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Home My WebLink AboutWPO201300016 Plan - Approved 2013-03-01VVES. TLAKE HILLS SUBDIVISION GENERAL NOTES OWNER: L/CK/NGHOLE CREEK, LLC 2421 IVY ROAD CHARLOTTESVILLE, VA 22902 DEVELOPER: R/VERBEND DEVELOPMENT, INC. 321 E MAIN S, SUITE 201 CHARLOTTESVILLE, VA 22902 ATTY. ALAN TAYLOR ENGINEER: COLLINS ENGINEERING 200 GARRETT ST, SUITE K CHARLOTTESVILLE, VA 22902 (434)293 -3719 PRE— APPL /CA T/ON CONFERENCE. JANUARY 23, 2012 TAX MAP NO.: 05600- 00- 00 -095AO 1 DB 2733 PG 150 EMSrT-4NN�- GONDIT101 dS 05600— 00— 00— 095BO 4VC4R ^ALL -SIB AP DB 2733 PG 150 _P+-rAvE-I-LXYOUT PLAN 05600 -00 -00 -05300 RASE -4 ;AX 67-P6AN DB 4024 PG 489 TOTAL PROJECT AREA: 05600- 00- 00 -095AO — 37.95 AC. PHA�SE-F -U W-P -J , 05600- 00- 00 -095BO — 76.49 AC. --PHASE-1-GRAD r_1 Pz AN & OVERL-OT -G RAB4N1G-P-LAN 05600— 00— 00— 05300 — 25.49 A C. Pl -4AZSE 4 GRAB4NIErRLAN & 9VERLOT- 142.9J ACRES TOTAL PHASE 1 PROJECT AREA: 46.09 ACRES ZONING: R -1 RESIDENTIAL B-NO- TES -- &-DETAILS CLUSTER DEVELOPMENT AND BONUS DENSITY STANDARDS ARE BEING IMPLEMENTED DENS /TY ALLOWABLE DENSITY FOR STANDARD LEVEL CLUSTER DEVELOPMENT 0.97 DU /AC ROAD- 8- WA- TERL4NEE PROFILES + 59 DENSITY BONUS FOR STREET TREES AS SPECIFIED IN SECTION 32.79 ,. ROAD-& -WA- TERLINE- PROF-ILE& = 0.97 x [1 +0.05] = 1.02 OU /AC PROPOSED DENSITY- PHASE l: 47 UNITS 47146.09 AC. = 1.02 DU /AC. PHASE I OPEN SPA CE. TOTAL OPEN SPACE PROPOSED = 16.74 AC 16.80 AC / 46.09 AC = 36.57 TOTAL OPEN SPACE REQUIRED THIS PHASE. • 46.09 x 257 = 11.52 AC. 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 FEET SETBACKS: FRONT.• 25' 25 SIDE. • 15' 26 REAR: 20' SUBDIVISION STREETS: CURB & GUTTER WA TERSHED: L/ CK/NGHOLE CREEK WA TER SUPPL Y WA TERSHED AGRICULTURAL/ FORESTAL DISTRICT- NONE TOPO & SURVEY TOPOGRAPHY IS COMPILED FROM SURVEY BY A COMBINATION OF ROUDABUSH, GALE AND ASSOCIATES EROSION & SEDIMENT CONTROL PLAN PHASE 1 AND LOUISA AERIAL SURVEYS INC., JANUARY 2007 EROSION & SEDIMENT CONTROL PLAN PHASE 1 BOUNDARY INFORMATION IS COMPILED FROM BOUNDARY DATA PROVIDED BY ROUDABUSH, GALE, AND EROSION & SEDIMENT CONTROL PLAN PHASE II ASSOCIATES DATED APRIL 2013 AND ALBEMARLE COUNTY RECORDED SUBDIVISION PLATS DA TUM: NAD 83, BENCHMARK LOCATED ON TOP OF EX MH CZI —MH -85 EXISTING VEGETA T/ON: PARTIALLY WOODED LIGHTING: NO LIGHTING IS PROPOSED PHASING: SITE TO BE DEVELOPED IN A MINIMUM OF FOUR (4) PHASES. FINAL PHASE LIMITS TO BE DETERMINED LANDSGAPING- WITH CONSTRUCTION PLANS AND SUBDIVISION PLATTING. ALL OPEN SPACE MUST BE A MIN /MUM OF MITIGATION PLAN 257 OR GREATER FOR EACH PHASE OF THE DEVELOPMENT. PARKING: 2 OFF— STREET PARKING SPACES SHALL BE PROVIDED ON EACH SINGLE — FAMILY LOT. ON— STREET PARKING SHALL BE PROVIDED AS NOTED WITH THE STREET DESIGN. BUILDING SITES: PARCELS 1 -131 MAY NOT BE FURTHER DIVIDED. A MINIMUM OF 6,038 SF BUILDING SITE AREA IS 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 PHASE / AREAS.• LO TS. • 22.15 AC. RIGHT —OF— WA Y.• 7.14 AC. OPEN SPA CE. 16.80 AC. IMPERVIOUS AREAS. • ROADS (INCL. SIDEWALK): 5.77 AC. BUILDINGS/ DR/ VEWA YS.' 6.17 AC. TOTAL: 11.94 AC. CR /T /CAL SLOPES• CRITICAL SLOPES ARE EXISTING ON SITE AS SHOWN ON THE PLAN. A SEPARATE WAVER REQUEST HAS BEEN APPROVED FOR THE 1.40 AC. OF PROPOSED CRITICAL SLOPE IMPACTS UNDER THE PRELIMINARY PLAT APPROVAL SUB2012 -38. NO TES.• 1) THIS PROPERTY DOES NOT LIE WITHIN AN AGRICULTURAL AND /OR FORESTAL DISTRICT. 2) ONLY (1) DWELLING PER LOT SHALL BE ALLOWED. 3) THIS 100 —YEAR FLOODPLA/N LIMITS EXIST ON THE SUBJECT PARCEL, PER ON FEMA MAP NUMBERS 51003CO229D, 51003CO235D, 51003CO237D, & 5100JCO245D ADOPTED FEBRUARY 4, 2005. THE PROPOSED DEVELOPMENT SWM POND /SEDIMENT 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 VDOT 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 I ROAD PLANS WHITEHALL DISTRICT ALBEMARLE COUNTY, VIRGINIA 0 9 SHEET LAYOUT SCALE: 1" = 300' 0 0 n VICINITY MAP SCALE: 1" = 2000' Sheet List Table Sheet Number Sheet Title 1 1 ENGINEER VICINITY MAP SCALE: 1" = 2000' Sheet List Table Sheet Number Sheet Title 1 COVER SHEET ENGINEER EMSrT-4NN�- GONDIT101 dS INSPECTIONS 4VC4R ^ALL -SIB AP ARB _P+-rAvE-I-LXYOUT PLAN DEPARTMENT OF FIRE RESCUE RASE -4 ;AX 67-P6AN ALBEMARLE COUNTY SERVICE AUTHORITY P*IA&E-PJT4N-PY -PLAN VIRGINIA DEPARMENT OF TRANSPORTATION PHA�SE-F -U W-P -J , HEALTH DEPARTMENT --PHASE-1-GRAD r_1 Pz AN & OVERL-OT -G RAB4N1G-P-LAN Pl -4AZSE 4 GRAB4NIErRLAN & 9VERLOT- z 0 a VTE-kJT4L VT-Y -D E -TA 4 � O Q NOTES DETAILS M z 0 B-NO- TES -- &-DETAILS � w o U ROAD ERLINE-PROFILES ? cn _j w ROAD- 8- WA- TERL4NEE PROFILES 1-5 ROAD-& -WA- TERLINE- PROF-ILE& 4 N" TY ,EVVER_PROFILES 17 - DRAINAGE-AREA-PLAN FNAGE- PROR6E5 DR AIM GE-PRORiIL -ES RAINAGE- PROFILES DRA4NAGE-GAL-GULAT. 3 RA4NAGE-GAI_GULATIOP IS DRA4NAGE- GALGUL4TI0 25 STORMWATER MANAGEMENT PLAN (PRE- DEVELOPMENT) 26 STORMWATER MANAGEMENT PLAN (POST- DEVELOPMENT) 27 STORMWATER MANAGEMENT DETAILS 28 STORMWATER MANAGEMENT DETAILS 29 EROSION & SEDIMENT CONTROL NARRATIVE & DETAILS 30 EROSION & SEDIMENT CONTROL PLAN PHASE 1 31 EROSION & SEDIMENT CONTROL PLAN PHASE 1 32 EROSION & SEDIMENT CONTROL PLAN PHASE II 33 EROSION & SEDIMENT CONTROL PLAN PHASE II 34 EROSION & SEDIMENT CONTROL CALCULATIONS 35 EROSION & SEDIMENT CONTROL CALCULATIONS 36 GSGAPING- LANDSGAPING- 38 MITIGATION PLAN 39 MITIGATION PLAN TOTAL 14 PAGES ( NON WPO PAGES OMITTED) FILE COPY This copy of the approved plan is reserved for the official files of Albemarle County. Please do not remove this plan from the file. ice' 9aiiiuli?j��iC��i'u9, APPROVALS DATE DEPARTMENT OF COMMUNITY DEVELOPMENT PLANNER/ZONING ENGINEER M INSPECTIONS M ARB M DEPARTMENT OF FIRE RESCUE M ALBEMARLE COUNTY SERVICE AUTHORITY w VIRGINIA DEPARMENT OF TRANSPORTATION w HEALTH DEPARTMENT COLLINS ENGINEERING IS NOT RESPONSIBLE OR LIABLE FOR ANY CONSTRUCTION OR DAMAGES TO THIS PROJECT PRIOR TO ALL FINAL PLAN APPROVALS. H 0� SCO R. OLLINS Z U No. 35791 ti z 0 a U Cn w 0 z 0 w U) Z w a 00 H U) H W w 1 Ul Z �1� cr) r ti M M O N d' d' i O N N W J _J W F_ 0 LL Q U i f— (n WN L.L W Q 0 O N W w 0 a Za T a L o Q 0 �z o � w Cw z H a� �z aW W �N oZ Q_ _j w o � U W0 0 0 U3 C �/ J N ) 0 W o J lidro � C U .V� _..1 W >0 3 _ p Q) V) N w U x J Eo CD cn Z c cy W V) w� wV) z 5 �c 2.0 Ld U z J � J 0 o ° o� T a L � o� a� Cn U o U U V) z w o0 J � N O Q) 0 Uj a � 0 JOB No. 112072 0 SCALE ° AS SHOWN ._ co �L SHEET NO. a a o 0 No � 3 M M M M M M w w }�- z 0 a a¢ � O Q Z LU � O 0 P-4 M z 0 H w O U � w o U U o Z O¢ > cl� ? cn _j w 0 > z 0 U w °- U) cn N a Z w w > z 0 U W O > z 0 U w D > w N w w 1 Ul Z �1� cr) r ti M M O N d' d' i O N N W J _J W F_ 0 LL Q U i f— (n WN L.L W Q 0 O N W w 0 a Za T a L o Q 0 �z o � w Cw z H a� �z aW W �N oZ Q_ _j w o � U W0 0 0 U3 C �/ J N ) 0 W o J lidro � C U .V� _..1 W >0 3 _ p Q) V) N w U x J Eo CD cn Z c cy W V) w� wV) z 5 �c 2.0 Ld U z J � J 0 o ° o� T a L � o� a� Cn U o U U V) z w o0 J � N O Q) 0 Uj a � 0 JOB No. 112072 0 SCALE ° AS SHOWN ._ co �L SHEET NO. a a o 0 No � 3 M M M M M M w 1-4 m o ice, 1-4 Ln N 1 Ul Z �1� cr) r ti M M O N d' d' i O N N W J _J W F_ 0 LL Q U i f— (n WN L.L W Q 0 O N W w 0 a Za T a L o Q 0 �z o � w Cw z H a� �z aW W �N oZ Q_ _j w o � U W0 0 0 U3 C �/ J N ) 0 W o J lidro � C U .V� _..1 W >0 3 _ p Q) V) N w U x J Eo CD cn Z c cy W V) w� wV) z 5 �c 2.0 Ld U z J � J 0 o ° o� T a L � o� a� Cn U o U U V) z w o0 J � N O Q) 0 Uj a � 0 JOB No. 112072 0 SCALE ° AS SHOWN ._ co �L SHEET NO. a a o 0 No � 3 �--- \\ / I _ �\ i -- �� - - - ' - - - -'- -�'' /. 1111• / _ - -- J . , . \ \\ \. \ \. \ - \ \ \ -\ \ \ l - - - . i / / / 11 / / - - I I 1C \ \�`- \ _' /� • \ / . - �- - - - - - -- `-� / 1111 _ -- - \\ \ \ �\ \ ` \ 11 11 / \ \ / / - _ - - , _ _ _ _ ` - \ \\ \ \ \ \ ` U.S. Department of Agriculture FL -ENG -2 f ',� \\ �'�" ` \' - - _ ' 1111 =- ____ \\ 1 ` s \ \ \ / / / -_ \ \Natural Resources Conservation Service 06 04 / ��'�'TH �� \ - •1111 / \ i _ - - ,\ - -�--_" \\ \ \ / k \ \ \\ �\ \ \ '-,- \ \ \ \ / / / \ \ i ___ -- - - -�� I \\ --I_ -y ___ - - -_ _ - -- - __ _ � _= _-- ____`__ ;�\ `\ \ \ I ( /'f t \ \� \\\ \ \ \ \ \ \ \ / / / \ 1 TR 55 Worksheet 4: Graphical Peak Discharge Method -__ cn rr-__- -�. _: _ =- _' - -_ - - - -- _ �-________ -- _ -- \\ \\\\ \ \\ \�.`�\\ \ \� -- - \ \ \ \ \ \ \ / / / / / / 1 SCOTT R. COLLINS_Z __ _`\ \\ - -� t. _ - - =-- - - - -'� -" ,y- -_ -_- _ - - -_ __ 2 = �_ __,_:, `, , \\ \� \\ \ \ \ \ - \\ \`� \ `\ \ - - ` Pro ect: Westlake Hills Date: 5 14 2013 i U No. 35`791 � \ - - - -_ - - - - -___ - -- \ / -,, -, \,� _ - - _ _ €�"� - _ - '- - - - - -- _ `\\ \ \\ 3�\ \ \ \\ '\ \ / 1 Designed By KKW, PE / / �- / / \`�� \ \ 1/ I - - -- -` y 1111 - - __ =j �,�- �� _ -� \ \�\ \\`\ 1111\\ \ \ 1111 1111 \\ _� \ \ / / I I Location. ng Checked By KKW, PE to / / �� - _ '\ \ \� \ \ \ / �� =, - J J 1111 \ \ �\ \\ \\ \\ \`\� \\ \\ \ \ / - - _ _ _ ` Crozet alo Future Connector Road : Da : 5 14 2013 .c \ ` 1 I \ ��S I C \� \ - \ \ \\ :_\ \ , / -E = -- ` -= I "} -�__ _ _ �' -' Z \\ \ j0---- - -\ \ \\ \ \ \\ \ \\` \\\ \ \� \ \� } \. \\ \ \ \ / - - -- �\ \ \ \ 1// I -� `�\ 1111' 1111 /� "-�� I - ' -� ` " - -_ \_ = �.. -_� -` -- 1111 `\\ \\ 1111 \ 1111 1111 \ 1 -�� \ / / S �Nt\L \ \ _ \ \ \ \ \ \ I \ \ 1 \ - - --� \\ \ \ \ \ 1 ' \ \ 1111 / 1111 '� __ �_� / \\ \` _`_ -__ \\ \ \\ 1111 \\ \\\ \ \ 1 I \ : \\ \\ \\ \ i / / I \ \ p Check One: Present X Devefo ed X -' _\ \\\ \\ \ I 1 II I -� !� __ '� - \ ``�' 11,11 -,- ____- / \ \�~ \__�_ - -- -�� \\\ \� 1111\\ \\ \\ 11111 \ \ I \ \\\ \�\ \\\ -\ )' \ / / i / - \ 1 ` \ \ \ _ -- \ 1 � I � I l 1111 /�_ "` -- ��\ \\\ \ _ /I 1111/ 1111 � - �- �46'� 1111'-- \ \ \ ��\ \\ \ \ \ \ �\ 1111\ \ \\\ \ \\\ 1, \ �\ \ , \�\ \ \� \ 1 � / / I --' � / � --- \ \ - \\ ! ! ! , / "( �\ \ \\` ,, , 1111 /i - --__ �i \ \ \ \ 1 \ \ \\\ \ 1 \ } \ \ I 1 \\ \ ? I '\ - �- / / ' \ \\ \ % �I/ / / I1 I I \ \ -i/ / \ mac` \ 1 \ 1 \ \ \ \\ I 'I ; \�I I I { \ , I / / f 1111 / \ \ /I , / _ \ \ 1 \ \ \ \ \ \ \ \ \ \ \\ \ \ 1 I 'I, \ \\ \ \I 1 1 - \ I \ \ ' I I \ /I / - - - -- -- ^� \ \ \ 1 \ 1 1 \ \ \ \1111 \\ \ \ - _ - / \ / _ / \ / I / \ \ \ \ \ \ \ \ \ \ \ \ / ( \ �_/ \ / �/'r \ \ \ \ 1 1 \ \ \ \' \ 1111 I I \\ 1111 \\\r /^ \ \ / I I \ \I-- a \ -' I I // 1111 \ \ \ 1 \ \ \ \ \ \ 1111 \ \\ \\`\\ \ \I \ \ \\ / 1\ \ \\ \\\ \ \ \ - - / / / \ ' \ \ / \\ I \ I I \\ \ ® �® I / _ ` \ I 1 \ \ \ \ \ \ \ \\�\ \\ 1111 \ /, \ \ \\\ - _- / \ I � / / //- \ 1 \ \ \ 1111 \ \ I \ 1111 \ \ \ \ \ III / / -\\ \ \ 1 \ \ \ \\ \\ \ \\ \ \ \ \\ \I ` \ ` �� \ / �� - -,� I I I \ ) \ I \ \\ \ \\ \ \\ \ \ \ \\ \\ \ i \ \ \ ` \ \ \ \ \__- L--- - / I 1 \ \ \ \\ \ \ \( \ \\ \ \ I I I / / , 1 \ \ \ \\ \\ \ \ \ \ \ \ \ \\ \ \ \\\ \ \ ,\ \ / NNA STREET�R_I_W III 1 (, 1-- ----�, � \ � ' 1 \ \ \ \ \ \ \ \ / , I / ,,iii I �Iiil J I I 1 ` \ ` \\r \` \ \\ \ \\ \ \` \\ \\\\ \ \\\ \\ \\\ \� -_ / /,� \ j I I I ( / / ( 1 1 J / \ I 1 \ \ \ \ \ \ \ \S, \ \\ \\ \ \\ \ 1111\ \ \ \ \\ M\�\ \ \ \ -� II I I I I I \ \ \ \\ \\ \\\ 1111 1111 \ 14 I I I \` _ / 1111/ / ; \ \ ` - _ _ I I i I � I I \ \ \ \ \ \ 0 OF MH =5928 \ ® II I 7 \ \ \ \ \ \\ \\ \ \\ \\\ \� I \ / / / 1. Data D Drainage Area D Drainage Area D Drainage Area D Drainage Area D Drainage Area D Drainage Area D Drainage Area D Drainage Area / I \ \ \ \ \ \ \\ \\ \ \\ \ -' -- I I / I I / ® ®♦ I \ \ \ \\ \�\\ \\ \ \ _ / , I / 1111/ 0 \ _ i I►`I�i ® 11 I /® 1 / / \ \ ` \� \ \\ ` \�\ \ \\\ \ 1111 \ \ \ \ \ \ � \ / / 1111 - I I I I I I A �'I / I \\ \ \\ \\ \ \\ \ \ \\ \�\` \ \ \ t \ \\ \ \ \ \ \� I ` \ - - - 1 \ I I I I I f I / , % / 1 \ ` \ \� 11\11 \ \ \` \ \\ \\ \ \ \ \ \ `` I I , - _ �/ 1111 / \ ' I ' 1 / I 111 1 , / I 1 j f // / 1111 1 \\ \ \ \ \� \\`�� \`� \ \�� , \ J, \ \ , l 1 1 I \ - - - • g- -_ / ,- - \ I IIII \ - -�` � 1111 , / \ \ \ \ \ \ \\\ \\,\\ \\ \I \ • \ \ \ \ \ ` - /- / ` /- I -+ - IIlljI �' / / 1111 / / \ \ \ \ \ \ \ \ \ \rn \ \ \�� \ \ \ \ \\ \�\ \\ \ \� \ \�\_- // /�- \ / , \ \ \ \\\ \ \ \\ / I 1 Ilya , / ,' / 1111 / \\ \ \ \`\\ \`� ��`\ \.. \ \ \ \ \�� _�/ 1111/ / 1111 1111 ' / 1111 I I IIIIII / / 1111 / ,/ /�/ / �\ \ \ \ \\ \\ \�� \�� \�� \ \ \ , - -`- / //- / / \ LJ / i I I ( I I I I / / ' / / / - - \ \\ \ \ \ \\ \ ` \ \ \ \ \ - _ \ / / I I I I - �' / / / * 1111 / - 4 \ \ \ \ \\ 1111\ \\ �\ \ \ l �,\ \ \ \ _ _- - _ . ' _ 1111 I_W - I I I I -4- / // / / 11 I 1 \ \ \\ \\\ \ \ \\\\` \ \�� \ \\ \ \ \ �\ \ \ - -` - - - = / / / / \ \ I I I / / - 1111 - -- I I \ \\\ \ \ \ \\\\ \ \\\ \ \ \ \ - _ _ - - - / I / / / \ \\ \\ \\ I \ \ \ \ 1� '� �I I � / 0 ' - ---- I I \ \ \ \\\ \\ , \ / \ \ \ - -_ / - / I I 11 I / /* � - - , I \ \ \ \ \\ \ \ \\ \ \ \ \ \ \\ ,\ � \� \ \ - \ - / 2. Frequency -years 2 10 2 10 2 10 2 10 3. Rainfall, P (24 hour)- inches 3.7 5.6 3.7 5.6 3.7 5.6 3.7 5.6 4. Initial Abstraction, la- inches 0.900 0.900 0,566 0.566 1.504 1.504 0.515 0.515 5. Compute la /P 0.24 0.16 0.15 0.10 0.41 0.27 0.14 0.09 6. Unit peak discharge, Qu- csm /in 600 650 655 680 600 760 800 1000 7. Runoff, Qfrom Worksheet 2- inches 1.07 2.40 1.65 3.22 0.50 1.44 1.76 3.38 8. Pond and Swamp adjustment factor, Fp 1 1 1 1 1 1 1 1 9. Peak Discharge, Qp- cfs Routed through Routed through Routed through where Qp =Qu Am Q Fp SWIVlfacility SWMfacility 2.88 10.63 SWMfacility a U w 0 \ z 0 w r� ® / \ / Q � - i I -- / 11 / / - \\ \ \\ \ \ \ -- \ % " . \' . - / J , I ' 1 1 I . ! / / -- ' \\ � I , _ I �ll I I I // // / ,1111 1111' / # 1111 / _ -'� -1 `\ \\ \ \\\ \ \ \ \ \ \ \ \ \ \\ - -� �',\ \ \\ -� 1111 %�_ �' ' '` S % / / �0 - �/ /� /� / ry - /'___ -I I I I I / , / -- \\ \\� \\� �\ ' s \ / �// / 1111 '� / ,- i /j `/ Summa of Watersheds I I I I I I `I /� / / , , , / / -- -� \ \ \\ \\ \ \ \\\\ \\ ,\\ \ _ \ �I \ ' ' / - / / 4/ / 1111 / �, / /Y S I 1 t I I - -_t_ / / / ® / -1111 -, - -- - ` \ \ \\\ `� \ I i \� /- \\ -� � / - - / / / i /�/ /' tP I ,/ / _ / / 1111 / \ \ \ \ (`�. / ` / - - q \ � `I I / / /� ♦ I -' \ I I I III ' / 11 /' /' - - ` / , - _ - - \ \N I 111 1 \ \\ \ \\ -, I I `` \ ` - __ / - �'- 1111 / / / _ - 1111/ 1111 �, I ` } \ I I I I ` - / , , / / ) `I I (I III \ \ \ \\ \ I \ \ � � _ - / / 1111 1111% -- - _ -I / ♦ \ I /i I L / / / �4 I - _ -�- / I I 1 \ \ \ \\ 1 U \ \ S '- - - - / / ' / // / �- - / // Pre - Development 2 -Yr Flow 10 -Yr Flow Post - Development 2 -Yr Flow 10 -Yr Flow D.A. #1 28.35 ac. 9.77 13.92 D.A. #1 31.76 ac. 7.25 11.98 D.A. #2 15.35 ac. 2.88 10.63 D.A. #2 17.13 ac. 3.98 12.51 I / I \ \ \� _ _ f ! I _ _ ___ / / / 11/ ' / -_ \ / \ 1\ \ I I \ -` ` -___ - ' S - - - 1111 / / / / r- - - ® ll \ i I l \ /- I I I f n /' 1111 ' 1111 - _ l # I ! , , - _ \ ` ,I J I I III \ 1 / % 1111 i % _ ^ _ = 26.88 a c. _ 12.65 24.55 E = 26.62 a c. 11.23 24.49 _ - - - / / / / I I _ '�� 1111/ /1I / I I I I 1\ 1\\ 1 { 1' \ \ _ ___ _ .� 1111 • / / _ - J 1 ` I I ' ' ' / I / / - ___��.' / / 1 I I I 1 I \ /r =�__ _ - 11,11/ / / / _ - I / // / / - \ _ �_ - �� I > ( 1 II\ _ -/ 1111 D�1 ,/ / / I l� I I I !' .1111' 1 1I / -> '._ 1111 T / / - -_ I ) / -- _ \ \ I � ( 1 / I I I- / / / 1 /____--- / / I / / �- - -1111//% �/ -- - - -- / _ - - _ _ \ I ,�/ / I � 28 35 aC / / / I I - 1111 1111 / ! I I I \ TOP = s3.o = - - _ �_ _ / / / / _ _ _ �\ -' / _ _ r I , , _ _ \ 1 - - / 11 I _ / _ _ _ . /. / / \ / / \ N \ I / / , -1111 ,/ / / /.- - l \ ( -- -�i� -' / 11, / / / / _ _. / / _ i iii /� j / / -_- I I I \ / / / \� \ \ 1- \\ ,\ - I / /} I I / /i - ��._ / -/ CN�6 O / / �,' _ / 1111 ® I I 1 - -� ' - / -- / / 1111'/'/ I 11 `\__11 - - -_� '` _ - = :, %i % �/ / - - - _` ---- ` I I f 1 J`l 1111 / -� 1 _ _ __ _ } / _ _ / / -- r/ \� I �\ \ -�- S I -E `- -� I --_ _- _ , -TC= O.3o hrs,' 1111 '� �� - - - -- -1111 / �� / I 1 \ �� -��' / / �'' /'/ I /! _ _ - --- I - - \ / // "- - ' -'f '� i � - � � �/ �\ / 1111 g?p' - - - - - �J I I J I 1111/ / j ( / ,' w �� , I / _ -� ___ / / / / _ /� / / /�I)1 % �// 1111 / 1111 , = =\_` / /� = J -= �_ - ' / / __ _ - - -- `-- -' I l J / / ' / ~ \ \ \ I // / / \ -- / /, / � /if r- / - /// / ' - _ _- Z- -_\ -- _ %/ 1111_ - \\ / _ -_� // / , , �� \ \ \ I - -� / / / / / / ! I � � f - , / / �\ -11 / =% _ / -�\ \ / / __ \ _ I I / . 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I I I I l ! II \� - 1 \ kti - I I I I I \ \ \ I I I 1 1 \ 1 \ \ \ \ \ - - - -- / I __ \ 1111 / I ♦ � \ _ 7 \ � 1 I 1 \ \ \_, l \ / _ I ( /I I \ \ '! IY I I I J l I I ` ♦ \ - -" - -- 1111 ' I ` \ I 1 1 , I 111 1 (I 1 \ `\ \ \ \ \ \ \ \ 1 \ I r - `�\ - I I I \ ♦ / I 1 I / \\ \` \\ ' 1} 1N,''\ \`\ It I \ \ \ \\ \ \ , 1111 ! I I II /I r I 11 I ( I l l \ ' \ - - - -- 1111 / I 1 , 111 I 1111 - \ \ \ \ I t , I , , 1 1 \ \ 1 1 I ! \ \ \ \\ `\\ \\ \ _ - �/ I , / \ J I , /� \\ / - I I I I I I I \ \ 1 1 \ \ \ \ \ \ \ ! I \ I ! I I ! I / I / ♦ \ 1 \ ( IN FEET ) / 1 1 1 \ a \ \ / I 1 \ \ 1 I ! \ \ \ \ / I I I / p 1 , f( I I t \ ! 1 1 \ 1 l \ \ \ \\ \ - l i l I - \\ f I \ 1 1 1 \ /I CO I I / \ t�1� I / / I '� r 1 6 � 1 I \ \ \ \ \ - - 1111 / l \ 1 I \ \ \ \ \ \ / / I \ 1 I I \ 1 I \ I 1 inch = 80 ft / 1! J I 1 \ \ / I I I 1 1 \\ \ f1 I I ! 1 I / \ \ \ / ! I 1 Il 1 1 \ \\ \\ \ I (( \ \ \ - f ( ( \ \ 1 1 I II 1 \ I 1 / \ ' / / ! / f II /� \ \ \ 1 \ / / I I 1 1 111 1 \ \ \ \ \1111 I I I I i \ \\ \ \ \\ \ \ \ \ \ \ 1 1 � �-�� 1 ( � \ 1 1 I � v v 1 \ \ \ r \ -- /,- / / / 1 I I \ \ \ \ / I I I 1 I \ \ \ \ _--- _ - - - -_ / 1 I \ \ \ \ 1 7 I I I I \ I I ( l \--. / III I 1 \ ' III I (I 1 \ 1 I \ \ \ \ \ `'- _ � ! \ \_/ I \ 1 1 \ �I I \ _ / 1\1 \ I \ \ \ \ \ \ \ \ / I / \ \ \-/ I \ \ \ \ \ / t \ ' ! I ( / \_` \ 1 1 1 I 1 \ \ \ \ / I I ! \ \ \\ / 1 \ 1 \ 1 \ \ 1 1\ \\ \ \ I I ) / / 111' \ \ \\ \ 0 /I I I II\\ \1111 IIII \ \ \ \ \ \ \ - ! \ J \ 1 \ \ \ \\ i - !I ! I D.A. #2 \I \ 1111 r 1 11 1 \ \\I } / \ \\ \\ \\ \ / r /1 II I \ \ I\ \ \ \ I I \ , /� \ \ //, � / \�\ 1111 ! 1111 11 \ 11 \ / / ! / I I I I I II \1 11 II 1 1 I \ \\ \ \\ \\ \\ \\ \ \ \ \\ \ - -- - - 600 - / // I r / I I 1 I l \ \ \ x -J 11 \ \ \ 1 \ \ \ \ 1 \/ \ ,I / \ \\ -' ,/ / III 6.30,acl 1 I I \ / / / I I I I I I 1 I 111/111/ JI \ \ \ \ \ \ \ \ \ \ _ / I I I r /- \\ I I I I v Y I 1 I _ \ V A 1111 - / // /f / I V \ I I v\ v 1 v i I, \ \ - - -- -\ ! 111 I 1 / 1 I 1 II 11 t I \1 \ \ \ \ \ \ \\ . - -- \ I 1 1 1 \ \ , \ 1 _1 /\ / t / / / / 1 N=S�\1 1 I 1 \ V / / / / !, / I I , I I \ \ \ \ \ \ �_ \ / x 1 1 t 1\\, / / \ 1 \ '� I I 1 ) \`\ \ \ \ \ 1111 \ / � I \ \ U.S. Department of Agriculture \ / 1 \ �''' ' / ' �% �''/ -\ 1 1 1 - ' / I I I I I 111 / \ \ \ \ \ ( \ \ \ FL- ENG -21A / 1 \ / / \ 1 I / / 1 / ( I I 1 ( I I 1 \\ \ \ \\ \ \\ �/ \\ \ \ \_ -/ 1111 / I I I /! /- \� `\ \ \ 1 \ \, / / ! I I I I / \ \ \ \ \ \ \ I �C= 0.18 hr5 '♦/ / , I I I I I 1 I 1 \ \ \ \ - \ / / / I I I / \ \ \\ \ \ \ i \ / ! /!r I I ' /S III1111III! 1 \ 1 \ / / , \ \ \ ,, / // ! / l l ! \ 1 \ \ � / l ! l I I `I I I I (1 \ \ \ \ \ \ \ \ -' 11' \ ` / / J I ' I 1 \ \ _1 \\ \ Natural Resources Conservation Service 06/04 \ \ \ _ - / / ! / / /� \ \ 1 _ - _ _ , / I III I 1 \ \ \ \ \ \ \ / / / / I 1 \ \ \ \ \ / / I / \ \ \\ \ / / / 1 I I III I I t \ \ \ \ \ \ \ \ \ \ - -' 1111 -\ \ \ ,' ,' / I \ 1 ( \ / 1111 \ \ \\\ \ \ \ \ \ 11' / // / /l 1 // \ \ / / ! I ! l \I I I 1I 1 \ \ -- / / \ V A v', �- � V A V A v -�•/ , / / / I I I III I / I\ V A\ v v v v / v v v / I v v \ A / l / / \ \ \ - i / / / / l I l I I ( I I 1 / I \\ \ \ \ \ \ \ \ \ \ ' 1111 /' / / I \ 1 / \ \ \ TR 55 Worksheet 2: Runoff Curve Number and Runoff \ \ \ \\ \ / // , l l / / / J / � \ \ \ \ \ \ \ � / / l / l / I ( l ! I, l I I III I / / I \ \ \ \ \ \ \ \ \ , / I \ ( \ \ \ x \\ \ \ \ \ \ / j / \ / I / fI I I \ \\ \ \ \ \ f s �_ I l / \ \ / / / / l l \ \ \ \ / 1111 / /I / lI / l I (! I I I I I 1 � \ \ \ \ \ 9 \ - / / / � I I 1111 \ \ \ \` \ \ / / ! ! l /\ \ \ \ \ / ,, , / J I 1 /1 I ICI 1111 I I I \I\ \ \ V \ / -'\ o \ / / / 1 I / l \ \ Project: Westlake Hills Designed By: KKW, PE Date: 5/14/2013 \ � \ \\ \ \ 11 / / / / / ! \ \ - / \ 1 \ \ \ \ \ \ \ \ \ / 11 , / / I 1 \ \ \ �- ' / /! ! ! l \ \ \ 1 - / I / ! l III I I I I I I I I I I'\ \ \ \ \ \ \ \ \ -' ,' \ \ \ \ - ' / 11 / / I / \ 1 \ 1 x U.S. De artment of A riculture FL- ENG -21A \ \ / / / \ \ \ / / ! / / I I I I It \ \ \ \ \- / / Location: Crozet alon Future Connector Road Checked B : KKW, PE Date: 5/14/2013 p g \ \\ / / I l ! \ \ \ _ -- / I l 1 I I I I I I I ( I \ \ \ \ \ \ \ \ \ ,/ 11/ 11 %! / / ! \ 1 I \ \ g Y \ / l/ I \ / / I I I 11 \ � \ \ / Natural Resources Conservation Service 06/04 \\ \ / / / ! I / \ \\ \ \ 1111 11 i ® / / / ! / I 1 I I I I I I I \\ ` \ \ ^ \ ` \ � - _- 1111 ' ' - \ \ 11 I \ , / 1111/ / / / \ \ / / / I I 1I I ) 11 \ \ \ \ \ / \ \ / / , - / / / / / / / \ \ / / / I I I I I / /II \ \ \ \_- , -\ \ \ - - ', / / / \ I I \ \ / / / \\ -- - / I I 1 1 \ \ \ \ \ \ _ - i y I / \ Check One: Present X Developed X \ \ \ - - / / / ! ' \ 1 \ \ _ -' / / ,' I / ( (I I i� l 1 I I I 1 \ \ (1t \ \ \ \ \ \ \ / \ < - _ - _ - i . _ - % ' / i i \ \ \ \ TR 55 Worksheet 3: Time of Concentration T orTravel Time T \ r / / % / / / \ \\ I 1 I I I I } \11 \ \ \\ \ \ \ \ -- / \ \ ` \\ _ -- - _ -' / _ . / / \ 1 \ - ( c) (t) \ / / / \ / / % I I I III ( I \ ,\ - - - - . - 1 1. Runoff curve Number (CN) ! l l / / \ \ _- - - l r I I 1 I I I I \\ \ \ \ /- � _ - - -- ' ,-- - _ - 1 1 _ \ems \_ / 1 I / I / / \\ -' /' ,� I 1 1 1 I I I I I I ( / 11 I \ \ \ \ \ \� -/ \ \ \ 1 � /_ �' 1111 1 I _ /�� \\ /- . I I I ! I III \ \ \ - -. \ \ -/ _- - / - - /I \ \ \ / Cover description Drainage Soil name and CN (weighted) _ (Cover type, treatment, and hydrologic condition; Area Product of Calculated Area hydrologic group CN total product/ Description (Appendix A) percent impervious; unconnected/ connected (Acres) CN x Area 'S' Value impervious area ratio) total area D.A #1 Impervious Areas 98 7.10 695.8 (Present) B Woods in Good Condition 55 6.10 335.5 69.0 4.50 Lawns in Good Condition (75 %+ Groundcover) 61 15.15 924.2 D.A. #1 Impervious Areas 98 14.77 1447.5 (Developed) B Woods in Good Condition 55 1.36 74.8 77.9 2.83 Lawns in Good Condition (75 %+ Groundcover) 61 15.63 953.4 D.A #2 Impervious Areas 98 0.00 0.0 (Present) B Woods in Good Condition 55 4.06 223.3 57.1 7.52 Lawns in Good Condition (75 %+ Groundcover) 61 2.14 130.5 D.A. #2 Impervious Areas 98 3.34 327.3 (Developed) B Woods in Good Condition 55 0.00 0.0 79.5 2.57 Lawns in Good Condition (75 %+ Groundcover) 61 3.33 203.1 Project: Westlake Hills Designed By: KKW, PE Date: 5/14/2013 \`_ -- / / 1 ! ! /J \_, \ - - -' __ -' gee / I t 1 �I I II ( ( I ( 1111 \`\ \ \ \ \\ \`�- 1`1`11 sao - -~ - - - _ =_ ; \ 1 \\ \\ \"' \ ___ - -' / Location: Crozet along Future Connector Road Checked By: KKW, PE Date: 5 14 2013 i / / / / _ - - -`' - /� �' I III I I ( j I I I / tl \ \ \ \\\ \\ �- - -' \ \ -- � ; __ _ -� \ \ \\ \ `--.- /' / l \ _ / / I / / !l - _ - J / ____ - - -' / '''� 111\!' I I 1 I I / 11 \ \ \\ \ \ ^\ �, _ - _ '- - - - \ \\ \- / / 1 / �L"'` /. -- - -- \1111 / ' I ' ( 1 III \1\ \ \ \ \\ \ -1111 \\ r 1111_/ __- / /�\ \ \ /� J / - /l , l I I I J \` \ - - - - - - \ \ \\ \\ / Check One: Present X Developed X `- \t ! / / ! % ! \____ -- / / I 1 \\ \ \\ \-� , \ -- 70 _ -__ -- - - "`- - \ ` l- \ / / - / / I I ( II `\\ \ \ -_ 5 1 \ �/ 1111 / !/ / / / /! !�_ \`___ \`- -- _ // ' /! /I # I I I I 1 1111\ \ \ \� ��/ \_- - -_ - - ' _- - - - -- 1 \\ \ \\ - -_ -' 1111 Check One: Tc X Tt Through subarea n/a I l / _ _ -- 11 / /! l '�' I I \ \ \ \ _ \ -_ _, _ _ _ - ; - _ _ _ - ! / / / / /�_ _ ! l ! # a I I 1 \\ \\ \ ` - \ \\ - 1111, 1111 - '' ' I I I'/'/ 1111 \\� \\ 1111' 1111 I !'IIII l! l I I 1 I I )1\ \\ \\ \` - -'\ \_- _ -1111 _ /_� �_ __�_' -- \ \- \ \_-- 1111 \� - / l l / l ' 1111 �, - --` \ \\ 1111 1111 / l l \1 / 1 1 \ \\\ \� _ " ' - -' -� / - -- - -__- --__� \ ` / / / _ \ \ / 1111 / I T I 1 \\ - `�- - - ___ ` ! ! / / / / / \ \ \_'- / / / //! l l l ,I ll ' I / t\ \\ `\ \ 560 _ - \ 11 11 Se mentlD: - - -- -'� / / % 1 / !/ / // \\ \ \ /, 11,11/ / 4 / /\/ / \1111 - __ _ �`'---- ___�_= __1111'/'' g - __- _ S / / / / 11I / - --- \ \ \` -. /, / // // / I // / / // / / \\ �� \\ - - -\ - ,__' / /'� -1111 _ -' \\ _ - - -- 1111,/ Sheet Flow: (Applicable to T� only) -sce- - / r r / / / ,' / - -\ `\ ` \ / / /� / ! / / / ' I /� 1111 �, �� / /J / 111 \ \ _ `- - - _ - - / 1111 / _ - IrY J / / I I b I , / \ \ \ - __ f I / / / / / / - •11 ,` 11 / I 1 \ \ - / .' \ Dense Grass Dense Grass Dense Grass Dense Grass / ) / / / / - \ \ \ \ 11 , / / / ' / ' , 11I ,, / ) \ \ \ - - - -' 1111 -' _ `- _- / ' / 1 Surface description (Table 3 -1) - _ - , _ _ ,' ' \\ `\ \\ - ' ' \ 1111 / / 1 / ! _- / / / / / / / / ///i/ .. :•: �' / \ \ \_ _ _ .' / �o -o - -- 1111 - - - -� 1 / / \\ \ / / 11 / / / /�/ ` 1111 \ \ -- -- �gi3 ��o�o - -- \o !� '�� / 2 Manning s roughness coeff., n (Table 3 -1 0.24 0.24 0.24 0.24 �� \__. 1 / / I /- \ \ \\ \ / -/ // // / j// �, / / /� /� ,:.•...:.. ....11 ) \\ 9_- �- � , � , 3 Flow length, L (total L < 100) (ft) 100 100 100 100 ` � \t` _ I j \ - , , , / / / %/ / ; �_ % -� , / \ _ 11 I 1 / 1 \ \ \ \ _ - / / / / ' / / 1111 / '/ ' / �` / ' ' \ \ �' --e _ e .e / / \ \ \ / / // // .1 M.. / ,11 / � - \ '�/ ' 1111 1111 �:. •. ... / 4 Two -year 24 -hour rainfall, P2 (in.) 3.7 3.7 3.7 3.7 - . '��1 ■ 1( \\ - - -�11 Z / 11//. / ,11 \ 1111 / 5 Land slope, s (ft /ft) 0.02 0.02 0.06 0.06 _ °� 4 _ _ _ - �1 I I j \ \ - _ -1111 1111 %1111 i ' :PO f �D: �' /- _\ _ _ 1111 �8 \ \ . / / i/ / 11 , . \ / / �, \'_ _ - - -' / I / I / ® \ --- -- 1111/// /- .:� . / \ '\ / / 6 ComputeTt= [0.007(n *L)os] / Pz s S .4 0.22 0.22 0.14 0.14 - \�\ v:` - - - -' / / \ ' - -- W /��i /;, \\\ / / -' \ �'�. \ "Y' 1111 1111 / / / Shallow Concentrated Flow: -- ,�` ` -\ x i I 1 /'� i/ �� - \ \ \\ \ - - \__ -- -11/'' "4 -\ \ ._/ I I __ . - 1111 / - / - 7 Surface description (paved or unpaved) Unpaved Unpaved Unpaved Unpaved `\ ` �\ \ \ 1 I I -_ \ J _ 1'_, ;' / 11 _ - - �- - - _ _ _ _ _ _ _ _ 8 Flow Length, L (ft) 486 486 680 709 - - ; _ `, \ \\ \ \\ _ - - / / I J //1 - - �- - 1111 /' �� ; • / / H - _ \ \, �WSA 1 c �E E S -- ---- -- - - _ - _ - - - - - - 9 Watercourse slo e s ft ft 0.038 0.038 0.138 0.082 se_\ _ \\ \I I - 1111 � / I ' 1111 ' / / / �' / �� I- "H= ` -F� M" s, ----- S p i ( / ) �- \',, 1111\`,- - -- / �i i /J r\ ' / / 1111 ! / / S 1111/' / _ \\ JI - CZI- MH -8�== __-�_ S 10 Average velocity, V (Figure 3 -1) (ft /s) 5.3 5.3 5.75 5 _ \ -,\ \ - % / - - - - - - - �I - \', \\\ - -! -- - I , // ,/ / / -Ft /11 / /i \ `� _ - - - - -- CZI -MH -83 - 11 Tt = L / 3600 *V 0.03 0.03 0.04 0.04 _. a _e _-8 --� -e- -e- \ �� _ _ = - - - - -_I- -' 1111 I / �cP SEw/ / / ' , mP OF \ _ _ - _ - _ `� - _ - - - \ _4" _ _ = g- Ste- 6-- C�� _ _ 11 11 / / �/ RwSP - - _ -' ,' ELE✓.�549.71' - \ - - - \ \ ` - _ _ - - _ - Channel Flow: o LL. o N/A _ ' -- - - - -- 5 - - \ -- _ _- `` _ - -` ` JJ t- _ _ --' _ ---_ - _ 12 Cross sectional flow area, a (ft2) o o -4 o a3: / H/ //11'� . -' y - �\ / \\ `� H / S _ CZI ,MH -86 -/' ,' ,' 1 , \'\ ,_General construction notes for Stormwater Mana ement lans _ _ c v > E �; / / SEwEa / / , Pt�u -5 4;45 _ -'' /' /'- , 1\- \\ 1---'1. All dams and constructed fill to be within 95% of maximum dry density - 13 Wetted perimeter, PW (ft) = � M N / 5 c, / ___ ! /_�/ ,' - \ `' -1 and /_ of optimum moisture content. All fill material to be approved by 14 Hydraulic radius, r = a /PH, (ft) > "- .E O /,. RwSP/ / - _ I / / I' `) \ 11' 2. Runoff \ �, M � M cu o / / / \- \\ \ (\ 111 // 1 II I \ /11 a geotechnical engineer. A geotechnical engineer is to be present during . 15 Channel (I e s (ft /ft) E / S'` / ' D.A #1 D.A. #1 D.A #2 D.A. #2 (Present) (Developed) (Present) (Developed) 2 -Year Storm 10 -Year Storm Drainage Area Description Frequency -years 2 10 n/a Rainfall, P (24 hour)- inches 3.7 5.6 n/a Runoff, Q- inches 1.07 2.40 D.A #1(Present) Runoff, Q- inches 1.65 3.22 D.A. #1(Developed) Runoff, Q- inches 0.50 1.44 D.A #2(Present) Runoff, Q- inches 1.76 3.38 D.A. #2(Developed) p I E m E � - / I I / / \ construction of dams. s 16 Manning's Roughness Coeff, n Z. o 'Z o a� r - - - j` I l !! / / I '� / ,, J/`�- _ - G I /'2. Pipe and riser joints are to be watertight within stormwater 17 V= [ 1.49 r2 /ss .s ] / n fa � a) L --- -- S --�� / _ _ - _ - , / / J -11 ' - - - F ____ - -s _-� - management facilities. _c 18 Flow length, L (ft) - -- - -- -- 11 \- ; 3• For temporary sediment traps or basins which are to be converted to 19 Tt =L /3600 *V 0.05 0.05 _ - - -____ /� 1111 / / / _ _ k \ 11 / , -- permanent stormwater management facilities; conversion is not to take 20 Watershed orsubarea T�orTt _ 4• - lace until the site is stabilize nd _ __ 11 a nd 19) 0.30 0.30 0.18 0.18 - - - - _ - - �� - "' p ' a �' (Add Tt in steps 6, __ _ �, _ _ _\ \,permission has been obtained from the County erosion control inspector. \ \ ` N M d' 1 N N LJ..1 J W Q U 1 W Q 0 N Z a D Q O oC w U') Q 2 a J J 2 W Y H U) W Z W 0 ^ a L.L.. � a O � c a J L 0 W -� W� L z W �� w �, w z art � z L.L. ° w a zaz � J L J o ,� m o o L � 3 O O V Z �° o � o a; W �� •L O 3 d W �' � L � a I r x V � o o � T •11.11 Z� E o 0 3 L c.� v� L z c rr Y w a w � wZ z °- w U z� J C 0 � L o � N L d W o Oa � o � a� > .n U O X � � V c � o w o J � O 0 JOB NO. � � o� ��zo�z •� 0 SCALE ° •� c � o � SHEET NO. a o 25 °' �o a U w 0 \ z 0 w r� ® / \ / Q � - i I -- / 11 / / - \\ \ \\ \ \ \ -- \ % " . \' . - / J , I ' 1 1 I . ! / / -- ' \\ � I , _ I �ll I I I // // / ,1111 1111' / # 1111 / _ -'� -1 `\ \\ \ \\\ \ \ \ \ \ \ \ \ \ \\ - -� �',\ \ \\ -� 1111 %�_ �' ' '` S % / / �0 - �/ /� /� / ry - /'___ -I I I I I / , / -- \\ \\� \\� �\ ' s \ / �// / 1111 '� / ,- i /j `/ Summa of Watersheds I I I I I I `I /� / / , , , / / -- -� \ \ \\ \\ \ \ \\\\ \\ ,\\ \ _ \ �I \ ' ' / - / / 4/ / 1111 / �, / /Y S I 1 t I I - -_t_ / / / ® / -1111 -, - -- - ` \ \ \\\ `� \ I i \� /- \\ -� � / - - / / / i /�/ /' tP I ,/ / _ / / 1111 / \ \ \ \ (`�. / ` / - - q \ � `I I / / /� ♦ I -' \ I I I III ' / 11 /' /' - - ` / , - _ - - \ \N I 111 1 \ \\ \ \\ -, I I `` \ ` - __ / - �'- 1111 / / / _ - 1111/ 1111 �, I ` } \ I I I I ` - / , , / / ) `I I (I III \ \ \ \\ \ I \ \ � � _ - / / 1111 1111% -- - _ -I / ♦ \ I /i I L / / / �4 I - _ -�- / I I 1 \ \ \ \\ 1 U \ \ S '- - - - / / ' / // / �- - / // Pre - Development 2 -Yr Flow 10 -Yr Flow Post - Development 2 -Yr Flow 10 -Yr Flow D.A. #1 28.35 ac. 9.77 13.92 D.A. #1 31.76 ac. 7.25 11.98 D.A. #2 15.35 ac. 2.88 10.63 D.A. #2 17.13 ac. 3.98 12.51 I / I \ \ \� _ _ f ! I _ _ ___ / / / 11/ ' / -_ \ / \ 1\ \ I I \ -` ` -___ - ' S - - - 1111 / / / / r- - - ® ll \ i I l \ /- I I I f n /' 1111 ' 1111 - _ l # I ! , , - _ \ ` ,I J I I III \ 1 / % 1111 i % _ ^ _ = 26.88 a c. _ 12.65 24.55 E = 26.62 a c. 11.23 24.49 _ - - - / / / / I I _ '�� 1111/ /1I / I I I I 1\ 1\\ 1 { 1' \ \ _ ___ _ .� 1111 • / / _ - J 1 ` I I ' ' ' / I / / - ___��.' / / 1 I I I 1 I \ /r =�__ _ - 11,11/ / / / _ - I / // / / - \ _ �_ - �� I > ( 1 II\ _ -/ 1111 D�1 ,/ / / I l� I I I !' .1111' 1 1I / -> '._ 1111 T / / - -_ I ) / -- _ \ \ I � ( 1 / I I I- / / / 1 /____--- / / I / / �- - -1111//% �/ -- - - -- / _ - - _ _ \ I ,�/ / I � 28 35 aC / / / I I - 1111 1111 / ! 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I I I I I {11 1Uitl / / \ \ \ \\ ` \ \ \\ I \ / \ / I I / / ( I I / I - - J '� i a► / / I / / 1111 -� \ \� \ `\ I I l I j 1 1 I / / /` --- \ \ \\ \ _ \ \ -- 1111 I / ' I I \ t I � `, \�' / / / / / / \\ \\ \\ I 1 I I II 1111 / __ \ \ \ \ \ \ ` \\ \\ - -- -- / / / / / / / \ \ !! !/ \ / 1 S \ �s ____ +� 650 - / 1111 / / \ \ \� \\ J I I J 1 I I � \ \ \ \ \ \ \��`\ \ \ \ \ / 1 I / '- \ ) 1 -- \ 1 . �-� �- � / / / / \ / ! I I 111 Il \ 1 ( \ \ \ \ \ \ \ \ \ \ � 1111 f / -\ ,� / , 1 / / / \ ' / / ! / \ \ \ \ 1 - - - - „� / / - / / l / / � ` \ \ \\ I I 1 I ! 11 1 1111 \ \ 1 1 11 \ \ \ \N \ \ \ \ \ ---- - - - - -- --- / r / / / - \ _/ / / / ( \ �� Is \ / / / l 1 I I / / \ \ \ f I I 1 \ \ \ / I l � \__ / l 1 / / / /,, / / / \� \�\ \ \ \ \ - / \ f 1 I 11\ \ 1 1 \ \ - \ 1111 I \ {♦ � _____- GRAPHIC SCALE ,/ , / I I 1 I I / / \\ �\ A I 1 I 1 �I � � \\ \ 1 \ \ \ \ \ \ \ � / ! � r / .\ `\`\ / ! / ! \ I I 1 1 \ \ t 1 \ \ \ \ \ / / / / /� / / / -\ \ \ 1 \ \ ! b _ / / l 1 l / -\ \ \ \\ \ \� II I \ 1 1111\ \ I I 1 \ \ \ \ `\\ \ \ \ \ \ \ \ 1 1111 ,� I I I 1 / ! 1 \\ \\\_ _/ , / l r / \ / / \ 1 I i 1 1 1 \ I - - _- ---- - - - -�\ 80 0 40 80 160 320 - - - -_ ,' / I I 1 I } I / / / \\ \ \ \ \ 1 I 1 \ \ \ 1\ 1 1 I1\ \ 1 I I 1 1 \ \\ \\ \ \ \ \ \\ \ \ o - - / / / l - _ \ -- _ / / l / 11 \\ \ / I I \ \ \ 1 \\ 1 I \ \ \ \ \ 61 -' / I I / \ \ / \ / / \ \ \ \ 1 1 \\ 1 1 \ \ ' -� I I I ! \ \ ' ! 1 �\ \ \ I 1 ' , � \ / 1 / \\ \ \ II \ \ 1 N,V \\\ 1 I I I \ \ �, \ \\ \\ \ / ! I I I I l ! II \� - 1 \ kti - I I I I I \ \ \ I I I 1 1 \ 1 \ \ \ \ \ - - - -- / I __ \ 1111 / I ♦ � \ _ 7 \ � 1 I 1 \ \ \_, l \ / _ I ( /I I \ \ '! IY I I I J l I I ` ♦ \ - -" - -- 1111 ' I ` \ I 1 1 , I 111 1 (I 1 \ `\ \ \ \ \ \ \ \ 1 \ I r - `�\ - I I I \ ♦ / I 1 I / \\ \` \\ ' 1} 1N,''\ \`\ It I \ \ \ \\ \ \ , 1111 ! I I II /I r I 11 I ( I l l \ ' \ - - - -- 1111 / I 1 , 111 I 1111 - \ \ \ \ I t , I , , 1 1 \ \ 1 1 I ! \ \ \ \\ `\\ \\ \ _ - �/ I , / \ J I , /� \\ / - I I I I I I I \ \ 1 1 \ \ \ \ \ \ \ ! I \ I ! I I ! I / I / ♦ \ 1 \ ( IN FEET ) / 1 1 1 \ a \ \ / I 1 \ \ 1 I ! \ \ \ \ / I I I / p 1 , f( I I t \ ! 1 1 \ 1 l \ \ \ \\ \ - l i l I - \\ f I \ 1 1 1 \ /I CO I I / \ t�1� I / / I '� r 1 6 � 1 I \ \ \ \ \ - - 1111 / l \ 1 I \ \ \ \ \ \ / / I \ 1 I I \ 1 I \ I 1 inch = 80 ft / 1! J I 1 \ \ / I I I 1 1 \\ \ f1 I I ! 1 I / \ \ \ / ! I 1 Il 1 1 \ \\ \\ \ I (( \ \ \ - f ( ( \ \ 1 1 I II 1 \ I 1 / \ ' / / ! / f II /� \ \ \ 1 \ / / I I 1 1 111 1 \ \ \ \ \1111 I I I I i \ \\ \ \ \\ \ \ \ \ \ \ 1 1 � �-�� 1 ( � \ 1 1 I � v v 1 \ \ \ r \ -- /,- / / / 1 I I \ \ \ \ / I I I 1 I \ \ \ \ _--- _ - - - -_ / 1 I \ \ \ \ 1 7 I I I I \ I I ( l \--. / III I 1 \ ' III I (I 1 \ 1 I \ \ \ \ \ `'- _ � ! \ \_/ I \ 1 1 \ �I I \ _ / 1\1 \ I \ \ \ \ \ \ \ \ / I / \ \ \-/ I \ \ \ \ \ / t \ ' ! I ( / \_` \ 1 1 1 I 1 \ \ \ \ / I I ! \ \ \\ / 1 \ 1 \ 1 \ \ 1 1\ \\ \ \ I I ) / / 111' \ \ \\ \ 0 /I I I II\\ \1111 IIII \ \ \ \ \ \ \ - ! \ J \ 1 \ \ \ \\ i - !I ! I D.A. #2 \I \ 1111 r 1 11 1 \ \\I } / \ \\ \\ \\ \ / r /1 II I \ \ I\ \ \ \ I I \ , /� \ \ //, � / \�\ 1111 ! 1111 11 \ 11 \ / / ! / I I I I I II \1 11 II 1 1 I \ \\ \ \\ \\ \\ \\ \ \ \ \\ \ - -- - - 600 - / // I r / I I 1 I l \ \ \ x -J 11 \ \ \ 1 \ \ \ \ 1 \/ \ ,I / \ \\ -' ,/ / III 6.30,acl 1 I I \ / / / I I I I I I 1 I 111/111/ JI \ \ \ \ \ \ \ \ \ \ _ / I I I r /- \\ I I I I v Y I 1 I _ \ V A 1111 - / // /f / I V \ I I v\ v 1 v i I, \ \ - - -- -\ ! 111 I 1 / 1 I 1 II 11 t I \1 \ \ \ \ \ \ \\ . - -- \ I 1 1 1 \ \ , \ 1 _1 /\ / t / / / / 1 N=S�\1 1 I 1 \ V / / / / !, / I I , I I \ \ \ \ \ \ �_ \ / x 1 1 t 1\\, / / \ 1 \ '� I I 1 ) \`\ \ \ \ \ 1111 \ / � I \ \ U.S. Department of Agriculture \ / 1 \ �''' ' / ' �% �''/ -\ 1 1 1 - ' / I I I I I 111 / \ \ \ \ \ ( \ \ \ FL- ENG -21A / 1 \ / / \ 1 I / / 1 / ( I I 1 ( I I 1 \\ \ \ \\ \ \\ �/ \\ \ \ \_ -/ 1111 / I I I /! /- \� `\ \ \ 1 \ \, / / ! I I I I / \ \ \ \ \ \ \ I �C= 0.18 hr5 '♦/ / , I I I I I 1 I 1 \ \ \ \ - \ / / / I I I / \ \ \\ \ \ \ i \ / ! /!r I I ' /S III1111III! 1 \ 1 \ / / , \ \ \ ,, / // ! / l l ! \ 1 \ \ � / l ! l I I `I I I I (1 \ \ \ \ \ \ \ \ -' 11' \ ` / / J I ' I 1 \ \ _1 \\ \ Natural Resources Conservation Service 06/04 \ \ \ _ - / / ! / / /� \ \ 1 _ - _ _ , / I III I 1 \ \ \ \ \ \ \ / / / / I 1 \ \ \ \ \ / / I / \ \ \\ \ / / / 1 I I III I I t \ \ \ \ \ \ \ \ \ \ - -' 1111 -\ \ \ ,' ,' / I \ 1 ( \ / 1111 \ \ \\\ \ \ \ \ \ 11' / // / /l 1 // \ \ / / ! I ! l \I I I 1I 1 \ \ -- / / \ V A v', �- � V A V A v -�•/ , / / / I I I III I / I\ V A\ v v v v / v v v / I v v \ A / l / / \ \ \ - i / / / / l I l I I ( I I 1 / I \\ \ \ \ \ \ \ \ \ \ ' 1111 /' / / I \ 1 / \ \ \ TR 55 Worksheet 2: Runoff Curve Number and Runoff \ \ \ \\ \ / // , l l / / / J / � \ \ \ \ \ \ \ � / / l / l / I ( l ! I, l I I III I / / I \ \ \ \ \ \ \ \ \ , / I \ ( \ \ \ x \\ \ \ \ \ \ / j / \ / I / fI I I \ \\ \ \ \ \ f s �_ I l / \ \ / / / / l l \ \ \ \ / 1111 / /I / lI / l I (! I I I I I 1 � \ \ \ \ \ 9 \ - / / / � I I 1111 \ \ \ \` \ \ / / ! ! l /\ \ \ \ \ / ,, , / J I 1 /1 I ICI 1111 I I I \I\ \ \ V \ / -'\ o \ / / / 1 I / l \ \ Project: Westlake Hills Designed By: KKW, PE Date: 5/14/2013 \ � \ \\ \ \ 11 / / / / / ! \ \ - / \ 1 \ \ \ \ \ \ \ \ \ / 11 , / / I 1 \ \ \ �- ' / /! ! ! l \ \ \ 1 - / I / ! l III I I I I I I I I I I'\ \ \ \ \ \ \ \ \ -' ,' \ \ \ \ - ' / 11 / / I / \ 1 \ 1 x U.S. De artment of A riculture FL- ENG -21A \ \ / / / \ \ \ / / ! / / I I I I It \ \ \ \ \- / / Location: Crozet alon Future Connector Road Checked B : KKW, PE Date: 5/14/2013 p g \ \\ / / I l ! \ \ \ _ -- / I l 1 I I I I I I I ( I \ \ \ \ \ \ \ \ \ ,/ 11/ 11 %! / / ! \ 1 I \ \ g Y \ / l/ I \ / / I I I 11 \ � \ \ / Natural Resources Conservation Service 06/04 \\ \ / / / ! I / \ \\ \ \ 1111 11 i ® / / / ! / I 1 I I I I I I I \\ ` \ \ ^ \ ` \ � - _- 1111 ' ' - \ \ 11 I \ , / 1111/ / / / \ \ / / / I I 1I I ) 11 \ \ \ \ \ / \ \ / / , - / / / / / / / \ \ / / / I I I I I / /II \ \ \ \_- , -\ \ \ - - ', / / / \ I I \ \ / / / \\ -- - / I I 1 1 \ \ \ \ \ \ _ - i y I / \ Check One: Present X Developed X \ \ \ - - / / / ! ' \ 1 \ \ _ -' / / ,' I / ( (I I i� l 1 I I I 1 \ \ (1t \ \ \ \ \ \ \ / \ < - _ - _ - i . _ - % ' / i i \ \ \ \ TR 55 Worksheet 3: Time of Concentration T orTravel Time T \ r / / % / / / \ \\ I 1 I I I I } \11 \ \ \\ \ \ \ \ -- / \ \ ` \\ _ -- - _ -' / _ . / / \ 1 \ - ( c) (t) \ / / / \ / / % I I I III ( I \ ,\ - - - - . - 1 1. Runoff curve Number (CN) ! l l / / \ \ _- - - l r I I 1 I I I I \\ \ \ \ /- � _ - - -- ' ,-- - _ - 1 1 _ \ems \_ / 1 I / I / / \\ -' /' ,� I 1 1 1 I I I I I I ( / 11 I \ \ \ \ \ \� -/ \ \ \ 1 � /_ �' 1111 1 I _ /�� \\ /- . I I I ! I III \ \ \ - -. \ \ -/ _- - / - - /I \ \ \ / Cover description Drainage Soil name and CN (weighted) _ (Cover type, treatment, and hydrologic condition; Area Product of Calculated Area hydrologic group CN total product/ Description (Appendix A) percent impervious; unconnected/ connected (Acres) CN x Area 'S' Value impervious area ratio) total area D.A #1 Impervious Areas 98 7.10 695.8 (Present) B Woods in Good Condition 55 6.10 335.5 69.0 4.50 Lawns in Good Condition (75 %+ Groundcover) 61 15.15 924.2 D.A. #1 Impervious Areas 98 14.77 1447.5 (Developed) B Woods in Good Condition 55 1.36 74.8 77.9 2.83 Lawns in Good Condition (75 %+ Groundcover) 61 15.63 953.4 D.A #2 Impervious Areas 98 0.00 0.0 (Present) B Woods in Good Condition 55 4.06 223.3 57.1 7.52 Lawns in Good Condition (75 %+ Groundcover) 61 2.14 130.5 D.A. #2 Impervious Areas 98 3.34 327.3 (Developed) B Woods in Good Condition 55 0.00 0.0 79.5 2.57 Lawns in Good Condition (75 %+ Groundcover) 61 3.33 203.1 Project: Westlake Hills Designed By: KKW, PE Date: 5/14/2013 \`_ -- / / 1 ! ! /J \_, \ - - -' __ -' gee / I t 1 �I I II ( ( I ( 1111 \`\ \ \ \ \\ \`�- 1`1`11 sao - -~ - - - _ =_ ; \ 1 \\ \\ \"' \ ___ - -' / Location: Crozet along Future Connector Road Checked By: KKW, PE Date: 5 14 2013 i / / / / _ - - -`' - /� �' I III I I ( j I I I / tl \ \ \ \\\ \\ �- - -' \ \ -- � ; __ _ -� \ \ \\ \ `--.- /' / l \ _ / / I / / !l - _ - J / ____ - - -' / '''� 111\!' I I 1 I I / 11 \ \ \\ \ \ ^\ �, _ - _ '- - - - \ \\ \- / / 1 / �L"'` /. -- - -- \1111 / ' I ' ( 1 III \1\ \ \ \ \\ \ -1111 \\ r 1111_/ __- / /�\ \ \ /� J / - /l , l I I I J \` \ - - - - - - \ \ \\ \\ / Check One: Present X Developed X `- \t ! / / ! % ! \____ -- / / I 1 \\ \ \\ \-� , \ -- 70 _ -__ -- - - "`- - \ ` l- \ / / - / / I I ( II `\\ \ \ -_ 5 1 \ �/ 1111 / !/ / / / /! !�_ \`___ \`- -- _ // ' /! /I # I I I I 1 1111\ \ \ \� ��/ \_- - -_ - - ' _- - - - -- 1 \\ \ \\ - -_ -' 1111 Check One: Tc X Tt Through subarea n/a I l / _ _ -- 11 / /! l '�' I I \ \ \ \ _ \ -_ _, _ _ _ - ; - _ _ _ - ! / / / / /�_ _ ! l ! # a I I 1 \\ \\ \ ` - \ \\ - 1111, 1111 - '' ' I I I'/'/ 1111 \\� \\ 1111' 1111 I !'IIII l! l I I 1 I I )1\ \\ \\ \` - -'\ \_- _ -1111 _ /_� �_ __�_' -- \ \- \ \_-- 1111 \� - / l l / l ' 1111 �, - --` \ \\ 1111 1111 / l l \1 / 1 1 \ \\\ \� _ " ' - -' -� / - -- - -__- --__� \ ` / / / _ \ \ / 1111 / I T I 1 \\ - `�- - - ___ ` ! ! / / / / / \ \ \_'- / / / //! l l l ,I ll ' I / t\ \\ `\ \ 560 _ - \ 11 11 Se mentlD: - - -- -'� / / % 1 / !/ / // \\ \ \ /, 11,11/ / 4 / /\/ / \1111 - __ _ �`'---- ___�_= __1111'/'' g - __- _ S / / / / 11I / - --- \ \ \` -. /, / // // / I // / / // / / \\ �� \\ - - -\ - ,__' / /'� -1111 _ -' \\ _ - - -- 1111,/ Sheet Flow: (Applicable to T� only) -sce- - / r r / / / ,' / - -\ `\ ` \ / / /� / ! / / / ' I /� 1111 �, �� / /J / 111 \ \ _ `- - - _ - - / 1111 / _ - IrY J / / I I b I , / \ \ \ - __ f I / / / / / / - •11 ,` 11 / I 1 \ \ - / .' \ Dense Grass Dense Grass Dense Grass Dense Grass / ) / / / / - \ \ \ \ 11 , / / / ' / ' , 11I ,, / ) \ \ \ - - - -' 1111 -' _ `- _- / ' / 1 Surface description (Table 3 -1) - _ - , _ _ ,' ' \\ `\ \\ - ' ' \ 1111 / / 1 / ! _- / / / / / / / / ///i/ .. :•: �' / \ \ \_ _ _ .' / �o -o - -- 1111 - - - -� 1 / / \\ \ / / 11 / / / /�/ ` 1111 \ \ -- -- �gi3 ��o�o - -- \o !� '�� / 2 Manning s roughness coeff., n (Table 3 -1 0.24 0.24 0.24 0.24 �� \__. 1 / / I /- \ \ \\ \ / -/ // // / j// �, / / /� /� ,:.•...:.. ....11 ) \\ 9_- �- � , � , 3 Flow length, L (total L < 100) (ft) 100 100 100 100 ` � \t` _ I j \ - , , , / / / %/ / ; �_ % -� , / \ _ 11 I 1 / 1 \ \ \ \ _ - / / / / ' / / 1111 / '/ ' / �` / ' ' \ \ �' --e _ e .e / / \ \ \ / / // // .1 M.. / ,11 / � - \ '�/ ' 1111 1111 �:. •. ... / 4 Two -year 24 -hour rainfall, P2 (in.) 3.7 3.7 3.7 3.7 - . '��1 ■ 1( \\ - - -�11 Z / 11//. / ,11 \ 1111 / 5 Land slope, s (ft /ft) 0.02 0.02 0.06 0.06 _ °� 4 _ _ _ - �1 I I j \ \ - _ -1111 1111 %1111 i ' :PO f �D: �' /- _\ _ _ 1111 �8 \ \ . / / i/ / 11 , . \ / / �, \'_ _ - - -' / I / I / ® \ --- -- 1111/// /- .:� . / \ '\ / / 6 ComputeTt= [0.007(n *L)os] / Pz s S .4 0.22 0.22 0.14 0.14 - \�\ v:` - - - -' / / \ ' - -- W /��i /;, \\\ / / -' \ �'�. \ "Y' 1111 1111 / / / Shallow Concentrated Flow: -- ,�` ` -\ x i I 1 /'� i/ �� - \ \ \\ \ - - \__ -- -11/'' "4 -\ \ ._/ I I __ . - 1111 / - / - 7 Surface description (paved or unpaved) Unpaved Unpaved Unpaved Unpaved `\ ` �\ \ \ 1 I I -_ \ J _ 1'_, ;' / 11 _ - - �- - - _ _ _ _ _ _ _ _ 8 Flow Length, L (ft) 486 486 680 709 - - ; _ `, \ \\ \ \\ _ - - / / I J //1 - - �- - 1111 /' �� ; • / / H - _ \ \, �WSA 1 c �E E S -- ---- -- - - _ - _ - - - - - - 9 Watercourse slo e s ft ft 0.038 0.038 0.138 0.082 se_\ _ \\ \I I - 1111 � / I ' 1111 ' / / / �' / �� I- "H= ` -F� M" s, ----- S p i ( / ) �- \',, 1111\`,- - -- / �i i /J r\ ' / / 1111 ! / / S 1111/' / _ \\ JI - CZI- MH -8�== __-�_ S 10 Average velocity, V (Figure 3 -1) (ft /s) 5.3 5.3 5.75 5 _ \ -,\ \ - % / - - - - - - - �I - \', \\\ - -! -- - I , // ,/ / / -Ft /11 / /i \ `� _ - - - - -- CZI -MH -83 - 11 Tt = L / 3600 *V 0.03 0.03 0.04 0.04 _. a _e _-8 --� -e- -e- \ �� _ _ = - - - - -_I- -' 1111 I / �cP SEw/ / / ' , mP OF \ _ _ - _ - _ `� - _ - - - \ _4" _ _ = g- Ste- 6-- C�� _ _ 11 11 / / �/ RwSP - - _ -' ,' ELE✓.�549.71' - \ - - - \ \ ` - _ _ - - _ - Channel Flow: o LL. o N/A _ ' -- - - - -- 5 - - \ -- _ _- `` _ - -` ` JJ t- _ _ --' _ ---_ - _ 12 Cross sectional flow area, a (ft2) o o -4 o a3: / H/ //11'� . -' y - �\ / \\ `� H / S _ CZI ,MH -86 -/' ,' ,' 1 , \'\ ,_General construction notes for Stormwater Mana ement lans _ _ c v > E �; / / SEwEa / / , Pt�u -5 4;45 _ -'' /' /'- , 1\- \\ 1---'1. All dams and constructed fill to be within 95% of maximum dry density - 13 Wetted perimeter, PW (ft) = � M N / 5 c, / ___ ! /_�/ ,' - \ `' -1 and /_ of optimum moisture content. All fill material to be approved by 14 Hydraulic radius, r = a /PH, (ft) > "- .E O /,. RwSP/ / - _ I / / I' `) \ 11' 2. Runoff \ �, M � M cu o / / / \- \\ \ (\ 111 // 1 II I \ /11 a geotechnical engineer. A geotechnical engineer is to be present during . 15 Channel (I e s (ft /ft) E / S'` / ' D.A #1 D.A. #1 D.A #2 D.A. #2 (Present) (Developed) (Present) (Developed) 2 -Year Storm 10 -Year Storm Drainage Area Description Frequency -years 2 10 n/a Rainfall, P (24 hour)- inches 3.7 5.6 n/a Runoff, Q- inches 1.07 2.40 D.A #1(Present) Runoff, Q- inches 1.65 3.22 D.A. #1(Developed) Runoff, Q- inches 0.50 1.44 D.A #2(Present) Runoff, Q- inches 1.76 3.38 D.A. #2(Developed) p I E m E � - / I I / / \ construction of dams. s 16 Manning's Roughness Coeff, n Z. o 'Z o a� r - - - j` I l !! / / I '� / ,, J/`�- _ - G I /'2. Pipe and riser joints are to be watertight within stormwater 17 V= [ 1.49 r2 /ss .s ] / n fa � a) L --- -- S --�� / _ _ - _ - , / / J -11 ' - - - F ____ - -s _-� - management facilities. _c 18 Flow length, L (ft) - -- - -- -- 11 \- ; 3• For temporary sediment traps or basins which are to be converted to 19 Tt =L /3600 *V 0.05 0.05 _ - - -____ /� 1111 / / / _ _ k \ 11 / , -- permanent stormwater management facilities; conversion is not to take 20 Watershed orsubarea T�orTt _ 4• - lace until the site is stabilize nd _ __ 11 a nd 19) 0.30 0.30 0.18 0.18 - - - - _ - - �� - "' p ' a �' (Add Tt in steps 6, __ _ �, _ _ _\ \,permission has been obtained from the County erosion control inspector. \ \ ` N M d' 1 N N LJ..1 J W Q U 1 W Q 0 N Z a D Q O oC w U') Q 2 a J J 2 W Y H U) W Z W 0 ^ a L.L.. � a O � c a J L 0 W -� W� L z W �� w �, w z art � z L.L. ° w a zaz � J L J o ,� m o o L � 3 O O V Z �° o � o a; W �� •L O 3 d W �' � L � a I r x V � o o � T •11.11 Z� E o 0 3 L c.� v� L z c rr Y w a w � wZ z °- w U z� J C 0 � L o � N L d W o Oa � o � a� > .n U O X � � V c � o w o J � O 0 JOB NO. � � o� ��zo�z •� 0 SCALE ° •� c � o � SHEET NO. a o 25 °' �o I / I \ \ \� _ _ f ! I _ _ ___ / / / 11/ ' / -_ \ / \ 1\ \ I I \ -` ` -___ - ' S - - - 1111 / / / / r- - - ® ll \ i I l \ /- I I I f n /' 1111 ' 1111 - _ l # I ! , , - _ \ ` ,I J I I III \ 1 / % 1111 i % _ ^ _ = 26.88 a c. _ 12.65 24.55 E = 26.62 a c. 11.23 24.49 _ - - - / / / / I I _ '�� 1111/ /1I / I I I I 1\ 1\\ 1 { 1' \ \ _ ___ _ .� 1111 • / / _ - J 1 ` I I ' ' ' / I / / - ___��.' / / 1 I I I 1 I \ /r =�__ _ - 11,11/ / / / _ - I / // / / - \ _ �_ - �� I > ( 1 II\ _ -/ 1111 D�1 ,/ / / I l� I I I !' .1111' 1 1I / -> '._ 1111 T / / - -_ I ) / -- _ \ \ I � ( 1 / I I I- / / / 1 /____--- / / I / / �- - -1111//% �/ -- - - -- / _ - - _ _ \ I ,�/ / I � 28 35 aC / / / I I - 1111 1111 / ! I I I \ TOP = s3.o = - - _ �_ _ / / / / _ _ _ �\ -' / _ _ r I , , _ _ \ 1 - - / 11 I _ / _ _ _ . /. / / \ / / \ N \ I / / , -1111 ,/ / / /.- - l \ ( -- -�i� -' / 11, / / / / _ _. / / _ i iii /� j / / -_- I I I \ / / / \� \ \ 1- \\ ,\ - I / /} I I / /i - ��._ / -/ CN�6 O / / �,' _ / 1111 ® I I 1 - -� ' - / -- / / 1111'/'/ I 11 `\__11 - - -_� '` _ - = :, %i % �/ / - - - _` ---- ` I I f 1 J`l 1111 / -� 1 _ _ __ _ } / _ _ / / -- r/ \� I �\ \ -�- S I -E `- -� I --_ _- _ , -TC= O.3o hrs,' 1111 '� �� - - - -- -1111 / �� / I 1 \ �� -��' / / �'' /'/ I /! _ _ - --- I - - \ / // "- - ' -'f '� i � - � � �/ �\ / 1111 g?p' - - - - - �J I I J I 1111/ / j ( / ,' w �� , I / _ -� ___ / / / / _ /� / / /�I)1 % �// 1111 / 1111 , = =\_` / /� = J -= �_ - ' / / __ _ - - -- `-- -' I l J / / ' / ~ \ \ \ I // / / \ -- / /, / � /if r- / - /// / ' - _ _- Z- -_\ -- _ %/ 1111_ - \\ / _ -_� // / , , �� \ \ \ I - -� / / / / / / ! I � � f - , / / �\ -11 / =% _ / -�\ \ / / __ \ _ I I / . ( _I / / - Q 7 ` \ / I - _ �• _ _ - _ ' / / / / - -. _ _ - / , J ,' ' / / / / / ' - / _. - _- ` �� - ,- _ / . /'�ii'% �i - / -i ,.._ -- `\ '-� / _ _ _ - - - •- - _ - - - _ 11 11 / / / / l '-- / \ \ \ \ \ \ I I / / /� I,- \ _- - - - - -' / / ' / / _ _ -' / / / / //^ _/ /f / 1111 1111 / / 11111111'// / / /i %' i - _ \ \�� \ �� -_� / % % -'ice /i'/ j %� 1 -� _ \ / �/ - - -_- �/ 1111 !' / / / O Ut \ \ \ I I / / / ' _ - / / /i i l� = -_ �\ \ \ \ - / �/ / -__ / / i -� _ -- 1111 I \ \ I 1111\ 1111 - -_ `` - / / -�- / _ / \ ✓/ �/ / / �i //� -_ _ _ =rte \ \\ \ / �// / -/ -- / _i %�- / _ __- - V _-- ' / / / / \ \ I / !. / / t I -- \ 630 - / / / \I 2g•- ' . - ' .C-' /'r j'/ -_ =g1 -� _ �` ,\ \ \ \ \ / 1111 /� / / / / / / / r- �\ _/ / i� ' / / / / / / \ \ ' / ' / /'� -`fl \ / 1111 1111 / ' ) / /�/ / '�'/ 11/11'- . / 1111 - __ - -- \ \\\ / %/ / / / �/ _- -- - -- - - -__ -� \ -� _---- - - - -__ - -- - - - -1111, / ' / / / \ \ \ \ I I / /! / / III \ / / / - . //i= _ ___- \ \ \ \\\ / 1111 / / / 1111 1111 / _ \ %/ _ \ / - / / / / - /i'- -�-- _\ \\ \ \\\ \ �// / 1111 / / 1111 _� / '� - / / / / 1111 / / 1 / _ _ / G /i/ - \\ \\ \ \ \ / / 1111 / / / / - / / / / / / - -� ' / / / /ice .- �" _ \\ \ / / / / / / - / ' - -` - _ - - -' / / / / J / \ \ / 1 / 1 1 / / /� I I I I 1 h - I _ / / ' 4 ` \. _ - - ; - _ I I / / ,' ,' / ` /� % -- / _ \ \ \ \\ \\ \ � 1111 / / / / - _. - _-7� _ \ / - - - - \ - ' ' / / ♦ \ / S EE -LL�LO Tc =No.22h\rs J I I I I I l �/1 / I {I ! I -/ ,, ' 1/ 1111 \� \` !I r \/ / , , -" / / % / /-; -ice - - 1111\\ \ ,1111 / - - _ - - - - - -- -- -- - \ / / / , i� / -/. -\ \ \ \ \iii/ / /, / - / / M s / / / / / /� -/ / / . \\\ \ \\ ,/ / 1111 / // / / / / - , / 1111 1111 1111 iI / I 1 I I I I I I I - - - 1111 I S /� \ \ /�i / -�- j// - e ` \ \ \ \\ / / 1111 / / / � / - _ - ' - _ -- -\ -- �_- _ - 1111 -/ / \ �� CONC!FLO Tc= n 3hr1s. I 1 � � 1111 1 1111 - _ \ / ___ _- / \ \ '- ! -, /% -1111 % =-52 _� ^ -� \ \ \\ ` \\ -,' / / - - - - _ -- --- - - - - -- - 1111/ ! / / I 1 1 I I I I i - - - _. ) / /� \ \ \ r j -i'/ /i - -_ \ \ \ / I -\ ' 1111' _ - • / �__J I ) I I I ' f - -- / \ ' ' -_ \\♦ \ \ 1111' /---- i.'i%/ i -J�- _ \\ \\ \\ \\ r l !1111 /� / / / \ / / - -_ r - - -' ' / / / ' ! ' I I I -` `� (/ ( � \ \ 1 / i %i-� / - -i // - - - \�\ � . \ \ 1 I l / / / / i_ -1 _ _ \ 1_ - 1111 \ / / / 1111 1111 -' I / \ 1 1 1 1 I I _ ) \ / \ \ / ' \ \ / /'� / \ I 1 III I - __- / / i- / _,, \\ \`i \ \ \ - - /r/ -i -1111'/ / / ' - - -- \ \ \\ \\ \ �..( f I l l� / / I / / i-- `` �` ` \ -- .� / r _�- / / 1 / �■ / CK�LVNEL E OW=,Q.o5hr� 111 1111 , , ; , _ _ / / I / . \ / - ' - \ \\ \ \ I- Ll / / / / \_ - / � 6 /- ' W / / 4 N 1 �1 ltl 1 t 4 ` _ 1111 / / / /'1 � a.t' \, \ \ -// 11,11 11,,,11/ 1111 -, _ \ \ \ \ \ \\ \\\ \\ 1 I i 11 / � / - , / , _ _ _ / \ \ / ` 11 11 11 } - �--- / / 1111 - / \ \\ \\ \ / ( _ / / - - - -- - - / I 1 1 I I _ - ` / �\ \ \ -. / 1111 / \ \� I I (I I ' f ( I _ - - - - -- _ - \ I \ 1 1 / / --L. \ / / �- 630 _ \ \ \ \ \ \ 1 - / -' _ / \ 1 1 I '- -I- / / / \ / / / \ / / s / FIN.aIG�Fc= ,�o.3bhr . \1 U111 1 - - i ; / �. %, "� %' -1111 ` \\ \ \ \\ \\ I (I(� I I / / / - - - \\ \ I 1 \ \\\ �Jll I I 1,\ - _ -- \ -_'� = -- / / ��'' / tt \\ \ \_ j' / �/ / i 1111 - j- / - -_ \\ \ 1111\\ \ \, \, \I I I I II I I I I /S nest / -/ _ - -`-------- - - - --- / \ E HOURISCS 1 \ \1� I \ ` _ \ I - - \ \ \ ® 4- \ 1\ -�J) I \� \ - ?o / / ' / / i \ - / 1111 % / %/ - -- \ \ \ \ \ \\ \ \ \ \ \ \ \\ I I I I I I I I L / % / ' - -- - -' \ 1 \ l 1 -� 6 EXISTING \ / / / - \ \ \ I I I \ 1 \ - 1 \ \ / / / / / 3.9' \\ / 1111/ i /- 1111 \ \ \\ \\ \\ I - - -- C- AI�GUL TIONS F_C)I?.� \ � \ __ `� _ - _ � i \ / / • ' 1111/ / _ \ ` \\ \\ \ \` 1111 I I Ii I I i I I \ % __ / _ - -- 1 \ / \ \ �� I \ I \ \ 7 \•�`. j�/ POND #1 \\\ / / /�/ /i' / J _ \ \ \ \ \ \\ I I I I I / - ' _ ' 1111 - - -j / / \ \/ ADDITLQbLAL rDETAILS I \ ��= 1\ \ \ Z � ) `` �' ' / /' / /� - \ \ \ I I ) � / / / 1 ___ - -__ - -- -__2S_ - -' V \ \ \ � �. �, . 12.2 �,/ / / � _ - ' \ _ 1 1 \ ; \ \ _ - - - -__ 10.9' \ ■ �' 1111 / -- - _ \ \ \ \ \ \ I \ i I I l __, - -/ ' _ _- - - -- I I I \ \ 1 \ \ \ _ / 1111 POND C \ / - \ \ \\ \ \� \ - \ J / / / /' { \ \ \ \ \ I\ � - � 9.s' / \ \ 1111 \ 1 / / / / I 1 ' ' I I \ ( \ \ \ \ \ /� \ -%/ /. I ( I I ' ®-/ ' ' ' ` \ ` \\ \\\ \\ \\ ' . I I I J , - -- / / / /' I I \ \ \ \ \ / r ' a.T - -- I I / / \ \ \\ \ \ \ \ \ \� ' I I / (! I I I / / // .1111 / `� / / 0 S I I \ ! \ \ - r \ I I I I I ®/ 640 - \ \\\ \ \ �_ I ( I �,- -- / / / / I 1 I I I I \ �\ \ -/ 1111 I I ( / I ®� / / \ \ \ \ \ \\ / I r I I / 1 ! ' / / \ \ \ \ / \ \ } 1 ! / / \ \ \ \ \\\ I I I / / / / E 4s' / \ \ 1 1 / \ \ \ / I I I I / -- - - - - -- ! / J 1111/ / / \ / 11 I I I I / / / / � I ' ' I I I I I \ } I \ \ \ \\ } I / \ \ \ \ 1111 \ / 1 / I I I I \ \ ) ,I \ \ \\ \ /\ a 1 \ 1 I \ 1 I I /�i� / \ \ \\\ \ \\ I I I I I r l / / ' / - / I I I \ 7.6' / I I I 1 I \ 1 / I \ \\ \ \\\ \ \ I/ / I I I l 11 j ' l I / / 1111 / / / - \ � / 1111/// 1111/ w / / -, / 1 -{ - 1-1- -- 1 I � y \ ' 1 \ �/ / � . 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I I I I / \ \ \ \ \ \ \ I �C= 0.18 hr5 '♦/ / , I I I I I 1 I 1 \ \ \ \ - \ / / / I I I / \ \ \\ \ \ \ i \ / ! /!r I I ' /S III1111III! 1 \ 1 \ / / , \ \ \ ,, / // ! / l l ! \ 1 \ \ � / l ! l I I `I I I I (1 \ \ \ \ \ \ \ \ -' 11' \ ` / / J I ' I 1 \ \ _1 \\ \ Natural Resources Conservation Service 06/04 \ \ \ _ - / / ! / / /� \ \ 1 _ - _ _ , / I III I 1 \ \ \ \ \ \ \ / / / / I 1 \ \ \ \ \ / / I / \ \ \\ \ / / / 1 I I III I I t \ \ \ \ \ \ \ \ \ \ - -' 1111 -\ \ \ ,' ,' / I \ 1 ( \ / 1111 \ \ \\\ \ \ \ \ \ 11' / // / /l 1 // \ \ / / ! I ! l \I I I 1I 1 \ \ -- / / \ V A v', �- � V A V A v -�•/ , / / / I I I III I / I\ V A\ v v v v / v v v / I v v \ A / l / / \ \ \ - i / / / / l I l I I ( I I 1 / I \\ \ \ \ \ \ \ \ \ \ ' 1111 /' / / I \ 1 / \ \ \ TR 55 Worksheet 2: Runoff Curve Number and Runoff \ \ \ \\ \ / // , l l / / / J / � \ \ \ \ \ \ \ � / / l / l / I ( l ! I, l I I III I / / I \ \ \ \ \ \ \ \ \ , / I \ ( \ \ \ x \\ \ \ \ \ \ / j / \ / I / fI I I \ \\ \ \ \ \ f s �_ I l / \ \ / / / / l l \ \ \ \ / 1111 / /I / lI / l I (! I I I I I 1 � \ \ \ \ \ 9 \ - / / / � I I 1111 \ \ \ \` \ \ / / ! ! l /\ \ \ \ \ / ,, , / J I 1 /1 I ICI 1111 I I I \I\ \ \ V \ / -'\ o \ / / / 1 I / l \ \ Project: Westlake Hills Designed By: KKW, PE Date: 5/14/2013 \ � \ \\ \ \ 11 / / / / / ! \ \ - / \ 1 \ \ \ \ \ \ \ \ \ / 11 , / / I 1 \ \ \ �- ' / /! ! ! l \ \ \ 1 - / I / ! l III I I I I I I I I I I'\ \ \ \ \ \ \ \ \ -' ,' \ \ \ \ - ' / 11 / / I / \ 1 \ 1 x U.S. De artment of A riculture FL- ENG -21A \ \ / / / \ \ \ / / ! / / I I I I It \ \ \ \ \- / / Location: Crozet alon Future Connector Road Checked B : KKW, PE Date: 5/14/2013 p g \ \\ / / I l ! \ \ \ _ -- / I l 1 I I I I I I I ( I \ \ \ \ \ \ \ \ \ ,/ 11/ 11 %! / / ! \ 1 I \ \ g Y \ / l/ I \ / / I I I 11 \ � \ \ / Natural Resources Conservation Service 06/04 \\ \ / / / ! I / \ \\ \ \ 1111 11 i ® / / / ! / I 1 I I I I I I I \\ ` \ \ ^ \ ` \ � - _- 1111 ' ' - \ \ 11 I \ , / 1111/ / / / \ \ / / / I I 1I I ) 11 \ \ \ \ \ / \ \ / / , - / / / / / / / \ \ / / / I I I I I / /II \ \ \ \_- , -\ \ \ - - ', / / / \ I I \ \ / / / \\ -- - / I I 1 1 \ \ \ \ \ \ _ - i y I / \ Check One: Present X Developed X \ \ \ - - / / / ! ' \ 1 \ \ _ -' / / ,' I / ( (I I i� l 1 I I I 1 \ \ (1t \ \ \ \ \ \ \ / \ < - _ - _ - i . _ - % ' / i i \ \ \ \ TR 55 Worksheet 3: Time of Concentration T orTravel Time T \ r / / % / / / \ \\ I 1 I I I I } \11 \ \ \\ \ \ \ \ -- / \ \ ` \\ _ -- - _ -' / _ . / / \ 1 \ - ( c) (t) \ / / / \ / / % I I I III ( I \ ,\ - - - - . - 1 1. Runoff curve Number (CN) ! l l / / \ \ _- - - l r I I 1 I I I I \\ \ \ \ /- � _ - - -- ' ,-- - _ - 1 1 _ \ems \_ / 1 I / I / / \\ -' /' ,� I 1 1 1 I I I I I I ( / 11 I \ \ \ \ \ \� -/ \ \ \ 1 � /_ �' 1111 1 I _ /�� \\ /- . I I I ! I III \ \ \ - -. \ \ -/ _- - / - - /I \ \ \ / Cover description Drainage Soil name and CN (weighted) _ (Cover type, treatment, and hydrologic condition; Area Product of Calculated Area hydrologic group CN total product/ Description (Appendix A) percent impervious; unconnected/ connected (Acres) CN x Area 'S' Value impervious area ratio) total area D.A #1 Impervious Areas 98 7.10 695.8 (Present) B Woods in Good Condition 55 6.10 335.5 69.0 4.50 Lawns in Good Condition (75 %+ Groundcover) 61 15.15 924.2 D.A. #1 Impervious Areas 98 14.77 1447.5 (Developed) B Woods in Good Condition 55 1.36 74.8 77.9 2.83 Lawns in Good Condition (75 %+ Groundcover) 61 15.63 953.4 D.A #2 Impervious Areas 98 0.00 0.0 (Present) B Woods in Good Condition 55 4.06 223.3 57.1 7.52 Lawns in Good Condition (75 %+ Groundcover) 61 2.14 130.5 D.A. #2 Impervious Areas 98 3.34 327.3 (Developed) B Woods in Good Condition 55 0.00 0.0 79.5 2.57 Lawns in Good Condition (75 %+ Groundcover) 61 3.33 203.1 Project: Westlake Hills Designed By: KKW, PE Date: 5/14/2013 \`_ -- / / 1 ! ! /J \_, \ - - -' __ -' gee / I t 1 �I I II ( ( I ( 1111 \`\ \ \ \ \\ \`�- 1`1`11 sao - -~ - - - _ =_ ; \ 1 \\ \\ \"' \ ___ - -' / Location: Crozet along Future Connector Road Checked By: KKW, PE Date: 5 14 2013 i / / / / _ - - -`' - /� �' I III I I ( j I I I / tl \ \ \ \\\ \\ �- - -' \ \ -- � ; __ _ -� \ \ \\ \ `--.- /' / l \ _ / / I / / !l - _ - J / ____ - - -' / '''� 111\!' I I 1 I I / 11 \ \ \\ \ \ ^\ �, _ - _ '- - - - \ \\ \- / / 1 / �L"'` /. -- - -- \1111 / ' I ' ( 1 III \1\ \ \ \ \\ \ -1111 \\ r 1111_/ __- / /�\ \ \ /� J / - /l , l I I I J \` \ - - - - - - \ \ \\ \\ / Check One: Present X Developed X `- \t ! / / ! % ! \____ -- / / I 1 \\ \ \\ \-� , \ -- 70 _ -__ -- - - "`- - \ ` l- \ / / - / / I I ( II `\\ \ \ -_ 5 1 \ �/ 1111 / !/ / / / /! !�_ \`___ \`- -- _ // ' /! /I # I I I I 1 1111\ \ \ \� ��/ \_- - -_ - - ' _- - - - -- 1 \\ \ \\ - -_ -' 1111 Check One: Tc X Tt Through subarea n/a I l / _ _ -- 11 / /! l '�' I I \ \ \ \ _ \ -_ _, _ _ _ - ; - _ _ _ - ! / / / / /�_ _ ! l ! # a I I 1 \\ \\ \ ` - \ \\ - 1111, 1111 - '' ' I I I'/'/ 1111 \\� \\ 1111' 1111 I !'IIII l! l I I 1 I I )1\ \\ \\ \` - -'\ \_- _ -1111 _ /_� �_ __�_' -- \ \- \ \_-- 1111 \� - / l l / l ' 1111 �, - --` \ \\ 1111 1111 / l l \1 / 1 1 \ \\\ \� _ " ' - -' -� / - -- - -__- --__� \ ` / / / _ \ \ / 1111 / I T I 1 \\ - `�- - - ___ ` ! ! / / / / / \ \ \_'- / / / //! l l l ,I ll ' I / t\ \\ `\ \ 560 _ - \ 11 11 Se mentlD: - - -- -'� / / % 1 / !/ / // \\ \ \ /, 11,11/ / 4 / /\/ / \1111 - __ _ �`'---- ___�_= __1111'/'' g - __- _ S / / / / 11I / - --- \ \ \` -. /, / // // / I // / / // / / \\ �� \\ - - -\ - ,__' / /'� -1111 _ -' \\ _ - - -- 1111,/ Sheet Flow: (Applicable to T� only) -sce- - / r r / / / ,' / - -\ `\ ` \ / / /� / ! / / / ' I /� 1111 �, �� / /J / 111 \ \ _ `- - - _ - - / 1111 / _ - IrY J / / I I b I , / \ \ \ - __ f I / / / / / / - •11 ,` 11 / I 1 \ \ - / .' \ Dense Grass Dense Grass Dense Grass Dense Grass / ) / / / / - \ \ \ \ 11 , / / / ' / ' , 11I ,, / ) \ \ \ - - - -' 1111 -' _ `- _- / ' / 1 Surface description (Table 3 -1) - _ - , _ _ ,' ' \\ `\ \\ - ' ' \ 1111 / / 1 / ! _- / / / / / / / / ///i/ .. :•: �' / \ \ \_ _ _ .' / �o -o - -- 1111 - - - -� 1 / / \\ \ / / 11 / / / /�/ ` 1111 \ \ -- -- �gi3 ��o�o - -- \o !� '�� / 2 Manning s roughness coeff., n (Table 3 -1 0.24 0.24 0.24 0.24 �� \__. 1 / / I /- \ \ \\ \ / -/ // // / j// �, / / /� /� ,:.•...:.. ....11 ) \\ 9_- �- � , � , 3 Flow length, L (total L < 100) (ft) 100 100 100 100 ` � \t` _ I j \ - , , , / / / %/ / ; �_ % -� , / \ _ 11 I 1 / 1 \ \ \ \ _ - / / / / ' / / 1111 / '/ ' / �` / ' ' \ \ �' --e _ e .e / / \ \ \ / / // // .1 M.. / ,11 / � - \ '�/ ' 1111 1111 �:. •. ... / 4 Two -year 24 -hour rainfall, P2 (in.) 3.7 3.7 3.7 3.7 - . '��1 ■ 1( \\ - - -�11 Z / 11//. / ,11 \ 1111 / 5 Land slope, s (ft /ft) 0.02 0.02 0.06 0.06 _ °� 4 _ _ _ - �1 I I j \ \ - _ -1111 1111 %1111 i ' :PO f �D: �' /- _\ _ _ 1111 �8 \ \ . / / i/ / 11 , . \ / / �, \'_ _ - - -' / I / I / ® \ --- -- 1111/// /- .:� . / \ '\ / / 6 ComputeTt= [0.007(n *L)os] / Pz s S .4 0.22 0.22 0.14 0.14 - \�\ v:` - - - -' / / \ ' - -- W /��i /;, \\\ / / -' \ �'�. \ "Y' 1111 1111 / / / Shallow Concentrated Flow: -- ,�` ` -\ x i I 1 /'� i/ �� - \ \ \\ \ - - \__ -- -11/'' "4 -\ \ ._/ I I __ . - 1111 / - / - 7 Surface description (paved or unpaved) Unpaved Unpaved Unpaved Unpaved `\ ` �\ \ \ 1 I I -_ \ J _ 1'_, ;' / 11 _ - - �- - - _ _ _ _ _ _ _ _ 8 Flow Length, L (ft) 486 486 680 709 - - ; _ `, \ \\ \ \\ _ - - / / I J //1 - - �- - 1111 /' �� ; • / / H - _ \ \, �WSA 1 c �E E S -- ---- -- - - _ - _ - - - - - - 9 Watercourse slo e s ft ft 0.038 0.038 0.138 0.082 se_\ _ \\ \I I - 1111 � / I ' 1111 ' / / / �' / �� I- "H= ` -F� M" s, ----- S p i ( / ) �- \',, 1111\`,- - -- / �i i /J r\ ' / / 1111 ! / / S 1111/' / _ \\ JI - CZI- MH -8�== __-�_ S 10 Average velocity, V (Figure 3 -1) (ft /s) 5.3 5.3 5.75 5 _ \ -,\ \ - % / - - - - - - - �I - \', \\\ - -! -- - I , // ,/ / / -Ft /11 / /i \ `� _ - - - - -- CZI -MH -83 - 11 Tt = L / 3600 *V 0.03 0.03 0.04 0.04 _. a _e _-8 --� -e- -e- \ �� _ _ = - - - - -_I- -' 1111 I / �cP SEw/ / / ' , mP OF \ _ _ - _ - _ `� - _ - - - \ _4" _ _ = g- Ste- 6-- C�� _ _ 11 11 / / �/ RwSP - - _ -' ,' ELE✓.�549.71' - \ - - - \ \ ` - _ _ - - _ - Channel Flow: o LL. o N/A _ ' -- - - - -- 5 - - \ -- _ _- `` _ - -` ` JJ t- _ _ --' _ ---_ - _ 12 Cross sectional flow area, a (ft2) o o -4 o a3: / H/ //11'� . -' y - �\ / \\ `� H / S _ CZI ,MH -86 -/' ,' ,' 1 , \'\ ,_General construction notes for Stormwater Mana ement lans _ _ c v > E �; / / SEwEa / / , Pt�u -5 4;45 _ -'' /' /'- , 1\- \\ 1---'1. All dams and constructed fill to be within 95% of maximum dry density - 13 Wetted perimeter, PW (ft) = � M N / 5 c, / ___ ! /_�/ ,' - \ `' -1 and /_ of optimum moisture content. All fill material to be approved by 14 Hydraulic radius, r = a /PH, (ft) > "- .E O /,. RwSP/ / - _ I / / I' `) \ 11' 2. Runoff \ �, M � M cu o / / / \- \\ \ (\ 111 // 1 II I \ /11 a geotechnical engineer. A geotechnical engineer is to be present during . 15 Channel (I e s (ft /ft) E / S'` / ' D.A #1 D.A. #1 D.A #2 D.A. #2 (Present) (Developed) (Present) (Developed) 2 -Year Storm 10 -Year Storm Drainage Area Description Frequency -years 2 10 n/a Rainfall, P (24 hour)- inches 3.7 5.6 n/a Runoff, Q- inches 1.07 2.40 D.A #1(Present) Runoff, Q- inches 1.65 3.22 D.A. #1(Developed) Runoff, Q- inches 0.50 1.44 D.A #2(Present) Runoff, Q- inches 1.76 3.38 D.A. #2(Developed) p I E m E � - / I I / / \ construction of dams. s 16 Manning's Roughness Coeff, n Z. o 'Z o a� r - - - j` I l !! / / I '� / ,, J/`�- _ - G I /'2. Pipe and riser joints are to be watertight within stormwater 17 V= [ 1.49 r2 /ss .s ] / n fa � a) L --- -- S --�� / _ _ - _ - , / / J -11 ' - - - F ____ - -s _-� - management facilities. _c 18 Flow length, L (ft) - -- - -- -- 11 \- ; 3• For temporary sediment traps or basins which are to be converted to 19 Tt =L /3600 *V 0.05 0.05 _ - - -____ /� 1111 / / / _ _ k \ 11 / , -- permanent stormwater management facilities; conversion is not to take 20 Watershed orsubarea T�orTt _ 4• - lace until the site is stabilize nd _ __ 11 a nd 19) 0.30 0.30 0.18 0.18 - - - - _ - - �� - "' p ' a �' (Add Tt in steps 6, __ _ �, _ _ _\ \,permission has been obtained from the County erosion control inspector. \ \ ` N M d' 1 N N LJ..1 J W Q U 1 W Q 0 N Z a D Q O oC w U') Q 2 a J J 2 W Y H U) W Z W 0 ^ a L.L.. � a O � c a J L 0 W -� W� L z W �� w �, w z art � z L.L. ° w a zaz � J L J o ,� m o o L � 3 O O V Z �° o � o a; W �� •L O 3 d W �' � L � a I r x V � o o � T •11.11 Z� E o 0 3 L c.� v� L z c rr Y w a w � wZ z °- w U z� J C 0 � L o � N L d W o Oa � o � a� > .n U O X � � V c � o w o J � O 0 JOB NO. � � o� ��zo�z •� 0 SCALE ° •� c � o � SHEET NO. a o 25 °' �o \ / - -- -- _ r - / - __ --- - - - - -- I / J / / / / \ \ �` / / \ ` \ \\ \- 1111 _-_ 1111 1111 -__ ,/ ,. ��,_ _---- -- - - -- - -I \ / 0 -, ' I ' 1111 / 1111 ' -- 1111 % /" -- - -' - -` - \ \\ \ \ 1 I r \ \` \\\ ` 1111 / I / /1/ 1 J / , -- \\ \ \ \ \ `\ M M M M M � I , / /\ \ ® / I _ -- \ \ \ 11 / ,/ 11, / 1111 / -� - - -\ __ / 0 \\ 1 / / - - - -' �\ \ \ \ \ 1 \ /l \ \ \\ i- N N � L 1 u, I /' -/ \ \ \ \ \\ �� \ \ a \\ \: -/ -_ ' /i / 11. / sao - - - - -- _ _ / / J / -;-� - - -'' _ \ \ / J /�\\ _ 11 / I I _ \ \ ¢ N N M ,-4 •r1 ,_ J / / `- - / , \ \ \ \ \ \ \� , /- / /, / / / -/ \ - - -- _- - - - -`` - / 1 1 1 S�I E�TEL�Vt/ c= f5 / _ \ \ `-- _- ___ - -- ,� ! l I / l I I - \ \ \ \ / \ �// \ / _� / ' - -- I - ��.- �F _ �- - _ \ \ ' /l / / \\ \� - -_ _/ /- 1 / I lI / \ \ \`\ \ \ 1 to Imo. 1 ! , I 1 / i / \ i - \ \ �__ �- / 1 \ \ O �TI`S� \ \ / . \ ! / \ \ \ N �n r\ m rn \ / /\ \ \ `\ V \ - -` - \ \\ / / -- / 1111 / 11, -� _ ® / . I / i - - -_ / -` \\ -___ -/ / / \ \\ \� I 11 1 I I I l \ ` \ \ '\ \ \ _ WW1 �CiNC. __ - I - _ , - b 1 /� /L4�lilo_oh_rs�_ _ // 1 \\ \ \\ \\ \ __ 1111 / / / / / / / / ' 1111 // !! 1111 1111_ -_ -- - -- \ \\ \ \ \ \ --. / / \ -, - / 1 III j 1 1 \ \ \ 1 / / / \/ � l %� ` -` --' / i/ ' / o - ' � ®- -650 \ / �� _ \ I / / '_ \ \ / J I ! r / l � \ \ \ / / / / / \ \ \ \� / . / / __ _ __ \ I l / / \ \ \ \� / \ /��\ \\ _ -_J / 1111 / - - - - - -� ♦/ \ / / , _ - - - \ \ -- / I /r \ \ -- ' I I I ! I \ -- \ ' ! !/ / / / / \ � \ \ \ \ \ - - -- / / / 1111 /� / / / � _1111 gyp\ / / / /T��o;�.z�"1r5� - - - -- \ `� / \ \ '- _ / 11 \ - / \ \ \ / / / ♦ / / / / - -- \ \ '� � _ 1111 \ \ -. \ / \ \ / _, / / h / / / _ \ / \ 11/ , I 1 I r\ \ \ \\ 1111 / !! / / / \ \ \\ \ 1 %' \ \ - \, " -� -•/ / / 1111 / � / -® / \\ v �• / / / / EJZ /L} /l i� 'S�S j _ _ -- , \ \ \ \ \\ -� \ \\ - -- / / I I 1 / � \\ 1111 ! /JJI �( I I I ( / I \ \ \\ \ \I i ( 1111 / / \ \ \ \ \ / \ \ \\- y- �_� _- - / / / ®^ 6 ' -` �' / / - -- \ \ / \ \ - / I I I \ \ \ \ / / \ / ( \ - ! I I I I / \ \ \ \ - / / -� / / - \ \ _ �/ / 1111 ! / I !/ 1111 \ \\ I I I \ ~� \ / I I I J J \\ / / \ 1 I - / / / l i ® s♦} l / - ! / ! ! CAL�U,(L�4`FiO�is- FOR - _ , I s20 _ - ! I ( ( - _ III 1 I r \ / I \ I / / /- \ \ �s / - I �� / - - - -� - \ \ ` 1 \ -/ 4 \. \_ -� / , '♦ o / , / 1111 -, �_! / ! AaDVT[�L\CAL T `rf __-=� 'I ._ \ / / _ / / / / \ \ \ \ \ ( ._' I / \ V /! 1 �� - -� � � v ( �s - - -v v / I / Il v v /\/J ! l / / I I I ` ® \��- 0 \ \ / `/ / I,/ I//, 1111 � ' - \ \ \ \ \ \ / I I ( ( r\\ \ \ J / I I I l \ III l l l L / - - _ / - \ I \, / l / 1 / _ _ p - \ / / , / l / I I / I t I / / \ / / / ! // ! / / 1 / I / P.�. \ \ - I ' / O-- -- -\ \\ \ / l / I I I � / -11 __ `\ \ -- \\ \ .1. / \ \- / / // / \ /\ ! - r S - -'- ' \ 1111 / / / - -�\ \ \ - / ° I I III I 11/11 - -- \\ \\ - - - - -_ 11'/ / I 1 \\ ,- - ' I l / l ! / l / / ! 1 l / ( -- E __ \ * / / / ! I \ \ / / . I I I I I {11 1Uitl / / \ \ \ \\ ` \ \ \\ I \ / \ / I I / / ( I I / I - - J '� i a► / / I / / 1111 -� \ \� \ `\ I I l I j 1 1 I / / /` --- \ \ \\ \ _ \ \ -- 1111 I / ' I I \ t I � `, \�' / / / / / / \\ \\ \\ I 1 I I II 1111 / __ \ \ \ \ \ \ ` \\ \\ - -- -- / / / / / / / \ \ !! !/ \ / 1 S \ �s ____ +� 650 - / 1111 / / \ \ \� \\ J I I J 1 I I � \ \ \ \ \ \ \��`\ \ \ \ \ / 1 I / '- \ ) 1 -- \ 1 . �-� �- � / / / / \ / ! I I 111 Il \ 1 ( \ \ \ \ \ \ \ \ \ \ � 1111 f / -\ ,� / , 1 / / / \ ' / / ! / \ \ \ \ 1 - - - - „� / / - / / l / / � ` \ \ \\ I I 1 I ! 11 1 1111 \ \ 1 1 11 \ \ \ \N \ \ \ \ \ ---- - - - - -- --- / r / / / - \ _/ / / / ( \ �� Is \ / / / l 1 I I / / \ \ \ f I I 1 \ \ \ / I l � \__ / l 1 / / / /,, / / / \� \�\ \ \ \ \ - / \ f 1 I 11\ \ 1 1 \ \ - \ 1111 I \ {♦ � _____- GRAPHIC SCALE ,/ , / I I 1 I I / / \\ �\ A I 1 I 1 �I � � \\ \ 1 \ \ \ \ \ \ \ � / ! � r / .\ `\`\ / ! / ! \ I I 1 1 \ \ t 1 \ \ \ \ \ / / / / /� / / / -\ \ \ 1 \ \ ! b _ / / l 1 l / -\ \ \ \\ \ \� II I \ 1 1111\ \ I I 1 \ \ \ \ `\\ \ \ \ \ \ \ \ 1 1111 ,� I I I 1 / ! 1 \\ \\\_ _/ , / l r / \ / / \ 1 I i 1 1 1 \ I - - _- ---- - - - -�\ 80 0 40 80 160 320 - - - -_ ,' / I I 1 I } I / / / \\ \ \ \ \ 1 I 1 \ \ \ 1\ 1 1 I1\ \ 1 I I 1 1 \ \\ \\ \ \ \ \ \\ \ \ o - - / / / l - _ \ -- _ / / l / 11 \\ \ / I I \ \ \ 1 \\ 1 I \ \ \ \ \ 61 -' / I I / \ \ / \ / / \ \ \ \ 1 1 \\ 1 1 \ \ ' -� I I I ! \ \ ' ! 1 �\ \ \ I 1 ' , � \ / 1 / \\ \ \ II \ \ 1 N,V \\\ 1 I I I \ \ �, \ \\ \\ \ / ! I I I I l ! II \� - 1 \ kti - I I I I I \ \ \ I I I 1 1 \ 1 \ \ \ \ \ - - - -- / I __ \ 1111 / I ♦ � \ _ 7 \ � 1 I 1 \ \ \_, l \ / _ I ( /I I \ \ '! IY I I I J l I I ` ♦ \ - -" - -- 1111 ' I ` \ I 1 1 , I 111 1 (I 1 \ `\ \ \ \ \ \ \ \ 1 \ I r - `�\ - I I I \ ♦ / I 1 I / \\ \` \\ ' 1} 1N,''\ \`\ It I \ \ \ \\ \ \ , 1111 ! I I II /I r I 11 I ( I l l \ ' \ - - - -- 1111 / I 1 , 111 I 1111 - \ \ \ \ I t , I , , 1 1 \ \ 1 1 I ! \ \ \ \\ `\\ \\ \ _ - �/ I , / \ J I , /� \\ / - I I I I I I I \ \ 1 1 \ \ \ \ \ \ \ ! I \ I ! I I ! I / I / ♦ \ 1 \ ( IN FEET ) / 1 1 1 \ a \ \ / I 1 \ \ 1 I ! \ \ \ \ / I I I / p 1 , f( I I t \ ! 1 1 \ 1 l \ \ \ \\ \ - l i l I - \\ f I \ 1 1 1 \ /I CO I I / \ t�1� I / / I '� r 1 6 � 1 I \ \ \ \ \ - - 1111 / l \ 1 I \ \ \ \ \ \ / / I \ 1 I I \ 1 I \ I 1 inch = 80 ft / 1! J I 1 \ \ / I I I 1 1 \\ \ f1 I I ! 1 I / \ \ \ / ! I 1 Il 1 1 \ \\ \\ \ I (( \ \ \ - f ( ( \ \ 1 1 I II 1 \ I 1 / \ ' / / ! / f II /� \ \ \ 1 \ / / I I 1 1 111 1 \ \ \ \ \1111 I I I I i \ \\ \ \ \\ \ \ \ \ \ \ 1 1 � �-�� 1 ( � \ 1 1 I � v v 1 \ \ \ r \ -- /,- / / / 1 I I \ \ \ \ / I I I 1 I \ \ \ \ _--- _ - - - -_ / 1 I \ \ \ \ 1 7 I I I I \ I I ( l \--. / III I 1 \ ' III I (I 1 \ 1 I \ \ \ \ \ `'- _ � ! \ \_/ I \ 1 1 \ �I I \ _ / 1\1 \ I \ \ \ \ \ \ \ \ / I / \ \ \-/ I \ \ \ \ \ / t \ ' ! I ( / \_` \ 1 1 1 I 1 \ \ \ \ / I I ! \ \ \\ / 1 \ 1 \ 1 \ \ 1 1\ \\ \ \ I I ) / / 111' \ \ \\ \ 0 /I I I II\\ \1111 IIII \ \ \ \ \ \ \ - ! \ J \ 1 \ \ \ \\ i - !I ! I D.A. #2 \I \ 1111 r 1 11 1 \ \\I } / \ \\ \\ \\ \ / r /1 II I \ \ I\ \ \ \ I I \ , /� \ \ //, � / \�\ 1111 ! 1111 11 \ 11 \ / / ! / I I I I I II \1 11 II 1 1 I \ \\ \ \\ \\ \\ \\ \ \ \ \\ \ - -- - - 600 - / // I r / I I 1 I l \ \ \ x -J 11 \ \ \ 1 \ \ \ \ 1 \/ \ ,I / \ \\ -' ,/ / III 6.30,acl 1 I I \ / / / I I I I I I 1 I 111/111/ JI \ \ \ \ \ \ \ \ \ \ _ / I I I r /- \\ I I I I v Y I 1 I _ \ V A 1111 - / // /f / I V \ I I v\ v 1 v i I, \ \ - - -- -\ ! 111 I 1 / 1 I 1 II 11 t I \1 \ \ \ \ \ \ \\ . - -- \ I 1 1 1 \ \ , \ 1 _1 /\ / t / / / / 1 N=S�\1 1 I 1 \ V / / / / !, / I I , I I \ \ \ \ \ \ �_ \ / x 1 1 t 1\\, / / \ 1 \ '� I I 1 ) \`\ \ \ \ \ 1111 \ / � I \ \ U.S. Department of Agriculture \ / 1 \ �''' ' / ' �% �''/ -\ 1 1 1 - ' / I I I I I 111 / \ \ \ \ \ ( \ \ \ FL- ENG -21A / 1 \ / / \ 1 I / / 1 / ( I I 1 ( I I 1 \\ \ \ \\ \ \\ �/ \\ \ \ \_ -/ 1111 / I I I /! /- \� `\ \ \ 1 \ \, / / ! I I I I / \ \ \ \ \ \ \ I �C= 0.18 hr5 '♦/ / , I I I I I 1 I 1 \ \ \ \ - \ / / / I I I / \ \ \\ \ \ \ i \ / ! /!r I I ' /S III1111III! 1 \ 1 \ / / , \ \ \ ,, / // ! / l l ! \ 1 \ \ � / l ! l I I `I I I I (1 \ \ \ \ \ \ \ \ -' 11' \ ` / / J I ' I 1 \ \ _1 \\ \ Natural Resources Conservation Service 06/04 \ \ \ _ - / / ! / / /� \ \ 1 _ - _ _ , / I III I 1 \ \ \ \ \ \ \ / / / / I 1 \ \ \ \ \ / / I / \ \ \\ \ / / / 1 I I III I I t \ \ \ \ \ \ \ \ \ \ - -' 1111 -\ \ \ ,' ,' / I \ 1 ( \ / 1111 \ \ \\\ \ \ \ \ \ 11' / // / /l 1 // \ \ / / ! I ! l \I I I 1I 1 \ \ -- / / \ V A v', �- � V A V A v -�•/ , / / / I I I III I / I\ V A\ v v v v / v v v / I v v \ A / l / / \ \ \ - i / / / / l I l I I ( I I 1 / I \\ \ \ \ \ \ \ \ \ \ ' 1111 /' / / I \ 1 / \ \ \ TR 55 Worksheet 2: Runoff Curve Number and Runoff \ \ \ \\ \ / // , l l / / / J / � \ \ \ \ \ \ \ � / / l / l / I ( l ! I, l I I III I / / I \ \ \ \ \ \ \ \ \ , / I \ ( \ \ \ x \\ \ \ \ \ \ / j / \ / I / fI I I \ \\ \ \ \ \ f s �_ I l / \ \ / / / / l l \ \ \ \ / 1111 / /I / lI / l I (! I I I I I 1 � \ \ \ \ \ 9 \ - / / / � I I 1111 \ \ \ \` \ \ / / ! ! l /\ \ \ \ \ / ,, , / J I 1 /1 I ICI 1111 I I I \I\ \ \ V \ / -'\ o \ / / / 1 I / l \ \ Project: Westlake Hills Designed By: KKW, PE Date: 5/14/2013 \ � \ \\ \ \ 11 / / / / / ! \ \ - / \ 1 \ \ \ \ \ \ \ \ \ / 11 , / / I 1 \ \ \ �- ' / /! ! ! l \ \ \ 1 - / I / ! l III I I I I I I I I I I'\ \ \ \ \ \ \ \ \ -' ,' \ \ \ \ - ' / 11 / / I / \ 1 \ 1 x U.S. De artment of A riculture FL- ENG -21A \ \ / / / \ \ \ / / ! / / I I I I It \ \ \ \ \- / / Location: Crozet alon Future Connector Road Checked B : KKW, PE Date: 5/14/2013 p g \ \\ / / I l ! \ \ \ _ -- / I l 1 I I I I I I I ( I \ \ \ \ \ \ \ \ \ ,/ 11/ 11 %! / / ! \ 1 I \ \ g Y \ / l/ I \ / / I I I 11 \ � \ \ / Natural Resources Conservation Service 06/04 \\ \ / / / ! I / \ \\ \ \ 1111 11 i ® / / / ! / I 1 I I I I I I I \\ ` \ \ ^ \ ` \ � - _- 1111 ' ' - \ \ 11 I \ , / 1111/ / / / \ \ / / / I I 1I I ) 11 \ \ \ \ \ / \ \ / / , - / / / / / / / \ \ / / / I I I I I / /II \ \ \ \_- , -\ \ \ - - ', / / / \ I I \ \ / / / \\ -- - / I I 1 1 \ \ \ \ \ \ _ - i y I / \ Check One: Present X Developed X \ \ \ - - / / / ! ' \ 1 \ \ _ -' / / ,' I / ( (I I i� l 1 I I I 1 \ \ (1t \ \ \ \ \ \ \ / \ < - _ - _ - i . _ - % ' / i i \ \ \ \ TR 55 Worksheet 3: Time of Concentration T orTravel Time T \ r / / % / / / \ \\ I 1 I I I I } \11 \ \ \\ \ \ \ \ -- / \ \ ` \\ _ -- - _ -' / _ . / / \ 1 \ - ( c) (t) \ / / / \ / / % I I I III ( I \ ,\ - - - - . - 1 1. Runoff curve Number (CN) ! l l / / \ \ _- - - l r I I 1 I I I I \\ \ \ \ /- � _ - - -- ' ,-- - _ - 1 1 _ \ems \_ / 1 I / I / / \\ -' /' ,� I 1 1 1 I I I I I I ( / 11 I \ \ \ \ \ \� -/ \ \ \ 1 � /_ �' 1111 1 I _ /�� \\ /- . I I I ! I III \ \ \ - -. \ \ -/ _- - / - - /I \ \ \ / Cover description Drainage Soil name and CN (weighted) _ (Cover type, treatment, and hydrologic condition; Area Product of Calculated Area hydrologic group CN total product/ Description (Appendix A) percent impervious; unconnected/ connected (Acres) CN x Area 'S' Value impervious area ratio) total area D.A #1 Impervious Areas 98 7.10 695.8 (Present) B Woods in Good Condition 55 6.10 335.5 69.0 4.50 Lawns in Good Condition (75 %+ Groundcover) 61 15.15 924.2 D.A. #1 Impervious Areas 98 14.77 1447.5 (Developed) B Woods in Good Condition 55 1.36 74.8 77.9 2.83 Lawns in Good Condition (75 %+ Groundcover) 61 15.63 953.4 D.A #2 Impervious Areas 98 0.00 0.0 (Present) B Woods in Good Condition 55 4.06 223.3 57.1 7.52 Lawns in Good Condition (75 %+ Groundcover) 61 2.14 130.5 D.A. #2 Impervious Areas 98 3.34 327.3 (Developed) B Woods in Good Condition 55 0.00 0.0 79.5 2.57 Lawns in Good Condition (75 %+ Groundcover) 61 3.33 203.1 Project: Westlake Hills Designed By: KKW, PE Date: 5/14/2013 \`_ -- / / 1 ! ! /J \_, \ - - -' __ -' gee / I t 1 �I I II ( ( I ( 1111 \`\ \ \ \ \\ \`�- 1`1`11 sao - -~ - - - _ =_ ; \ 1 \\ \\ \"' \ ___ - -' / Location: Crozet along Future Connector Road Checked By: KKW, PE Date: 5 14 2013 i / / / / _ - - -`' - /� �' I III I I ( j I I I / tl \ \ \ \\\ \\ �- - -' \ \ -- � ; __ _ -� \ \ \\ \ `--.- /' / l \ _ / / I / / !l - _ - J / ____ - - -' / '''� 111\!' I I 1 I I / 11 \ \ \\ \ \ ^\ �, _ - _ '- - - - \ \\ \- / / 1 / �L"'` /. -- - -- \1111 / ' I ' ( 1 III \1\ \ \ \ \\ \ -1111 \\ r 1111_/ __- / /�\ \ \ /� J / - /l , l I I I J \` \ - - - - - - \ \ \\ \\ / Check One: Present X Developed X `- \t ! / / ! % ! \____ -- / / I 1 \\ \ \\ \-� , \ -- 70 _ -__ -- - - "`- - \ ` l- \ / / - / / I I ( II `\\ \ \ -_ 5 1 \ �/ 1111 / !/ / / / /! !�_ \`___ \`- -- _ // ' /! /I # I I I I 1 1111\ \ \ \� ��/ \_- - -_ - - ' _- - - - -- 1 \\ \ \\ - -_ -' 1111 Check One: Tc X Tt Through subarea n/a I l / _ _ -- 11 / /! l '�' I I \ \ \ \ _ \ -_ _, _ _ _ - ; - _ _ _ - ! / / / / /�_ _ ! l ! # a I I 1 \\ \\ \ ` - \ \\ - 1111, 1111 - '' ' I I I'/'/ 1111 \\� \\ 1111' 1111 I !'IIII l! l I I 1 I I )1\ \\ \\ \` - -'\ \_- _ -1111 _ /_� �_ __�_' -- \ \- \ \_-- 1111 \� - / l l / l ' 1111 �, - --` \ \\ 1111 1111 / l l \1 / 1 1 \ \\\ \� _ " ' - -' -� / - -- - -__- --__� \ ` / / / _ \ \ / 1111 / I T I 1 \\ - `�- - - ___ ` ! ! / / / / / \ \ \_'- / / / //! l l l ,I ll ' I / t\ \\ `\ \ 560 _ - \ 11 11 Se mentlD: - - -- -'� / / % 1 / !/ / // \\ \ \ /, 11,11/ / 4 / /\/ / \1111 - __ _ �`'---- ___�_= __1111'/'' g - __- _ S / / / / 11I / - --- \ \ \` -. /, / // // / I // / / // / / \\ �� \\ - - -\ - ,__' / /'� -1111 _ -' \\ _ - - -- 1111,/ Sheet Flow: (Applicable to T� only) -sce- - / r r / / / ,' / - -\ `\ ` \ / / /� / ! / / / ' I /� 1111 �, �� / /J / 111 \ \ _ `- - - _ - - / 1111 / _ - IrY J / / I I b I , / \ \ \ - __ f I / / / / / / - •11 ,` 11 / I 1 \ \ - / .' \ Dense Grass Dense Grass Dense Grass Dense Grass / ) / / / / - \ \ \ \ 11 , / / / ' / ' , 11I ,, / ) \ \ \ - - - -' 1111 -' _ `- _- / ' / 1 Surface description (Table 3 -1) - _ - , _ _ ,' ' \\ `\ \\ - ' ' \ 1111 / / 1 / ! _- / / / / / / / / ///i/ .. :•: �' / \ \ \_ _ _ .' / �o -o - -- 1111 - - - -� 1 / / \\ \ / / 11 / / / /�/ ` 1111 \ \ -- -- �gi3 ��o�o - -- \o !� '�� / 2 Manning s roughness coeff., n (Table 3 -1 0.24 0.24 0.24 0.24 �� \__. 1 / / I /- \ \ \\ \ / -/ // // / j// �, / / /� /� ,:.•...:.. ....11 ) \\ 9_- �- � , � , 3 Flow length, L (total L < 100) (ft) 100 100 100 100 ` � \t` _ I j \ - , , , / / / %/ / ; �_ % -� , / \ _ 11 I 1 / 1 \ \ \ \ _ - / / / / ' / / 1111 / '/ ' / �` / ' ' \ \ �' --e _ e .e / / \ \ \ / / // // .1 M.. / ,11 / � - \ '�/ ' 1111 1111 �:. •. ... / 4 Two -year 24 -hour rainfall, P2 (in.) 3.7 3.7 3.7 3.7 - . '��1 ■ 1( \\ - - -�11 Z / 11//. / ,11 \ 1111 / 5 Land slope, s (ft /ft) 0.02 0.02 0.06 0.06 _ °� 4 _ _ _ - �1 I I j \ \ - _ -1111 1111 %1111 i ' :PO f �D: �' /- _\ _ _ 1111 �8 \ \ . / / i/ / 11 , . \ / / �, \'_ _ - - -' / I / I / ® \ --- -- 1111/// /- .:� . / \ '\ / / 6 ComputeTt= [0.007(n *L)os] / Pz s S .4 0.22 0.22 0.14 0.14 - \�\ v:` - - - -' / / \ ' - -- W /��i /;, \\\ / / -' \ �'�. \ "Y' 1111 1111 / / / Shallow Concentrated Flow: -- ,�` ` -\ x i I 1 /'� i/ �� - \ \ \\ \ - - \__ -- -11/'' "4 -\ \ ._/ I I __ . - 1111 / - / - 7 Surface description (paved or unpaved) Unpaved Unpaved Unpaved Unpaved `\ ` �\ \ \ 1 I I -_ \ J _ 1'_, ;' / 11 _ - - �- - - _ _ _ _ _ _ _ _ 8 Flow Length, L (ft) 486 486 680 709 - - ; _ `, \ \\ \ \\ _ - - / / I J //1 - - �- - 1111 /' �� ; • / / H - _ \ \, �WSA 1 c �E E S -- ---- -- - - _ - _ - - - - - - 9 Watercourse slo e s ft ft 0.038 0.038 0.138 0.082 se_\ _ \\ \I I - 1111 � / I ' 1111 ' / / / �' / �� I- "H= ` -F� M" s, ----- S p i ( / ) �- \',, 1111\`,- - -- / �i i /J r\ ' / / 1111 ! / / S 1111/' / _ \\ JI - CZI- MH -8�== __-�_ S 10 Average velocity, V (Figure 3 -1) (ft /s) 5.3 5.3 5.75 5 _ \ -,\ \ - % / - - - - - - - �I - \', \\\ - -! -- - I , // ,/ / / -Ft /11 / /i \ `� _ - - - - -- CZI -MH -83 - 11 Tt = L / 3600 *V 0.03 0.03 0.04 0.04 _. a _e _-8 --� -e- -e- \ �� _ _ = - - - - -_I- -' 1111 I / �cP SEw/ / / ' , mP OF \ _ _ - _ - _ `� - _ - - - \ _4" _ _ = g- Ste- 6-- C�� _ _ 11 11 / / �/ RwSP - - _ -' ,' ELE✓.�549.71' - \ - - - \ \ ` - _ _ - - _ - Channel Flow: o LL. o N/A _ ' -- - - - -- 5 - - \ -- _ _- `` _ - -` ` JJ t- _ _ --' _ ---_ - _ 12 Cross sectional flow area, a (ft2) o o -4 o a3: / H/ //11'� . -' y - �\ / \\ `� H / S _ CZI ,MH -86 -/' ,' ,' 1 , \'\ ,_General construction notes for Stormwater Mana ement lans _ _ c v > E �; / / SEwEa / / , Pt�u -5 4;45 _ -'' /' /'- , 1\- \\ 1---'1. All dams and constructed fill to be within 95% of maximum dry density - 13 Wetted perimeter, PW (ft) = � M N / 5 c, / ___ ! /_�/ ,' - \ `' -1 and /_ of optimum moisture content. All fill material to be approved by 14 Hydraulic radius, r = a /PH, (ft) > "- .E O /,. RwSP/ / - _ I / / I' `) \ 11' 2. Runoff \ �, M � M cu o / / / \- \\ \ (\ 111 // 1 II I \ /11 a geotechnical engineer. A geotechnical engineer is to be present during . 15 Channel (I e s (ft /ft) E / S'` / ' D.A #1 D.A. #1 D.A #2 D.A. #2 (Present) (Developed) (Present) (Developed) 2 -Year Storm 10 -Year Storm Drainage Area Description Frequency -years 2 10 n/a Rainfall, P (24 hour)- inches 3.7 5.6 n/a Runoff, Q- inches 1.07 2.40 D.A #1(Present) Runoff, Q- inches 1.65 3.22 D.A. #1(Developed) Runoff, Q- inches 0.50 1.44 D.A #2(Present) Runoff, Q- inches 1.76 3.38 D.A. #2(Developed) p I E m E � - / I I / / \ construction of dams. s 16 Manning's Roughness Coeff, n Z. o 'Z o a� r - - - j` I l !! / / I '� / ,, J/`�- _ - G I /'2. Pipe and riser joints are to be watertight within stormwater 17 V= [ 1.49 r2 /ss .s ] / n fa � a) L --- -- S --�� / _ _ - _ - , / / J -11 ' - - - F ____ - -s _-� - management facilities. _c 18 Flow length, L (ft) - -- - -- -- 11 \- ; 3• For temporary sediment traps or basins which are to be converted to 19 Tt =L /3600 *V 0.05 0.05 _ - - -____ /� 1111 / / / _ _ k \ 11 / , -- permanent stormwater management facilities; conversion is not to take 20 Watershed orsubarea T�orTt _ 4• - lace until the site is stabilize nd _ __ 11 a nd 19) 0.30 0.30 0.18 0.18 - - - - _ - - �� - "' p ' a �' (Add Tt in steps 6, __ _ �, _ _ _\ \,permission has been obtained from the County erosion control inspector. \ \ ` N M d' 1 N N LJ..1 J W Q U 1 W Q 0 N Z a D Q O oC w U') Q 2 a J J 2 W Y H U) W Z W 0 ^ a L.L.. � a O � c a J L 0 W -� W� L z W �� w �, w z art � z L.L. ° w a zaz � J L J o ,� m o o L � 3 O O V Z �° o � o a; W �� •L O 3 d W �' � L � a I r x V � o o � T •11.11 Z� E o 0 3 L c.� v� L z c rr Y w a w � wZ z °- w U z� J C 0 � L o � N L d W o Oa � o � a� > .n U O X � � V c � o w o J � O 0 JOB NO. � � o� ��zo�z •� 0 SCALE ° •� c � o � SHEET NO. a o 25 °' �o Project: Westlake Hills Designed By: KKW, PE Date: 5/14/2013 \`_ -- / / 1 ! ! /J \_, \ - - -' __ -' gee / I t 1 �I I II ( ( I ( 1111 \`\ \ \ \ \\ \`�- 1`1`11 sao - -~ - - - _ =_ ; \ 1 \\ \\ \"' \ ___ - -' / Location: Crozet along Future Connector Road Checked By: KKW, PE Date: 5 14 2013 i / / / / _ - - -`' - /� �' I III I I ( j I I I / tl \ \ \ \\\ \\ �- - -' \ \ -- � ; __ _ -� \ \ \\ \ `--.- /' / l \ _ / / I / / !l - _ - J / ____ - - -' / '''� 111\!' I I 1 I I / 11 \ \ \\ \ \ ^\ �, _ - _ '- - - - \ \\ \- / / 1 / �L"'` /. -- - -- \1111 / ' I ' ( 1 III \1\ \ \ \ \\ \ -1111 \\ r 1111_/ __- / /�\ \ \ /� J / - /l , l I I I J \` \ - - - - - - \ \ \\ \\ / Check One: Present X Developed X `- \t ! / / ! % ! \____ -- / / I 1 \\ \ \\ \-� , \ -- 70 _ -__ -- - - "`- - \ ` l- \ / / - / / I I ( II `\\ \ \ -_ 5 1 \ �/ 1111 / !/ / / / /! !�_ \`___ \`- -- _ // ' /! /I # I I I I 1 1111\ \ \ \� ��/ \_- - -_ - - ' _- - - - -- 1 \\ \ \\ - -_ -' 1111 Check One: Tc X Tt Through subarea n/a I l / _ _ -- 11 / /! l '�' I I \ \ \ \ _ \ -_ _, _ _ _ - ; - _ _ _ - ! / / / / /�_ _ ! l ! # a I I 1 \\ \\ \ ` - \ \\ - 1111, 1111 - '' ' I I I'/'/ 1111 \\� \\ 1111' 1111 I !'IIII l! l I I 1 I I )1\ \\ \\ \` - -'\ \_- _ -1111 _ /_� �_ __�_' -- \ \- \ \_-- 1111 \� - / l l / l ' 1111 �, - --` \ \\ 1111 1111 / l l \1 / 1 1 \ \\\ \� _ " ' - -' -� / - -- - -__- --__� \ ` / / / _ \ \ / 1111 / I T I 1 \\ - `�- - - ___ ` ! ! / / / / / \ \ \_'- / / / //! l l l ,I ll ' I / t\ \\ `\ \ 560 _ - \ 11 11 Se mentlD: - - -- -'� / / % 1 / !/ / // \\ \ \ /, 11,11/ / 4 / /\/ / \1111 - __ _ �`'---- ___�_= __1111'/'' g - __- _ S / / / / 11I / - --- \ \ \` -. /, / // // / I // / / // / / \\ �� \\ - - -\ - ,__' / /'� -1111 _ -' \\ _ - - -- 1111,/ Sheet Flow: (Applicable to T� only) -sce- - / r r / / / ,' / - -\ `\ ` \ / / /� / ! / / / ' I /� 1111 �, �� / /J / 111 \ \ _ `- - - _ - - / 1111 / _ - IrY J / / I I b I , / \ \ \ - __ f I / / / / / / - •11 ,` 11 / I 1 \ \ - / .' \ Dense Grass Dense Grass Dense Grass Dense Grass / ) / / / / - \ \ \ \ 11 , / / / ' / ' , 11I ,, / ) \ \ \ - - - -' 1111 -' _ `- _- / ' / 1 Surface description (Table 3 -1) - _ - , _ _ ,' ' \\ `\ \\ - ' ' \ 1111 / / 1 / ! _- / / / / / / / / ///i/ .. :•: �' / \ \ \_ _ _ .' / �o -o - -- 1111 - - - -� 1 / / \\ \ / / 11 / / / /�/ ` 1111 \ \ -- -- �gi3 ��o�o - -- \o !� '�� / 2 Manning s roughness coeff., n (Table 3 -1 0.24 0.24 0.24 0.24 �� \__. 1 / / I /- \ \ \\ \ / -/ // // / j// �, / / /� /� ,:.•...:.. ....11 ) \\ 9_- �- � , � , 3 Flow length, L (total L < 100) (ft) 100 100 100 100 ` � \t` _ I j \ - , , , / / / %/ / ; �_ % -� , / \ _ 11 I 1 / 1 \ \ \ \ _ - / / / / ' / / 1111 / '/ ' / �` / ' ' \ \ �' --e _ e .e / / \ \ \ / / // // .1 M.. / ,11 / � - \ '�/ ' 1111 1111 �:. •. ... / 4 Two -year 24 -hour rainfall, P2 (in.) 3.7 3.7 3.7 3.7 - . '��1 ■ 1( \\ - - -�11 Z / 11//. / ,11 \ 1111 / 5 Land slope, s (ft /ft) 0.02 0.02 0.06 0.06 _ °� 4 _ _ _ - �1 I I j \ \ - _ -1111 1111 %1111 i ' :PO f �D: �' /- _\ _ _ 1111 �8 \ \ . / / i/ / 11 , . \ / / �, \'_ _ - - -' / I / I / ® \ --- -- 1111/// /- .:� . / \ '\ / / 6 ComputeTt= [0.007(n *L)os] / Pz s S .4 0.22 0.22 0.14 0.14 - \�\ v:` - - - -' / / \ ' - -- W /��i /;, \\\ / / -' \ �'�. \ "Y' 1111 1111 / / / Shallow Concentrated Flow: -- ,�` ` -\ x i I 1 /'� i/ �� - \ \ \\ \ - - \__ -- -11/'' "4 -\ \ ._/ I I __ . - 1111 / - / - 7 Surface description (paved or unpaved) Unpaved Unpaved Unpaved Unpaved `\ ` �\ \ \ 1 I I -_ \ J _ 1'_, ;' / 11 _ - - �- - - _ _ _ _ _ _ _ _ 8 Flow Length, L (ft) 486 486 680 709 - - ; _ `, \ \\ \ \\ _ - - / / I J //1 - - �- - 1111 /' �� ; • / / H - _ \ \, �WSA 1 c �E E S -- ---- -- - - _ - _ - - - - - - 9 Watercourse slo e s ft ft 0.038 0.038 0.138 0.082 se_\ _ \\ \I I - 1111 � / I ' 1111 ' / / / �' / �� I- "H= ` -F� M" s, ----- S p i ( / ) �- \',, 1111\`,- - -- / �i i /J r\ ' / / 1111 ! / / S 1111/' / _ \\ JI - CZI- MH -8�== __-�_ S 10 Average velocity, V (Figure 3 -1) (ft /s) 5.3 5.3 5.75 5 _ \ -,\ \ - % / - - - - - - - �I - \', \\\ - -! -- - I , // ,/ / / -Ft /11 / /i \ `� _ - - - - -- CZI -MH -83 - 11 Tt = L / 3600 *V 0.03 0.03 0.04 0.04 _. a _e _-8 --� -e- -e- \ �� _ _ = - - - - -_I- -' 1111 I / �cP SEw/ / / ' , mP OF \ _ _ - _ - _ `� - _ - - - \ _4" _ _ = g- Ste- 6-- C�� _ _ 11 11 / / �/ RwSP - - _ -' ,' ELE✓.�549.71' - \ - - - \ \ ` - _ _ - - _ - Channel Flow: o LL. o N/A _ ' -- - - - -- 5 - - \ -- _ _- `` _ - -` ` JJ t- _ _ --' _ ---_ - _ 12 Cross sectional flow area, a (ft2) o o -4 o a3: / H/ //11'� . -' y - �\ / \\ `� H / S _ CZI ,MH -86 -/' ,' ,' 1 , \'\ ,_General construction notes for Stormwater Mana ement lans _ _ c v > E �; / / SEwEa / / , Pt�u -5 4;45 _ -'' /' /'- , 1\- \\ 1---'1. All dams and constructed fill to be within 95% of maximum dry density - 13 Wetted perimeter, PW (ft) = � M N / 5 c, / ___ ! /_�/ ,' - \ `' -1 and /_ of optimum moisture content. All fill material to be approved by 14 Hydraulic radius, r = a /PH, (ft) > "- .E O /,. RwSP/ / - _ I / / I' `) \ 11' 2. Runoff \ �, M � M cu o / / / \- \\ \ (\ 111 // 1 II I \ /11 a geotechnical engineer. A geotechnical engineer is to be present during . 15 Channel (I e s (ft /ft) E / S'` / ' D.A #1 D.A. #1 D.A #2 D.A. #2 (Present) (Developed) (Present) (Developed) 2 -Year Storm 10 -Year Storm Drainage Area Description Frequency -years 2 10 n/a Rainfall, P (24 hour)- inches 3.7 5.6 n/a Runoff, Q- inches 1.07 2.40 D.A #1(Present) Runoff, Q- inches 1.65 3.22 D.A. #1(Developed) Runoff, Q- inches 0.50 1.44 D.A #2(Present) Runoff, Q- inches 1.76 3.38 D.A. #2(Developed) p I E m E � - / I I / / \ construction of dams. s 16 Manning's Roughness Coeff, n Z. o 'Z o a� r - - - j` I l !! / / I '� / ,, J/`�- _ - G I /'2. Pipe and riser joints are to be watertight within stormwater 17 V= [ 1.49 r2 /ss .s ] / n fa � a) L --- -- S --�� / _ _ - _ - , / / J -11 ' - - - F ____ - -s _-� - management facilities. _c 18 Flow length, L (ft) - -- - -- -- 11 \- ; 3• For temporary sediment traps or basins which are to be converted to 19 Tt =L /3600 *V 0.05 0.05 _ - - -____ /� 1111 / / / _ _ k \ 11 / , -- permanent stormwater management facilities; conversion is not to take 20 Watershed orsubarea T�orTt _ 4• - lace until the site is stabilize nd _ __ 11 a nd 19) 0.30 0.30 0.18 0.18 - - - - _ - - �� - "' p ' a �' (Add Tt in steps 6, __ _ �, _ _ _\ \,permission has been obtained from the County erosion control inspector. \ \ ` N M d' 1 N N LJ..1 J W Q U 1 W Q 0 N Z a D Q O oC w U') Q 2 a J J 2 W Y H U) W Z W 0 ^ a L.L.. � a O � c a J L 0 W -� W� L z W �� w �, w z art � z L.L. ° w a zaz � J L J o ,� m o o L � 3 O O V Z �° o � o a; W �� •L O 3 d W �' � L � a I r x V � o o � T •11.11 Z� E o 0 3 L c.� v� L z c rr Y w a w � wZ z °- w U z� J C 0 � L o � N L d W o Oa � o � a� > .n U O X � � V c � o w o J � O 0 JOB NO. � � o� ��zo�z •� 0 SCALE ° •� c � o � SHEET NO. a o 25 °' �o 2 -Year Storm 10 -Year Storm Drainage Area Description Frequency -years 2 10 n/a Rainfall, P (24 hour)- inches 3.7 5.6 n/a Runoff, Q- inches 1.07 2.40 D.A #1(Present) Runoff, Q- inches 1.65 3.22 D.A. #1(Developed) Runoff, Q- inches 0.50 1.44 D.A #2(Present) Runoff, Q- inches 1.76 3.38 D.A. #2(Developed) p I E m E � - / I I / / \ construction of dams. s 16 Manning's Roughness Coeff, n Z. o 'Z o a� r - - - j` I l !! / / I '� / ,, J/`�- _ - G I /'2. Pipe and riser joints are to be watertight within stormwater 17 V= [ 1.49 r2 /ss .s ] / n fa � a) L --- -- S --�� / _ _ - _ - , / / J -11 ' - - - F ____ - -s _-� - management facilities. _c 18 Flow length, L (ft) - -- - -- -- 11 \- ; 3• For temporary sediment traps or basins which are to be converted to 19 Tt =L /3600 *V 0.05 0.05 _ - - -____ /� 1111 / / / _ _ k \ 11 / , -- permanent stormwater management facilities; conversion is not to take 20 Watershed orsubarea T�orTt _ 4• - lace until the site is stabilize nd _ __ 11 a nd 19) 0.30 0.30 0.18 0.18 - - - - _ - - �� - "' p ' a �' (Add Tt in steps 6, __ _ �, _ _ _\ \,permission has been obtained from the County erosion control inspector. \ \ ` N M d' 1 N N LJ..1 J W Q U 1 W Q 0 N Z a D Q O oC w U') Q 2 a J J 2 W Y H U) W Z W 0 ^ a L.L.. � a O � c a J L 0 W -� W� L z W �� w �, w z art � z L.L. ° w a zaz � J L J o ,� m o o L � 3 O O V Z �° o � o a; W �� •L O 3 d W �' � L � a I r x V � o o � T •11.11 Z� E o 0 3 L c.� v� L z c rr Y w a w � wZ z °- w U z� J C 0 � L o � N L d W o Oa � o � a� > .n U O X � � V c � o w o J � O 0 JOB NO. � � o� ��zo�z •� 0 SCALE ° •� c � o � SHEET NO. a o 25 °' �o p I E m E � - / I I / / \ construction of dams. s 16 Manning's Roughness Coeff, n Z. o 'Z o a� r - - - j` I l !! / / I '� / ,, J/`�- _ - G I /'2. Pipe and riser joints are to be watertight within stormwater 17 V= [ 1.49 r2 /ss .s ] / n fa � a) L --- -- S --�� / _ _ - _ - , / / J -11 ' - - - F ____ - -s _-� - management facilities. _c 18 Flow length, L (ft) - -- - -- -- 11 \- ; 3• For temporary sediment traps or basins which are to be converted to 19 Tt =L /3600 *V 0.05 0.05 _ - - -____ /� 1111 / / / _ _ k \ 11 / , -- permanent stormwater management facilities; conversion is not to take 20 Watershed orsubarea T�orTt _ 4• - lace until the site is stabilize nd _ __ 11 a nd 19) 0.30 0.30 0.18 0.18 - - - - _ - - �� - "' p ' a �' (Add Tt in steps 6, __ _ �, _ _ _\ \,permission has been obtained from the County erosion control inspector. \ \ ` N M d' 1 N N LJ..1 J W Q U 1 W Q 0 N Z a D Q O oC w U') Q 2 a J J 2 W Y H U) W Z W 0 ^ a L.L.. � a O � c a J L 0 W -� W� L z W �� w �, w z art � z L.L. ° w a zaz � J L J o ,� m o o L � 3 O O V Z �° o � o a; W �� •L O 3 d W �' � L � a I r x V � o o � T •11.11 Z� E o 0 3 L c.� v� L z c rr Y w a w � wZ z °- w U z� J C 0 � L o � N L d W o Oa � o � a� > .n U O X � � V c � o w o J � O 0 JOB NO. � � o� ��zo�z •� 0 SCALE ° •� c � o � SHEET NO. a o 25 °' �o I . -. r - � ___ I '' 1 I - _ - - _ \ \ 1 / / \ \ - , - - - _ I \ \ \ l I \\\ .- , \ \ \ \ \ , \ \ / \ \ \ / / --_., ` f \ \ � / J / ( / / // i / j / / / 11 / \\ \ \ / / „v / _- _ _ - \ � __ _ _ %_- --_ -•,;� �,- -___ _ _ _ _ \ \ \ / / \ \ \ \\ / / / \ \ \ \ \ � -- -\ '\ \ \ / . -_\ \` I f / / // / / //, O4�"`_""H l - - =_= - -_ -_ , _ `�. \ \, -____ _ - - -�- - -- _ =_ /- _'' _ -` �' - _ � __ -- __ \ \\ `\ , I\ `r \1 \� �� \� \�� \\ \\ \ \ \ \ / / / / / \ \ \\ \\ \ \ \ \\ r // -- - v \\ � \ - �� /` �j�� )I I I I I � j // / / / ��" - j / /// � \ - - -` _\ \\ - - _- - - - -'_ - - _ \- -� \ - -- - -- ---yip " \ \ \ \\ \ \ \ \.'`, \\ \ ' \ \� \\ \ `\ \ \ \ \ \ / / / / / 1 ' \ \\ \ \ \ \ ( / - \� \\ \ \ �/j J I I I / / / / ' l % J / - - -�� _� \\ - __ - - -- - _ '' - �- -`�_ \ �\ _ - zip - -_ \ \\ \ \ \•1 \ \ \ \ \ �� _ / �i \ \ \ I -� / / r I I / / �� / SC______ z+ ___ ' \ --`_�� \ \�\ --- -_ _-" - +- _ -- - - _ �� \ \\ \\\ \� \\ \ \� -\ �\� \ \\ \ \ r \ \ / / - I \ \ \ \ I / / \ \\ \ __ / / / / l / i /� / U r Tr / / /// / s �% � \ / - - - - - __ -,.I- 1�__ _ _� ` \ \ \ 1 \ i , -� - I _ �`` Y ~� \ . �.' _ \ \ \\ \ \ \ \ \ \ \ \ i \ , \ \ \\ \ \ �� - / / - I \ \ \ \ \ \ \` _ \ \ I \ - / / i / i _ / ./ /i LOL 1 LOl2. - \ \ \ \ \ \ 1 1 I \ \ I / / r \ \ \ \ \ . - -- \ \ / / / / / /� / / % / / -�- � _ � i`' _I- - - I I � Low: � � - _ � - � _ \\ \ \ \ \\ •\ \ \ � �\ I ` � \ \ \ / - ., \ \ \ f \ \ \ \ \ \ \ I / / \ \\ / \ I ( , ` � \ \ \ \ /. i _ 20062 SF' 07 SF 0249�SF \ \� \ \ \ \\ \ \ \ , \ - \ / r I --� \ \ �\ / ,_1 / / / // � ii / !. --- / \\ ( l// ? \7 f. \\ 1 I 1, \ \, ,, f/I /- / / r 1 I \ /I 1 I ; \ \\ \\\ 1 1\((I l \� \�� \� - --- // % �-, -''////- -- �/ \\ � ! ! ! / , � _ \\ \ \ / �•.. � I COT ; 4. \. � \ \ \ \ \\ \ \ 1 \ \ \ � .� -� ( �. - -� 20199 SF 1 1 \ \ \ \ _ \ u, I I I __ .-,_ - __ ( / /� / / / / /ice_ - - - / 11 IF \ \ f \I/ / y I I �I \ I \ '� I/ i '' -� * I A \ 1. \ \ \I I r I \ \ \\ \ - s9 _ _/ / / ' / \ \ -' / f I .._ _I ._._.� . - f �r \ . \ : \ r '; \ , . \� \ \ \ \ \ \ i 'I III I / 1 \ \\ \ 1 I \ \ \ \ / / r - / r \ \ \ \\ \ \\\\ / / / / / /�,, � • ' 1. \ ( ! \ / \ /'I y .t, - - - - c_ .. :... ` \ 1 1 1. \ . \ \. \ \ \ \ \ \ \ \\ 1 /' \ \ \ \ \ \ \ - - - - - _ / I r \ - - / r I \ \ \ \ \ (\ \s8 \\ \ \,_ / / / // �// _ - `� - ' '-- I i ��/ \ `.... f ILO 1 C \ \�\ \ \\ \ 11 \ \ \ \ \ \\ \ \� \�- - - / \ I / I I I r \ \\ \° \ / _ -I -- / / 1 \ - .... \ / / /- // -/ \ - .�\ I \ \ I \ \ \ \ \ \ i '� \ / 20 04; S\ \ \ \; \ / r i \\ \ \ \ \ \ / / % / \ \` \\\ /_ / S � / J i \ \ � / . � �:tl ,. \.\ \` \ \ / \ \ \ \ \ \ \ \�\ \ \, \` 1 \\ V", , / -__ \- / \ I Z--, -- I ) I r �\ \ \\ \ 1 S>>S�\�\ / / _- __ � / / \ \ \0 \ ; '.'.t.,. - .'.'.'. 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' ,,,r�� i '0,00 / / _ I > ` � / ?'l /�• /'ice / �� / // , tELD VERIFIED- F POND CROSS SEC �FIOfV� #3 EXISTIN3� A \ Q \\ �� \ €X 30" BARREL TIES INTO _ L= 71.80'' S=\1 5 °Ia> \ \ „ /' \ \ \ \ \ PROPOSED 36 CULVERT #1 // / , %� %__ -� / -��i / 4 1, INV IN: 595.14\ :; \\ \\ SEE PROFILE SHEET 20 ° ' `-- - - - - - -- - j� / '/ / INV OUT: 594.OQ` \� / --� / EX FIELD -VE �IFEID -� €X OND CROSS SECTION42 �- 'Y 11.2' INSTALL 5 -6" ORIFICES / , / _ /' // ,'/ ' 3.9 AT ELEVATION 606.00 _�� `\i` .,.,:....., :. r . � 12.2 STORMWATER \ \\ `•,<\ . ��_ �':::Y � t f`x �x ,�. '� ,:� :.. �' -_ -- / _-- - -- ,� MANAGEMENT FACILITY #1 \ \\ _ . , EXISTING POND C 10.9' \ /!.. ' ' .. % . -FIELD- VERIFIED_ 9,9' \ i .. I..r .....' j' RETENTION BASIN 1 E IS ING'.6.0. ".F�ERlAT'ELEV � EX POND CROSSE6TIGN #1 \.. .........i .. I .. �... , ..i. .... ). i �- i........ .'.'.'.'.'. ... ....... i \. ..'........� ..... ................�.............. 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D.A. #2 17.13 ac. 7.25 3.98 11.98 12.51 E = 26.88 ac. 12.65 24.55 Z = 26.62 ac. 11.23 24.49 Short Version BMP Computations For Worksheets 2 - 6 Albemarle County Water Protection Ordinance: Modified Simple Method Plan: Westlake Hills SWM Facility #1 Pond CZ Water Resources Area: Development Area Preparer: KKW, PE Date: 05- Feb-13 Project Drainage Area Designation DA# 1 L storm pollutant export in pounds, L = [P(Pj)Rv /12 ] [ C(A)2.72 ] Rv mean runoff coefficient, Rv= 0.05 + 0.009(1) 0.48 Pi small storm correction factor, 0.9 9 Contour Areas 1 percent imperviousness inflow (cfs) 49.092 at 12.02 (hrs) P annual precipitation, 43" in Albemarle Pre Past A project area in acres in subject drainage area, A= C pollutant concentration, mg /I or ppm target phosphorus SCS f factor applied to RR 600.00 V required treatment volume in cy, 0.5" over imperv. area = A(1)43560(0.5/12)/27 name: 2 -Yr 24 -Hour SCS storm event RR required removal , L(post) - f x L(pre) 602 ^00 %RR removal efficiency, RR100 /L(post) Area (acres) 31.76o Impervious Cover Computation (values in feet & square feet) 604.00 Item CN 77.9oo pre- develo ment Area post - development Roadway (includes Sidewalk and C &G) subtotal inflow (cfs) 96.112 at 12.02 (hrs) Roadway (includes Sidewalk and I 145,348 145,348 discharge (cfs) 11.982 at 12.62 (hrs) Residences Length Width no. subtotal 45866.00 8573.7 Residences Driveway 612.00 61o84.00 12521.4 time increment (hrs) 0.0200 storage (cy) 965o.982 Driveway 78078.00 17662.7 time limit (hrs) 30.000 Sidewalks loo -Yr 24 -Hour SCS storm event Sidewalks 606.00 Vol. c) (Y 3365-97 routed true inflow (cfs) 191.232 at 12.02 (hrs) 4 Outlet Structures 135,493 Homes 135,493 Homes Weir Gravel areas Area water level (ft) 612.895 at 12.30 (hrs) Curve name: Notched Weir Gravel areas storage (cy) 14666.598 name: Anti -Vortex Device x 0.70 = 0 Actively- grazed pasture & Area side angle 0.000 Actively- grazed pasture & yards and cultivated turf 954,085 x 0.08 = 76,327 yards and cultivated turf Active crop land Area Active crop land x 0.25 = 0 Roadway Sidewalk subtotal multiple 1 I Roadway Sidewalk 0 discharge into riser Impervious Cover : -- Outlet structure 1 I(pre) Rv( oast) V 0.48 -913 9 Niour Ploaiclnnrr•cnt Mituatinn 11 Area Width no. i x 0.70 = Area 782, 649 x 0.08 = Area x 0.25 = (EXISTING POND C) Routing Method: storage- indication Basin Input Data Inflow Hydrographs z -Yr 24 -Hour SCS storm event 9 Contour Areas 3 Inflow Hydrographs inflow (cfs) 49.092 at 12.02 (hrs) Elevation(ft) Area(sf) Computed Vol.(cy) Hydrograph o discharge (cfs) 7.246 at 12.54 (hrs) 598.00 595.00 0.0 SCS water level (ft) 6o8.6o2 at 12.56 (hrs) 600.00 4349.00 161.8 name: 2 -Yr 24 -Hour SCS storm event storage (cy) 6407.780 602 ^00 10712.00 702.2 Area (acres) 31.76o Z O F- o- 604.00 17982.00 1753.4 CN 77.9oo 10 -Yr 24 -Hour SCS storm event 606.00 25792.00 3366.0 Type z inflow (cfs) 96.112 at 12.02 (hrs) 608.00 34715.00 5598.8 rainfall, P (in) 3.700 discharge (cfs) 11.982 at 12.62 (hrs) 61o.00 45866.00 8573.7 time of conc. (hrs) 0.3000 water level (ft) 61o.6o6 at 12.62 (hrs) 612.00 61o84.00 12521.4 time increment (hrs) 0.0200 storage (cy) 965o.982 614.00 78078.00 17662.7 time limit (hrs) 30.000 fudge factor 1.00 loo -Yr 24 -Hour SCS storm event Start_Elevation ft () 606.00 Vol. c) (Y 3365-97 routed true inflow (cfs) 191.232 at 12.02 (hrs) 4 Outlet Structures Outlet structure 2 peak flow (cfs) 49.378 discharge (cfs) 63.o91 at 12.30 (hrs) Outlet structure o Weir peak time (hrs) 12.010 water level (ft) 612.895 at 12.30 (hrs) Curve name: Notched Weir volume (cy) 7010.917 storage (cy) 14666.598 name: Anti -Vortex Device length (ft) 1.5o0 multiple 1 side angle 0.000 Hydrograph 1 Invert (ft) 612.000 coefficient 3.000 SCS name: to ( r SCS storm event discharge into riser invert (ft) 61o.000 Area a (acacresres) ) 31.760 file: sixty.txt multiple 1 C 729oo discharge into riser Type Outlet structure 1 rainfall, P (in) 5.600 Culvert Outlet structure 3 time of conc. (hrs) 0.3000 name: Barrel Orifice time increment (hrs) 0.0200 multiple 1 name: Mid -Flow Orifice time limit (hrs) 30.000 discharge out of riser area (sf) o.196 fudge factor 1.00 D (in) 30.000 diameter or depth (in) 6.000 routed true h (in) o.000 width for rect. (in) 0.000 peak flow (cfs) 96.672 Length (ft) 71.800 coefficient o.6o0 peak time (hrs) 12.010 Slope 0.017 invert (ft) 6o6.000 volume (cy) 13725.915 Manning's n 0.013 multiple 5 Inlet coeff. Ke 0.500 discharge into riser Hydrograph 2 Equation constant set o SCS Invert (ft) 595.140 name: loo -Yr 24 -Hour SCS storm event Area (acres) 31.76o CN 77.9oo Type 2 rainfall, P (in) 9.100 time of conc. (hrs) 0.3000 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 192.346 peak time (hrs) 12.010 volume (cy) 27310.236 subtotal 366,709 366,709 subtotal 234,1081 234,108 0 62,612 0 btotal 0 © • • • • - ' • K A '3. 3 i ,i.- W I•-- Z O F- o- * min. values I(post) Area of Elevation Forebay Volume 4' WIDE FOREBAY TOP (ft) Contours (cf) OF DAM ELEV.= 612.00 (sf) 608 1190 0 609 1539 1,361 610 1913 3,083 611 2313 5,193 VDOT STD. EC -1, CL. 1, RIP -RAP LINED 612 2738 7,716 (45'Lx14.25'Wx2.5'D) EXISTING RETENTION BASIN #1 FOREBAY REQUIREMENTS: N Forebay Volume= 0.25 inches per impervious acre Forebay Depth to range from 4' -6' Impervious Area Capt 1.54 ac. BOTTOM OF FOREBAY Forebay Volume Required= 1402 cf 608.00 Forebay Volume Provided= 5193 cf FOREBAY OFFXISTING RETENTION BASIN #1 (NOT TO SCALE) °ROPOSED TOP OF =OREBA Y IND TH= 4' AT 4N ELE/A RON= 612.00' 0 0 Qforebay = Qpipe + Qoverland Qforebay = 14.0 + 2.1 Qforebay = 16.1 cfs Roughness Coefficient = 0.069 Channel Slope = 0.25 ft /ft Left Side Slope = 2 ft /ft Right Side Slope = 2 ft /ft Bottom Width = 20 ft Normal Depth = 0.21 ft Velocity out = 3.75 ft /s Non Erosive Velocity = CHECK sriLL WA r-- `- PROPOSED EC -1 W =20; D =1.4, ELEV = 611.00' CLASS Al LINED d50 =,; SPILLWAY FOREBA Y SPILL WA Y OFFXISTING RETENTION BASIN #1 (NOT TO SCALE) POND C DESIGN FROM WESTHALL V LOTS 93 -125 A STONEHAUS DEVELOPMENT FINAL SUBDIVISION PLANS, REVISED 2 -7 -2011 AND APPROVED 2 -17 -2011 (WP0201000062) NOTES: 1. POND EMBANKMENT WILL BE REGRADED FOR GUADALUPE ROAD ABOVE PREVIOUS TOP OF BANK ELEVATION. CONTOUR AREAS ARE NOT REDUCED. 2. EXISTING 60" RISER TO BE MODIFIED WITH 5 -6" ORIFICES DRILLED AT ELEVATION 606, TO PROVIDE LOW -FLOW ABOVE THE 3xWQV SURFACE. 3. NEW WATER SURFACE ELEVATIONS: 2 -YEAR WSE = 608.60 10 -YEAR WSE = 610.61 100 -YEAR WS E = 612.90 4. POST - DEVELOPMENT FLOWS DO NOT EXCEED PRE - DEVELOPMENT FLOWS AS DETERMINED PER POND C DESIGN FROM WESTHALL V LOTS 93 -125 A STONEHAUSE DEVELOPMENT FINAL SUBDIVISION PLANS, REVISED 2 -7 -2011 AND APPROVED 2 -17 -2011 (WP0201000062), HENCE THE EXISTING OUTFALL CHANNEL IS ADEQUATE AND NO CHANNEL ADEQUACY DETERMINATIONS ARE PROVIDED AT THIS OUTFALL. PRE - DEVELOPMENT POST - DEVELOPMENT 2 -YEAR FLOW: 9.77 CFS 7.25 CFS 10 -YEAR FLOW: 13.92 CFS 11.98 CFS 5. WATER QUALITY VOLUME TOTAL OFFSITE (WESTHALL) IMPERVIOUS AREA: 357,168 SF TOTAL ON -SITE IMPERVIOUS AREA: 306,261 SF TOTAL IMPERVIOUS AREA: 663,429 SF RETENTION BASIN 1 - 3xWQV REQUIRED: 3 x (663,429 x 0.5 x (12)) = 82,929 CF WATER QUALITY VOLUME PROVIDED: 90,881 CF (3.3xWQV) 0 SCOTT R. 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T 0 L 0 co 0 n o 6 �Z ory �w w Z a� 3z aw o z a� �o o 0 0 o: 0 U �) 0 L o � y� 0 a x 0 0 0 �0 rY ,J 6 .D _ •0 L n 3 J � 0 U `0 0 U � C 0 v U y � C y o 0 y� �E 0 0 v n � n, 3 •� ' 3 U j C n 2� 0 1) ll C - 3 -_ T - / \ \ -- /� \ - / NOTE: \ SWM FACILITY #2 - SWM FACILITY #2 DESIGN 1__'1 � _ � - - - - -- / . SWM FACILITY SHALL MAINTAIN 50' BUFFER FROM STREAM AND CREEK. \ � � , 11 � \ \ / - - _ - - -- D.A #� / - -.-1 f it i ; ; I Il , �.,....,:. r__ . \,.,... \ � (NOT TO SCALE) �/ /r_ -� \_ - .. - -____ // tI l ' I I ",(' I I ... `.'...F /... I \.....\ .. \.. \ \\ �\\ \ �11 /' \\ �� I '� . ' ' ' �.'.'.'�'.'. \ /. ��, __ - -- r r ' I r ( 1`r I i . r.' I .'. �'.�' \. \ _` - -' ---- - - - - -- - t __ - r I I I I 1 .. ....\ \...\....�. �\ \ ` \, 100 YEAR - -. \ LOT . ,4O / I ; ; I ; I I I I '.'-'I :( �..'.'.'.'`'' \:�:��..\ ...\ \\ 11 \` / - - - w. r I. / - - - - - -. ,� , , I I I �, I I / ... ; ... .�...1 .....I'.'. \'�. '��.'..... '.'.. \ - /- \ Q - - - --- SE.= 558.231 - 2- - . 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A\Y (.WQ�.'.'.. = 3,032-CF- TYPE B RIP -RAP LINED I /' - �\ 1 -- / <' / �/ // � / / /r '1 ;4- i ... P POS§ED.. t)F\tEBAY. WQ =3,047 CF \ __ � W/ GEOTEXTILE FABRIC / / / - - / / -� - L -� . -L rl I , , / i MIIV. URF C .AREA. \'.' ' 7 278 SF I / . / . / / r r r > .. • .... L - - - - UNDERLAYMENT N I / / _ / , , % , / / ,� PE -OP ED S FACE•AREA' 7,773 SF \ 15'LX9'WX2'D I � - � / / r: ,.. . \ ...... . ,..: - / \ ` / , VDOT�STD( T _ _ _ , / , i i ` LO,T ., ,39� I�. \.. \.. \ , / \ -- C -1�C / ,ASS t1 RIPRAP / / / \.. \ .. / / / E L/ / '\ (. I . / -\ \ \\ . 'Z0047 SF / W.,=4 5'"W2= 18/5';L =17;D //� /� .! ... . \.. _ ,/ �� l /// ' \\\ \\ \\ , '. ' / . / / / /� / :' \i 2. EA = ....... 9 BOTTOM OF FOREBAY / \ ' ' / / / / , /� % ' / �0- EAR SE - 557:39 /. / / \ // f/ ,� , , f / ,� /., , \. \ _�- ,� 553.04 ,. I� . /// ' r - \ \�- - `\ �/. , . ./ . f / / i / / , i, 100- A .'. SE` 5583 ----- - - - - -- i �. i / / / 37' % �.. SWM FACILITY #2 RISER STRUCTURE Routing Method: storage - indication Basin Input Data 6' WIDE FOREBA Y TOP SEE DETAIL z -Yr z4 -Hour SCS storm event 7 Contour Areas � -OF DAM ELEV.= 556 inflow (cfs) 13.092 at 11.96 (hrs) Elevation(ft) Area(sf) Computed Vol.(cy) CLEAN -OUT W 10' WIDE TOP OF DAM discharge (cfs) 3.982 at 12.18 (hrs) 553.00 679.00 0.0 WA TERT/GHT / ELEV. = 559.25 water level (ft) 556.36o at 12.18 (hrs) 554.00 7291.00 125.9 storage (cy) 867.488 555•oo 8285.00 414.1 3 OF PEA GRAVEL CAP 50' 0. C. 6.00 SHALL BE PLACED 55 9338.00 o8. ELEV. = 554.50' 9.25' MAX. EMBANKMENT HT. so -Yr z4 -Hour SCS storm event 557.00 10578.00 1108.8 BETWEEN THE FILTER (TYP•) inflow (cfs) 25.101 at 11.86 (hrs) 558.00 11492.00 1517.4 MEDIA AND THE CONCRETE PRINCIPLE discharge (cfs) 12.512 at 12.12 (hrs) 559.00 12435 00 196o•4 UNDERDRAIN MEDIA SPILL WA YIWE/R, SEE Mater level storage (cy)7 4iz9g•1931z (hrs) y) 0.00 Start_Elevation(ft) 553.00 Vol.(c ABOVE FOR DETAILS 4 Outlet Structures Outlet structure 2 N, A � loo -Yr 24 -Hour SCS storm event SLOPE ° \ inflow (cfs) 49.12o at -=96 (hrs) Outlet structure o Curve L E . discharge (cfs) 42.635 at 12.04 (hrs) Orifice name: Riser \ ' water level (ft) 8.z 1 at 12.0 hrs name: Low Flow Orifices multiple 1 > 0.5 OF ( 55 3 4 ( ) N 0' 5 � - I- \ storage (cy) 1616.519 area (sf) o.196 Invert (ft) 556.930 I �l + + I � L + + Ir f r r n ... G diameter or depth (in) 6.000 discharge into riser x \ DEPTH width for rect. in fife: thi bct ,.J�.. t a,. \ () 0 000 rty �. (•'tiF; _N \ coefficient o.600 �. ,. ., t, ,. r Outlet structure .IN.' % ._ v t e I%i invert ft o0 . a :, -�k ,. () 555 0 3 ' 3 I \ \\ \ / / / / / // / / / , /8 NS i /' / . . • ,.-i �._ �� „�. �. �.. f3- a. '.... '.,4 45'.'...'.' ;�............ ( I _ / / / / /'/ /. j / / , - $ - �: =® 13.92 10.63 MIN. Scientific Name Common Name Caliper Size 10 -YR 1. I . I . I . I I. i . 1 . . _.- - / / / , / / , / / /�_ _, 0 ____ ,', X\ ./ / /' , � �,,� Z • / , ', ^'+'f ... ......... / /' .. .......... \........ .............................�� ...... .... -- - �. • • • ... • ... ,i . • • ....... • ... .. \............ ............................_�_ BOTTOM OF BIOF/LTER-` . . / 1 . i ! �, / I. / , , % i �,. // / ,' 'I- - , / �� , , ;� .. .. ... / 19,986 550.00 MIN. , / ' / i / . \ `\ - - / X , _ ' ', I , / Z / ' / / 11 5 f _ / , ;' ' ' ' ' ' ' ' ' ' ' '.' . /. /b . '.'.'.' UNDERDRAIN GRA VEL- 11 \ \ �� , / / , / , / / - ' ' PROPO Dz30" 5E T. ELEV. 556. / / ! 1 / � \ -- -�� / / / , , / / ,/ \ , PRCaP05ED 6�PER�OI�A ' ' ' / ' �' WITH 4 -6 LOW -FL �W •O FICES. AT I . 555.00 / . //�� / // c \'� �`�. - �' S_CHE6ULE,40 PVG,IPIP ��, / - / �. ��. ...... '.'.'. /� - - �' ' - - � - - - - UN `ERl5RAtN- SYSTEM/ ,' / , / `. ,,. ' . . ' .......... / _ --- ' / i IL_ . , .:\ / _ - - SP?At,E[[A_`2t�0,C./ ; � / '. PROPOSED 5% BARREL .'.'.' .'. 11 _ ' ' L =46.7 , S= 0.5 °/a - ........... � (I __- / ;` . N. 56 INV OUT: 549.96 \ �., _ - _ V - - -� /: I j i /'/ / //' /..�� -' , "' '/ `� j `\.'.' .N' \.1.... , PROPOSED HANS0 �.... . �, /. ...� /. �� .. �...�� / / - _ -� /' AN77- VORTEX DEVICE, SEE . � ' .... � - I 1 ..... .... � � , ! .. ... � . % : ,' - / -- _ I ... . - - _ , THIS SHEET FOR DETAILS ��'...\'; .. \`....... I .I.......'.I. _ Y'�-'.� ...; ..`1'% j ./...,!. y! , ;. ,' . \�....... - -� - - 30 RCP RISER= 556.93 \. I . ./.i /. I ./. . /.� ,. ..,.. y. / �` V'..,.I., `y;,y.. / \ , 11. �'.'' '.'...`'....'.... / / ,' .i :.l. ; ' <.�'�.'..'. ; I ...�.,. I ./ // / �P- (EG��, __ - _ ... I ... ..... �\.' `RWSA.1- .'.'.'..'C:.... ..... . \ '�. i..'l' ...... -. .� .. ,/ .... , . . ' /.. 11 / / a`° / oRM FP -1. *. ��.� == :�- .-'� --- ..... -' \. - _ ...../ ............... " �... l ..l.'..... ��% .. % /' _' /...i... ' /... / /,: / S� N� .T ........ . = .--.. . -_ ..... --- 11 ., . %,;. , __ _ ''`'' _ \ - 4 -6 LOW FLOW OR/F/C .. ::° � . \.'.�'. \.'....'' ... ��......�../ ... /� !`'.'.... �.... /.... / ;;::: / CjG '(E !.'..'.. �.\ .....'.�'.. '.. AT ELEVATION 555. �.�\ .��....._._''.�. . .. � �.� < - �. \ �... - ....� /....... � // MPNP ,5�01 �� ....... y - - --,\` `..... /I... ..'. ..'.'.'.'.'.'.'.'.'. ..'.'.'...'.'.........'........ TRASH RACKS SHALL \. - .�._ - - .-- ..�y...� .. . -\ ... /....., l /' / .,. - - �\., �•.....'.'. INSTALLED ON , .. 1\ �.�`�.�'� =.= ,. '...1. �.= !.... /!' l , ,t c�� ,� / ......... .> ,- \ �.'......... ORIFICES /N ACCORDAN � �..��__._ _ - �_- i i ... / / �F �/ i, / \ .......................... . _ ;.'.'� �. 1 �! / / / C� '% i. \ - w/VSMH CHAPTEF --- _._� =='-L .-_- -- '/ Ii \1 GP �'' ;�. / I TDP OF /NG _- `.'.'..'. 1. __ -r _---�.-: - . ___- - - - -_- \/ ,/ /J 5 �'' , //' MH RWSA CZI ¢ -85 - . -.. -- ..�'�.'.'.'.'.'.'.'.'.'.'.'. 11 . "� ~_.:-�._ -- 8i�- .'-0- '.'- ..�.'...... /�' / / s. �` ;.:PROPOS ' EA HEN . .'.'.'.'...'. '.'ELEV: - '549:.71........ _.'...- .._. - -. -- ......... -- •_.- --...' __... / / SWM CES.....A.. . ....y / -- -- -- / ............ EMERGE l SPI . ........ ............................... / / r �, �' .� - \ _ R / - r � ` _ _ TIN, ...... ........ • • • • • • ...... • / / � � • • • y' �' • � � • • • • .. �\ I ........\ , PROPOSED VDOT- STD-. EW -1 AND •VDOT � \ / 6 X6 „ " / / / .. . �....'.'/. ...'.'.'.'.'.'.'.'............. I ( ....... .. 0" 0X18 / / �� i'-A` .. I ............... \ _ ....I......'.�.EC -I. CLASS A.'LR(PRAP..W /GEOTEXTILE.FAB.. / / viH r.'.'. \ � CONCRETE / .... ..... , ......... /.... \. 1' .............. \� ....... ..........y %...... UNDERLAYMENT. REQUIRED' .�.'.'.'.'.'..'.'.'.'.'.-.'..'. / / / / S- _ �ZI - M H - 86 -- '...'.'. , ....'.'.'.'.'.'.'.'. ;........ , \' '.'.'.'.'.'.'.'.'.'..' ' � ...... - -_ _ _= = -= _ MULIT -STAGE RISER �-,��, _ - / / / / TOP; _ J .�. .. J T �.......i ............. /....... \ 4\............ " I * ' I'' '' 11/V1. =7.:5'.;.11112 =1:$.S;�L =.1.6 ,. D =1.4 ) ::::................ . :' / / _ \ NOT TO SCALE' FZ_ ; ............., ___�. �u a. • „.::<. d:,,� ��:'a \ multiple 4 Weir t�`-1 v discharge into riser name: Emergency Spillway , * -_ length (ft) 7.000 ELEV. = 554' \ - Outlet structure 1 side angle 63.000 -24" RCP BARREL Culvert coefficient 3.000 46.7 LF @ 0.51 name: Barrel invert (ft) 557.500 multiple 1 multiple 1 6" PERFORA TED SCHEDULE 40 UD INV. ELEV. = INV. OUT= 549.96' discharge out of riser discharge through dam PVC PIPE OR EQUIVALENT AAA2. 550.20 MIN. 6' WIDE & 7' DEEP D(in) 24.000 1.01 SLOPE (MIN.) TO OUTFALL STATE APPROVED MIX. TOP ELEV.= IMPERVIOUS CORE & h(in) 0.000 Length (ft) 46.700 PIPE PROVIDED ACROSS ENTIRE 554.00 (TYP.) DEPTH= 2.5' MIN., CUTOFF TRENCH WITH 1:1 Slope 0.005 WIDTH ® 20' 0. C. SLOPE= 0.001 SIDE SLOPES. Manning'sn 0.013 Inlet coeff. Ke 0.500 BIORETENTION BASINS Equation constant set 3 (NOT TO SCALE) invert (ft) 550.200 / \�l / . :'. a. '.... '.,4 45'.'...'.' ;�............ /'....... ................ D.A. #1 28.35 ac. D.A. #2 15.35 ac. �........... .'. _ �..... ............................... \..........\.'.'.'.'.'.'.'.'.'.'.\'.' .'...'.'.'.'..'.'.'.'.'.'..'.' 13.92 10.63 Abb. Scientific Name Common Name Caliper Size 10 -YR 794 Total , ................ /... ................;.... 1 841 \........ .............................�� ...... .... -- - �. • • • ... • ... ,i . • • ....... • ... .. \............ ............................_�_ 1488 3 174 556 9338 19,986 557 CANOPY: Quantity 1 Canopy , ;' ' ' ' ' ' ' ' ' ' ' '.' . /. /b . '.'.'.' 42,463 ' -, :' '..:'. �\.'.'.�:':�.'.':':':':':'::,:' ':':'::'.'.'.'.':'.'.'.'.':':':'.'.'.,.' :'.':':'.'.'.':'.'.'.'.':*:...' ':�:'.'.':':':' '.' '...'.'.' ' '.'.''' 'LF00.57. B/OF/LTER LANDSCAPI NG......'.'..'...'..'..'.'....'.'.' 3.0 IN= 550.20' �' Z ® )UT= 549.96' /....,. ,...�......\ .' l ............. / /..... .'.'.'.'.'.� ................... --. NSY N ssa S Ivatica Black Gum �� 2 106,726 181 8 X0.70= 1,448 .l�r..'.'.'.'.'... \ Q \............ / ............... ,� �, .l l.'.'.'.'.'.i.'.'.....' �'.'.'.'...'.'.'.'.'.'.'.'.'.' .'.'.'.'.'.'.' %.' .............. , / ;...... /... . {.'.'.'. '.'.'.'.'.'.'.'..�.'.'.'.'.'... /.'.............. , '.'.'.'.'.'.'.'.'.'.'.'.'.�!,.. 0 HVI Hamamelis Virginiana Common Witchhazel 21,606 6 113 13 0 1,469 .'.'.'.'....' ............. ... .. .. ... . .. ........ .'. \ ............... \ Roadway Sidewalk subtotal I .I.. I .'.,.�. .. ... .I.. ... .. ... .r � ..'. ,- ... .. .. /,% I. , I , ........... /,� , 1.'.......... ....'.'.'....•.;:........ 0 0 __ - Impervious Cover c +. -54% I(pre) I(post) U � � LV 1,426 .. ............... " " " " " " ":':::' , , ,....'.f..'.' .' 7..'.'.'.'.'.'.'.'.'.'. ,_� �, - ... r..... /. ' :." ' "� . �. �' , -' =/ ; --- 1 - Q Ul VBDN Viburnum Dentatum Arrowwood Viburnum 3' -4' 31 46 TOTAL I __ -__ ___ ._ ____ __. - -I -- -. - - -- . __._.__ __.._______ ..- __ i____ �._ ..- ._____ _I ._._._ __ Lu �- 4,343_ r {. '.'.'.....'.....'.'.....'.'.'.' I� / . !....'/.;%'.....'......'....'.'.... .'.....'.'.'..'.'.'.'.'t!��z, -' 1 a - - ' '' v + IIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Summary of Watersheds Pre - Development 2 -Yr Flow 10 -Yr Flow Post - Development 2 -Yr Flow 10 -Yr Flow D.A. #1 28.35 ac. D.A. #2 15.35 ac. 9.77 2.88 13.92 10.63 D.A. #1 31.76 ac. D.A. #2 17.13 ac. 7.25 3.98 11.98 12.51 E = 26.88 ac. 12.65 24.55 Elevation Area of Forebay Volume (ft) Contours (sf) (cf) 38,825 Contours (sf) 553 678 0 554 915 794 555 1185 1 841 556 1488 3 174 556 Z = 26.62 ac. 11.23 24.49 post-development Total Area of Roadway (includes Sidewalk and C &G) Elevation (ft) Bioretention Basin Volume (cf) 38,825 Contours (sf) •• - W.S.E.= 558.231' 553 678 0 554 1 - 7291 1 3,397 555 8285 11,180 556 9338 19,986 557 11494 30,384 558 12675 42,463 NOTE: THE POST - DEVELOPMENT IMPERVIOUS AREA CONTRIBUTING TO THE BIORETENTION BASIN IS APPROXIMATELY 145,551 SF. THE BIORETENTION BASIN SHALL BE DESIGNED TO TREAT 65% OF THE IMPERVIOUS AREA, THEREFORE THE SURFACE AREA OF THE BIORETENTION BASIN SHALL BE SIZED TO A MINIMUM 5% OF THE IMPERVIOUS AREA (5% x 145,551 SF = 7,278 SF). THE PROPOSED BIORETENTION BASIN SURFACE AREA EQUALS 7,291 SF. THE FOREBAY MINIMUM WATER QUALITY VOLUME IS CALCULATED AS 0.25" OF RUNOFF PER 1 ACRE OF IMPERVIOUS AREA, OR (0.25 x (12) x 145,551) = 3,032 CF. THE PROPOSED FOREBAY VOLUME EQUALS 3,174 CF. Short Version BMP Computations For Worksheets 2 - 6 Albemarle County Water Protection Ordinance: Modified Simple Method Plan: Westlake Hills SWM Facility #2 Water Resources Area: Development Area Preparer: KKW, PE Date: 05- Feb -13 Project Drainage Area Designation DA# 2 L storm pollutant export in pounds, L = [P(Pj)Rv(12 ] [ C(A)2.72 ] RV mean runoff coefficient, Rv= 0.05 + 0.009(1) Pi small storm correction factor, 0.9 1 percent imperviousness P annual precipitation, 43" in Albemarle Pre Post 1. A project area in acres in subject drainage area, A 6.2Q;> ', `... x,_,....6:67:; C pollutant concentration, mg /I or ppm target phosphorus f factor applied to RR V required treatment volume in cy, 0.5" over imperv. area = A(1)43560(0.5/12)/27 RR required removal , L(post) - f x L(pre) %RR removal efficiency, RR100 /L(post) Impervious Cover Computation (values in feet 8. sauare feet) pre-development Area post-development Area Roadway (includes Sidewalk and C &G) subtotal 0 Roadway (includes Sidewalk and C &G) subtotal 1 1 1 38,825 38,825 100 YEAR •• - W.S.E.= 558.231' ,-, Residences Length Width no. subtotal 0 Residences Length Width no. subtotal 106,726 Driveway Sidewalks Homes zo DURING THE � O x N _ __ '\ � Driveway Sidewalks Homes H z 0 (. EVENT 24" RCP BARREL o o w a In LU V) � w a cavil 'LF00.57. 7' WEIR COEFF. = 3.0 IN= 550.20' �' Z ® )UT= 549.96' t~ LL! SPILLWAY PROPOSED EARTHEN I. W ELEV. = 557.50' LINED SPILLWAY 106,726 Gravel areas Area EMERGENCYSPIIIiWAY X0.70= 0 Gravelareas Area Q x0.70= 0 Ili Z Actively -grazed pasture & Area yards and cultivated turf 270,072 x0.08 = 21,606 Actively -grazed pasture & Area yards and cultivated turf 144,994 x0.08 = 11,60.0 Active crop land Area x0.25= 0 Active crop land Area x0.25= 0 Roadway Sidewalk subtotal I Roadway Sidewalk subtotal I 0 0 __ - Impervious Cover c +. -54% I(pre) I(post) Aln.., r%n.,etnnnnnn+ I Gnr Movelnnman+ Arana axictinn imnarvinnc envor <= 7n0/.1 3�ta o. �9 .. : 9 ,,. S . qv „c gut �'�F� •tom ,", _ kl k i xF g q �4,�.�4� ,yr. •y.'' X �f..C. -.5 'Yf Sr 45�`:+. S�3 EYE •='^ '.yRc - 5p 2 & f0 -YEAR STORM EVENTS DO PROPOSED .. M NOT CREST THE EMERGENCY WD TH= 10'f ' . - - M SPILLWAY ELEVATION= 559.25' ® 100 YEAR •• - W.S.E.= 558.231' ,-, 1.019' OF � Z FREEBOARD `, * min. values Interim Manual, Page 70 rev. 16 Feb 1998 GEB PVC UNDERDRAIN, SPACED PER PLAN, SLOPE TO DRAIN BIORETENTION BASIN SECTION NTS Technical Bulletin 7 Minimum Standard 3.02 pipe miircrt 112" zinc plated hook attacbed with s /a' laxter L/0- din, haka 1% ur r *. \r\,-�* Isometric 1/e MWE plate .w. .r 1,a1•ted to &W-1 • XDP1 structural plastla with ) ith 2 -1 /8" hales and Ile ptaie I t"1 Manufect =ell by, plague i� Saluiiom Ina_ or egnaI 1 DJWT 0000 .` '' ';, shown with agttcaal plate .:" f .l r 11rDAT sld, aaaa, �pc'an EA -1 Ed. thick] H2 DP1/E strurtural plastic ppwKh Section manutacturkid by tPlzo lol Solutions lnG or equal 6/5" dim halt' %, If f i r. �r. .s• �. } _.. e•ta, EW -1 P STIC 00 "how ROW SOLUTIONS P.O. Box 4386 BMP DEBRIS CAGE Mufesta VA =004 INC. U3- 722-4ela �nnr pla*C- 3Adi=,oamt Perforated c( FOUNDATION DRAIN c: \3_01 -1a 4" SOLID PVC CLEAN -OUT PIPE. CLEAN -OUTS TO BE PROVIDED AT THE END OF THE UNDERDRAIN PIPING AND ALONG THE UNDERDRAIN SYSTEM EVERY 50' O.C. FIGURE 3.01 - la Homogeneous Embankments w /Seepage Controls • ' omogeneous fill !�,\/•`f \�',`�``� 4, min I t. , ut off trench -4 below suitable I material I Soil or rock L -_ _ _ _ _ _ _ _ J TYPICAL HOMOGENEOUS EMBANKMENT filter slots drain Sand, gravel or rock drain outlet 'Rock toe Transition filter CHIMNEY DRAIN I �Sorrrce. ,SC:SEraizineerinz Fictd fcrnaaal 3.01-3 BLANKET DRAIN fill or gravel '��ock or gravel drain ova -�-` 4 ?eo3, ba., Transition filter TOE DRAIN PF .. E� Inflow Hydrographs 3 Inflow Hydrographs Hydrograph o SCS name: 2 -Yr 24 -Hour SCS storm event Area (acres) 6.67o CN 79.500 Type 2 rainfall, P (in) 3.700 time of conc. (hrs) 0.1800 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 13.092 peak time (hrs) 11.970 volume (cy) 1576.292 Hydrograph 1 SCS name: to -Yr 24 -Hour SCS storm event Area (acres) 6.670 CN 79.500 Type 2 rainfall, P (in) 5.600 time of conc. (hrs) o.1800 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 25.101 peak time (hrs) 11.970 volume (cY) 3022.221 Hydrograph 2 SCS name: loo -Yr 24 -Hour SCS storm event Area (acres) 6.670 CN 79.500 Type z rainfall, P (in) 9.100 time of conc. (hrs) 0.1800 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 49.121 peak time (hrs) 11.970 volume (cy) 5914.122 srrt1, `` i.1. ' _ _ `" - le .� ra• .r � �v y ,sr�4 f F '.f ie 1 ,A i1 )f I ,el,, 1 tiJ t r 0 r '� � �� r, -';4.'r _r.e � / �, , ? �� __,, .�.+` t: ar ki trrt Q .. ��` Fw"& 00ta� SUL C lrn Top,%+ .� _ ECup _D_ I IM �smalm - Maim ,) 1 ,. " ,. 7 . . . ( 4 Arid -'4?�a W 4r ? a R� MIM4i M14. P >�st@t dim C,9 C3: (2.)' ' Xrr� a vtiXe cl to t *mxlsil� xar # of AS-311 GG& IPA i cwt [J"4r�;z�'laayve•vn dmim I . mod 6m A0,14�4r vAnt Cdr e��Yser l b.l (4.) L* 16 fM r TMA 48 's t'..9" E` I . ,C�LEn4eMtW n ft4_V"rR ib t o . IQl riL15i1 °2 )1,a Y�C"a.5 X. lfit7-51Yi5f F � nirtutts. ` sk*W1 m, %r',a- e�lpippp,„a,g•,- -emits ! p':e.i, G;Qa t' cr ,crea , 4 "Iml '1,`n'»Gatti�! rsrlriak�i r>i ."*i,,l mi Fftrax c mta &,I �V aIDr ,trw LCL rismrc,ar?s 'b1mr- ` • '. - Pr w=t A01 -Va"ex �►l vkm (reap and PJwr) M1 1✓A 1 14,1 (!Pl� 11 �'O,el�,H 0-" ��,� SCOTT R. COLLINS-, ,U No. 35791 � �� o��SSIIONAL ��"; Z O a U M w ° Z O in > LU o` V w Z o° H U) H W W 2 & f0 -YEAR STORM EVENTS DO PROPOSED TOP OF DAM M NOT CREST THE EMERGENCY WD TH= 10'f AT AN M SPILLWAY ELEVATION= 559.25' ® 100 YEAR in W.S.E.= 558.231' ,-, 1.019' OF � Z FREEBOARD `, zo DURING THE � O x N _ __ '\ � 100 -YR STORM H z 0 (. EVENT 24" RCP BARREL o o w a In LU V) � w a cavil 'LF00.57. 7' WEIR COEFF. = 3.0 IN= 550.20' �' Z ® )UT= 549.96' t~ LL! SPILLWAY PROPOSED EARTHEN N W ELEV. = 557.50' LINED SPILLWAY W Ol EMERGENCYSPIIIiWAY o T TO S A Q PVC UNDERDRAIN, SPACED PER PLAN, SLOPE TO DRAIN BIORETENTION BASIN SECTION NTS Technical Bulletin 7 Minimum Standard 3.02 pipe miircrt 112" zinc plated hook attacbed with s /a' laxter L/0- din, haka 1% ur r *. \r\,-�* Isometric 1/e MWE plate .w. .r 1,a1•ted to &W-1 • XDP1 structural plastla with ) ith 2 -1 /8" hales and Ile ptaie I t"1 Manufect =ell by, plague i� Saluiiom Ina_ or egnaI 1 DJWT 0000 .` '' ';, shown with agttcaal plate .:" f .l r 11rDAT sld, aaaa, �pc'an EA -1 Ed. thick] H2 DP1/E strurtural plastic ppwKh Section manutacturkid by tPlzo lol Solutions lnG or equal 6/5" dim halt' %, If f i r. �r. .s• �. } _.. e•ta, EW -1 P STIC 00 "how ROW SOLUTIONS P.O. Box 4386 BMP DEBRIS CAGE Mufesta VA =004 INC. U3- 722-4ela �nnr pla*C- 3Adi=,oamt Perforated c( FOUNDATION DRAIN c: \3_01 -1a 4" SOLID PVC CLEAN -OUT PIPE. CLEAN -OUTS TO BE PROVIDED AT THE END OF THE UNDERDRAIN PIPING AND ALONG THE UNDERDRAIN SYSTEM EVERY 50' O.C. FIGURE 3.01 - la Homogeneous Embankments w /Seepage Controls • ' omogeneous fill !�,\/•`f \�',`�``� 4, min I t. , ut off trench -4 below suitable I material I Soil or rock L -_ _ _ _ _ _ _ _ J TYPICAL HOMOGENEOUS EMBANKMENT filter slots drain Sand, gravel or rock drain outlet 'Rock toe Transition filter CHIMNEY DRAIN I �Sorrrce. ,SC:SEraizineerinz Fictd fcrnaaal 3.01-3 BLANKET DRAIN fill or gravel '��ock or gravel drain ova -�-` 4 ?eo3, ba., Transition filter TOE DRAIN PF .. E� Inflow Hydrographs 3 Inflow Hydrographs Hydrograph o SCS name: 2 -Yr 24 -Hour SCS storm event Area (acres) 6.67o CN 79.500 Type 2 rainfall, P (in) 3.700 time of conc. (hrs) 0.1800 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 13.092 peak time (hrs) 11.970 volume (cy) 1576.292 Hydrograph 1 SCS name: to -Yr 24 -Hour SCS storm event Area (acres) 6.670 CN 79.500 Type 2 rainfall, P (in) 5.600 time of conc. (hrs) o.1800 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 25.101 peak time (hrs) 11.970 volume (cY) 3022.221 Hydrograph 2 SCS name: loo -Yr 24 -Hour SCS storm event Area (acres) 6.670 CN 79.500 Type z rainfall, P (in) 9.100 time of conc. (hrs) 0.1800 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 49.121 peak time (hrs) 11.970 volume (cy) 5914.122 srrt1, `` i.1. ' _ _ `" - le .� ra• .r � �v y ,sr�4 f F '.f ie 1 ,A i1 )f I ,el,, 1 tiJ t r 0 r '� � �� r, -';4.'r _r.e � / �, , ? �� __,, .�.+` t: ar ki trrt Q .. ��` Fw"& 00ta� SUL C lrn Top,%+ .� _ ECup _D_ I IM �smalm - Maim ,) 1 ,. " ,. 7 . . . 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LLj N to n W Ol ,� 0� 0 a L a c 0 I- 0 ZI o6 O Z aUJ .a W cW Z -00 _Z 0 W i 0 0 Z 0- _J] �- •- o U 0 N o 5 - _ 3 V) c o U � U - C O L 3 n. I_N CO Q) Q- n a X a-+ 0 �"_ �, - En 0 '0_5 0 3 :D 0, Z .E- 2f -.4 'i o Z N �D_ Z .o ,J - U n Z -" J J _ o J U `o `o T t 0 0 CL C:� 0 n. L6 2 : -0 u) =1 c U O O U L , +� C Q) o 0 (f) O C:-0 E:t :3F 0 a- 0 0 _a 0 U -0 0 0 > 0 •to -02 ' U 0 c cn CQ) 0, n. o a) u) (n - N 0 � 3 T_ M M 0) ® N 01 4 It ' Z �^ V J W 0) <� - N CL Q N Q > n Q W 0 L11 -► QC �' Z ® J_ i t~ LL! LLj LLJ (f) LLI L9 F-- Q o z Q Ili Z _J Z< V) C 2 _ U � � LV LU Q Ul C,J) W � O ZW LU Lu �- W � v + IIIIIIIIIIIIIIIIIIIIIIIIIIIIIII C/) I W I III W Q 0 0 N w J :; b o , ~ W 0- ( JOB NO. 112072 SCALE 1 " =80' SHEET NO. 28 0 a L a c 0 I- 0 ZI o6 O Z aUJ .a W cW Z -00 _Z 0 W i 0 0 Z 0- _J] �- •- o U 0 N o 5 - _ 3 V) c o U � U - C O L 3 n. I_N CO Q) Q- n a X a-+ 0 �"_ �, - En 0 '0_5 0 3 :D 0, Z .E- 2f -.4 'i o Z N �D_ Z .o ,J - U n Z -" J J _ o J U `o `o T t 0 0 CL C:� 0 n. L6 2 : -0 u) =1 c U O O U L , +� C Q) o 0 (f) O C:-0 E:t :3F 0 a- 0 0 _a 0 U -0 0 0 > 0 •to -02 ' U 0 c cn CQ) 0, n. o a) u) (n - N 0 � 3 Source: Va. DSWC DISTURBED AREA. TO DIVERT STORM RUNOFF FROM UPSLOPE DRAINAGE AREAS AWAY FROM UNPROTECTED DISTURBED AREAS AND SLOPES TO A STABILIZED OUTLET. TO DIVERT WITHIN 30 DAYS OF FINAL SITE STABILIZATION, WHEN MEASURES ARE NO LONGER NEEDED, EROSION CONTROL NOTES LEGEND GENERAL NOTES 21. THIS PLAN SHALL BE VOID IF THE OWNER DOES NOT OBTAIN A PERMIT WITHIN 1 YEAR OF TEMPORARILY DIVERTED TO PROTECT DISTURBED AREAS AND SLOPES OR RETAIN SEDIMENT ON THE DATF OF APPROVAL. ( WATER PROTEC77ON ORDINANCE SECTION 17- 204G.) ES -1: UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION ROADS 1. THE OWNER /CLIENT OF THIS PROPERTY /S: AND SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND MAINTAINED ACCORDING TO MIN /MUM STANDARDS AND SPECIFICATIONS OF L_ - - _ i EXISTING CUL VERT LICK /OWNER CREEK, LLC 2421 / VY ROAD THE VIRG N/A EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA ADJACENT AREAS' A TEMPORARY PONDING AREA FORMED BY CONSTRUCTING AN EARTHEN EMBANKMENT WI7H A REGULATIONS VR 625 -02 -QO EROSION AND SEDIMENT CONTROL _ CUL VERT CHARLOTTESVILLE, VA 22902 REGULA TONS. DROP INLET & STRUCTURE NO. 2. THE DEVELOPER OF THIS PROPERTY IS: R/VERBEND DEVELOPMENT, INC. ES -2: THE PLAN APPROVING AUTHORITY MUST BE N077FIED ONE WEEK PRIOR TO THE PRE - CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE SEDIMENT TRAP WILL BE USED NO LONGER THAN 18 MON77-IS, AND IT MAY BE CONSTRUCTED 321 E MANN ST, SUITE 201 EITHER INDEPENDENTLY OR IN CONJUNCTION WITH A TEMPORARY DIVERSION DIKE. HAS CONVEX DOWN AND ACROSS -SLOPE SHAPE. THIS SOIL HAS NO 3.14 7EMPORARY SEDIMENT BASIN: COMMENCEMENT OF LAND DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO CURB CHARLOTTESVILLE, VA 22902 7HE FINAL INSPECTION. CURB & GUTTER ATTN. ALAN TAYLOR ES-J. ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR LONG ENOUGH FOR THE MAJORITY OF THE SEDIMENT TO SETTLE OUT APPLIES BELOW J. THESE PLANS HAVE BEEN PREPARED BY- TO OR AS THE FIRST S7EP IN CLEARING. PROPOSED PAVEMENT COLLINS ENGINEERING, INC ES-4. A COPY OF THE APPROVED EROS /ON AND SEDIMENT CONTROL PLAN SHALL TOPOGRAPHY FOR THE CONSTRUCTION OF A TEMPORARY IMPOUNDMENT. 200 GARRETT STREET, SUITE K E BE MAINTAINED ON THE SITE AT ALL TIMES. EC -3A DITCH CHARLOTTESVILLE, CHARLOTTESVILLE, 22902 ES-5.-PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS OTHER THAN STRUCTURALLY LINED APRONS OR OTHER ACCEPTABLE ENERGY DISSIPATING DEVICES PLACED TELEPHONE. 293 -3719 FACSIMILE. (434) 293 -2813 INDICATED ON THESE PLANS (INCLUDING BUT NOT LIMITED 110, OFF -SITE I 3.02 CONSTRUCTION ENTRANCE - ONE CONSTRUCTION EN7RANCE SHALL BE DEPTH OF EC -3A DITCH 4. SOURCE OF TOPO &SURVEY.• TOPOGRAPHY COMP /LED FROM SURVEY BY A BORROW OR WASTE AREAS), THE CONTRACTOR SHALL SUBMIT A AUGUST 16 THROUGH OCTOBER ANNUAL RYE 6» AND EGRESS TO THE SITE CARE WILL BE TAKEN TO PROTECT ADJACENT COMBINATION OF ROUDABUSH, GALE AND ASSOCIATES AND LOU/SA AERIAL SURVEYS SUPPLEMENTARY EROS /ON CONTROL PLAN TO THE OWNER FOR REVIEW AND EC -2 DITCH INC., JANUARY 2007. BOUNDARY INFORMATION /S COMPILED FROM BOUNDARY DATA APPROVAL BY THE PLAN APPROVING AUTHORITY. CONSTRUCTION STAGING AREA. PROVIDED BY ROUDABUSH, GALE, AND ASSOC /AYES, DATED APRIL 2013. ES -6: THE CONTRACTOR /S RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL TRACK ING ONTO THE PAVED SURFACE. WHERE SEDIMENT IS TRANSPORTED ONTO A PUBLIC ROAD 5. ZONING. R -1 RESIDENTIAL, CLUSTER DEVELOPMENT AND BONUS DENSITY STANDARDS PREVENT EROSION CONTROL MEASURES NECESSARY TO PREVENT EROSION AND A RE 6" DEPTH OF EC -2 DITCH ARE BEING IMPLEMENTED. SEDIMENTATION AS DETERMINED 8Y THE PLAN APPROVING AUTHOR /TY. EARTH DITCH AX MA 6. TAX MAP AND PARCEL NUMBER: 05600- 00- 00- 095A0, 05600- 00 -00- 09580, ES- 7.•ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL ,,,__, -0 00-00 -05300 MEASURES AT ALL TIMES DURING LAND DISTURBING ACTIVITIES AND DURING DRIVEWAY CULVERT 7. USGS DATUM: 83 8. LOCA770N /ADDRESS OF PROJECT- EAST OF WESTHALL DEVELOPMENT SITE DEVELOPMENT UNTIL FINAL STABILIZATION /S ACHIEVED. PERIMETER OF SITE DISTURBANCE WHERE SHOWN ON THE PLANS TO DIRECT ANY PORTION OF THE CONSTRUCTION ENTRANCE WHICH IS UNPAVED. PARKING AND CONSTRUCTION R WILL ES -8: DURING DEWATER/NG OPERATIONS, WATER WILL BE PUMPED INTO AN , BENCH MARK 9. TOTAL ACREAGE OF SITE. 24.53 ACRES APPROVED WATER FILTERING DEVICE. 4' 10. SITE PHASING. MINIMUM FOUR PHASES ES -9: THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES UPHILL FROM SEDIMENT TRAP #3 11. PUBLIC UTILITIES. CONNECT TO EXISTING PUBLIC SEWER AND WATER PERIODICALLY AND AFTER EACH RUNOFF - PRODUCING RAINFALL EVENT. CLEARING LIMITS SHEETS THIS INCLUDES 3 SEDIMENT BASINS AND 5 SEDIMENT TRAPS. SILT FENCE, CULVERT INLET ANY NECESSARY REPAIRS OR CLEANUP TO MAINTAIN THE EFFECTIVENESS PROTECTION, AND DIVERSION DIKES SHALL ALSO BE INSTALLED AT THIS 77ME, STABILIZATION MEASURES * COLLINS ENGINEERING SHALL NOT HAVE AUTHORITY OVER CONTRACTOR'S WORK, OF THE EROS /ON CONTROL DEVICES SHALL BE MADE IMMED /ATELY. T VDOT STANDARD STOP SIGN SAFETY PRECAUTIONS, SCHEDULES, OR COMPLIANCE WITH LAWS AND REGULATIONS. 3.19 RIPRAP- RIPRAP SHALL BE INSTALLED AS OUTLET PROTECTION WHERE ANY LAND DISTURBANCE ACTIVITY AND SHALL BE MADE FUNCTIONAL BEFORE UPSLOPE LAND DISTURBANCE WE SHALL NOT ASSUME RESPONSIBILITY FOR ANY CONSTRUCTION STARTED PRIOR TO EROSION CONTROL NOTES - - - -200- - - - EXISTING CONTOUR PLAN APPROVAL. SHOWN ON THE PLANS. PERMANENTLY STABILIZE DISTURBED AREAS IN A MANNER T VAT IS ECONOMICAL, ADAPTABLE TO 3.32 PERMANENT SEEDING- PERMANEN7L Y SEEDING SHALL BE APPLIED WHERE 1. THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PR /OR TO THE 200 PROPOSED CONTOUR CONTROL PLAN AND THE INSPECTOR HAS APPROVED THE EROSION CONTROL MEASURES, THE CONTRACTOR PRE- CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT OF LAND CAN INSTALL THE TWO PERMANENT DIVERSION DITCHES AND BEGIN GRADING OPERATIONS 3.35 MULCHING - MULCHING SHALL BE APPLIED TO ANY SEEDED AREA AS DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL INSPECTION. 240.55 PROPOSED SPOT ELEVATION 9. INSTALL THE TEMPORARY PIPE FROM STR F58 TO SEDIMENT TRAP #3 2. ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CONSTRUCTED AND MAINTAINED IBC DENOTES TOP /BACK OF CURB WHEREVER SHOWN ON THE PLANS OR WHERE SLOPES EXCEED J. 1 SLOPE. ACCORDING TO MIN /MUM STANDARDS AND SPECIFICATIONS OF THE WRG /N /A EROS /ON AND w____ T/B DENOTES TOP OF BOX EROSION &SEDIMENT CONTROL SEDIMENT CONTROL HANDBOOK AND VIRGINIA REGULATIONS VT 625 -02 -00 EROSION AND SEDIMENT CONTROL REGULATIONS. DAYS AFTER FINAL GRADE IS REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL STABILIZATION SHALL BE INSTALLED WHERE SHOWN ON THE PLANS NO TREES SHALL BE J. ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR TO OR AS COL EROSION CONTROL H MEASURES . THE SOF STEP NDBOOK SPECIFICA77ON NUMBER WHERE SHOWN ON THE PLANS 4. A COPY THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE * STRUCTURAL EROSION AND SEDIMENT CONTROL PRACTICES SHALL BE IN ACCORDANCE MAINTAINED ON THE SITE AT ALL 77MES DISTURBANCE ACTIVITY AND SHALL BE MADE FUNCTIONAL BEFORE UPSLOPE LAND DISTURBANCE TAKES WITH THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK. STRUCTURAL 5. PRIOR TO COMMENCING LAND DISTURBING AC77VI77ES IN AREAS OTHER THAN INDICATED 9 STRAW BAIL BARRIER 3.04 9 PRACTICES USED IN THIS SECTION CONS /ST OF THE FOLLOWING: ON THESE PLANS (INCLUDING, BUT NOT LIMITED TO, OFF -SITE BORROW OR WASTE #7 UPON INSPECTOR APPROVAL TO ALLOW THE SANITARY SEWER AND CUL -DE -SAC TO BE INSTALLED. STORMWATER QUALITY WITH THE L/CK/NGHOLE REGIONAL STORMWATER AREAS), THE CONTRACTOR SHALL SUBMIT A SUPPLEMENTARY EROSION CONTROL PLAN TO Oh. DD TEMPORARY DIVERSION DIKE 3.09 3.01 SAFETY FENCE, THE OWNER FOR REVIEW AND APPROVAL BY 7HE PLAN APPROVING AUTHORITY. PERFORMS ITS FUNCTION, THE STONE MUST BE PULLED AWAY AND CLEANED AND /OR REPLACED. INSTALL A PR07ECTIVE BARRIER INSTALLED TO PREVENT ACCESS TO AN EROSION CON7ROL MEASURE. 6. THE CONTRACTOR IS RESPONSIBLE FOR INSTALLA7ON OF ANY ADD177ONAL EROS /ON ST mow# TEMPORARY SEDIMENT TRAP 3.13 TO PROHIBIT THE UNDESIRABLE USE OF AN EROSION CON7ROL MEASURE BY THE PUBLIC. APPLICABLE TO ANY CONTROL MEASURE OR SERIES OF MEASURES WHICH CAN BE CONSIDERED CONTROL MEASURES NECESSARY TO PREVENT EROSION AND SEDIMENTATION AS DETERMINED BY 7HE PLAN APPROVING AUTHORITY. THE EXISTING POND FOREBAY AND REMOVE THE TEMPORARY PIPE TO SEDIMENT BASIN 3. UNSAFE BY VIRTUE OF POTENTIAL ACCESS BY THE PUBLIC. 7. ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL MEASURES AT SB ® SEDIMENT BASIN 3.14 AND REMOVE THE TEMPORARY PIPE TO SEDIMENT TRAP J. ALL 77MES DURING LAND DISTURBING ACT7V777ES AND DURING SITE DEVELOPMENT UN77L 17. ONCE PHASE ll OF CONSTRUC7ION IS COMPLETE, 7HE SITE IS STABILIZED AND THE INSPECTOR HAS GIVEN 302 CONSTRUCTION ENTRANCE: FINAL STA61LIZAT70N IS ACHIEVED. A STABILIZED PAVED CONS7RUC77ON EN7RANCE WITH A WASH RACK LOCATED AT POINTS OF 8. DURING DEWATER/NG OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED FILTERING e INLET PROTECTION 3.07 VEHICULAR INGRESS AND EGRESS ON A CONSTRUCTION SITE TO REDUCE THE AMOUNT OF DEVICE. IN GENERAL, DURING CONSTRUCTION 77-1E RLD OR CONTRACTOR ON -SITE WILL CHECK MUD TRANSPORTED ONTO PAVED PUBLIC ROADS BY MOTOR VEHICLES OR RUNOFF. 9. THE CON7RACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES PERIODICALLY AND 19. ALL TEMPORARY EROS /ON AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WITHIN 30 DAYS AFTER CONSTRUCTION ENTRANCES SHALL BE INSTALLED AS SHOWN ON THE PLANS TO REDUCE THE AF7ER EACH RUNOFF PRODUCING RAINFALL EVENT. ANY NECESSARY REPAIRS OR SF S!L T FENCE J. 05 AMOUNT SEDIMENT TRANSPOR7ED ONTO PUBLIC ROADWAYS. CLEANUP TO MAINTAIN THE EFFEC7VENESS OF THE EROSION CONTROL DEVICES SHALL BE SOIL AREAS RESULTING FROM THE DISPOSITION OF TEMPORARY MEASURES SHALL BE PERMANENTLY ACCORDANCE WITH THE VIRG /NIA EROS /ON & SEDIMENT CONTROL HANDBOOK. MADE IMMED /A TEL Y. CE O c� CONSTRUCT /ON ENTRANCE 3.02 3.03 CONSTRUCTION ROAD STABILIZATION, THE TEMPORARY STABILIZA7ON OF ACCESS ROADS, SUBDIVISION ROADS, PARKING AREAS, AND 10. ALL FILL MATERIAL TO BE TAKEN FROM AN APPROVED, DESIGNATED BORROW AREA. 11. ALL WASTE MATERIALS SHALL BE TAKEN TO AN APPROVED WASTE AREA. EARTH FILL OTHER SITE VEHICLE TRANSPORTATION ROUTES WITH STONE IMMEDIATELY AF7ER GRADING. TO SHALL BE INERT MATERIALS ONLY, FREE OF ROOTS, STUMPS, WOOD, RUBBISH, AND OTHER CD , CHECK DAM 3.20 REDUCE EROSION OF TEMPORARY ROADBEDS BY CONSTRUCTION TRAFFIC DURING WET WEATHER AND TO REDUCE EROSION AND SUBSEQUENT REGARDING OF PERMANENT ROADBEDS BETWEEN DEBRIS. 12. BORROW OR WASTE AREAS ARE TO BE RECLAIMED WITHIN 7 DAYS OF COMPLETION PER THE TIME OF INITIAL GRADING AND FINAL STABIL/ZA T/ON. USE WHEREVER STONE -BASE ROADS ZONING ORDINANCE SECT /ON 5.1.28. OR PARKING AREAS ARE CONSTRUCTED, WHETHER PERMANENT OR TEMPORARY, FOR USE BY 13. ALL INERT MATERIALS SHALL BE TRANSPORTED IN COMPLIANCE WITH SECTION 13 -301 OF S = TEMPORARY FILL DIVERSION 3.10 CONSTRUCTION TRAFFIC. THE CODE OF ALBEMARLE. 14. BORROW, FILL OR WASTE AC77VTTY INVOLVING INDUSTRIAL -TYPE POWER EQUIPMENT SHALL 3.05 SILT FENCE: BE LIMITED TO THE HOURS OF 7.•OOAM TO 9.0OPM. A TEMPORARY SEDIMENT BARRIER CONS /STING OF A SYNTHETIC FILTER FABRIC STRETCHED 15. BORROW, FILL OR WASTE AC77WTY SHALL BE CONDUCTED IN A SAFE MANNER THAN S DIVERSION 312 ACROSS AND ATTACHED TO SUPPORTING POSTS AND EN7RENCHED, TO INTERCEPT AND DETAIN MAINTAINS LATERAL SUPPORT, OR ORDER TO MINIMIZE ANY HAZARD TO PERSONS, SMALL AMOUNTS OF SEDIMENT FROM DISTURBED AREAS DURING CONSTRUCTION OPERATIONS IN PHYSICAL DAMAGE TO ADJACENT LAND AND /MPROVEMEN75, AND DAMAGE TO ANY PS PS PERMANENT SEEDING 3.32 Q ORDER TO PREVENT SEDIMENT FROM LEAVING THE SITE, AND TO DECREASE THE VELOCITY OF PUBLIC STREET BECAUSE 0 SL /DES, SINKING, OR COLLAPSE. 16. THE DEVELOPER SHALL RESERVE 7HE RIGHT TO INSTALL, MAINTAIN, REMOVE OR CONVERT SHEET FLOWS AND LOW -TO- MODERATE LEVEL CHANNEL FLOWS. THE SILT FENCE BARRIERS 'GRADES TO PERMANENT STORMW47ER MANAGEMENT FACILITIES WHERE APPLICABLE ALL EROSION SHALL BE INSTALLED DOWN SLOPE OF AREAS WITH MINIMAL TO FILTER SEDIMENT L CON7ROL MEASURES REQUIRED BY THIS PLAN REGARDLESS OF THE SALE OF ANY LOT, LADEN RUNOFF FROM SHEET FLOW AS /ND(CA TED. THEY SHALL BE INSPECTED IMMED /A 7FL Y UNIT, BUILDING OR OTHER PORTION OF THE PROPERTY. TO TO TOPSOIL /NG 3.30 AFTER EACH RAINFALL AND MAINTAINED IN ACCORDANCE WITH THE VIRGINIA EROSION & 17 TEMPORARY STABILIZATON SHALL BE TEMPORARY SEEDING AND MULCHING. SEEDING IS TO SEDIMENT CONTROL HANDBOOK (VESCH). BE AT 75 LBS /ACRE, AND IN THE MONTHS OF SEPTEMBER TO FEBRUARY TO CONS /ST A C/P O CULVERT INLET PROTECT 3 ON O8 3.07 STORM DRAIN INLET PROTECT /ON• 50150 MIX OF ANNUAL RYEGRASS AND CEREAL WINTER RYE, OR IN MARCH AND APRIL TO CONS /ST OF ANNUAL RYE, OR MAY THROUGH AUGUST TO CONSIST OF GERMAN MILLET. A SEDIMENT FILTER OR AN EXCAVATED IMPOUNDING AREA AROUND A STORM DRAIN DROP INLET OR CURB INLET. TO PREVENT SEDIMENT FROM ENTERING STORM DRAINAGE SYSTEMS STRAW MULCH /S TO BE APPLIED AT BOLBS /t00SF. ALTERNATIVES ARE SUBJECT TO PRIOR TO PERMANENT STABILIZATION OF THE DISTURBED AREA. INLET PROTECT70N APPLIES APPROVED BY THE COUNTY EROSION CONTROL INSPECTOR. DC DC DUST CONTROL 3.39 WHERE STORM DRAIN INLETS ARE TO BE MADE OPERATIONAL BEFORE PERMANENT 18. PERMANENT STABILIZATION SHALL BE LIME AND FER77L/ZER, PERMANENT SEEDING, AND STABILIZATION OF THE CORRESPONDING DISTURBED DRAINAGE AREA. MULCH. AGRICULTURAL GRADE LIMESTONE SHALL BE APPLIED AT 90LBS /1000SF, INCORPORATED INTO THE TOP 4 -6 INCHES OF SOIL. FER77LIZER SHALL BE APPLIED AT TSD ___ _7 TEMPORARY SLOPE DRAIN 3.15 3.08 CULVERT INLET PROTECT /ON. 1000LBS /ACRE AND CONSIST OF A 10 -20 -10 NU7R /ENT MIX. PERMANENT SEEDING SHALL A SEDIMENT FILTER LOCATED AT THE INLET TO STORM SEWER CULVERTS. TO PREVENT BE APPLIED AT 180LBS /ACRE AND CONSIST OF 957. KENTUCKY 31 OR TALL FESCUE AND SEDIMENT FROM ENTERING, ACCUMULA77NG IN AND BEING TRANSFERRED BY A CULVERT AND 0 -57 PERENNIAL RYEGRASS OR KENTUCKY BLUEGRASS STRAW MULCH IS TO BE APPLIED SA SAFETY FENCE 3 01 ASSOCIATED DRAINAGE SYSTEM PRIOR TO PERMANENT STAB /L /ZA77ON OF A DISTURBED AT 80LBS1100SF. ALTERNATIVES ARE SUBJECT TO APPROVED BY THE COUNTY EROSION PROJECT AREA. TO PROVIDE EROSION CONTROL AT CULVERT INLETS DURING THE PHASE OF A CONTROL INSPECTOR. PROJECT WHERE ELEVATION AND DRAINAGE PAT7ERNS CHANGE, CAUSING ORIGINAL CONTROL 19. MAINTENANCE. ALL MEASURES ARE TO BE INSPECTED WEEKLY AND AFTER EACH MEASURES TO BE INEFFECTIVE OR IN NEED OR REMOVAL. WHERE CULVERT AND ASSOCIATED RAINFALL. ANY DAMAGE OR CLOGGING TO STRUCTURAL MEASURES IS TO BE REPAIR & , TEMPORARY RIGHT -OF -WAY 3.11 DRAINAGE SYSTEM IS TO BE MADE OPERATIONAL PRIOR TO PERMANENT STABILIZATION OF 7HE IMMEDIATELY. SILT TRAPS ARE TO BE CLEANED WHEN 507 OF 7HE WET STORAGE VOLUME DIVERSION DISTURBED AREA. IS FILLED WITH SEDIMENT. ALL SEEDED AREAS ARE TO BE RESEEDED WHEN NECESSARY TO ACHIEVE A GOOD STAND OF GRASS. SILT FENCE AND DIVERSION DYKES WHICH ARE 3.09 TEMPORARY DIVERS /ON D/KE.• COLLECTING SEDIMENT TO HALF THEIR HEIGHT MUST BE CLEANED AND REPAIRED A 7EMPORARY RIDGE OF COMPACTED SOIL CONSTRUCTED AT THE TOP OR BASE OF A SLOPING IMMEDIATELY. 20 ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE REMOVED Source: Va. DSWC DISTURBED AREA. TO DIVERT STORM RUNOFF FROM UPSLOPE DRAINAGE AREAS AWAY FROM UNPROTECTED DISTURBED AREAS AND SLOPES TO A STABILIZED OUTLET. TO DIVERT WITHIN 30 DAYS OF FINAL SITE STABILIZATION, WHEN MEASURES ARE NO LONGER NEEDED, SEDIMENT -LADEN RUNOFF FROM A DISTURBED AREA TO A SEDIMENT - TRAPPING FACILITY SUCH SUBJECT TO APPROVAL BY 7HE COUNTY EROSION CON7ROL INSPECTOR. AS A SEDIMENT TRAP OR SEDIMENT BASIN. USE WHEREVER STORMWATER RUNOFF MUST BE 21. THIS PLAN SHALL BE VOID IF THE OWNER DOES NOT OBTAIN A PERMIT WITHIN 1 YEAR OF TEMPORARILY DIVERTED TO PROTECT DISTURBED AREAS AND SLOPES OR RETAIN SEDIMENT ON THE DATF OF APPROVAL. ( WATER PROTEC77ON ORDINANCE SECTION 17- 204G.) SITE DURING CONSTRUC770N. THESE STRUCTURES GENERALLY HAVE A LIFE EXPECTANCY OF 18 22. PERMANENT VEGETATION SHALL BE INSTALLED ON ALL DENUDED AREAS WITHIN NINE (9) MONTHS OR LESS, WHICH CAN BE PROLONGED WITH PROPER MAINTENANCEE, MONTHS AF7ER THE DATE THE LAND DISTURBING AC771WTY COMMENCED. (WATER INLET PROTECTION, AND SILT FENCE WILL BE INSTALLED TO CONTROL SURFACE PROTECTION ORDINANCE SEC77ON 17 -2078) 3.13 TEMPORARY SEDIMENT TRAP, ADJACENT AREAS' A TEMPORARY PONDING AREA FORMED BY CONSTRUCTING AN EARTHEN EMBANKMENT WI7H A SOIL DESCRIPTION STONE OUTLET. TO DETAIN SEDIMENT -LADEN RUNOFF FROM SMALL DISTURBED AREAS LONG CONNECTOR ROAD CORRIDOR. IT IS BORDERED BY FOOTHILLS CROSSING TO THE NORTH, WESTHALL TO THE ENOUGH TO ALLOW THE MAJORITY OF THE SEDIMENT TO SETTLE OUT USE BELOW DISTURBED 81B - THURMONT LOAM, 27 TO 79 SLOPES SOIL IS WELL DRAINED, WITH MORE AREAS WHERE THE TOTAL CON7R/BUT/NG DRAINAGE AREA IS LESS THAN 3 ACRES, WHERE THE THAN 80 /N. DEPTH TO THE W47ER TABLE. MADE FROM COLLUVIUM SEDIMENT TRAP WILL BE USED NO LONGER THAN 18 MON77-IS, AND IT MAY BE CONSTRUCTED DERIVED FROM GRANITE, GRANODIORITE, AND GRANITE GNEISS, THIS SOIL EITHER INDEPENDENTLY OR IN CONJUNCTION WITH A TEMPORARY DIVERSION DIKE. HAS CONVEX DOWN AND ACROSS -SLOPE SHAPE. THIS SOIL HAS NO 3.14 7EMPORARY SEDIMENT BASIN: FREQUENCY OF POND /NG OR FLOODING AND A MODERATELY HIGH TO HIGH A TEMPORARY BARRIER OR DAM WITH A CONTROLLED STORMWATER RELEASE STRUCTURE KSAT WITH MODERATE WATER CAPACITY. FORMED BY CONSTRUC77NG AN EMBANKMENT OF COMPACTED SOIL ACROSS A DRAINAGEWAY. 7B - BRADDOCK CLAY LOAM -27 TO 77 SLOPES SOIL IS WELL DRAINED, WITH TO DETAIL SEDIMENT-LADEN RUNOFF FROM DISTURBED AREAS IN "WET" AND `DRY" STORAGE MORE THAN 80 INCHES TO THE WATER TABLE. MADE FROM ALLUVIUM LONG ENOUGH FOR THE MAJORITY OF THE SEDIMENT TO SETTLE OUT APPLIES BELOW AND COLLUVIUM DERIVED FROM ACID CRYSTALLINE ROCKS, THIS SOIL HAS DISTURBED AREAS WHERE 77-IE TOTAL CONTR /BURNG DRAINAGE AREA IS EQUAL TO OR CONVEX DOWN -SLOPE AND LINEAR ACROSS -SLOPE SHAPE. NO GREATER THAN THREE ACRES. THERE MUST BE SUFFICIENT SPACE AND APPROPR /A 7F FREQUENCY OF POND/NG OR FLOODING, HIGH WATER CAPACITY, AND TOPOGRAPHY FOR THE CONSTRUCTION OF A TEMPORARY IMPOUNDMENT. MODERATELY HIGH TO HIGH KSA T. 3.18 OUTLET PROTECTION, • 37C3 - HAYESVILLE CLAY LOAM -77 TO 157. SLOPES SOIL /S WELL DRAINED, J. CONTRACTOR SHALL INSTALL TREE PROTEC7ON FENCING BEFORE ANY SITE DISTURBANCE SHALL TAKE STRUCTURALLY LINED APRONS OR OTHER ACCEPTABLE ENERGY DISSIPATING DEVICES PLACED WITH MORE THAN 80 INCHES TO THE WATER TABLE MADE FROM PROPOSED SEDIMENT BASINS AND SEDIMENT TRAPS. DESCRIPTION OF EROSION & SEDIMENT EROSION CONTROL NOTES & NARRATIVE CONTROL MEASURES: PURPOSE. b.ALL INLET PROTECTION AND GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP THAT WILL PREVENT PROPER DRAINAGE. IF THE GRAVEL IS CLOGGED BY SEDIMENT, THE GRAVEL WILL BE REMOVED AND CLEANED, OR IT W/LL BE REPLACED. c. ALL S/L T FENCE BARRIERS WILL BE CHECKED REGULARL Y FOR UNDERMINING OR DETERIORATION OF THE FABRIC AND REPAIRED AS REQUIRED. SEDIMENT SHALL BE REMOVED WHEN THE LEVEL OF SEDIMENT DEPOSITION REACHED HALF WAY TO THE TOP OF THE BARRIER. d. ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO SEE THAT A GOOD STAND IS MAINTAINED. AREAS SHOULD BE FERTILIZED AND RESEEDED AS NEEDED. IN CASE OF EMERGENCY, THE PRIMARY CONTACT FOR THE PROJECT WILL BE THE RLD OR CONTRACTOR ON -SITE. THE CONTRACTOR WILL BE DETERMINED AT THE TIME THE CONTRACT IS AWARDED. IN ADDITION THE OWNER MAY BE CONTACTED, MR. ALAN TAYLOR. UPON COMPLETION OF THE PROJECT, THE OWNER WILL BE RESPONSIBLE FOR SITE MAINTENANCE. THE PURPOSE OF THIS LAND - DISTURBING ACTIVITY IS TO CREATE PHASE 1 OF THE WESTLAKE HILLS EROSION AND SEDIMENT CONTROL MEASURES.• SUBD /V /S /ON. THE TOTAL ACREAGE TO BE DISTURBED WITH THIS PLAN IS 27.64 ACRES. IT IS ANTICIPATED THAT A CONSTRUCT /ON ENTRANCE, CONSTRUCTION ROAD EX /STING S /TE CONDITIONS' STABILIZATION, TEMPORARY DIVERSION DIKES, RIGHT OF WAY DIVERS /ON, THE EXISTING SITE IS A VACANT HILLY PARCEL. AN EXISTING POND & STREAM EX /STS IN THE CENTER OF THE P SITE IS GENERALLY WELL DRAINED WITH SOME CRITICAL SLOPES. EROSION AND SEDIMENT CONTROL MEASURES SEDIMENT TRAPS AND BAS /NS, OUTLET PROTECTION, INLET PROTECTION, CULVERT HAVE BEEN DESIGNED TO CONFORM TO THE EXISTING SITE SLOPE AND PROTECT THE STREAM AND ADJACENT INLET PROTECTION, AND SILT FENCE WILL BE INSTALLED TO CONTROL SURFACE PROPER7ES. DRAINAGE. TEMPORARY SEEDING WILL BE USED IMMEDIATELY FOLLOWING ALL ADJACENT AREAS' LAND DISTURBANCE ACTIVITIES. TEMPORARY STOCKPILE AREAS WILL BE THE SITE IS POSITIONED BETWEEN ROUTES 240 AND 250 AND IS ALONG THE MASTER PLANNED CROZET MAINTAINED FROM TOPSOIL THAT WILL BE STRIPPED FROM AREAS TO BE GRADED CONNECTOR ROAD CORRIDOR. IT IS BORDERED BY FOOTHILLS CROSSING TO THE NORTH, WESTHALL TO THE AND STORED FOR LATER SPREADING. STOCKPILE LOCATIONS SHALL BE ON SITE WEST, VACANT LAND TO THE SOUTH,, AND WESTERN RIDGE TO THE EAST. AND SHALL BE STABILIZED WITH A TEMPORARY VEGETATIVE COVER. PERMANENT OFFS17E LAND DISTURBANCE.' SEEDING WILL BE PERFORMED FOR ALL AREAS WHICH WILL NO LONGER BE WATERLINE CONNECTING TO WESTHALL DRIVE. WITH MORE THAN 80 INCHES TO THE WATER TABLE. MADE FROM CR/ T/CAL AREAS' EXCA VA TED AND WHERE CONSTRUCT /ON ACTIVITIES HAVE CEASED. PERMANENT CRITICAL SLOPES ON -SITE WILL BE PROTECTED. CARE WILL BE TAKEN TO PREVENT THE EROSION AND H BE SEEDING SHALL ALSO B PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE SEDIMENTATION OF THE EXISTING GRADE AND TO PROTECT THE EX /STING STREAM ON -SITE AND NEIGHBORING LEFT DORMANT FOR A YEAR OR MORE. SELECTION OF SEED MIXTURE WILL PROPERTIES. DEPEND ON THE TIME OF YEAR APPLIED. TEMPORARY SEEDING WILL BE SOILS, PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT FOR MORE SEE SOILS BOUNDARIES ON SHEET 22 AND DESCRIPTIONS ON THIS SHEET THAN SEVEN DAYS. THESE AREAS SHALL BE SEEDED WITH FAST GERMINATING SEQUENCE OF CONSTRUCTION: VEGETATION IMMEDIATELY FOLLOWING GRADING OF THOSE AREAS SELECTION OF 1. NOTIFY ALBEMARLE COUNTY TO SCHEDULE A PRE- CONSTRUCTION MEETING AS REQUIRED. SEED MIXTURE WILL DEPEND ON THE TIME OF YEAR APPL /ED. 2. NO EROSION CONTROL MEASURES MAY BE REMOVED DURING THE CONSTRUCTION PROCESS WITHOUT THE APPROVAL FROM THE INSPECTOR ON THE PROJECT. J. CONTRACTOR SHALL INSTALL TREE PROTEC7ON FENCING BEFORE ANY SITE DISTURBANCE SHALL TAKE 3.01 SAFETY FENCE - SAFETY FENCE WILL BE INSTALLED AROUND ALL PLACE. CONTRACTOR SHALL USE TREE PROTECTION FENCING TO STAKE OUT THE LIMITS OF CLEARING AND PROPOSED SEDIMENT BASINS AND SEDIMENT TRAPS. CONTRACTOR SHALL ENSURE THAT R DISTURBANCE ON-SITE. E E TEES TO BE SA VED ARE FLAGGED ALONG THE 3.02 CONSTRUCTION ENTRANCE - ONE CONSTRUCTION EN7RANCE SHALL BE LIMITS OF CLEARING TO ENSURE THE PROPOSED TREE PRESERVATION ACREAGE IS MET. DISTURBANCE INSTALLED A T WESTHALL DRIVE. THIS WILL BE THE ONLY PO /NT OF INGRESS OUTS /DE OF THE LIMITS OF CLEARING IS SOLELY PERMITTED FOR THE INSTALLATION OF THE GREENWAY, AUGUST 16 THROUGH OCTOBER ANNUAL RYE AND MITIGATION PLANTINGS. THE PROPOSED GREENWAY AND MITIGA77ON PLANTINGS SHALL BE INSTALLED AND EGRESS TO THE SITE CARE WILL BE TAKEN TO PROTECT ADJACENT WITHOUT ANY CLEARING OF EXISTING TREES ROADWAYS FROM TRANSFER OF SEDIMENT. 4. INSTALL THE PAVED CONSTRUCTION ENTRANCE WITH WASH RACK AS SHOWN ON THE PLANS. 3.03 CONSTRUCTION ROAD STABILIZATION - CRS WILL BE INSTALLED ALONG THE CONSTRUCTION ENTRANCE TO SE INSTALLED WHERE CONSTRUCTION VEHICLE ROUTES INTERSECT PAVED CONSTRUCTION STAGING AREA. PUBLIC ROADS, PROVISIONS SHALL BE MADE TO MINIMIZE THE TRANSPORT OF SEDIMENT BY (VEHICULAR) 3.05 SILT FENCE- SILT FENCE WILL BE PLACED ON THE DOWNSTREAM SIDE OF TRACK ING ONTO THE PAVED SURFACE. WHERE SEDIMENT IS TRANSPORTED ONTO A PUBLIC ROAD DISTURBANCE WHERE NOTED ON THE PLANS. SURFACE, THE ROAD SHALL BE CLEANED THOROUGHLY AT THE END OF EACH DAY SEDIMENT SHALL BE HIGH TO HIGH KSA T. REMOVED FROM THE ROADS BY SHOVELING OR SWEEPING AND TRANSPORTING TO A SEDIMENT CONTROL 3.07 STORM DRAIN INLET PROTECTION- IP WILL BE INSTALLED ON EACH DISPOSAL AREA. STREET WASHING SHALL BE ALLOWED ONLY AFTER SEDIMENT IS REMOVED IN THIS PROPOSED INLET AS SHOWN ON THE PLANS. MANNER. INSTALL THE WASH RACK UPHILL FROM PROPOSED SEDIMENT TRAP #1. ACSA WILL DETERMINE 3.08 CULVERT INLET PROTECT /ON - C/P SHALL BE APPLIED TO THE INLET OF THE APPROPRIATE METHOD OF SUPPLYING THE WASH RACK. INSTALL THE ACCESS FROM WESTHALL DRIVE THE PROPOSED CULVERT CONNECTOR ROAD STA 13 +80. AND STAGING AREA WITH CONSTRUCTION A TA AND THE PARKING A C RODS STABILIZATION. CONSTRUCTION ROAD 3.09 TEMPORARY DIVERSION DIKE- DIVERSION DIKES WILL BE USED AROUND THE STABILIZATION SHALL CONSIST OF 4" OF 21A GRAVEL IN THE PARKING AREA, AND 8" OF 21A GRAVEL IN PERIMETER OF SITE DISTURBANCE WHERE SHOWN ON THE PLANS TO DIRECT ANY PORTION OF THE CONSTRUCTION ENTRANCE WHICH IS UNPAVED. PARKING AND CONSTRUCTION RUNOFF TO ON -SITE SEDIMENT CONTROL FACILITIES. ENTRANCE AREAS SHALL BE CLEARED OF ALL VEGETATION, ROOTS, OR OTHER OBJECTIONABLE MATERIALS FROM RESIDUUM WEATHERED FROM GRANITE AND GNEISS, THIS SOIL HAS BEFORE CONSTRUCTION ROAD STABILIZATION IS INSTALLED. A 2ND CONSTRUCTION ENTRANCE SHALL BE 3.13 TEMPORARY SEDIMENT TRAP- TEMPORARY SEDIMENT TRAPS WILL BE INSTALLED AT DONNA STREET FOLLOWING THE SAME GUIDELINES AS ABOVE. INSTALL THE WASHRACK INSTALLED WHERE SHOWN ON THE PLANS. UPHILL FROM SEDIMENT TRAP #3 3.14 7EMPORARY SEDIMENT BASIN- TEMPORARY SEDIMENT BASINS WILL BE 5. INSTALL THE INITIAL CONSTRUCTION MEASURES AS SHOWN ON THE PHASE l EROSION CONTROL PLAN INSTALLED WHERE SHOWN ON THE PLANS. SHEETS THIS INCLUDES 3 SEDIMENT BASINS AND 5 SEDIMENT TRAPS. SILT FENCE, CULVERT INLET O 3.18 OUTLET PROTECTION- ,TO BE PROVIDED AT THE OUTFACE OF DRAINAGE PROTECTION, AND DIVERSION DIKES SHALL ALSO BE INSTALLED AT THIS 77ME, STABILIZATION MEASURES WA TER CAPAC /TY, AND MODERA TEL Y HIGH TO HIGH KSA T. SHALL BE APPLIED TO EARTHEN STRUCTURES SUCH AS DAMS, DIKES, AND DIVERSIONS IMMED /A TEL Y AFTER PIPES WHERE SHOWN PLANS. INSTALLATION. MEASURES INTENDED TO TRAP SEDIMENT SHALL BE CONSTRUCTED AS A FIRST STEP WITH 3.19 RIPRAP- RIPRAP SHALL BE INSTALLED AS OUTLET PROTECTION WHERE ANY LAND DISTURBANCE ACTIVITY AND SHALL BE MADE FUNCTIONAL BEFORE UPSLOPE LAND DISTURBANCE SHOWN ON THE PLANS. TAKES PLACE. 3.31 TEMPORARY SEEDING- TEMPORARY SEEDING SHALL BE APPLIED WHERE 6. INSTALL ANY REMAINING EROSION CONTROL ITEMS AS SHOWN ON THE PHASE l EROSION CONTROL PLAN. SHOWN ON THE PLANS. PERMANENTLY STABILIZE DISTURBED AREAS IN A MANNER T VAT IS ECONOMICAL, ADAPTABLE TO 3.32 PERMANENT SEEDING- PERMANEN7L Y SEEDING SHALL BE APPLIED WHERE 7. ONCE ALL THE EROSION CONTROL ITEMS HA VE BEEN INSTALLED AS SHOWN ON THE PHASE / EROS /ON SEDIMENT CONTROL HANDBOOK, 3RD ED.) CONTROL PLAN AND THE INSPECTOR HAS APPROVED THE EROSION CONTROL MEASURES, THE CONTRACTOR SHOWN ON THE PLANS CAN INSTALL THE TWO PERMANENT DIVERSION DITCHES AND BEGIN GRADING OPERATIONS 3.35 MULCHING - MULCHING SHALL BE APPLIED TO ANY SEEDED AREA AS 8. INSTALL THE TEMPORARY PIPE FROM STR 38 TO SEDIMENT BASIN #3. DEEMED NECESSARY FOR STABILIZATION AND GROWTH. 9. INSTALL THE TEMPORARY PIPE FROM STR F58 TO SEDIMENT TRAP #3 3.36 SOIL STABILIZATION BLANKETS AND MATTING- BIM SHALL BE EMPLOYED 10. INSTALL SEDIMENT TRAP #6 WHEREVER SHOWN ON THE PLANS OR WHERE SLOPES EXCEED J. 1 SLOPE. 11. ROUGH GRADE THE SITE TO THE CONTOURS SHOWN ON THE EROSION CONTROL PLAN. 12• PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN SEVEN 3.38 TREE PRESERVATION AND PROTECTION- TREE PRESERVATION FENCING DAYS AFTER FINAL GRADE IS REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL STABILIZATION SHALL BE INSTALLED WHERE SHOWN ON THE PLANS NO TREES SHALL BE SHALL BE APPLIED WITHIN SEVEN DA YS TO DENUDED AREAS THA T MA Y NOT BE A T FINAL GRADE BUT WILL HARMED OUTSIDE OF THE LIMITS OF TREE PROTECTION FENCING. REMAIN DORMANT (UNDISTURBED) FOR LONGER THAN 30 DAYS. PERMANENT STABILIZATION SHALL BE 3.39 DUST CONTROL- DUST CONTROL SHALL BE APPLIED THROUGHOUT THE SITE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR MORE THAN ONE YEAR. WHERE SHOWN ON THE PLANS 13. INSTALL THE CONSTRUCTION MEASURES AS SHOWN ON THE PHASE ll EROSION CONTROL PLAN SHEETS 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 STORMIER MANAGEMENT PLACE. STORMWATER RUNOFF QUANTITY WILL BE TREATED ON -SITE THROUGH THE USE 14. INSTALL THE UTILITIES, CURB AND GUTTER, AND ROADS. CONVERT SEDIMENT BASIN #2 TO SEDIMENT TRAP OF A B /OF /L TER. THE ENT /RE PROJECT IS INCLUDED IN A PRO -RATA SHARE FOR #7 UPON INSPECTOR APPROVAL TO ALLOW THE SANITARY SEWER AND CUL -DE -SAC TO BE INSTALLED. STORMWATER QUALITY WITH THE L/CK/NGHOLE REGIONAL STORMWATER INLET PROTECTION SHALL BE INSPECTED AFTER EACH RAINFALL EVENT AND REPAIRS SHALL BE MADE AS MANAGEMENT FACILITY. SEE STORMWATER MANAGEMENT PLAN SHEETS NEEDED. IF THE STONE FILTER BECOMES CLOGGED WITH SED IMENT SO THAT /T NO LONGER ADEQUATELY 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 ll EROSION CONTROL PLAN. 15. ONCE THE INSPECTOR GIVES APPROVAL THE CONTRACTOR SHALL INSTALL THE REMAINING STORM PIPING TO THE EXISTING POND FOREBAY AND REMOVE THE TEMPORARY PIPE TO SEDIMENT BASIN 3. 16. ONCE THE INSPECTOR GIVES APPROVAL THE CONTRACTOR SHALL INSTALL THE OUTFALL FROM STR F58 AND REMOVE THE TEMPORARY PIPE TO SEDIMENT TRAP J. 17. ONCE PHASE ll OF CONSTRUC7ION IS COMPLETE, 7HE 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. MAINTENANCE.' 18. MAINTAIN ALL EROS /ON CONTROL MEASURES AS SPECIFIED IN THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, REMOVING ONLY WHEN APPROVED BY THE LOCAL PROGRAM ADMINISTRATOR IN IN GENERAL, DURING CONSTRUCTION 77-1E RLD OR CONTRACTOR ON -SITE WILL CHECK ACCORDANCE WITH THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK. ALL EROSION AND SEDIMENT CONTROL MEASURES DAILY AND AFTER EACH 19. ALL TEMPORARY EROS /ON AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WITHIN 30 DAYS AFTER SIGNIFICANT RAINFALL. MONITORING REPORTS WILL BE REQUIRED FROM THE RLD IF FINAL SITE STABILIZATION OR AFTER THE TEMPORARY MEASURES ARE NO LONGER NEEDED, UNLESS NEEDED. SPECIFIC ATTENTION WILL BE GIVEN TO THE FOLLOWING ITEMS. OTHERWISE AUTHOR /ZED BY THE LOCAL PROGRAM ADMINISTRATOR. TRAPPED SEDIMENT AND THE DISTURBED a.SED/MENT BASINS AND /OR TRAPS WILL BE CLEANED AND MAINTAINED IN SOIL AREAS RESULTING FROM THE DISPOSITION OF TEMPORARY MEASURES SHALL BE PERMANENTLY ACCORDANCE WITH THE VIRG /NIA EROS /ON & SEDIMENT CONTROL HANDBOOK. STABILIZED TO PREVENT FURTHER EROS /ON AND SEDIMENTATION. b.ALL INLET PROTECTION AND GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP THAT WILL PREVENT PROPER DRAINAGE. IF THE GRAVEL IS CLOGGED BY SEDIMENT, THE GRAVEL WILL BE REMOVED AND CLEANED, OR IT W/LL BE REPLACED. c. ALL S/L T FENCE BARRIERS WILL BE CHECKED REGULARL Y FOR UNDERMINING OR DETERIORATION OF THE FABRIC AND REPAIRED AS REQUIRED. SEDIMENT SHALL BE REMOVED WHEN THE LEVEL OF SEDIMENT DEPOSITION REACHED HALF WAY TO THE TOP OF THE BARRIER. d. ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO SEE THAT A GOOD STAND IS MAINTAINED. AREAS SHOULD BE FERTILIZED AND RESEEDED AS NEEDED. IN CASE OF EMERGENCY, THE PRIMARY CONTACT FOR THE PROJECT WILL BE THE RLD OR CONTRACTOR ON -SITE. THE CONTRACTOR WILL BE DETERMINED AT THE TIME THE CONTRACT IS AWARDED. IN ADDITION THE OWNER MAY BE CONTACTED, MR. ALAN TAYLOR. UPON COMPLETION OF THE PROJECT, THE OWNER WILL BE RESPONSIBLE FOR SITE MAINTENANCE. :" AT LOW END OF DEVICE POINTED DOWNHILL To PREVENT KMDM TOTE&_ REMOVE SEDIMENT FIRM THE UPSLOPE SIDE OF THE 50)00' WHEN ACCUMULATION HAS REACHED 1/2 OF EFFECTIVE HEIGHT OF SOXX"` 2 SLOPES GREATER THAN 5% MAY RMUIREADDITIONA. STARILIZATION PRACTICES 3. SOXXTM MAY BE SEEDED AT THE TIME OF INSTALLATION IMPROVE WILDLIFE HABITAT. TO ENHANCE NATURAL BEAUTY. UPON COMPLETION OF DOWN -SLOPE AND CONVEX ACROSS -SLOPE SHAPE. NO FREQUENCY OF FlLTREXX� RUNOFF DIVERSION ACTIVITIES, ALL AREAS WILL RECEIVE A PERMANENT VEGETATIVE' COVER. POND/NG OR FLOODING, HIGH WATER CAPACITY,, AND MODERATELY HIGH TO HIGH KSA T. 3.35 MULCHING. APPLICA77ON OF PLANT RESIDUES OR OTHER SUITABLE MATERIALS TO THE SOIL SURFACE. TO 36C - HAYESVILLE LOAM -77 TO 157 SLOPES SOIL IS WELL DRAINED, WITH PREVENT EROSION BY PROTECTING 7HE SOIL SURFACE FROM RAINDROP IMPACT AND REDUCING MORE THAN 80 INCHES TO THE WATER TABLE. MADE FROM RESIDUUM rznm FABRIC THE VELOCITY OF OVERLAND FLOW. TO FOSTER THE GROWTH OF VEGETA7ON BY INCREASING WEATHERED FROM GRANITE AND GNEISS, THIS SOIL HAS CONVEX ENTIMCMM e' AVAILABLE MOISTURE AND PROVIDING INSULAT70N AGAINST EXTREME HEAT AND COLD. AREAS DOWN -SLOPE AND CONVEX ACROSS -SLOPE SHAPE. NO FREQUENCY OF aoMPACM SOM S' -� i WHICH HAVE BEEN PERMANENTLY SEEDED SHOULD BE MULCHED IMMED / A7ELY FOLLOWING POND/NG OR FLOODING, HIGH WATER CAPACITY, AND MODERATELY HIGH -I -`M I SEEDING. AREAS WHICH CANNOT BE SEEDED BECAUSE OF THE SEASON SHOULD BE MULCHED To HIGH KSA T. �-� a =L I1-- = I -(III USING ORGANIC MULCH. MULCH MAY BE USED TOGETHER WITH PLAN77NGS OF TREES, SHRUBS, Ill LEI11`- T�T�LI I _ i I M-111I I I �i se 10. _u -11- 1 -11" 1 11-1 I� -I II- r� -11�L� 1��- �1LH1111 1� =�- OR CERTAIN GROUND COVERS WHICH DO NOT PROVIDE ADEQUATE SOIL STABILIZA7ON BY 77 - R/VERV/EW- CHEWACLA COMPLEX -07 TO 29' SLOPES. SOIL IS WELL X11 =1 -I i L I i SIT T -I I -1 IL-� =- THEMSELVES, CAN BE USED IN CONJUNCTION NTH TEMPORARY SEEDING. DRAINED, WITH MORE THAN 80 INCHES TO THE WATER TABLE. MADE Tl III -Il i i -li- -T1- - FROM ALLUVIUM DERIVED FROM IGNEOUS ROCK, THIS SOIL HAS LINEAR 1111 I -1�� ,.36 SOIL STABILIZA7ON BLANKETS & MATTING: 'IF 7ON OF A PROTECTIVE COVERING BLANKET OR A SOIL STABILIZA7ON MAT ON A DOWN -SLOPE AND LINEAR ACROSS -SLOPE SHAPE. NO FREQUENCY OF THE INSTALLA e• PREPARED PLANTING AREA OF A STEEP SLOPE, (BLANKET) OR SHORELINE. TO A/D /N POND/NG AND OCCASIONAL FREQUENCY OF FLOODING, HIGH WA TER CONTROLLING EROSION ON CRI77CAL AREAS BY PROVIDING A MICROCLIMA7E WHICH PROTECTS CAPACITY, AND MODERATELY HIGH TO HIGH KSAT. YOUNG VEGETATION AND PROMOTES ITS ESTABLISHMENT. APPLIES ON SHORT, S7EEP SLOPES DD TEMPORARY DIVERSION WHERE EROSION HAZARD IS HIGH AND PLANTING IS LIKELY TO BE TOO SLOW IN PROVIDING ADEQUATE PROTECTIVE COVER. MAX. WRIER LEVEL 4" MINIMUM FREEBOARD c7 16" DIAMETER FILTREXX(D SOXXT" (ALSO AVAILABLE IN 8", 12" AND 24" DIAMETERS) 2'X 2"X 36" WOODEN STAKES PLACED 10' O.C. SINGLE INSTALLATION SECTION NTS 3.38 TREE PRESERVATION AND PROTECTION: FILTREXX® RUNOFF DIVERSION SECTIONS PROTECTION OF DESIRABLE TREES FROM MECHANICAL OR 07HER INJURY DURING LAND DISTURBING AND CONSTRUCTION ACTIVITY. TO ENSURE THE SURVIVAL OF DESIRABLE TREES INTS WHERE THEY MLL BE EFFECTIVE FOR EROSION AND SEDIMENT CONTROL, WATERSHED PROTECTION, LANDSCAPE BEAU77F/CA770N, DUST AND POLLUTION CONTROL, NOISE REDUCTION, 1. SET POSTS AND EXCAVATE A 4 "X4" 2. STAPLE WIRE FENCING TO THE POSTS. SHADE AND OTHER ENVIRONMENTAL BENEFITS WHILE THE LAND IS BEING CONVERTED FROM TRENCH UPSLOPE ALONG THE LINE FOREST TO URBAN -TYPE USES. APPLIES IN TREE- INHAB17ED AREAS SUBJECT TO LAND OF POSTS DISTURBING ACTIVITIES. J,39 DUST CONTROL. SEDIMENT BASIN BAFFLE DETAIL REDUCING SURFACE AND AIR MOVEMENT OF DUST DURING LAND DISTURBING, DEMOLITION AND NO SCALE CONSIRUC770N AC17V /TIES. TO PREVENT SURFACE AND A/R MOVEMENT OF DUST FROM % / EXPOSED SOIL SURFACES AND REDUCE THE PRESENCE OF AIRBORNE SUBSTANCES WHICH MAY �-' SHEETS OF 4 x8'x ' EXTER /OR PRESENT HEALTH HAZARDS, TRAFF /C SAFETY PROBLEMS OR HARM ANIMAL OR PLANT LIFE I /� j PLYWOOD OR EQUIVALENT DUST CON7ROL MEASURES SHALL BE EMPLOYED TO PREVENT SURFACE AND A/R MOVEMENT OF J F DUST DURING CONS7RUC770N. MEASURES EMPLOYED SHALL BE IN ACCORDANCE WITH THE - I /- 1I I I I RISER CREST ELEVAT /ON VESCH. / 1 ( I -1 I �'-� 11 I I I 1 1 1 / �' G� 1 =_I, / ��' G�J , 4 I POSTS MIN. SIZE 4" SQUARE /,1 1 I i ( 1 /1 1= OR 5 ROUND. SET AT / = - / = - F _ -1 11 :1 11=1 y I 11- -1 1=-1 11_ lid LEAST 3 INTO THE GROUND LO _III -1 f 1_� Imo► I 1 =1 I I -f 81 1 -III t I -1 1 l � J. ATTACH THE FILTER FABRIC TO THE WIRE FENCE AND EXTEND lT INTO THE TRENCH. SIL T FENCE S .(WI TH WIRE SUPPORT. os -2 NO SCALE FLOW -- --I"- CURB INLET -- O --� CONCRETE BLOCK WIRE SCREE - GRAVFL* FILTER OR #5 COARSE AGGREGATE. a BLOCK & GRAVEL CURB INLET SEDIMENT FIL TER �� -$ NO SCALE La IIIIIIIIIIIII TABLE 3-41-B ACCEPTABLE TEMPORARY SEEDING .PLANT b1ATERLILS '(HICK REFERENCE FOR ALL REGIONS' Rate Plu ting Date s saadcl abs.1acre) Sept. i - Feb. 15 50/5014Eix of Annual Rycgrdss ( Loliuip multi- aorun11 At 50-100 Cereal (Winter) Rye . fs=ale; c eate) Feb. 16. - Apr. 30 Annual Ryegruss 60- 100 (Lo1iuirLmu4xz0z mn0 May 1 - Aug 31 German Millet 50 (Setarca itali ) Source: %'& 'DSWC 4. BACKF /LL AND COMPACT THE EXCA VA TED SOIL. EXTENSION OF FABRIC AND WIRE INTO THE TRENCH. SL ALBBMARLE COUMtY .RM 7C M1. 91-ft nlwatr top alo ..r 21A RVOW aMUarn, omp, SIDE FIEYAT(ON AoallsztArt we Exam �7C Irl. ►T 1M101•MM1OC Sa OFOf P t 1 ,r WL > _s P1 AMM M YMM Qrdd= a 40 PLAN VM INS QtfElp PAL 11011!1 W RaI1B3S RA {1.11 y oPOY111cM ter 1 1 twual tY IrA> Peoa►11ro wrr r & EODE Qf pxs1 - SECTION A-A wM A INKY W= MAP W to a MMMM WM A UN GM 1MY1 N= OL Cr 1.6' 3 PA%W 7w ME em s w SZ& ON ss��QQW� SLOPES, STRIPS NETI7NGOTECTIVE COVERINGS ATTACH FILTER FABRIC TO STAKES OLD POSTS & EXTEND IT IN 0 TRENCH WOODEN STAKE S EEL POST , LENGTH = 5 VIN. EXCA VA TED SOIL COMPACTED AND 4 "x4" TRENCH J S/L T FENCE sF (WITHOUT W/RE SUPPORT) 05- NO SCALE 1992 3.11 a i s i i + 1 -. _x_11 , :: = �:::.... -11� X111 =_ 11 :i . . . p�1111 l X11 - J11 = hilt :t11�=0 _ x1111 � 1111 _ .- '�,'•.- -- "' 1.. 11111: 11 __ lilli =�1111 - _- Source: Va. DSWC Plate 3.11 -1 SAFETY FENCE PERSPECTIVE VIEW PERSPECTIVE 'VIEW PERSPECTIVE VIEW PLASTIC FENCE- METAL FENCE 'ce: Adapted from Conwed Plastics and Plate 3.01 -1 MAY BE APPLIED ACROSS BERM THE SLOPE. - - BR WHERE THE MATERIALBOVE ATTHE ERM AND ANCHOR I - BEHIND THE BERM. _ - _ - :,, BRING MATERIAL DOWN TO A LEVEL AREA BEFORE STEEP TERMINATI,IG THE /NSTALLAT/ON1e TURN THE END SLOPE UNDER 4 AND STAPLE AT 12 INTERVALS. :: 12" IN DITCHES APPLY PROTECTIVE COVERING PARALLEL t'O THE DIRECTION OF FLOW. USE CHECK SLOTS AS REQUIRED. AVOID JOINING MATERIAL IN THE CENTER OF THE DITCH IF AT ALL POSSIBLE. PR E C00#WG PARALLEL TO THE DIRECTION OF FLOW AND ANCHOR SECURELY. BIM SOIL STABILIZATION BLANKET NOTE• TREATMENT 1 SOIL STABIUZA77ON MATTING MATERWL SHALL BE INSTALLED AS NO SCALE REQUESTED BY THE ALBEMARLE COUNTY EROSION CONTROL INSPECTOR �f'il C v� O SCOTT R. COLLINS Z U No. 35791 � �NSIONAL f-�G z O ,a U In w 0 z O to > w ce U w Z¢ O° H H W 12 I- g z0 O 7: O O N U __j U z Imo- Q Q O a C� 1_ Ln O to =) > E w o � CO � In Z Q z o O = 51 I- O N C� w a- a. o > w cal M w ,q 1-1 T- �o -I N Ln M n M 1 in Z ■ 0) T_ M cyi 0) N M I N M N Q L \J_ co Uj i Id- 0 w S U I v I.._. D co 1-- Uj W�/ LL U) Id- W w w rQ V CD CD N z a 0 Q 0 ce w un a z Co. V) J J ti Z W Y 20 H W U) J Id- W 0 06 W _> I g w z J 0 0. I...... z 0 U Id- z W 2 C) ttW v! 06 z 0 vl 00 0. W AT 7NE OUTLETS OF PIPES OR PAVED CHANNEL SECTIONS. TO PREVENT SCOUR AT RESIDUUM WEATHERED FROM GRANITE AND GNEISS, THIS SOIL HAS STORMWATER OUTLETS, TO PR07ECT THE OUTLET STRUCTURE, AND TO MINIMIZE THE POTENTIAL CONVEX DOWN -SLOPE AND CONVEX ACROSS -SLOPE SHAPE. NO P FOR DOWNSTREAM EROSION BY REDUCING 7HE VELOCITY AND ENERGY OF CONCENTRATED FREQUENCY OF POND /NG OR FLOODING, HIGH WATER CAPACITY, AND �p STORMWA TER FLOWS APPLICABLE TO THE OLIMETS OF ALL PIPES AND ENGINEERED CHANNEL MODERA TEL Y HIGH TO HIGH KSA T. t�idERAL S1DPE j�:1 OR Lt_ss� SECTIONS. O cn 37D3 - HA YESV/LLE CLAY LOAM -157 TO 257. SLOPES. SOIL IS WELL DRAINED, KENTUCKY 31 FESCUE 128 LBS. 3.19 RIPRAP: WITH MORE THAN 80 INCHES TO THE WATER TABLE. MADE FROM RED TOP GRASS 2 LBS. A PERMANENT, EROSION- RESISTANT GROUND COVER OF LARGE, LOOSE, ANGULAR STONE WITH RESIDUUM WEATHERED FROM GRANITE AND GNEISS, THIS SOIL HAS SEASONAL NURSE CROP 20 LBS. FILTER FABRIC OR GRANULAR UNDERLINING TO PR07ECT THE SOIL FROM THE EROSIVE CONVEX DOWN -SLOPE AND CONVEX ACROSS -SLOPE SHAPE. NO FORCES OF CONCENTRA7ED RUNOFF, SLOW THE VELOCITY OF CONCENTRA7ED RUNOFF WHILE FREQUENCY OF POND /NG OR FLOODING, HIGH WATER CAPACITY, AND t50 LBS SEASONAL NURSE CROP ENHANCING 7HE POTENT /AL FOR INFILTRATION, AND TO STABILIZE SLOPES WITH SEEPAGE MODERATELY HIGH TO HIGH KSA T. PROBLEMS, AND/OR NON- COHESIVE SOILS. USE WHEREVER SOIL AND WATER INTERFACE AND FEBRUARY 16 THROUGH APRIL ANNUAL RYE THE SOIL CONDITIONS, WATER TURBULENCE AND VELOCITY, EXPECTED VEGETATIVE COVER, ETC., RIVERVIEW LOAM -07 TO 27 SLOPES SOIL IS WELL DRAINED, WITH MORE MAY 1 THROUGH AUGUST 15 FOXTAIL MILLET ARE SUCH THAT THE SOIL MAY ERODE UNDER THE DESIGN FLOW COND I TIONS 76 - THAN 80 INCHES TO THE WATER TABLE. MADE FROM ALLUVIUM DERIVED AUGUST 16 THROUGH OCTOBER ANNUAL RYE FROM IGNEOUS ROCK, THIS SOIL HAS LINEAR DOWN -SLOPE AND LINEAR NOVEMBER THROUGH FEBRUARY 15 WINTER RYE 3.31 TEMPORARY SEEDING. ACROSS -SLOPE SHAPE. NO FREQUENCY OF POND/NG & OCCASIONAL NOTES: 7HE ESTABLISHMENT OF A TEMPORARY VEGETATIVE COVER ON DISTURBED AREAS BY SEEDING FREQUENCY OF FLOODING, HIGH WATER CAPACITY, AND MODERATELY WITH APPROPRIATE RAPIDLY GROWING ANNUAL PLANTS TO REDUCE EROSION AND HIGH TO HIGH KSA T. 1. LIME AND FERTILIZER NEEDS SHALL BE DETERMINED BY SOIL SEDIMENTATION BY STABILIZING DISTURBED AREAS THAT WILL NOT BE BROUGHT TO FINAL TESTS AND APPLIED IN ACCORDANCE WITH VESCH STD. 3.32. GRADE FOR A PERIOD OF MORE THAN 30 DAYS TO REDUCE DAMAGE FROM SEDIMENT AND CHEWACLA SILT LOAM -07 TO 27 SLOPES. SOIL IS SOMEWHAT POORLY 2. SEEDINGS TO BE MULCHED IMMEDIATELY UPON COMPLETION RUNOFF TO DOWNS7REAM OR OFF -SITE AREAS, AND TO PROVIDE PROTEC7ON TO BARE SOILS 16 _ DRAINED, WITH MORE THAN 80 INCHES TO THE WATER TABLE. MADE OF SEED APPLICATION, IN ACCORDANCE w/ vESCH STD 3.35. EXPOSED DURING CONSTRUCTION UN77L PERMANENT VEGETATION OR OTHER EROS /ON CONTROL FROM RESIDUUM WEATHERED FROM GRANITE AND GNEISS, THIS SOIL HAS SrAaluzED• MEASURES CAN BE ESTABLISHED. LINEAR DOWN -SLOPE AND LINEAR ACROSS -SLOPE SHAPE. NO AREE PERMANENT SEEDING SCHEDULE FREQUENCY OF POND /NG & OCCASIONAL FREQUENCY OF FLOODING, HIGH PS ,332 PERMANENT STABIIL/ZATION, WA TER CAPAC /TY, AND MODERA TEL Y HIGH TO HIGH KSA T. NO SCALE 7HE ESTABLISHMENT OF PERENNIAL VEGETA 77VE COVER ON DISTURBED AREAS BY PLANTING SEED. TO REDUCE EROSION AND DECREASE SEDIMENT YIELD FROM DISTURBED AREAS TO 368 - HAYESVILLE LOAM -27 TO 77 SLOPES SOIL IS WELL DRAINED, WITH STD. &SPEC. 3.32 OF VIRGINIA EROSION & PERMANENTLY STABILIZE DISTURBED AREAS IN A MANNER T VAT IS ECONOMICAL, ADAPTABLE TO MORE THAN 80 INCHES TO THE WATER TABLE. MADE FROM RESIDUUM SEDIMENT CONTROL HANDBOOK, 3RD ED.) SITE CONDITIONS, AND ALLOWS SELEC77ON OF THE MOST APPROPRIATE PLANT MATERIALS. TO WEATHERED FROM GRANITE AND GNEISS, THIS SOIL HAS CONVEX :" AT LOW END OF DEVICE POINTED DOWNHILL To PREVENT KMDM TOTE&_ REMOVE SEDIMENT FIRM THE UPSLOPE SIDE OF THE 50)00' WHEN ACCUMULATION HAS REACHED 1/2 OF EFFECTIVE HEIGHT OF SOXX"` 2 SLOPES GREATER THAN 5% MAY RMUIREADDITIONA. STARILIZATION PRACTICES 3. SOXXTM MAY BE SEEDED AT THE TIME OF INSTALLATION IMPROVE WILDLIFE HABITAT. TO ENHANCE NATURAL BEAUTY. UPON COMPLETION OF DOWN -SLOPE AND CONVEX ACROSS -SLOPE SHAPE. NO FREQUENCY OF FlLTREXX� RUNOFF DIVERSION ACTIVITIES, ALL AREAS WILL RECEIVE A PERMANENT VEGETATIVE' COVER. POND/NG OR FLOODING, HIGH WATER CAPACITY,, AND MODERATELY HIGH TO HIGH KSA T. 3.35 MULCHING. APPLICA77ON OF PLANT RESIDUES OR OTHER SUITABLE MATERIALS TO THE SOIL SURFACE. TO 36C - HAYESVILLE LOAM -77 TO 157 SLOPES SOIL IS WELL DRAINED, WITH PREVENT EROSION BY PROTECTING 7HE SOIL SURFACE FROM RAINDROP IMPACT AND REDUCING MORE THAN 80 INCHES TO THE WATER TABLE. MADE FROM RESIDUUM rznm FABRIC THE VELOCITY OF OVERLAND FLOW. TO FOSTER THE GROWTH OF VEGETA7ON BY INCREASING WEATHERED FROM GRANITE AND GNEISS, THIS SOIL HAS CONVEX ENTIMCMM e' AVAILABLE MOISTURE AND PROVIDING INSULAT70N AGAINST EXTREME HEAT AND COLD. AREAS DOWN -SLOPE AND CONVEX ACROSS -SLOPE SHAPE. NO FREQUENCY OF aoMPACM SOM S' -� i WHICH HAVE BEEN PERMANENTLY SEEDED SHOULD BE MULCHED IMMED / A7ELY FOLLOWING POND/NG OR FLOODING, HIGH WATER CAPACITY, AND MODERATELY HIGH -I -`M I SEEDING. AREAS WHICH CANNOT BE SEEDED BECAUSE OF THE SEASON SHOULD BE MULCHED To HIGH KSA T. �-� a =L I1-- = I -(III USING ORGANIC MULCH. MULCH MAY BE USED TOGETHER WITH PLAN77NGS OF TREES, SHRUBS, Ill LEI11`- T�T�LI I _ i I M-111I I I �i se 10. _u -11- 1 -11" 1 11-1 I� -I II- r� -11�L� 1��- �1LH1111 1� =�- OR CERTAIN GROUND COVERS WHICH DO NOT PROVIDE ADEQUATE SOIL STABILIZA7ON BY 77 - R/VERV/EW- CHEWACLA COMPLEX -07 TO 29' SLOPES. SOIL IS WELL X11 =1 -I i L I i SIT T -I I -1 IL-� =- THEMSELVES, CAN BE USED IN CONJUNCTION NTH TEMPORARY SEEDING. DRAINED, WITH MORE THAN 80 INCHES TO THE WATER TABLE. MADE Tl III -Il i i -li- -T1- - FROM ALLUVIUM DERIVED FROM IGNEOUS ROCK, THIS SOIL HAS LINEAR 1111 I -1�� ,.36 SOIL STABILIZA7ON BLANKETS & MATTING: 'IF 7ON OF A PROTECTIVE COVERING BLANKET OR A SOIL STABILIZA7ON MAT ON A DOWN -SLOPE AND LINEAR ACROSS -SLOPE SHAPE. NO FREQUENCY OF THE INSTALLA e• PREPARED PLANTING AREA OF A STEEP SLOPE, (BLANKET) OR SHORELINE. TO A/D /N POND/NG AND OCCASIONAL FREQUENCY OF FLOODING, HIGH WA TER CONTROLLING EROSION ON CRI77CAL AREAS BY PROVIDING A MICROCLIMA7E WHICH PROTECTS CAPACITY, AND MODERATELY HIGH TO HIGH KSAT. YOUNG VEGETATION AND PROMOTES ITS ESTABLISHMENT. APPLIES ON SHORT, S7EEP SLOPES DD TEMPORARY DIVERSION WHERE EROSION HAZARD IS HIGH AND PLANTING IS LIKELY TO BE TOO SLOW IN PROVIDING ADEQUATE PROTECTIVE COVER. MAX. WRIER LEVEL 4" MINIMUM FREEBOARD c7 16" DIAMETER FILTREXX(D SOXXT" (ALSO AVAILABLE IN 8", 12" AND 24" DIAMETERS) 2'X 2"X 36" WOODEN STAKES PLACED 10' O.C. SINGLE INSTALLATION SECTION NTS 3.38 TREE PRESERVATION AND PROTECTION: FILTREXX® RUNOFF DIVERSION SECTIONS PROTECTION OF DESIRABLE TREES FROM MECHANICAL OR 07HER INJURY DURING LAND DISTURBING AND CONSTRUCTION ACTIVITY. TO ENSURE THE SURVIVAL OF DESIRABLE TREES INTS WHERE THEY MLL BE EFFECTIVE FOR EROSION AND SEDIMENT CONTROL, WATERSHED PROTECTION, LANDSCAPE BEAU77F/CA770N, DUST AND POLLUTION CONTROL, NOISE REDUCTION, 1. SET POSTS AND EXCAVATE A 4 "X4" 2. STAPLE WIRE FENCING TO THE POSTS. SHADE AND OTHER ENVIRONMENTAL BENEFITS WHILE THE LAND IS BEING CONVERTED FROM TRENCH UPSLOPE ALONG THE LINE FOREST TO URBAN -TYPE USES. APPLIES IN TREE- INHAB17ED AREAS SUBJECT TO LAND OF POSTS DISTURBING ACTIVITIES. J,39 DUST CONTROL. SEDIMENT BASIN BAFFLE DETAIL REDUCING SURFACE AND AIR MOVEMENT OF DUST DURING LAND DISTURBING, DEMOLITION AND NO SCALE CONSIRUC770N AC17V /TIES. TO PREVENT SURFACE AND A/R MOVEMENT OF DUST FROM % / EXPOSED SOIL SURFACES AND REDUCE THE PRESENCE OF AIRBORNE SUBSTANCES WHICH MAY �-' SHEETS OF 4 x8'x ' EXTER /OR PRESENT HEALTH HAZARDS, TRAFF /C SAFETY PROBLEMS OR HARM ANIMAL OR PLANT LIFE I /� j PLYWOOD OR EQUIVALENT DUST CON7ROL MEASURES SHALL BE EMPLOYED TO PREVENT SURFACE AND A/R MOVEMENT OF J F DUST DURING CONS7RUC770N. MEASURES EMPLOYED SHALL BE IN ACCORDANCE WITH THE - I /- 1I I I I RISER CREST ELEVAT /ON VESCH. / 1 ( I -1 I �'-� 11 I I I 1 1 1 / �' G� 1 =_I, / ��' G�J , 4 I POSTS MIN. SIZE 4" SQUARE /,1 1 I i ( 1 /1 1= OR 5 ROUND. SET AT / = - / = - F _ -1 11 :1 11=1 y I 11- -1 1=-1 11_ lid LEAST 3 INTO THE GROUND LO _III -1 f 1_� Imo► I 1 =1 I I -f 81 1 -III t I -1 1 l � J. ATTACH THE FILTER FABRIC TO THE WIRE FENCE AND EXTEND lT INTO THE TRENCH. SIL T FENCE S .(WI TH WIRE SUPPORT. os -2 NO SCALE FLOW -- --I"- CURB INLET -- O --� CONCRETE BLOCK WIRE SCREE - GRAVFL* FILTER OR #5 COARSE AGGREGATE. a BLOCK & GRAVEL CURB INLET SEDIMENT FIL TER �� -$ NO SCALE La IIIIIIIIIIIII TABLE 3-41-B ACCEPTABLE TEMPORARY SEEDING .PLANT b1ATERLILS '(HICK REFERENCE FOR ALL REGIONS' Rate Plu ting Date s saadcl abs.1acre) Sept. i - Feb. 15 50/5014Eix of Annual Rycgrdss ( Loliuip multi- aorun11 At 50-100 Cereal (Winter) Rye . fs=ale; c eate) Feb. 16. - Apr. 30 Annual Ryegruss 60- 100 (Lo1iuirLmu4xz0z mn0 May 1 - Aug 31 German Millet 50 (Setarca itali ) Source: %'& 'DSWC 4. BACKF /LL AND COMPACT THE EXCA VA TED SOIL. EXTENSION OF FABRIC AND WIRE INTO THE TRENCH. SL ALBBMARLE COUMtY .RM 7C M1. 91-ft nlwatr top alo ..r 21A RVOW aMUarn, omp, SIDE FIEYAT(ON AoallsztArt we Exam �7C Irl. ►T 1M101•MM1OC Sa OFOf P t 1 ,r WL > _s P1 AMM M YMM Qrdd= a 40 PLAN VM INS QtfElp PAL 11011!1 W RaI1B3S RA {1.11 y oPOY111cM ter 1 1 twual tY IrA> Peoa►11ro wrr r & EODE Qf pxs1 - SECTION A-A wM A INKY W= MAP W to a MMMM WM A UN GM 1MY1 N= OL Cr 1.6' 3 PA%W 7w ME em s w SZ& ON ss��QQW� SLOPES, STRIPS NETI7NGOTECTIVE COVERINGS ATTACH FILTER FABRIC TO STAKES OLD POSTS & EXTEND IT IN 0 TRENCH WOODEN STAKE S EEL POST , LENGTH = 5 VIN. EXCA VA TED SOIL COMPACTED AND 4 "x4" TRENCH J S/L T FENCE sF (WITHOUT W/RE SUPPORT) 05- NO SCALE 1992 3.11 a i s i i + 1 -. _x_11 , :: = �:::.... -11� X111 =_ 11 :i . . . p�1111 l X11 - J11 = hilt :t11�=0 _ x1111 � 1111 _ .- '�,'•.- -- "' 1.. 11111: 11 __ lilli =�1111 - _- Source: Va. DSWC Plate 3.11 -1 SAFETY FENCE PERSPECTIVE VIEW PERSPECTIVE 'VIEW PERSPECTIVE VIEW PLASTIC FENCE- METAL FENCE 'ce: Adapted from Conwed Plastics and Plate 3.01 -1 MAY BE APPLIED ACROSS BERM THE SLOPE. - - BR WHERE THE MATERIALBOVE ATTHE ERM AND ANCHOR I - BEHIND THE BERM. _ - _ - :,, BRING MATERIAL DOWN TO A LEVEL AREA BEFORE STEEP TERMINATI,IG THE /NSTALLAT/ON1e TURN THE END SLOPE UNDER 4 AND STAPLE AT 12 INTERVALS. :: 12" IN DITCHES APPLY PROTECTIVE COVERING PARALLEL t'O THE DIRECTION OF FLOW. USE CHECK SLOTS AS REQUIRED. AVOID JOINING MATERIAL IN THE CENTER OF THE DITCH IF AT ALL POSSIBLE. PR E C00#WG PARALLEL TO THE DIRECTION OF FLOW AND ANCHOR SECURELY. BIM SOIL STABILIZATION BLANKET NOTE• TREATMENT 1 SOIL STABIUZA77ON MATTING MATERWL SHALL BE INSTALLED AS NO SCALE REQUESTED BY THE ALBEMARLE COUNTY EROSION CONTROL INSPECTOR �f'il C v� O SCOTT R. COLLINS Z U No. 35791 � �NSIONAL f-�G z O ,a U In w 0 z O to > w ce U w Z¢ O° H H W 12 I- g z0 O 7: O O N U __j U z Imo- Q Q O a C� 1_ Ln O to =) > E w o � CO � In Z Q z o O = 51 I- O N C� w a- a. o > w cal M w ,q 1-1 T- �o -I N Ln M n M 1 in Z ■ 0) T_ M cyi 0) N M I N M N Q L \J_ co Uj i Id- 0 w S U I v I.._. D co 1-- Uj W�/ LL U) Id- W w w rQ V CD CD N z a 0 Q 0 ce w un a z Co. V) J J ti Z W Y 20 H W U) J Id- W 0 06 W _> I g w z J 0 0. I...... z 0 U Id- z W 2 C) ttW v! 06 z 0 vl 00 0. W SHEET NO. 29 N V) O a 0 a C 0 0 a a: 0 0 a 06 C z 6 (Y =w Cw z Q C z 0w 0 z 0- _j J C 0 O U 0- W O 3- 3 N C C O U Q) C U O C t 0 O 3 a � CO Q) 0 a a x �Q) O C � >1 � 0 E o a :5 0 .3: C, 7 C Y 1i s , 0 _D C 0 ,j - U n 0 = N J C D O U o O - c 0 ac� o C a� >-0 Cn 0 c V O x z O U ,- c , o 0 O N C -0 E N :3 E U •- o - 0- O 0 C 0 N a... 0 0 U .0 O in V) ; _ -\ __ S S - -- s - -STO E OUTFALL INTO TRAP' - - - - _ Y �\ \\ \ \ \ \ � \\ \` � \ - / _ I \ \\ II LEGEND �LTH �� " I ` \\ ✓ / i _ _/ \ J i / 6'Wx5'Lx2_D_ (TYP.) / . - - - - _ - - - \ \ \\ \ \ \ \ ` - - - - / \ SF SILT FENCE PER VESCH 3.05 (��N � �� / - _ _ y , -_ ; \ \ \ \ \\ \\ \ \i�\ \ / / \ \ \ LIMITS OF LAND DISTURBANCE ___ �, / �\ • _ • �= ! �' ��\ J1 � - - - -_ -- - - - -�/ � / //' /� /' _ _- __-- -____` \ \ \ \\ \ \\ \� \ ` \ \` - � ___1 / / �/ \ \ \ DIVERSION DIKE SSF SUPER SILT FENCE PER VESCH 3.05 �� I -1 / / - _ _ \ \ • �' \ \ \ {� BOUNDARY LINE \ \ \ � / - - - - - -' / ' - - - _ _ \ \ \ \ \ \ \ \ l` \ \ _~ \ / / \ \ V V V DQ DIVERSION DIKE PER VESCH 3.09 T R. COLLINS Z //- \ - - - \ \\ 11 /, �� _ - - -_ _ - /'� �- _ \\ \ \ \ \ \ \ \ \ _ / / \ \ SILT FENCE � / \ \ \ -_ _ � - -- - - _- ___ _- - _1 _ _ / ' \ \ \ ` \ \ \\ \ \� � •-- � ` \ / / \ \ TREE PROTECTION o. 35i 91 , �' 1 ....� -- - \�� - - - = _ _ _ = ' - - - -' ' _ _ _ \ \ \ / ' \ \ \ \ \ \ \ \ \ \ \ \ \ / / / \ +�- DIRECTION OF FLOW ST SEDIMENT TRAP PER VESCH 3.16 -� r - - - _ _ -I _ max` _ _ _ _ __ __ _ _ _ _ _ _ _ _ ` ` _ \ \ _ _ , \ _ PI 20POSED TREE \ \ ! � 1 \\ \ \ \ \ \ \ \ \ \ \, \ \ - / / / / \ \ \ CE CONSTRUCTION ENTRANCE PER VESCH 3.02 e \ -_ �. _ _'_ _ _ _ _--_ ___ -_ -_ -_- - - - _ _ ` \ ROTECTION FENCING_ - l \ \ \ 1 \ \ \ \ \ \ / / 653.75 PROPOSED CONTOUR O �� r \ - - - '�' - ____ - -- _- ,_ _ _ _ \ _ _ ,I \I\ ` - -` - , - - _ f --- - _ _ - _ - - - - - - _ \ ` � \ ` - ROPOSED 24" DIVERSION BERM �.J \\ \ \ 1 \ I \ \ \ \ \ \\ \ '� \ \ \ \ \ / / / CULVERT INLET PROTECTION VESCH 3.38 _ _ - - - - - _ __ ___ � - _ _ _ _ _ - - - - \ \ \ \ \ \ \ \( \ \ \ \ \ \ \ \ \ \ \ \ \ / '__� 1 \ OP OUTLET PROTECTION PER VESCH 3.18 _ _ - - ---- --- _ - _ - _ _- - - - \ \\ \ \ \ \ \ / I I \ _ - _ _ _ _ _ - - � -• - _ � \ \ \ \� \ \ \, \ / CULVERT INLET PROTECTION PER VESCH \ \\ _ - _- - - - -_ - ' '. -'- Y' �" _- `' ` -- -- -j - -\` \`\ \ � \ \ \ \\ \ _\ \ \\ � \ \ 1, \ / / / I I ® CHECK DAMS CIP 3.08 1*1 ' _ - - - - - - - � � , \ \ \ \ \ \ \ \ \ • \ \ \ \ } \ / ROCK CHECK DAMS PER VESCH 3.20 \ \ / ,`� __ ------- - -_ -._ - - -- -�;` � _ I- - - - - -� _` \ \\ \�_ ___ 1 - -- -�_ � \ \\ \ \ \\ \ \ \ \ \�_ \\ \\ \ \ \ 1 \ \ / / 1___1 / CD \ I- / �/ � I - - - - �"" - - - _ _ ` - / - - ' 2 '� �`.:�.� _____�' \ � \\ -- - - -, - - \ \ \ \ \ \ \ \\ \ \ \ \ \ \\ \ \ \ \ \ \ \ _ ' \ \ \ `\ \ \ \ \ \ ' ` � \_ - �' \ / / � I I mss. .......,. 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I / "I I PHASE `I 1 \ \ �\ \ \ \ \ \ \ \ \ I \ \ \\ \ \ \ \ `\ _ - _ - PAVED CONSTRUCTION ENTRANC \ \ "' \ \ \ \ \ \ \ \ \ \\ - -- / / / \ I ' \ / / I I \ \ \ \\ \\ \ (\ \\ \\ 0 I E 1.00 ACREs I / / CE \ 1 \ \ \ \ \ \ \\ \ \ \ / I \ \ \ \ \ \ \, / ` 1 \ _ ii \ \ 1 \ \\ \ \ W ( / -� W/ WASH RACK MIN. 12 x70 CW =0.4 I \ \ \ \ \ \ \ \ \ \\ \ \ \ \ \ \ 1 / I \ \ \ \\ \ \ \ / ' I / / - � � / ) ) � I I I \ \ \ \\ ' \ s��s I � \ \\ \ \\ \ \ \ \ \ \\ \ \ \ / I \ \\ \ \\ \ �� - / \ I I I \ / - - / I 1 \ ( `sue, I- I W� W I 1 / \\ \ Tc =5 min. \ \ i, \ \ \ \ \ V\\ \ \ \ \ \ \ \ 1 I \ \ \ \ \ / / / \ / / 1 I I I I f I / t \ \ \ \ \ \ \ \ \ 1 I \ \ \\\ \ �� \ I \ / / I { \ VNNA STREET R/ - I \ � I \ \ \ \ \ \ \ l \ \ \ / / / / 11 v• p L : �D' � v \ \ - \ \ \ \ \ \\ \ \ \\ \ \ \ \ / �'-� / / ` / f 113C I �� 0 � \ I I \ \ \ \ \ \ \ \ \\ \ \ \ \� \ \ / I I ` / / // /// / �o I OPROPOSED 24 DIVERSION BER \, \ \ \ \ \\ \ \ \ \\ \\ \ \ \ IV 3\ ` ` \ � ( I \ / / \ / / / I / / / /% \ \ \ ` -_ I I EX WESTHALL PHASE V ( I I � I / % ' l- \ \ \ \ \ \ \ \\ \ \\\\\\\ \ \ p NI 59 � \. - / I I � - ..� / / / / -� "'� / / / / // ( / / /�� FINAL GRADING I It \ I 1 \ \ \ \ \ \�\ \ \ \\ \ \\ \,\\\\\\\ \\ \ � \ \ -_ - / \ I I \ / -_ / / / ' '.-----I------ _ �- / i I I I I � 1 -t \ \ \ \ \ \ \ \ \ \ \ I I / / / / // / / / �- I � _ \ \\ \\ \ \\ \ \ \\ \ \ \ \ \ • \ \ \ I / / / / / POW ) \ \ \ \ \\\ \\ \ �' \ \ \ I I I \ / // / / \ / //, -- cn _ III 1 1 / \ ` \ \\ \ \ \\ \\ \\ \\ \\ \ \\ \ \\ \ \• .\ \\ \ - I \ � / / / // / / - - - � / / I—, / / // / � i % /// III I i I / / I \ \ \ \ \ \\ \\ \\\ \ \ \ \\ \ \\ \\ \ �/ 9' / - - / / / j // / / /i/ /� it I � I Jill 11 I / / / I /\ \ \ \ \ \ \ \ \\ \\ \ \ \\ \ \ \ \ \ \ � - / / / �/ / // / / /\ /_ _ / / / V J uj III / \ \ ` \ \ \ \ \ \ \\ \ \ \ \ \ \ \ \ e \ - / / / / / // \ �r I I I I I I I i ! PROPOSED TREE,/ / / II \\ \ \\ \\ \\ \ \ \\ \� \ \ \ \ \\ \ \ \\ \ 1 \ ' . \ \ \ �� \ ` _ - f / '// ./ / / / / _ Z/ / // // / / X'__ Z o I / I I III I / % OPROTECTION FENCIN / � I \ \ `'� \\ \ \\ \ \\ \ \\\�� \\ \ \ \ \ cS' \\ \ \ � � I I \ �- _ J / / / / / / // / / I I � ( TYP.) / / / \ \ \ \, ` \ \ \ \ \\ \ \ \ \ �` / / �' / / / L / // ;i\ O _ --- -� - I 1 / I \ \ \ \ \ \ \ - _ / / / j 1 1 i 1 / / / I \ \�\ \ \ \�\ \� \\ \ \\ �\ \\ \ - - - - - -- / / / /// / / / / / / / / / � / / \ \ \ \ \ \ \ R0�'OS'ED TREE _ \ \ � \ \ / / ' / '� / / / / / / _/_ - / / I I I l I i I i cb r / / / / / \ \ \ \ \ \ \\ ROTECTION FENCING 0 \ \ \ \ \ \ \ \ _ � ` - ' / / / / --_ / l / / / / / N 11 I I 1- / / / / / \ \ ` \ TYP. �' \ \ \ 1 - / / / � / / S I -- -\ _ 30 TEMPORARY GRADING I I I i I / / ' \ \ ` \ \ ' • ' I \ \ \ ` 1 / __� / / / EASEMENT FOR FUTURE I I I I / / , -1 \ \ \ \ \ \ \ \ \ \ \�\ \ \ I \ \ - -_ - - / / / � / // // I I I I __�____ � {- / /� � / // // / �,\ \ \ \ \ \ \\ \ \ \V- \ \ \ , \ -_. / / / / / / / / / / // x - iii CONSTRUCTION OF EASTERN I 1 , / / / , , - I \ \ \�\ \ \ \ \ \\\\ \ \ \ / \ \ \ \ \ � - -- - - � / / / / / I--,- / ,/ � -- _ AVENUE CONNECTOR TO BE - - c I i I I 1 / / / - I \ \ \\ \ \ \ \\ \ \ \\ \ \ \ , 1 �\ \ \ \ _ / % i / / / / - ce 11 VACATED WHEN EASTERN I I I / / . I \ \\ \�\ \ \\\\ \\ \ \ \� \ \\ \ \ \ \ � _ _ -- - -- i / / / / ' % / / / / - \ - AVENUE IS CONSTRUCTED I I I I ( 1 , - / ! , � 5s /' /-- - \I \ \ \\ \ \ \\\ \\ \\ \ \\ \\ \ I \ `�'\ --- I\ � / // i � / --- ' / / / / - - g/ I I \ - / / SEDIMENT /' /' -_ I \ \ \ \ r _ \ ` - \ __ / / / __ / / / / / � _ - -' � � / / // /� - --- _ - \ D.B. 4077, PG. 175 I i I I-' / / � / / / / / 1 \ \ \ \\ \ \ \ \\\ \\ \\ \ \\ \ \ \ \ \ \ \ � / / / � ' / / � . �� - . IIII 1 , / TRAP .S' / \ \ \ \ \\ \ \ \\\ \� _, \- \ \ \ \_ - / / / / ___1 __ / / / /�_� - '- / I (1 I I I ; // /' PH�S�E l /' / _�'\\ -__JI \\ \\ ` \ \ \ \\ \\\\\ \\\ \� \ \\� \\ \ \\� \� `_- \ \ , \ \ -_-_ _ •--- ' / „" ''f% -� /11 / // � /, / /� / /� f/ - \ / - -- - I I I / / 2< I9 ACRES- / _ - \ \ \\\\,\ \ \ \ \ \ I I / I \ \ \ \ _ _ / / / / / / �"�'�z / / i o S --- I I I I I .' / - \ \ \ \ \\ \ \ \ \ \ \� \ \ \\ \ \ \ \ `>, \\ ' \ _ -_ � / / /' /' / / /� / j / �/ -� t PROPOSED TREE { { { \__ _-_ L -_- / / / \ - -- \ �\ \\ \\ \ \ I \ \ _ / / // / / // / � / / / /// ��"'- OPROTECTION FENCIN I I I _ 1 �� / / / // _ / / /'/ /' `�\ \ \ �\ \ \ \ \\ \ \ l I \ �� - / /' // S / / /i -.-._ / I / / \ I (TYP.) I 1 1 / / / // -J / / / -I- -_� 1 \ \ \ I 1\ 1\ \ \ \ \\ \ I I \ ��\ �� ` f / - - -' �/' / / .'/ / /// �,,G° - // �/ /� /� - o \ I I I / i I 1 � _ '�\, 1 Z /' / / `'., / / - - _ - \- - _ / I 1 1 I I 1 \ \ \\ \ 1 I 1 \ \ _ , - / / / / / /// �" /_� -- - __/ � I 0 EX WE jH\ALL PWASE IV_ - I - -I-'/ / / / ' / /' / - I I I 1 I I \ \ \ \\ \\ I i 1 S ____ -__ -_ _ - i � � / , i / // / -_- - ( / Ln FIN L GR -ACfrI G I I - �"' C`- �� /' ,' / / ) I j ROPOSED. 24" DIVERSION BER DD \ / / / ! I I I \ \ 1 \\ \ _ S / / , // �% /// % -- - -- %� Ln \ I �/ / / I - I / , -- / / / / I 11 \\ I I \ \� -� � S / / //� / / -- __ -- / us N ` I / / ) / I I 1 1 I I \ I I \ - - -- = - - - -- _ - - _ / - I / / II \ - -_ / / / I i i _ / / // '_ - I 1 % // I I �,_ 1 1 /�- /// / ST5 / ! I I 1 1 0 -- / /, fit/ / 1 I l I I I \ \\ _ <- 11 - - /,r //" / ' -�/ - / i / _ { _ _I - _ ''� / _ _ _ _ / 1 I / / j / / i I i P H 583 0 / j _ - , //� /� - - \ / i / / - / - -, / _ _ ,/ / _ \ (%� / �1 \ _ - { - _ _ / / ' JAS` / / \` l��\ / I I 1 I /_� ' ' / / / / _ _ - -- _ .- _ _ / �'- _ -- '._ - _ I ! ' _ -- -_ _ 'i ' ' -/.' / �_ _. / 11 i 1 / / / � - - u- _ 1 __- ' I 1 / //' / ' /' --- I� ' / // `/! 1 � . 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I 1 I 1 ( 1I III I I I I ( _ \ \ \ \ \ \ \ \ \ - - - - -- �/ \ ` - _ I / / / % /// /' // // / (/ // / /// / -\ \ \ \� \ \i\ / // / it i 1 I I I III III 111 \0d' \STREAM bUI` I�11 -\ \ \ \ \\ \\ \ \\ \ \11 \ \ \\ \\ \ \\ \ \ \\ \ \ \� `-- __ - - -- - // \ - 1 / 1 / / / I i / / / / I I 1 I I I I \ \ \ \ \ \ \ \ \\ \ \ - - - - -- I `\ \. - / / I / / \ \ \ \ \ i 1 \ \\ \ \ \ M M M M M \ - -- , / / Il I 1 / \\ \ \ \ \ \\ \ I i i I I I \ \ I \\ \ \ \ \ \ \ I I I \ \ \ \ \\ \\ `\ \ \\ \\ \ Lu 1 _ / I / / / _ \ \ \ \ 1 \ \ \ \ \ I \ \ \ \ \ \ \ \ \ \ \ __ / , ; ¢ co o�- n I 1 \ \ \ 1 \ 1 \ I I \\ \\ \ \\ \ \ \ \ \\ 610 % / D - -_ '_ � � �__� __- - - -- / / I/ , iI i I / / \ \\ \ \ \\ I I \ \ 1� I \ \ \ \ II III \ \ \ \ \ - - - I - - - - / / I / / \ \ \ \ \ \ \ \ \ \ 1 \ \ 1 I I 1 \ \ \ \ \ \ \ / N Ln r 00 rn r-4 11 � \ \ ; wo � 0000-_ / i - - �/ / / I I I I I / �\ \\ \ \ \ \ \ / I \ \ \ 1 , \ 1 l \ \ \ \ \ I \ I 1 \,-\ \ \ \\ \ \\ \ \ \ \ - /� \\ I \ i00� l 1__ ,N, // I 1 I I I / / \ \\ \\ \1\ \ � l I I \ 1 1 I \lk 1 \ \ \\ 1 i \ I I \ \ \ \\ \ \\ \ \ \ \ \ \\ \\ \ \\ - - - -- // \ I / \ i - - - -- / / % I I/ `\ \ \ \ \ / I I 1 4 I I t I 1 \ \ ` I I \ \ \ \ \ \ \ \ \ / \ I // \ 00,00 � �'' _- � / I II /� \ \ � 11 1 f I I ' \ EI� ' I \ I � \\ \ \ �•. \ \ \ - / \ I / �� / - - - - - -- // I I I II I I / \ \_� \ \\ \ \ \ I I I 1 ♦I 1 1 I ROTE�CTIONTFENCING TP it I f1 (r \\ \\ \ \\ \\ \\ \ \\ \ \ \ \\ \`\__ _ - // \ \ I \ \ - / I I III / \ \ \ \ / /1 I I I I i \ \ \ \\ \ -- \ I ' \ / _ //- \ / ®1 I i I III / ps \\ \ \ \ \ \ \ / / I (TYP.) \ 1 1 11 I I \\ \ \ \ \ \` \ \ \ \ \\ \ \ -_ ��' \ I / \ \ / // _ - 1 I I If I \ \ \ \ \ \ /� / i 1 I I I 1 1' 1 \ \ \ \ \ \ \ I I I I I \ \ \ \ \ ! \ \ �.\ \ - - - --- - I / / / I I I \ \ \ \ I 1 1 III `1 \ \ 1 1 I I I I \ \ \ \ \ \ \ \ \" \ \ 1 11 // , \� 1 /��/ / / -\ / // j I IIII/ \\ \\ \\ 11 \\ // I I 1 I j I `II I I, \ \\ \ \ \1 11 I I II 1 I I I I\ \\ \ \ \\ \\ \\ \ `\\ \ \\ \\ \ \\ /// Lu / , _ / \ / , \ l , 1 11111 ,� \__\ \ \ \ \ , ' / / I I I i 1 1 \ \ \ \ \1\ 1 \ I I I I I \ \ \ \ \ \ \ \\ \ \ \ __ / / I \ ---'� '•```� \ �N�' /^ \ �� / / /� l IIIII / \ \ \ I \ \�� \- / ,/ l l 1 I lI ( 1 I 1 \\ \ \ \ \ ``\1' I i i I \ \ \ \� \ \ \ \ `\ \ \\ \\ \'*� - ---- - - - - -- - \ \ / / / a JI I I I I f \ i I 1 \ / / / I 1 I I I \SELECTIVE CLEARING AS EC�ESSA Y TO BE ALLOWED \ \ \ \ '`\ ' \ \ \ / ,' /'/ \\ \ f� / / / / / I I I �(oc \ I I I 1 \ \ / // I I I I \ 'BETWEEN . 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�, \\ \ \ \- ,� / /// / /� /, / / \\ \ \ \ \ , ,!- / / / / / I I '` I I i I I I I i / it \\ \ \ \ \ \ \ \\ \` /� \ \ \ N \\ , / / / \ \ \ \ 1 // / / / / / I I I I ( I \ \ \ \ \ \ \ \ \ / \ \\ \\ �z / / / / / / / \\ \ \ \ \ - --- ,/ / / / // / / I 1 I I I I I i I I I III \ \\ \ \ \ \�\ \ \ \ \ \ \ / -\ = . / / / / I I I I I I I I Ill \ \ \ \ \ \ \ \ 100 STREAM BUFFER \ \ \ \\ / / / \ \ / / 1/ / t II _ z \ \ \_,- �// // / / / / // / / // \ \ \ \\ \ \\ \` - - --' /' /' / / / / 1/ ( I I I I I I I I I / III \\ \\ \ \ \ \\ '\ \ , \ \ \\ - - - \ \ / 1 / / / / / / / \ \ \ 1 ,�/ / / / 11 I I 1 I I I I I I I \ / -// I I \\ \ \ \ \\ \\ \ \ \ \\ �- z \ \ \\ / \ \ k \\ / ,/ / / / // / \\ \ \\ \ __ ` ,- / // / ' ! / 11 I I I I l I I I \ \ \ \\ I \\ \ \\ \ \ \\ \\ \\ \11'\ /, \\ \ \\ - - - - --_ \ l \� / / ( r / / / / l \ \\ \\ \ - - -- / / / / 11 I I I ,I I I I I I I I \ \1 \ \ \ \ \ \ \ \ \ - / \ \\ \` _ �, \ // / / // / / \\ \� // / / i I I I I f I I i i i I / \ill \I \\ \ �„ \\ \\ \\ \` \\ - / /�-1 \\ "I ` -- - � \ \ / / / l _� \ - -- _ ' r ( 1 1 i I 1 1 1 I 111 1 \ \ \ \ �, � -- \ \-_ --------- -' _ \\ / 1 / - - -- `•'' t/ l � I I ,/ � I II I I i I 111 \ \\ \ \ � \ \\ �\ .-/ \ \\ \ ` -- -- \ / - -' / // j / / // // \ \\- �-'' / 1 ! / t I I I I I I I 111 \ \ \ \ \\ \\ �� \ \ S6o - - -- \ C f \_` _ // // // / \ \_ - -- --� / / / % I I I I II 11 I I // I \\ \ `\ \ \ -/ /\ \ \`------ - - - - -- - - - -- \ SELECTIVE CLEARING AS NECCESSARY TO BE ALLOWED- / l / / / / ` \ \ - - - _ _- - - - / I I I ( I I I / I \ \ \ \ \ \ A / \ \ _ _ _ - - - _ \ BETWEEN TREE PROTECTION &LIMITS OF DISTURBANCE. / I / / / / _ \ _ _ _ _ _ , / 11 / I I I I I I I I l l \\ \ \\ \ \ \ \ \ - _' \ \ + - - - - - -- - - - - - - _ _ _ _ __ \ \ \�' � \\ / /I /I ! // // // _ \\ - oc '' // 1 /l 1 , l 11 I` I I ll I \l \ \\ \ \ \\ \ "I 11 � �` / \ \ - ---- _ - - � - I / / / / / �j_ // 1/ / 11 / I I I 1 I I i I f �\ \ \ \\ \\ \ \- J/ \ ____ 570 _ ----- \ \ �,�-' -' � ,� // / // /' // // // \ - -__ -\ ` \- / // / 1 I / J \ I I I I 1 I I I \ \ \ \\ \\ `\ \ \\ \ /\ \ --- - -_-_- _ - - - - -_ �\ -' % , / / / / / , ,-\ ' / i // / / / I I I 1 lam\ I \ \\ \ \ \ - -- - -/ // / / / // /, SEDMENT, BA�kN 2 �, /. . / / `� // / / � / J, I I I �\ \\ \ \� - \ \ -_ '_ / \ // / hH ASE-I � / , / / I I I \\ \\ \ \ - - / ul / 1 \ PROPOSED LIMITS - - -'� // / / / / / / / / 4� 59 C�ES� \\ � \ - �'' /' i/ / � l / , l i / I 11 \ \ _ - / �� O -_ , _ , , \ OF DISTURBANCE _ - / / / / / / / \ \ \ / , / / / I I I \ \ \ ' \ x . / / / / x Cw =0.4 / / / / \ \ \ \. ___ _ 56 �-''� \ =27.64 AC. / / / / / Tc =11 min. \ \\ , /. / / / / / / / / \� \ \ /-~ --- __ , ,� / / / / / / / _ - \\ \ \ / , / / / / / / / i / / / \\ \ \ /// r / / / / / \ \ \ SEDIMENT / , / / / i ♦ / \\ �\ `\ - -_ / \ - - t' = / I / / / ,/ \ \ / / / / / / r / / \\ - 1 \ _ -A -- ' / / i / / \\ \ \ PHA$t I/ / / / / // . // Il \\ \ \\ \, / \ - _ _ \1 / l l l / \ \ \ , / 1.7,3 ACRES / ,/ / // / , / ` / \PR\OPOSED SAFETY FENCE ` /' \ _ _ - - - _ / / / / 1�° \ \ \ / / /' / / / ' / / NSTALL SIGNS "WARNING: SAF _ / / / Sae` \ / \ / , / / '< ` / \ _ / / / \ _ / / /, �� = - , ' QUICK SAND KEEP OUT" - ` \ \\ I / \ Tc -1,1.2 r,�Yin/ / / / /// // C •\ ' - - bo �e --- \ , / / / \ Ps / / / / / / / / / // , ` -%, ' ♦ ' - _ / \ \ � -- (-) e--- _E - - - 1-. \ N \ PROPOSED WOODEN BAFFLE ��`"' - ' ; J I I I / / /' / / //' /'/ � / / //' /� /'' ` , 1 w �B. _` / - PROPOSEIS - SAFETY F CE �� - / I I I T - - _ � / � z / / / // / /, ,/ // // SB / \11 ROPOSED WOODEN BA LE / / /'' ____ INSTALL SIGNS "WARNIN SB2 � / /� /� /i ,-� // �i / , / II / z 11 11 _ QUICK SAND, KEEP OUT "\ _ - / ( 1 / / /'i ice' j', -'" ,� / / 11 I'll "--- PROPOSED 24 CMP RISE \ _ - _ _ 1, \ `\ \ - / / i �/ / 1 / 00, -t- / _1 \� / / 0 ' - \ '�_ \ \ \ Y < \ \ - - - - - ' /�' �' i - / �' % I PROPOSED 30'' CL. 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�, \\ \ \ \- ,� / /// / /� /, / / \\ \ \ \ \ , ,!- / / / / / I I '` I I i I I I I i / it \\ \ \ \ \ \ \ \\ \` /� \ \ \ N \\ , / / / \ \ \ \ 1 // / / / / / I I I I ( I \ \ \ \ \ \ \ \ \ / \ \\ \\ �z / / / / / / / \\ \ \ \ \ - --- ,/ / / / // / / I 1 I I I I I i I I I III \ \\ \ \ \ \�\ \ \ \ \ \ \ / -\ = . / / / / I I I I I I I I Ill \ \ \ \ \ \ \ \ 100 STREAM BUFFER \ \ \ \\ / / / \ \ / / 1/ / t II _ z \ \ \_,- �// // / / / / // / / // \ \ \ \\ \ \\ \` - - --' /' /' / / / / 1/ ( I I I I I I I I I / III \\ \\ \ \ \ \\ '\ \ , \ \ \\ - - - \ \ / 1 / / / / / / / \ \ \ 1 ,�/ / / / 11 I I 1 I I I I I I I \ / -// I I \\ \ \ \ \\ \\ \ \ \ \\ �- z \ \ \\ / \ \ k \\ / ,/ / / / // / \\ \ \\ \ __ ` ,- / // / ' ! / 11 I I I I l I I I \ \ \ \\ I \\ \ \\ \ \ \\ \\ \\ \11'\ /, \\ \ \\ - - - - --_ \ l \� / / ( r / / / / l \ \\ \\ \ - - -- / / / / 11 I I I ,I I I I I I I I \ \1 \ \ \ \ \ \ \ \ \ - / \ \\ \` _ �, \ // / / // / / \\ \� // / / i I I I I f I I i i i I / \ill \I \\ \ �„ \\ \\ \\ \` \\ - / /�-1 \\ "I ` -- - � \ \ / / / l _� \ - -- _ ' r ( 1 1 i I 1 1 1 I 111 1 \ \ \ \ �, � -- \ \-_ --------- -' _ \\ / 1 / - - -- `•'' t/ l � I I ,/ � I II I I i I 111 \ \\ \ \ � \ \\ �\ .-/ \ \\ \ ` -- -- \ / - -' / // j / / // // \ \\- �-'' / 1 ! / t I I I I I I I 111 \ \ \ \ \\ \\ �� \ \ S6o - - -- \ C f \_` _ // // // / \ \_ - -- --� / / / % I I I I II 11 I I // I \\ \ `\ \ \ -/ /\ \ \`------ - - - - -- - - - -- \ SELECTIVE CLEARING AS NECCESSARY TO BE ALLOWED- / l / / / / ` \ \ - - - _ _- - - - / I I I ( I I I / I \ \ \ \ \ \ A / \ \ _ _ _ - - - _ \ BETWEEN TREE PROTECTION &LIMITS OF DISTURBANCE. / I / / / / _ \ _ _ _ _ _ , / 11 / I I I I I I I I l l \\ \ \\ \ \ \ \ \ - _' \ \ + - - - - - -- - - - - - - _ _ _ _ __ \ \ \�' � \\ / /I /I ! // // // _ \\ - oc '' // 1 /l 1 , l 11 I` I I ll I \l \ \\ \ \ \\ \ "I 11 � �` / \ \ - ---- _ - - � - I / / / / / �j_ // 1/ / 11 / I I I 1 I I i I f �\ \ \ \\ \\ \ \- J/ \ ____ 570 _ ----- \ \ �,�-' -' � ,� // / // /' // // // \ - -__ -\ ` \- / // / 1 I / J \ I I I I 1 I I I \ \ \ \\ \\ `\ \ \\ \ /\ \ --- - -_-_- _ - - - - -_ �\ -' % , / / / / / , ,-\ ' / i // / / / I I I 1 lam\ I \ \\ \ \ \ - -- - -/ // / / / // /, SEDMENT, BA�kN 2 �, /. . / / `� // / / � / J, I I I �\ \\ \ \� - \ \ -_ '_ / \ // / hH ASE-I � / , / / I I I \\ \\ \ \ - - / ul / 1 \ PROPOSED LIMITS - - -'� // / / / / / / / / 4� 59 C�ES� \\ � \ - �'' /' i/ / � l / , l i / I 11 \ \ _ - / �� O -_ , _ , , \ OF DISTURBANCE _ - / / / / / / / \ \ \ / , / / / I I I \ \ \ ' \ x . / / / / x Cw =0.4 / / / / \ \ \ \. ___ _ 56 �-''� \ =27.64 AC. / / / / / Tc =11 min. \ \\ , /. / / / / / / / / \� \ \ /-~ --- __ , ,� / / / / / / / _ - \\ \ \ / , / / / / / / / i / / / \\ \ \ /// r / / / / / \ \ \ SEDIMENT / , / / / i ♦ / \\ �\ `\ - -_ / \ - - t' = / I / / / ,/ \ \ / / / / / / r / / \\ - 1 \ _ -A -- ' / / i / / \\ \ \ PHA$t I/ / / / / // . // Il \\ \ \\ \, / \ - _ _ \1 / l l l / \ \ \ , / 1.7,3 ACRES / ,/ / // / , / ` / \PR\OPOSED SAFETY FENCE ` /' \ _ _ - - - _ / / / / 1�° \ \ \ / / /' / / / ' / / NSTALL SIGNS "WARNING: SAF _ / / / Sae` \ / \ / , / / '< ` / \ _ / / / \ _ / / /, �� = - , ' QUICK SAND KEEP OUT" - ` \ \\ I / \ Tc -1,1.2 r,�Yin/ / / / /// // C •\ ' - - bo �e --- \ , / / / \ Ps / / / / / / / / / // , ` -%, ' ♦ ' - _ / \ \ � -- (-) e--- _E - - - 1-. \ N \ PROPOSED WOODEN BAFFLE ��`"' - ' ; J I I I / / /' / / //' /'/ � / / //' /� /'' ` , 1 w �B. _` / - PROPOSEIS - SAFETY F CE �� - / I I I T - - _ � / � z / / / // / /, ,/ // // SB / \11 ROPOSED WOODEN BA LE / / /'' ____ INSTALL SIGNS "WARNIN SB2 � / /� /� /i ,-� // �i / , / II / z 11 11 _ QUICK SAND, KEEP OUT "\ _ - / ( 1 / / /'i ice' j', -'" ,� / / 11 I'll "--- PROPOSED 24 CMP RISE \ _ - _ _ 1, \ `\ \ - / / i �/ / 1 / 00, -t- / _1 \� / / 0 ' - \ '�_ \ \ \ Y < \ \ - - - - - ' /�' �' i - / �' % I PROPOSED 30'' CL. III RCP RISER /' ' f`' PROPOSED SILT FENCE \ - _ - - ~ / / i/ - / co ' •�` � ssF W /WIRE BACKING �TYP.) ` - - i = � j - / RIM = 556.93 _ /' - - i / / . ' ' '' / PROPOSED 24 \ CL. 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'.�•'.� ... . /'.'.- - \ SEDIMENT TRAP PER VESCH 3.16 T _ _ TREE PROTECTION ST RUNOFF DIVERSIO _ _ _ _ _ __ _ - - - _ _ - - \ : - _ _ \' FSROPbSt =D T EE. �� ,., \...... \.'...... \ \ � \ \ \ \ \ .� / / \ \ `�� Cn \ \ INTO ST3-- - _ _`_ -1- - _F ; - \_ _ -' - - _ - _ _ �- \ `- ` \ - ROTECTION FENCING. '..T_..:� .. •..�'.'� .. •'...'..'.. \. • . .'....:.. I/ \ \ \ \ \ \ \ \ / / _ \ 653.75 PROPOSED CONTOUR CE CONSTRUCTION ENTR4NCE PER VESCH 3.02 � C \�y� _ _ _ - - - - _ - ` \ \ - - - - - - - TIFF =5s1•" =ssF= C _ _ - - - - % - - - - - - - - - - � - ; _ (TYP.) . , , , _ - .. ' ' '�: :I.: .:. \� '':::...:�:....:• l \1 , \ \ I \ \- ,\ \ \ �\ \ \ \ \ / / / \ \ I I DRAINAGE DIVIDE TP TREE PROTECTION & PRESERVATION PER s IUNAL S� 4 -,--------- - - - - _ _ _ - _1� - - _ _ - - _ _ , _ _ _ _ _ _ _ _ _- - - - RO OS D 4" DIVERSION_BERM' 66 .` ,.\.'.'. '. \'.'.'.'.'\.-..'1.'.1'. \.'... \ \ \ ` \ \ I VESCH 3.38 - - - - - -- - j- , _ -rL- - - - -- -\ \- -- - - -- �.. \...�.... \.... \.. \.. \.... 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IP ,y \ . \ E ROW DYE �b�IV\ \\ \\ ,--� \ \ \ / I \ / / / / / / / I .I / I \ \ RO 0� (� I RS \ \ \ �,\ \ \\ \ \\ \ \ \ / \ / / / / / / // / / � / �� / /// \ , \ \\ \ \ \ \ \I \ \\ ::. / \ /Bl\ #1-\ \ \ \ -- 1 I // / / \ _� / / / f� /��i/ / , / `/: \ \ \ \ \ \ \ \\ \ \\ \ \\ \ \\ ` \ '.':'. UP -59 . \ ` / I / / / / �' � / / / / // � - - /� - / \ I \\ \ i I / / / _ - // // �// �- / - -- \ \\ \ \ \ \\ \ \ \\ \ \\ \ \ \ /\ \ \ \ \ / / / \ / / / .11 ' !i.i.i. \ I \ \ \ \ \\ \ \\ \\\ \\\ \ �/ \T�\ \\ �''`- / I I I I \ / / / I--- / /� / / /// // \ / / / //, \ \ \ \ \ I \ \ -_ - - ,,-'_-;,-e / / I..I i � � + { \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ / _. I I , r \ \ \ \ \ \ \ \\ \ \\ \ \\ \ ! / \ %\\ \ ` I \ / / / / / / / - - ---- - / / / / / / / / � \\\ / - / - / i. I , i \ I / / I \ \ \ \ \ \ \\ \ \ \ \ \.'.'.. \ \ � _. \ \ -- - / // / /rz / / / / r i I .I . i . l .. / / ...\ \\/ / \ l \ \ \ \ \ \\ \\ \ \ \ \ \ \ \ \ / / / \\ \ �\ ' I _ - f �/ / / / / / / / // / / / T� uj ... \ PROPOSED TR E / \ %� \ \\\ \\\\\\\\\\\\\ \ \ �: \ / \ / / / / �i / / / / �/ /�- -- / / / Z , / I i I 1 .I � / OPRO PROON FENCIN \ . / . . . \ \ \ \ \ \ .\\ \ \ \ \ .... s \ I I I -- / / -_ ,9 / / / / / / / / � / . 5 I / " \ / \ . \ \ \ ROPOtSE� 0 Q1VER ION \ / / \ \ \� -- �� / / � / / / X /� / / / I \ i L M \ \. (TYP.) . . . . . . . IP y \ . \ \ \ \ \ \ \ \ \ \ f \ .....'.. l - / / / % / / \ O 1. - � - I .I.1 .I .. .. oc / \ \ \ \\ \ \ \\ \\ \ \ / \ - J / � --,/ / / / / // � / - i. .L .. / \ . ... / \. 1 \ � \. \ \ \PRO \OS�D 7RtE / \\ \ \ \ \ \ - - - - - - �' / / / -_ / � / /// / / /// , / / / / I 1 I I It .l.. - i/ \ \ �/ % / /; / / \ \ \ \ \ \ \\ \ ROTECTION FENCING O \ / �' \ \ \ \, \ \ _ _ ' / / / / / "- - / / / / �/i / /i / .�--- �I 30' TEMPORARILY GRADING I i / \ / / / /... \ \ \ TYP.) I \ -- - - --- i / / / / / / / / 5 /. �' . \ \ \ \\ \ / \ / --- / i , / I �" EASEMENT FOR FUTURE "' I .I .I .I- I _1 /. \ , / \ / \ / \ �/ Q \ \ \ \\\\\\\\\v \ \ \\ i / / _ \ ` \ - - - - / / / �' / / � / -/ / // / / / , 1 -� W / CONSTRUCTION OF EASTERN I . _� - - t , , . .. / / . \ � � \ \ \ \ \ \\ \ \ \ / / 7- \q, \ \ � / / I-,' / // / / / / 1. ' / / L / c I.i. /.. / � \/ / /........�� /\ . \. .\ `\ \ \ \\ ' \ \� \ / 1 \ � - - / / / // 1 / 5 / 1 / / /./ / �', f- - AVENUE CONNECTOR TO BE - - _ \ \ \ \ \' \ / ce I I. / \ / / / / c .. \ \ \ / / �/ / / // /�,-- T VACATED WHEN EASTERN � .I 'i. I / / / ,. I \. \ \ \ \\ \ \ \ / \ \ � ____ _._ - -- / / ,% / / --/ /j // / /� , T / / !ii � �- , AVENUE IS CONSTRUCTED 1 I.I.I . j -;�/ / . / / IP - / l \ \ \ \\ \ \\ \\ \ \ \�\ \ /� / , s � \ \ � / __� / / // _ // / / / >\ D.B. 4077 PG. 175 I _ I / / \ \ \ \ \\ / 1 _ - / / 11 / / / / / ,/ / /// ' , ( I I r_ y , 1/ y _Z__ \� -. \ X \ \ \ �-��P`\6 \ \�\\ \ \ \` / \ \ \ \ ` f � / / / / -0 /, , � / / 1 1 / I 1 _- L -,�/1 / /, /� j f''/. /i` � / 1� �. i IP q _ \\ \\ \ �\}, \\\ \ \ _..'' 1 \ \ , \ - _ - i � /_. .1 , /�/ / / / ,// // ? -% �� / // '// / / _ \ // I �. _ I I i 1 / /� / /� _ \ \,, y \\ PH S �\ \\\\ \ \ \ / / \ \ \ / / / / / / / / / S / / / / - / /// / / /i/ / /� z _ -I 1 , � IP \ \ % \ \ \ \ \ / / T / / / / / / ___/ d / / / i o - ____1 // \ 046 �R S \\ \ \ / s \ / / 1 1/ / / // f' N PROPOSED TEE i - _L / /. _ \ - - - \ j �-�1. 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I \ - -- - - RUNOFF DIVERSIO i ( _F� _ _ _ INTO ST1 1 11 IP / / / / / - - _ �, _ _ _ / O / / _ \� / - - \ `' BASIN .i3 / / / \ \ - f - \ I I I 1 _ _ 2� CRES \ - - �� / __ / \ _ _ _ / / , / D(P / / :E ' 45 ,- 24" TEMP PIPE TO BASIN #3; � `_ _ - . . ! / / / _ / / / _ \ � \ - - - - - - - � � _t \ - / - \ �' I' L =140; s =o.86� ____� 4 OO�ACRES' / - % / /� // / / �, \ / `- �==L \, p - STS � IC 5-mi - - _ -- - % - - / / \ / ,- ,- �' _ \\ \ _ - - - / �- � ---._ __ � \ \ - / %� y / IN +V IN. 630; 7; INV OUT. 629 t- - - _� �_-_ C - _(y, , �-- , / % _ -� // /, / / \ \ \ - i _ _ , _ / , / - - - i \ \ \ - - - - \ \ \ iJ J __ __ Tc= i \ \ \ I / / /�I / �� Y \ ', ` / / / / ' ' / / \ \ ", N, --, �11_ ul __ \ I - .. I---- 11 - � � - - -- -...- . 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' .SEDIMENT TRAP •STONE WEAR -'...' i I I �I W WIRE BACKING TYP. i INSPECTOR APPROVES AN _ _ _ - , \ \ \ \ \ \ I t I. \. \\ \ _ / / / / / I I / ` !' ' �'� .'.' ..... . W =j. '-.. � =30 D =2 F \ \ _ _ \ \ I P 1 Dc \ \ ROP DSED 24 DIVERSION BERM' DD / / // / , 1 I �\_ - / / / i L . 1. .: .......'� �.'r'...,:.' .� / .. �' SIT IS, STABILIZED y5 - I \ \ \ h \ \ \ , // / / / / / \ I \ c / / - - / / y'.' ` PROPOSED SILT /FENCE F SI \ \ ` \ \ \ \ \ \ �, I \ \ \ \ \ \\ \ / , / 4 5 / / ` � _ // / / SS - / % \ \ / / / / \ -� �- t l / /` - .. -- 1WIRE BACKING (TYP.)Q // i �� / `., \ \\ \ \ \ J IP \/♦ \ \ \ \\ X69 / / / i I __ -- - -- - -_ ' _ -- 1 ' l / / / /. - / �' /' - / - '/ �'/ !/ - - \ \\ \\ \ \� \11 - - - - -- 5 \ \ - \ \ \ \� _ - // �/ ♦ / / 1 __- / , / .' 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II. \ � \ \ \ \ \ / / \ \ � - - (A \\\ \ \ \ , / . ! . \ \ / ! . / / I I I III I I L ...I . ....(.....I I \ . \.... \ \ \ \ � \ \ ) / \ \ Q \ _ \ \ \\ / ! /! /� \\ �n / ij ! / I I I I •I• j.':...I. \ . .\ '•. , \ \ \ 100 `STRE,A�I BUFFER \ \ \ I I I I I \ \\ \ /\ �- { '.�....'.'.'..'.'...r .' . - A, \.....'. \ \ \ � \ \ / / ) / / / �. ./. � / / /. I I I II I / lI \\ \ \ \ \ , \ \ \ )� / /. / .. /i 1I 1 1 I 1 I 1.'.'.'. /. I. \.. ' \ \ /' \ .J \ \\_� `i , / / / /� \ /. i i. . / II I ( I III I I I \ \.. \'...'.'.`.l.} . \. \'�\.: \\ \ \ \ \\ \\ // \ \ \ - J 0.. \ / / / . i ./. I I I I I I I I'.'.. ....'. \.\. }. '.•\ � ,..\. \ \ \ _ , \ \ \ t-I \\ / !.� ! � ` IP -y . .y. / I I I'I I I I I I I� ,.. \' \ \ \ \ \ / \ \ _ � _j _�_ ... . ./ . .! . \. \ / 'I I I \ \ '\ \ \ � N � - -' y / . / / / / .. �P __ I I I I I I I .PROP'OS � V�OT E -1 \ l - / / r \ �/\ \ \ - W 0 �� I I . ! .1 j /' , -, -- -_ / / f I , , I WITH EC -1 CLASS 11 RIRRAP , \ \ / \ \ \ - - - - - - - - - W /. I 1 W1 =4.5' .W2= 18.5' L =1 T' D =3.6' \ \ - -� �` \ ry \ j .j. t �. !. / Ps \ TI,_ 1P� - %1 / I I I ' I I I I ,...i..,...\ ....'\. \ ' ` \ \\ `\ �� \ \\ \ \�--- - - - - -- \---- _ -- ~ \\ ` -, �/ !. / / , _ / / / �� I I I , I f' I I I I' ..'I'.i.'.'..I }{ \��..... \ \ \\ \\ '- �� \ 580 --- - i- _ �-- \ - -- _/ !. !. ! ! _ - ___. / ( r I I I I I ' '...L : /'' .\..�... \ \ � _- / \\ \ - _ _,,__ -_ O /� z 1. ! - - / ! I I \ }' \ \ f \ {jam SELECTIVE CLEARING AS NECCESSARY TO BE ALLOWED- / / t .� - / I I f I �' '•'�'•'•'•I• \' l' ' \ \ � / \ \ z ct 0 (i) BETWEEN TREE PROTECTION & LIMITS OF DISTURBANCE; , - - _ ! / ! / -\ _ - \ / ) l I I I I I U . L . . , . \ \ \ \ - _ \ _ _ _ _ _ _ __ _ _ _ _ _ _ _ r , //7 , _ \ / i I ' I , I I I.'.'!':'::.:'. .' . ..'. \� .... \ \ \ A --' Q _ _ _ - / / 1 / , / / / ! / / / � )... i.....'; . J� - 1.. I' .. . \' \ \ _ _ _ ' - - w I \ ` �/ ! ! ,. / -_ ~' a / / .J...•.L' I': .......L. '�'. }''. \' ::. \ �- C \ __ __- - _ cc \ ___ '/ / j , /r r / / /' / , .1.'.. I ... .I.... \\ \- \.'.. \\ - - -_ W G N \ �- / l i. l /. / I. \ , - l t .t 1...1..... }.'. \. \ .:� - - - W // ' 1 . . ! , / . // ' ' \ .. \. / ._�.. .y 4 ' � , .\ . \ .� .. � , ` - _ I -_ O -- -- , i / V Q _ _ i PROPOSED LIM_rTS i SEDIMENT BASIN SB -1 SCALE: 1 "=20' S E�D/l ME /N/ T B/A IS I/ I P HA S /' I I \ 5.1 6 ///A CR E IS t o / C V/V 0/6 Tc// / l / // / / // / // / i Z, // f / i • PROPOSED BAFFLE / ! LO / / / / /' / A / V) - / l� 0" RCP RISER � ♦ / ♦ / / / / / / / TOP OF RISER - 556.5 1Z, 7W lk 24" RCP CLili BARREL / � // /// / /,♦ 46.7LFQa 0.50% INV IN. 55o.2o S INV OUT. 549.96 / SSF < s / s MH s. SF /� ♦ S _. �_ � -MH -$ / 100 - -- / ssF ♦ - / l- . / F* ss� T WIDE EARTHEN EMERGENCY /s s♦� _,___-OUTFALL SPILLWAY; ELEV. 557'50 SSF /� ♦ ♦ PROPOSED EC 1 CLASS As ,1 /,�♦ 'RIPRAP OUTLET PROTECTION �sio • s�� / --_'W1=7-5'; W2= 18.5'; L =5o'; D =1.4' s5F:♦ S S� //f EXTEND RIPRAP TO STREAM BANK / l Sediment Basin #1 Design drainage area (acres) basin volumes: (using 2' contour intervals) elevation (ft) contour area (sf) 552.00 6374.0 554.00 7980.0 556.•00 9687.0 556.50 11494.0 559.25 12675.0 wet storage: wet storage required (cy) (67 *DA) dewatering orifice elevation (ft) wet storage provided at this elevation (cy) available volume before cieanout (cy) (min. 34 *DA) cieanout elevation (ft) distance from cieanout to orifice (ft) (> 1') dry storage: dry storage required (cy) (67 *DA) principle spillway crest (ft) dry storage provided at this elevation (cy) diameter of dewatering orifice (in) diameter of fle)abie tubing (in) (orifice +2 ") runoff: C (use 0.45 for bare earth) tc (min) 1 2yr 4.0 Q 2yr 1 25yr 5.8 Q 25yr principle spillway: available head (ft) diameter riser (in) spillway capacity, Qp (cfs) diameter trash rack (in) barrel length (ft) head on barrel through embankment (ft) diameter of barrel (in) 345.7 design high water (ft) MIN. 1' Wl SPILLWAY CREST OF EMERGENCY 554.00 top of dam (ft) V WITHOUT SPILLWAY 5.16 top width of dam (ft) 10.0 175.4 DESIGN HIGH WATER 552.00 552.66 {25-YR. STORM ELEV.) 63'x171' volume (cy) o . 2:1 0 wlnM'1.0 _. - - - - - -- -- . ------- 530.5 `:. RISER CREST 556.50 DRY. STORAGE DEWATERMNG 1183.8 effective width, We (ft) DEVICE 1379.7 ' wET y sroRAGE ................:.:.. 1.04 2610.1 WET STORAGE V VAX {,) $EI2MENT CLMOLIT POINT YES wet storage: i STORAGE REDUCED 4.50 0.5 TO 34 2:1 345.7 design high water (ft) 557.50 554.00 top of dam (ft) 559.25 530.5 top width of dam (ft) 10.0 175.4 bottom of basin (ft) 552.00 552.66 approx bottom dimensions: 63'x171' 1.34 upstream face slope: 2:1 24 downstream face slope: 3:1 345.7 baffles: YES 556.50 length of flow, L (ft) 105 702.3 effective width, We (ft) 101 4.0 L I We (baffles not required if > 2) 1.04 6.0 WET STORAGE V VAX {,) collars: YES wet storage: depth of water at spillway crest (ft) 4.50 0.5 slope of upstream face (Z-1) 2:1 11 slope of barrel (Sb) 0.50% 10.32 length of barrel in saturated zone (Ls) 27.56 16.46 number collars required 2 COARSE AGGREGATE" CLASS I RMSRA# dimension of collars 3.4' x 3.4' 1.00 emergency spiBwav: YES 30 required capacity (Q25 -Qp) (cfs) 0.0 24.00 bottom width (ft) 7 42 slope of east channel (ft/ft) 4% 46.7 minimum length of exit channel (ft) 18 7.54 crest of spillway (ft) 557.50 24 570.00 3036.0 Sediment Basin #2 Design design high water (ft) 574.00 570.88 drainage area (acres) 576.00 4'59 DESIGN HIGH WATER basin volumes: (using 2' contour intervals) 156.1 bottom of basin (ft) (25 -MR STORM ELEV•) elevation (ft) contour area (sf) volume (cy) 52x72' 568.00 2247.0 0 SIN 10 570.00 3036.0 194.9 baffles: 572.00 3927.0 452.1 , srarrAGE 574.00 4918.0 779.0 WET • STORAGE 576.00 6010.0 1183.1 WET STORAGE V VAX {,) collars: - NT CLEAHfitfT POINT WCED 34 wet storage: depth of water at spillway crest (ft) 5.00 TO CSTIO/RACER wet storage required (cy) (67 *DA) dewatering orifice elevation (ft) wet storage provided at this elevation (cy) available volume before cleanout (cy) (min. 34 *DA) cloanout elevation (ft) distance from cieanout to orifice (ft) (> 1') dry storage: dry storage required (cy) (67 *DA) principle spillway crest (ft) dry storage provided at this elevation (cy) diameter of dewatering orifice (in) diameter of fle)able tubing (in) (orifice +2 ") runoff: C (use 0.45 for bare earth) tc (min) 1 2yr 4.0 Q 2yr I25yr 5.8 Q 25yr principle spillway: available head (ft) diameter riser (in) spillway capacity, Qp (cfs) diameter trash rack (in) barrel length (ft) head on barrel through embankment (ft) diameter of barrel in MINN, 1 W1 SPILLWAY 2' WITHOUT r CREST OF EMERGENCY s SPILLWAY :•:7 -- RISER CREST OEI 307.5 design high water (ft) 574.00 570.88 top of dam (ft) 576.00 307.5 top width of dam (ft) 10.0 156.1 bottom of basin (ft) 568.00 569.60 approx bottom dimensions: 52x72' 1.28 upstream face slope: 2:1 18 downstream face slope: 3:1 307.5 baffles: YES 573.00 length of flow, L (ft) 70 308.1 effective width, We (ft) 63 4.0 L / We (baffles not required if > 2) 1.11 6.0 WET STORAGE V VAX {,) collars: YES wet storage: depth of water at spillway crest (ft) 5.00 0.4 slope of upstream face (Z:1) 2:1 11 slope of barrel (Sb) 1.43% 7.34 length of barrel in saturated zone (Ls) 31.82 11.71 number collars required 2 COARSE AGGREGATE" CLASS I RMSRA# dimension of collars 3.6'x3.6' 1.00 emergency spillway: NO 24 required capacity (Q25 -Qp) (cfs) WA 15.00 bottom width (ft) NIA 36 slope of exist channel (ft/ft) N/A 70.00 minimum length of e)dt channel (ft) N/A 7.00 crest of spillway (ft) N/A 18 downstream face slope: 1176.1 SEDIMENT BASIN Su"-1 EXISTING GROUND NTS - 10 i-- TOP OF DAM ELEV. =559.25'1 1 25 YR. STORM 1.0' MIN. � r - - ELEV. =_557.5' _ i; Ili;- 1.0' MIN. \! ice, i 1- Rt_SPR T17P F/ FV =.5.5R_ .5 . _ Sediment Basin #3 Design design high water (ft) drainage area (acres) DESIGN HIGH WATER basin volumes: (using 2' contour intervals) {25_YR. STORM ELEV.) elevation (ft) contour area (sf) 623.00 1226.0 624.00 1656.0 626.00 2640.0 628.00 3729.0 630.00 4919.0 632.00 6209.0 wet storage: wet storage required (cy) (67 *DA) dewatering orifice elevation (ft) wet storage provided at this elevation (cy) available volume before cieanout (cy) (min. 34 *DA) cieanout elevation (ft) distance from cieanout to orifice (ft) (> 1') dry storage: dry storage required (cy) (67 *DA) principle spillway crest (ft) dry storage provided at this elevation (cy) diameter of dewatering orifice (in) diameter of fie)able tubing (in) (orifice +2 ") runoff: C (use 0.45 for bare earth) jtc (min) i 2yr 4.5 Q 2yr 1 25yr 6.5 Q 25yr principle spillway: available head (ft) diameter riser (in) spillway capacity, Qp (cfs) diameter trash rack (in) barrel length (ft) head on barrel through embankment (ft) diameter of barrel (in) MIN.1' Wt SPILLWAY 2' WITHOUT 4.5 design high water (ft) 630.00 DESIGN HIGH WATER top of dam (ft) {25_YR. STORM ELEV.) volume (cy) Os 0 153.0 53.2 f 625.27 DRY DRY ` STORAGE 210.9 - 445.6 ` wET - sTORAGE 764.9 downstream face slope: 1176.1 301.5 baffles. sMWEW cLElUIOUT POINT {' WET " STORAGE REDUCED 629.00 TO 34 C.Y. / ACRE) CREST OF EMERGENCY r SPILLWAY RISER CREST aC'EaaNc 301.5 design high water (ft) 630.00 626.77 top of dam (ft) 632.00 301.5 top width of dam (ft) 10.0 153.0 bottom of basin (ft) 623.00 625.27 approx bottom dimensions: 26'x81' 1.50 upstream face slope: 2:1 18 downstream face slope: 3:1 301.5 baffles. YES 629.00 length of flow, L (ft) 55 303.8 effective width, We (ft) 78.6 4.0 L I We (baffles not required if > 2) 0.70 6.0 WET STORAGE V VAX {,) collars: YES wet storage: depth of water at spillway crest (ft) 6.00 0.5 slope of upstream face (Z 1) 2:1 8 slope of barrel (Sb) 1.0% 10.13 length of barrel in saturated zone (Ls) 37.53 16.09 number collars required 2 COARSE AGGREGATE" CLASS I RMSRA# dimension of collars 3.9'x3.9' 1.00 emergency spillway: NO 30 required capacity (Q25 -Qp) (cfs) NIA 24.00 bottom width (ft) NIA 42 slope of exist channel (ft/ft) NIA 49 minimum length of e)at channel (ft) WA 7.50 crest of spillway (ft) NIA 18 r 618.00 1759.0 ELEV. _j MIN. 30 COMPACTED SOIL OR AGGREGA TE OVER BOTTOM OF BASIN BASE PLATE 8'x8'x1 4" THICK GALV C AY CORED DAM ELEV. = 623.00 KEYED INTO THE STEEL BASE PL TE EXISTING GROUND IN V. IN = 623.00' 18" CMP BARREL (2) 3.9' X 3.9' GAL V. STEEL LENGTH =49' ANTI -SEEP COLLARS SLOPE =1.0% 6" TOPSOIL EMBANKMENT HEIGHT 10.00' 42" DIA. 15" HIGH 16 GA. GAL V. STEEL ANTI - VORTEX DEVICE -30" DIA. RCP RISER 1' SCARIFIED KEY FOR 6" DIA. DEWATERING� SOIL COHESION DEVICE- TUBING :` �� INV. OUT = 549.96' - UPSTREAM TOE OF DAM �j�j '� n EXISTING GROUND FLFV r d�I MIN. 30" COMPACTED SOIL OR AGGREGA TE 0 VER BOTTOM OF BASIN BASE PLATE ELEV. = 552.00 8x8 x1/4" THICK GAL V. C AY CORED DAM NOTE: EMERGENCY STEEL BASE PLATE KEYED INTO THE SPILLWAY INCLUDED EXISTING GROUND AT ELEV. 557.50 INV. IN = 550.20' 24 RCP CL.I11 PIPE (2) 3.6' X 3.6' GAL V. STEEL LENGTH =46.7' ANTI -SEEP COLLARS SLOPE =0.50% SEDIMENT BASIN SB -2: CONVERTED TO ST-7 IN ESC PHASE II, SEE SHEET 33 SCALE: 1 " =20' MIN. 30" COMPACTED SOIL OR AGGREGATE OVER BOTTOM OF BASIN BASE PLATE ELEV. = 568.00 8x8 x1/4" THICK GAL V. C AY CORED DAM STEEL BASE PLATE KEYED INTO THE EXISTING GROUND INV. IN = 568.00' 18" CMP PIPE (2) 3.6' X 3.6' GALV. STEEL LENGTH =70' ANTI -SEEP COLLARS SLOPE =1.43% i / / / r / I f I l I I i l � I +' PROPOSED BAFFLI / / \ \ \ / \ 24" CMP RISER TOP OF RISER - 573.00 TOP OF DAM - 576.00 *ft".. SSFSSF - -S SSF - SSF SSF SF SSF "" �1♦ �� • ` rssF..�.s F :. - 18" CMP BARREL f r�� I �\ 7oLF@a 1.43% t 1 INV IN. 568.00 _INV OUT. 567.00 I PROPOSED EC -1 CLASS Al RIPRAP OUTLET PROTECTION ► _ / ' W1=4-5";W2=12.5'; L =11'; D =14 fA SEDIMENT BASIN SB -3 SCALE: 1 "=20' f 1 \ / b a b b I ♦ � I \ \ \ '\ b b b b b b I ♦ / \ � \ \ \ ,♦ / F SS -30" CMP RISER ELEV 629.00' / I 1 \ SSF 18 CMP BARREL i L -491 S= 1.0D/o INV IN. 623.0; INV OUT. 622.5 2�/ -6,30 _ / / PROPOSED BAFFL i SEDIMENT TRAP ST -1 SCALE: 1 " =20' 1 \ AGGREGATE WEIR OUTFALL _ n -CLASS Al RIPRAP OUTFALL 'a / 0 ,SSF / / / SSF q 4 SSF / / / r / T�F��,O`' / / / CLASS AI RIPRAP OUTFALL W =6'f L =5', D =2' r / / r / / i Sediment Trap 1 design 112072 0 W SCALE ° drainage ainage area (acres) ( <3) 2 53 N/A0 ' vARrnaLE trap volumes: s= ORaWL CREST 01: STONE WEIR Y• elevation (ft) area (sf)' volume(cy) GROUND 1 616.00 963.0 0.0 r 618.00 1759.0 99.3 DRY STORAGE vARMr 620.00 2667.0: 262.1. to Z 0 to I- Z 0 621.00 3161.0 369.9• ~ Z 0 U a LLt Ln co cn o 0 � 622.00 3682.0 _ _. 496.5 WET STORAGE V VAX {,) t«cAVArELr) FILTER CLOTH CIMNAL OWUND wet storage: FLT" CLOTH OMMMNA wet storage required (cy) (67 *DA) 169.5 -SEE PLATE 3.13 -1 COARSE AGGREGATE" CIAS$ I RIPRAP bottom of stone weir (ft) 619.0 wet storage provided at this elevation (cy) 172.5 *SEE PLATE 3.13 -1. COARSE AGGREGATE" CLASS I RMSRA# slope of wet storage sides _ 2:1 C wet storage provided at this elevation (cy) 65.4 „weir length (ft) (9)DA) 22.8 dry storage: 2:1 bottom of trap elevation (ft) 617 dry storage required (cy) (67 *DA) 169.5 bottom trap dimensions: 81'x 12' crest of stone weir 621.0 top of dam elevation (ft) 622 dry storage provided at this elevation (cy) 197.8 top width of dam (ft) 3 slope of dry storage sides 2 :1 top trap dimensions 105' x36' SEDIMENT TRAP ST-2 SCALE: 1 " =20' AGGREGATE WEIR OUTFALL r- - W= io.o', L= 15.1', D =2.0' _ SSF •l SSF 26 - �- A \ 36 CLASS AI RIPRAP OUTFALiL .:.. -/ W =6', L =5', D =2' \\ Sediment Trap 2 design 112072 0 W SCALE ° drainage area (acres),( <3) 0.97 N/A0 1^ VARMA&f* trap volumes: s= OMINI CREST OF STONE WEIR Y• elevation {ft) area (sf) volume(cy) E NO 623.00 1456.0 ._ 0 0. _._ 624.00. 1757.0 59.4 DRY STORAGE � y VA RVV�F" 625.00 2084.0 130.5 to Z 0 to I- Z 0 626.00 2435.0 214.1 ~ Z 0 U a LLt Ln co cn o 0 � W 2: cc > 0 U oc D > WET STORAGE t«cAVArELr) > FLT" CLOTH OMMMNA ELEV. wet storage: wet storage required (cy) (67 *DA) 65.0 *SEE PLATE 3.13 -1. COARSE AGGREGATE" CLASS I RMSRA# bottom of stone weir (ft) 624.1 C wet storage provided at this elevation (cy) 65.4 slope of wet storage sides 2:1 weir length (ft) (9xDA) 8.7 dry storage: bottom of trap elevation (ft) 623 dry storage required (cy) (67 *DA) 65.0 bottom trap dimensions 55' x 30' crest of stone weir 625.0 top of dam elevation (ft) _ _. . 626 dry storage provided at this elevation (cy) 65.1 top width of dam (ft) 2 slope of dry storage sides 2:1 top trap dimensions 67' x 42' H 0 0 SCOTT R. COLLINS 1L. No. 35791 Z 0 o- a U In LU Z 0 w Z" 0 O H W OG M M M M M M u,1 q a ` Ls iz O r � � 8 cV LA T� OO Ch I i� M M ® N d' d' C Z c I 7 L c N 0 WL N � Q a Q C Q D r > < V LL] J - _j oC Q J v U C C c U) W L L9 H Lo O r O Ii Z 3 ry 0 U0 U U - j 0 o L W � W 2 o UlH `� J > _ o t5 E U5 w w Z FY- 06 w w Zz ry O z w W Z O U W o J W rwy' L W 0 Q o L O U 0 x LU v LU b w LU a U $ JOB NO. 112072 0 W SCALE ° N/A0 s= SHEET NO. a In 34 °' � Z Z 0 a E- o < a w X U O M ` ;67 0 to Z 0 to I- Z 0 U o Z 0 ll� ,N. < 1-' Z ~ Z 0 U a LLt Ln co cn o 0 � W 2: cc > 0 U oc D > 0 U � > Ln > C M M M M M M u,1 q a ` Ls iz O r � � 8 cV LA T� OO Ch I i� M M ® N d' d' C Z c I 7 L c N 0 WL N � Q a Q C Q D r > < V LL] J - _j oC Q J v U C C c U) W L L9 H Lo O r O Ii Z 3 ry 0 U0 U U - j 0 o L W � W 2 o UlH `� J > _ o t5 E U5 w w Z FY- 06 w w Zz ry O z w W Z O U W o J W rwy' L W 0 Q o L O U 0 x LU v LU b w LU a U $ JOB NO. z Ir w w Z c-D Z W Mn Z J U 0 C O U c Iu -N 'L 3 Q) Q) L. a x 0 0 3 C) 0 0 U C0 0 U 0 c ie O Z U 0 U 0 E 0 C 6 U C > Q) 0 0 s z 112072 0 W SCALE ° N/A0 s= SHEET NO. a In 34 °' z Ir w w Z c-D Z W Mn Z J U 0 C O U c Iu -N 'L 3 Q) Q) L. a x 0 0 3 C) 0 0 U C0 0 U 0 c ie O Z U 0 U 0 E 0 C 6 U C > Q) 0 0 s z SEDIMENT TRAP ST -3 SCALE: 1 " =20' SLIP _ / / / - "-- -- - F- 4P __ ---- - - - - -- /i - -- GGREGATE WEIR OUTFALL - �� W =22', L =1 D =3..8' 11111010 �'ss A It o SSF F..�`SSF.. � : _ -CLASS AI RIPRAP OUTFALL I % - - W =6', L =5', D =2' CLASS AI RIPRAP OUTFACE W =6', L =5', D =2' ��► S F/ - " 63 / Sediment Trap 3 design 32.2 bottom of stone weir (ft) drainage area (acres) ( <3) drainage area (acres) ( <3) 1.60 trap volumes: trap volumes: elevation (ft) oft cREsT -0F STONEYYEI1 volume(cy) 630.00 elevation (ft) area (sf) volume(cy) amr 1669.0 98.9 620.00 469.0 0.0 167.3 To 622.00 1033.0 54.3 DRY STORAGE 622.00 2010.0 624.00 1697.0 154.4 VAIMU. 624.00 3088.0 625.00 2067.0 224.0 WET STORAGE 625.00 3687.0 626.00 2462.0 307.7 EM.TM CW M �� OU 626.00 4331.0 526.3 WET STORAGE t � "'r ML wet storage: .SM PLATE ars-I, COMM AaMWc• cuss r Rprt�P wet storage required (cy) (67 *DA) 107.2 Ce a-1 bottom of stone weir (ft) 623.2 Ln wet storage provided at this elevation (cy) 108.6 .SM PLATE Mf3 -,: CORM AGC iE~ CLASS I RMP slope of wet storage sides 2:1 wet storage provided at this elevation (cy) 189.0 weir length (ft) (9)dDA) 14.4 dry storage: 2:1 bottom of trap elevation (ft) 620 dry storage required (cy) (67 *DA) 107.2 bottom trap dimensions: 57' x 8' crest of stone weir 625.0 top of dam elevation (ft) 626 dry storage provided at this elevation (cy) 115.4 top width of dam (ft) 2 slope of dry storage sides 2:1 top trap dimensions 81'x32' PLUNGE POOL FOR CULVERT CONNECTOR ROAD STA 13+80 1.00' 14.00' 613.00' 612.00' 1.00' 0 0 0 0 0 0 0 0 0 0 0 0 0 0 EXISTING 2.50' GROUND 2.50' 2.0' 10.0' 5' WIDTH =B' T EC 1 CLASS 1 RIPRAP DESIGN VALUES 0=6.39 cfs, DE =o.54 ft, D5o /DE =.45, DSo= .24 ft, FR= o.86, hs /DE =1, hs =.54 ft, hs /D50=2.22 TAILWATER CHECK TW =.16, tw /DE =.11, LOW TW BASIN DIMENSIONS POOL LENGTH GREATER THAN 5.4 ft (10 ft PROVIDED) BASIN LENGTH GREATER THAN 8.1 ft (15 ft PROVIDED) APPROACH THICKNESS= 0.75 ft (2.5 ft PROVIDED) BASIN THICKNESS =0.49 ft (2.5 ft PROVIDED) PLUNGE POOL FOR STORM PIPE 65 1.00' 11.00' 610.00' 1 609.007 /-1.00' v^► v+ v� v� v��v�� 2.50' 2.0' 8.5' 6' WIDTH =8' VDOT EC 1 CLASS 1 RIPRAP DESIGN VALUES Q =2o.8 cfs, DE =1.65 ft, D5o /DE =.25, D50= .41 ft, FR =1.00, hs /DE =o.5, hs =.825 ft, hs /D50=2.01 TAILWATER CHECK TW =.4, tw /DE =.24, LOW TW BASIN DIMENSIONS POOL LENGTH GREATER THAN 8.3 ft (8.5 ft PROVIDED) BASIN LENGTH GREATER THAN 12.4 ft (12.5 ft PROVIDED) APPROACH THICKNESS= 1.23ft (2.5 ft PROVIDED) BASIN THICKNESS =o.82 ft (2.5 ft PROVIDED) CLASS At RIPRAP OUTFALL W =6', L =5', D =2' SEDIMENT TRAP ST-4 SCALE: 1 "--20' Sediment Trap 4 design 32.2 bottom of stone weir (ft) drainage area (acres) ( <3) drainage area (acres) (<3) 1.00 trap volumes: 2:1 dry storage: elevation (ft) area (sf) volume(cy) 630.00 1028.0 0.0 632.00 1669.0 98.9 633.00 2027.0 167.3 634.00 2411.0 249.4 wet storage: wet storage required (cy) (67 *DA) 67.0 bottom of stone weir (ft) 631.5 wet storage provided at this elevation (cy) 69.8 slope of wet storage sides 2:1 dry storage: dry storage required (cy) (67 *DA) 67.0 crest of stone weir 633.0 dry storage provided at this elevation (cy) 97.5 slope of dry storage sides 2:1 PLUNGE POOL FOR CULVERT CONNECTOR ROAD STA 16 -f- 75 1.00' 14.00' 613.00' 611.00' 2.00' 0 0 0 0 0 0 0 EXIS TING 2.50' GROUND 2.50' 2.0 16.0' 8' WIDTH =8' VDOT EC 1 CLASS 1 RIPRAP DESIGN VALUES Q =28.56 cfs, DE =o.87 ft, D5o /DE =.45, D5o= •39 ft, FR= 2.99, hs /DE =1.8, hs =1.56 ft, hs /D50=4.00 TAILWATER CHECK TW =.36, tw /DE =.41, LOW TW BASIN DIMENSIONS POOL LENGTH GREATER THAN 15.6 ft (16 ft PROVIDED) BASIN LENGTH GREATER THAN 23.4 ft (24 ft PROVIDED) APPROACH THICKNESS= 1.17ft (2.5 ft PROVIDED) BASIN THICKNESS =o.78 ft (2.5 ft PROVIDED) PLUNGE POOL FOR STORM PIPE F5 7 1.00' 12.00' 611.00' 610.00' 1.00' O o O o o O 0 o v o 0 0 0 EXISTING 2.50' GROUND 2.50' WIDTH =8' VDOT EC 1 CLASS 1 RIPRAP DESIGN VALUES Q =3.0 cfs, DE =o.34 ft, D5o /DE =.45, D5o= .15 ft, FR= 3.00, hs /DE =2.0, hs =.3 ft, hs /D50=2.00 TAILWATER CHECK TW =.13, tw /DE =.38, LOW TW BASIN DIMENSIONS POOL LENGTH GREATER THAN 3.8 ft (8.o ft PROVIDED) BASIN LENGTH GREATER THAN 5.0 ft (14.0 ft PROVIDED) APPROACH THICKNESS= 0.45 ft (2.5 ft PROVIDED) BASIN THICKNESS =0.30 ft (2.5 ft PROVIDED) weir length (ft) (90A) bottom of trap elevation (ft) bottom trap dimensions: top of dam elevation (ft) top width of dam (ft) top trap dimensions FLTER CLOTH 0MONAL GROUND nor COARSE. AOCREQATE~ CLASS T. RIPRAP 9.0 630 64'x 17' 63� 80'x33' PLUNGE POOL FOR STORM PIPE 43 1.00' 14.00' 613.00' 611.00' 2.00' 0 0 0 0 0 0 0 0 0 0 0 0 0 0 EXISTING 2.50' GROUND 2.50' WIDTH =8' VDOT EC 1 CLASS 1 RIPRAP DESIGN VALUES Q =1g.o cfs, DE =1.00 ft, D5o /DE =.45, D5o= •45 ft, FR= 2.6o, hs /DE =1.8, hs =1.8 ft, hs /D50=4.00 TAILWATER CHECK TW =.38, tw /DE =.38, LOW TW BASIN DIMENSIONS POOL LENGTH GREATER THAN 18.o ft (18 ft PROVIDED) BASIN LENGTH GREATER THAN 27 ft (28 ft PROVIDED) APPROACH THICKNESS =1.35 ft (2.5 ft PROVIDED) BASIN THICKNESS =o.go ft (2.5 ft PROVIDED) CLASS At RIPRAP OUTFALL W =6', L =5', D =2' SEDIMENT TRAP ST-5 SCALE: 1 " =20' I / I _____.630 I I I /I / I / / / / SSF - SSF'�� / SSF � SC,F ss�� AGGREGATE WEIR OUTFAL W =3.5', L= 25.1', D =2.0' / / issue n I ( ( ( I ( r ( r ( CLASS At RIPRAP OUTFALL W =6', L =5', D =2' i / �.6 g5F Sediment Trap 5 design 32.2 bottom of stone weir (ft) drainage area (acres) ( <3) drainage area (acres) (<3) 2.79 trap volumes: 2:1 dry storage: elevation (ft) trap volumes: volume(cy) „ CREST OF STONEWEAR vARU9lE� 0.0 elevation (ft) area (sf) volume(cy) 36.6 615.00 896.0 621.00 1528.0 0.0 1136.0 T� 622.00 2010.0 65.3 DRYSSTOAAGE VAIMU. 624.00 3088.0 252.7 w z U 0 M \ o z O 625.00 3687.0 378.0 ~ m N J Z 626.00 4331.0 526.3 WET STORAGE t � "'r ML z 0 U a > ALTER CLOTH, GFOUND M Ce Ce a-1 wet storage: Ln wet storage required (cy) (67 *DA) 186.9 .SM PLATE Mf3 -,: CORM AGC iE~ CLASS I RMP bottom of stone weir (ft) 623.4 wet storage provided at this elevation (cy) 189.0 slope of wet storage sides 2:1 weir length (ft) (9)0A) 25.1 dry storage: bottom of trap elevation (ft) 621 dry storage required (cy) (67 *DA) 186.9 bottom trap dimensions: 91'x 15' crest of stone weir 625.0 top of dam elevation (ft) 626 dry storage provided at this elevation (cy) 189.0 top width of dam (ft) 2 ,slope of dry storage sides 2:1 top trap dimensions 116'x35' SEDIMENT TRAP ST-6 SCALE: 1 " =20' \ \ \ \0\<\\4 C'VV_ \ j \ \\ tI C DD ST6 24 / i 1 Sediment Trap 6 design 32.2 bottom of stone weir (ft) drainage area (acres) ( <3) wet storage provided at this elevation (cy) 0.48 trap volumes: 2:1 dry storage: elevation (ft) area (sf) volume(cy) 612.00 328.0 0.0 614.00 682.3 36.6 615.00 896.0 65.8 616.00 1136.0 103.3 wet storage: wet storage required (cy) (67 *DA) 32.2 bottom of stone weir (ft) 613.9 wet storage provided at this elevation (cy) 32.5 slope of wet storage sides 2:1 dry storage: dry storage required (cy) (67 *DA) 32.2 crest of stone weir 615.0 dry storage provided at this elevation (cy) 33.3 slope of dry storage sides 2:1 / / / SS _i SSF S3 / / / ORY, STORAGE WET STORAGE +SEE PLATV&13 -t: weir length (ft) (9)dDA) bottom of trap elevation (ft) bottom trap dimensions: top of dam elevation (ft) top width of dam (ft) top trap dimensions AGGREGATE WEIR OUTFALL W= 16.o', L =4.3', D =2.1' CLASS At RIPRAP OUTFALL W =6', L =5', D =2' ."k WL \ * t ORMNAL fILTEff CLOiM D".. COARSE Ai MA " CLASS S RPRAP 4.3 612 24' x 14' 616 4 40'x 30' TH 0 0 SCOTT R. COLLINS Z/ CD U No. 35791 1 1�0AS'SIIONAL E�Cs z U w 0 z O M w U) Zw a O H N W ce M M M M M M w ` i o o -I M N 0 fN - rq -_ -_ -_ N Cry N M M 1-4 L9E3) r M M d7 �,® N M U) Z Z N O N Li Q N J Uj � Q U u.i 0 J J Q ..N.o � LU J W V/ O L9 ry Oi N CL Z Q 0 _ U U P E- Z W W U L W � H Q W U) ZI- (n c W LU rwr' O U) J� O W cl� W ry a O ul N J w 0 w ITJ Ln JOB NO. 112072 SCALE N/A SHEET NO. 35 0 Q. L a a c a L 0 a o6 �z o� �W W Z = Z aW oZ a� J 0 L U 0 Q) O 3 � C O U U � � 3 V N y L � a x �v o� O o � 3 � O r Y il il N o v U n J N J � D O � U L O y a L) O x = y U y �M C y O U V O y-0 �E y � n> C V 2 O O y U) ll a - L = 3 F_ Ln F_ � z a¢ o w z U 0 M \ o z O (n z z 0 C!i z z E 0 U U Ln U.J o Z O= w ~ m N J Z 0 0 > z O U w CL M � > (n z N & CL 0 O z , a > }U F- z 0 U a > z 0 U a > OLU M Ce Ce a-1 Ln w ce Of M M M M M M w ` i o o -I M N 0 fN - rq -_ -_ -_ N Cry N M M 1-4 L9E3) r M M d7 �,® N M U) Z Z N O N Li Q N J Uj � Q U u.i 0 J J Q ..N.o � LU J W V/ O L9 ry Oi N CL Z Q 0 _ U U P E- Z W W U L W � H Q W U) ZI- (n c W LU rwr' O U) J� O W cl� W ry a O ul N J w 0 w ITJ Ln JOB NO. 112072 SCALE N/A SHEET NO. 35 0 Q. 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LEGEND: EXISTING STREAM BUFFER IMPACTED WITH THIS PLAN = 2.44 ACRES REQ'D MITIGATION = 2X IMPACT (4.88 ACRES) MITIGATION AREA PROPOSED WITH THIS PLAN = 4.93 ACRES PLANTINGS REQUIRED FOR MITIGATION AREAS: HARDWOOD AND /OR PINE SEEDLINGS = 4.93 X 600 = 2958 NOTES: 1. SEEDLINGS SHALL BE PLANTED AT 8'x8' ON- CENTER WITH TREE TUBES AND MATS IN ACCORDANCE WITH THE CHESAPEAKE BAY LOCAL ASSISTANCE DEPARTMENT RIPARIAN BUFFERS MODIFICATION AND MITIGATION GUIDANCE MANUAL, 2. IT IS A GOAL OF ALBEMARLE COUNTY THAT A MINIMUM OF 85% OF THE TOTAL PLANTINGS REQUIRED FOR BUFFER MITIGATION BE NATIVE PLANS FROM THE COUNTY PLANT DATABASE. 3. MITIGATION AREAS TO BE INCORPORATED INTO EASEMENTS. PLANTING NOTES: 1. THE PLANTINGS SHALL FOLLOW THE STREAM BUFFER MITIGATION PLAN. 2. THE FINAL PLANT LAYOUT SHOULD RESEMBLE A RANDOM AND NATURAL PLACEMENT OF PLANTS RATHER THAN A STANDARD LANDSCAPED APPROACH WITH TREES IN ROWS OR ANY OTHER ORDERLY FASHION. 3. THE CONTRACTOR SHALL WARRANTY THAT A MINIMUM OF 85% OF ALL PLANTINGS SHALL SURVIVE FOR A PERIOD OF ONE YEAR FOLLOWING PLANTING COMPLETION. 4. THE CONTRACTOR SHALL FURNISH NURSERY GROWN PLANTS CONFORMING TO ANSI Z60.1, WITH HEALTHY ROOT SYSTEMS DEVELOPED BY TRANSPLANTING OR ROOT PRUNING. TREES AND SHRUBS SHALL BE WELL SHAPED, FULLY BRANCHED, HEALTHY, VIGOROUS STOCK FREE FROM DISEASE, INSECTS, LARVAE, AND DEFECTS SUCH AS KNOTS, SUN SCALD, INJURIES, ABRASIONS AND DISFIGUREMENTS. 5. NURSERY GROWN STOCK SHALL COME FROM A LOCAL NURSERY OR BE ADAPTED TO LOCAL GROWING CONDITIONS AND BE GUARANTEED BY THE NURSERY AS SUCH. 6. THE CONTRACTOR SHALL CLEAN THE TOPSOIL OF ROOTS, SODS, STONES, CLAY LUMPS, AND OTHER EXTRANEOUS MATERIALS HARMFUL TO PLANT GROWTH. 7, THE PLANTS SHALL BE SET AT THE SAME DEPTH THAT THEY WERE GROWN IN AND THE TRUNK SHOULD BE SITUATED NEARLY PLUMB. TREES AND SHRUBS SHALL BE STAKED, AS NECESSARY, TO PREVENT THEM FROM OVERTURNING. 8. ALL VEGETATION SHALL BE WATERED THE DAY AFTER PLANTING AND THEREAFTER AS NECESSARY TO ENSURE SURVIVAL UNTIL THE END OF THE GROWING SEASON OF THE FIRST YEAR. 9. THE GRASS SEED MIX LISTED ABOVE SHALL BE SPREAD THROUGHOUT THE ENTIRE STREAM BUFFER MITIGATION AREA. 10. ALL PLANT MATERIAL QUANTITY COUNTS ON THE PLAN ARE THE RESPONSIBILITY OF THE CONTRACTOR. PLANT LIST TOTALS ARE FOR CONVENIENCE ONLY AND SHALL BE VERIFIED PRIOR TO BIDDING. 11. NO CHANGES TO PLANT SCHEDULE UNLESS FIRST APPROVED BY THE ALBEMARLE COUNTY PLANNING DEPARTMENT AND THE LANDSCAPE ARCHITECT. ,TH 0 T/ SCOTT R. COLLINS'Z U No. 35791 2� S10NAL E� z O L Ce U u.a 0 z O H w w U W ZQ O° N U) H W Ce M M M M M Q w o -1 Ln L � N 111 f� 00 1 ul Z ■ • M cyi N M CN 1 0 N N w J w F— Q/ LLJ 2 U 1 u) ui 1 w w F- U) F- w Q 0 N Z i li 1 0 1 i 0 r f y/ ,4 s r Z Z uj I c V r Q CL s S O F Z c z 1--I `J r n < 6 c L �! 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