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WPO201500083 Plan - Stormwater Minor Amendment 2016-02-02
Purpose of This Minor Amendment 1. The purpose of this Minor Amendment is to relocate the Storm Water Management Basin. The original Storm Water Management Basin could not be installed due to existing monitoring- wells in that location. The original Minor Site Plan Amendment was approved on February 1, 2007. 2. The limits of this Minor Amendment are shown on Sheets C-400. 3. For purposes of storm water calculations the existing conditions shown on this plan are what were in place prior to construction of improvements shown on original Minor Site Plan Amendment. 4. The total area of disturbance for this minor amendment is 1.25 acres. # 1 TMP 31-21F t , Earlysville Volunteer Fire Co. -' DB 1666-71 Zoned: Li / N 46'15'38" W �i 291.32' I 1 I TMP 31-21A1 _ 4F, LLC t DB 2037-4370) N •�`�, o Zoned: LI N 33'09'47" W ' �I T47.08 ��]_ �1 rTri ,T& TTT r 41 W' ) r -LjjjL,/ .4 �1,g' E j ' 3 t , t LY Refer +o Sheets G-401 C-601 S 33'38'52" E `'a \�`♦ / i t 32.07' TMP 31-1 OA 4F, LLC DB 1804-200 i 0.5 +/— Acres Zoned: RA / rj TMP 31 19A TMP 31-19 / 4F, LLC DB 1804-200 0.8 +/- Acres Zoned: RA t � \v i i 11 1 PARCEL., OVERVIEW -00 SCALE: 1" = 100' — 4F, LLC ' DB 1804-200 ' 0.4 +/- Acres d, Zoned: RA ' r 506.00' TMP 31-21A 4F,LLC ° DB 1825-1.09 27.1 +/- Acres Zoned: LI E CURVE ARC LENGTH RADIUS DELTA. ANGLE CHORD BEARING CHORD LENGTH C1 194.15' 666.59' 16041'15" S 67059'24" W 193.46 C2 200.25' 1537.17' 7°27'51" S 56009'42" W 200.11' C3 278.86' 185.57' 86006'00' N 33009'11' E 253.35 C4 205.15 168.93 69034'50' N 23°20'46 E 192.77' < > S 1 1 i t 41 % TMP 31-21D1 4F, LLC '\ DB 1804-200 ;� Zoned: RA \ 3, New Storm Water Management Basin r-� , wR� • . Refer to Sheet C-602 Existing Sediment Basin N �Q3i'49" yy (JTQ Be Removed) 0"o' 11J Limits of Minor Site''`�- Plan Amendment 'r WP0201500083 STORM WATER MANAGEMENT MINOR SITS PLAN AMENDMENT FOR EARLYSVILLE Bi?SINESS PARK TAX MAP 31. PARCEL 21A RIO DISTRICT, ALBEMARLE COUN'T'Y, VIRGINIA SITE PLAN NUMBER: WPO PLAN NUMBER: LEGAL REFERENCE: PARCEL ADDRESS: SOURCE OF TITLE: OWNER /APPLICANT: ZONING: MAGISTERIAL DISTRICT: BUILDING SETBACK: SDP200500144; SDP201500012 WP020060039 TM 31 PARCEL 21 A 395 REAS FORD ROAD EARLYSVILLE, VA 22936 DB 1825 PACE 109 w the Albemarle Cut community Development Department Date .� t FilefL 4F, LLC 2885 EARLYSVILLE ROAD EARLYSVILLE, VA 22936 LI — LIGHT INDUSTRIAL AIA — AIRPORT IMPACT AREA RIO 50' FROM PUBLIC RIGHT—OF—WAY 50' FROM RURAL AND RESIDENTIAL DISTRICTS 30' UNDISTURBED BUFFER ALONG RURAL AND RESIDENTIAL DISTRICTS PARKING SETBACK: 10' FROM PUBLIC RIGHT—OF—WAY 30' FROM RURAL AND RESIDENTIAL DISTRICTS SOURCE OF BOUNDARY: PLAT RECORDED IN DB SOURCE OF TOPOGRAPHY: AERIAL SURVEY BY LOUISA AERIAL SURVEYS ON APRIL 10, 2007. FIELD RUN SURVEY BY MERIDIAN PLANNING Gir OUP, LLC. ON FEBRUARY 19, 2015 2—FOOT AND 1—FOOT CONTOUR'S. SWM VOLUME CONTROL: STORM WATER MANAGEMENT BASIN. SWM WATER QUALITY: BIO—FILTER. PUBLIC WATER SUPPLY: THIS PARCEL IS LOCATED WITHIN A PUBLIC WATER SUPPLY RESERVOIR WATERSHED. Land Use Table SITE �N Description Pre -Development -'' 942.00' Post -Development % Buildings 234,976 18.7% TMP 31-21B 19.8% Paved 257,644 4F, LLC 261,525 20.8% Pervious DB 1804-200--'' 60.7% 744,747 TM 3 1 C Zoned: RA --�� ` F, LLC 100.0/0 --'"� TMP 31-21K DB 1804-200 �- Thomas or Catherine Manusco '. Zoned: RA. - ' - DB 1864-665 l --'` Zoned: RA ' 0< I 100' 0 100' 200' 300' ?- : �- SCALE: 1 "=100' WP0201500083 STORM WATER MANAGEMENT MINOR SITS PLAN AMENDMENT FOR EARLYSVILLE Bi?SINESS PARK TAX MAP 31. PARCEL 21A RIO DISTRICT, ALBEMARLE COUN'T'Y, VIRGINIA SITE PLAN NUMBER: WPO PLAN NUMBER: LEGAL REFERENCE: PARCEL ADDRESS: SOURCE OF TITLE: OWNER /APPLICANT: ZONING: MAGISTERIAL DISTRICT: BUILDING SETBACK: SDP200500144; SDP201500012 WP020060039 TM 31 PARCEL 21 A 395 REAS FORD ROAD EARLYSVILLE, VA 22936 DB 1825 PACE 109 w the Albemarle Cut community Development Department Date .� t FilefL 4F, LLC 2885 EARLYSVILLE ROAD EARLYSVILLE, VA 22936 LI — LIGHT INDUSTRIAL AIA — AIRPORT IMPACT AREA RIO 50' FROM PUBLIC RIGHT—OF—WAY 50' FROM RURAL AND RESIDENTIAL DISTRICTS 30' UNDISTURBED BUFFER ALONG RURAL AND RESIDENTIAL DISTRICTS PARKING SETBACK: 10' FROM PUBLIC RIGHT—OF—WAY 30' FROM RURAL AND RESIDENTIAL DISTRICTS SOURCE OF BOUNDARY: PLAT RECORDED IN DB SOURCE OF TOPOGRAPHY: AERIAL SURVEY BY LOUISA AERIAL SURVEYS ON APRIL 10, 2007. FIELD RUN SURVEY BY MERIDIAN PLANNING Gir OUP, LLC. ON FEBRUARY 19, 2015 2—FOOT AND 1—FOOT CONTOUR'S. SWM VOLUME CONTROL: STORM WATER MANAGEMENT BASIN. SWM WATER QUALITY: BIO—FILTER. PUBLIC WATER SUPPLY: THIS PARCEL IS LOCATED WITHIN A PUBLIC WATER SUPPLY RESERVOIR WATERSHED. Land Use Table SITE �N Description Pre -Development % Post -Development % Buildings 234,976 18.7% 248,256 19.8% Paved 257,644 20.5% 261,525 20.8% Pervious 761,908 60.7% 744,747 59.4% Total 1,254,528 100.0% 1,254,528 100.0/0 O� LEGEND PP POWERPOLE 2 VI C (N (TY MAP SCC S;TORMWATER CONVEYANCE CHANNEL c—oo SCALE: 1 2000' �a - BUILDING SETBACK -~ ° PARKING SETBACK SIGNATURE PANEL SHEET INDEX C400 ......... C;'OVERSHEET C-401......... EXISTING CONDITIONS & DEMOLITION PLAN C-601........ SITE PLAN C-602 ........ SATE DETAILS C-603 ........ SiTORM WATER MANAGEMENT PROFILE C-604 ........ STORM WATER MANAGEMENT CALCULATIONS C-605 ........ D)RAINAGE AREAS APPROVALS DATE DEPARTMENT OF COMMUNITY DEVELOPMENT i1 PLANNER/ZONING Q ENGINEER z INSPECTIONS 0 a ARB DEPARTMENT OF FIRE RESCUE CV q o� VIRGINIA DEPARTMENT OF TIRANSPORTATION 0 CQ co Njco HEALTH DEPARTMENT Q 5Ca Lli 00 M 0 C) r Z z z Q W W m � � � o w a ::D ::D o CD M©© 17 44 i1 Q� Q o, z 0 a ti0 V CV q o� 0 CQ co Njco Lli 00 M 0 C) r Z z z Q W W m � � � o w a ::D ::D o CD M©© z 0 a P� CQ CQ CV q o� 0 CQ co Njco I� Q 5Ca co (0 _r "t V) z �. W 0< I w 6i ?- : �- Z m m m z Q Q o 0 M U) W W O W 0 Cif 0 o LJJ U F- U) Lli 00 M 0 C) r Z z z Q W W m � � � o w a ::D ::D o CD M©© 0 a P� CQ CQ CV q o� 0 CQ co Njco I� Q 5Ca W W .• W H z %Nz z W Lli 00 M 0 C) r Z z z Q W W m � � � o w a ::D ::D o CD M©© SHEET NO. C�40 SHEET � of 7 w N W 0) Z Z Z W F- U) W o W w tZ Cf) SHEET NO. C�40 SHEET � of 7 �7T1,, cv 1 / , I ! `\-\ \ Lip `<'.OO , // r/(0t0 ° N i l / ( t 1 1 / / /1 I 1 1 / l r /� 1 j ~' �-» r 1 % ~�'�•• 1 �. ; r t to � I ' �j 1 1, I J J ` `" ^ __ J .. ,--.®,L { { J `, d d- U) 1' +r ;�' r i �'` -'-- Jt o <c �- tt t1A '� o = 3 t ccs t = i + o� t 3 1 1 / l Ill J _�� __�_ %�..��` i L.�i � i t \ i I ( t _ ( C + 1 / ( / / r J J J.. t ` \ ` a . ^` / / ® I— —1 M m M o o ry z C) V) = 1 \ j\� } J J'�� \ — _' rJ�i t (11L i J ! o U 11 `%° _ t r -J o 0 0 H � � CQ W eo / - _-------- Ems_, W / I � o / 1 ` •., f r I % C � { _ � � l � J / � J / j 1/ � j I / f � / !! � _ '- � l \� JI i---� � a � I f / ".,, „u _ J t / � /� ` r / / �' // r /� � � / i / ��� l --"' ___- '1 ( '� + !J! t ' ; � % // � / o / , ✓ '/ _- _ _ . ``'` . '' _ `\ r � W 'ct+ / / ► a / r �, / -_ - / \ J � / • t t r j 1 1 j J J l %f'7D/ 0 Q0 Warehouse Budin l !1 1 \ \ \ \i \ \ `� � 1 � � '%�' _.._- ,� .� / / ! / i , / � � � { I F- ..., •,�'"""--. � 1 111 ( 1 1 1 t � ' �' � —1 ` .�x__��� l '� 11 l!f + ` 1 / / LJ C) t CO iso p'\ �� / }— o N Jj L�1r Cl- © Lj Existing conditions were constr=ucted prior to ' ! \ /Q�l / \ \ ` `a 0 ` �` //y1�� /✓� �r � ME M °J stormwater management r(egulations. '' �' j _ ` ` �' `� ` �'� o���' ,� /r i2 Consequently, stormwater mancagement is not-`` ������ f' <`\ C) required for what is shown can this plan. 1 \ \ / i \ w _ r Storm Inlet\N (To Remain)-� \ ; ti l \ \\ \ it , Asphalt Parking i 1 \ ` \ `, \ (To Remain) / �� \ / / ` \\ Storm inlet \r r \ — � -- -- ---- t / Q To Remain /'`.'/— -- / -.___ __._, �-'� F, l` � j ~ —_--•-.,/' `--- ---- ---. _ _ .. M t r � � \ � -- � --' ` ' I / 1 rl J J1 \ � \ \ \ � \ �` `` \ � ` \ a C1 U� r�i .�'i _----Asphalt Parking--------* APortiQn To Be Removed) — �` — `--� �' -_ �- ; _ _. - i , -590— �` �-.�t _ _ Grovel prty -- _ _ — / \ r�'_ ~/ � } _ _ — — — �-- — — PhU afkineway / _ \ (T0 Be Removed _ - _-�' _ / 7\ _ . - " _ / (Portion � o -Be Removed) — 12 orr - - s ) - J ~�\ ' (Portiotr To- R&T oved} � � 1 /'-----__�-_ Storm Inlet � � / � � � r- }1(1 (To Be Removed) �';\ 600 LU Ld ICO ,' ' ,' ' ` • - - �_ t ' / SHEET N0. 40' 0 40' 80' 120' C-401 SCALE: 1"=40' S H EET 2 of 7 O / !, t j � if t i { (( rJ t `""---... / j f -_ )vim I 1\ � t ( i i\ \ \, � •. \\ \ \\ , A / t ! t ! t l 1 10 t/ 1( It a / s r 1 1 f ! t ` "\ \ - --- ---- � \ \ \ \ �3, /! // / It (r /, / / t // / / :;:6 -_ ( /l f 1 40 1117 0 40 80 120 1 ��\ Of t SCALE: 1 "=40' O g F— Ci a F=�v 0) fl/ �.�`r �% j f \ \\ ~�—T'1—_ 1 --\\ \\ \\ \\ \ �\ ` Ifl �d,� 1 ,.. 1 � � , •,� � �- *, � \ .• �\ i/ � / 1 \ / /✓ f/ f' t' �/ /. '` J✓/t t f t' � r% , t tt/ � % � l � / / i � '� � C� l % � ? l / l `� ...,\\ \\ C) I/ '„1 t / ! i ����p r----� \\ \y_ \ \\\\ \�\\ \ C,4 0J \ \ \ ``. 20 u �� 11`1 / � / �` \� ` �� `\ \ \ � � tr ,' t / C ✓ tr /' / /' /r ' / '-�/ / I t' '� p a �� ��o ``' i '-- _ , l `\ \� `\ \ t,_ 1_ l o �c -Dl r r`\\ \\ \\ �-- ,. \ \ w 6i t f \ `, " �\ z �t 0D Cf) w s C) C) w t CD , ( ! a f 1 + ! I ! l ( f tt %f / f f I I y, ._` 1 1 1! 1j7• `` 1 4t If `+ 1 t4 t i "i \\ `\"\\ \�` \ ! / f 1 1 i r Y—�I y j f 1 e \ f O �..` 1 L / _. 1 \ 1 1 C\2cel / / \ ',` tt 1t \ \ \ \ \ \ \ t } l / t ' ! ` \ \ e tt f /r J / }�, C11 c�7 m z t " � v . -\ ,t ! l / 1 1 r--1 / i ✓ \ � � \ ``•. t t 1 `� �'' r� a, CJ l It per_, t1, 'r � 0 / /' / '/ ~sJ ♦ r (/+,// / ( / !1 tt 1 tt Ln r ,, / / �/ _ J j � / // ti � , f � � � � � 1 f f / 1 i � /,r ti_ `-- \ — "\ t J, // ✓�,-- ''/ ''��i T; � ,�� !r it / / � (z, -------- 0 _- CD tea° , / / ~ 1-Y a_ I� ' ( d /,'/ / / � ♦l / tt / i / I Jl � � / I tt jt '1 / 1 tt (( � / / / l � `'' �\\ \\\ ' _ -_ �' / / (t 11 Warehouse 8uiidin / r ! t i l / �- \ L Q7 g t tl ! t ' 11 / ' / -' C� o /��- New Emergency Spillway �y U) V)s- f-- I t _ t 1 i �. a a Co J l °� C) New CUIVet �/ // O �' - 0 ` C.) Ci -24n HDPE © J/ j ) 2.0% \s Je,I''/ ///,// / •„ „ cLrL- J Existing J Invn=.26 ostormwoter management regulations. Out-566.09..: t�/ Consequently, stormwater management is not required for what is shown on this plan. / t �, J f l t ` ~ o ,\ ■ - '�' �' Storm Inlet New Storm Water % !} i t \ \� - - ,,y \ 55� % J Management Basin \ \ \ 5 (Ta Remain \ t t t `\ \ ` _ / __ ) New Office �\ �\ ' \\ �\ �\ `� �� _ / ' fRee�Q De a' s / \ Building Asphalt Parking 11 $;4. (To Remain) It f( �► t / }-�-i � � /I Storm Inlet ' New Office (To Remain) t' / Building New asphalt Parking Area f l \ \ \\� }, \\ ^\ �/ ! t` '' --.__------.•.c._ \,i f--.." ..` .._,_ � s j \. \ !'S,n � — / J "7 7- _ — --� = , ` \ j 590— 3 \ lVt rw \ \ " \�' i� ii ~\ \ \S ! W New — — _ \ .� ` \\ u \ Qa' \) / �" Privat spphalt �- ---�' .���_ / �\ i �+ .+` „# \ �`.� \,� �\\ '\ i "` "" �\Uj - ) � Road '� / aYt',♦ \ \ \ \ w 24" / c' t t 0, s+ s \ i \\ l " \ `\ \\� t N 600 - 1 _ t ` \ t �\ r— I t \ \\ ��4 " \` \ " \ (LLJ J \ S -� Ne�C\yep°!' tt "` "\ t \\ \� "t \ \\ � cn SHEET N0. U�601 \ l SHEET 3 of 7 -' \ �\ In N4 0 n - -- - Existing Trees / (To Be Removed)It / C) M --550--. i 1 It J CD \\\ \\\\ t`\ i '"f ~- Existing Sediment Basin \ \\ \ \\ r r--�" s — -- (To Be Removed) + / C &A \ \ \ \ \ ` \ `\ \ �� \ / { r' .-�/' Existing Outfall }�� �\ `\ \ \ \ `\ `, \ ss \\\ \\ �i-_ _ ' \ `�__� Structure and \ e \ \ \ - Embankment r, \ \ ` \ \ \ \ \ \ \ - \ (To Be Removed) \ \ \ \ \ � \ \ \ .,, •, ~, ~ -_. '- � '` .` / � 542. \ \ \ \ \ -----546-- \ A EXISTING CONDITIONS 4a' 0 40' 80' 120' 20 C-60SCALE: 1" = 40' SCALE: 1"=40' VDOT #3, #357, #5, #56 OR #57 COARSE AGGREGATE IN GALVANIZED WIRE MESH BAS * FILTER CLO SECURE WIRE TO GROUND WITH WIRE STAPLES --7 40' 1 10' I 3' MAX SLOPE=6.0% MAX SLOPE=2.0% LENGTH=92' SECURE WIRE MESH TO TIMBER 6X6 TREATED TIMBER TOP ELEV=558.00 #5 REBAR TO SECURE TIMBER 1 BOTTOM ELEV=557.00 NOTES: 1. The following guidelines were determined from the Virginia DEQ Stormwater Design Specification No. 2. 2. 13 feet of level spreader length was used per every 1 cfs of inflow for discharges to a conserved open space consisting of native grasses/thick ground cover. 3. For the purposes of determining the Level Spreader length, the peak discharge was determined using the Rational Equation with an intensity of 1-inch/hour. LEVEL SPREADER WITH RIGID LIP * MIN. PHYSICAL REQUIREMENTS OF FILTER CLOTH NOTED IN STD. & SPEC. 3.19, RIPRAP SOURCE: VA. DSWC AND N.C. Erosion and Sediment Control Planning and Design Manual PLATE: 3.21-2 ENGINEERED LEVEL SPREADER (ELS) SCALE: NTS A J\ w �o to In 0 J r o < O,yj,� O Quo I A Q ELS Length ELS Length Description C Intensity Area Total Flow Required @ Provided C -Factor (in/hr) (Acres) (cfs) 13ftper cfs (ft) Unimproved 0.20 1.0 7.14 1.43 - Asphaltic 0.79 1.0 7.14 5.64 - Totai I 1 1 14.28 7.07 91.89 92 LEVEL SPREADER WITH RIGID LIP * MIN. PHYSICAL REQUIREMENTS OF FILTER CLOTH NOTED IN STD. & SPEC. 3.19, RIPRAP SOURCE: VA. DSWC AND N.C. Erosion and Sediment Control Planning and Design Manual PLATE: 3.21-2 ENGINEERED LEVEL SPREADER (ELS) SCALE: NTS A J\ w �o to In 0 J r o < O,yj,� O Quo \\ /r \ \ \ \ \ — i 0 1t \ l � � � � \ \ t 1 \ ; \ sl 00 co gz New Engineered Leve prear .J> �'� �. \l\ 4 ++ �'` Ua w - 1 See Details , `. o/ / '♦ i + 1 I / f/ r \oc5e, / •'�. / , l > ; ' - r t 1 �' ~\ ! / / t�t it •, / t , ` ` y y y /�! / *#4r if J f i �4 W -_'% ."'.'- ,-_ � // / II / �' \ l / // .♦�r,(/ / , i' i ,' ��� � '//41 \� "✓'.''' / 11 l- ' / J/ t �� P®ermanent Access & \/� , , % i►' r �'� Conservation Easement'en i r of Minor ,Ite P1a1l1tt #/ ti !s \ �� `7 t IlilftltiylltiiTT4t111t1111lllOit!!tY! „ /' t, , , ` SCC-11CD C14 tl,snt - \ fan O w w \ II 5 s til_ n- a o - I � ----555_ _ J ` o If If CN --- Awl; Ilk SCC-? 32� �i 0 'm00% 34—x\` 38 r — Jim �e��►�t�`�O,f �j\�L' � 10 -542 \ raj V) U) \ \ \ \ LLJ Lt_3 Lj ry SHEET NO. C-601' ti B SITE PIAN 40 0 _ 40' 8.0' y 120' � C-60 SCALE: i = 40 20 f SCALE: 1 "=40' e ��c° SHEET 4 0f 7 L0 O Z O t V7 ry d ¢ m m m ® v z t� M cn Lit III O0 Q Z "e ry Fn iLj 0 ® \\ /r \ \ \ \ \ — i 0 1t \ l � � � � \ \ t 1 \ ; \ sl 00 co gz New Engineered Leve prear .J> �'� �. \l\ 4 ++ �'` Ua w - 1 See Details , `. o/ / '♦ i + 1 I / f/ r \oc5e, / •'�. / , l > ; ' - r t 1 �' ~\ ! / / t�t it •, / t , ` ` y y y /�! / *#4r if J f i �4 W -_'% ."'.'- ,-_ � // / II / �' \ l / // .♦�r,(/ / , i' i ,' ��� � '//41 \� "✓'.''' / 11 l- ' / J/ t �� P®ermanent Access & \/� , , % i►' r �'� Conservation Easement'en i r of Minor ,Ite P1a1l1tt #/ ti !s \ �� `7 t IlilftltiylltiiTT4t111t1111lllOit!!tY! „ /' t, , , ` SCC-11CD C14 tl,snt - \ fan O w w \ II 5 s til_ n- a o - I � ----555_ _ J ` o If If CN --- Awl; Ilk SCC-? 32� �i 0 'm00% 34—x\` 38 r — Jim �e��►�t�`�O,f �j\�L' � 10 -542 \ raj V) U) \ \ \ \ LLJ Lt_3 Lj ry SHEET NO. C-601' ti B SITE PIAN 40 0 _ 40' 8.0' y 120' � C-60 SCALE: i = 40 20 f SCALE: 1 "=40' e ��c° SHEET 4 0f 7 n slope velocity Q 0.050 0.015 2.7 �16 \VDOT EC -3 Blanket/Matting 1' 2' Rip—Rap d5O=6" New Emergency Spillway 48" Diameter Riser w/An i—Vortex Device A 575 Crest Elev=566.50 Elev=566.75 1100 YR W.S.E=567.41 � W s New Orifice w/Metal _ < 15" Dia. / Inv Elev=563.50 Bottom of Basin=563.00 New 32'-24" RCP {� 0,50% Upper Inv = 563.00 New 35'-24" RCP {� 0.50% Lower Inv = 562.83 Upper Inv = 563.00 Lower Inv = 562.83 570 0, P�a� ' 00 Q � r Z New Sto mwater Conveyance Channel iCN 565 - W Slope = 1.5% or —i End Level Spreader Begin Level Spreader Q Q 1 M m m 560 0 Z C) Cf) M V Q rLr (LJ 555 10+00 11+00 12+00 13+00 14+00 7 Z LLSTORM PROFILE - VERT SCALE: 1 = 5 n ls, HORZ SCALE: 1"= 20' p �'[ H CQ N Z a �a 0 � I W a Co z 575 coF Tap of Berm=568.50 New Primary Outlet Structure wiZ P4©0 � P. Z 570 � � Z Z l� � Z 565 W �C i T_ 560 U d 7 555 15+00 16+00 17+00 2 STORM PROFILE _ C-60 VERT SCALE: 1" = 5' HORZ SCALE: 1"= 20' U') � w t - � CD � M CD o C14 cw Trapezoidal Channel Parameters SCC -1: 2 -year flow calculations Z 0 w w �- Uj � w � O � z z Trapezoidal Channel Parameters SCC -1: 10-yearflow calculations o o Trapezoidal Channel Parameters SCC -2: 2 -year flow calculations z Trapezoidal Channel Parameters SCC -2: 10 -year flow calculations W DESIGN NOTES: 1. Refer to Energy Balance Calculations for 2 -year and 10 -year flowrates. W Z W Channel 0 W o E --- w LA W w w o W � s CL � SHEET N0. C-603 3 STORM WATER CONVEYANCE CHANNEL DETAIL -60 SCALE: NTS SHEET5of7 n slope velocity Q 0.050 0.015 2.7 �16 \VDOT EC -3 Blanket/Matting 1' 2' Rip—Rap d5O=6" New Emergency Spillway 48" Diameter Riser w/An i—Vortex Device Width=l0' Crest Elev=566.50 Elev=566.75 1100 YR W.S.E=567.41 � s New Orifice w/Metal Screen 15" Dia. / Inv Elev=563.50 Bottom of Basin=563.00 New 32'-24" RCP {� 0,50% Upper Inv = 563.00 New 35'-24" RCP {� 0.50% Lower Inv = 562.83 Upper Inv = 563.00 Lower Inv = 562.83 n slope velocity Q 0.050 0.015 2.7 �16 n slope velocity Q 0.050 0.015 3.6 37.3 n slope velocity Q 0.038 0.023 4.2 12.0 n slope velocity Q 0.038 0.023 5.5 44.5 STORMWATER CONVEYANCE CHANNELS TYPE W D LINING SCC -1 4' 2' \VDOT EC -3 Blanket/Matting SCC -2 1' 2' Rip—Rap d5O=6" Virginia Runoff Reduction Method ReDeveiopment Worksheet v2.8 Revised April 2011 To be used with 2011 BMP Standards. and Specifications Site Data Pre-ReDevelopment Land Cover (acres) A soils B Soils A soils B Forest/Open space (acres) - undisturbed, Forest/Open Space protected forestlopen space or reforested land 171 Managed Turf (acres) - disturbed, graded for M" yards or other turf to be mowed(managed 0.15>: Impervious Cover (acres) 0;22 Total Disturbed Acreage Nitrogen EMC (mg/L) :t36 -- ice- rt.anuc - ITatals A Forest/Open Space (acres):- undisturbed: A soils B Soils _. '. D Soils Forest/Open Space 0.02: 171 protected forest/open Space or reforested land 0 05 Managed Turf. .. 0.15>: 0,20 0;22 0,25 Impervious Cover Managed Turf acres disturbed,.graded for Oi95 0:95 095 A Forest/Open Space (acres):- undisturbed: A soils B Soils C Soils D Soils Forest/Open Space 0.02: �� ` a• protected forest/open Space or reforested land 0 05 Managed Turf. .. 0.15>: 0,20 0;22 0,25 Impervious Cover Managed Turf acres disturbed,.graded for Oi95 0:95 095 \ � ` - . Rv(impervious) t yards or other turf to be mowed/managed Total Site.Area (acres) 0 Site Rv 4 e`>> .,` . 01 Imp ervious Cover (acres) #N/A #N/A mowed/managed H ll 1 Pre -Development Treatment Volume (acre #) r Impervious. Cover (acres). €'re-Oevelopmen# Treatment Volume (cubic ��"� c � ,r\�� Total feet):\ Area Check Okay Okay Okay Okay "\ - - A soils B Soils C Soils D Soils Forest/Open Space 0.02: £3.0.3 #7:!14 0 05 Managed Turf. .. 0.15>: 0,20 0;22 0,25 Impervious Cover 0.95` Oi95 0:95 095 Land Cover Summary Listed Adjusted" Pre-ReDevelonment "Adjusted Land Cover Summary, reflects the pre redevelopment land cover minus the pervious land cover (forest/open space or managed turf) acreage proposed for new impervious co.er_ The adjusted total acreage is consistent with the Post Redevelopment acreage (minus the acreage of new impervious cover). The load reduction requriement for the new impervious cover to meet the new development load limit is computed in Coluinn i. Pre -Development Load (TN} (Iblyr) Land Cover Summary Post-ReDevelopment Maximum % Reduction Required Below Pre-ReDevelopment Load. ..`''n \ `: TP Load Reduction Required for :e` Redeveloped Area b r w \ Total Load Reduction.Required ` 's 11"N"t, In (Iblyr)v 11 Post -Development Load (TN} (ibly.r) ;. n .�\ Land Cover Summary Post-ReDeveiopment New Impervious 75°10 runoff volume reduction" treated area New Impervious Cover acres`' Forest/Open Space corer {acres) NimpenAous) % Impervious Drainage Area A Land Cover (acres) for treated area W.75 Composite Rv(forest) e::;': •s, _ a �, New Dev. Site RV % Forest A soils B Soils Managed Turf Gowr (acres) e. UM Composite Rv(#urs'_>�,� % Managed Turf Forest/Open Space (acres) - undisturbed, protected forestlopen Impervious Cover (acres) <.E ,.t.. '' ;;::..:: �.a• R€e\@,': \:`.: � ` - . Rv(impervious) % impervious TreaJ(Iblyr) Total Site.Area (acres) 0 Site Rv 4 e`>> .,` . 01 Post-Aevetcpment Load (TP) .`..�:. �...�:. #N/A #N/A mowed/managed H ll 1 Pre -Development Treatment Volume (acre #) r Impervious. Cover (acres). €'re-Oevelopmen# Treatment Volume (cubic ��"� c � ,r\�� `� •:\��: feet):\ \ x: �\ Toial Vin; "\ Pre -Development Load (TP) (I r) ; .,E\:'�•,�\ "Adjusted Land Cover Summary, reflects the pre redevelopment land cover minus the pervious land cover (forest/open space or managed turf) acreage proposed for new impervious co.er_ The adjusted total acreage is consistent with the Post Redevelopment acreage (minus the acreage of new impervious cover). The load reduction requriement for the new impervious cover to meet the new development load limit is computed in Coluinn i. Pre -Development Load (TN} (Iblyr) Land Cover Summary Post-ReDevelopment Maximum % Reduction Required Below Pre-ReDevelopment Load. ..`''n \ `: TP Load Reduction Required for :e` Redeveloped Area b r w \ Total Load Reduction.Required ` 's 11"N"t, In (Iblyr)v 11 Post -Development Load (TN} (ibly.r) ;. n .�\ Land Cover Summary Post-ReDeveiopment New Impervious TP Load Reduction Required: for 1` '° 1100\3$ .. New Impervious Area (Ibiyr) ALBEMARLE COUNTY ENGINEERING GENERAL STORMWATER MANAGEMENT NOTES 1. All dams and constructed fill to be within 95% of maximum dry density and 2% of optimum moisture content. All fill material to be approved by a geotechnical engineer. A geotechnical engineer is to be present during construction of dams. 2. Pipe and riser joints are to be watertight within stormwater management facilities. 3. For temporary sediment traps or basins which are to be converted to permanent stormwater management facilities; conversion is not to take place until the site is stabilized, and permission has been obtained from the County erosion control inspector. Site Results IMPERVIOU IMPERVIOUS COVER TL TURF AREA ARE ALBEMARLE COUNTY ENGINEERING GENERAL CONSTRUCTION NOTES 1. PRIOR TO ANY CONSTRUCTION WITHIN ANY EXISTING PUBLIC RIGHT-OF-WAY, INCLUDING CONNECTION TO ANY EXISTING ROAD, A PERMIT SHALL BE OBTAINED FROM THE VIRGINIA DEPARTMENT OF TRANSPORTATION (V.D.O.T.). THIS PLAN AS DRAWN MAY NOT ACCURATELY REFLECT THE REQUIREMENTS OF THE PERMIT. WHERE ANY DISCREPANCIES OCCUR THE REQUIREMENTS OF THE PERMIT SHALL GOVERN. 2. ALL MATERIALS AND CONSTRUCTION METHODS SHALL CONFORM TO CURRENT SPECIFICATIONS AND STANDARDS OF VDOT UNLESS OTHERWISE NOTED. 3. EROSION AND SILTATION CONTROL MEASURES SHALL BE PROVIDED IN ACCORDANCE WITH THE APPROVED EROSION CONTROL PLAN AND SHALL BE INSTALLED PRIOR TO ANY CLEARING, GRADING OR OTHER CONSTRUCTION. 4. ALL SLOPES AND DISTURBED AREAS ARE TO BE FERTILIZED, SEEDED AND MULCHED. 5. THE MAXIMUM ALLOWABLE SLOPE IS 2:1 (HORIZONTAL: VERTICAL). WHERE REASONABLY OBTAINABLE, LESSER SLOPES OF 3:1 OR BETTER ARE TO BE ACHIEVED. 6. PAVED, RIP -RAP OR STABILIZATION MAT LINED DITCH MAY BE REQUIRED WHEN IN THE OPINION OF THE COUNTY, OR DESIGNEE, IT IS DEEMED NECESSARY IN ORDER TO STABILIZE A DRAINAGE CHANNEL. 7. ALL TRAFFIC CONTROL SIGNS SHALL CONFORM WITH THE VIRGINIA MANUAL FOR UNIFORM TRAFFIC CONTROL DEVICES. 8. UNLESS OTHERWISE NOTED ALL CONCRETE PIPE SHALL BE REINFORCED CONCRETE PIPE - CLASS ill. 9. ALL EXCAVATION FOR UNDERGROUND PIPE INSTALLATION MUST COMPLY WITH OSHA STANDARDS FOR THE CONSTRUCTION INDUSTRY (29 CFR PART 1926). DA. A D.A. B DA. C D.A. D D.A: E AREA CHECK Phosphorous TOTAL PHOSPHOROUS LOAD REDUCTION REQUIRED (LB/YEAR) \ .. RUNOFF REDUCTION ti .\ \ PHOSPHOROUS LOAD REDUCTION ACHIEVED ADJUSTED POST -DEVELOPMENT PHOSPHOROUS LOAD REMAINING. PHOSPHOROUS LOAD REDUCTION (LB/YR) NEEDED CONGRATULATIONS!! YOU EXCEEDED THE TARGET REDUCTION BY 2.2 LBIYEARH Nitrogen (for information purposes) RUNOFF REDUCTION (ci} NITROGEN LOAD REDUCTION ACHIEVED ADJUSTED POST -DEVELOPMENT NITROGEN LOADJP) (lb l r r Drainage Area A 75°10 runoff volume reduction" treated area New Impervious Cover acres`' ? '- -: f nq , \ • \ 0 tTs oWN \ >` �? .. : \ : \ \Zc\\ NimpenAous) % Impervious Drainage Area A Land Cover (acres) for treated area W.75 Total New Dev. Site Area (acres) .,. New Dev. Site RV \v hhe'ut"�v" A soils B Soils C Soils D Soils Totals Land Cover Rv PHOSPHORUS REMOVAL BY PRACTICES THAT D0 NOT REDUCE RUNOFF VOLUME IN D.A. A Forest/Open Space (acres) - undisturbed, protected forestlopen Post -Development Treatment \ Volume (acre-ft)fi 4.68 TreaJ(Iblyr) �Post-De+etopment 0 Volume (cubi Managed Turf (acres). -disturbed, graded for yards or other turf to be; DA. ECN 01 Post-Aevetcpment Load (TP) .`..�:. �...�:. TP Load Reduction Required: for 1` '° 1100\3$ .. New Impervious Area (Ibiyr) ALBEMARLE COUNTY ENGINEERING GENERAL STORMWATER MANAGEMENT NOTES 1. All dams and constructed fill to be within 95% of maximum dry density and 2% of optimum moisture content. All fill material to be approved by a geotechnical engineer. A geotechnical engineer is to be present during construction of dams. 2. Pipe and riser joints are to be watertight within stormwater management facilities. 3. For temporary sediment traps or basins which are to be converted to permanent stormwater management facilities; conversion is not to take place until the site is stabilized, and permission has been obtained from the County erosion control inspector. Site Results IMPERVIOU IMPERVIOUS COVER TL TURF AREA ARE ALBEMARLE COUNTY ENGINEERING GENERAL CONSTRUCTION NOTES 1. PRIOR TO ANY CONSTRUCTION WITHIN ANY EXISTING PUBLIC RIGHT-OF-WAY, INCLUDING CONNECTION TO ANY EXISTING ROAD, A PERMIT SHALL BE OBTAINED FROM THE VIRGINIA DEPARTMENT OF TRANSPORTATION (V.D.O.T.). THIS PLAN AS DRAWN MAY NOT ACCURATELY REFLECT THE REQUIREMENTS OF THE PERMIT. WHERE ANY DISCREPANCIES OCCUR THE REQUIREMENTS OF THE PERMIT SHALL GOVERN. 2. ALL MATERIALS AND CONSTRUCTION METHODS SHALL CONFORM TO CURRENT SPECIFICATIONS AND STANDARDS OF VDOT UNLESS OTHERWISE NOTED. 3. EROSION AND SILTATION CONTROL MEASURES SHALL BE PROVIDED IN ACCORDANCE WITH THE APPROVED EROSION CONTROL PLAN AND SHALL BE INSTALLED PRIOR TO ANY CLEARING, GRADING OR OTHER CONSTRUCTION. 4. ALL SLOPES AND DISTURBED AREAS ARE TO BE FERTILIZED, SEEDED AND MULCHED. 5. THE MAXIMUM ALLOWABLE SLOPE IS 2:1 (HORIZONTAL: VERTICAL). WHERE REASONABLY OBTAINABLE, LESSER SLOPES OF 3:1 OR BETTER ARE TO BE ACHIEVED. 6. PAVED, RIP -RAP OR STABILIZATION MAT LINED DITCH MAY BE REQUIRED WHEN IN THE OPINION OF THE COUNTY, OR DESIGNEE, IT IS DEEMED NECESSARY IN ORDER TO STABILIZE A DRAINAGE CHANNEL. 7. ALL TRAFFIC CONTROL SIGNS SHALL CONFORM WITH THE VIRGINIA MANUAL FOR UNIFORM TRAFFIC CONTROL DEVICES. 8. UNLESS OTHERWISE NOTED ALL CONCRETE PIPE SHALL BE REINFORCED CONCRETE PIPE - CLASS ill. 9. ALL EXCAVATION FOR UNDERGROUND PIPE INSTALLATION MUST COMPLY WITH OSHA STANDARDS FOR THE CONSTRUCTION INDUSTRY (29 CFR PART 1926). DA. A D.A. B DA. C D.A. D D.A: E AREA CHECK Phosphorous TOTAL PHOSPHOROUS LOAD REDUCTION REQUIRED (LB/YEAR) \ .. RUNOFF REDUCTION ti .\ \ PHOSPHOROUS LOAD REDUCTION ACHIEVED ADJUSTED POST -DEVELOPMENT PHOSPHOROUS LOAD REMAINING. PHOSPHOROUS LOAD REDUCTION (LB/YR) NEEDED CONGRATULATIONS!! YOU EXCEEDED THE TARGET REDUCTION BY 2.2 LBIYEARH Nitrogen (for information purposes) RUNOFF REDUCTION (ci} NITROGEN LOAD REDUCTION ACHIEVED ADJUSTED POST -DEVELOPMENT NITROGEN LOADJP) (lb l r r Drainage Area A 75°10 runoff volume reduction" treated area 0).75 ? '- -: f nq , \ • \ 0 tTs oWN \ >` �? .. : \ : \ \Zc\\ 75% runoff volume reduction Forest (acres) Drainage Area A Land Cover (acres) for treated area W.75 2;3, �� \' \, O ` TOTAL IMPERVIOUS COVER TREAiTED ac Roo 0.00 A soils B Soils C Soils D Soils Totals Land Cover Rv PHOSPHORUS REMOVAL BY PRACTICES THAT D0 NOT REDUCE RUNOFF VOLUME IN D.A. A Forest/Open Space (acres) - undisturbed, protected forestlopen A (Iblyr) SEE WATE R; Q1}ALITYCOMP LIANCE TAB FOR'SIITE COMPLIANCE CALCULATIC NS 0 4.68 space or reforested land ti talk Q°114 0 \c: Y" #N/AA Managed Turf (acres). -disturbed, graded for yards or other turf to be; DA. ECN 01 ,; \ #N/A #N/A mowed/managed H ll 1 r Impervious. Cover (acres). fi 0d , } is Q t31i ff OD \ :ac, 1.4 Toial h "\ Post Development Treatment Volume (cf) tK } Apply Runoff Reduction Practices to Reduce Treatment Volume &, Post -Development Load in Drainage Area A Phosphorus Untreated Volume from Remaining Load from Phosphorus Phosphorus Remaining Credit Area Upstream RR Runoff Runoff Phosphorus Upstream RR Load to Removed By Phosphorus r:rertit Unit. Description of Credit. Credit (acres) Practice (cf) Reduction (cf) Volume (cf) Efficiency V%) Practices(Ibs} Practice (Ibs.) Practice (lbs:) Load (ibs.) Downstream Treatment: to be Employed to Conservation impervious acres draining to conserved open spacefor turf acres draining to conserved 75°10 runoff volume reduction" treated area 0).75 ? '- -: f nq , \ • \ 0 tTs oWN \ >` �? .. : \ : \ \Zc\\ 75% runoff volume reduction Forest (acres) Alb Soils (Spee #2) open space for treated area W.75 2;3, �� \' \, O ` TOTAL IMPERVIOUS COVER TREAiTED ac Roo 0.00 TOTAL TURF AREA TREATED {ac} 62.62 AREFA CHECK OK. 0.0c 1.75 PHOSPHORUS REMOVAL BY PRACTICES THAT D0 NOT REDUCE RUNOFF VOLUME IN D.A. A TOTAL. PHOSPHORUS REMOVAL IN D.A. A (Iblyr) SEE WATE R; Q1}ALITYCOMP LIANCE TAB FOR'SIITE COMPLIANCE CALCULATIC NS NITROGEN REMOVAL BY PRACTICES THAT DSD NOT REDUCE RUNOFF VOLUME IN D.A. A TOTAL NITROGEN REMOVAL IN D.A. A (Iblyr) Site Rv ASoils BSoiis CSol is DSoiis Total %of Total Forest (acres) 0.0c 0.00 0.00 0.00 0.00 0.00 Turf (acres) 0.0c 2.93 Roo 0.00 2.93 62.62 impervious (acres) 0.0c 1.75 0.00 0.00 1.75 3739 D.A. C CN 0 #N/A 4.68 .100.170 Site Rv 0.48 Post DevelopmentTretatment Volume#e) :8162 Pos# Development TP Road (Ib/yr). 5.13 Post Development TN Road (Ib/yr) 36:69 Total TP Load Reductiom Required (Ib/yr) 2.65 Total Runoff Volume Reduction (ft) 6122 Total TP Load Reduction. Achieved (ib/yr) 4 Total TN load Reduction Achieved (lb/yr) 27.48 Adjusted Post Development TP Load (ib/yr) 1.2 Remaining Phosphorous. Load Reduction (Lb/yr) Required 0 0„ Drainage Area Sumnnary Drainage Area Compliance Summary D.A. A D.A. B D.A. C I DA. D D.A. E I Total TP Load Red. (!b/yr) 3.84 6,od 0.0d 0. 0. 3.84 TN Load Red. (ib/yr) 27.4 0• O.M 0.001 0.00 2748 • ® !!# #01 f1# 1! i 0 #N/A #N/A (Pervious): Drainage Area Compliance Summary Drainage Area A Summary Land Cover Summary D.A. A D.A. B D.A. C I DA. D D.A. E I Total TP Load Red. (!b/yr) 3.84 6,od 0.0d 0. 0. 3.84 TN Load Red. (ib/yr) 27.4 0• O.M 0.001 0.00 2748 Drainage Area A Summary Land Cover Summary BMP Selections Practice ASoils B Soils C Soils DSoiis Total % of Total Forest (acres) 0: 0_00 0.00 0.00 0.00 0.00 Turf (acres) 0.00 2.93 0.00 0.00 2.93 62.61 impervious (acres) 0.00 1.75 0,00 0.00 1.75 37..39 BMP Selections Practice Credit Area (acres) Downstream 2 -year storm Adjusted CN 10 -year storm Adjusted CN Practice 9.a. Sheetflow too Conservation Area with A/B Soils (Spec Impervious: 135 5.60 #2) 75 69 69 Turf 2.93 0 #N/A #N/A (Pervious): D.A. C CN 0 Total Impervious Cover Treated (acres) 1.7 Total Turf Area Treateid (acres) 2.93 Total TP Load Reduction Achieved in D.A, A (lb/yr) 3.84 Total TN Load Reduction Achieved in D.A. A ((b/ r) 27:4 Channel and Flood Protection 1 4,681 Weighted CN 1 -year storm Adjusted CN 2 -year storm Adjusted CN 10 -year storm Adjusted CN Target. Rainfall Event (in) 3.50 3.70 5.60 D.A. A CN 75 69 69 71 D.A. 8 CN 0 #N/A #N/A 1#N/A D.A. C CN 0 #N/A #N/A #N/A D.A. 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I .. it fI I , k t 5. , t` \ .`\\ \ +.+\. r'J .'// .// / / r \ `\\ , , r I rI r r \I 1� \ \\`\\ t�5 `j Jit Q!A! / r ` r^, F1 / ,! f! A i / sJ __ --- -�� J l i r7 �i ! I , rr .t I . !' ! t\ \\ . t\ \ \ \ \` \ POST-DEVELOPMENT DRAINAGE AREAS 100' 0 100' 200' 300' LIMITS OF VRRM ANALYSIS 150' 0 150' 300' 450' 'ftk 5 ,1 -605 SCALE: 1" = 100' -605 SCALE; 1" = 150' SCALE: 1"=100' SCALE: 1 "=150' SHEET 7 of 7