OF ALL ROADWAYS, PARKING LOTS, ALLEYS, MANHOLE TOPS AND DRAINAGE STRUCTURES PRIOR TO INSTALLATION OF CURBING, DRAINAGE, OR UTILITIES TO COLLINS 626.66 VEY ENGINEERING FOR REVIEW AND APPROVAL PRIOR TO CONSTRUCTION. COLLINS ENGINEERING SHALL VERIFY ALL SURVEY SHEETS TO ENSURE POSITIVE DRAINAGE AND PROPER ELEVATIONS FOR CONSTRUCTION. ........ -7- =14' ........ 0022 618.353 ALL PROPOSED SANITARY AND WATERLINE EASEMENTS SHALL BE DEDICATED TO ACSA FOR PUBLIC USE. 4 .......... ALL CROSS DRAINS AND UNDERDRAINS SHALL BE INSTALLED PER VDOT STANDARDS. 10 -3C, L=10'- .210 099 _§35�099 7 ----------- 638.260� RIM 2.0 7 )OT STD� (;Lj-z i -6 0 INV UU 1. UUM 34B Q?7 SF� �_2 u NYLOPLAST PIPE Dl- L uj 3.000 OT --'20.4 L F @ 8.0% P T I�C-1 CL4R LOT: 0 0 Dl- B L=6' STIR 16 $FABI41C U 34 ........ U) 20030 �Sl INV IN. 627.37 �V; W2 13.2 L=li, D=Z5' _O*t 635.676 INV OUT. 624.9 (STR 14) f4U 635.100, Lu B (24" INLINE GRATE DRAIN) S LOT: ........... r4l 12' .23270 -- RIM. 632.0 638.224 INV OUT. 629.0 bT B-18 ;LU F/: 72, D 2 T ADS NYLOPLAST PIPE 20 -1 SF PRIVATE DRAINAGE EA§9M 28,2 LF @ 8.0% SE "INV IN 626.74 STR 18 UT. 625.50 (STR 16) INV 0 INLINE GRATE DRAIN) .... LOT:'70 4.0 INV OUT. 612.0 Z'Z4b 20187,�$F -14B . .... . RAI ui 12" ADS NYLOPLAST PIPE 27.7 LF @ 8.0% 3, L=10' STR 14B 1-3 INV IN. 609.78 6 D (24" INLINE GRATE DRA N) NV OUT. 609.10 (STR 14) RIM. 594.0 97 INV OUT. 592.00 60S �4.061 12" ADS NYLOPLAST PIPE uj D -10B N--. 1-3C, 2 SF 30.9 LF @ 8.0% YAR 'STR 1 OB INV IN. 5W53 < 30BY INV OUT. 586.90 (STR 10) DI -38, L=l 6 -'E (24"INLINE GRATE DRAIN) z z 1-3 615481 w Lu uj RIM. 632.00 18.985 ul 6 - 2,0&l INV OUT. 630.00 0 E-32 \F' 200�p 12" ADS NYLOPLAST PIPE ly"*�Dl 3B L=12' u TO CID 15.0 LF @ 8.0% \ �4 0 0 u ...... kj U Ce uj Lu ti- STR 32 635.860,'�', INV IN. 628.80 a- CL INV OUT. 624.00 (STR 30) 66 > F (24" INLINE GRATE DRAIN) > > Lu Lu uj RIM. 616.00 Q� Q� INV OUT. 614.00 0 -30B F 53.0 LF @ 2.0% 12" ADS NYLOPLAST PIPE 1-3C, L=l STIR 30B 12000 INV IN. 612.94 1-7 9 15.32 LOT: INV OUT. 612.70 (STR 30) 'F INLINE GRATE DRAIN) G (24 . . ........ RIK 616.00 1-313, INV OUT, 612.00 62 OTISTC 17'V 39 TSTD�'UD-4 G-66 12" ADS NYLOPLAST PIPE ...... 594. 152 0 LF @ 9.0% Lu STR 66 -615.38 LOT - ORA 4[MFL 2 00 LOT 1 Ulb SF INV IN. 598.32 27 14B INV OUT. 594.80 (STR 64) -iT-(24' INLINE GRATE DRAIN) INV OUT. 592.00 . ..... RIM. 594.00 -TAM '20029 SF AINC LOT: 65 H -62B 12" ADS NYLOPLAST PIPE 11.2 LF @ 8.0% L9 OFQ DF STR 62B RIVATE =N 7 (y) 1 'VAk WIDTH. 4G INV K 591,10 INV OUT. 587.90 (STR 62) A- o (y) 1% �& YA I upo§� TW x CEO= PROPOSE 586 000 LOT: 64 _b'VARWIbpi _006r,�SF E)NcM_ IN 20 PRIVATE L= 12'- r 601.3 \MH CN 0) )SED LOT 102 572.594 CD ;wA CN . . . . . . . . . . . . 211154 SF CN L WM ()T -1 . . . QT: 103 x 20570/83F 313, L= 2' 313, L= 2bW2 8-F 600.448\ z Ld 0-6 cL LIELLLL z > STrD. CD -_-4, U) )33 413 54 '5 io.653 55 'o 580.087 VDOT S7D 0 '�­kQT 6 L9 LLJ 0, 6 9 8 -Uor-u, jr WIDTH if DRA 06 P L I RIP P ROPOStD VDOTT_5E-C---lr D -VOGEOF 2=1 5.25`; L=j D=25 588.666/ -313, L W 1 3. 2 5:,;Ni, -DI .9 584.752 I _j 0 W23 SP 580.74' OT: _68 0 r _0 207F68 �,F--//- L L L -LOT . A ul U) UJ I N, SL --3F 0202 �-I:�ROPOtEb VX)tT I RIPRAP 0046 F W R /QEOFAB lu Ul ER , __l / / __-Alt&MA NANCE ESMT,-i-/' ; �w -,E =6'; W2:�:� LLJ All -I LL�Lffi L R�l z cr- sft Cn n D��STI�[q CRITICAL CE T C ZK, 0 ISTURBrA YP.) W w ry ER INV OUT. 550.32 TREW FFE: 0 0 ry MATCHLINE - SEE THIS SHEET WffE MAN AGEkiiNT FA D�'ACCESS .2 x 'T C:) C:) 7- -7 -7 7 T - -,T' 7- _T __7 7- 1,14 0 7 -7 7 (D 0 wu 7-1 Lu 7' 10 4- T E uj D E 0 0 s R! v,< /___EX H / w CZk_ M�j -0 CL 0 SE (_7 -�VER ___o_ WS 0 A 1 YCP EME JOB NO. -0 0 - SEE SWM SHEET FOR DETAILS PROPOSED 18" -RCP 111 -0 �]-YH-83 STORM PE E X� V, [A _/ . V - G�_ 017-! --W-H--- 8 2/ -/_7 F GRAPHTO SCAL 112072 ul > L=243; S=1.67% 100 -YEAR FLOODPLAIN INV IN. 550.73 50 0 25 50 100 200 SCALE -l00- STREAM BUFFER INV OUT. 550.32 1 50' R YIP �A IT 7 1 MATCHLINE SEE THIS SHEET IN FEET 7- SHEET NO. 0 T- 0 U) 7_7 - - ----- Q) 1 inch 5 3 x T .... ...... 7 Short Version SMP Computations For WOrksheets 2 - 6 \.Albemarle. County. Water Protection Ordinance.. Modified. Simple Method Plan: Wostla . ke Hills Phase 11114 1 V SWM Proi . ect Area Water Resources Area- ... . .. . ...................... Developrnent Area 7----------------,1 ........ .Prep KKW Date: ----------- P ect: Draina e Area De signation PR&DA# 1, 2. 4- P.,��T-DA# 1,, 2, 4A,1 413 r0i - ------- ------------ storm pollutant export IM000nds, L (P(Pj)Rj112 JJ O(A)2-72 1, Ry mean: runot f,cop.4 c je Rv =::0.05 4� 0 lit Pi small storm aprrection factor.: 0.9 1, irn I ,P arinualpreoilpit on,4 JhAftftrte re Post ........... A Oroject area 16 acres imsubi & a, :A:� leg rapage orp---------- -- pollutante.oncontration, rrg/I-or-ppm,10rgtetphos horus. P­ fac tor, ap' 0 e d to, RR, P 7 -Y lairedtre6tment'volup-, over im.. po�rv� area A(j)4W0(0,,5/12 /2 - re0red removol:,: L(post), - fxL(Pr RRIP. �-,(Oqst) & ------------ -- I Item . .. ..... ... Area !p�qdpvollop ot d -jRop *,a (includesC&G) .6a wo (inGlUdleS OW d y y no. b .1 Resid Resid nces , Width: $U tota ences )T' -Drivewa D ly r \eway dewalks 'Sidewalks I .... ...... . ..... . 0. Homes! T Homes 149;8381 areas Area Grawl �reas A_rea i XN "I' N, V N X N,�\,\\�\ \Y 1, NQTE: IMeEiRVI[OU'S AREA IS APPR 0 /THE �ROJTzCT PPS�-DE: F. TH OXIMATELY 747,865 S EXTENDED Dl� JA0 S -1M E -R A TENT�ON BA&INS SHALLBE DESIGNED TG -TREAT 35% OF THE P V U_ -AR <n -(HE PROJKT RE 'A� A��)fflQv`. -QLYAED OVAL RATE IS 35%. THE WES- LAKE HILLS PHASE 11-1 - IT ZDEVtLOP,4ENT PAYS INTO THE UCKINGHOLE-CREEKPROA�TA SHARE, WHTC-H -PROVIDES SCOTT, R. SCOTT COLLINS AbDIT10NAL R�MTVA)z qPEDtrFOR-THEDEVELOPMENT. No. 35791 Z' J U J V B4 #4 0 ORAL ;00,00, <1 y k 1Z, z r Zz", V ZZ x X Z j Z X 0 0000" U ,0-0 U) UJI t r) Z 0 -Z 206,24 > Uj A cr_ l\V\ 0 4 /4// 1//// )0.0�0-__ 84j� 001: 357,83 4WK* ;Active.cr plarid :A 2,207 621`x:0.01:# UjQ76� fivated: tu 128:935i f �,586 691 lX U8 yards and c tAt,tivv land Area rea OP ixi() 25 01 �x 1, U6,= 0, Road 'way Sidewal k aRoadway Sidewalk �subt6u: 4W 4,Zj:$j 114,1451 56,8461 mpe 44V J(Post) E� FL9 Tc=\q.ighrs. LU rs. 0.35 A�% 1�1-0 0. i P W to 63,hrs C IFLOW 00 fill ew 2 exist 20%) EE H Area C f 41* TVj* LCP ONS/FOR N Fj� - Z- 9UR,,§C� NA Sl� rs. kTc='�O.= !e 0 V,( )e 4 41W 4W 23 56 X -- I I 86 1 IP 0 71 C�ITIO T I D AL DETAILS LLI /4! 4W 4W �99516 'SF� V Z Z Uj Uj UJ V) 0 LLI 0 0 ' S /*A TOP 3,0 Uj f ------- -J U U Ce Uj Uj U- Ul) E-1 Uj Lij W V) 9 -ac. > D A,-#-4- LOT�� �-11453- SF.- LLJ 7 > > 4V Uj UJ Q-1 -20465/SF -�SHEE4 Ce Ce 41V FLOW 4hrs -C -h- C0�1Q./FLOW'Tc= -5t ---=0.22 rs 4W . ...... TC 4W &��WL FU FI NALff c= o., ) \ \ ............. 41P < SEE 4`/. -HOU 4W ................... CAILCULATIO,,t R\ E ................. 41P ................ ....................... 23895 ......... �A\ ADDIT19NAL D(�AIIS��-- ................ ......... .... .... .. live . . . . . . . . . . . ........................... ......... .......... 7 ............. ............... ............... ....... ...... ....... ....... .2190" 1 IMF 4W40F. Uj ........... ............ 'W4 .............. ..... ...... . ..... ....... ............. ............ SHEETFLOW 1c=o.iqnrs.S LO --CANN .0 C0NC:*L N 05hrss )w 2-1038�1, S -tc -h SHEET rL f R C, FLO -Tc�oo 411V 5 rs KANN Et�0W=!Pqofi r-s.�- 6 FINAL qE L4L47 R, S, CA LA N -ADDIT] L --D NI 49— LOT CA �S T L9 ;0� A1,962 -,SF //CAL j.;OT.: 21. CY) I- /AD -9 -�SE 41k cyi F. 0) .71 20�03-�SF 1W T 4# CY) LU Q) 4W, Nona= �0442 S�,' 0 N n r -L C:). .... ........ Z, C', 0) 0 .. ........ C-N--5g.:L Lij 7 h N F Ab :3 -7 Q) /* LOT �6 -L '46 Ui -2 06 .......... UiLd Ld tUi CZ -0 CD LO U) V) -200 8 /SF 0 Z D- W 0 ......... . r 0 L9 1Uj tOil S ......... . D.A. Y #1 13-74 ac- -04-=6-o 0 UJ Q) V) -Tc= 0. (D �4 h r 0 0 0 W 6000 cv� t0 U) Uj U1 /2 9l/S p:>fr, /. - I ...... I I Z F-: /34 V) W W WL MH Z LLJ ZI-MH 7 Uj F- LU > 011- LOT,- -,4 -25 S 57() C:) ..... ..... G 0 C) X N LOT 36' GRAPHIC SCALE __0 0 20ql OY SF..,. ��-f so 40 80 160 320 MH 0 0 LU j-,J/General construction notes for Stormwater Management plans b Q) Q) LU IN FEET $9/' E �L i. All dams and constructed fill to be within 95% of maximum dry density LU I inch �26o4;j E 0 0 CL /and 2% Of Optimum moisture content. All fill material to be approved by 80 ft. 0 ......... a geotechnical engineer, A geotechnical engineer is to be present during JOB NO. one . ..... VOT-' construction of dams. 112072 T 2. Pipe and riserjoints are to be watertight within stormwater 0 .20028 SCALE management facilities. 0', 1 80' rt 3. For temporary sediment traps or basins which are to be conve edto permanent stormwater management facilities; conversion is not to take > -a . ..... SHEET NO. Q) 0 place until the site is stabilized, and 5 permission has been obtained from the County erosion control inspector. - " v-, ,�- ZI, / / � I � � __ _� 1-1 I , I 11 I/ / 11 � / , i 1 � --/- ,- -/ / - __ \ , \ `i1ii, 1, ,� , " -, � \ . , I \ \ -, �, I I " 11 lk;�_ ------, --\ ­�, I- I . , A / / I ! � I , � Ir , �, _� /-) . -.-I- _____� -7 � N - � -_ , I / / � I , I ! \ -,-- � IIII, ,I � � k ; � � / FL -ENG -21A,,- �2-' ,- , ; I ,I _,�`�\\\�, \ 1, \ \ \ \ \ ,// / J U.S. Department 0 . I // / i i I � \k \ � �� , ,-- / �// / , / 11\ U.S. Department of Agriculture FL -ENG -21A - U.S. Department of Agriculture FL -ENG -21C I � � \�l I , \�\ � f Agriculture I / /// lil I " , , \ � ,\ . k __1 ��/ / , Natural Resources Conservation Service 06/04 1 , Natural Resources Conservation Service 06/04 - - / i � I I \ /I , / -V rp 06/04 < ­-> ,,- �/' .� 11 \ \ \A- - \ , I Natural Resources Conservation Service -, , � I I �� -_ .- ---- I 1\1�1�11 _/ / I / /,/ I", 0 1 .- - I \ \� ., - _� 1'�"11\ XI -1, ___ Z / A"� / "', - ___ , \ �---- ) � , \ , \ -, , - - � �� I 4 ­­'- � V\ .. ... ........ ��,\ '-- __ __ __� /, / I 1 / I - ------- , , _,�_�\_� TR 55 Worksheet 2: Runoff Curve Number and Runoff ( I / , // /// I i N \ I I �_ - ��\ \\ --�', ,­- --/I� - , � ', ,1 / - - I . . . . . TR 55 Worksheet 3: Time of Concentration (Tc) or Travel Time (T,) � <1 . . . TR 55 Worksheet 4: Graphical Peak Discharge Method . I I . . - � - - / I / . 1\� , \ 2 I �, , / � I /, � � _��_ i � \ \ I \ i 1_�,_ __::�\_ __,_ i, f ,� I/ ,,�/ // , , I I , I , , (, � \�, \ \ - � l' , ��, �`, /k, i \ C�_, - - , , I \ \ \ � \ - " . I ___ - - , ,,,, / / , � / ) \ X � li �, I i ,/` I . I . \ \ \\\' � ;� I �>__11 __l � I I I I ) I . I ; _\__� , �� / ­ I I I �/ // / ",/ , �J I - __ _` - " "-- _\,� - � � i 1� \ I I � _-, , / I \ �_ _,/�__,__",11',�,/////'1` , � - --- , � � � ", Designed By: KKW, PE 3/4/2014 \� . , -IV Date: - - I �\ \ \ - - - � - Project: . Westlake Hills Phases 11 - - Project: Westlake Hills Phases II -IV Designed By: KKW, PE Date: Project: Westlake Hills Phases II_IV Designed By: KKW, PE Date: 3/4/2014 __:::�:: , ,Z�_ // / / \\\, , \ \\ \ I --,, ��,,"�, � ,---' �� \ -7- ---- ,'�- 11 SCOTT R. COLLINS'Z Crozet, VA Checked By: KKW, PE Date: 3/4/2014, ­ - -_ --- - I \ \ \ � \ �� � I I"?/ ­-, \ 0 �­l Location: - - --- - _�__�, \\ \ , �. 1�_ - il /11 ""," -_ 11 1� Location: Crozet, VA Checked By: KKW, PE Date: 3/4/2014 Location: Crozet, VA Checked By: KKW, PE Date: 3/4/2014 ___ �Z_ �� \_J � , � �_) No. 35791 1 � - - - --- --' \ � \\�' �, , '-,��,­\� - � I - \ __ __ - ;�,� I � " __ 'i , \ \ I � . \ , / , \ , - - - - --------- ____________________ ....'r , , I . \ �, I �Z I zz::, � � �_ __ - - , - _:��� - - 0 " � ,_ -- - ,-\,\\ -�� " , _ � , 11�� , Check One: Present X Developed X I -1e00----:--- -- ,,, __- , _11_ - ---\, � I _� ,_ . � I ,:�t I t -_ - i �\ 11 - � . , k+ I iA Check One: Present X Developed X � ____ - ___11 I ) -- - . ��,,/-_ � _____________ I Check One: Present X Developed X - . ,�� \ -1 - I - Check One: Tc X T, - I \ \ I , \\ ) - 'I-, ___ - - -, - X fi,� \, - 11 I 1. Runoff curve Number (CN) - 11 �� - - /, N �\ _\ .� \ \ `-, ------- ­-, :�- _�- _/ , N _� Through subarea . - � , �, \ I-- :_ _::::::- _::�� -- -­­ ___ \�, � 1, \ )I � 1�, k I" I / IONAL 'F1 Drainage , Soil name and Cover description (Cover type, treatment, and hydrologic condition; D.A. #2 Area Product of CN (weighted) = Calculated Area hydrologic group percent impervious; unconnected/ connected CN (Acres) CN x Area total product/ 'S'Value Description (Appendix A) impervious area ratio) 3. Rainfall, P (24 hour)- inches 7 Surface description (paved or unpaved) Unpaved totalarea - - Unpaved Impervious Areas 98 0.00 0.0 8 Flow Length, L (ft) 900 D.A #1 B Woods in Good Condition 55 1.16 63.8 60.5 6,53 (Present) 0.106 Lawns in Good Condition (75%+ Groundcover) 61 12.58 767.4 - 0.098 - - Impervious Areas 98 6.45 632.1 5.25 5.25 D.A. #1 B Woods in Good Condition 55 0.00 0.0 72.0 3.89 (Developed) __� Lawns in Good Condition (75%+ Groundcover) 61 15.22 928.4 1 - - 0.22 Impervious Areas 98 0.00 0.0 690 - D.A #2 B Woods in Good Condition 55 2.93 161.2 59.1 6�93 (Present) �5 Lawns in Good Condition (75%+ Groundcover) 61 6.24 380.6 _____ - - 1.70 Impervious Areas 98 1.36 133.3 1.13 2.49 D.A. #2 B Woods in Good Condition 55 0.00 0.0 70,0 4.29 (Developed) 2.55 Lawns in Good Condition (75%+ Groundcover) 61 4.25 259.3 -_ 1 - 1 Impervious Areas 98 0.00 0.0 1 1 D.A #3 B Woods in Good Condition 55 5.37 295.4 58�.5 7.09 (Present) 5.40 Lawns in Good Condition (75%+ Groundcover) 61 7.61 464.2 ROUTED 7.06 - 4.19 Impervious Areas 98 3.43 336.1 D.A. #3 B Woods in Good Condition 55 0.00 0�0 71_7 3.95 (Developed) Lawns in Good Condition (75%+ Groundcover) 61 8.44 514.8 - - - ImperviousAreas 98 0.00 0.0 D.A #4 B . Woods in Good Condition 55 6.74 370.7 58.3 7.16 (Present) Lawns in Good Condition (75%+ Groundco ier) 61 8.05 491.1 - I m pervio us Area s 98 0.49 48.0 D.A. #4A B Woods in Good Condition 55 2.34 128.7 61-8 6.17 (Developed) Lawns in Good Condition (75%+ Groundcover) 61 1.99 121.4 . fmpervio us Areas 98 1.6Z I / 8.4 D.A. #413 B Woods in Good Condition 55 0.39 21.5 703 (Developed) 1 1 ,Lawns in Good Condition (75%+ Groundcover) 1 61 , 4.50_J... 274.5 L_-- / Segment ID: D.A#1 D.A. #1 D.A #2 D.A. #2 D.A #3 D.A. #3 D.A #4 D.A. #4A D.A. #413 (Present) (Developed) - (Present) (Developed) (Present) - (Developed) (Present) (Developed) (Developed) - \"� \ � \ I 1< ", Drainage Area Drainage Area Drainage Area Drainage Area Drainage Area Drainage Area Drainage Area Drainage Area Drainage Area -- -- ___ / , ---- \ \' \ � � \ I--,- / \ � -- //' __ , I 'I', \�\\ 1_� _�__,_ / \ " \\ I--- / \ \\ \ \ _,__�,,_�, \ / , / 1. Data Description Description Description Description Description Description Description Description Description ' \ I/ I . \ \II \\ �\ \ \__<� "I '\4 /-,-- / / - , , D.A. #1 D.A #3 D.A. #3 D.A #4 D.A. #4A D.A. #413 �, - , , \\ \\ _J \.."', <, / S " I D.A #1 D.A #2 D.A. #2 Fk W4 ) .11 \ \ ',,\\ \ V ) 7, / / , " / / (Present) (Developed) (Present) (Developed) (Present) (Developed) (Present) (Developed) (Developed) OF_Vti=_5-��'- -_-_- � �_ \\ \,i I �/ \//% Sheet Flow: (Applicable to T, only) C � 11 / (ii, � � r___; \ MileS2 = !11 - ----- �__ . \ <�, - ,/ I Draina e Area (Am) in > ", \ L_ 1 9 0.0215 0.0339 0.0143 O�0088 0.0203 0.0185 0.0231 0.0075 0.0105 ?i I i - - - - - ­\�,­ -­,­ J - ��- - I Surface description (Table 3-1) Dense Grass Dense Grass Dense Grass Dense Grass Dense Grass Dense Grass Dense Grass Dense Grass Dense Grass - , �,, , \ J� v Runoff curve number CN= 1 60.5 72.0 59.1 70.0 58.5 71.7 58.3 61.8 70.7 � ____ ,X , \-�� � I �; 1- __ \ �, (-_ / 2 Manning's roughness coeff., n (Table 3-1 0.24 0.24 0.24 0.24 0.24 0.24 0.24 0.24 0.24 __ I I I __ \ - Time of concentration (Tc)= 0.24 0.17 0.18 0.16 0.19 0.18 0.22 0.14 0.21 - --:f- - __� \ ____ � \ ;_ \ 100 100 100 100 100 100 100 100 100 - - - - �, I \ \'� ­.­­­ i - \ � , \ I \ 3 Flow length, L (total L < 100) (ft) Rainfall distribution type= I I 11 11 11 11 11 If 11 I I - ,\, -\ \\\ ,\ �\\, J __J - - - I . I I - __ ___ , \11N ____ -_ "I 1 4 Two-year 24-hour rainfall, P2 (in.) 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 11 ___ - �� _____ __ __ \ -\ \\\ \ __ �_ ___ --- - - 1 5 Land slope, s (ft/ft) 0.03 0.07 0.07 0.06 0.06 0.05 0.03 0.06 0.03 11 0 0 0 0 0 __ __ - - - ____�_ ___ ___ \ I I- - __111 _______,� -----I- \1 - - - throughout the watershed= - -- - ,- - � -_ ',- �__�� ­__Z� -- - I SOA I Pond and swamp areas spread 0 0 .. . � 0 � - � � I - - =::�I_ .- _� - >-N \ 1. \1 - --_ -,,,, - ___ -�::� - - -- -_ --- --- Q 6 Compute Tt = [0.007(n-L)"'I / P,"' 1 0.19 [::�:O. =13 0.13 1 0. 1=4 0.14 1 0.15 1 0.19 0.14 1 - --- - , - _Z� _;� \ ___\ I , , > __ __ - - ---"!- --� \-\\ � - ---, , - �--<� ,',, - - - - _�_� , �� \ 1� -,N -,,-,- 1__�__ I 2 10 2 Frequency -years - 2 - 10 n/a Rainfall, P (24 hour)- inches - Shallow Concentrated Flow: n/a - Q- inches - 0.64 1.70 I(Present) -Runoff, Q- inches 1.25 2.67 3. Rainfall, P (24 hour)- inches 7 Surface description (paved or unpaved) Unpaved Unpaved Unpaved Unpaved Unpaved U npaved Unpaved Unpaved - Unpaved - 8 Flow Length, L (ft) 900 799 884 350 902 570 460 70 218 x 9 Watercourse slope, s (ft/ft) 0.106 0.104 0,107 0.103 0.106 0.130 0.098 0.171 � 1 0.050 10 Average velocity, V (Figure 3-1) (ft/s) 5.25 5.25 5.25 5.25 5.25 5 5 6.5 3.6 1 11 Tt = L / 3600*V 1 0.05 1 0.04 1 0.05 1 0.02 __� 0.03 1 6.03 1 0.00 1 0.02 1 1 0.26 0.33 0.22 0.22 0.15 6. Unit peak discharge, Qu- csm/in 575 690 - Channel Flow: 650 760 - � 0) 620 750 - - �5 2. Frequency -years 2 10 2 Frequency -years - 2 - 10 n/a Rainfall, P (24 hour)- inches 3.7 5.6 n/a - Q- inches - 0.64 1.70 I(Present) -Runoff, Q- inches 1.25 2.67 3. Rainfall, P (24 hour)- inches 3.7 5.6 3.7 5.6 1 3.7 5.6 3.7 5. Runoff, Q- inches 0.56 1.55 D.A #3(Present) . Runoff, Q- inches 1.23 2.64 D.A. #3(Developed) . Runoff, Q- inches 0.55 ,- 4. Initial Abstraction, la- inches 1.306 1.306 0.777 0.777 1.385 1.385 0.858 0.858 1.418 1.418 0.790 0.790 1.433 1.433 1.234 1.234 0.829 0.829 5. Compute la/P 0.35 0.23 0.21 0.14 0.37 0.25 0.23 0.15 0.38 0.25 0.21 0,14 0.39 0.26 0.33 0.22 0.22 0.15 6. Unit peak discharge, Qu- csm/in 575 690 - - 650 760 - - 620 750 - - 560 860 - - - 7. Runoff, Q from Worksheet 2- inches 0,64 1.70 1.25 2.67 0.58 1.59 1.13 2.49 0,56 1,55 - 1,23 2,64 0.55 1.53 0.70 1.81 1.17 2.55 & Pond and Swamp adjustment factor, Fp 1 1 1 1 1 � - - --- 1 1 1 1 1 1 1 1 1 1 1 1 1 1 9. Peak Discharge, Qp- cfs 1 7.93 25.23 ROUTED 1 5.40 17,37 - ROUTED 6.99 23.61 ROUTED 7.06 24.80 4.19 11.72 ROUTED - - -._�_ , \ \ \ \ ___ ___ -� _-__ \ -, \\-�, - __ �� __��"_ --- - ��-__::� ___�- -, �, -,�, \ ---�- --,, I / D ____�_,_,� �: �_ _� - - � " \ \\ I --,,, � ----_ - ___ -� -_ --,, \�\ � I-- ,,-,- -- - __�', " \ \ ,>6�\- Z - - 1_\ I , � � >��_ - 0 ---_--_---:::__--:::- -__�� ­�, -, ,\� \ ,�- ---, ,,,-­-� �' � � __ ____ ��, \ -,, \ \\ � \ , \\ \ \ �\ I-,' \1 � I t - __ - _<:_ �,�`-, �,�\ \ \ \\�,o - � \\,� \ � \ 1P, /_ \ �11 �1' , , - - -, <� , \ \\\ '19 \ \ 0� __ \\ \\ \ ,,, \ U , \ \ \\ 0 , \\ , ,- - - \ � N1, (1) - --, --- �,\\ \ \ \ \ @,�4p,_ 1 1-11" \_�_ , \ �� �\\ � \ � �.A -\�� , \ �� \� \ Q tg, -1 ,,� \, III ------- _�'- -_ ---- ------, \\ \ \ \\ \ :AN '0 "Y \ Z> n - � \ \ , \\\ \\\� \ \� \ \ . X, -- - � -- - ----� ,\,. -,� \ \ 1 7 'A I . , _', Z - �_- � __� , - -, � ,� \ \ \ \\ \� , \, \ \ . 1, 0 ___1>_ '_ \\ �\�"ii\ � \\\ N\ \ I \� "-�� \ \ ____ � __ \\ - �, , �� 0 V) , � - `\ \� \ \ " C"OK � __ --- ---,\ ,\� \ �� \ , P"n, 0, 1� 1-\1 - - 12 Cross sectional flow area, a (ft) �: �: I_ �!, . / / ­/ I/,,, __ I Z/1 I I �, / I / / -,��- -, -_ \ I I I LLJ --- / , / 7 1 -Z �,Z��_ I " , ,,, I �_ - - -_ - "* a) (U ­'_ cl�l , /0 ��, ��- � -_1 r , Z:� _77 --_-_ - I � 'i, \ \ \ \\\��,�v ­� ,��; - /� I , ��, _�\� \ , _, - - , --- , \ , \\ \ \� \\\ - - \ \ \ \ 1\ \ or , 'A V` - /' -4--/1,- ��/ , AM , I Z , _/ ,Z ,,,'�, , - - ... �\ \ - -< - \ \ \�y \ - _�\ . /, / // I , � "�', , I Z - - - \ I \ __",.��/ t ��,, /�-,-� �// / Z -��-� , \ ��' �_p , � E E / , _,_1 / I ,/ / / // , -� I ,__1' 0 t� 0 -� / ___ // ,/, __ �__ . -_ --- 1\ \,��\ \ "I \ .r �/ !* I ,�\� � \ \\ \ A I t�� __ , � / 1 /7/., - / // - � 400" "_ �� � . � , I I I . - --\, � \\ \ \ \ \ ,�"Z "'o-_ / - I , , \ � -701 ,�/ �, ,---- /", /� / ��-v ---�Z- � � \ �V, C� � 13 Wetted perimeter, Pw (ft) ��/ / / \ ", \ - ,/ /�,// - Ot / / , ; / N/, , I.V ��,//, � � X � ,� /! 'n, �� � � -_ / 11 I t'�\ 14 Hydraulic radius, r = a/P, (ft) EZ 0 ,o= C- I-, � I __ � ___ / I I __ __ __ - ___� -\ ,\��, \ . \ it' - - __ / / / . , ,�'z** 7-,I'S4 - -'-t \� \ \ \ I _\ �_ - _r_ ow ___1 / //1 �/ / �/,///// � , , \ �1_1 -i ,-,-,> X, - \\ N \ , "I WA, , � . I - 7_� � -- -- - -_ � Ii � � I 1\ - � ,A 6414F - - I I I I \, � \ -1 \�p �,,- \ \ \ , . J -_ , //, , // //P // , " ' ... L ,\ \, 1\ - __1\ , 'Y ') <� 1, . I - __ :�� "� ____ / I � 0 1 . N/A N/A N/A N/A N/A N/A N/A � 6 1 ',, _� Z.X, S __:_:�__ / * ' , 02 10 ,\ \ \\ -P, <, - Y \ , � _"� �� / /, 15 Channel Slope, s (ft/ft) E v E v , "�/� ___ - , � ///x/ / , , / / . I I I . , � I . . 1 .,201 2,41\ � . � - \->�_ - , X\ I I � , � �\\\ -,,, --, -, \ -, _____�, 1;1\� \ �' / - __ /� , // __ - - / �1,7 1 A - 11 ,;I- - -� , , � " , /' / / I . � /� .X, r '�� I � \ '\ ,_ I 11 \ \ // I/// , /// I - - - - I \\\ \ 16 Manning's Roughness Coeff, n ___ - -1 ___/ /I ,� � , �.\ � � .. - _-, --" \)i )� , � I I _�\�\\\ � 14�, V , \\ \ ,T) _�) / /' / 1Z - I - ." - 1c.1 // 11 - - � <' I � � I, \\� '\� --�, \,�, - -- - - �\ , \ \ \ \ > > :_ - " / . ". . ,_ � \ 17 V= [ 1.49�/Y'51 / n P ____5 / / , I - -\ -, \ - - - _�, "\ - 1_1� �', -, -\ , � I \\--, ,� , �,� / / / / I - �� � � \ \ - \ \ \ 1-- - - //��/,/ . . I - - � - - - i,\ -,� - -_ 1__'� , \ I , 2" ,/ I/ V, �� . . 1. I I . .1 I 1 1 � I i � " _____ \ \ , , " 1, / & ,- ��__-:� --- /,��/ /M/ / " / 7 . , - .. I I . . I '� '- \ ,\\\'\ 1\ \ \ , \' 18 Flow length, L (ft) ,/ , .; " - - - - __ ___� / /� .... / X \ \11 � �� .. .. . - - �, \ \ � I , I I - ___�, -_�­� ,�­,, --, \ \X /111� � >�c­ �\ - �� \ , N - \ \ , � 19 Tt= L / 3600*V 0.00 0.00 0,00 0.00 I 0�00 I 0.00 I 0.0 r � ��/, ,///�/////// // , 1 �135 \� 7�� -_ � - - Z�� �� \, � , \\\ , , \ I I I I J==0. 00 //�� / 1, , , . ---,-*. . \ I I � \ ��,� �, --- - - -,- -�, � , "-,\ \ \ \ � , \\-,\ \ -,, \ " \ ,\ , . �\ \ \ \ � ,'/ / //. _ \ \ - - I 05 �r I - I I I , . . I .,_-. . __ I ­__ - \ \ \ \ \ \ I � \ \1 ___ - __ __- ,- 1. I ... . _� � -\ \ \ \\\' \ // //, ... I I .. ..... � :-T FL9W\11 .a9, ,_ - - - , " �--,�, -�,\ \,\� \\1 \\� I I \ - 20 Watershed or subarea T. or Tt _:�X4___ � ./ / , . . \ --,� - 7t,_-4') I rF - - . \\ _____ - 11 \ __ - -- , Z/ /�// , // . , , I 1�r , Y// /1 - ...: .W � "I \ \\ \ r I (Add Tt in steps 6, 11 and 19) 1 0.24 ___L_ 0.17 1 0.18 1 0.16 1 0.19 1 0.18 1 0.22 1 0.14 0.21 I/ _1� - ,/� �- . � I I . I I I . 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I I 1-1-1 F-4 a- - (n �� 0 Z %.k 0-1 _J P-1 sz 0 P-4 Z - 0 U < , 0 Q) LLJ _J 0 - -C t_ 3: Q) (n a- Y) r_ .�-_ 0 < �_ _0 U X 0 (1) C Z :3 Z r.L -0 , W 6- 0 3� Q) (f) � U) (J) 3; (1) . � -0 0- _J W - _J t r% 0 1-4 V..`1 .c: (D �, -1 -r < C) - i, 0 Z -0 -C C : t' - UJ 0 3: < 0 0) !�e 2i�� .E- []� -Y < LLJ ,- I WK U) 0 lZ Z - 0 tii- W Lu t V) �- ('r) :3 :::j ,- LLJ < Z- - 3: 0 0 (-) U , 3: - 0 0 -�, 2 �, r_ � 0 q) W D_ 6 ,� t. -N , ,r- ;'...) � -0 - (D .2 > -0 �_ �� (/) :3 C� () 0 X 4,- Q) C) D Q) ,_ -C - - co C a) 0 � U U.J 0 _J 0 �_ W - F_ C -0 L-) Q) 0 LU �_ � u.J �_ .- 0 UJ D E ce M a - 0- U) -0 - -0 0 JOB NO. ! Q) C - 5 -0 112072 "' 0 0 (0 6 CO > SCALE 0 . &� -0 2 11 C 0 1 = 80' u -z- (0 � l_ Q) a > SHEET NO. a- Q) 0 (D V) U) - 6 ,V 0 = _r_ 11-- i� 10+00 SCALE: V:1"=5' H:1 "=50' 10+50 11+00 11+50 12+00 12+50 13+010 13+50 14+00 14+50 15+00 15+25 Technical Bulletin 7 Minimum Standard 3.02 I glial' .4d.. t' 8eet-ion 0/0- elia. 3100 v ca4 to W -i y} ectvxal 411 Z' :1--X .r' W_iar A 1/4 ?LOA rnaaaiscii - P Y9.. T 0 or a3. St+iatiana F3., . ��D t shi," with. 41ptkmla Prat* 00 H07 0, tolm ' PASM Sot etto'aa 3W, arrVWA a' eCT44 l i Jtr { , k , I \VD01 x3.31 '3.111'-f CHID ) ' I i f? 1 I 4 I ------ 1111_ I / - FIGURE 3,t1i - 7a 11omogenevus Enrhankrnents w1Neeprrgc Cownds ogerrerlus fiN 3.3.1 Kj` r_ m- ----- 1 ut off trench 4' Wow suftobie I mltetiol 1 S61 or rook > V L -_ _ - _-. _.. _- ._- _. - _..._ J TYPICAL HOMOGENEOU$ EMBANKMENT Transition NI ,-Rook or gravel I'3. outlet Co., .trxa 2% P4 riorat d eoeotor Foundation drain Blanket drain FOUNDATION DRAIN BLANKET DRAIN 0*" Moir Sand; qmd or reek Rack or grovel Rma to drain Transition fitter Transition finer CHIMNEY DRAiN TOE DRAIN .11; 6 DIM0i orf -S - MIN REQ'D. WQV TRAS RACKS TOB INSTALLED O ALL ;IgiI 1 41 t t, 123. A$ ddL ! ' i Elevation Basin. .1 $1 (2x) = 23,408 cf ORIF ES PER VSMH TECHNICAL BULLETIN #7 542 5;311 f I 4. 111 1 �;x:53 5'13 / 32160' 564 WQV P OVIDED = 32,397 cf ORIFICE COEFFICIENT= 0.6' 3,48. 24" RCPiI RISE AT ELEV. 551 33 RTEXTRASHi`RACK LEV 55400' I _ 1111____ _-------- ---_____­___i­_­­----Ii I _.--- ---' 1 560 100 129 ki I Outlet structure o ' __ . IKANS3N-CONCRETE TOP OF DAM;WIDTH=10' ANTI= AT �. , _____ __ 1111___-r __ __ _._---_---___ -1111_-__ __-__-___ _.___ ._. _.__ T _____ _- _____. __ _1 _11 -_-_-__ ._ ___ 1111__-_ -.. 1111___-- __.______-1111_ - --_- SCS name: 3.a -Year 24 -Hour SCS Method Storm 555 width for rest. (in) 0.000 \ t 100 YR WS = 552.928 discharge (cfs) 25.213 at 12.o6 (hrs) coefficient o.600 Hydrograph 3. 62' EARTNE SIDE`SLOPE FREEBOAR EMERGENCY AT ELEV. 552.33' DURING THE SPILLWAY WITH PROVIDES 00 -YR STORM;__:_ 2 1 1.072' I j 555 Culvert -------- -- - - - 10 -YR W E. -_..___________________-_1 time of conc. (hrs) 0.2200 -- -- -- -- ----- -- - -------- -- - --- - - - _ __--_'-1111_-- -- I --- --------- time limit (hrs) 30.000 length (ft) 1o.00co Orifice Orifice D (in) 24,000 - :551.96 W '-- h (in) 0.000 routed true , Residences Length WidthI-- t1p Residences Lenc�tll_.,._._ W3. th iia subtotal area (sf) o.o87 Length (ft) 244.000 peak flow (cfs) 61.028 time limit (hrs) 30,000 diameter or depth (in) 4.000 Slope 0.005 peak time (hrs) 11.967 I Rv t V t,,.... (fes width for rect. (in) 0.000 Manning's n 0,013 j O coefficient o.600 Inlet coeff. Ke 0.500 5.8" MAX 'ET invert (ft) 546.000 Equation constant set 3 Hydrograph 2 multiple 4 Invert (ft) 542.000 __. 1111-1111_- __-- _---.__-.-_� -_-_ _ ________1 ------ -- --__-- ----___ 1111_ __ - N - - \ _- - -- - v` ; __._. - ___- EMBANKMEN --1111_ - -_ _ --__ - - 1111 _ _ ----- _.--- --__1___1_,_________- O v CN 72.000 550 Weir • Type z i - I �- ,.-I^ i i New Devalopmetjt (FOI" tCfeV81(?ott1�E1�t Ar#�1, BatiStlti� itltlJ�I ti+r�uS dyer � 2�i°lob ......._...., __..__._....... _ .. ,c i EIG H H' s length (ft) 62.000 i time of conc. (hrs) 0.2200 volume (cy) 4086.372 550 I ` _ ____ ___ ` ___T __, T _ -- -2-Yt3.1t1tS __ __--_ ----- 12'MAX invert (ft) 552.330 i --� - - -_ __ _ _ y routed true STORM SEW R i peak flow (cfs) 129.669 = 548.10 peak time (hrs) 11,967 "Iiii,L z � volume (cy) 165o8.9o9 W. 1 i OUTF LL AN I W I i- - PONCIWG - ---- \ (- I F I X" .- 1111___ I 3 HR -� ----- - _._ - _ __ RiP P -_SEE___.__._._ _.f __JrL _ 1111._. . _ _. ._ __-_-_ DI=PTH ._ .-__. 1111 -_ _- _ _. _. __ _____--1111 _ .__ _ __ __ 1111_. _ ____..__ _�___ - ______ ._____.__ __ 1111_ _ _ -__--_-___-._-� i GRACING SHEET i D ORIFICE WDOwN , i - \ j mi j I I I 535 ( N I -- - -- '-- ----- 4-4"MlDFL(� i - -�. OF BMSIfV�--�__- ELEV�539.00 i 7 -a 0 _ 545 SOOTING 18"RSP I i 11DOT STD. - C-1 C ORi fCEST ` - 532 2.1 SIDE I ELEVI.539.5 1 545 I PES - _ 1111.__- i_.__- -__-._-i 1111___- __ __ r? - __ _- - 1111 _._--_T__-� _ i r._-- ..,_ ELEV. __-_ r__ 1111.__ .546.0`0 1111_-_ F 1111_-.._.,,� _- ta, 1111.__-_,_-- ---______t_-_._-___ ____._.__._ �_-__ RIPRAPi GEOFA BOTTOM OF i t �_ 1 i EXTEIsiDED DE ENTION POOL ' INV IN. 538.00 NDERLAYMENT �� 70B NO. o) FOR BAY - -'--11-11_ _..._�_.___�.._...__.. _. 1111._ .1111 __ -._ .-_-...__....._._,_._ _...--.__ � __ _.._..__._.,.___..---.-.__ _ ---_ ____.____ _ -1'111 __.__.__ l 1111-- 1111_.. . _.�..._.__ 1111_ _ ., -_-- 1111..- ., ___ _ 1111.. _ - __.__-_ _11-11 _._.._._ i ELE .542.0 AS SHOWN 2 c 0 0- �v a a o SHEET NO. UM. 0o OREBAY SPILLWAY i 3"-30H ' 24" RCP it 540 --- VDOT STD. EC CL. Al RIPRAP 1 B _-O TTOM -- -- BASIN -- DRAN-i ORIFIC RISE FOO --- BARREL ING L 244'; S _ _ _I _ 01.50% _ 1.54' S7t��-t---�,-*--- - 540 2:1 SIDE SLOPS E EV. 542.00 ELEV. 42A0 Ii�V !N. 5 2..00 : EX. 15" IVCP VDOT STD. 538 ELEV. 5x,35.50 $AN SEVER EC -1 L. Al 538 =10; D=0.5; L=6' RIPRAP W/ r, 00 04 a co a co ,o GEOF BRIC t` Lo 00 r LID n3. N n3. co ch UNDE LAYM NT to 4`n �� � U) L=13'; 1=6'; 2=19'; 10+00 SCALE: V:1"=5' H:1 "=50' 10+50 11+00 11+50 12+00 12+50 13+010 13+50 14+00 14+50 15+00 15+25 Technical Bulletin 7 Minimum Standard 3.02 I glial' .4d.. t' 8eet-ion 0/0- elia. 3100 v ca4 to W -i y} ectvxal 411 Z' :1--X .r' W_iar A 1/4 ?LOA rnaaaiscii - P Y9.. T 0 or a3. St+iatiana F3., . ��D t shi," with. 41ptkmla Prat* 00 H07 0, tolm ' PASM Sot etto'aa 3W, arrVWA a' eCT44 l i Jtr { , k , I \VD01 x3.31 '3.111'-f CHID ) ' I i f? 1 I 4 I ------ 1111_ I / - FIGURE 3,t1i - 7a 11omogenevus Enrhankrnents w1Neeprrgc Cownds ogerrerlus fiN 3.3.1 Kj` r_ m- ----- 1 ut off trench 4' Wow suftobie I mltetiol 1 S61 or rook > V L -_ _ - _-. _.. _- ._- _. - _..._ J TYPICAL HOMOGENEOU$ EMBANKMENT Transition NI ,-Rook or gravel I'3. outlet Co., .trxa 2% P4 riorat d eoeotor Foundation drain Blanket drain FOUNDATION DRAIN BLANKET DRAIN 0*" Moir Sand; qmd or reek Rack or grovel Rma to drain Transition fitter Transition finer CHIMNEY DRAiN TOE DRAIN / / / / / / / / / / / / ar CattinTnfiSab 1 _V1 E C �I €, crYrr 1111_ ., I, t'► �' .11; 6 DIM0i orf -S - :4 2.7 N1r 43 s -34 1. 9 f� * rpo 3 a,, 112 2._23 _2J. 37 i; ED 7-z 1 41 t t, 123. A$ ddL Area of �"�. / Elevation Basin. .1 $1 , 7k W M 3 A 6 4e, te�4 . ..- 542 5;311 f I 4. 111 1 �;x:53 5'13 / 32160' 1111-r 3 4 4ap Ott 72 80 Vii 75 3,48. ,r 1r2 96 t14 % &n11 routed true U 100 129 ki e ii­ Outlet structure o Curve peak time (hrs) 11.967 Hydrograph 2 ,, �. , I i �}* 'I - i43.r r n t4 -.V g / / / / / / / / / / / / ar CattinTnfiSab 1 _V1 E C �I €, crYrr 1111_ ., I, t'► �' RW 333;939:. Sf 2 -Year 10 -Year 13;914. df Post -Development (cfs) Predevelopment (cfs) 2T82.8 ct / 7.93 ,32,697 of / D.A. #1 Area of D.A. #1F11.43 / Elevation Basin. Vol1. ume (cf) Volume (cy) / 1 . (Sf). ✓I storage (cy) 2133..663 542 5;311 0 I 544' 81()6-111 1 �;x:53 5'13 / 32160' '1211. , 56;3()5 2086'. 550 15480' / 3`t 33: 1.552 17708, ,r 4361 64 2003117' 155,463 / time of conc. (hrs) o.3.600 routed true storage (cy) 4336.424 5 Outlet Structures Outlet structure 3 peak flow (cfs) 28.663 discharge (cfs) 4.892 at 12,16 (hrs) RW 333;939:. Sf 2 -Year 10 -Year 13;914. df Post -Development (cfs) Predevelopment (cfs) 2T82.8 ct D.A. #1 7.93 ,32,697 of 2.91 D.A. #1 Area of D.A. #1F11.43 name: 2 -Year 24 -Hour SCS Method Storm Elevation Basin. Vol1. ume (cf) Volume (cy) (ft) Contours 1 . (Sf). CN 72.000 storage (cy) 2133..663 542 5;311 0 0 544' 81()6-111 1 �;x:53 5'13 546x. 10802- 32160' '1211. 648` 12336: 56;3()5 2086'. 550 15480' 847579 3`t 33: 1.552 17708, 117;742 4361 64 2003117' 155,463 5758 Summary of Watershed 2 -Year 10 -Year Predevelopment (cfs) Post -Development (cfs) Predevelopment (cfs) Post -Development (cfs) D.A. #1 7.93 D.A. #1 2.91 D.A. #1 25.23 D.A. #1F11.43 name: 2 -Year 24 -Hour SCS Method Storm Totals: 7.93 2.91 25.23 11.43 VDOT STD. EC -1 CL. Al RIPRAP W/GEOFABRIC _..,.----.--.,.�---.-,-- UNDERLAYMENT t 1 Rile�i�` &M S�146SM141 L-13'; W1=6'; W2=19'; D=1.4' rar:m-".uanm mm mt,w' alma. 13.+ i nr�_A-i 11) t f%3. K" aawotopwb Awma 0As1 c4T&. 1 1 V__ (1) Wzf oma bdl,!, itil dtm 1 tJ l:=i**O,Dt,) lav, ,tf A� I r*,i1LfiiYoWTFW, W 04W Adam *1 4411, 9 -T F.W. ' I Q33K3' l 0mun# "tw :vr=ba•s-m _� 3.m b*.Am m -1 @ OAR .»j. -,..,.,___,___d......»...,. 3k�9'�t#^ix di?. .,44}+1F-x#Surean '8a� Elevation Sotftw:.5C.`r �Jighi",rhtk,`}'iekl..�r�ftfand '' K. BIW, I�i41'wwv"K r P7' i. 4.'GWJCa* - o y;. ,+fler C3.�r im+f kEF+ ,FY.aCGt (xitE`"t'.':rt+k'.rar0~d _ 11 1z,8F�n42$85 --1 7$01L9VC`7WS 20 3.r, » law 3.61-3 ,s t 1 R$* A Ot' IA 4� :W44Ya Vis- tai_ n- , WVDr. a im, ,.BI`P DEBRIS CAGEr a eoatea, as -. -7a- Precut Anti -Von Vel (Cap anti17A I .."r-4»-aa4.�bm3. _ , SWM FACILITY #z / /, / /,` j // // / / / / / / / / / / / / / / / / EXTENDED /' / / / .�. / / / / / / / / � / // // / / / / / DETENTION BASIN I/ Z / ' ' f / / / / / / / / / / / 10' EARTHEN EMERGENCY / D A 2 / ' / /// / '' '' /' /' II/ I // SPILLWAY AT ELEV. 54;2.5 - . / . �. / / / / / / / / / / ./. . / X. 1' / SCALE; // / / / / / // / / / / / . i VDOT STD. EC -1 CL. Al . / i / / / r / / / / / ' / / / -/ / RIPRAP W/GEOFABRIC / 13.1=2,0' �/ / / / / / / / // i. / / / /'. / / / / /i / / l / UNDERLAYMENT / _ / /' /�11- 1 L=9'; W1=4.5'; W2=13.5'; D=1.4' / ,-/ // / / / / / / / / / / , X . / . / * // // , / __1 j __ /' /' /' / / / f // / / NSfALL 3"-30HR DRAW OWN ' `-__ / 18" BARREL / - - ' / f / / / f / / / / ' /6RIFICE AT' ELF,V:53 X00::..: // L=150 ; S=0.5% // / ! / "" `` - \ / % / / / / / / / / AND 4-4 MIDL / INV iN: 538.00 / // ,' / /' // /' // / / / / / ' .IORIF'ICESAT EV. 540.00 / // IN`�GLlTt.537.25 // � / i / / / / / / / / . / (� / f; '/ / . / /' / / / / / / / / / / / / 14+0()l / // / // / // / / // _ / -- � f r / / / r , i / __ / E --- 47 / / / / / f / / / / / : / STORM ER r / / -- __ / X11111 ' / / ,/ / _-L- , / MANAGE FACILITY.#2 / / 1 i / / T E5 DETENTION PR POSED 24 RISER AT ELEV. 541.50 9 � '_-----.-.,-1111. x z / / / . �2 / / BASIN �- i _ r i J / / �-- , f f / / . / / i / r / i' / f / 11P 11 _� � _- D=1.4' SWIVI FACILITY rFXTENDED DETENTION BASIN i Basin Input Data Inflow Hydrographs Routing Method: storage -indication 8 Contour Areas 3 Inflow Hydrographs Hydrograph o Elevation(ft) Area(sf) Computed Vol.(cy) Hydrograph o 2 -Year 24 -Hour SCS Method Storm 542.00 58:moo 0.0 SCS inflow (cfs) 28.645 at 13..98 (hrs) 544.00 $106.00 513.1 name: 2 -Year 24 -Hour SCS Method Storm discharge (cfs) 2.911 at 3.2.56 (hrs) 546•oo 10802.00 1211.0 Area (acres) 23..670 water level (ft) 54$.096 at 12.58 (hrs) 547.50 12325.00 1853.0 CN 72.000 storage (cy) 2133..663 548.00 12$35.00 2085.9 Type z discharge cfs 1. 10 at 12.2 hrs 9 (cfs) 3 4 (hrs) 550,00 15480.00 3133.1 rainfall, P (in) 3.700 Hydrograph 1 552.00 17708.00 436:.•3 time of conc. (hrs) 0.2200 10 -Year 24 -Hour SCS Method Storm 554.00 20037.00 5758.4 time increment (hrs) 0.0200 inflow (cfs) 6o.993. at 11.98 (hrs) Start_Elevation(ft) 542.00 Vol.(cy) 0.00 time limit (hrs) 30,000 fudge factor 1.00 discharge (cfs) 3.1.425 at 12,34 (hrs) water level (ft) 551.962 at 3.2.34 (hrs) , time of conc. (hrs) o.3.600 routed true storage (cy) 4336.424 5 Outlet Structures Outlet structure 3 peak flow (cfs) 28.663 discharge (cfs) 4.892 at 12,16 (hrs) Outlet structure o Curve peak time (hrs) 11.967 Hydrograph 2 Orifice name: Anti -Vortex Device volume (cy) 3649.256 loo -Year 24 -Hour SCS Method Storm name: 3o -hr Drawdown Orifice multiple 1 1' factor applied to RR ppt inflow (cfs) 129.588 at 11.98 (hrs) area (sf) 0.049 invert (ft) 55x..330 Hydrograph 1 discharge (cfs) 126.408 at 12,00 (hrs) diameter or depth (in) 3.000 discharge into riser SCS name: 3.a -Year 24 -Hour SCS Method Storm water level (ft) 552.928 at 12,00 (hrs) storage (cy) 4988.412 width for rest. (in) 0.000 file: twentyfour.txt Area (acres) 21.670 discharge (cfs) 25.213 at 12.o6 (hrs) coefficient o.600 Hydrograph 3. CN 72.000 water level (ft) 542.935 at 12,o6 (hrs) storage (cy) 1341.528 invert (ftj 542.000 Outlet structure 4 Type 2 � - multiple 1 Culvert rainfall, P (in) 5,600 Invert Outlet structure 1 rt ft 8 000 {) 53 discharge into riser name: Barrel time of conc. (hrs) 0.2200 i Weir e Type 2 multiple 3. time increment (hrs) o.o2oo name: Emergency Spilllway Outlet structure 4 Outlet structure 1 discharge out of riser time limit (hrs) 30.000 length (ft) 1o.00co Orifice Orifice D (in) 24,000 fudge factor 1.00 W name: Mid -Flow Orifices h (in) 0.000 routed true , Residences Length WidthI-- t1p Residences Lenc�tll_.,._._ W3. th iia subtotal area (sf) o.o87 Length (ft) 244.000 peak flow (cfs) 61.028 time limit (hrs) 30,000 diameter or depth (in) 4.000 Slope 0.005 peak time (hrs) 11.967 I Rv t V t,,.... (fes width for rect. (in) 0.000 Manning's n 0,013 volume (cy) 7769.902 O coefficient o.600 Inlet coeff. Ke 0.500 AND S SNE 'ET invert (ft) 546.000 Equation constant set 3 Hydrograph 2 multiple 4 Invert (ft) 542.000 SCS ?:m 0 discharge into riser ,---.,------,e11-l_....1-_:1 name: loo -Year 24 -Hour SCS Method Storm 2 W `'` 1111 - Area (acres) 2x.670 KMEN'T - Outlet structure 2 O v CN 72.000 V/ I Weir 3..L W Type z name: Emergency Spillway New Devalopmetjt (FOI" tCfeV81(?ott1�E1�t Ar#�1, BatiStlti� itltlJ�I ti+r�uS dyer � 2�i°lob ......._...., __..__._....... _ .. rainfall, P (in) 9.100 ... length (ft) 62.000 time of conc. (hrs) 0.2200 volume (cy) 4086.372 side angle 78.46o I ` time increment (hrs) o,o2oo I _ . coefficient 3.300 540 time limit (hrs) 30,000 invert (ft) 552.330 i fudge factor 1.00 I multiple 3. y routed true D DETENTION discharge through dam L peak flow (cfs) 129.669 ....-. ____ . _ peak time (hrs) 11,967 "Iiii,L z � volume (cy) 165o8.9o9 W. Short Version BMI 1,P: !C1. _ ,utations For Worksheets 2: - t Albemarle County Water Prote ion. Ordinance: Modified Simple Method Plan- Westlake Hills Phase If -IV SIMI Factrw #1Waterkesour es Area: .uelopil,_-- w _. .__,._._.,. rr t t Arm Prepa KKw PE Date:. .hr P__ , ,. --. , ,�."., :.a, ___1,,,,.,.__. -- upx.�. -. 1-w 1,111,_. ,,,'-_ _ .,,.x_..__.,,.N_.. w.,:,�-,-","--,, .a...: -___.. ...-:04-Mar-14o" Project Prairlage Area Designation PRE -DA# 1 POST -DA# 11 L storm pollutant export in pounds, L = [P(Pj)RV/'12 ] [ C(A)2.72 Rv m1.an runoff. coefficient, Rv= 0.05 + 0.0091(1) Pi small storm carre bpn factor;: 0,9 I percent imperviousness P annual precipitation, 43" m Albemarle Pre Pest _ __ _ a A project area in acres in.subject drainage area; A 13,74i_ 21;67 .) __._,__ ,,.,.-_,_______,, ...,.___„ C potiuf1. apt coneentraiiO , mgll or ppm target phgspftorus f factor applied to RR V regulred treatment yp0me in ;cy, U.5" cover imperv. area= A(l)43560(0' 511 "2)/27 RR required removal , L(post) -'f:x L(pre) %RR rernoval efficiency , RR100/L(post) JnVe moUs C10, over Gompukatioi (values 16 fleet & square fse ) Iterri _. 1111 1111 ... ......__._ 11,11, ___. .y ,pre-dev�elopn n3. _ ...1111 __ _ . area 1111 ! 3.t develo merit_.._....-_._ __ 111 1.__ . _ . ._. `Area _ 1111 A -----p - --- - - __,_ ._ ._. _. _ . __ _1,1. _ .. . a Riiadway (includes C&G) � _ _ 11 .. ,, ,... _. _ , . __... __ _subtotallto#al F o way . (iriciud s C&C?) _ ..........._... ubfsatai .- .--.----, -- i r... -_--- _._-111_1 __._ -, ; .. ........... ..........:..__ ----; j -111.1... ,- ... 111,,..... 1.� 111111.111111- 1 7 Q2 2 10 B 2 x27 _.1-1111.11-1-111 I Residence Le 1 width ,no. no __„ ; subtotal.__._ Re den s 1111, Lein 3.h Wldtli no subtotal j Driveway i Driveway i ... , :Sidewalks iravelareas ,0 Actver grazed pas' 35 yards anti. cultivated ^ IAcUve prop; land D ------ _ 11:_1__1 ____ Roadway Sidewalk ire 28,� / / 10+00 10+50 11+00 1'1+50 12+00 12+50 13+00 13+50 14+00 / 1 i /' SCALE: V:1 "=5' H:1 "=50' yI61 0 A-"r[e*O-VA MIN01 I Z 14+50 14+75 invert (ft) 542.500 MIN i Short Version BMP Computations For,Woritsheets 2 - S t3rtvewa y 1111. 1111. 1 ...._,__r. _ _.. SWM. FACILITY # 2 Albemarle County Water Protection Ordinance:`ModifIed Simple Methiod EXTENDED DETENTION BASIN (2 W Q V) CHNIC L BU L LL 2 ETIN - # Sid Sidewalk I _ _ Plan .._ _Westlake,HilIs base 11 TV $WM Facility ... _ _. Water Resources Area . t_ . �,e,�rst �r I 1 Elevation Basin In Data Routing Method; storage -indication Basin put at Inflow Hydrographs hs Q Pre ar r 11:11 � _e-- 1111,-.....,._-.,, ...� _-P .--..- -,.. ,:.-1-1 11__ .1 1 11 __...._.. ----. Via_ Mar 14 __ _..... -.._,_..,.._.._...-1.__1:11 _ ---- . 1__ 1111_ .. ____ Hydrograph o 4 Contour Areas 3 Inflow Hydrographs _ 1111 _ __. 2-Year24-Hour SCS Method Storm inflow (cfs) 7.303 at 11.94 (hrs) El v don(ft) Area(sf) Computed Vol,(cy) 539.00 683.o.00 0.0 Hydrograph a P!'O`eGt Drairfa a ACE'S: Designation PRE DA# 2 Pt?ST DA# 2 i discharge cfs 1. 10 at 12.2 hrs 9 (cfs) 3 4 (hrs) 540.00 8034.00 274.6 SCS 2 -Year 24 -Hour SCS Method Storm "__ _ ' " ...." __. , .---------. 1-_--1.1-1__ , ., _ 1111 1111 ,._.._...,., 1111... lI water level (ft) 540.542 at 12.26 (hrs) 542.00 10488.00 958.6 Area {acres) 5.610 L storm pollutant e rt in r12 C(A)Z7 2 p mounds, i ' [F(p't) storage (cy) 442.020 544-00 13001.00 1826.9 CN 70.000 .Ry mean runoff coefficient, Rv = 0,05 + 0.009(1) Hydrograph 3. Start_Elevation(ft) 539.00 Vol.(cy) 0.00 Type 2 rainfall, P (in) 3,700 Pj small storm correction factor, 0,5 10 -Year 24 -Hour SCS Method Storm , time of conc. (hrs) o.3.600 I percent imperviousness inflow cfs 16.0 1 h (cfs) 49 at 3.94 (hrs) 5 Outlet Structures Outlet structure 3 time increment {hrs} 0.0200 ".. F annual precipitation; 43 In Albemarle. Pre Post discharge (cfs) 4.892 at 12,16 (hrs) Outlet structure o Culvert time limit (hrs) 30.000 A project area in acres in subject drainage area, A 917 61 '> water level (ft) 541.833 at 12.16 (hrs) Orifice name: Barrel fudge factor 1.00 9 1111 ._,11 11 _ . _,........ _ C pollutant corlcentratoh, 0911 car ppm target phcshorus storage (cy) 894.507 name: Low -Flow Orifices multiple 1 routed true 1' factor applied to RR ppt Hydrograph 2 area (sf) 0.04,9 discharge out of riser diameter or depth (in) 33.000 D (in) 18.000 P peak flow (cfs) 7.306 peak 11,938 VV required treatment volume in cy, 0,6' over imperv. area = A(I)43566(`Ci.5/12)/27 . loo -Year z4 -Hour SCS Method Storm width for rest, (in) 0.(000 h (in) 0.000 volume (cy) 854.250RR required rernoval , Qpost) .4 x L(pre) inflow (cfs) 34.934 at 11.94 (hrs) coefficient o.6coo Length (ft) 15o.000 i i I%RR removal efficiency , RR1001i,(post) discharge (cfs) 25.213 at 12.o6 (hrs) invert (ft) 539.000 Slope 0.005 Hydrograph 3. I H 2:1 water level (ft) 542.935 at 12,o6 (hrs) storage (cy) 1341.528 multiple 1L Manning's n 0.013 dischar e into riser Inlet coeff. Ke 0.500 9 SCS 10 -Year 2 -Hour SCS Method Storm 4 1, ervxius Cov+sr Computation values in feet '& a utare feet __ _ _---- _--,',.__._._. 1-� .-.-- --.. __ .a_._ !� ,-- - _. ,--,-,__ . --,- r __._w_�I_-,- ._-�._.__ ,-,--__._...._.._-,---...,___-.....__-_..._..__ .___._.... _.->.._, ,-- _...,___.___.________ "-------_.- .. 1111. __.._,__ item I. � - Equation constant set q 3 Area (acres) .610 ea (a ) 5 1111 .r.._. a w ...... ......... .. . 1111.. 1111... ...._.....ri .�..,, _.......... 1111. 1111_ . 1111. 1111 1111 r .. 1111.__ ,.. 1111.. 1111_., .<. ,...�1_1-1.1-1-1111-1-1-11 _ ... .:....1.111-1--_._. Y .. _ .. . Uj Invert Outlet structure 1 rt ft 8 000 {) 53 C N 0.000 7 re leve 0 meat l °Area ost develo n l file t p.. _ _ . _. 1111. , p.. 11:11 _..,.... , ._. _ ..� , ... _, 1111 _., . _ _ 1111 1111 1111 ... __ 1111 . 1111 Area 11..,..,.. �?..,.. _., 1111 ... ... ............................. . 1111_., rainfall, P (in) 9.300 i Weir e Type 2 1 , . 1111.. „_ 1111 _.. Roadway (Includes C&G) v - -b _ al Roadway (includes C IG) subtotal SIDE FREIEBOAR name: Emergency Spilllway Outlet structure 4 rainfall, P (in) 5.600 i ! _ r 1.065- length (ft) 1o.00co Orifice time of conc. (hrs) o,1600 _ 1111 i " ` "' ""' 4 3 0 16 9 6: 1cO 3 931 t :;. 30% W 4 name. Mid -Flow w Orifi side angle o ccs e 8. 6<o 9 7 4 r 0200 ti me increment h s o. ( ) , Residences Length WidthI-- t1p Residences Lenc�tll_.,._._ W3. th iia subtotal i I coefficient 3.300 area (sf) o.o87 time limit (hrs) 30,000 , .,_, _subtoi „ 11-1-1_ / / 10+00 10+50 11+00 1'1+50 12+00 12+50 13+00 13+50 14+00 / 1 i /' SCALE: V:1 "=5' H:1 "=50' yI61 0 A-"r[e*O-VA MIN01 I Z 14+50 14+75 invert (ft) 542.500 MIN i " EQ D. '�lVQV - 4 t3rtvewa y 1111. 1111. 1 ...._,__r. _ _.. T TRASH ORIFICES RACKS b T PER V BINSTALLEDON E MHT CHNIC L BU L LL 2 ETIN - # Sid Sidewalk I _ _ i I 1 Elevation Basin i discharge through dram coefficient o.6 c e t oo peak flow (cfs) 16.057 Homme ..:..... (3 09 1 fomes _ 1111 _ __. x - 9 9 cf 1 ` peak time (hrs) 11.938 Gravel areas Area .. I. I .1­1111I'L- Gravel areas Area . 25,881 � Outlet structure zmultiple 4 volume c 18 o ( ) 4 Y 77 3 1111 1}.701. i � 1..7, 550 ( W V Q ROVID - -COEFFICIENT D 7414cf , O IFICE0. � 6 I SCS i______ __ ,..n_.-._....__,,,_, _._.._.,.-, ..: _., . 399 445 x 0131 ,_.m . -- ,,-,--,-......... f . .. ,m...,._. 1:80 221; x 0.08 = 24 RG�P "" WIRA I11 RISER �' AT'ELEV. 11 RE�TE7tNTI�jTCSE 41.5 0 f} XT loo -Year 24 -Hour SCS Method Storm 554 _..v,, Active crop' land --___N___________- w.._. _A _ . 1111. 1 i I \ discharge i nta riser I - 100-IYR EE i I i I WS j --- -- I 4r4' F --'---C E MID I RT EV. 54 LOW AT - I - i � i i TOP _ 10' I � OF DA __-_� ARTH EI I WIDT -------- N EMERGENC i r r =10 A ELEV. 544. oa _1111_-_ _-_ Y SPILLWAY WI i r I H 2:1 0 545 Type 2 � - - - � - 542.935 Uj , I E - rainfall, P (in) 9.300 .00 � 11.1.1 .. , t. .... _ .;._.,,. SIDE FREIEBOAR SLOPES AT ELEV. DURING 542.50 PROVIDE THE 100-Y STORM R R r 1.065- 545 ST OR SEW E t :;. 30% W 4 I = I 541.83 i I I Y I I �i time limit (hrs) 30.000 I Rv t V t,,.... (fes 2.7 M O RIPRAOUTF RIPRAR GRADING AND S SNE 'ET 0 114 OO _ _, -2-YR = 540.4 ?:m 0 j 5 M PONDING ,---.,------,e11-l_....1-_:1 2 W `'` 1111 - EMBA HEIGHT KMEN'T - - O v 540 1 V/ I Jam. 0-s_ 3..L W j i New Devalopmetjt (FOI" tCfeV81(?ott1�E1�t Ar#�1, BatiStlti� itltlJ�I ti+r�uS dyer � 2�i°lob ......._...., __..__._....... _ .. _ ... , DEP`�H volume (cy) 4086.372 C f I (pre) * Rv(pre). ` L(pre) I ` �� I _ . 540 - i .. _ ..- _... ...__._ 17% De Io/}ra nt Area I w 1 y XTEND D DETENTION PO L 1...,111 1 -1 1I 11 .,_ _ 1111 _ r 1111_._ ... ___. ....-. ____ . _ �z "Iiii,L z � W. 1 i w 0 w i----------]- W I i- - I _ _ _ -- -1 - ---- - --- -- ----- F I X" .- 1111___ I 3 HR -� ----- - _._ - _ __ . _ - _. � �` --- _- __ _- '-. _ o, J c BOTTOM OF i FORt I BAYS I ILLWAY i i I BOTTOM , 0-,, 'o 0 D ORIFICE WDOwN , RISER ' j mi j I I I 535 ( FORT ELEV, AY 539.00 VDO'f ; CL. AI STD. RIP _C_1 i - - OF BMSIfV�--�__- ELEV�539.00 I 7 -a 0 _ ---____.� SOOTING 18"RSP I II 11DOT STD. - C-1 C Al ! _-_ _ 535 532 2.1 SIDE I ELEVI.539.5 SL I PES C -N <n a I i I i BARREL 3. L=1501,` S=0.5 I % RIPRAPi GEOFA W/ RIC 532 WCom? E W=6; D=0.5'; L=4' 0" INV IN. 538.00 NDERLAYMENT 70B NO. o) o U-. C) M o INV OUT. 537.25 ,- =9'; W1=4.5'; W2=13.5; D=1.4' 0) LO u3. ICT LO 0i`t co"Cr LO 6 `- L 4 co L LO SCALE0 / / 10+00 10+50 11+00 1'1+50 12+00 12+50 13+00 13+50 14+00 / 1 i /' SCALE: V:1 "=5' H:1 "=50' yI61 0 A-"r[e*O-VA MIN01 I Z 14+50 14+75 EXTENDED DETENTION FACILITY DATA' Total. Proposed Clontributing Impervious Area= Water Quality Vollume= Minimum 2xWat r Quality Volume Required= Water:QUality Vollume Provided= Area of Elevation (ft)Fore ay Volum (cO Contour( (sf) 53 184$ 0 540 2276 2,058 73,969 sf invert (ft) 542.500 diameter or depth (in) 4.000 fudge factor 1.00 t3rtvewa y 1111. 1111. 1 ...._,__r. _ _.. Driveway ; :^ _ 1111_., _ _ 1111, __ 1111 , _ 4.89 multiple P width for reit. in 0,x00 { ) r routed true Sid Sidewalk I _ _ i S dewalks Elevation Basin i discharge through dram coefficient o.6 c e t oo peak flow (cfs) 16.057 Homme ..:..... (3 09 1 fomes _ 1111 _ __. 3,(30()I'll 38 $0,00C 539 6811 0 invert invert (ft) 540,000 peak time (hrs) 11.938 Gravel areas Area .. I. I .1­1111I'L- Gravel areas Area . 25,881 959 Outlet structure zmultiple 4 volume c 18 o ( ) 4 Y 77 3 1111 1}.701. 1)) x,3.3 7(7 1..7, Curve discharge into riser name; Anti -Vortex Device Hydrograph z _. ... . . ... . ..._. ,. ,x .. VvfloCis, brush, C r SS Area ___ ....111,, � 111 1 ... _. . -, `Actively -grazed pasture & 1111 ..,,., 11.11 1111. Area _ .11- 111 _ ...:" multiple 1 SCS i______ __ ,..n_.-._....__,,,_, _._.._.,.-, ..: _., . 399 445 x 0131 ,_.m . -- ,,-,--,-......... 3;9941 arils and wit)vated turf , n_,- _. . _ ..m.._ Y,_ ,_ ___M_ _.. _, .1111 M . .. ,m...,._. 1:80 221; x 0.08 = 14,81,E Invert (ft) 541.50(0 loo -Year 24 -Hour SCS Method Storm `Active crop land Area _..v,, Active crop' land _ _ . , .. ... 1111. Area w.._. _A _ . 1111. discharge i nta riser Are (acres) 610 Area { } 5 x 0 25 0) x025. 1 N3 file: twent our.txct '-- CN 0.000 7 u,.., _ „_ ,_ _.. Roadway Sidewalk , R wa SI arae k y { I subtotal oad r S dews k R � ,ray 1 > subtotal 0 Type 2 i Uj 0-6 �.. o 6 � z cc rainfall, P (in) 9.300 f,,,,.. _.,._........, f1 1 ,,,,, , ,,,,,,,,,.,...-,,.,.,.,....,.........._,....,, 11.1.1 .. , t. .... _ .;._.,,. 2 5 1. 4 1 ', `� _,,: . 1111_ ,. J time of conc. (hrs) o.3.600 Impervious Cover r 1°tor ` t :;. 30% W �0 °w offawm time increment (hrs) 0.0200 I--! y'._ :'ti..,,: 1(pre) 4_.,_.: I(Post) W �- i H W time limit (hrs) 30.000 I Rv t V t,,.... (fes O 0 fudge factor 1100 0 114 OO J z0) ?:m 0 routed true ,---.,------,e11-l_....1-_:1 2 O 00 U m Tz peak flow (cfs) 34.950 O v V/ I Jam. 0-s_ 3..L W a -� ° a - O peak time (hrs) 11.938 New Devalopmetjt (FOI" tCfeV81(?ott1�E1�t Ar#�1, BatiStlti� itltlJ�I ti+r�uS dyer � 2�i°lob ......._...., __..__._....... _ .. _ ... volume (cy) 4086.372 C f I (pre) * Rv(pre). ` L(pre) L(post) RR % RR Area T pe -o .. 11 11 . < 11 `'% s I �` gr23 12 95 , _ ......,_ -, ._.:....... 11 10 13.&1 .. _ ..- _... ...__._ 17% De Io/}ra nt Area __. _... _ D y 0 eu /.r a ,.ru _r ....F r : 1111__.-.- _..._..... _ _.. 1...,111 1 -1 1I 11 .,_ _ 1111 _ r 1111_._ ... ___. ....-. ____ . _ EXTENDED DETENTION FACILITY DATA' Total. Proposed Clontributing Impervious Area= Water Quality Vollume= Minimum 2xWat r Quality Volume Required= Water:QUality Vollume Provided= Area of Elevation (ft)Fore ay Volum (cO Contour( (sf) 53 184$ 0 540 2276 2,058 73,969 sf 2 -Year I 10 -Year Predevelopment (cfs) 3;082 of D.A. #2 5.40 Z,164 cf 1 1.31 D.A. #2 17.37 D.A. #2 4.89 7,414 cf 1.31 17.37 4.89 Area of 4u Elevation Basin Volume (ft) Contours (cf) (cy) (Cy) (Sf) V U 539 6811 0 0 540 81034 7,4:14 275 . 10486 25,881 959 544 1.3001 49,325 1,827 Summary of Watershed 2 -Year I 10 -Year Predevelopment (cfs) Post -Development (cfs) Predevelopment (cfs) Post -Development (cfs) D.A. #2 5.40 D.A. #2 1 1.31 D.A. #2 17.37 D.A. #2 4.89 Totals: 5.40 1.31 17.37 4.89 vly I o�p � i �' . a ,l QSCOTT R. COLLINS'Z U No. 35791 ,ILI �0�AI_0'1�1,0�NAL,kt� )41 ���01 z O n - W U uZ LU 0 z C? H V) > UJ 0Y z w Q a� M U) H UJ ce "I- - 'w ���o ,1 L9 zz z CY) L] UJ 4u H W r- H V U 5 UJ UJ z O > UJLU ca U) L � z 0 w wui 0- z U a- o LIJ z (D Ce LL n (n ININAM N LIJ 19d - It uJ Lu>> 1..7, cl� ce 0 Q "I- - 'w ���o ,1 L9 CY) /M 3."i ININAM N 19d - It � M CL 0 Q 0 W 0) CL N Q o N3 '-- Q) V) W > W 0 0 Uj 0-6 �.. o 6 � z cc z J z �W J z ` F--11 H W �0 °w offawm U) I--! W �- i H W a z 0 K --I -0 U L9v- O 0 W OO J z0) ?:m 0 2 O 00 U m Tz O v V/ I Jam. 0-s_ 3..L W a -� ° a - O s_ (0V) (1)O L Q X W°Q) -o F....1 TT 3: = a 0 Ul D y 0 U) WC) �z "Iiii,L z � W. w 0 w W - (� (3.i►." W F o z •0 wU U cov! U) W '-. _ o, J c J �- 3: O O U U , 0-,, 'o 0 >1 6 mi W a a r <0-=o O c //�� (9� 7 -a 0 O- N U 0 U NO N C -N <n a Lu o n O UF- w 1-- c -a E WCom? E 0" un -a . 0 70B NO. 0) c 112072 o co U) SCALE0 . u' -o AS SHOWN 2 c 0 0- �v a a o SHEET NO. UM. 0o H 3 _ - , ,/ \/�// "�� [jrI :/.1 / ,��������� *:. / / 7 SWM FACILITY #3 -- -_--- FORE -BAY-- "` ,' ; ,,C X , �\ EXTENDED ---__--"-_ ,/ .' / ;/' ,/' \ \ DETENTION POND ---/ \ t 1- / / r'/ .A. \ `, / / 1 / \\ \\\ ! \ \ CALF' 1i = 70, `\ -1 � _ !/ 1 1 \ \1 =0 1 ,i - p "- / , , \ \\\ \ \ j \ -o i I \\ \ \ \ �-, - i ! \ \ \ \ \ \ \\ - / /..: . 1 / \\ \\ \\ ?�{ \ \ \\ \\ \ \ / / / . \ \ \ ' \ \, \\ \, \ \ � . --= �EARTHEN-EMERGE / / \ \ \ t' RiPRA\P � ET PlROTECTIQN SPILLWAY AT ELEV 8 1 ... / / \\ \\ t SSE UftA6)N 'SHEET \\ \ � / t --- �%: / i \ ;, � \ \ \ \ \ ;f. ! / / / \ \ \ / / / \ \ \\ \\ \\ \ \ 1� FOREBA\Y SP`II,�LWA \ _ / 11 \ \\ \ \ \\ \\AT ELEV 544.0 \ \ \ \ t _ / ::, / / \ \ + / \ \ \ \ \ \ \\ \ \ \ "' � : / / \ \ \,' \ \ \ \ \ \ \ \ / 1 ` \ X \ - \ \ \ \ \ \ \ \ \ \ \ 1-1.�',, ` S ORMWATER MANAGEMEN - / / \ \ \ r v A TY F CILi #3 \ \ \ \ \ \ \ \ < ! / 1 \ \ \ \ \ \ \ \ \ \ \ \ \ \ t EX FENDED DETENTION BAS! \ \ \1 \ \ \ \ \ \ \ \ \ \ \ / \ . \ \ \ \ \ \ \ \ \ .1 �' f \ �\ \ \ \ \ \ \ \\ . \ \ \ �� // 11 1 4 !\ 1 i t \ \ \\ \ \ \\ ` \ \ \ \ \ \� , / \ \ \ \ \ \ \ / �\ \ \ \ \ \ \ \ \ \ \ \ / \ \ \ \ \ \ \ \ \ \ \ r' l \ \ \ ! \ i \ \ \ \\ \ \ \ / / 1. I \ / I I i 11 1 i \ \', \ \ \\ \\ \ \\ . \ . \, / / I ! l I \ , \ \ \ \ - I / i I i 1� \, , t \ ! \ \ \\ \ \ \ \ N / / , \ I/ // � ,! \ \\ 1 `11NS4jALL'3" 3d,HR i O I'll! \ ? // r ,� / ) ORIFICE IAT ELEV. 4 .0 . / / 1-1 / // // \ ! i � t AND 4-4 �/lID-F'LO 1 \ - �\ PROP � " RI I'Z A �V. 547.17 / "I �// // / /� it �' ' ORIFICES AT ELE 15 4. l0 t1 \ \ :,\. ....... Q / >::.:.: / �� / / / } ; i I I \ .n I / �i / / r / } I I I 1 . �,' .... / / / ! i I I I I I 4 \ ,. \ 0 18 BARREL ! ' i / / / I I I i ' ; ` .. .. L=110 ; S=0.5°lo f I l ` INV IN: 540,00 1 ". / � / / i I I i I \ , ; \ \ � \ V OUT: 539.45 / .. " / i i i ! \ �. / / r / y / / / /�, / / I �. -,­_j-�.,::�_�', I \ \ . " �,,:!;.'I --, � I N\ \ / l ! \ 1 I / / / // ..,.4 i / / \ / / 11� / i \ / , .'r. ,. I / \ �" - // / //y: / 1 / // �......,../ / / / / / / � ,_ --' / / 7 . / / 1 i ' \ `-moi I`;.,./:,'` . / / \_ __ / / i/ \ ` ,'t''''. %..,..' ./� r / / / EXTENDED DETENTION FACItI 11»il Y DATA: / / / 90 Total. Proposed Contributing Impervious Area= 175,989 sf / / / j I/VDOT STD. EC -1 CL. 1 ",1,. I/ RIPRAP W/GEOFABRIG Water Quality Volurr* 7,458 cf / / UNDERLAYMENT/ MiniI'llrrlum2xWater Qualify Voltame Required= 14,9'16 cf , L=16; W1=4.5;;*2=13.5'; D=2.5' W, titer Quatity Volume Firouided= 15,625 of / / � / O00 / / Area of Area of /' �' " 00 1/1 Forabay V time cf Elevation Basin Volume cf Volurrie e " Elevation (ft) Contours of ( ) (ft) Contours () (y) (5f) (fit ? X58 0 2 5148 0 0 544 887 1,322 ', 6948 I2,(IS1 445 54.4.5 1314 1,796 544.6 75.61 15;625 579 546 14 9: 3,627 546 -,:w '?7,392 1,015 548 10484 46,I83 I,7I0 55th 12'{95 68,841 2I-,550 Summary of Watershed 2 -Year 10 -Year Predevelopment (cfs) Post -Development (cfs) Predevelopment (cfs) Post-Development(cfs) A. #3 6.99 D.A. #3 2.47 D.A. #3 DLTo 23.61 D.A. #3 20.29 tals: 6.99 2.47 23.61 20.29 SWC FACILITY ._# '' / f d+ / // / / / % // / / / EXTENDED // / / ;� /' / / / / /, / / DETENTION POND / / / // // / /' / / / A. T STD. E� -1 CL Al / VDOT / SCALE: / RIPARAP W/GI OFP�RIC / / 40 J / Ui�DERLAYMEN ? l t / / 1"=20' / L�lT; W1= 'rl W2419; D= �4' / A / t / / F i I l r� � ( (( / / ' 11 / __ // / i I / 11 S�EARTHEN E�ERGEI`k / / // I I � PILLWAY AT.E�LEV. 58; .0 / �/ / / so 1, , � \�` \ � � � / / 1 G ORIFIC AT ELE... 76 \a�/_�� = RACK., TO BE l ! F W ALL ' i. \_AN"iD t 1 , A 1 E ORIFI , ... / \, I I ORIF14ES PEP, VSMH1TECHN�ICAL 17:0.5 BQLLETi� 550.00 12195,00 #7 rainfall, P (in) 3.700 1527.1 W/H NSON CONCR Start Elevation(ft) 542.00 TE 1 time increment (hrs) 0.0200 776 1168 1 ORIFI E COEFICIE 0.6 ! 3,280 12 t routed true -_----_._.__.' 8,814 A1VT1 VORTEX TRAS 1., = �__ 5 Outlet Structures __.___-__� 555 r Outlet structure o O cru Curve MINIREQ'D. t \� 1 ~� �'_ i / '\ i= T P OF AM WI TH=10'1 diameter or depth (in) 3.000 i ' l � `yam_- cf 25 cf 1 1 4'-4" MIDLOW invert (ft) 542,000 Outlet structure 4 A 2 ELEV.1550.00' ' EARTHEN ll ERGENCY \ �.:,'� - {BAY ' ^. - _ -/ Outlet structure 1 I .. '. = �s� _i -YR WSE W, -- SE ( AT -- - - I SiDE SL,NP S A ELEV. '548.17 PROM ES 1.0 550 STOR _ SEW Hydrograph 2 __ --__ , � E V E 4 5 11 I .5 0 _ .':: ,:: _ F � EB E OA 'RDD 8 -"AX .� 100-1(R i - ST�R 1 �50 , --� _ �. , LL AN multiple 1 rainfall, P (in) 9.100 1 E 8, time of cont. (hrs) 0.1800 �i ' - ()UT.L� ROTECTi ,...:.: . EMB I HEIGHT NKMENIT __1 ... _ EE IE ,. `'.. side angle 78,460 i.- _ - '. _ kE ;� - _ _ \ multiple 1 ---i _ _1 r - ___ -` -,. -,_. . , .. ,... ;: w _----_--- U I ' EAFRT,,HEN WITHI 2:11 GRAD! 545 G SHEET SPILLWAY AT EL V. , DE � TH i j i 1 _ . _ -_ _ `_ `\ ____ -`_� ______ _ - _ _, _I --- -_ 545 BO TOM' EXTENDEDDETENTiON FACILITY DATA `Total Proposed Contributinc Invervmous Area= Water Quality Volume= Minimum. 2X Water, Quaiity Volume Required Water Quality Volume Provided= .Area Of Fclrebay Elevation (ft11 ) Contours Volume (cf) (5f) 57 140 0 578410 526. Sao. 8101.724 X1.25 1121 2,926 SCALE: V:1 "=5' H:1 "=50' 10+00 10+50 11+00 11+50 12+00 12+50 13+00 13+25 SWM FACILITY #3 EXTENDED DETENTION POND(2WQV) Basin Input Data TRASH RACK., TO BE INSTAIrLED O ALL ' 542.00 5148.00 0.0 1 24" RCP Ill RISER A ELEV, 547.17' Area (acres) 11,870 546.00 8348,00 1014.5 ORIF14ES PEP, VSMH1TECHN�ICAL 17:0.5 BQLLETi� 550.00 12195,00 #7 rainfall, P (in) 3.700 1527.1 W/H NSON CONCR Start Elevation(ft) 542.00 TE 1 time increment (hrs) 0.0200 776 1168 555 ORIFI E COEFICIE 0.6 ! 3,280 12 t routed true -_----_._.__.' 8,814 A1VT1 VORTEX TRAS RACK_______ 5 Outlet Structures __.___-__� 555 r Outlet structure o O cru Curve MINIREQ'D. WQV 1 I ! name: 3o -hr Drawdown Orifice multiple 1. T P OF AM WI TH=10'1 diameter or depth (in) 3.000 i ' width for rect. (in) 0.000 WQV P (2x) = 14,916 OViDED = 15 cf 25 cf 1 1 4'-4" MIDLOW invert (ft) 542,000 Outlet structure 4 A 2 ELEV.1550.00' ' EARTHEN E ERGENCY SPILLWAYIWITH multiple 1 2 Outlet structure 1 discharge out of riser 100 _i -YR WSE W, -- SE RIFICE AT -- - - I SiDE SL,NP S A ELEV. '548.17 PROM ES 1.0 550 STOR _ SEW Hydrograph 2 . 2' 1 E V E 4 5 11 I .5 0 multiple 4 F � EB E OA 'RDD 8 -"AX RING THE 100-1(R i - ST�R 1 �50 OUTF LL AN multiple 1 rainfall, P (in) 9.100 1 E 8, time of cont. (hrs) 0.1800 �i discharge into riser time increment (hrs) 0.0200 EMB I HEIGHT NKMENIT I side angle 78,460 - RIPRAP-SEE­--- AT El�E' kE -546 0f?NDtNG \ multiple 1 ---i --W -- --- _----_--- U I ' EAFRT,,HEN WITHI 2:11 GRAD! 545 G SHEET SPILLWAY AT EL V. , DE � TH i j i 1 .' -`_� ______ 84.040' DURRN 545 BO TOM' BOAR F- -- ---- EXTEN ED = IEL ��FO ° THE 100 - -YR Sl F ' i ORM I EBAY 585 -i __ DETENT - ON--\ -YR SE ' _ � I _____I___ ! �- 585 V. 542 J� 10' MA - -- - --Po _- -- -- _ _ ___ i i - flT-s D. TOM 3"- D 0HR WDO 540 FOREBAY IPILLW STD. ;EC -1 Y BO N -I- ` i _._.�-.--__ I __ -_.-----4..-______, 9.4 MAX EC R -1 CL, PRAP 1 / 540 I __VDOT CL. 2:1 k1 RIPRAP IDE SLOPES _ 0 EL I Ill SIN V. 542.0 ORIFICE—- EL IFICE V. 542 00 ( ( - HT i -GEOFABITFC U DER YMEN _-ELE W=10'; ..544.00_T___ -_---- D=0.5'; L=16 N l I FOO _____­ IND -__-__1 71' ST SDR PVC SiS - 5_._ � - c U ° X N U-16; \ W 2_=T3,5' =4.5'; D=2.5' 5 35 T Ur DETEN6ED 18 I CP 11 ► SE �R W o �1 535 IU) Q Q) w t-- E n� 575 ° 1 0 Q i 112072 \ - I L=1 0,.S =0.�0/° 0 W 6 (n 7 0 ,n SCALE j F E REBAY' EV. 57 I .00 532 SIN � R#SER FOOTING I SHEET NO. ! INV N. 540.10 / MENT 570 ------- 1 _____-__.____._. Y SPILLWAY TD. Ed RjIPRAPj -1 532 __576_0 i -30HR _ __..___r_______I-._ WN j j INV OUT. 539.45 __.,_,____________ n RCP SEL; l = L- �II W�-19 �- _______-_ ; W 3, 1 - ' , D�1.4 i '• 6, ' 570 (o Ln o o `M, (O E RIFICE, EV. 57 LO M L lqt L0 2.51% SCALE: V:1 "=5' H:1 "=50' 10+00 10+50 11+00 11+50 12+00 12+50 13+00 13+25 SWM FACILITY #3 EXTENDED DETENTION POND(2WQV) Basin Input Data Inflow Hydrographs 6 Contour Areas 3 Inflow Hydrographs Elevation(ft) Area(sf) Computed Vol.(cy) Hydrograph o 542.00 5148.00 0.0 SCS 544.00 6948.00 446.3 name: 2 -Year 24 -Hour SCS Method Storm 54450 7351.00 5787 Area (acres) 11,870 546.00 8348,00 1014.5 CN 71.700 548,00 10484.00 17:0.5 Type 2 550.00 12195,00 2549.7 rainfall, P (in) 3.700 1527.1 (00 time of cont. {hrs) 0.1800 Start Elevation(ft) 542.00 V0L(cy) o.00 time increment (hrs) 0.0200 776 1168 time limit (hrs) 30,000 0 57'0 fudge factor 1.00 3,280 12 t routed true 3411. 8,814 peak flow (cfs) x6.359 581.5 43361 peak time (hrs) 11.970 5 Outlet Structures Outlet structure 3 volume (cy) 1969.6o1 r Outlet structure o O cru Curve Hydrograph 1 Ori{ice name: Anti -Vortex Device SCS name: 3o -hr Drawdown Orifice multiple 1. name: :o Year Hour SCS Method Storm area (sf) 0.049 Invert (ft) 547,170 Area (acr (acres) 11.870 diameter or depth (in) 3.000 discharge into riser CN 71.700 width for rect. (in) 0.000 file: twentyfour.txt Type z coefficient o.6o0 Outlet structure 1 rainfall, P 5 invert (ft) 542,000 Outlet structure 4 hr .3.0 time of cont. (hrs) 0.1800 multiple 1 discharge into riser Culvert name: Barrel time increment (hrs) 0.0200 fudge factor multiple 1 time limit (hrs) 30,000 Outlet structure 1 discharge out of riser fudge factor 1.00 routed true Orifice D (in) 18.0oc i h (in) 0.000 peak flow (cfs) 34.992 name: Mid -Flow orifices coefficient o,600 peak time (hrs} 11,970 area (sf) 0.087 Length (ft) 11o.000 volume (cy} 4213.074 diameter or depth (in) 4.000 Slope 0.005 invert (ft) 584.000 width for rect. (in) 0.000 Manning's n 0.013 Hydrograph 2 coefficient 0.600 Inlet coeff. Ke 0.500 SCS invert (ft) 544,500 Equation constant set 3 name::oo-Year 24 -Hour SCS Method Storm multiple 4 Invert (ft) 540.000 Area (acres) 11.870 discharge into riser Curve CN 71.700 I.11 }- name: Anti -Vortex Device Type 2 Outlet structure 2 multiple 1 rainfall, P (in) 9.100 Weir Invert (ft) 582.5oo time of cont. (hrs) 0.1800 name: Emergency Spillway discharge into riser time increment (hrs) 0.0200 length (ft) 20.000 file: twentyfour.txt time limit (hrs) 30.000 side angle 78,460 fudge factor 1.00 coefficient 3.300 AT El�E' routed true invert (ft) 548.170 :2 peak flow (cfs) 74,613 multiple 1 peak time (hrs) 11.970 discharge through dam Q) �_- °v volume (cy) 8983.463 160,968 sf 2 -Year 10 -Year Predevelopment (cfs) 6,70.7 cf Predevelopment (cfs) Post -Development (cfs) D.A. #4 1 13,414 cf' D.A. #4A 1 4,19 D.A. #4 1 24.80 D.A. #4A 1 11.72 13,649 cf D.A. #46 1 11.69 Totals: 7.06 4.77 Area of 23.41 632.4 Elevation Basin Volume (of) VolulTne (ft) Contours 1527.1 (00 Hydrograph ( inflow (cfs) 18,353 at 11.98 (hrs) Start_ Elevation(ft) 6.00 ( 57 776 1168 0 0 57'0 2163 3,280 12 t 5> 3411. 8,814 3:26 581.5 43361 13;649 .506 5624805 diameter or depth (in) 1000 17,075 632- width for rest. (in) 0.000 5024 27,88.1 .1,033. 586 7349 41,232 1,527 Summary of Watersheds 2 -Year 10 -Year Predevelopment (cfs) Post -Development (cfs) Predevelopment (cfs) Post -Development (cfs) D.A. #4 1 7.06 D.A. #4A 1 4,19 D.A. #4 1 24.80 D.A. #4A 1 11.72 D.A. #413 1 0.58 D.A. #46 1 11.69 Totals: 7.06 4.77 1 24.80 23.41 SWM FACILITY #4 EXTENDED DETENTION POND (2WQV) Basin Input Data Routing Method: storage -indication 7 Contour Areas Hydrograph o Elevation(ft) Area(sf) Computed Vol.(cy) 2 -Year 24 -Hour SCS Method Storm 576.00 si68.00 0.0 inflow (cfs) 8.446 at 11.98 (hrs) 578.00 2163.00 121.5 discharge (cfs) 0.581 at 12.80 (hrs) 580.00 3418.00 326.4 water level (ft) 581.371 at 12,88 (hrs) 581.25 4336.00 5055 storage (cy) 525,038 582.00 4805.00 632.4 true 584.00 6024,00 1032.6 Hydrograph i 586.00 7349,00 1527.1 10 -Year 24 -Hour SCS Method Storm Hydrograph 1 inflow (cfs) 18,353 at 11.98 (hrs) Start_ Elevation(ft) 6.00 ( 57 Vol.(cy) 0.00 Y discharge (cfs) 11.698 at 12.10 (hrs) 5 Outlet Structures Outlet structure 2 water level (ft) 583.348 at 12.10 (hrs) Outlet structure 0 Culvert storage (cy) 892.152 Orifice name: Barrel 0,2100 name: 3ohr Drawdown Orifice multiple 1 Hydrograph 2 area (sf) 0.049 discharge out of riser ioo-Year 24 -Hour SCS Method Storm diameter or depth (in) 1000 D (in) 24.000 inflow (cfs) 39.606 at 11.98 (hrs) width for rest. (in) 0.000 h (in) o.000 discharge (cfs) 36.972 at 12.02 (hrs) coefficient o.600 Length (ft) 6o.000 water level (ft) 584.492 at 12.o2 (hrs) invert (ft) 576.000 Slope 0.025 storage (cy) 1145-197 multiple 1 Manning's n 0.013 Area (acres) discharge into riser Inlet coeff. Ke 0.500 70.700 Equation constant set 3 2 Outlet structure 1 Invert (ft) 576.000 time of cane. (hrs) Orifice time increment (hrs) 0.0200 name: Mid -Flow Orifices Outlet structure 3 fudge factor area (sf) o.o87 Weir true diameter or depth (in) 4.000 name: Emergency Spillway peaktime (hrs) width for rect. (in) 01000 length (ft) 5.000 4966.242 coefficient o,600 side angle 8.46o (- invert (ft) 581.250 coefficient 3.300 i I I ,RISER AT ELEV. 582.5 multiple 1 invert (ft) 584.000 LL AND -SEE- discharge into riser multiple 1 \ - _ ___ discharge through dam \ W/HANS+Ofd II ANSI-VORTEXT - _____T_- Outlet structure 4 CONCRETE SH RACK , __� Curve G SH�ET I.11 }- name: Anti -Vortex Device IL t i multiple 1 Invert (ft) 582.5oo DAMWIIDTH=110' discharge into riser , file: twentyfour.txt Inflow Hydrographs name: z -Year 24 -Hour SCS Method Storm Area (acres) 6.710 CN 70.700 Type 2 rainfall, P (in) 3.700 time of cont. (hrs) 0,2200 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 8.452 peak time (hrs) 11.982 volume (cy) 10S9.044 Hydrograph 1 SCS ETIN #7 i 1 name: 10 -Year 24 -Hour SCS Method Storm Area (acres) 6.710 CN 70.700 Type 2 rainfall, P (in) 5.600 time of cont. (hrs) 0,2100 time increment (hrs) o.o2oo time limit (hrs) 30,000 fudge factor :.00 routed true peak flow (cfs) 18,366 peak time (hrs) 11.982 volume (cy) 2301.251 Hydrograph 2 SCS I__+44 ' name::o0-Year 24 -Hour SCS Method Storm Area (acres) 6110 CN 70.700 Type 2 rainfall, P (in) 9.100 time of cane. (hrs) 0.2100 time increment (hrs) 0.0200 time limit (hrs) 30,000 fudge factor 1.00 routed true peak flow (cfs) 39635 peaktime (hrs) 11.982 volume (cy) 4966.242 Routina Method: storage -indication Hydrograph o 2 -Year 24 -Hour SCS Method Storm inflow (cfs) x6,359 at 11.96 (hrs) discharge cf 2. t 12.hr d r age ( s) 467 a 32 (hrs) water level (ft) 546.o8o at 12.34 (hrs) storage (cy) 2039.359 Hydrograph 1 10 -Year 24 -Hour SCS Method Storm inflow (cfs) 34.992 at 11.96 (hrs) discharge (cfs) 2o.292 at 12.:o (hrs) water level (ft) 548.277 at 12.10 (hrs) storage (cy) 1819.333 Hydrograph 2 loo -Year 24 -Hour SCS Method Storm inflow (cfs) 74,613 at 11.96 (hrs) discharge (cfs) 72.o85 at 22.00 (hrs) water level (ft) 548.924 at 12.00 (hrs) storage (cy) 2082,324 Short V11 -ersion BMP Comiputat ens For Worksheets 2 -6 Albemarle County Water Protection Ordnance: Modified Simple Method l" r r P an 'Water Resou ces Area 1�Iestlake Nrlls Ph , Il 111 SWM Facllrt�!, .,, .....,... _„ -....: Development Area Pre ares; Date, KKW PE 04 Mar 14 p1. , 11 11 .111.11 I . _. . 11 I Project Lumina e Area Designation PRE -00 3 PoSTrD# I ryroue Cv Ca utationvglues tiiet � s u 40 0) Item 1 o-..µ. ,w : _ -,w, ., :._.. ,H ,. __Y ; ..._ . , w.r,m___ _ _, :.w_:, I _ w _A n. - ,,, __ _ , y ___ _.,__ __ ..,_ __, _ w: 11.:. 1. I 11 re-tilr�v to trHent 'k # dov�el me i ... - -. 1 _. ___, , __ , ,_ . _,__ __, ,,_ _„ ._, ._ . „ _ _ __ . . __ _ ,..P _.__ , . ___ _ , .. _ . ,_____ __ _.. - .... _ .. _ ---, _... _ . _ __ _ __..__ w . _ I P . ._ m , Raadrnray` (includes C&G) subtotal Roadway (incl1. id s C&G) subteial i __,.._.__... _.. __ ._ m . ,..._. _..._, _...._. _ _ .,.,.. .____ .u__. ..ti__ r...._,_ ..._.__._ I Sidewalks 11(pro). Area Im 5 - , __ _ ___ - - , � � Tec niaai Bullrtirt7 Minimum Standard 3.02 . I 1/8" gin P36t�[i nook aiiaCd ai{h Ufa' faibster g ff »' 0-1/6.- dia. ,bcisft t ;� . � \-,- Is<>azn'a rim lA.1ty pian L I Y-.» bdltod in' 87t -i � strwWralp)"llie vita 0 `Z -d/8" Msoles eud 1/4" PWe ft y ananuracX=Od by P)b20"6 r 0 50-'artime Ina, or equal.. -I _. - +• •. 3F'- i sheen with opt -a.' Plat- 'I t 3'iFt?T aid, coni. tpron W k, k) ."OturO Plaatte With ,,• ,Z-2 8" halm gad 1/4' take ae<,tion rnanutaAwed by Plmd}c 6ohition. hit. ar 'P4W°l 6f6" iiu3. hpi,b I stal 22-1 L_ _ » ._ _- _ i j Q°ri`lm�H°o' Zlevatior3 PF '1C gra wa.e &.a ,86 Q�I f�1: , P,Q. Hct 43 BMP L EBRI CAGE INS. Ift'h = ' W"..0-411;-aainlfmt.eatn SCALE: V:1 "=5' H:1 "=50' 10+00 10+50 11+00 11+50 12+00 12+50 12+75 EXTENDED DETENTION BASIN 4 � FIGURE 3,01- ltr Hczlttogetteons :l rrr&inkrttenA W reef age controls orriocfeneow fill MIN �EQ'D. QV .��� 4 'rt n ?, ,./ / , . -1' . °s ` Apt Oft trench --4' b> OW 6=Die l . TRASH CKS TP BE INSTALLPD TYPICAL. HOMOGENEOUS ON ALL EMBANKMENT Trorisation fiil 805 QV P ' (2 OVID2 ) = 13, = 13 6 14 cf 9 cf I I ORIFICE','; O IFICE PER V OEFFI MH T4CHNICAL TENT = 0.6 I BUL ETIN #7 i 1 42 0, P , � € M' 3.16 $OS �8 04- 1 4. 9 � 919, �� I I 11 .. 11 1. 9 - i yI (, ITionsition filter Transition filter r 721 fa� r14 T8 5,49 CHIMNEY DRAIN TOE DRAIN I , � I i ' i i a I - ._... __..,..... __ ________]________j -1�_ c3L 0w' -.�I_..__ __ -___._____ yy __L____ } ` _ ___.-_ �__ I 4 i 600 CL I__+44 ' F�_,___I _ i ti i I i I i ' i I i I , j I 600 F_ IftetaW%*0'*V,r'6...,Xol;\*A,%t opa a, . 1.60tr 'i ? \�_________ 1*4-?1�R�t+^s4tc„' ------- 11_-____]___1_______,_ arP4 H �(4 --____T__.____1 595 STOR SEWS � � # \ o 6 z i I I J (- 24" I I RCP Ili i I I ,RISER AT ELEV. 582.5 595 ?' OUTF RIPRA LL AND -SEE- -- - ___ I ! _____._ \ - _ ___ __. \ W/HANS+Ofd II ANSI-VORTEXT - _____T_- CONCRETE SH RACK , __� GRADI G SH�ET I.11 }- ® H IL t i i TOP (OF DAMWIIDTH=110' 590 , I i i 0 m AT El�E' .586.00' 590 :2 0 C? ,,, \ Q) �_- °v I U I ' EAFRT,,HEN WITHI 2:11 EMERGENCY SIDE LOPES SPILLWAY AT EL V. _____j1_______1___--I i I__ i 0 - -`_� ______ 84.040' DURRN 'ROVIC}ES , 1._ __ FRE BOAR F- H 1` j = 584.49 \ \ ° THE 100 - -YR Sl F ' i ORM I W�'�/�' 585 -i __ __ _...10 \ -YR SE ' _ � I _____I___ ! �- 585 J� 10' MA 4 I j = 583. 2-Y 5 WSE \ 1 P _. i i r ) I F 0 DEPT z C J ° O _- I 137 __._L v i -I- ` i _._.�-.--__ I __ -_.-----4..-______, 9.4 MAX i 580 I ! W t`? - 1 4° rntnF O IFICE "w 1.1�. ( EMOANKMENT I HEI v� HT i 580 < 716 N l ELEV.581.�5 I �\ 0 I 1 i � - c U ° X N - __1 --------- T Ur DETEN6ED I --------- ,_j______,_f_____j ' o �1 U IU) Q Q) w t-- E n� 575 ° 1 0 Q i 112072 \ - VdflT Ed ST Y. -1 CL. Al 1 575 W 6 (n 7 0 ,n SCALE j F E REBAY' EV. 57 I .00 BOTTOM i OF B' ELE y� SIN � R#SER FOOTING ( SHEET NO. 1 RIPRAP G U OFABF711C DERLA / MENT 570 ------- ______ FORE VDOT CL. Al _____-__.____._. Y SPILLWAY TD. Ed RjIPRAPj -1 3 DRAWDOWN __576_0 i -30HR _ __..___r_______I-._ WN j j ____ I 2 __.,_,____________ n RCP SEL; l = L- �II W�-19 �- _______-_ ; W 3, 1 - ' , D�1.4 i '• 6, ' 570 1 ,2.1 SID ELEV. SLOPS 80.00 E RIFICE, EV. 57 AO f i I L1-60, 1 S 2.51% 56$ I I I V IN. 5 6.00 ' 1 W=6'; =0.5'; L=6' i I h It I ni ITj 574.4 9 568 "N ';M >~M �- i U') (O to LO LO SCALE: V:1 "=5' H:1 "=50' 10+00 10+50 11+00 11+50 12+00 12+50 12+75 EXTENDED DETENTION BASIN 4 � FIGURE 3,01- ltr Hczlttogetteons :l rrr&inkrttenA W reef age controls orriocfeneow fill f -- .��� 4 'rt n ?, ,./ / , . -1' . °s ` Apt Oft trench --4' b> OW 6=Die l . I II— - Sol or rock L ----------- »1 TYPICAL. 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Project .Drainage Area Designation PRIE -DA # 4 POST DA# 4A &:4B Irripery ous Cover Cory ufation (values in feet & §ware feet `Item _ r deVetmeit Are Dstdev1 __., _.... ;Roadway (includes C&G) _....... subtotal [: .roadway !(includes, C&G) subtotal rivewa11 I jr ' I--,-,-- ' iieWallis s_,_ __. i - v_-.,,. _. _ rV-tor rau a n _ ._. , . _ .. L� QLD __` VV lain rice. St:rLiiCli�1 Driire ; Area: X0.70.= X 0.08 x09R= 37 .0 ((SN �� O7� �� T�R. COLLINS'- o. 35'7 91 .�OIVAL ��o�v)� Z 0 L: x U V) LU n z 0 H V) > LU V/ Uj z V M H W ce ,4- W '� .tea "i �, Atet' N "D r, bo fN ri 0) W T_ W M O H M o o w z _ � J N U a � U a Q W O j W z o W o W to > 4 Nt :� 0 12 I CL ce c3L 0w' DL ,4- W '� .tea "i �, Atet' N "D r, bo fN ri 0) T_ M M N Z 4 Nt :� 0 12 I CL ,n ° 0 �_ DL J o W a) N CL C ° N � ° F_ Q) W > � H 0, Affir W � �_ o 6 z J a� U-1 0 `'i AL _J H z a Z H 0.w P ­1c o I.11 }- ® H IL t o �. � o O W ­L9 5 o 0 m z Q :2 0 C? Q) �_- °v U I CL � Uj -0 `� 0� 0 3 se JQ " X W � W F- H 30 s Ul ° (O W�'�/�' Ib.i.. 0 3� \ caE z E- ! cr w a w `� W/ � z ry �_0 O z ._ � �-- . ^ w 0 U rr)- UJ z C J ° O Uu 0 W o Q a W C: mi 1.1�. L- 0 0 0-60 < 716 V �-0 0 O C) � - c U ° X N N (1) U Q) � Ur s� _� to ,: o° o U IU) Q Q) w t-- E n� _ ° ]OB NO, 0 Q 112072 o W 6 (n 7 0 ,n SCALE AS SHOWN -0 2 D ,C U) C a v 0 o SHEET NO. Q) C3 � � (D z FY LLJ GENERAL , � � ,�, , EROSION CONTROL NOTES DESCRIPTION OF EROSION & SEDIMENT EROSION CONTROL NOTES & NARRATIVE T. Pr- �71 Y D ES -1 UNLESS OTHERWISE INDICA TED ALL VEGETATIVE AND STRUCTURAL EROSION L DETAIL GH FOR THE EN RU 0 WITHIN 30 DAYS OF FINAL S17E STABILIZATION, WHIEN MEASURES ARE NO LONGER NEEDED, FOR SITE MAlN7FNANCE. LONG ENOUGH FOR THE MAJORITY OF THE SEDIMENT TO SETTLE OUT. APPLIES BELOW DISTURBED AREAS WHERE THE TOTAL CON7RIBU77NG DRAINAGE AREA /S EQUAL TO OR SUBJECT TO APPROVAL BY 7HE COUNTY EROSION CONTROL INSPECTOR. GREATER 7HAN THREE ACRES 7HERE MUST BE SUFFICIENT SPACE AND APPROPRIATE 21. THIS PLAN SHALL BE VOID IF THE OWNER DOES MOT OBTAIN A PERMIT WITHIN 1 YEAR OF TOPOGRAPHY FOR THE CON57RUC77ON OF A TEMPORARY IMPOUNDMENT. THE DA TE OF APPROVAL. (WATER PROTECTION ORDINANCE SEC77ON 17-204G.) 22. PERMANENT VEGETATION SHALL BE INSTALLED ON ALL DENUDED AREAS WITHIN NINE (9) 3.18 OU7LET PROTECTION: MONTHS AFTER THE DATE THE LAND DISTURBING AC77WTY COMMENCED. (WATER STRUCTURALLY LINED APRONS OR 07HER ACCEPTABLE ENERGY DISSIPATING DEVICES PLACED PR07ECT70N ORDINANCE SEC77ON 17-2078) AT THE OUTLETS OF PIPES OR PAVED CHANNEL SEC77ONS TO PREVENT SCOUR AT STORMWATER OUTLETS, TO PROTECT THE OUTLET S7RUCTURF AND TO MINIMIZE THE P07EN77AL ,SOIL DESCRIPTION FOR DOWN57REAM EROSION BY REDUCING THE VELOCITY AND ENERGY OF CONCEN77?A7ED STORMWATER FLOWS, APPLICABLE TO THE OUIZETS OF ALL PIPES AND ENGINEERED CHANNEL 81B - THURMONT LOAM, 27 TO 77 SLOPES. SOIL 1 WELL DRAINED, WITH MORE SEC77ONS THAN 80 /N. DEPTH TO THE W47ER TABLE. MADE FROM COLLUVIUM 3.19 RIPRAP: DERIVED FROM GRANITE, GRANODIORI TE, AND GRANDE GNEISS, THIS SOIL A PERMANENT, EROSION -RESISTANT GROUND COVER OF LARGE, LOOSE, ANGULAR STONE WITH HAS CONVEX DOWN AND ACROSS -SLOPE SHAPE. THIS SOIL HAS NO FILTER FABRIC OR GRANULAR UNDERLINING. TO PR07ECT 7HE SOIL FROM THE EROSIVE FREQUENCY OF POND/NG OR FLOODING AND ,A MODERATELY HIGH TO HIGH FORCES OF CONCENIRA7ED RUNOFF, SLOW THE VELOCITY OF CONCENTRATED RUNOFF WHILE KSAT WITH MODERATE WATER CAPACITY. ENHANCING THE P071EN77AL FOR /NFIL77?A770N, AND TO STABILIZE SLOPES WITH SEEPAGE 7B - BRADDOCK CLAY LOAM -27 TO 7% SLOPES. SOIL IS WELL DRAINED, W17H PROBLEMS, AND/OR NDN -COHESIVE SOILS. USE WHEREVER SOIL AND WATER INTERFACE AND MORE THAN 80 INCHES TO THE WATER TABLE. MADE FROM ALLUVIUM 77 -IE SOIL CONDITIONS, WATER TURBULENCE AND VELOCITY, EXPECTED VEGETA77VE COVER, ETC., AND COLLUVIUM DERIVED FROM ACID CRYSTALLINE ROCKS, THIS SOIL HAS ARE SUCH 7HAT 7HE SOIL MAY ERODE UNDER 7HE DESIGN FLOW COND177ONS CONVEX DOWN-SLOPE AND LINEAR ACROSS -SLOPE SHAPE. NO FREQUENCY OF PONDING OR FLOODING, HIGHt WATER CAPACITY, AND 3.31 TEMPORARY SEEDING MODERATELY HIGH TO HIGH KSAT. THE ESTABLISHMENT OF A TEMPORARY VEGETA77VE COVER ON DISTURBED AREAS BY SEEDING K17H APPROPRIATE RAPIDLY GROWING ANNUAL PLANTS. TO REDUCE EROSION AND 37C3 - HAYESVILLE CLAY LOAM -77 TO 159. SLOPES'. SOIL IS WELL DRAINED, SEDIMENTATION BY STABILIZING DISTURBED AREAS THAT WILL NOT BE BROUGHT TO FINAL WITH MORE THAN 80 INCHES TO THE WA7FR TABLE MADE FROM GRADE FOR A PERIOD OF MORE THAN 30 DAYS. TO REDUCE DAMAGE FROM SEDIMENT AND AND SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND S+ CONTROL MEASURES: ROADS ROADS 1. THE OWNER/CLIENT OF THIS PROPERTY IS. MAINTAINED ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF - Water Application LICKINGHOLE CREEK, LLC THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA Dilution. Type of Rate Al�i� (IAftlak : RAtcr) � Ist2 /Ag& -1 EXISTING CULVERT 2421 IVY ROAD REGULATIONS VR 625--02-00 EROSION AND SEDIMENT CONTROL EROSION AND SEDIMENT CONTROL MEASURES: CULVERT CHARLOTTESVILLE, VA 22902 REGULATIONS IT IS ANTICIPATED THAT A CONSTRUCTION ENTRANCE, TEMPORARY DIVERSION Resin in Water 4.2 Fine Spray 3Otl 2. THE DEVELOPER OF THIS PROPERTY IS. ES -2: THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR TO DIKES, RIGHT OF WAY DIVERSION, SEDIMENT TRAPS AND BASINS, OUTLET RED TOP GRASS 2 LBS. SEED. TO REDUCE E=ROSION AND DECREASE SEDIMENT YIELD FROM DISTURBED AREAS. TO DROP INLET &STRUCTURE N0. A RIVERBEND DEVELOPMENT, INC. 321 E MAIN ST, SUITE 201 THE PRE -CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE PROTECTION, INLET PROTECTION, AND SILT FENCE WILL BE INSTALLED TO f ;MI: . Sourcas Va. DSWC, 0 LU CHARLOTTESVILLE, VA 22902 COMMENCEMENT OF LAND DISTURBING AC77VITY, AND ONE WEEK PRIOR TO CONTROL SURFACE DRAINAGE. TEMPORARY SEEDING WILL BE USED IMMEDIATELY CURB IMPROVE WILDLIFE HABITAT TO ENHANCE NATURAL BEAUTY. UPON COMPLE77ON OF THE FINAL INSPECTION. MODERATELY HIGH TO HIGH KSAT. Ew rr •' AT7N: ALAN TAYLOR ES-3:ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR FOLLOWING ALL LAND DISTURBANCE ACTIVITIES TEMPORARY STOCKPILE AREAS CURB & GUTTER 3. THESE PLANS HAVE BEEN PREPARED BY.• TO OR AS THE FIRST STEP /N CLEARING. WILL BE MAINTAINED FROM TOPSOIL THAT WILL BE STRIPPED FROM AREAS TO BE PROPOSED PAVEMENT COLLINS ENGINEERING, INC ES -4:A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL GRADED AND STORED FOR LATER SPREADING. STOCKPILE LOCATIONS SHALL BE AUGUST 16 THROUGH OCTOBER ANNUAL RYE 200 GARRETT STREET, SU17F K CHARLOTIES WlLLE, VA 22902 BE MAINTAINED ON THE SITE AT ALL 77MES ON Sl7F AND SHALL BE STABILIZED WITH A TEMPORARY VEGETATIVE COVER. EC -3A DITCH TELEPHONE: (434) 293-3719 FACSIMILE: (434) 293-2813 ES-S:PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS OTHER THAN INDICATED ON THESE PLANS (INCLUDING BUT NOT LIMITED TO, OFF-SITE PERMANENT SEEDING WILL BE PERFORMED FOR ALL AREAS WHICH WILL NO DEPTH OF EC -3A DITCH 4. SOURCE OF TOPO & SURVEY TOPOGRAPHY COMPILED FROM SURVEY BY A BORROW OR WASTE AREAS), THE CONTRACTOR SHALL SUBMIT A ) LONGER BE EXCAVATED AND WHERE CONSTRUC77ON ACT7V7TIES HAVE CEASED. 6„ COMBINATION OF ROUDABUSH, GALE AND ASSOCIA7FS AND LOUISA AERIAL SURVEYS SUPPLEMENTARY EROSION CONTROL PLAN TO THE OWNER FOR REVIEW AND PERMANENT SEEDING SHALL ALSO BE PERFORMED FOR ALL DENUDED AREAS TESTS AND APPLIED IN ACCORDANCE WITH VESCH STD. 3.32. INC., JANUARY 20D7. BOUNDARY INFORMATION IS COMPILED FROM BOUNDARY DATA B E PLAN APPROVING AUTHORITY. APPROVAL Y TH LA BE FT DORMANT R WHICH WILL LE D OMAN FOR A YEAR DR MORE. SELECTION OF SEED EC -2 DITCH PROVIDED BY ROUDABUSN, GALE, AND ASSOCIATES, DATED APRIL 2013. D B ES -6: THE CONTRACTOR /S RESPONSIBLE FOR INSTALLA77ON OF ANY ADDITIONAL MIXTURE WILL DEPEND ON 7HE 77ME OF YEAR APPLIED. TEMPORARY SEEDING OF SEED APPLICATION, IN ACCORDANCE W/ VESCH STD 3.35, 5 ZONING: RESIDENTIAL, CLUSTER DEVELOPMENT AND BONUS DENSITY STANDARDS EROSION CONTROL MEASURES NECESSARY TO PREVENT EROSION AND FROM RESIDUUM WEATHERED FROM GRANITE ,AND GNEISS, THIS SOIL HAS 6" DEPTH OF EC -2 DITCH ARE BEING IMPLEMENTED. SEDIMENTATION AS DETERMINED BY THE PLAN APPROVING AUTHORITY. WILL BE PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT PERMANENT SEEDING SCHEDULE 6. TAX MAP AND PARCEL NUMBER: 05600-00-00-095A0, 05600-00-00-09580, ES -'.ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL FOR MORE THAN SEVEN DAYS. THESE AREAS SHALL BE SEEDED WITH FAST -,,, EARTH DITCH 05600-00-00-05300 MEASURES AT ALL 77MES DURING LAND DISTURBING A077VI77ES AND DURING GERMINA77NG VEGETA77ON IMMEDIATELY FOLLOWING GRADING OF THOSE AREAS NO SCALE Z USGS DATUM: NAD 83 SITE DEVELOPMENT UNTIL FINAL 5 TA BIL IZA 77 ON IS ACHIEVED. SELECTION OF SEED MIXTURE WILL DEPEND ON THE TIME OF YEAR APPLIED. DRIVEWAY CULVERT 8. LOCATION/ADDRESS OF PROJECT EAST OF WESTHALL DEVELOPMENT ES -8: DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN HAYESVILLE LOAM -29 TO 77 SLOPES. SOIL IS WELL DRAINED, WITH {STI}, & SPEC. 3.32 OF VIRGINIA EROSION & 9. TOTAL ACREAGE OF SITE: 24.53 ACRES APPROVED WATER FILTERING DEVICE. MORE THAN 80 INCHES TO THE WATER TABLIEE, MADE FROM RESIDUUM + BENCH MARK 10. SITE PHASING. MINIMUM FOUR PHASES ES -9: THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES 3.01 SAFETY FENCE -SAFETY FENCE WILL BE INSTALLED AROUND ALL 11. PUBLIC UTILITIES. CONNECT TO EXIS77NG PUBLIC SEWER AND WATER PERIODICALLY AND AFTER EACH RUNOFF -PRODUCING RAINFALL EVENT. PROPOSED SEDIMENT BASINS AND SEDIMENT TRAPS. - CLEARING LIMITS IANY NECESSARY REPAIRS OR CLEANUP TO MAINTAIN THE EFFEC77VENESS 3.02 CONS7RUCTION ENTRANCE - ONE CONSTRUCTION EN7RANCE SHALL BE - - - * COLLINS ENGINEERING SHALL NOT HAVE AUTHORITY OVER CON7RACTOR'S WORK, OF THE EROSION CONTROL DEVICES SHALL BE MADE IMMEDIATELY. INSTALLED AT WESTHALL DRIVE. THIS WILL BE THE ONLY POINT OF INGRESS as VDOT STANDARD STOP SIGN SAFETY PRECAUTIONS, SCHEDULES, OR COMPLIANCE WITH LAWS AND REGULATIONS. WE SHALL NOT ASSUME RESPONSIBILITY FOR ANY CONSTRUC77ON STARTED PRIOR TO CONTROL NOTES' AND EGRESS TO THE SITE. CARE WILL BE TAKEN TO PROTECT ADJACENT -- - - -200- ---- - - EXISTING CONTOUR PLAN APPROVAL. .EROSION ROADWAYS FROM TRANSFER OF SEDIMENT. 1. THE PLAN APPROVING AUTHORITY MUST BE N077FIED ONE WEEK PRIOR TO THE 305 SILT FENCE- SILT FENCE WILL BE PLACED ON THE DOWNSTREAM SIDE OF 20O_ PROPOSED CONTOUR PRE-CONS7RUC77ON CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT OF LAND DISTURBANCE WHERE N07ED ON THE PLANS. DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO 7HE FINAL INSPECTION. 2. ALL EROSION AND SEDIMENT CON7ROL MEASURES WILL BE CONSTRUCTED AND MAINTAINED 307 STORM DRAIN INLET PROTECTION- IP WILL BE INSTALLED ON EACH 240.55 PROPOSED SPOT ELEVATION - ACCORDING TO MINIMUM STANDARDS AND SPECIFICA77ONS OF THE VIRGINIA EROSION AND PROPOSED INLET AS SHOWN ON THE PLANS. TBC DENOTES TDP BA .�BACK OF CURB T/B DENOTES TOP BOX EROSION S'E'DIMENT CO �%TR®� AND WRGIN/A RECULA77ONS VR 625-02-00 EROSION AND SEDIMENT CONTROL HANDREGUBOOK 3.09 TEMPORARY DIVERSION DIKE- DIVERSION DIKES WILL BE USED AROUND THE sic J. ALL EROSION AND SEDIMENT CON7ROL MEASURES ARE TO BE PLACED PRIOR TO OR AS PERIMETER OF SITE DISTURBANCE WHERE SHOWN ON THE PLANS TO DIRECT * VIRGINIA EROSION & SEDIMENT CON7ROL 7HE FIRST STEP IN CLEARING. RUNOFF TO ON-SITE SEDIMENT CON7ROL FACILITIES EROSION CONTROL HANDBOOK SPECIFICA77ON NUMBER .MEASURES. 4. A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE 313 TEMPORARY SEDIMENT TRAP- TEMPORARY SEDIMENT TRAPS WILL BE * STRUCTURAL EROSION AND SEDIMENT CONTROL PRAC77CES SHALL BE IN ACCORDANCE MAINTAINED ON THE S17E AT ALL 77MES. INSTALLED WHERE SHOWN ON THE PLANS aIZGZC� STRAW BAIL BARRIER 3.04 WITH THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK. STRUCTURAL PRACTICES USED IN THIS SEC77ON CONSIST OF THE FOLLOWING.• 5. PRIOR TO COMMENCING LAND DISTURBING AC77V777ES IN AREAS OTHER THAN 1NDICA7ED ON THESE PLANS (INCLUDING, BUT NOT LMI7EED 7T0, OFF-SITE BORROW OR WASTE 314 TEMPORARY SEDIMENT BASIN- TEMPORARY SEDIMENT BASINS WILL BE AREAS), THE CONTRACTOR SHALL SUBMIT A SUPPLEMENTARY EROSION CONTROL PLAN TO INSTALLED WHERE SHOWN ON THE PLANS. DD ���► TEMPORARY DIVERSION DIKE 3.09 3.01 SAFETY FENCE., A PR07EC77VE BARRIER INSTALLED TO PREVENT ACCESS TO AN EROSION CONTROL MEASURE. 7HE OWNER FOR REVIEW AND APPROVAL BY THE PLAN APPROVING AUTHORITY 6. THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADD177ONAL EROSION 318 OUTLET PROTECTION- TO BE PROVIDED AT THE OUTFALL OF DRAINAGE TO PROHIBIT THE UNDESIRABLE USE OF AN EROSION CONTROL MEASURE BY THE PUBLIC. CONTROL MEASURES NECESSARY TO PREVENT ERsOSION AND SEDIMENTA77ON AS PIPES WHERE SHOWN ON PLANS ST MPW O TEMPORARY SEDIMENT TRAP 313 APPLICABLE TO ANY CONTROL MEASURE OR SERIES OF MEASURES WHICH CAN BE CONSIDERED DETERMINED BY THE PLAN APPROVING AUTHORITY. 3.19 RIPRAP- RIPRAP SHALL BE INSTALLED AS OUTLET PROTECTION WHERE UNSAFE BY VIRTUE OF POTEN77AL ACCESS BY THE PUBLIC. 7. ALL DIS7iURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL MEASURES AT SHOWN ON THE PLANS (: SB SEDIMENT BASIN 3.74 3.02 CONS7RUCTION ENTRANCE: ALL 77MES DURING LAND DISTURBING AC77Vl77ES AND DURING S17E DEVELOPMENT UN77L FINAL STABILIZA77ON /S ACHIEVED. 3.3t TEMPORARY SEEDING- TEMPORARY SEEDING SHALL BE APPLIED WHERE A STABILIZED PAVED CONS 7RUC77ON EN7RANCE WITH A WASH RACK LOCATED AT POINTS OF 8. DURING DEW417FRING OPERATIONS, W47E'R WILL BE PUMPED INTO AN APPROVED FILTERING SHOWN ON THE PLANS. 0INLET PROTECTION 3.07 VEHICULAR INGRESS AND EGRESS ON A CONSTRUCTION SITE. TO REDUCE THE AMOUNT OF DEVICE. 3.32 PERMANENT SEEDING- PERMANENTLY SEEDING SHALL BE APPLIED WHERE MUD 7RANSPOR70 ONTO PAVED PUBLIC ROADS BY MOTOR VEHICLES OR RUNOFF. 9. THE CON7RACTOR SHALL INSPECT ALL EROSION C'0N7ROL MEASURES PERIODICALLY AND SHOWN ON THE PLANS. CONSTRUCTION EN7RANCES SHALL BE INSTALLED AS SHOWN ON THE PLANS TO REDUCE THE AF 7ER EACH RUNOFF PRODUCING RAINFALL EVENT ANY NECESSARY REPAIRS OR SF X --X _* SILT FENCE 3.05 AMOUNT SEDIMENT 7RANSPORTED ONTO PUBLIC ROADWAYS. CLEANUP TO MAINTAIN THE EFFEC77VENESS OF INE EROSION CONTROL DEVICES SHALL BE 338 TREE PRESERVATION AND PRO 7FCT10N- 7REE PRESERVATION FENCING MADE IMMEDIATELY. SHALL BE INSTALLED WHERE SHOWN ON THE PLANS. NO TREES SHALL BE CE C0NS7RUC77ON ENTRANCE 3.02 3.05 S/LT FENCE. -HARMED A TEMPORARY SEDIMENT BARRIER CONSIS77NG OF A SYN7HETIC FILTER FABRIC S7RETCHED 10. ALL FILL MATERIAL TO BE TAKEN FROM AN APPROVED DESIGNATED BORROW AREA. 11, ALL WASTE MA7E'RIALS SHALL BE TAKEN TO AN APPROVED WASTE AREA. EAR7H FILL OUTSIDE OF THE LIMITS OF TREE PR07FC770N FENCING. ACROSS AND ATTACHED TO SUPPOR77NG POSTS AND EN7RENCHED, TO INTERCEPT AND DETAIN SHALL BE INERT MATERIALS ONLY, FREE OF ROOTS, STUMPS, WOOD, RUBBISH, AND OTHER 3.39 DUST CONTROL- DUST CONTROL SHALL BE APPLIED THROUGHOUT THE S17E SMALL AMOUNTS OF SEDIMENT FROM DISTURBED AREAS DURING CONS7RUC77ON OPERA77ONS /N DEBRIS. WHERE SHOWN ON THE PLANS S ' CHECK DAM 3.20 ORDER TO PREVENT SEDIMENT FROM LEAVING THE SITE, AND TO DECREASE THE VELOCITY OF 12. BORROW OR WASTE AREAS ARE TO BE RECLAIMED WITHIN 7 DAYS OF COMPLETION PER ZONING ORDINANCE SEC77ON 5.1.28. SHEET FLOWS AND FLOW--TO-MODERATE LEVEL CHANNEL FLOWS THE SILT FENCE BARRIERS SHALL BE INSTALLED DOWN SLOPE OF AREAS WITH MINIMAL GRADES TO FIL7ER SEDIMENT 13. ALL INERT MATERIALS SHALL BE 7RANSPORTED IN COMPLIANCE WITH SEC77ON 13-301 OF STORMWATER MANAGEMENT.• FD � TEMPORARY FILL DIVERSION 3.10 LADEN RUNOFF FROM SHEET FLOW AS INDICATED. THEY SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND MAINTAINED /N ACCORDANCE WITH THE VIRGINIA EROSION & THE CODE OF ALBEMARLE. 14. BORROW, FILL OR WASTE AC77WTY INVOLVING INDUSTRIAL -TYPE POWER EQUIPMENT SHALL STORMWATER RUNOFF QUANTITY WILL BE 7REATED ON-SITE THROUGH THREE BE LIMI7ED TO THE HOURS OF 7.• OOAM TO 9.00PAA. EXTENDED DETEN77ON PONDS AND ONE DETEN770N POND. THE ENTIRE PROJECT S0, 0 DIVERSION 3.12 SEDIMENT CONTROL HANDBOOK (VESCH). 15. BORROW, FILL OR WASTE AC77WTY SHALL BE CONDUCTED IN A SAFE MANNER THAN MAINTAINS LATERAL SUPPORT, OR ORDER TO MINIMIZE ANY HAZARD TO PERSONS, IS INCLUDED IN A PRO -RATA SHARE FOR STORMWATER QUALITY WITH THE LICKINGHOLE REGIONAL STORMWATER MANAGEMENT FACILITY. SEE STORMWATER 3 STORM DRAIN INLET PROTECTION:- A SEDIMENT FILTER OR AN EXCA VA TED IMPOUND/NG AREA AROUND A STORM DRAIN DROP S PHYSICAL DAMAGE TO ADJACENT LAND AND IMPROVEMENTS, AND DAMAGE TO ANY PUBLIC S77?EET BECAUSE D SLIDES, SINKING, OR sCOLLAPSE MANAGEMENT PLAN SHEETS. PS PERMANENT SEEDING 3.32 a INLET OR CURB INLET. TO PREVENT SEDIMENT FROM ENTERING STORM RSYSTEMS 16. 7HE DEVELOPER SHALL RESERVE THE RIGHT TO IMSTALL, MAINTAIN, REMOVE OR CONVERT ON OF THE DISTURBED AREA. INLET PR 07EC71 APPLIES PRIOR TO PERMANENT STABILIZA77ON P TO PERMANENT STORMWAT ER MANAGEMENT FACILI'77ES WHERE APPLICABLE ALL EROSION WHERE STORM DRAIN INLETS ARE TO BE MADE OPERATIONAL BEFORE PERMANENT DRAINAGE AREA. CONTROL MEASURES REQUIRED BY THIS PLAN REGARDLESS OF THE SALE OF ANY LOT MA/NTENAI�(CE.• STABILIZA77ON OF THE CORRESPONDING DISTURBED UNIT, BUILDING OR OTHER PORTION OF 7HE PROPIERTY TO TD TOPSOILING 3.30 17. TEMPORARY STABILIZA77ON SHALL BE TEMPORARY SEEDING AND MULCHING. SEEDING IS TO IN GENERAL, DURING CONSTRUC77ON 7HE RLD OR CONTRACTOR ON-SITE WILL CHECK 3.09 TEMPt1 AR RY DI►i RS/ON DIKE A TEMPORARY RIDGE R COMPACIFD SOIL CONSTRUCTED AT THE TOP OR BASE OF A SLOPING BE AT 75 LBS/ACRE, AND IN THE MONTHS OF SEPTEMBER TO FEBRUARY TO CONSIST A ALL EROSION AND SEDIMENT CONTROL MEASURES DAILY AND AFTER EACH 8 CIP CULVERT INLET PROTECTION 3.08 DISTURBED AREA. TO DIVERT STORM RUNOFF FROM UPSLOPE DRAINAGE AREAS AWAY FROM CONST MIX OF ANNUAL RYEGRASS AND CEREAL WM1VINSER RYE, SI /N MARCH AND APRIL TO CONSIST OF ANNUAL RYE, OR MAY THROUGH AUGUST TO CONSIST OF GERMAN MILLET. SIGNIFICANT RAINFALL, MONITORING REPORTS WILL BE REQUIRED FROM THE RLD 1E. UNPRO7EC7ED DISTURBED AREAS AND SLOPES TO A STABILIZED OU7LET. TO DIVERT NEEDED. SPECIFIC ATTENTION WILL BE GIVEN TO THE FOLLOWING ITEMS. - PP FACILITY SUCH SEDIMENT -LADEN RUNOFF FROM A DISTURBED AREA TO A SEDIMENT IRA /NG L STRAW MULCH /S TO BE APPLIED AT 80LBS 100S1F ALTERNATIVES ARE SUBJECT TO a. SEDIMENT I R PS ILL BE LEANED AND MAINTAINED IN SED MEN BASINS ANOfO TRA W C DC DC --}- DUST CONTROL 3.39 AS A SEDIMENT 7RAIP OR SEDIMENT BASIN. USE WHEREVER STORMWA7ER RUNOFF MUST BE D/VERAED TO PR07ECT DISTURBED AREAS AND SLOPES OR RETAIN SEDIMENT ON APPROVED S THE COUNTY HALL B CONTROL INSPECTOR. 18. PERMANENT STABILIZA77ON SHALL LIME AND FERTILIZER, PERMANENT SEEDING, AND ACCORDANCE WITH THE VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK. 7FMPORARILY S/TE DURING CONSTRUC770N. THESE STRUCTURES GENERALLY HAVE A LIFE EXPECTANCY OF 18 S MULCH. AGRICULTURAL GRADE LIMESTONE SHALL BE APPLIED AT 90LBS/1000SF, AGRICULTURAL b. ALL INLET PROTECTION AND GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP THAT WILL PREVENT PROPER DRAINAGE, IF THE GRAVEL I'S TSD - TEMPORARY SLOPE DRAIN 3.15 MONTHS OR LESS, WHICH CAN BE PROLONGED WITH PROPER MAIN7E`NANCE, INCORPORATED INTO THE TOP 4-6 INCHES OF SOI/L. FER77LIZER SHALL BE APPLIED AT 1000LBS/ACRE AND CONSIST OFA 10-20-10 NU�7RIENT MIX. PERMANENT SEEDING SHALL CLOGGED BY SEDIMENT, THE GRAVEL WILL BE REMOVED AND CLEANED, OR IT' WILL 8E REPLACED. 3.13 TEMPORARY SEDIMENT TRAP: BE APPLIED AT 180LBS/ACRE AND CONSIST OF 9;5Z KENTUCKY 31 OR TALL FESCUE AND c. ALL SILT FENCE BARRIERS WILL BE CHECKED REGULARLY FOR UNDERMINING sOR ALL SILTFENCE A TEMPORARY PONDING AREA FORMED BY CONS7RUC77NG AN EARTHEN EMBANKMENT WITH A 0-57. PERENNIAL RYEGRASS OR KENTUCKY BLUEGRASS STRAW MULCH IS TO BE APPLIED OF THE FABRIC AND REPAIRED AS REQUIRED. SEDIMENT SHALL e SAFETY FENCE 3.01 STONE OUTLET. TO DETAIN SEDIMENT -LADEN RUNOFF FROM SMALL DISTURBED AREAS LONG AT 80LBS/IOOSF. AL7ERNA77VES ARE SUBJECT T01 APPROVED BY THE COUNTY EROSION BE REMOVED WHEN THE LEVEL OF SEDIMENT DEPOSITION REACHED HALF WA )Y TO ENOUGH TO ALLOW THE MAJORITY OF THE SEDIMENT TO SET7LE OUT. USE BELOW DISTURBED CONTROL INSPECTOR. THE TOP OF THE BARRIER. AREAS WHERE THE TOTAL CONTRIBUTING DRAINAGE AREA IS LESS THAN 3 ACRES, WHERE THE 19. MAINTENANCE.ALL MEASURES ARE TO BE INSPECTED WEEKLY AND AFTER EACH SEDIMENT TRAP WILL BE USED NO LONGER THAN 18 MON77-IS, AND IT MAYBE CONS7RUC7ED RAINFALL. ANY DAMAGE OR CLOGGING TO S7RUCTIURAL MEASURES IS TO BE REPAIR d ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO SEE THAT A GOOD STAND RW > TEMPORARY RIGHT -OF WAY 3.11 E� EI7HER /NDEPENDEN71Y OR IN CONJUNC77ON Wl7H A TEMPORARY DIVERSION DIKE. IMMEDIATELY SILT TRAPS ARE TO BE CLEANED WHEN 5OX OF THE WET STORAGE VOLUME IS MAINTAINED. AREAS SHOULD BE FERTILIZED AND RESEEDED AS NEEDED. , DIVERSION IS FILLED Wl7H SEDIMENT. ALL SEEDED AREAS ARE TO BE RESEEDED WHEN NECESSARY /N CASE OF EMERGENCY, THE PRIMARY CONTACT FOR THE PROJECT WILL BE THE RLD 314 TEMPORARY SEDIMENT BASIN: TO ACHIEVE A GOOD STAND OF GRASS. SILT FENCE AND DIVERSION DYKES WHICH ARE OR CONTRACTOR ON-SITE: THE CONTRACTOR WILL BE DETERMINED AT THE TIME THE A TEMPORARY BARRIER OR DAM WITH A CON7ROLLED STORMWATER RELEASE STRUCTURE COLLEC77NG SEDIMENT TO HALF THEIR HEIGHT MUST BE CLEANED AND REPAIRED CONTRACT IS AWARDED. IN ADD17ION THE OWNER MAY BE CONTACTED, MR. ALAIN FORMED BY CONSTRUC77NG AN EMBANKMENT OF COMPACTED SOIL ACROSS A DRAINAGEWAY. IMMEDIATELY. TAYLOR. UPON COMPLETION OF THE PROJECT, THE OWNER WILL BE RESPONSIBLE N FF FROM DISTURBED AREAS IN "WET" AND `1nRY" STORAGE 20. ALL TEMPORARY EROSION AND SEDIMENT CONTROL' MEASURES ARE TO BE REMOVED L DETAIL GH FOR THE EN RU 0 WITHIN 30 DAYS OF FINAL S17E STABILIZATION, WHIEN MEASURES ARE NO LONGER NEEDED, FOR SITE MAlN7FNANCE. LONG ENOUGH FOR THE MAJORITY OF THE SEDIMENT TO SETTLE OUT. APPLIES BELOW DISTURBED AREAS WHERE THE TOTAL CON7RIBU77NG DRAINAGE AREA /S EQUAL TO OR SUBJECT TO APPROVAL BY 7HE COUNTY EROSION CONTROL INSPECTOR. GREATER 7HAN THREE ACRES 7HERE MUST BE SUFFICIENT SPACE AND APPROPRIATE 21. THIS PLAN SHALL BE VOID IF THE OWNER DOES MOT OBTAIN A PERMIT WITHIN 1 YEAR OF TOPOGRAPHY FOR THE CON57RUC77ON OF A TEMPORARY IMPOUNDMENT. THE DA TE OF APPROVAL. (WATER PROTECTION ORDINANCE SEC77ON 17-204G.) 22. PERMANENT VEGETATION SHALL BE INSTALLED ON ALL DENUDED AREAS WITHIN NINE (9) 3.18 OU7LET PROTECTION: MONTHS AFTER THE DATE THE LAND DISTURBING AC77WTY COMMENCED. (WATER STRUCTURALLY LINED APRONS OR 07HER ACCEPTABLE ENERGY DISSIPATING DEVICES PLACED PR07ECT70N ORDINANCE SEC77ON 17-2078) AT THE OUTLETS OF PIPES OR PAVED CHANNEL SEC77ONS TO PREVENT SCOUR AT STORMWATER OUTLETS, TO PROTECT THE OUTLET S7RUCTURF AND TO MINIMIZE THE P07EN77AL ,SOIL DESCRIPTION FOR DOWN57REAM EROSION BY REDUCING THE VELOCITY AND ENERGY OF CONCEN77?A7ED STORMWATER FLOWS, APPLICABLE TO THE OUIZETS OF ALL PIPES AND ENGINEERED CHANNEL 81B - THURMONT LOAM, 27 TO 77 SLOPES. SOIL 1 WELL DRAINED, WITH MORE SEC77ONS THAN 80 /N. DEPTH TO THE W47ER TABLE. MADE FROM COLLUVIUM 3.19 RIPRAP: DERIVED FROM GRANITE, GRANODIORI TE, AND GRANDE GNEISS, THIS SOIL A PERMANENT, EROSION -RESISTANT GROUND COVER OF LARGE, LOOSE, ANGULAR STONE WITH HAS CONVEX DOWN AND ACROSS -SLOPE SHAPE. THIS SOIL HAS NO FILTER FABRIC OR GRANULAR UNDERLINING. TO PR07ECT 7HE SOIL FROM THE EROSIVE FREQUENCY OF POND/NG OR FLOODING AND ,A MODERATELY HIGH TO HIGH FORCES OF CONCENIRA7ED RUNOFF, SLOW THE VELOCITY OF CONCENTRATED RUNOFF WHILE KSAT WITH MODERATE WATER CAPACITY. ENHANCING THE P071EN77AL FOR /NFIL77?A770N, AND TO STABILIZE SLOPES WITH SEEPAGE 7B - BRADDOCK CLAY LOAM -27 TO 7% SLOPES. SOIL IS WELL DRAINED, W17H PROBLEMS, AND/OR NDN -COHESIVE SOILS. USE WHEREVER SOIL AND WATER INTERFACE AND MORE THAN 80 INCHES TO THE WATER TABLE. MADE FROM ALLUVIUM 77 -IE SOIL CONDITIONS, WATER TURBULENCE AND VELOCITY, EXPECTED VEGETA77VE COVER, ETC., AND COLLUVIUM DERIVED FROM ACID CRYSTALLINE ROCKS, THIS SOIL HAS ARE SUCH 7HAT 7HE SOIL MAY ERODE UNDER 7HE DESIGN FLOW COND177ONS CONVEX DOWN-SLOPE AND LINEAR ACROSS -SLOPE SHAPE. NO FREQUENCY OF PONDING OR FLOODING, HIGHt WATER CAPACITY, AND 3.31 TEMPORARY SEEDING MODERATELY HIGH TO HIGH KSAT. THE ESTABLISHMENT OF A TEMPORARY VEGETA77VE COVER ON DISTURBED AREAS BY SEEDING K17H APPROPRIATE RAPIDLY GROWING ANNUAL PLANTS. TO REDUCE EROSION AND 37C3 - HAYESVILLE CLAY LOAM -77 TO 159. SLOPES'. SOIL IS WELL DRAINED, SEDIMENTATION BY STABILIZING DISTURBED AREAS THAT WILL NOT BE BROUGHT TO FINAL WITH MORE THAN 80 INCHES TO THE WA7FR TABLE MADE FROM GRADE FOR A PERIOD OF MORE THAN 30 DAYS. TO REDUCE DAMAGE FROM SEDIMENT AND 11 RESIDUUM WEATHERED FROM GRANDE AND GNEISS, THIS SOIL HAS 50150 Mix of ADHESIVES USED FOR DUST` CONTROL d1 CONVEX DOWN-SLOPE AND CONVEX ACROSS --SLOPE SHAPE. NO Water Application EXPOSED DURING CO>N57RU077ON UN77L PERMANENT VEGETATION OR OTHER EROSION CONTROL & Dilution. Type of Rate Al�i� (IAftlak : RAtcr) � Ist2 /Ag& >i TAL LBS MEASURES CAN BE ESTABLISHED. AAr i xti Asphalt Emulsion 7:1 Coarse Spray 1,200 MODERATELY HIGH TO HIGH KSAT: tUEF1LL. SLOPE (3•.t O�t�.SSI PER 1:atex Emulsion 12.5:1 Fine Spray ?35. 37D3 - HAYESVILLE CLAY LOAM -157 TO 257 SLOPES. SOIL IS WELL DRAINED, Resin in Water 4.2 Fine Spray 3Otl THE ESTABLISHMENT OF PERENNIAL VEGETA77VE COVER ON DISTURBED AREAS BY PLAN77NG ABOVE GRADE AND 4' A lic Emulsion {l ion -`Tial) 7:1 Coarse dray 450 RED TOP GRASS 2 LBS. SEED. TO REDUCE E=ROSION AND DECREASE SEDIMENT YIELD FROM DISTURBED AREAS. TO �1.crglic Emulsinn ('I'ralftc} 3,5;1 Coarse Spray 350 RESIDUUM WEATHERED FROM GRANITE AND GNEISS, THIS SOIL HAS SEASONAL NURSE CROP 20 LBS. PERMANENTLY STAB11LIZE DISTURBED AREAS IN A MANNER THAT IS ECONOMICAL, ADAPTABLE TO f ;MI: . Sourcas Va. DSWC, L DETAIL GH FOR THE EN RU 0 WITHIN 30 DAYS OF FINAL S17E STABILIZATION, WHIEN MEASURES ARE NO LONGER NEEDED, FOR SITE MAlN7FNANCE. LONG ENOUGH FOR THE MAJORITY OF THE SEDIMENT TO SETTLE OUT. APPLIES BELOW DISTURBED AREAS WHERE THE TOTAL CON7RIBU77NG DRAINAGE AREA /S EQUAL TO OR SUBJECT TO APPROVAL BY 7HE COUNTY EROSION CONTROL INSPECTOR. GREATER 7HAN THREE ACRES 7HERE MUST BE SUFFICIENT SPACE AND APPROPRIATE 21. THIS PLAN SHALL BE VOID IF THE OWNER DOES MOT OBTAIN A PERMIT WITHIN 1 YEAR OF TOPOGRAPHY FOR THE CON57RUC77ON OF A TEMPORARY IMPOUNDMENT. THE DA TE OF APPROVAL. (WATER PROTECTION ORDINANCE SEC77ON 17-204G.) 22. PERMANENT VEGETATION SHALL BE INSTALLED ON ALL DENUDED AREAS WITHIN NINE (9) 3.18 OU7LET PROTECTION: MONTHS AFTER THE DATE THE LAND DISTURBING AC77WTY COMMENCED. (WATER STRUCTURALLY LINED APRONS OR 07HER ACCEPTABLE ENERGY DISSIPATING DEVICES PLACED PR07ECT70N ORDINANCE SEC77ON 17-2078) AT THE OUTLETS OF PIPES OR PAVED CHANNEL SEC77ONS TO PREVENT SCOUR AT STORMWATER OUTLETS, TO PROTECT THE OUTLET S7RUCTURF AND TO MINIMIZE THE P07EN77AL ,SOIL DESCRIPTION FOR DOWN57REAM EROSION BY REDUCING THE VELOCITY AND ENERGY OF CONCEN77?A7ED STORMWATER FLOWS, APPLICABLE TO THE OUIZETS OF ALL PIPES AND ENGINEERED CHANNEL 81B - THURMONT LOAM, 27 TO 77 SLOPES. SOIL 1 WELL DRAINED, WITH MORE SEC77ONS THAN 80 /N. DEPTH TO THE W47ER TABLE. MADE FROM COLLUVIUM 3.19 RIPRAP: DERIVED FROM GRANITE, GRANODIORI TE, AND GRANDE GNEISS, THIS SOIL A PERMANENT, EROSION -RESISTANT GROUND COVER OF LARGE, LOOSE, ANGULAR STONE WITH HAS CONVEX DOWN AND ACROSS -SLOPE SHAPE. THIS SOIL HAS NO FILTER FABRIC OR GRANULAR UNDERLINING. TO PR07ECT 7HE SOIL FROM THE EROSIVE FREQUENCY OF POND/NG OR FLOODING AND ,A MODERATELY HIGH TO HIGH FORCES OF CONCENIRA7ED RUNOFF, SLOW THE VELOCITY OF CONCENTRATED RUNOFF WHILE KSAT WITH MODERATE WATER CAPACITY. ENHANCING THE P071EN77AL FOR /NFIL77?A770N, AND TO STABILIZE SLOPES WITH SEEPAGE 7B - BRADDOCK CLAY LOAM -27 TO 7% SLOPES. SOIL IS WELL DRAINED, W17H PROBLEMS, AND/OR NDN -COHESIVE SOILS. USE WHEREVER SOIL AND WATER INTERFACE AND MORE THAN 80 INCHES TO THE WATER TABLE. MADE FROM ALLUVIUM 77 -IE SOIL CONDITIONS, WATER TURBULENCE AND VELOCITY, EXPECTED VEGETA77VE COVER, ETC., AND COLLUVIUM DERIVED FROM ACID CRYSTALLINE ROCKS, THIS SOIL HAS ARE SUCH 7HAT 7HE SOIL MAY ERODE UNDER 7HE DESIGN FLOW COND177ONS CONVEX DOWN-SLOPE AND LINEAR ACROSS -SLOPE SHAPE. NO FREQUENCY OF PONDING OR FLOODING, HIGHt WATER CAPACITY, AND 3.31 TEMPORARY SEEDING MODERATELY HIGH TO HIGH KSAT. THE ESTABLISHMENT OF A TEMPORARY VEGETA77VE COVER ON DISTURBED AREAS BY SEEDING K17H APPROPRIATE RAPIDLY GROWING ANNUAL PLANTS. TO REDUCE EROSION AND 37C3 - HAYESVILLE CLAY LOAM -77 TO 159. SLOPES'. SOIL IS WELL DRAINED, SEDIMENTATION BY STABILIZING DISTURBED AREAS THAT WILL NOT BE BROUGHT TO FINAL WITH MORE THAN 80 INCHES TO THE WA7FR TABLE MADE FROM (@ TEMPORARY # BERM SEDIMENT BASIN BAFFLE DETAIL NO SCALE SHEETS OF 4 x8'xj' EXTERIOR /_ PLYWOOD OR EQUIVALENT 6" I 11 1 1 I'''(�RISER CREST ELEVA77ON I II II I I ii 4 ii 1 1 1 1 1 I POSTS MIN. SIZE 4" SQUARE OR 5" ROUND. SET AT r -------------------------------- [ �81 LEAST 3' INTO THE GROUND MORE THAN 80 INCHES TO THE WATER TABLIE• MADE FROM RESIDUUM WEATHERED FROM GRANITE AND GNEISS, THIS SOIL HAS CONVEX DOWN-SLOPE AND CONVEX ACROSS -SLOPE SHAPE. NO FREQUENCY OF PONDING OR FLOODING, HIGH WATER CAPACIFY, AND MODERATELY HIGH TO HIGH KSA T. 77 - RIVERVIEW CHEWACLA COMPLEX -OX TO 29. SLOPES. SOIL 1S WELL DRAINED, WITH MORE THAN 80 INCHES TO THE WATER TABLE. MADE FROM ALLUVIUM DERIVED FROM IGNEOUS ROCK, THIS SOIL HAS LINEAR DOWN-SLOPE AND LINEAR ACROSS -SLOPE SIHAPE. NO FREQUENCY OF PONDING AND OCCASIONAL FREQUENCY OF FLOODING, HIGH WATER CAPACITY, AND MODERA TEL Y HIGH TO HIGH ACSA T. 1. SET POSTS AND EXCA VA TE A 4 "X4" TRENCH UPSLOPE ALONG 'THE LINE OF POSTS. -- i--- - I L ! _ -� /,;I -: I I- r - -—_ �I-j��=; �; II -. FLOW - i i- ; i l- . I PURPOSE THE PURPOSE OF THIS LAND -DISTURBING ACTIVITY 1S TO CREATE PHASE 11 -IV OF THE WESTLAKE HILLS SUBDIVISION. THE TOTAL ACREAGE TO BE DISTURBED WITH THIS PLAN IS 51.14 ACRES EXISTING 51 7E CONDITIONS: THE EXIS77NG SITE IS A VACANT HILLY PARCEL. TWO EXISTING STREAMS RUN NORTH -SOUTH THROUGH THE SITE. THE SITE IS GENERALLY WELL DRAINED WITH SOME CRI77CAL SLOPES EROSION AND SEDIMENT CONTROL MEASURES HAVE BEEN DESIGNED TO CONFORM TO THE EXISTING S17F SLOPE AND PROTECT THE PERIMETER STREAMS AND ADJACENT PROPERTIES. ADJACENT AREAS: THE SITE IS POSITIONED BETWEEN ROUTES 240 AND 250 AND IS ALONG THE MASTER PLANNED CROZET CONNECTOR ROAD CORRIDOR. IT IS BORDERED BY FOOTHILLS CROSSING TO THE NORTH, WESTHALL TO THE WEST, VACANT LAND TO THE SOUTH, AND WESTERN RIDGE TO THE EAST. OFFS/TE LAND DISTURBANCE: NONE CRI TICAL AREAS: CRITICAL SLOPES ON-SITE WILL BE PROTECTED. CARE WILL BE TAKEN TO PREVENT THE EROSION AND SEDIMENTATION OF THE EXISTING GRADE AND TO PR07ECT THE EXISTING STREAM ON-SITE AND NEIGHBORING PROPERTIES. SO SEE SOILS BOUNDARIES ON THE EROSION AND SEDIMENT CONTROL PLAN PHASE 1 SHEET, AND DESCRIPTIONS ON THIS SHEET SEQUENCE OF C0NS77?UC7I0N: 1. NOTIFY ALBEMARLE COUNTY TO SCHEDULE A PRE-C0NS7RUC770N MEE77NG AS REQUIRED. 2. NO EROSION CONTROL MEASURES MAY BE REMOVED DURING THE CONS7RUCTION PROCESS WITHOUT THE APPROVAL FROM THE INSPECTOR ON THE PROJECT. 3. CONTRACTOR SHALL INSTALL TREE PROTECTION FENCING BEFORE ANY SITE DISTURBANCE SHALL TAKE PLACE. CON7RACTOR SHALL USE TREE PROTEC77ON FENCING TO STAKE OUT THE LIMITS OF CLEARING AND DISTURBANCE ON-SITE. CONTRACTOR .SHALL ENSURE 774AT TREES TO BE SAVED ARE FLAGGED ALONG THE L/Ml TS OF CLEARING M177GA77ON PLANTINGS SHALL BE INSTALLED WITHOUT ANY CLEARING OF EXIS77NG TREESS, 4. INSTALL THE PAVED CONS7RUCTION ENTRANCE WITH WASH RACK AS SHOWN ON THE PLANS CONSTRUCTION EN7RANCE TO BE INSTALLED WHERE CONSTRUC77ON VEHICLE ROUTES INTERSECT PAVED PUBLIC ROADS, PROVISIONS SHALL BE MADE TO MINIMIZE THE TRANSPORT OF SEDIMENT BY (VEHICULAR) TRACKING ONTO THE PAVED SURFACE. WHERE SEDIMENT IS 7RANSPORTED ONTO A PUBLIC ROAD SURFACE, THE ROAD SHALL BE CLEANED THOROUGHLY AT THE END OF EACH DAY. SEDIMENT SHALL BE REMOVED FROM THE ROADS BY SHOVELING OR SWEEPING AND TRANSPOR77NG TO A SEDIMENT CONTROL DISPOSAL AREA. S7REET WASHING SHALL BE ALLOWED ONLY AFTER SEDIMENT IS REMOVED IN THIS MANNER. INSTALL THE WASH RACK UPHILL FROM PROPOSED SEDIMENT TRAP #1. ACSA WILL DETERMINE THE APPROPRIATE METHOD OF SUPPLYING THE WASH RACK. PARKING AND CONSTRUCTION ENTRANCE AREAS SHALL BE CLEARED OF ALL VEGETATION, ROOTS, OR OTHER OBJEC77ONABLE MATERIALS BEFORE CONSTRUCTION ROAD STABILIZATION /S INSTALLED. 5. INSTALL THE IN177AL CONSTRUCTION MEASURES AS SHOWN ON THE PHASE I EROSION CONTROL PLAN SHEETS. THIS INCLUDES 5 SEDIMENT BASINS AND 1 SEDIMENT TRAP, SILT FENCE, AND DIVERSION DIKES SHALL ALSO BE INSTALLED AT THIS TIME. STABILIZATION MEASURES SHALL BE APPLIED TO EARTHEN STRUCTURES SUCH AS DAMS, DIKES, AND DIVERSIONS IMMEDIATELY AFTER INSTALLATION. MEASURES INTENDED TO TRAP SEDIMENT SHALL BE CONSTRUCTED AS A FIRST STEP WITH ANY LAND DISTURBANCE ACTIVITY AND SHALL BE MADE FUNCTIONAL BEFORE UPSLOPE LAND DISTURBANCE TAKES PLACE. 6. INSTALL ANY REMAINING EROSION CONTROL ITEMS AS SHOWN ON THE PHASE I EROSION CONTROL PLAN. Z ONCE ALL THE EROSION CONTROL ITEMS HAVE BEEN INSTALLED AS SHOWN ON 7HE PHASE ! EROSION CONTROL PLAN AND THE INSPECTOR HAS APPROVED THE EROSION CONTROL MEASURES, THE CON7RACTOR CAN BEGIN GRADING OPERATIONS. 8. ROUGH GRADE THE SITE TO THE CONTOURS SHOWN ON THE EROSION CONTROL PLAN. 9. PERMANENT OR TEMPORARY SOL STABILIZATIONE 1 SHA LLB APPLIED TO DENUDED AREAS WITHIN SEVEN DAYS AFTER FINAL GRADE IS REACHED ON ANY POR77ON OF THE SITE. TEMPORARY SOIL STABILIZATION SHALL BE APPLIED WITHIN SEVEN DAYS TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED) FOR LONGER THAN 30 DAYS PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS 17 -IAT ARE TO BE LEFT DORMANT FOR MORE THAN ONE YEAR. 10. INSTALL THE CONSTRUC77ON MEASURES AS SHOWN ON 7HE PHASE 11 EROSION CONTROL PLAN SHEETS. MEASURES INTENDED TO TRAP SEDIMENT'' SHALL BE C0NS7RUC7ED AS A FIRST STEP WITH ANY LAND DISTURBANCE ACTIVITY AND SHALL BE MADE FUNC77ONAL BEFORE UPSLOPE LAND DISTURBANCE TAKES PLACE. REMOVE SEDIMENT TRAP #1. 11. INSTALL THE UTILITIES, CURB AND GUTTER, AND ROADS. INLET PROTECTION SHALL BE INSPECTED AFTER EACH RAINFALL EVENT AND REPAIRS SHALL BE MADE AS NEEDED. IF THE STONE FILTER BECOMES CLOGGED WITH SEDIMENT SO THAT IT NO LONGER ADEQUA TEL Y PERFORMS ITS FUNCTION, THE STONE MUST BE PULLED AWAY AND CLEANED AND/OR REPLACED. INSTALL ANY REMAINING EROSION CONTROL ITEMS AS SHOWN ON THE PHASE II EROSION CONTROL PLAN. 12. ONCE PHASE H OF CONSTRUC77ON IS COMPLETE, THE SITE IS STABILIZED AND THE INSPECTOR HAS GIVEN APPROVAL, THE CONTRACTOR CAN REMOVE THE EROSION CONTROL MEASURES. NO ITEM SHALL BE REMOVED UNLESS THE UPSTREAM AREAS ARE STABILIZED AND THE INSPECTOR GIVES PERMISSION. 13 MAINTAIN ALL EROSION CON7ROL MEASURES AS SPECIFIED IN THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, REMOVING ONLY WHEN APPROVED BY THE LOCAL PROGRAM ADMINISTRATOR IN ACCORDANCE WM7H THE VIRGINIA EROS/04N AND SEDIMENT CONTROL HANDBOOK. 14. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WTHIN 30 DAYS AFTER FINAL SITE STABILIZATION OR AFTER THE TEMPORARY MEASURES ARE NO LONGER NEEDED, UNLESS OTHERWISE AUTHORIZED BY THE LOCAL PROGRAM ADMINISTRATOR. TRAPPED SEDIMENT AND THE DISTURBED SOIL AREAS RESUL77NG FROM THE DISPOSITION OF TEMPORARY MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT FURTHER EROSION AND SEDIMENT4774N. 11 F , .., � 11 .^" yRAND;; 2. STAPLE WIRE FENCING TO THE POSTS. SILT FENCE 0 (WI TH WIRE SUPPORT NO SCALE 3. ATTACH THE FILTER FABRIC TO THE WIRE FENCE AND EXTEND IT INTO THE TRENCH. FLOW 4. BACKFILIL AND COMPACT THE EXCA VA TED SOIL. EXTENSION OF FABRIC AND WIRE INTO THE TRENCH. N-cucu eINLET CONCRETE BLOCK WIRE SCR£E,.IV - GRAVEL' RL7ER OR ,#5 COARSE AGGREGA7Z. aBLOCK & GRAVEL CURB INLET SEDIMENT FILTER 3Ea NO SCALE ATTACH FILTER FABRIC TO STAKES OR POSTS & EXTEND IT INTO TRENCH WOODEN STAKE OR STEEL POST LENGTH = 5' MIN. EXCAVATED SOIL BACKFILLED AND COMPACTED 4"x4' TRENCH J SIL T FENCE sF (WITHOUT WIRE SUPPOR,).05- NO SCALE SAFETY FENCE PERSPECTIVE VIEW } ` --:# Y r ht �k a ��... *itis r� r. x� E:, +1 . w:vt�:E.• , E , •.E«E.•, ,.E.PE,•:Y : g.•I •+• .• �. .� r�. .." .. .�.•.'.•yl h ,4 ...,. y ,. :Ti::•''lv S+::� 1 f• •" Nom•• sY . I � I PERSPECTIVE VIEW I>ERSPECTIVE VIEW pLASTiG I"ENCE METAL FENCE Adapted from CYsltwed Plasiier and IPlate 3.111-1 YD0 T Hoa iutsibjWzt tandards .�. GRADE FOR A PERIOD OF MORE THAN 30 DAYS. TO REDUCE DAMAGE FROM SEDIMENT AND 11 RESIDUUM WEATHERED FROM GRANDE AND GNEISS, THIS SOIL HAS 50150 Mix of RUNOFF TO DOWNSTREAM OR OFF-SITE AREAS, AND TO PROVIDE PR07ECTION TO BARE SOILS d1 CONVEX DOWN-SLOPE AND CONVEX ACROSS --SLOPE SHAPE. NO (i olium mule florum) EXPOSED DURING CO>N57RU077ON UN77L PERMANENT VEGETATION OR OTHER EROSION CONTROL & FREQUENCY OF PONDING OR FLOODING, HIGHI WATER CAPACITY, AND >i TAL LBS MEASURES CAN BE ESTABLISHED. i i1 I�I MODERATELY HIGH TO HIGH KSAT: tUEF1LL. SLOPE (3•.t O�t�.SSI PER 3 32 PERMANENT ST,ABiL/ZA RON. 37D3 - HAYESVILLE CLAY LOAM -157 TO 257 SLOPES. SOIL IS WELL DRAINED, KENTUCKY 31 FESCUE 128 LBS. THE ESTABLISHMENT OF PERENNIAL VEGETA77VE COVER ON DISTURBED AREAS BY PLAN77NG ABOVE GRADE AND 4' WITH MORE THAN 80 INCHES TO THE WATER TABLE. MADE FROM RED TOP GRASS 2 LBS. SEED. TO REDUCE E=ROSION AND DECREASE SEDIMENT YIELD FROM DISTURBED AREAS. TO TING RESIDUUM WEATHERED FROM GRANITE AND GNEISS, THIS SOIL HAS SEASONAL NURSE CROP 20 LBS. PERMANENTLY STAB11LIZE DISTURBED AREAS IN A MANNER THAT IS ECONOMICAL, ADAPTABLE TO f ;MI: . CONVEX DOWN-SLOPE AND CONVEX ACROSS -SLOPE SHAPE. NO 0 LU S17E CONDITIONS, AND ALLOWS SELECTION OF THE MOST APPROPRIATE PLANT MATERIALS. TO ice. CURB OR FREQUENCY OF PONDING OR FLOODING, HIGH' WATER CAPACITY, AND 15O LBS SEASONAL NURSE CROP IMPROVE WILDLIFE HABITAT TO ENHANCE NATURAL BEAUTY. UPON COMPLE77ON OF > w MODERATELY HIGH TO HIGH KSAT. Ew rr •' CONS7RUC770N AC77W477ES, ALL AREAS WILL RECEIVE A PERMANENT VEGETATIVE COVER. , FEBRUARY 16 THROUGH APRIL ANNUAL RYE r jI 1 I }'I �+ R/VERVIEW LOAM -09. TO 27 SLOPES SOIL l,S WELL DRAINED, WITH MORE MAY 1 THROUGH AUGUST 15 FOXTAIL MILLET 3.38 TREE PRESERVA177ON AND PRO ZECTION. 76 - THAN 80 INCHES TO THE WATER TABLE MAIDE FROM ALLUVIUM DERIVED AUGUST 16 THROUGH OCTOBER ANNUAL RYE PROTECTION OF DESIRABLE 7REES FROM MECHANICAL OR OTHER INJURY DURING LAND FROM IGNEOUS ROCK, THIS SOIL HAS LINEAR' DOWN-SLOPE AND LINEAR NOVEMBER THROUGH FEBRUARY 15 WINTER RYE DISTURBING AND CONSTRUCTON AC77WTY. TO ENSURE THE SURVIVAL OF DESIRABLE TREES 11 ACROSS -SLOPE SHAPE. NO FREQUENCY OF PONDING & OCCASIONAL NOTES: WHERE 7HEY WILL BE EFFEC77VE FOR EROSION AND SEDIMENT CONTROL, WATERSHED FREQUENCY OF FLOODING, HIGH WATER CAPACITY, AND MODERATELY PROTECTION, LANDSCAPE BEAUTIFICA77ON, DUST AND POLLU77ON CONTROL, NOISE REDUCTION, HIGH TO HIGH KSAT. 1. LIME AND FERTILIZER NEEDS SHALL BE DETERMINED BY SOIL SHADE AND 07HER ENVIRONMENTAL BENEFITS WHILE 7HE LAND IS BEING CONVERTED FROM TESTS AND APPLIED IN ACCORDANCE WITH VESCH STD. 3.32. FOREST TO URBAN -)TYPE USES APPLIES /N 7REE-INHAB17E'D AREAS SUBJECT TO LAND CHEWACLA SILT LOAM -07 TO 29 SLOPES SOIL IS SOMEWHAT POORLY 2. SEEDINGS TO BE MULCHED IMMEDIATELY UPON COMPLETION DISTURBING ACT114TIE.S 16 - DRAINED, WITH MORE THAN 80 INCHES TO THE WATER TABLE. MADE OF SEED APPLICATION, IN ACCORDANCE W/ VESCH STD 3.35, FROM RESIDUUM WEATHERED FROM GRANITE ,AND GNEISS, THIS SOIL HAS 3.39 DUST CONTROL:- LINEAR DOWN-SLOPE AND LINEAR ACROSS -SLOPE SHAPE. NO PERMANENT SEEDING SCHEDULE REDUCING SURFACE SAND AIR MOVEMENT OF DUST DURING LAND DISTURBING, DEMOLITION AND FREQUENCY OF PONDING & OCCASIONAL FREQUENCY OF FLOODING, HIGH PS CONSTRUC77ON ACTIVITIES. TO PREVENT SURFACE AND AIR MOVEMENT OF DUST FROM WATER CAPACITY, AND MODERATELY HIGH TO HIGH KSAT. NO SCALE EXPOSED SOIL SURFACES AND REDUCE THE PRESENCE OF AIRBORNE SUBSTANCES WHICH MAY PRESENT HEALTH HAZARDS, TRAFFIC SAFETY PROBLEMS OR HARM ANIMAL OR PLANT LIFE. 36B - HAYESVILLE LOAM -29 TO 77 SLOPES. SOIL IS WELL DRAINED, WITH {STI}, & SPEC. 3.32 OF VIRGINIA EROSION & DUST CON7ROL MEASURES SHALL BE EMPLOYED TO PREVENT SURFACE AND AIR MOVEMENT OF MORE THAN 80 INCHES TO THE WATER TABLIEE, MADE FROM RESIDUUM SEDIMENT CONTROL HANDBOOK, 3RD ED.) DUST DURING CONSTRUCTION. MEASURES EMPLOYED SHALL BE IN ACCORDANCE WITH THE WEATHERED FROM GRANITE AND GNEISS, THIS' SOIL HAS CONVEX VESCH. DOWN-SLOPE AND CONVEX ACROSS -SLOPE SHAPE. NO FREQUENCY OF PONDING OR FLOODING, HIGH WATER CAPAC17FY, AND MODERATELY HIGH TO HIGH KSAT. 36C - HAYESVILLE LOAM -77 TO 157 SLOPES. SOIL. IS WELL DRAINED, WITH (@ TEMPORARY # BERM SEDIMENT BASIN BAFFLE DETAIL NO SCALE SHEETS OF 4 x8'xj' EXTERIOR /_ PLYWOOD OR EQUIVALENT 6" I 11 1 1 I'''(�RISER CREST ELEVA77ON I II II I I ii 4 ii 1 1 1 1 1 I POSTS MIN. SIZE 4" SQUARE OR 5" ROUND. SET AT r -------------------------------- [ �81 LEAST 3' INTO THE GROUND MORE THAN 80 INCHES TO THE WATER TABLIE• MADE FROM RESIDUUM WEATHERED FROM GRANITE AND GNEISS, THIS SOIL HAS CONVEX DOWN-SLOPE AND CONVEX ACROSS -SLOPE SHAPE. NO FREQUENCY OF PONDING OR FLOODING, HIGH WATER CAPACIFY, AND MODERATELY HIGH TO HIGH KSA T. 77 - RIVERVIEW CHEWACLA COMPLEX -OX TO 29. SLOPES. SOIL 1S WELL DRAINED, WITH MORE THAN 80 INCHES TO THE WATER TABLE. MADE FROM ALLUVIUM DERIVED FROM IGNEOUS ROCK, THIS SOIL HAS LINEAR DOWN-SLOPE AND LINEAR ACROSS -SLOPE SIHAPE. NO FREQUENCY OF PONDING AND OCCASIONAL FREQUENCY OF FLOODING, HIGH WATER CAPACITY, AND MODERA TEL Y HIGH TO HIGH ACSA T. 1. SET POSTS AND EXCA VA TE A 4 "X4" TRENCH UPSLOPE ALONG 'THE LINE OF POSTS. -- i--- - I L ! _ -� /,;I -: I I- r - -—_ �I-j��=; �; II -. FLOW - i i- ; i l- . I PURPOSE THE PURPOSE OF THIS LAND -DISTURBING ACTIVITY 1S TO CREATE PHASE 11 -IV OF THE WESTLAKE HILLS SUBDIVISION. THE TOTAL ACREAGE TO BE DISTURBED WITH THIS PLAN IS 51.14 ACRES EXISTING 51 7E CONDITIONS: THE EXIS77NG SITE IS A VACANT HILLY PARCEL. TWO EXISTING STREAMS RUN NORTH -SOUTH THROUGH THE SITE. THE SITE IS GENERALLY WELL DRAINED WITH SOME CRI77CAL SLOPES EROSION AND SEDIMENT CONTROL MEASURES HAVE BEEN DESIGNED TO CONFORM TO THE EXISTING S17F SLOPE AND PROTECT THE PERIMETER STREAMS AND ADJACENT PROPERTIES. ADJACENT AREAS: THE SITE IS POSITIONED BETWEEN ROUTES 240 AND 250 AND IS ALONG THE MASTER PLANNED CROZET CONNECTOR ROAD CORRIDOR. IT IS BORDERED BY FOOTHILLS CROSSING TO THE NORTH, WESTHALL TO THE WEST, VACANT LAND TO THE SOUTH, AND WESTERN RIDGE TO THE EAST. OFFS/TE LAND DISTURBANCE: NONE CRI TICAL AREAS: CRITICAL SLOPES ON-SITE WILL BE PROTECTED. CARE WILL BE TAKEN TO PREVENT THE EROSION AND SEDIMENTATION OF THE EXISTING GRADE AND TO PR07ECT THE EXISTING STREAM ON-SITE AND NEIGHBORING PROPERTIES. SO SEE SOILS BOUNDARIES ON THE EROSION AND SEDIMENT CONTROL PLAN PHASE 1 SHEET, AND DESCRIPTIONS ON THIS SHEET SEQUENCE OF C0NS77?UC7I0N: 1. NOTIFY ALBEMARLE COUNTY TO SCHEDULE A PRE-C0NS7RUC770N MEE77NG AS REQUIRED. 2. NO EROSION CONTROL MEASURES MAY BE REMOVED DURING THE CONS7RUCTION PROCESS WITHOUT THE APPROVAL FROM THE INSPECTOR ON THE PROJECT. 3. CONTRACTOR SHALL INSTALL TREE PROTECTION FENCING BEFORE ANY SITE DISTURBANCE SHALL TAKE PLACE. CON7RACTOR SHALL USE TREE PROTEC77ON FENCING TO STAKE OUT THE LIMITS OF CLEARING AND DISTURBANCE ON-SITE. CONTRACTOR .SHALL ENSURE 774AT TREES TO BE SAVED ARE FLAGGED ALONG THE L/Ml TS OF CLEARING M177GA77ON PLANTINGS SHALL BE INSTALLED WITHOUT ANY CLEARING OF EXIS77NG TREESS, 4. INSTALL THE PAVED CONS7RUCTION ENTRANCE WITH WASH RACK AS SHOWN ON THE PLANS CONSTRUCTION EN7RANCE TO BE INSTALLED WHERE CONSTRUC77ON VEHICLE ROUTES INTERSECT PAVED PUBLIC ROADS, PROVISIONS SHALL BE MADE TO MINIMIZE THE TRANSPORT OF SEDIMENT BY (VEHICULAR) TRACKING ONTO THE PAVED SURFACE. WHERE SEDIMENT IS 7RANSPORTED ONTO A PUBLIC ROAD SURFACE, THE ROAD SHALL BE CLEANED THOROUGHLY AT THE END OF EACH DAY. SEDIMENT SHALL BE REMOVED FROM THE ROADS BY SHOVELING OR SWEEPING AND TRANSPOR77NG TO A SEDIMENT CONTROL DISPOSAL AREA. S7REET WASHING SHALL BE ALLOWED ONLY AFTER SEDIMENT IS REMOVED IN THIS MANNER. INSTALL THE WASH RACK UPHILL FROM PROPOSED SEDIMENT TRAP #1. ACSA WILL DETERMINE THE APPROPRIATE METHOD OF SUPPLYING THE WASH RACK. PARKING AND CONSTRUCTION ENTRANCE AREAS SHALL BE CLEARED OF ALL VEGETATION, ROOTS, OR OTHER OBJEC77ONABLE MATERIALS BEFORE CONSTRUCTION ROAD STABILIZATION /S INSTALLED. 5. INSTALL THE IN177AL CONSTRUCTION MEASURES AS SHOWN ON THE PHASE I EROSION CONTROL PLAN SHEETS. THIS INCLUDES 5 SEDIMENT BASINS AND 1 SEDIMENT TRAP, SILT FENCE, AND DIVERSION DIKES SHALL ALSO BE INSTALLED AT THIS TIME. STABILIZATION MEASURES SHALL BE APPLIED TO EARTHEN STRUCTURES SUCH AS DAMS, DIKES, AND DIVERSIONS IMMEDIATELY AFTER INSTALLATION. MEASURES INTENDED TO TRAP SEDIMENT SHALL BE CONSTRUCTED AS A FIRST STEP WITH ANY LAND DISTURBANCE ACTIVITY AND SHALL BE MADE FUNCTIONAL BEFORE UPSLOPE LAND DISTURBANCE TAKES PLACE. 6. INSTALL ANY REMAINING EROSION CONTROL ITEMS AS SHOWN ON THE PHASE I EROSION CONTROL PLAN. Z ONCE ALL THE EROSION CONTROL ITEMS HAVE BEEN INSTALLED AS SHOWN ON 7HE PHASE ! EROSION CONTROL PLAN AND THE INSPECTOR HAS APPROVED THE EROSION CONTROL MEASURES, THE CON7RACTOR CAN BEGIN GRADING OPERATIONS. 8. ROUGH GRADE THE SITE TO THE CONTOURS SHOWN ON THE EROSION CONTROL PLAN. 9. PERMANENT OR TEMPORARY SOL STABILIZATIONE 1 SHA LLB APPLIED TO DENUDED AREAS WITHIN SEVEN DAYS AFTER FINAL GRADE IS REACHED ON ANY POR77ON OF THE SITE. TEMPORARY SOIL STABILIZATION SHALL BE APPLIED WITHIN SEVEN DAYS TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED) FOR LONGER THAN 30 DAYS PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS 17 -IAT ARE TO BE LEFT DORMANT FOR MORE THAN ONE YEAR. 10. INSTALL THE CONSTRUC77ON MEASURES AS SHOWN ON 7HE PHASE 11 EROSION CONTROL PLAN SHEETS. MEASURES INTENDED TO TRAP SEDIMENT'' SHALL BE C0NS7RUC7ED AS A FIRST STEP WITH ANY LAND DISTURBANCE ACTIVITY AND SHALL BE MADE FUNC77ONAL BEFORE UPSLOPE LAND DISTURBANCE TAKES PLACE. REMOVE SEDIMENT TRAP #1. 11. INSTALL THE UTILITIES, CURB AND GUTTER, AND ROADS. INLET PROTECTION SHALL BE INSPECTED AFTER EACH RAINFALL EVENT AND REPAIRS SHALL BE MADE AS NEEDED. IF THE STONE FILTER BECOMES CLOGGED WITH SEDIMENT SO THAT IT NO LONGER ADEQUA TEL Y PERFORMS ITS FUNCTION, THE STONE MUST BE PULLED AWAY AND CLEANED AND/OR REPLACED. INSTALL ANY REMAINING EROSION CONTROL ITEMS AS SHOWN ON THE PHASE II EROSION CONTROL PLAN. 12. ONCE PHASE H OF CONSTRUC77ON IS COMPLETE, THE SITE IS STABILIZED AND THE INSPECTOR HAS GIVEN APPROVAL, THE CONTRACTOR CAN REMOVE THE EROSION CONTROL MEASURES. NO ITEM SHALL BE REMOVED UNLESS THE UPSTREAM AREAS ARE STABILIZED AND THE INSPECTOR GIVES PERMISSION. 13 MAINTAIN ALL EROSION CON7ROL MEASURES AS SPECIFIED IN THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, REMOVING ONLY WHEN APPROVED BY THE LOCAL PROGRAM ADMINISTRATOR IN ACCORDANCE WM7H THE VIRGINIA EROS/04N AND SEDIMENT CONTROL HANDBOOK. 14. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WTHIN 30 DAYS AFTER FINAL SITE STABILIZATION OR AFTER THE TEMPORARY MEASURES ARE NO LONGER NEEDED, UNLESS OTHERWISE AUTHORIZED BY THE LOCAL PROGRAM ADMINISTRATOR. TRAPPED SEDIMENT AND THE DISTURBED SOIL AREAS RESUL77NG FROM THE DISPOSITION OF TEMPORARY MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT FURTHER EROSION AND SEDIMENT4774N. 11 F , .., � 11 .^" yRAND;; 2. STAPLE WIRE FENCING TO THE POSTS. SILT FENCE 0 (WI TH WIRE SUPPORT NO SCALE 3. ATTACH THE FILTER FABRIC TO THE WIRE FENCE AND EXTEND IT INTO THE TRENCH. FLOW 4. BACKFILIL AND COMPACT THE EXCA VA TED SOIL. EXTENSION OF FABRIC AND WIRE INTO THE TRENCH. N-cucu eINLET CONCRETE BLOCK WIRE SCR£E,.IV - GRAVEL' RL7ER OR ,#5 COARSE AGGREGA7Z. aBLOCK & GRAVEL CURB INLET SEDIMENT FILTER 3Ea NO SCALE ATTACH FILTER FABRIC TO STAKES OR POSTS & EXTEND IT INTO TRENCH WOODEN STAKE OR STEEL POST LENGTH = 5' MIN. EXCAVATED SOIL BACKFILLED AND COMPACTED 4"x4' TRENCH J SIL T FENCE sF (WITHOUT WIRE SUPPOR,).05- NO SCALE SAFETY FENCE PERSPECTIVE VIEW } ` --:# Y r ht �k a ��... *itis r� r. x� E:, +1 . w:vt�:E.• , E , •.E«E.•, ,.E.PE,•:Y : g.•I •+• .• �. .� r�. .." .. .�.•.'.•yl h ,4 ...,. y ,. :Ti::•''lv S+::� 1 f• •" Nom•• sY . I � I PERSPECTIVE VIEW I>ERSPECTIVE VIEW pLASTiG I"ENCE METAL FENCE Adapted from CYsltwed Plasiier and IPlate 3.111-1 YD0 T Hoa iutsibjWzt tandards .�. TABLE 3.31-B ACCEPTABLE TEMPORARY SEEDING PLANT MATERMJS "QUICK REFERENCE FOR ALL REGIONS" plani -aa Sept I - Feb. 15 Feb. 16 - Apr. 30 May 1 - Aug 31 Source: 'Va. DSWC • • 11 v ♦. �/. 50150 Mix of DESIGN WATER d1 1 w (i olium mule florum) +' & 50-100 Cereal (Wiatet) Rye 70' MIN. 3" SIA -2A ASflNLT TOP COURS�2%- i i1 I�I 1 ll { i i1 R i .;1,., .aY i'YIi { -� 4 I.....; ) (`I if �YT 1 �� i Ii;f 1{$j �'. ABOVE GRADE AND 4' Ill i l Ili- �. , .I l I -`-,"t I��j4,f.., TING SECTION A -A 0 U z CL 1 II ltYi f ;MI: . WITH A MINIMUM WASH HOSE DIA. OF 1.5' 0 LU 3 PAVW TEMP CONST FAIR ice. CURB OR /- ASP uPYwx PnvEo wASMYthCK 1 EDGE OF PAV'T > w {% Ew rr •' , w i rr,rr y 4 , - _ r jI 1 I }'I �+ w « �r..r ,. rr. r!« ✓ { j11 fI I - •- on 11 ------- a- 101 M I.. � I '" ifl.' #• #. TABLE 3.31-B ACCEPTABLE TEMPORARY SEEDING PLANT MATERMJS "QUICK REFERENCE FOR ALL REGIONS" plani -aa Sept I - Feb. 15 Feb. 16 - Apr. 30 May 1 - Aug 31 Source: 'Va. DSWC German Millet 50 (&Aaria italic) Rate Species Ibs. acre 50150 Mix of DESIGN WATER Annual Ryegrm DRAWME SMUE me= HAw (i olium mule florum) & 50-100 Cereal (Wiatet) Rye 70' MIN. 3" SIA -2A ASflNLT TOP COURS�2%- (5�e ) SET 1 1/2" WATER Annual Ryegrass 60-100 l' v i- ortr ) PROOF HYDRANT 3' German Millet 50 (&Aaria italic) DIVERSION DITCH MINIMUM "T,AT ALBEMARLE COUNTY i z CONSTRUCTION ENTRANCE DESIGN WATER DRAWME SMUE me= HAw w ,O SEaIMERr &4M MUST EXTEND FULL WIDTH OF 70' MIN. 3" SIA -2A ASflNLT TOP COURS�2%- INGRESS AND EGRESS OPERATION SET 1 1/2" WATER „„. 2ISTING HYDRANT WITH FROST . 12' MIN. PROOF HYDRANT 3' PAVEMENT ABOVE GRADE AND 4' 6' 21A DIVERSION DITCH SIDE ELEVATION AGGREGATE BASE TING SECTION A -A 0 U z CL UND 70' MYH. WITH A MINIMUM WASH HOSE DIA. OF 1.5' 0 LU 3 PAVW TEMP CONST FAIR ice. CURB OR /- ASP uPYwx PnvEo wASMYthCK 1 EDGE OF PAV'T > w w 12' MIN. -23 EXISTING w 2%--•- t PAVEMENT DIVERSION DITCH MINIMUM "T,AT "4F"�"" NAW T O SE g i z 1- DESIGN WATER w w ELEVATION IS 4.0' PLAN VIEW MUST EXTEND FULL WIDTH OF INGRESS AND EGRESS OPERATION SET 1 1/2" WATER J HYDRANT WITH FROST . 12' MIN. PROOF HYDRANT 3' Uj ABOVE GRADE AND 4' z _.,, OFF EDGE OF PAVEMENT. c=n _j SECTION A -A 0 U z CL NOTE: A MINIMUM WATER TRAP OF 1" IS REQUIRED w WITH A MINIMUM WASH HOSE DIA. OF 1.5' 0 LU 3 PAVW TEMP CONST FAIR Sw N.T.S. !Tau 0F (:0-v �'� SCOTT/R. COLLINS � -) No. 35791 ,2__- �1�W�IONAL�1� z 0 a U En LU 0 z 0 Ln > Z LU F- a 0� H H W Ce ,,, -,4- -q i1 " 1-i , � N . w - o 0) ICY) 1 CF) N M Nt >I 0 N N w J W � 0/ i.... tr V >I Y- �__ D U) F_ W ry U) i w 0. ry �< V O N 7 _j :� < 0 I- � o Iz L a LLJ 0>1 C 0 CL L _ �p O !�Y/l LIJ >m Q Q P-4 .n o z �z_ o= 66 � -Cw w ar 9 N Z P-1 C: P �,� a w ~L Z � '� a =l 1-- 4 •� o IE --4. I L v o w L' y N O W 0 o C' 3 N C C o U z a) C U (1) n 6 0� o �;: � Q) N 0 '" -0x x C:� H E � o a � U - 0.�i n z , Uj 0,� w w w +, z �' C z o w � 06 U w w Z z J C 'J O 3, o U U _ L '� " O �, C L C% 00 0. o 6 Q Lu > . In :5cf U O X _, -, N U 4 � � U) C w 0 O I-_ O t..) i _ N Q) �- � s 0' a- U} -0 - O JOB NO. Q) 11207,E U 0 > SCALE ° .6 -a s� 2 �+ I �� = 50' O C N= �Q) a SHEET NO. Q- o 1 Q)0 co o �� z z 1- w w 1w 0 a Ce J w a Uj I- z z Z � c=n _j 0 U LU LU 0 U z CL U) w ow w 0 LU 0 w U) > > w w w ,,, -,4- -q i1 " 1-i , � N . w - o 0) ICY) 1 CF) N M Nt >I 0 N N w J W � 0/ i.... tr V >I Y- �__ D U) F_ W ry U) i w 0. ry �< V O N 7 _j :� < 0 I- � o Iz L a LLJ 0>1 C 0 CL L _ �p O !�Y/l LIJ >m Q Q P-4 .n o z �z_ o= 66 � -Cw w ar 9 N Z P-1 C: P �,� a w ~L Z � '� a =l 1-- 4 •� o IE --4. I L v o w L' y N O W 0 o C' 3 N C C o U z a) C U (1) n 6 0� o �;: � Q) N 0 '" -0x x C:� H E � o a � U - 0.�i n z , Uj 0,� w w w +, z �' C z o w � 06 U w w Z z J C 'J O 3, o U U _ L '� " O �, C L C% 00 0. o 6 Q Lu > . In :5cf U O X _, -, N U 4 � � U) C w 0 O I-_ O t..) i _ N Q) �- � s 0' a- U} -0 - O JOB NO. Q) 11207,E U 0 > SCALE ° .6 -a s� 2 �+ I �� = 50' O C N= �Q) a SHEET NO. Q- o 1 Q)0 co o �� I ��,T i 0�0 6 , 1r,P � /� �1� 7 � P, % � 1�� � �_ " �; 7v C�'l �� iSCOTT'R. COLLINS ---" 0 �_� ( _1�1__l 1� No. 35791 I ,Q,- 1 114 1 �k 1 41, \�X Id ,,,:,�,�Nr V. � � 1�(�)�N�SIIIQNAL '�� z 0 L 0� u Ln uj n ::w 0 U-) � > w Q� - , _ ", I .11 .. _ . ­ � � - I / -, ­, — — — —_ I- , / ­ _� I I I / . 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Ico L T . . . . . . . . . -t- N�)TRUq :10SED 20' EARTHEN TION ENTRANCE ui ZGENCY SPILLWAY ��48.17 - 7 �4 CL. III RCP'RISER M=047.17 ICL. III RCP BARREL % LOT< )IMENT BASIN 2 �SE 11 �Ro S `20b�l -1 CLASS I /* 'T PROTECTION POSITIVE DR =0.43 13.5'; L=15; D=2.5' HIS �O Ic=9.6 m ......... 7 ..... /* 0) CN SFr ... in. c cy) 0 CL 14 SF 04 LOT, -7- JKU�'UbLIJ I U LAN I MtN MERGENCY SPILLWAY --�-2�SF z H./ 8" CL. III RcP­8ARREL .... Z. _z/// 0 I2 r I .&� A TY'F C D N BE 5F/ LLj C; 'AF INSTALL SIGNS "WARNING,. uj LLJ *Ak §AND, KEEP OUT'--- -2 2�F,-�' OSI I I VE DRAI G IAL� G DIVER N BERM P-4 V) Iuz w Iyu S ��AM. [ 0 A 0 L9 0 Lu Q) _0 \_P PRPOSED V:R*SION� _6E L=9'; D=1.4' ur) Q,\P\QSEP\, B ry CT CT POSITIVE . ..... .... x POSITIVE DRAINAGE qNq PIYERSI BERM.'.'.�' � 77 . . . . . . . . . . . . . . STON T �0 f6, _j w I YFH1 /* 'Wx5'Lx2'D u ....... w r AF L i 0 06 . . . . . . ul UJ z I...... uj 'EAR FLOC w A -1. -------- 0 U) 0 z . . . . . . LJ /* ;AFETY 0 7 PRO SED /* FENCE 0 NISTALL SIGNS "WARNING, SAF ....... . . . . . . ,:L> w 0 ... QUICK. SAND,. KEEP OUT" 0 w Ix PROP SED 2 CL. Ill RCP RISER O RIM=551.33 CL �a < >/ .............. .......... ... ... (D PROPOSED 24" CL. Ill RCP BARREL- I. . . . . . . . . . . . . =244 . . . . . . . . . . 0 0 .7, PROPOSED 62' EARTHEN., INV IN=542.00 7- F7 7 7- EMERGENCY SPILLWA .)NV OUT=540.78 N /* ELEV,=�52.�,3 x I . 7- - / - - j .' 7- -[-/-.-7 -7 VA S=0.5% I SS AIL 6 OSED SILT . . . . . w vcp 8rEp CkNGHOLE CREEK ws� I OUTLET P RW,�A' u czp Lu W W2=19'- L=13': D=1.4/ 71 E fkeCIPRO w F 0 f fr- o 9 -VH,82 - 9 �,A 7 7 0 /* 0 0 -0 JOB NO. TBM GRAPHIC SCALE 112072 320 0 80 0) 40 80 160 N' x ROPOSED --SILT A I --ENC E(S7F SCALE 1 80' 75 IN FEET L I inch 80 ft. SHEET NO. II_c _c: 12 II 1 I / I I " " "//' " ** .'11 " I- = �� �� � � 11, \ *% ­-♦ � �, - � ,♦- I , ' I---- I 1z I I I � � � 11 \ - 11% I I It . . I I - I I . � ,� 4** 1 1 . I _714�* I-,' -..W- p k '' �', \ ,�, ­_ , Z, , " Z 44`4� �, "-, _� Z z" , 11� "" / /// I x///z, , I I ----,.--- / 'Z , � \ \ Z , I/ �, -/ x I "--< - .1/ , // � I \ 'I / 11, � _____ I , " �,// I \ \ ____� �, . I 11 11 x . �, . .. . . 11 I , I ­_ -11- /r' -.--- ,///,/ I I _ ___� � I �, I ---/ , , , I/ / //: " / / , x 1. -',_� �-r ", / --,-- --- �1z . .. _ , ____1 / / . / �__z ,_ -_ 1 / -- " -1 ._ 11", z " " =, �, z /// I-, . . , +00. . . ..� , . 1-1 _ _11-1 _,_� __-, � 1-1 , ,, ,/ - mom .11 / / ♦ ---- --- , / I � � cr�/ 1, / .. 1. .. "I-, , FENCE PROPOSED SAFETY ' .. ""I.. / ) / NSTALL SIGNS "WARNING: � ,I / ** " i � I .4eQUICK SAND, I KEEP OUT" i I , / / 11 � , I 4-D // I .w 'I,' + ___ 1*k.+' p I Z _)�_ 00 00 PROPOSED 24" CL. III RCP RISER - �:4;;t. 0 I -, I / RIM=551.33 0 / I oto I i 1i 1 1 \ I I /A I I`NUI-'Uz3I-U Z4 UL. III NU' tJANNtL A 1 =244'; S=0.5% / I I NV IN=542.00 -I.-_____ - ------- ____ PROPOSED 62' EARTHEN __,,� I I NV OUT=540.78 __ - _T_ 7�- 7 __ EMERGENCY SPILLWAY" ­ J\ 1/1-1 ___/ _ __77 ____, - - -- /- ---/- - --- 7 ELEV.=552.33 - - - ------ ----- '-'---- _/ ---/ 7 - _7___ 1 I 11x "_ / / / / I / / /,N_--7..- � " - - - - - / / / / / / / //-/7--- \-/_---7--- //_ - - 7- -7- - - _T_ T -_ --A--- - N_ - - 7 -- --_/--- //// ---7- // / // // / / , / / - - , -, / / _ _ /_,- / / / / I/ I / / // // ///"--- / S / / / / /-- __ ----,-- - / __ -1V - 7L- - /-/ - __4 " T �_ -1 CLASS IT / P OPOSED -1 CASS Al1 �, S _� = 4 ___/� / / // RIPRAP OUTLET PROTECTIO, / I / / / / - JEX*H / / / RWS - ,A 1�,, VCp/$t-/S _�_-`� ___t -W1=6'; W2=19'; L=13'; D=1.4 , /01 I 1 _S__ /_ I W�R S -%�­-/­ S,/- I / CZ�M 7-'-7, . , / H 8 1 _­­--/-- ,74 --I _Z -,,- / / / / / / / / Y___�_ / -/- - /__ /' 1 4,wg� *,,�,, VOP -WER - - / -T / / - -----/ __4 - EXMH / ____� __L 7 - =41OW/ �- --:L-/ _/ - / 7 11-- - , I/ __ --;r � / / / / / CZ1MH-83 / / // / � I / / / - / / 11 __ __ / -_ - / / / / _,__ /X /------- I / // / / / /_- ___ / �, / / / / / / / i - : , I ­ / / / - _;b1:i:!!I1::/ / I/ I �___­ / / / / / / / / / / / / - I :1:: � / / i, / / // I I li / / I/ 11 2 / / /// / / / / / / / / _/'__ __ / / / / / / / / / " ­, / \ x / / ,�, / / / I/ / // / I/ ­ --- / _­­__­_// / // I � . ---- __ -111-- ­­_ / / / I - __ __ _ / - / / , ---�4_ , / / , ___ _�, - \1/ N�/ � x / / / / __ 7 - �" _X,___ - / -7'----,-/---- '_ '-7--,,--- 1 /' ­_ / / I / / - ./ / I I / , � , - / - �', / �,,,_,1,%, / , - ",.".*., I // / I/ .� 11 ­ PROPOSED 24" CL/. III RCP RISER � / / ...., ��,,� .-1 r /` / , / ", / ,/ / / :,:�,,� . / � I % / � . "I R�Y=541.50 SE'DIME'NT A SIN 05B-2 �� / , ".1"11-1 ..... - .).* J* _R 11 I / I 11 / 11 e / I .:��__ , 'X I/ I", ,� �/ 4e / , I 11 I 11 1, , "I I _�, I � .� ., / - SCAM 1 =40 I/ .. / /11 , /,//, ,-, / 1, � / 1 �.','*"7i I" / - / I � �,­: I , , '\\ // , ­- 7 . , , / , ", ­­ I / :',,-""'i � _-,-- / , , �5r"._ '. D 10' EARTHEN _ ., � _ . . I , . .// " I/ ,/ / // . I , . .�r, � �, MERGENCY SPILLWAY / LOT : 104, ' // f 11 / 11 I / ....� ., 9W / �- I � / / / / , . , / // / ­­ , ELEV.=542.50 / , 1, " � , ,,�.,- / , I / / / I.- / � ", _ , I � 20.0165. S F � . ,�, I/ / / / / ... , / 7 � . I / / . . i� � I � -\\,Q�,,/, , I / / / / /,/ -_ I F1 (?r / ,- I / I / / I F** I __`�� I .. �1_ - �/ z / / / / / / , ;//- � -­-, , P PROPOSED 18" CL.' III RCP BARREL �, / I ,/ / *1 .1 . ­� , /Z /,/ / / *1 =150'; S=0.5% � I _�, I - , ------- -- � --'\ --- \_ I -, , , < / .� ­ [�-.,2 . .. / INV IN=538.00 , ,/ - // I/ . // z 11 \\ 00, .�', .. / / � I x "I .. . _:,�)v 1 , / / . . .. INV OUT=5�7.25 � 11 _­___­ `�,-­ �,/ , .1 / , k / � / � � � � / , Z ', I., 4 / .. I . / / I . . x , / : 11 '"*� - � I/ I � / 'PROP -'\ " , �, " � / 11 - � x . I I I '" . . . , - D SAFETY ,---,I-- / ", , , I . . .. - 14.�O� ..._ / I -' � ,/ I . . ... I . � . , / ___Xft� I INSTALL SIGNS "WARNIN G. // . , � , - ,,, Z��/ � ,.'. 7 - I , I .. . �. I - . ftft� I QUICK SAND, KEEP OUT )I- -,, ", 11 Z I .- . , . . "W-0 aft / . _�--X�_-,__ -- - I , " Z .. . lz, ------ / I � . - . ____ , - . \_�__,\ - ___­ I / .�. . ... I 11 // I i ­\__ - I .- I 'I-"----- -1 __ - . - I T _ I __ -X__ _ " _,­�'A 11 // I I - i / I 1 � . �,., ,I . - . ­ � " � ..", .. ,---' � 41 �1111 I / Y, ,�. - ;1 I , 'o;IF - . I ,,-' K*A100 1� f -, , , , , - , , , , , � � � j.I... - � 1.11�1 iovoz� . I � . . .� .. ..­K#�Or�00 //`1 // I , � e I � I r'jv;_',�j " T�o � / . . : I . .. . _ 0; / SS Al /I . I . .� �*# ; . .. . .... . . , '! x . " . . . .� �0 / RIPRAP OUTLET PROTECTION -J / , ,_// I // Wl=4.5'; W2=13.5'; L=9'; D=1.4' / " -A i , / I . IK 41 I � / / / .. I—— _�. .. / ROPOSED SILT FENCE / I ,�� I ....' I �%� r I / /,�,, / , . I . � ,:;�.. - / 1+1 % j / ... . .. zw­ / ,e _". I � / I / I ,�1* + / I ��: �Ll -,� / I /le I- - I \1 f, /- , _� , /. _L/ �# Z. / / X/ / / - *" / ") i Z / _1 I I , -1 '. I / " I � // 11 " / / ) I / / / z / / /111 , _I'/ j 1, I "I * __­Z_� / / TONE OUTFALL ; 0 SE'DIME'NT BASIN S.DD - 3 _ I ,.,, 1',// // I/ , /I I NTO BASIN I I .1,10 .1 -­__ - 11 ... I/ " / 6'Wx5'Lx2'D (TYP.) SCALE: I =40 _, -1 - I If i /I I/ / * I I / 11 11 i i I � i n \ ____�___ I � t �N I . i � . I . . I i i � 11 I I � I . I � : I x , ,\ , � . I i ; 11 I �\\, , . " , � , , 1� . c c / I I i I VVII 11. \ . , 1� � ­ __ ! ! I �,' PROPOSED 20' EARTHEN I \ ,� . * \ , , \ ,� \,\\ " \ - i f I I 1# I \ , \1 " , ", , , \ , \ ., , \ �721 i i t f I - MERGENCY SPILLWAY I '-\ "\ ,,, , , I 1\ \ I,, \ I i I C I � .. .. i zz ' 0 , \ , " , " I I \ \ '__ . 111_1� � ELEV.=548.17 , ' - 1`1 � I . . . . I . ' � LOT �� IS F �\ \�,\ I \ 1\ . ,\, \ \ , . 1. .-.-- 1 I _____� i I I � '201, I, , , \ , 11\ � \ , I I i I I i � � . \ , I . �.. .. . ... .t I / I __S� t I I \ i \ \ ,�, \ 1, -��-\ . . .. ; f, ,fX� ! . � I . I 111. ,,, < i \1 , 1, � � .. . I � . . i i i I , " \ \ I \ \ "", 'II .. ? 1 I ) >.,< I � � � \1 -1 . � . / 11 I . , ; , \ \ \ . , I �q �,___� I I I I � 1 . " \ , / I - \ \ 11 \ , , \ � \ \ --...:-----: - - -� -11 4" CL. III kCP RISER . I . � 10 ., ,� ODE. PAFFLE­', I '� . . I "I I/ 11 , 1, I � .. .. . . �--L_, ­', , RIM=547.17 _��-\ "I , \ \ , \ � ��­�- '' . . ,._­� I / i,f I / I I\ 11, � I - . I . I � - -;--- . 1� , I . .. I ** I f , \1 '� 1. \ ,\ � [\" 1, 1, '. \1 \11 '. ,\ : I . . 1� I " ! A ! \ . I �� _____� � � 11 I I . 1, . / / i I I'll , [, \ I 1, \ .1 / I / ! % � J\ "'-\ \ 1� \ -f... ; I � I � I . \ ­­`� _�00�7 11 � , , : I \ \ " A \ \ -, .. 111. ,, ". - - ! ____1 I \ . i I I - I / � i . ""' � , -F - 3 F \ Y'FENCE\ , � \ �\ � : � .1 � " ��.",.": I ­ I PROPOSE //f 8" CL. III RCP BARREL . A ET - AF/ . , "'�/ I , 11 . ) ,INSTALL SIGNS "WARNING: ' ' \ .. I 11 =110'; S=0.5% . -_ I ,� � - V � .. ' k . "I * '_" � . / I QUIICK SAND, KEEP OUT'� \ \\'', I . 1/1 j I. 11:=540.00 1 /_--� , � , , I I , il, I ,I I \ I t INV OUT=539.45 � , / % \ / � i r ! / . r I ,,, � -*11 � I / � / �t 1 2007 , 1 3 \ � .1 � , _14- -- ro i ' ,, I , 2,,SF­`� . I ��../ / / / I , I � , � 1! 1� 11 � I . � 11 . ) \ � . , , , Ivx /11 I 11 .11 I i I I ­ I ,.,.. I/ ,/ ,,, ; 1�f � __�___� . � � � I . � i � -1 � � ,,, ,_.1 ,,"� ��,, I/ / ,/ ! I " I I % 't 1, , */ '� � � " 1��, . � . I , ; Z,. I ­ I � , 11 ­ , / , 1 i , , � ... - N -, I - "j � 1 1 ,- , , � I � %` _� � I I I � ? , ,5 , ., �� / -'PROPOSED 24" DIVERSION'S-,-' � � ,; I/ 1� I ;_," . 1, I %� I 11 . . � , I P - , /I I � / �, I � t ­.­'. I / , X,�, I , ,. , 'I,' // " � , � 1 \ * � S I � / r,�,N,`: ,,_---- .1 I- ��,� _* 1. 1 I # , � I , - ., " - -, / ,# .­ __ I- I -,- I ,,,,..­�,,,�,,,�.* / I / � I IPRAP OUTLET PROTECTION ­", / -;' _:� � ­� _1-1' J " / 'x .�,._R��- � � - � / - ,;,. , , . , � ., -�` , �:, , ,,�,�:,­, ", / / / W1 = 4.5% W2=13.5'; L=15'; D=2.5' 1 ,� , "" . 'I ___ - It 1. i i � , / * I/ � , ! I / I - _**# / I _1/ / i I 11 / It - (?f .1111 ... Sediment Basin #1 Design � 1. : design high meter (ft) � 563.00 546.18 11 I ... I 1354.1 . : . I'll .1 10.0 MR4. I'WI.:MI.LWAY CREST Of EMEROMf Z MTHOUT SPUWAY drainage area (acres) 545.00 1: � I I , 20.21 1 .1 1.49 I 1 � e, a. fft face I_ )��. 1sI 1ib_I', ll�. 12.I1A1. - 1 )DESIGN H160 WATER .. .1I, downstream face slope- basinI volumes. (using 2contIoIur intervals) 113,541 �. 1 . baffles: 425-�FI, S109ELEV.) I . elevation (ft) contour area (sf) - volurne:(cy) 11 I I I I . a, v I Il r I . - - 64&00 9869.0 �0 .. WA I . � . � , I . � 1. 54&00 I � � I I , , . 1084.mo I 383.2 I 114�%,.,,%�.1,111.., __ ....- � - , �, " "I I - - ­­,��,­�:i�'� � . _­ .. � � I I I" - .1 �,��, 1,�., . RISER CREST. . I � 548,00 128351-0 1258.8 � ,.., �, Im . STORAGE ...... -1_ I , - �.� 'i ­l " . . 111.1- I—— 1-11-11 , � . . . � �:,!� - ,,,, %-�a,- 5N . DMATE Wj 1. DEVICE 11 1. 11 - 550,019 .1 , .1 11 15480.0 . I 2306,0 � , ... , -WET - .......... ­­­ " _IM' 1_ 11-W.", -1---1..1.'_ . ....... - .... - I I 38,76 1 `111 ... 552-00 I I . 17708,0 I . 3534,2 I � I 1 ­ - 61)6 ! j � i : � i � i j i i ! � - I 20037.I I 4931�3 I I - 1 . - 5I43.0 0 I I554.00 , _ SLOHt5-AF­ELEV-5250--j-__ I.I1I 539.82 I SWMEW1 C"Ov. (" WET , 5MRAOX., CED 544.00. I � I s 45&0 . 1. to � I ,p width ofdam. (ft) 11 TO 3 C I available volume before cleanout (cy) (rnin.34*DA) 1 i .1 I I I I 11 , . MktA0_raeE; , -wet storage required (cy)' (67`13A) , � - , 1. . . 11 � dew 'g orifi I ft . Morin , orifice - I .1 . I 1-1 1. . � I I I . . . I . . wet storage:proWedat: this:. elevation (cy) . II I ,.11 � �11 �I available . I 1.:v­dIu­neIb_etoIrIe.clo,an-ou..t1 .(cy)�in, 34*. ) I cleanout elevation � M distance from clean�oIU ttIo.orifice 11 (ft) (>A. I) I dot §LorAQe-., I dIry storage requir-ed(cy) (0 7*DIA. ) I I I Iprinciple spillway crest .ff� .� t.. ) dry storage pro\4ded� atthi1s1 I -. leIv I aton (cy) � - diameter ofdewaWing. orifice (in): diameter, offleAble tubing (in) (otifice+2") , . � .. 19 � I i`L noff -, . I C.(use 0.45 for bareearth) I 1c(min) I I I I I 2yr 13.7 Q.2yr I � I I 26yr: 5,4 Q 25yr , principle ­ � ­ ­ 1. � � . . available head (ft) diameter riser (in).: . . - spillway capacity, Op (cfs) I I diameter trash rack (in) � � I barrel length (ft) I � � I - I I head. -on barrel through embankrmnt, (ft) - I � I + I diarh0WofWr,6l.(In),.. _-11 .. 1354.1 � 1. : design high meter (ft) � 563.00 546.18 11 1 1 1 1 .to. I I 11 11 P. of (ft) I I 1 554,00 1 11 1354.1 . : �.., 1. .11 1 I top of dam (ft) I'll .1 10.0 68711, 1. 1�1 , . 1 bottom of.bo6in.ft � I 545.00 1: � I 540.169 .: 1. 1. 1. � approx bottorridimenstions: 1. Wx-2W 1.49 I 1 � e, a. fft face I_ )��. 1sI 1ib_I', ll�. 12.I1A1. - ­ 24 .. .1I, downstream face slope- , � I 3:1 113,541 �. 1 . baffles: 1 1. YES 551.33 1 length of flow, L (ft) 148 1749;0 .1 I ., . � .effe.0ve widb, We (ft) I 15 . 8.0 I � I I L i We � (baffles not required if >2)��. � � :1.28 10.0 . � 11.11 � I I 1'199:7 collars:, I YES + � I depth Of water I �A $001may 0 � ri . ost (ft) 11 ­ - I ; . - 16,33, . 1 ,0.47 � I I shape of upstream face: (Z-1) 21 152 � slope of � barrel (Ski) I I . - I 0�50% � 11: � 11 . 35:1 . � �: length of � barrel. in. . saturated, zone (Ls) I I 38,76 56,4 11. � . I � �. . . .number collars required . . I 60 13 ,wIet�I � � dimension of collars ­ - 61)6 1.67 emrgenc y.sI p­i.lm.aIy., YES 24 I � I required apadity (Q25-Qp.) (cfs) 37.4 19.00 1 Ie. I 1 1 I b11I ot� tom width(ft) 2 6� 3 I .. s1 of exist channel ./ft) 1 330% 24 II minimumlength of exit channelfft) I I I 52 I 11 . 11 . .55 . I ,.' crest of spillway (ft) 552,33: ­ 24 � �(usi�n,gI elevation ft contour ur area(4) - ­ -1- . Sediment Sarin #2 Design ; I i I I . � I 24" RCP .111 RISER I � � drainage, (acr -� 1.33 I I I � 14.2 8 � wwrINI, $TUL I WAY � rVATHOUT: I I I CREST OF &MF_Rr4VCY SPILLWAY . . I drai,nage,area,(acres) I 560 I I . 611,21, I DESIGN HIGH WATER I basin volumes: ZbIoIntour.intervIalIs)I � . � 16 GA. GA�V. . I I STEEL ANTI, ,(215I -,ypI I I I- 1.�I 1 1 STOI1-R i ; � . � �(usi�n,gI elevation ft contour ur area(4) volume (cy) 1, I � I I I 05, I -_---______�_ -------- -------------- Iii Ii . i� 538.00 57%0 0 1I .0f-. --S.D--r I ___ _ _mo_ 540.00 81270 512A 1 RISER CREST . 54240 1048&0 I 1'199:7 - WY - =RAGE ., 1 I . ­­ A 544.00 I 13001.0 � 2068�0 � ­­ ", "I I -A1,1111111111-1, -1 �. -, -weT* sxoWE� , � �,,��,))'11 � "W �111.1 11 11- I—- , I I I 548.00 I 10484, 1 0 . I � 11 . I 2204.1 , 1W SMMEW,CU Oil (* WET , SIMFE RPEODUM. I 550.00 �. 12195.0 11 3043.2 TO 34, CN,/ "E) I ,wIet�I (7SPILLWAY W7 ; T �11 I i . 1'� I (PWIME09 . CEO ET TO ;M C�Y.'/ ACRE), I ! j � i : � i � i j i i ! ,a,orIne,I. wet storage rA) .e uI r,edI (cy)I) (6,7.'i*"D AT ELEV. 5521.33' I 4-16I Idesign highI water -(ft) 5I43.0 0 I dewatering orifice elevation (ft) _ SLOHt5-AF­ELEV-5250--j-__ I.I1I 539.82 I top. of darn (ft) 544.00. met storagia,provided at this elevation (cy) � I I � I s 45&0 . 1. to � I ,p width ofdam. (ft) 11 �10;0v I available volume before cleanout (cy) (rnin.34*DA) 1 i . 211.11 I bottom of basin (ft) 538.00 1 cleanout�elevation (ft) 1 1 485.5 I 1. 538i82 1 1 � 1 . I - I a � Pprox bottom dimensio , ns� 1 . .1 .1 12'x266, I I . I . � � I . distance istance f I rom cl,eanou I t to orifice (ft) (> 1') . 54237 .1.00 � upstream:face slope: 12:11 � II ! I55»,3.00'-1 1.88 I I I 1. I _ I., upstream fad� eslo � pe . : downstrearn face slope'. 31 �dstorage r I � i i i ! . � � 1 I I I . .311.1. dry Stora e: . dry storage. required (cy) (67*DA) . 4161 baffles', NO � 1. .1 , rind spillway crest (ft) prunc: I - . � � 956.8 ..5. I 16.�.8 . 54,1;50 .. I length of flow,� L (ft) . I I 1. 23G � dry storage provided at this elevation (cy) I 64717 551.9 � effective width, We (ft) 1 . 34:44 diameter of deWate ing orifice (in) 9568 I I 5.0 - . L I We (baffle not required if 2) I . I I I - . I 6.a5* diameter � diameter of flexible tubing (in) (or � ifice+2") I TO 7,0, 0.29 I diameter of fle)dble tubing (in) (orifice+Z') I 90 i collars, YES � runoff:. 7"'DIA. ..collars: depth of water at spillway crest (ft) ,350, C (use 0:45 for bare earth), 1 i DEVICE-'TU1BIN( I � I 1 I AT ELEV. 548.113 0.43 1 . . slope of upstream face (Z-1) -I � �2:1 tc (mini) I 1 I 0.47 96 � 11 . I slope � ,barrel (Sb). barrel .1 � 11 I O. .. I , I 2yr 41 Q 2yr I 10.9 I length of barrel in saturated zone (Ls) � 11 21.43 1 25yr 6.0 , � . . � ,Q 24r - 17�6 . � . I.. I I number collars required .1 - 2 .. I I . � Q 25yr I 35A I number collars required , dimension .of� collars 5.646 � . � . - ncigle 1. §gilb6@y: pli � I 1 � I I 1 -----I-,--- �, � I � 1 . . I pdno*vuhft: . r , I � available head (ft) 11.00 . cy spil - May., eTg-rqe-n YES I I diameter :r1i1g. riser (in) . 1,83 24 I I ­ � required capacity ty:(V574) I(cfs) 2I -I 6 spilkNey capacity, Qp (cls) � 24 15,00 bottom width (ft) :10 � � diameter trash rack .1 I 19:00 � 136 slope of exist channel (ft1ft) I I I 33% I 1 barrel length 00 . 36 � I 115.0 � I . I I � minimum I nlength.of it channel (ft} . e)(I ,) I 132 � � I . I head: on , barrel through' ernbankrnent,(ft) � � 110 ,5.26 . crest of spillway (ft): 1 542.50, diameterof. barrel (in) , .. 1 18 . .. I -1 I I . I Sediment I � - ­ � ,iment Basin #3Design I � ; I i I ; � . � I 24" RCP .111 RISER I � � drainage, (acr -� 1.33 I I I � 14.2 8 MIN -1, w Solawn : V mtkout i CRE57 Of- EWERGENV SPILLWAY / area I es, I � 560 I I I i C I : I � I � ; I I DESIGN HIGH WATER . � I i I I ; � � ; I : � : i � i I � basin volurnes� (using 2" contour intervals) � � . � 16 GA. GA�V. . I I STEEL ANTI, I - -(25-YR STORM ELM) I . I i ; � . � .(ft) contour area (sf elevationA I I - me volu(cy) . I I �0.51 I -_---______�_ -------- -------------- Iii Ii . i� . 540.00 I 4707.0 0 � I MK 1.01 ---- �. I - -- - ----- 54ZOO 5968,0 394.4 -111- ­­­ ��� ;�, �� " � �­'...111 RISM CREST 544.00 .1 7365.0 � 88,74 � MY I STOWE . I VENATEMNO MACE 546100 8874.0 :1487.9 I I * WET ':MR , AGE I 548.00 I 10484, 1 0 . I � 11 . I 2204.1 � I 550.00 �. 12195.0 11 3043.2 . . 5 CLEANOV FIDIN, - I I I I (7SPILLWAY W7 ; T �11 I i . 1'� I (PWIME09 . CEO ET TO ;M C�Y.'/ ACRE), I ! j � i : � i � i j i i ! wet "t tage- , AT ELEV. 5521.33' I � . i I I � I I T i I i I I met store . I ge required (cy) 67 DA " _ SLOHt5-AF­ELEV-5250--j-__ 956.8 I desi n high water (ft) 1 � I I I I 549.00 - .�.. � . � I I I demb - If- I elevation (ft) �.. � - � I s . 1. 1544.25 . . topr of dam (ft), 550.00 � I I wet storage provided at this elevatioin (cy) . I 1 i 956.8 top� width. of dam (ft) 106 I � available volume before clean ut (c�y), (mini, 3 *DA) 485.5 I 1. bottom of basin (ft) - ­ 11 �.. I I . 540.00 11.� . 1. � �. cleanout elevation (ft) . . i ____ � ____ � i � ! . 54237 I app bottom di mensipris- I . " I I 11 97'xl 16 I distance from cleanout to, orifice (ft)) (> 1 I) �'. � � II ! I55»,3.00'-1 1.88 I I I 1. I _ I., upstream fad� eslo � pe . : �2:11 I ., � � I � I � I I � i i i ! . � � 1 downstream face sol Ipe: I . .311.1. dry Stora e: 550 . - __1 RISER t1OR ELqV1 - - - - 1`7 1 i - - --- -i- - ,- I _+____ I , --7- -T.67 _ = &§�_3:K_____j - � - - � - - I I I I - i - 0-- DIA. 'I equired (I (07� *I DA)I . dIr-y storage requiredcy) HEIGHT 1 ; I � � � 956.8 ..5. I 16.�.8 . . ft1 _ s. �- ­ YES principle spillway crest (ft) 1 550 64717 I length of flow, L (ft) , 6.3 I . � dry storage provided. at .this elevation (cy) � I � 19 .. � I I 11 , � 1 1 I __ _.. ----1-------�-- - 9568 I I effectivewidth, We . I I I I , � � 217.54 I .11 , I I I 1. diameter of de.watering orifice (in). 1 I I . I -_ I TO L [We (baffles not required if �> 2) � 0.29 I diameter of fle)dble tubing (in) (orifice+Z') I I 1 90 i I 7 � � I 7"'DIA. ..collars: YES I runoff: 1 I i i I ; i DEVICE-'TU1BIN( I � I 1 I AT ELEV. 548.113 depth of water at spillway crest (ft) , I 7:17 1. � �. . . . I I. C,(use 0,45 for bare earth) THE EXISTING FOR SOIL I 0.47 � � . I . � 1 I . � ­ slope of upstream face (Z11) I I 2:1 1 (min)' ___ � SHEET � .1 1.6.9 slope of barrel (Sb) 11 � . . 0. 50% I 2y,r 3.2 � . Q 2yr : . .1 �21.5 length. of barrel ,in saturated.zone (Ls) � . " ,. ­ saturated � ,� 1 1. I 43.9 ,. 11 � , �i ,.25yr4Z . � Q 25yr I 35A I number collars required , I .2 1- --------- � ...... _. � ----- � ------------ � � ,-.-.._ -_ I I I �_-­__ --------------------------------�., 1 1111. -�--�-�.,,,--- "------,,,,� _ __ i � -_ ! �i � - � __________i__ - I � I 1 � I I 1 -----I-,--- �, � dirr*nsion of collars 5ZIX5.6 1 . . I pdno*vuhft: 1 545 j I � 1 RISER � . available head (ft) I i 14' 281 . 1,83 . ems 's Iwa ,, VL_�L YES I I diameter riser (in) , (iii) I 539.8 � 24 � I I required capacity (025-Qp) (cfs) required , 16.4 1 spillway ty, OI p (ofs)I capIaIcI .1 I 19:00 � I � bottom width (ft) 20 - diameter trah.:rack (in) i I ! I � -_ I --- � ------ - - ---- - 36 slope of e>dst channel (Rift) � 33% Ii barrel length (ft) � 110 minimum length of exitchannel (ft). � 44 head on I barrel through embankment (ft) i � �� . .8.72 crest of spillway (ft) 548.17 diameter --o-_fba_rrel (in)I i I . . ELEV. i I I I 18 i i - I -----------] 10+00 SCALE: V:1 "=5' H:1 "=50' 10+50 11+00 11+50 12+00 12+50 13+00 ESC BASIN i. 13+50 14+00 14+50 15+00 15+25 -.I----- ; I i I ; � . � I 24" RCP .111 RISER � AT ELEV. 55 11 1.33 I I I I i f � � I I : � I 560 I I I i C I : I � I � ; I I i I f � � I i I I ; � � ; I : � : i � i I I I . i . r I � W/36" DIA. 13" H) ; i . i i HIGH � . � 16 GA. GA�V. . I I STEEL ANTI, � 4 VORTE I" �X DEVICE i ; � . � _W136" DIA. 13'HIGH 16 GA. G � � � ! 5 0 . i II I -_---______�_ -------- -------------- Iii Ii . i� I -------I i ----- - ------ I � I I i i � h ; I I I -1 __. ­ ------ e U I ; !I : i g � -D-FA -13E_FI EL ! � I -E-D----+----- , BRICAT i t � � I I � � I i f ; � I I . -_ I ; TRASH RACK MAY BE FIELD . I � I I . t I ; i ! � i i i T ; i i � ; . � i � r -TOP OF DAM � ; � I � WIDTH--':IO'AT ; I � LE V� 5,54.00' I I 1 1 i I i i � ! I I . I . � I TOP OF DA A WIDTH=1 O'AT - ELEV.: 554.00' I . . I I I , I� -,-,T"----,---- I o I I I � . I I i ; i ; i I I I i __1 __­� �­­­ ;----- I ; I I i ! . I I � . � I I I ! � ..... . .--- _________,i_______ � _____ H4_____A i i 62'EARTHEN ; I I I � RGENCYISPILLI I I � 5 I A____--1_1__ h AY VVI I�H ! __________­____________ - � � 2:1 'I � I i _______--------- I i T I � � I z I I I I (7SPILLWAY W7 ; T �11 I i . 1'� I I : ! t i ; A ! j � i : � i � i j i i ! i � I SIDE !SLOPES i AT ELEV. 5521.33' I � . i I I � I I T i I i i _ SLOHt5-AF­ELEV-5250--j-__ 555 I 1 � --, I i i I I I ! ; s I i : i � I s � z I . � I � � I i I � I . . I I 1 1 i 555 ED INTO THE EXISTING - ------- I ! d "I -i I I i 1-11 1 I __ � � ---�_------f-­ . C � � I _ -----,---- -, ------- � : I ; I I � I : ; i 11 � - ; t I � --- ; i I ; 3 ; i i i L_ _____­_________� I I h � ; � ______ - � --�- ­­­�- ! ; I I � � i I i ____ � ____ � i � ! ____ i -_ � I i I � i I i , � z i i GROUIN D WITH 1 I SCARFI f- I ; ED KEY FOR. � II ! I55»,3.00'-1 � � R ELEV. O�� t � i = , 1'MIN.1 . I ; - � 1 .1 , . I , 1 I 5.8'MAX MAXI I � I I � i i i ! . � � 1 I ; I i I 1 1 ------- . , _F � f . - i 1,WMIPt. E I . - - MAX - . . 2.7' '! . I 550 _Z�-YE�"T , - I I I � - - 1 \ - __1 RISER t1OR ELqV1 - - - - 1`7 1 i - - --- -i- - ,- I _+____ I , --7- -T.67 _ = &§�_3:K_____j - � - - � - - I I I I - i - 0-- DIA. 'I I - - -Z . . I � - 1 = 1 1�� i I i HEIGHT 1 ; I � � ! ! - ---1 � 1 I . i I 1 . � i ; I I ; � N i I I i I i i I ! i I I i j . 1 550 . 1 . -_ I _______+__----�-­'- - - � - I)EWATERIUG- 1 1 I __ _.. ----1-------�-- - I ; . � ----,,' ------- i ----------F------- I -_ -----�- -_ i S TOR SEWER I V_�) i I I 1 - - - i I 7 I ; ! � I 7"'DIA. I I OUTFALL RIP I .. AND i I � ; _> �_P$ EEA 1 I i i I ; i DEVICE-'TU1BIN( I � I 1 I AT ELEV. 548.113 I ! ,- I I 1-_ I - � - I �_-,,._ k ­ - 1 - I i CLAY CORE i I � iINQ. I i DAM KEYED INTO � � . H 1' RIFIE"EY THE EXISTING FOR SOIL � I ' � ' i : - I GRADING ___ � SHEET � __ __j____ I I __ ----�-------------4--________ I I � LEANOUT . i I ,n.-_---. __T_ ­­.. -_ . - I- . ......... - -_ . i __ __0 . COHESION AND I _S(�A � 6" TOPSOIL � MIN, I � I ! --_Ill ""u _0 I 545 I I 1 ---___ --k ______ i i I I i i ftEV.5 6.69 � i 4 � I � I I I ! 1- --------- � ...... _. � ----- � ------------ � � ,-.-.._ -_ I I I �_-­__ --------------------------------�., 1 1111. -�--�-�.,,,--- "------,,,,� _ __ i � -_ ! �i � - � __________i__ - I � I 1 � I I 1 -----I-,--- �, � i i I i , k I i � � i 1 545 j I � 1 RISER Mill N. 3001 ; I 1 ; I i 14' 281 i i ­_ I i I 539.8 i . I r 1 i I ; I 1BOTT � 1L__________,_�_______---L -BA,' I 111OF . -------.----,----...--qK,�_qGREG��7-- ! i i I COMPACITED S OIL I , ; I I - I t � 4__ - -4 --- ------ _�__ ____ I ----------! . � 1 _,111111 t- ____ 1 � . i __ __ _�_ iii Ill iii iii I __ __­ -------- --- i I . t ­_ i I ! I � -_ I --- � ------ - - ---- - I ­_� I i - I t ___ � ­_____------_-_____,______­ - I I � � � i OVER BASE PLAT I i I I I I i � i � �� � I I . t I I � j I ' J I i I . . ELEV. i I I I 545.00 I k i i I 11f, =====k=1111iii1: ii I I o I I ! I 540 I I ; I I li I � 1 -IF---- I i � ; � . i 8'X8,4" THICK GALS/. 1 -------- __ , , � ! I � I 1 � I I � -_ � __r________ZS1 � 24" RO P I I I_j I ______ � � I i i i i I ____ _­­ ! i 1 i 540 . . - . . i . __--A;O0TING � I i ; TE 8E , . 9 .EL 9k I i ; i � � I F I � i I i ' / i BARREL L � TT� a 7M- I I i I I I c i i I I I . I . I j f � i I � OR CONCRETE � I i GALV. STEEL I , (3) 6�X6' GAL ­ I ! L=244'; S=0,59% i . . EX. 15" VCP I � I VDOT � i STD, 1 I 538 1 1 , i i i i i I i P COLLARS 1 ANTI -SEEP INV IN 542.00, SAN SEWER I I i -7 1 ; I � EC -1 CL. Al i 538 co - in In I INV IN. 538.00 INV OUT. 540.78 RIPRAP W/ O� 0) . r__ co CN 0 (O C:) (O U� GEOFABRIC 'It U') 't 0 I-- c6 , LO LO ,6 N "t LO ,6 6 It 't (y) 14" UNDERLAYMENT U ,0 LO U') 0 0 LO U) L=13% Wl=6'; I IV2=19'; 10+00 SCALE: V:1 "=5' H:1 "=50' 10+50 11+00 11+50 12+00 12+50 13+00 ESC BASIN i. 13+50 14+00 14+50 15+00 15+25 -.I----- I i I I I I I " TR - I VV" FT)POFPAMWI 1 24 I i � " RCP 1111 RI �ER AVELEV. 541.50 I � . z FAB RICATE (.550.0o655 D I 1 i O i ­l 1-1 0� I 'O' SIDE _W136" DIA. 13'HIGH 16 GA. G 'ALV. STEEL ANTI -VORTEX DE 550 . 4 . . . . . . . I . . --- . . � � : 1 ; I I . . I . ; I I � . � I ; TRASH RACK MAY BE FIELD . r FABRICATED FABRIC `­`> 550 IT CY) - - I I I I . I I I . . i--- I I . I . � I TOP OF DA A WIDTH=1 O'AT - ELEV.: 554.00' ---- --- ---- -CLAY- ORED -aAM-KEYED-* :5 CL T -0 -THE EXIST 550 z 1 EARTHN EMER.. GENC I.II. 0'E.. (7SPILLWAY W7 H 2:1 1 1 I i . -------- �------- ..I i\ -------,-----------�-.------ E ------,------_____ ____-----�­__ _ SLOHt5-AF­ELEV-5250--j-__ ­7___ _ STQR �:�� EV. I I \ 1 � =� 549.60- 11 M __ - i i . 1 \ I g � � . t . � � ! I 4 . t � : � . . CLAY CORED DAM KEY . . ED INTO THE EXISTING - OU I rtjLL� RIPRA - 545 - 1 . i A ; i I I __ . ­ � __ r � � . . . i � t � z i i GROUIN D WITH 1 I SCARFI f- I ; ED KEY FOR. SO IL � 545 STORM SEWER - -------- * 1i I i . I i 25-Y - . AR STORM EL - -_ i I EV. = 543.00 ------- . , _F � f . - i 1,WMIPt. E I . - - MAX - . . 2.7' '! . I I I . i i kX I OUTFALL....- � �__­­ I _____ . - ­_ 7z- 1 I �� I -EMBANKMENT . 1 . HEIGHT RIPRAFY-SEE--- i z 0 f1 I - ; ­_______, ; I � . , ' RISE R TOP EL � V. = 551,50'- k __,_.__­-­---­ i 1.50i I z ­ ________ ! : . ! �/_ z HEIGHT i -_ I i I �, ���i GRADI�G SH ET - - - - i -- i ! I . I I f 7"'DIA. -, - I - C I I i - ---- . I - -�_ . . I I I z CLEANO,UT--' 540 � < t i i c I � � 2 . ; : - t -!i�iii�il�..-..��-------------�.'..,, . . _ ------ - - . I . � i �� __ . . . f I j i C i - 1 540 () I - LEV. 54237 I i i ____ . --_Ill ""u _0 I i I . Y . I I . ! I I I i 5 DEVICE -T I c JBING ' i . I �_ 1 RISER -/7 i I I . . I I . I AT ELEV. 539.8 I . I � i -_ � I . I r i I ------ 1-1 _­___________ ___-1____. ! ----------__ ------- 4 .71' . I- - , ! --- I -_ i - - I t ___ � ­_____------_-_____,______­ - I I . I . ------ �--�.,----,-----�---�-,,-,----,..- i I I t __­CLEANOt I Wz (2) A14TI-SEEP . I I . E . BOTTOM' 7- ; o - I . t I I . ELEV. 538.82 . I ' J I I I i ! I t c W �. 535 L_ z 0 .0 � I I E , I - . OF BA I I . � � t I 3 ; . x . . I . I I ; I . � , . � I I j . I RISE R � t I � I I . I I . � i . ; DOT STD. 535 I i - I E_LEV. 5_3&_00 1__ I I I . . - . . i . __--A;O0TING . i . z 18" RqP 111-/ I I =C_ - 1 CL. Al - W � I c i I . I I . I I . I . I j 1 . . .- IBARR �5.5'x5.; (2)�G I. , V STEEL -j "' , T I � RIPRAP W/ 1 I 532 . . . I I ; i . I ; 1 1 I ; i I i : � . ANTI -SEE � COLLARS I I S=0.50% i -EOFABRIC I I1q 532 m : INV OUT. 539.45 co - in In I INV IN. 538.00 JNDERLAYMENT (.0 "It U') 0.2 X - 0 Q) O� 0) . C) 0 0 . C) 0") CD . V_ INV OUT. 537.25 0 T7 -=9'; W`1=4�5'; W2=13.5; D=1.4' 'It U') 't 0 co -4- LO co 't U') ,.;I- M UD _j F_ 0 U) - U LO I to LO I -W 0 W SCALE: V:1 "=5' N:1 "=50' 10+00 10+50 11+00 11+50 12+00 12+50 ESC BASIN 13+00 13+50 14+00 14+50 14+75 24" RCP Ill RIISER AT ELEV. 547.17 555 I I -------- 1 i I � � I � j . I -11-1 i I i ____ 1 " TR - I VV" FT)POFPAMWI 5"L)1A.fI3"H kSH RACK '(3 MAY _116(3A.(3ALV,bIE1:LANII- ; BE FIELD ; TH=10iATELE FAB RICATE (.550.0o655 D I 1 i O i ­l 1-1 0� � i I I 'O' SIDE EAR THIEN SLOPES EMERGE Ar � ELEV. 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SEDIMENT BASIN SB -4 11� / /� � / / 1- I/ / /l/ � / ��,:,_ / ,/ /I /I , / I , >­­­ - I /I -";i7- . / 1;i ­ ./ " I "I I I , " V I , '',� 11�1 / I / /./', , " � .,� I I / - I ,",/ , I ., , -, I I - � -1 - 1, _/ - - � - 1� 114 �' � , - � � -1 . . -.1 / , . / /,. "�",5 ,. - , , /,- __11-1. - __'�. ,��,,� ,/ , / , / "/1 // , / �/" // / � , 'oe,-,-' / " I , -, Z,� I , I . 00 __. __ , , / , ,� .- 11 � _ � , , � /, . _­ � � I / , /,/, , 11 � / ; ­ _­ - Z/ ", // / / ,/ // /, I !�-,� / ,,� " ,/, ", 1�__, � 11 ,� 11 ". . 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I \ , \ , �' 11 , I i I \ : � STONE OUTFALL / I "', \ , \ \ \ '' \ \ \ \ , , , ALL INTO I I 11 j I / / 00 _�. _­ ---__,_ ­­_ ". . \11. \ 11, I \ , , , I 1 1 00 11. --- I � , i . ' ' l .� \ \ � � I 11 I \ , , , 00 , \ I I i , ; , , I i \, I I \ \ . I 6'Wx5'Lx2'D (TYP. I � I � I i , \ \ \ ,� � i 1� I i � I / I / I . \ \ \ " 11 , ,\ I I _/ f I i , I , \ , � " I f � I � \ \ 11 i I I I I i I \ � �� " . , ! I I ,\ I i I ~ x \I \ ., , 1, 1. ','� I 1 I � N \ , , ,\ '� I ,\ \ ___� I / / -------- _­­ , , , ". ! : t : f. . / f ; __ , ., \ \ ,� \ , \ ,� " � . i , 00 I . I ! I , � I `\. I'll I 11, \ , � � \ \" _1 , ! \ I * � i ; i " so / l , ; ♦. - Wow, � I ." \ \ \ I I _VDOT STD. E ' CIL 11�00 I I I I � I � I , \ 11 " \ , \ - _____ ____ C 1 . 1 RIPRAP p' � WO t I . . I \ \ . i 40 � / I/ I \ \, N \ I , \ I 1, \ - I .\�,­ FABRIC UNDERLAYMEN 11 1 l I / 'IN " \ � " \ \ , -- � (L=9.9'; W=13 �'; D=2.5') � " �, I / . 11 �I ; TS I \ , 1-1 \ __ � i )I . I 11 � \ \ I� I I 11 � ".! I I ) \. /I ! ; i ,_�,, \ I . ; I i I � -, ) i k . I __ \ � \ ! /I , N, . � � f � \ ��<� \ \ \ , \ 1, I i /\1 � I i z/ I f .I ) , \ \ \ i4 IN I I / I , 1\ N, \ / I lx, / ; I ; ; t i A � I ,_ , I \ to i I/ ) , t / \ ----- \ , , RAP,, - , \ , \ \ \ \ , ,5TONE OUTFALL I N 11 1 14 / SEDIMENT / \ � \ , N, ,\ \ ,, U T / , , / \ ,\ � \ , " 1� \�" \ \ \ , 6'Wx5'Lx2'D, (TYP. / M -`�. \ \ I / � 1, I ,O -i I , , / i / 1, I -_-, ,\ ",\ , \ \1 "N. \1 ''\\ \ . / / ",*,#' 11 I /,I (D' I , , TRAP I Do/ I 1\_,_�, � .\,. \ ,� N\ S ", \'\ \ ''_­ _// /.0-x // // I r_ / i / // PHASE I // \, \ � 71 / / � , .\ 'N' `. _'., " \ - , . � \\\�\ \\ \ �_ �! /\/ , I ; I '11'. I . � I , 1, / \ ,\ - ­ I , I / I I \1. �.. � ,\ ,\ , I \, ,\ ,\""\ 1\ \�, � - -, \/ / / f i I /I I I .11 I � 1\ I , \\\\\ , \1 '�, - / \ / , i I \ ­�',\ - �_� _� / / '' I I // / / 1.65 ACRES / ,\ \ I \ " �) 7� " _ ___/ / / .1 .,�% I . N, I \ "­ _�__ I \ I I . . , I \ \ , -- , I 1\ k I I \ \ -// . / 11 � / I � . \ \ � " \ � 1, 11 / � � / / .. \1 \, \ 11. \ \�� I,, 1�, I / / I , - ; I " I _, I f // I i - I I . 1. . k \ , \ � -, >< -- / I / / / / cw-0.30 1 \ __ /,� / , x I , / . I � . 1\ il � 1, I\ I ­�­' _____ ____ / / ,/ . . � . 11 , \ ,>- " I /I I / /I I I I \ - z / � " / 11 \ \ / 11 I -_ \ --,--- - , I � I . � -15.4 m* , " " 0. I-----"\,- " \ , ,_,_OP`OS 1\ ­_ / I \// Tc in. 1. \� >­_ \ "I __­ __< I-,", pl� ED SAFETY FENCE � 'I', I 1,,z / "I ___�_,_ "WARNING- 1� / I / 1, � _­ INSTALL SIGNS "WARNING I 11 ;i " , \ " / ­__ _>��_ � I , �, / , i \ -­­ 1\ \ QUICK SAND, KEEP OUT" . \/ "_ 1, / � I - , k, / / . � \ , I ---- I � . I � 'r \ i ,____ . , I � \\�, , �\, � , -- " -,-, N . � , "\ \ 11, I z I - I --- ___ , , 1� . _-.1- , ­ --- " "I ly, - k" . \ I 1. �, I ­ .-.-, - ­. 6 -- I 11, .1, - -_ �,-'\ ,-,---,-- ------. � " � - . '' ".- I - `��--- _'-­ - - ----- ,_,/ "I -, _ D ENSURE . - - , LIL_ ­_ � - _1 - �, I Sediment Basin #4 Design enc empjgy.spijhM- - � I � � drainage area :.(P;cr�Op) I ,24 , basin*wmes: (US119� 2I. '. C1.0I 1LOU,I rintervals) als)� � 1. ejevatiom'(ft) contourarea (0) .,�. 1 .. . 576.60 . 20730 . � I I—' . 157800 1. :269510 58000 :3.694 0 1 11 . $82100 - .. �. � 48MD . , � � 584.00 6024it11 1 5,Woo 1 1349.0 1 I I 11 MIN11w) M, LLWAY � I .11 CRM ZMTHQUT: V Z ILWOENCY .6-71. 1 1 1 1 Ill I I (�3GII � 1111G4 Wff)ll ­ . V S 0, 4w M . I . I I --- � ----- ­­_____ I - I,--,---- /------- I - 10 I I I 11 1-11-111 . 11 - I 4— * " ­ -F4MCREST 123.3 - .,STOWE vrw 358 672.8 NET. 54ORE \� 11-1`11- 1-1 � . I � � 107310 I . . . I I 1567 0 (S•mwq awntwo TO34 CIY,/ ACRE) � . . I wets enc empjgy.spijhM- - 11 I I - I drainage :area jacres.) I I ,24 wet storage �67*QA) I � � 1. , . 449,6 11 - I � design high water (ft)' 1. � �. . . I � I 585, QO I � . � 11 deWateri . . orifii�iOele bon (ft), jig � 580.58 � � � top dam (fit) to 41� I 58&00 . . .. 11 11 � . Wet.:Stora e PrM46�Z at this elevation (cy) ­ I 9 I., I . �. I . I .1 . 450.0 � I I too. width of dam (ft) I � . 1.0.0 .1 � I . I � � , awailable�volurrle bef&e cleanout (cy):..(r6t!.:34i�DA) I 2281 I bottom of basin (ft) � . � . .. I 576.60 I I 1 , *.. , (ft) 578.89 I II 1pprox bottom di 0nsions, .,,, I 1. 'cIeanot#,.61eVati9n 58 z* 1, �II distance from cleanout to orifice M (> 1t) - t89 , upstream face slope., I 2,11 I . I I � downstream. face�slope: : � �1;1 dry: storage: I I - I � _ . � , 1. I I ii dIr�y:§.tJ.olcI�IIgw. 1II w4..wmI icy} (67*D�IA, ) 449I,I 6I baffles: YES principle:spillway crest t) .d1 � 583 13 � . I length of flow, L.(ft) � 05 ,dry Storage PrWded: at this elevAtion (cy) I � I 4%,O . I . . . � .. .1 eftotive I width, We 82,35 . I . I 1. . I � . 'diAtT*t6r.,dfd.6�va!6,ring.orfice n ­ . I I . , orifice (i .) 4.0 1 . . L: I we (b pot requiredif:> 2) . � .1 . � I 0,79 .. 1, I , � , I . . � I , I diameter of fle)dble: tubing, (in) (orifice+2 .") � 6�0 I I �. � downstrearriJace slope: I , . I 11 slope; .1 % 271.4 I I I collars; YES . Luaft length of flow, L (ft), I � .. . I I depth:,ofwater e I t spilWay crest:,(ft) , 11 6.53 C (use.GAS for: bare earth) 1 ­ ­ 046 I , slope Of upstream f � ace � �z 1) 2*1 I t1_ ( 0). . ­­ 1z ' �6 I . ­ . I I. , slope of barrel:* , - , ) I � � 2,51% 1:4r: 3 �7 ClIr kyr 114 gin , let) of barrel in saturated zone (Ls) 1 39 98 I 1 1 . � I 25yr 64 Q 25yr 1 1 � � 18,3 nurit collars required ... er . ". 11 I 12 . 2:1, I � 20 . I I ­ dimension Of collars ..... : 6W I�rind ole. � �il� : ­ r I available head (ft) � djamieto riser (in) I . � . � , 5 RhNa Q I , 0 . ,y capacity, � p (cts/ I I dametertrosh rack (in) ­ . barrel length (ft . ) � I head on barrel through ern I bahkrnent (ft) M- - z I barrel - didUM. Of I j . , ,� 09) � , I I . I I Sediment Basin #5. Design. 11 I - I I I I I �. I - enc empjgy.spijhM- - 11 I I - I drainage :area jacres.) I I ,24 basin volumes: (using 2" contour intervals) 3, elevation (ft) contour area (sf) , I I I I I 693.20 967.9 600�00 11165,0 1 1 1 .1 602.00 1 � 1889.0 1:604.00: � .1 1 2729. 1 0 I � � 60�6.00 1 I . 368010 1 � 608.00 4732.0 - 609,00, I.. � , - . 4732,0 . . . wetstorage required.(cy) (67*DA) I dewatering ofifice.elevationff . t) I I I I I I wet storage provided. at elevation (Cy) . awilablee volume before:cfeanout (cy)#nin. 34*DA) . 1, . I I I cleanout elevation (ft) I dis1t1anceI ,froInI cleanout ou.t to:orifice(ft) (> V) I ­ � � . � � dry storage required (cy) I . . � , (ISMA) . I � principle spillWay. crest (1ft) , dry y $to .Pag.epIrovic,e �, ­ at this :Ielevation (cy) dian-titer ofdmdlering cxifcejin) I I diarrieter of fleAble tubihig(in),(orifice+2") I . I , I I runoff: I . C (use 0.451or bare earth) � I t,c (min) . n) I 2yr �3 0 Q 2yr I I I 1. 11 , 125yr 4.5 Q 25yr I principle spilbW I 11 i Ile Head (ft) � availab� diameter :rlser:(In) I I spilhwiy capacity, Qp (vt) I di . arneter trash rack (.in). . I I barrel length (ft) head on barrel through embankment (ft) diameter of barrel 011) 1.87 ­ ­ enc empjgy.spijhM- - YES ,24 1 I r I equired Capacity (Q25- ,) (offs) 3, . 15.,00 � 1 bottom *d . th (11) � 8 36, - $1000 of exist chandel (Rift) 33%. 60,I . 11 - . 11 � m11 nI1.im.urInlen*_ oIt­e1A1ft.1 channel n.e1l. ft )' 1,I -6 - , 8.48 crest of s1pilway �(ft) , I 584.13 1,24 � ­ � I I � I ------- __-_-___-1 --- - _________1_1___ ; 1, � I�,1z Sediment Trap I design:. 1-1 ­­� . ..... -111-1 ... ­­­l�­ . . I ­ 11 , I I ..� I �. 11 I 11 M44. 1*W1 SPILLWAY r WITHOVr MST OF EMMENCY 94LLWAY, 4105, , DESIGN HIGH N � i 1 / -I 1 eyl� I I � % ­ I 11 _.­ . . I I I � trap: wurnesil. I � I . 1-1 ­_ I - - ­� ­ I I I . I volurm I (cy) -11 I—', .11, j -s I .0 0 I % . I � - 6hevation � area (sf)J_.V0Iuft1*cYY M; I - ­ _­____ - ------ 1 1 WW 110, � � I I I � -_ .......e«.«.»,.I 6 343.6 I -1 MSER CRE ST 1 I .01 I 'R ' STORAGE ­­1_111-I .�, MAPNG142.7 512.8 � -1-111.--11.4.1--111 ;1111.11- ,,�,;,,��,,,,;-��,.�.,.��.���..'�ll",�l!'�;.,,,,"'I 11,V�-1111­ 1 wV I STORAGE .­­__­_­.1­_,_, ..-- � ­ . ,. V I V I ��* ;� I I ­­ 540.12 I � � � 860� * 0 I I I � 1. I I 1 03.5.2 E Our .. s&W CL mO e I M , ern ,1. - I � :-e TO 34 C.Y./ r) I mt 9."I10 8" 271.4 design high water (ft) 1 607,00 . 1603.51 I . I , I � I I 1 top 0 . f clam, (tt) 1 , I I 609.00 , 2722.0 1 I :top Width of dam (ft) mo bIottom of. basin �i, 0 59�9I 0.. , I13II71 .601 :91 , I approx, bottom dimensions- 1�. 22'47' teo 1 I � . ,- upstrealij tot;v pt' I 21 2:<1 I I �. � downstrearriJace slope: I , . I 11 slope; 11 271.4 I I .. � � I baffies, I I � I � YES � I 606.00 length of flow, L (ft), 1 n 275.0 1 � � 1 1 effe0w,width, We (ft) I I 96,84 4_Q, � I � L/We (baffles, not required if :> 2), . 6,3,9 1 &O � I .� � . dr storage prb�tidedat thi.s.-elemation j Y---- ' ­ I ­ . ..... ­­ 11-1 ­­­­­­(, y):' 1.3416; ­ ..­­ 11 ­ collars: 11 YES � I I z 11 I - i Slope ofd slora ,,, sides � - I depth Of waterat'spillway crest (ft) 1 680 . I I 10.3 . . I I � , � slope upstream face (Z' 1) 1 11 1. I � I . - 2:1, I � 20 I 1 slope of barrel (Sb).. . . I . I I � . � - 1.33% 3.6 I � - � , length otBarre{:in saturated,zone (Ls) , � 11 I I I � 43.1 1. - 6.0 I I I , I number� collars: required � � I required 1 2 I 1 . dirnensimbf.collars, 4.25'x4.25', 11 1.00 I , eme[genex Spillway: I w 118 I I required I capacity: (025 -Op) (efs) ­ � � .1 11 . . � - 11 '. 8.50 8.50 I � I � 1 bottom width (ft) - 27 Slope of exist channel (ft/ft) ,- ,76.;100 . . I 1 I minimum I length of exit channel (ft) I I ­ I - I 9.00 crest of sp ihway (ft) � I - 1 15 _-___,W-_ ; 1, � I�,1z Sediment Trap I design:. 1-1 ­­� . ..... -111-1 ... ­­­l�­ . . I ­ 11 , I I ..� I �. I r I I .j � % : -1- I'l"I''Ill�''l,''I''�"'I"'1;11, ­ I ... I I ­ 1--1--- --L-1-1 111-11.-'. �'� i drainage area (acres) ,(��.) � i re 1 - - ­ ­­ , I—, ­ , S) _ 1". 11 I ­­­ 1.65 � ... %1-111 ­ -I I 11 ­­­­ �� % ­ I 11 _.­ . . I I I � trap: wurnesil. I � I . 1-1 ­_ I - - ­� ­ I I I . I .. I I I 1. I I CREST OF, � I mHE)NEW I I . % . I � - 6hevation � area (sf)J_.V0Iuft1*cYY M; . ." ,/,56ww '�_ ELM � .. ., I � - � I.. ­ -.11.11 -.111. I I . ., . �: . I - . , , 631,00, 268&01 �'ll�",.,',I'"lL',�,L,.1,r_. 11 I r, . . . _ off 1 '' I I I I � I I . . . .. . - I 11 I'll J�w - i 1 ""'.", I 1--1-11-11 1. I � . . - : 632 C10: , , ,3146.0 ' � 107,9, 11 I 1. :� � I ,. . .1 ARY S FORAO I 11 .1 - .1 f 4 . ,. V I V I ��* ;� I I ­_­ ... .... I ­ .. , ,:%. 1; . 1. . . , I , : - I - 1634.0W 4143.0 1' ... ­­ , - � ... - . . .... Z � ­. I � I I -1 - - 31TO ; - , I 11 - ... ­­ "I '­ I I , � I 11 I . I I . 1 1 .... . .. -7, I.1 .I 1 ­- - _II I � 1II --11 -. . I I I IE1.T �IS.T�OI � .1 I 1 1 I 11 1111 I I ,1. .WI. ("CAVO) I I , I . � FILTER CU . �1111 "I M: MO : I mt 9."I10 8" I > =9M ­ . I , erequired (cy)( *D_) 110,6 a.1 - ,13-­ k d1�-tA-I1,1 6',­,I.'l­lL'N11M.1�-1I1. T1R1.,I'1A"I­ bottrrof stone weir .. 632"01..1111 1 wet storage oi6xAded at this WeWfi n(p ­ 1 10719 . .I�. ..I ..�1. , ,I 11.-�.1I.1.1'11Lto�I1 111I1.1' slopeof wetstorage sides 21 � ­*I* 1­P"tstora 1)'P�1,. ­1 I -r�a-,e�1l111l 1"1l .­ '_ 1 Weir len P�PN­ 0ft-(' l, 919' drystorage: Y� i , ! ; ��_:f IF�E I 1*15bottom of trap elevation (ft) ,T . 631, I dry' (9 7- �, ; I �11 .,- ,y)� (6 IDA) � - ---.1.11 I 11 ­­­­ 1 10�.6�i � Ir - . bo4tb trap di i � .1 rn ap irriensions., � � I I I 35'xI Ou I ...11 I I I I � , j crest oaf stony weir . Vires# I I 1111- -.1.1._., weir ­­ ­....... 1- _._ .... . . ... 11_111-.-1-.--1_.- ­ . 'Ir I ­.­ 11. 63310 � .......... . 1-- 1111-11.-_ ... � ...... _­ --111111111111 - I 1.11-11 I I , I . I .. I I I I � 11 - I I --11-:- , � � top of. dam elevation 1.11.1.-- --- -11-11 -1, y- gars - --- 1-11-1.11.1- --_(f0___ . ............ ... . '­­­ I I - �. ­ 1 11 � - I - I'll. I'...''," 11 I 1 .634 � __ .... 111----- .. .. ...... ­­­ ... ­­ ­­ ... --...11-.____ .� � . dr storage prb�tidedat thi.s.-elemation j Y---- ' ­ I ­ . ..... ­­ 11-1 ­­­­­­(, y):' 1.3416; ­ ..­­ 11 ­ I I I : . to vAdth of dam (ft) , � I � - - I � -p '' I 1, ­­­­ � 11' I ­ L, 1 � - 1-11 e � ... ...... � � I I I .­ - I . I 111- r. � I I z 11 I - i Slope ofd slora ,,, sides � - 2:1 I - . to trap dimensions . I , , I I - . . � I I 1 1 I 47�xl 1 3't --------L --- ­­-- -­ � SCALE: V:1 "=5' H:1 "=50' SCALE: V:1'"=5' H: 1 "=50' t . I . i I ; -605 ---------------= -----;t! , I:: -,---------i7Ic .-----------[I -------- 605 -----z-----------�----�------"--,---,-------------------;_______-- I ; I . . ! i ! _--T_...__.__ ____.____ - -_111___1.. -- __ ______ ____ I__.,__-1111_- --�11--,--�-,�-----------�--------i I . -------- ___ -,- _­__­___­___ - ------- ------------I- ;�i ; i t i I I ; ! I i i i i 600 ; i � . i I ; .------- __ -----------,---------�----�-----------,-------�--------- !------- --------- i i i . ! i ; ! i i i i ! i I , I i � � -1 i __ ______ - - -__________1__ �__­ ________1_i_________ ----I-- ____ i I—- ___ ____ - ----- � ,\ I i I ------I � ! _____] ; i I I i T i I I I i E ; I i 595 i � ; 1 595 ______ __ r --\--- ___ i _____j1_________..____t ----- - I ____ STORh SEWE R_/ \ i 24" RCP Ill ISER AT ELIE .583.1 ; ! I ; t I I \ : . i i W/36" DIA. 3" HIGH 16 G GALVJ STEEL ANTI OUTFALL AND t i I I \ I : TRASH RA K MAY BE FIE D FABRICATE) RIPRAII-�E-4- ------ --------- - --- �--,-------,--------,�;�-�------,---� -,.-- I _____­___ _____1_-____ ___ I \ ! i i i i t i GRADI'4G SHEET � � i I lutju DAM � i \ I i I - I i ! I . i : � AT TELE .586.0P' 590 590 1 i \ ! � i ; ______ ."� ------ -1. ---------- - - __ ------- __ , i i ; I ' 8' EA THEN EMERG NCY_SP_]L_LWA ( I i . i ; i I I 1_� ! i i I I ; \ : WITH :1 SIDE SLOP S ATE _EV. 58 �.13' 1 . I I i , i i I C YCOKtUL)A KEYS DINTO THEE ; i i I . i ___GR __________________11_- ----�----------"--,--------,---�---- I -- I --- -_ --WITH-V--c;CARIFI�D KEY FOR I ; , I I N IND - � . I . i i i \ i ; Cok, ESION AND 6- TOPSOIL MIN. 25 -YEAR I I I i STOR ' i I '� I i - _T 585 i E I'ti i i 1EV, = 685.00' ',�411\1. ��l� i i 585 ---.--,-----,----, - .---�---------------------------- I 1. i j i i . : ! � \ __.. 4 ! i i RISER TOP � .. �, �_� �_A ! 1.68T L., ! ; i I 1_* i I ��,`­ ", - �) ��,'.�����--��-,.,.*--.*,��-.-��'.'����,-..iz�:� I I 1 ---- - ---- - - 1__________� I � �__ ---------- ELEVi = 583. i 3' ��".. ' �4 � -1 _ - ____________________ --------- - - _- � ... . .--- � I -----I,------- � 9.4' VIAX I � I � i 6" DIA. 1 1 ; . =� I I . iI � " G I ���',���--------_--------_-_----- ��,__,_N______ IN AR_i, 1 580 . 580 1 0EWATERIN--A I ----- _________ i I - - - ; HEIGHT _E_TUl3fIVQ___ - I ; . -------DEVI ., I C - I i . I - , 4 i t I AT ELEV. 580.56 i z i 1 4 2 , , I I I f CLEANA, �Q ; --- ____ - T, I j I _________ - _­__------- ------- �____ ____ - - T - - ----- - ___________ ! ! i 55�_8.89 i ) i !!; _VD_OT S_ T 575 \ ECA CL . i. 575 ________ __I___ B_6TT0M` _ ---__T ­___RIPRAP_ BASIN RISEN I j GEOFAB_R_ IC FOOTINGE�EV. 57E.60 UNDERLAYM ENT ______­ _- __ -__ ,--------,---------------___ _______ L= 13'; W1 =6'; i ! i (2) 6'x6'GALV STEEL' 24" RCP 11 W2=19'; D:=1.4' : i i i F 570 i ----�-------;iiI1;; --,---1-------�iiIf;;: ----- ANTI-SiIi.;IIIrI EEP COLARS!i 570 ------- _RREL__ : L=60; Sz2.51%_ 568 ! INVIN. 56.00 568 1574.49 " N . cc . 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' � __ I Q I D I \ 1 -7- �____­___ -"_,-,,_,_ _/_'-­ . /./ I I � ,-­ N � , ��­ I �v I � i il ,�­1__________ 11�1� � ry *.44� (0.02 ACRE / I '� I I f 1� 1�_-­__, 1M6/>6XX`/"""­N IM/1 'A IN- , , I , � - - M, ,g,�,;<��,-�\ �,-, , * / �, I"' /' / - . , - . M X, -4 .s� o . "", "x � p N . ___/_ � I _ . " - � - * . . . . � - N , I _1_1-1� . . . _�-:, .1 I I I r '. i " ,____1 , ��, , -.1 I -0 % - - ­_ Q) c 'I I - _-__,:i�­ � / , . � * __ — � " / / / // I I-- W-4 -,-- -r X: - u Q) � I - --­--­-_�__� �_ _� -, If __1 - I I - V5111 / � -� �-, < � : 5g, � - � , . , - --/I- ___ z . - . / - . .------ -- ___� I � i � 11 I ___% >-`�/ , , // - " , - < < \ ­­-7-�_­ - - -71 1 .o�#, - 11 ,� , __ " 5" � ,;Z,� "&', ,�, . Ng ",-,g — ", F x , ;�;,� � j�, % ___ ­_ - - __ , I-- / -----,---,--- z - - , , ,wl -1-0 " I \ ------------- ____ � �, / 11 __ � , , - \ , -6 ft - I __��.�. �,T!7. , - �, - , , ��ggx'p_-,�(---� ­- 11-11--k fj .. \ _�% _< / , , - / go . MITIGATION AREA PROPOSED WITH THIS PLAN = 2.48 ACRES + 0.32 ACRES = 2.80 ACRES 0 CL < � __ ­- _- _____ 'A", I ,_1 "I `i` 1�- �, , I 0 � - 11 'I, ,- - - -'I,-- V'1� I- I 11 , "D a -1 , - __ - .. X,�� 11 -1 I ,_ lz ,�� '\ , , 0) U) � — " , " I,- __ llpl� '<��,Z� 1_4 � u) ) �-­ __ , . .. - � " ,�_�!�.) , ^�,'w.'xy,,,xy_`,\ , , , \5\ 1 \ - . _______.___ .. �, - I , j." _. 511,110101w," �. v �, "A) w U) (1) Q) I I - ,:. ­_ - �, - -----_ I ___�, , ,,­­­,'� � , \ :1 � . " . I ___ �", I If 1 \ ", 9 , 5 ) 'TIGATION AREAS: � F— -a 0- - , - ! .,,- - ; � ,-, , / �/ , ��,x , �, _j 1-4 - Q) _:; —___ ------%- - ��,_, I ** ,�, , --- / I , �" :DLINGS = 2.80 X 600 = 1680 _j - I .. __ � - I ./ >�� x"', w C a) ___1' Ill — — I -\1 ___-, A 1. -1 I. 1. lxvvx��V­w � - "_-�­ I- /_ __ __ __ - p__q - � _�,_ � — _#__ � , -.1 __ - / I/ � , W, z I \� " \,\ -, - 7- _�, �, ,_ � 6 - -, - � ", _r E D I I �� ,1� - �>,�:X,I�-,-x xa,�Z,161\ IN "�­ - __ Nu 1 tz:): �,,,N, x Alll��' -,-,- -- --, ", �, -&-'K , , , � , ,� `_ ­ ,� "��,V­�' ! I � ,, I - A �', .� �_ :D 0 1 "'. " 1� 1� kNTED AT FxFON-CENTER WITH TREE TUBES AND MATS IN = _1 __­­\, �, i � W,_",,� / ___ T3 ft,_ -, c ____ , I �t I ;L;_ �__� I---- _- ( ACCORDANCE WITH THE CHESAPEAKE BAY LOCAL ASSISTANCE DEPARTMENT RIPARIAN ul U) UJ a ?�: I I --- - s _\ "I'll" ; \ � � � ; \" '1�1� ',/'�,,.,<�,���,1,1\�,�-,�,�,�,-',,,V., R- _'11C - 'X 1Xx I ry - , tv - - - - _-xx­x-­-­ __ BUFFERS MODIFICATION AND MITIGATION GUIDANCE MANUAL. I ., >"</o, 0 0) ___ I � '95 _� ­ x I'll- �,­v,-­v -:x. " - K " X, 5K'X,(X x X � 1� -�, - - , I -,-_ I , - � . " �', �. __ "r __ (,_-:-_-;]�� z �_ Nvo z - �,;6 -- ­_ I Q:� __Y _­ - 0 �1' ­w1lFM&1_1Ke1"x_1s15$1� - - Lij Ld , , I - ,/� "I �510` - ', � � , �A� �, I '\ _­_ 1 2. IT IS A GOAL OF ALBEMARLE COUNTY THAT A MINIMUM OF 85% OF THE TOTAL PLANTINGS 11 - _1__� - -�­ . � i'_'11 I �,_,l ',.��,/ I-" 'I', REQUIRED FOR BUFFER MITIGATION BE NATIVE PLANS FROM THE COUNTY PLANT DATABASE. 2 U) I - - _111- i , __ w - ______ - - - A^ 1� I . � 4� - % t z � �� 3. MITIGATION AREAS TO BE INCORPORATED INTO EASEMENTS. C5 r - 'N - ,,e- 11 - A ) �A 1�,,-,, "'n NIN ,%,-X1­r""","v" I i ____ __ __ i I i X, I , - e I - - - , - 6 , ... � � �, ­;,��­­­­_,,,w, -,v 6 / ___ 1. Q� ,/, � w �_ z - . - ,� � . " -"� - -1 -14 1�__ __ � , " �, �"v/ , I � , , , 'K�1` � � " - uj � I.-, � 5, I'll, IN �;111 / - u - - 4_XXII� �11' � ­ - . , � . " " ,'!� ` `-'/-,� V) � 11 - ; I- " K""",<9 W, __ - � U) 0 � _�,� I 11"N' � I/ 1� 11 - U) � I I I � 11\ 6x X ,)� , _y � / - ---, _�, _H ____ _,_� 'R 5" �� - ,� X, x -1 __ - �, I I ,,.,,- -,1111;1 11',',,� ,� �, o", � I " / ---,,-----,,-,-,.---- PLANTING NOTES: z , L, -- A " X I __ __1 // �. - V) 11.1,,_ '_ ______ 11 ,/ - - 1. THE PLANTINGS SHALL FOLLOW THE STREAM BUFFER MITIGATION PLAN. _j c __ �, ' ' _OWO� s __ r "_ , 1- �; �-��'ef�e�" 4 ,C-/ �__ I 1� - 11 ,. __­ ___ uj _j 0 --, '�_R,��`,`�6�0�1� /� - , , �_,N -"rl- " 2. THE FINAL PLANT LAYOUT SHOULD RESEMBLE A RANDOM AND NATURAL PLACEMENT OF PLANTS � I � "A"V, , l.� U I -,,,>I , ,,,� "", � - _11� �, _-__:�_�__ __ � /I , � 0 ­'>j�_ , - ,_ 1\ I u I" I ,\� . _____ , __ --- - - , __ �___-- "e I 11,� , - "e �_ - � , __ __ _�_ I 11 �26w,_4_ 1'��_ 11 __ __ RATHER THAN A STANDARD LANDSCAPED APPROACH WITH TREES IN ROWS OR ANY OTHER 3: 0 .- I I I ��___ : . I § m- � 5XISY, - I I � 1-1, 1-1 ___V__) z , �-_, 0'_1 __ , \ "Y' r ,� ___- � -11 "\\ __� 11SA __ " , " / _� - w � , � -_ I : -1:1-1 ,�, _- Ill, ORDERLY FASHION. _0 I \ . I � ____ : I 11 _,_<�\,�� ��_ I", >1 c: . __ I I � 0 )p j �,,�", __ I " __ �, s SO- __ / " - 3. THE CONTRACTOR SHALL. WARRANTY THAT A MINIMUM OF 85% OF ALL PLANTINGS SHALL SURVIVE w 2p i ,\I- __________ �_ __ "11 ,�c? _- / / ,jRRqPO$m MITIGAT�WAREA,, Q) I � __ __ _s __ _,��,� IS.---- �' -1 - Ill/ ,;2,,1q_­AbRE ___ 1-1 11��, FOR A PERIOD OF ONE YEAR FOLLOWING PLANTING COMPLETION. I w a 6 __ � __ __ �_, " S�' __ , 11�, , L,c: __ - - -'-- __ I I I- _", N "', " 111� Z, , I-- - ___-, l� '__ 4. THE CONTRACTOR SHALL FURNISH NURSERY GROWN PLANTS CONFORMING TO ANSI Z60.1, WITH < CL 16 � " \ I -S __ � x - ,_ - I , - -I' -11 . - 1H " __ , " , , . __ -,-,-. - o �2 i ", 1�, �, __ � z 11 /11 1, I �, , I - - - \ ", ._� HEALTHY ROOT SYSTEMS DEVELOPED BY TRANSPLANTING OR ROOT PRUNING. TREES AND (D i 1� -1 -/WH s __ _� � __1 ,,�,,� I - - �, ---,- ---��-----____:� ,.- \_ \_ .� -0 __ � I- �, "I ,� , , � I cl) (�', , , __�� I/ " �, " �� -1- - ________--1_____._._,. � " ", - -, - �' I - , '-- " " __ SHRUBS SHALL BE WELL SHAPED, FULLY BRANCHED, HEALTHY, VIGOROUS STOCK FREE FROM :3 [� --_1____---_____,___-__ , � 11 "I �, I ,_1 ____ u .0 � I ----_ __ _­ __ , ", � ---, -,,, ,,�\ C) 1� _)�"., ---,--- I ^�^�� I- / __,:� , _�__ - .� " , DISEASE, INSECTS, LARVAE, AND DEFECTS SUCH AS KNOTS, SUN SCALD, INJURIES, ABRASIONS __ ___�_� ___ J_�� _0_____/ __1 -, -1 ­�' , - ,�, �', �, , - ,--_,�' ." \ X C) x ��_ ,__1 \ -__1_____ '1.1/ _1� �, 11 r- 1 - - � ,�, " -"-,---- - 11- 0 0 () �, "��Z__­______ -) --- -, - 1WH -, - -, " \', " AND DISFIGUREMENTS. 04 :3 I / __ Z ... j__1 � --.-- I . I ,-,---I-,--/- '___ �.�, ,,,, a) � I �. , ".,-, ­�, 'I" �_ ­ ,::� � - ,> -C � '. �/ __ ______ mm , ___ ____� . ,--jr ",��_,�J�_--`_ �,­ - . __ I " 5. NURSERY GROWN STOCK SHALL COME FROM A LOCAL NURSERY OR BE ADAPTED TO LOCAL - (n " \ \ / . . __ " HA 1 APPROVED / __ 1� _�111� ZI-A,4H_ 80 - / - _"�,_, 'I,' 1'�_,�,,_­�'_' -:��_,-­__,, __ �1� F 1\ I ___ - , __ _----- _- __ ,` -1 1- _.______­ , -, - ___1_____1 1��, GROWING CONDITIONS AND BE GUARANTEED BY THE NURSERY AS SUCH. Q) 0 4 1 1, , 't_� r-j'-'­-;�, � � - - - __ �' "-/- �_ --M jq� �IC Af�EA JYP_.� , , � I I-- --- __1 _,� "-l'Z-�'���'-��:��-.:��:�'_-7---�-'-.-.- - � I �\ 11 _- , � - " , I � 0 "I , " --- �___�_ I = / __ __­__� f,4--' /' � 11-, -,: Lu 0 , --_s _� ,I - �y � __ , - - " - \ , I ___� _ /" " ,�,-.�', - — 1�? _j I / - ,�� �, _��', - 6. THE CONTRACTOR SHALL CLEAN THE TOPSOIL OF ROOTS, SODS, STONES, CLAY LUMPS, AND 0 \', - 1� i, , lk ____ / . _,�­` ,� / __ � I `_ ,�' 11 4- � . , " :::� �� 1* - u !::� U) - ___ 3 � __ � I ,� , " - ", �, _­­ ___ _-, 1-11, � __ / _� / �_ c: -05 1--, __ � --l- , ,%, I _� ASE 1 APP ,_- � , 1�_ 0 Q) - � -1- I - . � , "� - / i \ I __ � , I J_j ' ;;:�� X, � e� - --,-- OTHER EXTRANEOUS MATERIALS HARMFUL TO PLANT GROWTH. I - I- � __ __ , " "_ , - v I - "I" _-, ,,� -",/,-".�-;,�'_�/11_ , ', � �', �-,z�­ ­.- I - '�� R(jVE[j' �, 1- 1, ::� ,� �, Z, ,�, , " �, " " �>_, ______ P\ � .� c :�_�, P -H �.�11 _� � " '.. / �, _­__ __� t5 , - - � �. , W �_ \ I_ I 11:1 I I I _8 I - � __ - 1�,__ � _- S I �t,ll 'IGATION AREA (TYP.) / , ,,� �, - ".- -1 / '..".1 / j, � / ", �, , , � � 7. THE PLANTS SHALL BE SET AT THE SAME DEPTH THAT THEY WERE GROWN IN AND THE TRUNK -I �­ � � - 101 I _-, , / , I 11 I." __ - -e_ r :5 � I \ I _V� ---A, '�__% __� - � / ;� .11,� "_ _�,_ Lu 1� I �- 4', ' "- - - ____ __ ,/ .. 11 __, 1 � ; SHOULD BE SITUATED NEARLY PLUMB. TREES AND SHRUBS SHALL BE STAKED, AS NECESSARY, 0 Lu / �_ �___ 11-11l, I - 1� � / , , , � , I ---- _v 11 I N�11, Rp , ______� -____�__. � � 1___. \10?_��' I - I ,�, __� / / // " " Z Z ", /�,,- -, cy-1 = a- -.11 Ilk, __ � � � A\� �' / / �, �L' �-- __-, ,,­, / /I ,` / " / �1 z , , , �� - CL I U) -a- - �', �1, " I/- .1 t __ I , - - I r _/ /�, I I � I I TO PREVENT THEM FROM OVERTURNING. . _u c ___ " , vc CD .I- - --- --- _/ �_ \ �� _ � __ - "_"/"/ / - X , - 0 \ ." I - 11 /I � - /� � X.1" / '/ ,�, /�11_1 :�� 8. ALL VEGETATION SHALL BE WATERED THE DAY AFTER PLANTING AND THEREAFTER AS JOB NO. Q) / "I "�_ 11 - ....... ­ ...... _._____- ____ OVED I- \��s , --- / ,/ , /� "/`/ -- �/ % - � I I - _t_�� _� ,, - I �1 I / 11 ,�_-- 1Z., / / ,,�, ,/,� � / - - I ,\/�, --____---_Z'- I *� \ --k I I ".1 �1` , NECESSARY TO ENSURE SURVIVAL UNTIL THE END OF THE GROWING SEASON OF THE FIRST YEAR. .0 D � — / . - ��,/"",;� ,,, / ., , 72 -0 �_ , - -1-1. "I \ - --y - I I IGA I ION AREA (TYR) / /I /I "_/\_J"_� _: - __ __ _Z_ h I "'-���� ' _� i I /----�,---",-­, /�� I P-11-1 ,,-,---,- - 1>_11 11 1 /// 1120 , 1_1 - ­_____. \ L>---,- N _<� - - __ --A__A-N-A H6ASE PROVE I 11 / / � .., I ,/11,11", 9. THE GRASS SEED MIX LISTED ABOVE SHALL BE SPREAD THROUGHOUT THE ENTIRE STREAM 0 ___­ ------ __ , I " - - - I ---- -1 N 1� / , 1��//' j . // I,------ I ­­ 1-11 -----. , � �_­_ '�'. 1, ---A 41N . � � __ _, Z I , I / .1 e / ZZ, /"/ I 71 7 / � BUFFER MITIGATION AREA. a u) I - \�l­�--- ____ 11 , I __ I �_4�/_ - __ ___s1_ ___ __ __ __ 11-1 �, I (X,_,�., "I / , / " / // / SCALE �� �., __60_____________,_ , 60 - I - I � KITI ATO,N-AREA�_ - ��,V-\,­�, �, . / /I / I � , , �/ _� � % - k \ A�N � 'V- I ,I,// / / _�, �, D __ _`_ ����_­__ \ - - ------ �o __ ___ �, / e, / - , , __ :��_ -, - - - - - ___ - PROPOSEDSTREAM -, _,_� ,/ ( I I - // / / I / ,,,,, ,,;,,,,, 10. ALL PLANT MATERIAL QUANTITY COUNTS ON THE PLAN ARE THE RESPONSIBILITY OF THE _2 1 ------------- 1 R�2,-�.- --- 1'�_ 1-11-11-1- / 11 / ft - - ��_ - 11 i _� /,/,/ / O.E -,-- r- -1--1 __ 1, �­, ^� I , � -1 . -,�,, - / , / �, �/ � , - - UFFERIMPACT �<. 1,5 - - - ­-� ' 1-1 I., - --__ I? �, ,,` I I e __ - - " "" , , � i ,� (- ','�-,_��' I / / ___ __ - - " \ .. �_ __ - -1) CONTRACTOR, PLANT LIST TOTALS ARE FOR CONVENIENCE ONLY AND SHALL BE VERIFIED PRIOR 1 =60' " , , I 1, - �� - - 1(1p),�, - I ,--15ROP - / I �/ I / (n � � -1 ..... I p i t7 �11 � - \ 1. - - _1086 STREAM � ,:�) �,, � __ " 1-� --,S_ -1 , / TO BIDDING. ---I"-- I / __� ''I'll - ___ I , ", 'I -1 -V _,� -1 -, .... ii ... ��., � �Z' � ". _� 1_�`,rlry __ _,_11 ( I 11 ___ _11--, I I , _"� ", I H, FEET / �� (0.05 ACRES) `4-��'VER --_,_ ��, I 7 -_ ��_ __ > � 11 I ) \ "I, s -BUFFER IMPACT 11-1 � " 11 f­�,:� - __ -"--. � � " / // /, � -a Q) �\ ---.-I---- ,.--, �. '�_____ ._­_ n u - _____1 __� - _-____11 :_:�;� i I I j /, , 1 1. NO CHANGES TO PLANT SCHEDULE UNLESS FIRST APPROVED BY THE ALBEMARLE COUNTY SHEET NO. ,_ ,� ---. *-.* I - _.- � __� ___,� ,_,__._---_.______, � - 0 _____ �___�� _____._____ `�. - , _11\ ,-ft EA , 4 ,�� I ,/- _,, f t \ , ___ 1". ,.�` AR _���ES) __­'_­­_ - ------- -1 " - ', (n .,,�, .1 ",­­­ --ft c �-� __ "'' , ,__ ,�� 1- _,_1_11 I ___ - :,", � "�, - ___­­_­­____. 1,,,� i � ;�,,, ;­ 0, 0 4S ,'­--­-- -i,�, __ '1111� -V-V-\ 1�_� - - - --ii, ---,--,- , , , - I --, - � 15 - � "I" . A,9\E ____ 31 , I - � i I /I I PLANNING DEPARTMENT AND THE LANDSCAPE ARCHITECT. Q) � i - ____ � - - 11 ___ � " ,��. - - , - 1, , "i'4R04 ��_--- - % / i"a, , K 41"A 'we � - -7-111IF-o- �_, _;;� `_, ___­ i i" ��, "',_ I - ­­_ - ___ , I g_: -E _i��f ,FV- w -- ___ _.:::,- -, �, I --- '/ ___ _�_ ____ ,- , -1, __", __ - I I I E 3z f _1- 11111*�­ - -"o, ,N-��, ­­ , 0� I ­ - mi� 1, �,