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HomeMy WebLinkAboutWPO201600071 Plan - VSMP Minor Amendment 3 2019-05-17GENERAL NOTES: DEVELOPER: NEW BELVEDERE, INC 610 WEST RIO ROAD CHARLOTTESVILLE, VA 22901 OWNER: TMP 062A3-00-00-00100 TMP 06100-00-00-16000 DB 4966, PG 372 DB 4966, PG 361 BELVEDERE LAND HOLDING LLC NEW BELVEDERE INC 610 WEST RIO ROAD 610 WEST RIO ROAD CHARLOTTESVILLE, VA 22901 CHARLOTTESVILLE, VA 22901 TMP 06200-00-00-002A1 DB 4966, PG 372 NEW BELVEDERE INC 610 WEST RIO ROAD CHARLOTTESVILLE, VA 22901 ENGINEER: COLLINS ENGINEERING 200 GARRETT STREET, SUITE K CHARLOTTESVILLE, VA 22902 CONTACT: SCOTT COLLINS, PE 434, 293.3719 TAX PARCEL #: 06100-00-00-16000,062A3-00-00-00100 & 06200-00-00-002A1 TOTAL ACREAGE: 06100-00-00-16000(PORTION): 4.76 AC. 062A3-00-00-00100(PORTION): 2.29 AC. 06200-00-00-002Al (PORTION: 1.00 AC. TOTAL: 8.05 AC. ZONING: NMD PER ZMA# 2004-07 W/ BELVEDERE COD APPROVAL ON JANUARY 5, 2010 (ACCOMPANIED BY ALL APPROVED VARIATION REQUESTS, WITH THE LAST VARIATION APPROVAL, VARIATION #55, DATED 11-07-2018). NOTE: THIS FINAL ROAD PLAN INCLUDES PORTIONS OF BLOCKS 4 AND 7 FROM THE APPROVED REZONING PLAN, ANY REMAINING PORTIONS SHALL BE PLATTED WITH PHASE IIC. PROPOSED USE: 32 SINGLE FAMILY DETACHED LOTS AND CARRIAGE UNITS DEVELOPMENT DENSITY: PER APPROVED REZONING CODE OF DEVELOPMENT BLOCK REMAINING ALLOWABLE LOTS PROPOSED LOTS ALLOWABLE CARRIAGE UNITS 4 20 20 13-17 UNITS 7 7 7 0-12 UNITS 9 5 5 0 UNITS 32 LOTS 32 LOTS 13-29 UNITS PARKING: FOR BLOCKS 4 & 7 - PARKING ON LOTS AVAILABLE IN GARAGES AND DRIVEWAYS SHALL BE ACCESSED VIA ALLEYS, DRIVEWAYS FROM FARROW DRIVE SHALL BE PROVIDED FOR THE LOTS WITHIN BLOCK 9. ON -STREET PARKING IS AVAILABLE AS SHOWN ON THIS SHEET. SOURCE OF BOUNDARY SURVEY: ROUDABUSH, GALE &ASSOCIATES 2016 ACSM LAND TITLE SURVEY OF BELVEDERE STATION LAND TRUST LLC SOURCE OF TOPOGRAPHY: VIRGINIA RESOURCE MAPPING AERIAL SURVEY DATED JANUARY 2016 DATUM: ELEVATIONS BASED ON NAD'83. FLOODPLAIN INFORMATION: THIS PROPERTY IS LOCATED OUTSIDE OF THE FLOODPLAIN LIMITS AS SHOWN ON THE FLOOD INSURANCE RATE MAP, MAP NUMBER 51003CO279D, EFFECTIVE DATE FEBRUARY 4, 2005. STREAM BUFFERS: THERE ARE NO STREAM BUFFERS WITHIN THE LIMITS OF THE PROJECT AREA WATERSHED: SOUTH FORK RIVANNA RIVER WATERSHED. THIS PROPERTY IS NOT LOCATED IN A WATER SUPPLY PROTECTION AREA. EXISTING VEGETATION: CLEARED, SLOPING PARCEL WITH GRASS COVER STREET TREES: STREET TREES TO BE PROVIDED ALONG PUBLIC ROADS IN ACCORDANCE WITH THE CODE OF DEVELOPMENT AND COUNTY REQUIREMENTS. STREET TREES SHALL BE A MINIMUM OF 2-1/2 CALIPER. ACCESS: THIS DEVELOPMENT WILL ACCESS EXISTING PUBIC ROADS LOCATED TO THE WEST VIA PUBLIC ROADS AND PRIVATE ALLEYWAYS, INCLUDING BELVEDERE DRIVE AND FARROW DRIVE. CURB AND GUTTER AND STORM SEWER SYSTEMS WILL CONVEY DRAINAGE WITHIN THIS DEVELOPMENT. ALL PROPOSED ROADS SHALL BE PUBLIC. PHASING: THIS PROJECT SHALL BE CONSTRUCTED IN (2) PHASES BUILDING SITES: LOTS 197 TO 228 EACH CONTAIN A BUILDING SITE THAT COMPLIES WITH SECTION 4.2.1 OF THE ALBEMARLE COUNTY ZONING ORDINANCE. IN ADDITION, THE RESIDUE OF PARCELS TMP 62A3-1, 62-2A1, & 61-160 ALL CONTAIN A BUILDING SITE WHICH COMPLIES WITH THE ALBEMARLE COUNTY ZONING ORDINANCE AND BELVEDERE CODE OF DEVELOPMENT. CONSERVATION PLAN: A CONSERVATION PLAN SHALL BE REQUIRED WITH FINAL ROAD PLANS. CEMETERIES: NO BURIAL SITES WERE FOUND DURING FIELD SURVEY OF THE SITE, IMPERVIOUS AREAS: ROADS & ALLEYS: 3.06 AC. SIDEWALKS: 0.54 AC, LOT BUILDABLE AREA: 3.23 AC. TOTAL 6.83 AC. ACREAGES: LOTS: 4.51 AC. R/W: 2.99 AC. OPEN SPACE: 0.49 AC. NOTES: 1. A 6' MAINTENANCE EASEMENT SHALL BE REQUIRED ON ALL PROPERTIES ADJACENT TO PROPERTIES WITH SIDE YARD SETBACKS LESS THAN 4'-11", THESE EASEMENTS SHALL BE SHOWN ON THE FINAL SUBDIVISION PLAT. 2. THERE ARE MANAGED STEEP SLOPES ON THIS PORTION OF THE BELVEDERE PROPERTY, AS SHOWN ON THE PLANS. 3. TRASH SHALL BE ACCOMMODATED WITH INDIVIDUAL TRASH CONTAINERS FOR EACH LOT. GREEN SPACE/ OPEN SPACE PROPOSED: CONSERVATION AREA(AC) PRESERVATION AREA(AC) OPEN SPACE(AC) TOTAL GREEN SPACE (AC) BLOCK 4: 0 0 0.22 0.22 BLOCK 7: 0 0 0.00 0.00 BLOCK 9: 0 0.22 0.05 0.27 TOTAL 0.0 0.22 0.27 0.49 NOTE: ALL OPEN SPACE TO BE OWNED AND MAINTAINED BY THE BELVEDERE HOMEOWNERS ASSOCIATION. W)ELVEDERE PHASE IIB VSMP PLAN AMENDMENT 3 (AMENDMENT TO WP0201600071) RIO MAGISTERIAL DISTRICT ALBEMARLE COUNTY, VIRGINIA SHEET LAYOUT SCALE: 1" = 100' r®� EXIS77NG CULVERT EAR7H DITCH CULVERT DRIVEWAY CULVERT DROP INLET & S7RUC7URE NO BENCH MARK CURB CLEARING LIMITS CURB &GUTTER PROPOSED PAVEMENT- VDOT STANDARD STOP SIGN EC-3A DITCH EVS71NG CONTOUR DEPTH OF EC-3A DITCH PROPOSED CONTOUR 8" 20o - EC-2 DITCH 240.55 PROPOSED SPOT ELEVA77ON [ �• DEPTH OF EC-2 DITCH T/B DEN07ES TOP OF BOX 78C DEN07ES TOPfBACK OF CURB LEGEND EROSION CON TROL HANDBOOK SP EROSCI A77ON NUMB & SEDIMENT ER S7RA W BAIL BARRIER 3.04 DD D V TEMPORARY DIVERSION DIKE 3.09 ST oo ♦ TEMPORARY SEDIMENT TRAP 3.13 SBQED>SEDIMENT BASIN 3.14 IP INLET PROTECTION J.07 SFx SIL T FENCE 3.05 CE D CONSTRUC77ON ENTRANCE J. 02 CD `► CHECK DAM 3.20 TEMPORARY FILL DIVERSION 3.10 DV DIVERSION 3.12 PS PS PERMANENT SEEDING 3.32 TO TO TOPSOILING 3.30 CIP CULVERT INLET PR07EC77ON 3.08 DC DC DUST CONTROL 3.39 TSD TEMPORARY SLOPE DRAIN 3.15 SA SAFETY FENCE 3.01 TEMPORARY RIGHT -OF -WA Y 3.11 DIVERSION SURFACE ROUGHENING J. 29 BkJ SOIL STABILIZATION J. 36 F_ __ _7 _77 BLANKETS & MA T77NG Sheet List Table Sheet Number Sheet Title 1 COVER 2 PHASE II EROS ION & SEDIMENT CONTROL PLAN -FINAL GRADING PLAN 3 STORMWATER MANAGEMENT PLAN VSMP PLAN AMENDMENT PROPOSED CHANGES: A1 REMOVAL OF SEDIMENT TRAP #3 AND RE -GRADING OF AREA FOR PERMANENT STABILIZATION. REVISED STORMWATER MANAGEMENT PLAN APPROVED by the Aibemarle County Community Development Department Date S / i.;� / -?- 0i y File wy Pc ,, c=i ja-i d - - ,f�i"/�j�'i'1a�ilPf1L_� TH �SCOTT 'R. COLLINS�4 U Lie. No. 035791,ki.. sirONAL w w z z w 0 z J O 0 c Q) 93%MO VI v� r i rl 0 U Z U 3 0 � p J ~ P P (n Q ce z w w v 0 0 O 0 a ® z d � � F N w Z O© 0 m U/ eie cc U tJ C � N fl ii Gti' 4 N U0 w �� sw3. Uj N 15 w s.0 LU w W ce o U 0 dn 0 Z: Ln Z: -t- ­1 L N U a .g 0 c LU� N z � ca y � U C L Cy) a� �. LU a smom a C w cr) C UNJ 0 as Uj a c o BRUMM a cz ' c L0 9 1 2: ce- a 0 LL1 0 UU v o a L w a X) LLJ F__1 0 y, Ul Z) LU a E �- U I 0 z Er ZLLJ w w z z z w U) z o J� iU cy. a Uj a_ P CL a� 0 c r+r C%4 as Uj s 0 Uj E a i U) c) U -0 JOB NO. 0 152121 Q V) N -� SCALE �q AS SHOWN 4 GI C O Q SHEET NO. a 0 s | ( � | / | \ | | | � � | r � � | _--_ ---- 8COTT~R. COCLIBGZ Uu SPILI v'!1AY CREST— - DA M �10P Of- [JANSON CONCRETE--111 ELEVA',T­,`ON= 4162,5 ANTI-VORTEI TRA-5,qRACK OUTFALL C�IANNEL. I/V/ 1Z 0:1 SIDE aop�ps 56" RCP URULT-STAGE RISER. FOUR-- )4" LOW -FLOW ORiFICES AT L 'LAt 1/� STEEL WEIR PLATE TO B 411,0', MID- 1-1 O�y FASTENED OVER THE 24" URII-ICEE�3 AT ELEV=414.0' & RISER OUTLET OPENING, TOP ELEV. A 7- 415,5' 1 (9' A QUA 77C B,1-7,101 COVERING V-3/16" OF THE SEE BELVEDERE PHASE 2A ROAD PLANS OUTLET OPENING. SEAL ILAN S OPENINGS AROUND THE (SUB2012-0152 AND SUB2018-0106) FOR PLATE WITH MORTAR TO THE AQUATIC PLANTINGS IN THE POND CREATE A WATER -TIGHT Ui'ASkl RACKS S111ILL 3E PLATE OVER THE OPENING. INSTALLED CA! ALI INSTALL STEPS IN EX. RISE iER]FICES IN ACCORDANCE STRUCTURE IF THE STEPS v/ THE APPROVED .24 C1. III RCP PARREL iL TAILS, OR EQUIVAILENT MEW PLATE; SET-- DETAIL 77-1/S SNEET USLY DE HAVE NOT PREVIC BEEN INSTALLED. 100 LF 9 0, 56,1, BOTTOM ELFV.=405.32 /N V IN= 404.50 1104.00' INV OUT- - 6 RISER STRUCTURE 1701') T7 G­1 CONTRACTOR SHALL PLUG ONE OF THE FOUR EXISTING 06" MID -FLOW ORIFICES (INVERT ELEVATIONS OF �414�00) AND INSTALL A STEEL WEIR �PLATE COVERING THE TOP V-3/16" 0 D T ,_pJL7,S'J![J [17 THE EXISTING 24" BARREL'S OUTLET PIPE _PWINC A. Y IK77� 24" RCP �OUTLET­SEE DETAIL, THIS SHEET '0.82' EL.=404.50 (JAiCIT TO SCA7,TF---- ----------- 2 YEAR-­-­�, V.' S. E, ---I � =' , UL4,34 WEIR PLATE DETAIL N�T.S. 10 '71EA T? ­10' �FL')E TOP OF DAA4 6. n�� HIANSON 27 EII.= 41aO 1 CONCRETE I—KICIR ELEV.� 4-16,25' Y00 )1EA/?--1 I A NTI - VOR TEX �TRAQRACA, CYJ?_914:L. I RIPRAP LI ��417.00 k1, ', , VA L k N 1. J ------------ -C OUIFALL C-fiANNE-1- r-5' WIDE F )F`EBAY FOP 3,1�1 SIDE SLOPES) OF OAAW ELEII.�- 410 I NW'\ J --MAX EMB&vWMENT -- 7' OF NT=14' (418-4041) 3, E. 10' AQUATIC BENCH PONDING BOTTOM r)F--- D rEP TH FORE311 Y EL E V. 0/?1F COETF 0� 6 ....... . . . . . . . MIN� 8' ViIDE @ TGP & 13' j6" RCP kVJL7---S7AGE RISER, FOUR— DEEP 1h4PERVJQUS CORE & WIDE FORESAY DAINI & io'WIDE FORESAY—i" 04" LOel-FLOVI ORIF7(ES AT EILEV 2.4 CL. I// RCP BARREL CLIT-O'FF TRENCH V11FH 1:1 411.0 06' lIVID-FLOW �ffff? PLAIL, SfE DETAIL SIDE SLOPES, SEE DET&L ON SPILLWAY SHALL BE CONSTRUCTED 0 L-30 TTCA, OF-- , G0�3 106) LF 0 0,50% C�HEET I I OF THE FINAL Sl-�-- GABION BASKETS WITH VDOT #3 COARSE RE TEN 770N OPIFICES AT E101=414�0' & RISER INV IN= 404�50 PLANS FOR ADDITIONAL AGGREGATE. GEOTEXTILE FILTER FABRIC BASIN= TOP E-LEV. AT 415.5' INV 404.00' IINFORh,�ATION� UNDERLIAYNIENT SHALL BE INSTALLED. 4015. 010 WEIR CREST ELEV.=.4o9.00' .-RITIT-lb"N IC)N (NOT TO SCALE) YARD DRAIN DRAINAGE DESCRIPTIONS PIPE INFORMATION I NLET I NFORMATI ON STIR. NO. DIA. (in.) LENGTH* (ft.) SLOPE (%) INVERT IN INVERT OUT MATERIAL INLET TYPE RIM* ELEVATION COMMENTS YD-A 12" Nyloplast Cleanout 470.00 Solid Cap/Cover Req'd YA-A - YD-B 6 90.40 8.85% 468.50 460.50 HDI-E YD-13 12" Nyloplast Yard D'ain Inlet 462.00 Dome grate cover Req'd YA-B - YD-C 6 11110 6.19% 460.50 453.50 HDPE YD-C 1 12" NyloplastYard Drain Inlet 455.00 Dome grate cover Req'd YD-D - EXII 110.30 7.25% 453.50 445.50 HDPE I Approved WPO 201200096 Approved WPO 201600071 Post- Development Drainage Proposed Post- Development Proposed Post- Deve lo pment Area 1A Drainage Area 1A Drainage Area 1A *Area, ac. CN Area, ac. I I �. --, ­ ­ ImperviousAreas 8.92 98 9.18 98 9,52 98 'Impervious' Grass (Factor of Safety) 0.76 98 0.50 98 0.17 98 Grass/Lawns 1 8,76 61 11 9.26 1 61 9.59 1 61 > P -DEVELOPMENT RE 4; 1� SCENARIO: bj� 482, ­ioo' SCALE 3." 502- 9el" A- E A X S FOR THE NEWLY ADDED 3.o TOWNHOUSE zt I OT �6,Y LM o --q _7 "f,­ 4 _a-- 6S LOTS NORTH OF FOWLER STREET. 0 LIJ th� LV LoT �OT- THIS VSMP PLAN AMENDMENT #3 ACCOUNTS FOR THE NEWLY ADDED 0.34 ac. OF RUNOFF 0 R ,if 077 L 46 492 10 YEAR Ul F V'I" WSE=416.J4 -1' 100 �EAR V) W&E.=41zoo TOP OF DAM UJ WD774= 10' AT AN T ? W OTS UNDER ELEVATION= 418' 0 12! 71:,�P AR E REVIEW U A 1A 1.00' OF CL It' vwwk, -4- 49? �A, FREEBOARD "H 16T DURING THE 100-'YR -J 0 A STORM 4 7 H, C711 LLI 82 EVEWT D PHAialA ­...,, I " 11", Ce 1�v rLY UNDER LOT 2G3 0 -�ONSTRUCTION OPEN'�PACE7�, v5 AC. �I;A )T -7 1, A WIR COEFF J. 3 CIE �-A CL Lai 202 4 c LO ar VDOT CLASS I RIPRAP GENCY SPILL WA Y SPILL WA Y 141 TH FIL 7ER FA C (D A, L X i' TOP ELEV= 416.25 LO L' OT 15, UNDERLAYMENT DEPT7H-1= + X CD FMERGENCYSPHJWAY ��­­ . .................. Lou 0 RELATIVELYTHE SAMEWITH ONLY MINOR SHIFTS. THE FACILITYWASALSO DESIGNED FOR4o FUTURE LOTS. OPENSPACE Gen-'eral �onstruction notes for Stormwater 1- J LOT x),S UJ J­ Management Plans PHASE IIB INCLUDES 25 LOTS AND THE FUTURE LOTS SOUTH OF FOWLER STREET NOW TOTAL 22 LOTS. THE LO r 194 1. All dams and constructed fill to be within 95% RESULT 15 A SLIGHT OVERAGE IN LOT IMPERVIOUS AREA FOR 7 FUTURE ATTACHED TOWNHOUSE UNITS 472 74 of maximum dry density and 2% of optimum LOT ilL 5 UJ 4 200 sf. HOWEVER THE FACILITY WAS OVER-DESIGNE D BECAUSE THE APPROVED -------- ROUGHLY EQUIVALENT TO:L2 moisture content. All fill material to be approved L OT 1�d It CL IMPERVIOUS COVER COMPUTATION ACCOUNTED FOR 33,162 sf OF'IMPERVIOUS'GRASS. THE GRASSIMPERVIOUS"111 LOT al�/ . . .... by a geotechnical engineer. A geotechnical 4W COVER IS A SAFETY FACTOR THAT IS NOT INDUSTRY STANDARD OR REQUIRED. As A RESULT THE PROPOSED engineer is to be present during construction of 108 NO. 464 J dams. EDIMENTBASIN WILL BE E XISTIN S 2. Pipe and riser joints are to be watertight within 0 -A TYPE IJIRET�NTII CONVERTED 70 MR 7 DN BASIN ONCE' ­1 LOT J --------------------------- -------- 7 1­11 s" D is sTA.51LizEb-SEE THI stormwater management facilities. IMPERVIOUS AREA REQUIREMENT AND IS STILL CO I , F PHASE IIB & FUTURE 22 LOTS WITHIN THE APPROVED FACILITY's WATERSHED REMAINS BELOW THE APPROVED 152121 MPLIANT. OT "J53 LG ITS WATER SHEETTOR S -C- -1 -A OAC' 3 CALE 1�11-! VAIUMLI ,�j3,irl- 0 - -- �!�' 363� 5�'IWMVIOUS AREA r-EE9,11,TdL$���LARCE ..... PE AILS For temporary sediment traps or basins which gr2 S? TH REFORE No FURTHER D .0J?TIJ P,,F MER r T!J E. W R MEM are to be converted to permanent stormwater 1 =100' ESIGN V) place until the site is stabilized, and permission SHEET NO. management facilities; conversion is not to take . ... ....... REQUIREMENTS ARE NEEDED FORTHIS SUBAREA'sWATER QUALITYAND QUANTITY ANALYSIS. THE END RESULT IS THIS DEVELOPMENT AND THE FUTURE DEVELOPMENT OF 22 LOTS SOUTH OF FOWLER STREET,��� has been obtained from the County erosion REMAIN IN COMPLIANCE WITH THE APPROVED SWM DESIGN. control inspector. 3 TH SCOTT R. COLTTNSZ Lic. No. 035791 11�1 \-N, -DRAINS INTO 4-94 1QUAL n KOPOS LU LU Z U, 4 b" HLJ UlNDER �N C5 ­­�-Z: --- ---- - ----- .. ..... . . . N k -TYP. MA LIPA I I APPROXI -I r --1 Ur- K V" 'r . ......... SEDIMENT BASIN 'Z D- #�LA'�'AS BUtLT­5U BA&�A Z Z 9 oe­ -J 0 �o, i-J 1/ 77 0 777 All X + Q) iAj 77­­ 7- - ----- 4Bb 0 APPROXIMATE -LIMITS 484 - -- ----- DA-#J 14)1, f14 f14 TEMP. SEDIMEN ­(c :6RREf�TWATEJ<5tJ'F[5` ,T,E INS (D #2's ASBUILT SUBAREA rp:� -7- ="H 0 LLJ UJ ul J�, +) 7f' LU 0 Lij A U. U, P P P X m-.a lu, R 77`7 71 6-c4 C� UJ UJ UJ U Z Z Z 0 ---- -- V 7�7 V) v­l 41 LU UJ 0 LU Wi Z -T- 7'lr U U U (D I it 7 0 0 0 0 J JA :L 46-&-­ ...... "A > LU 0 0 0 Q u U 464�' CC 21- CO uJ UJ W Q: 0� 0 0 A— 4, LOTt6JJ I F OT JRR9Nf WATERSHED) 7 LU U.J LLI P LO P0 D > > > v LU UJ LU r )ER RAI Q� Q� A % 0 84- Area CW J EX Ed (Acres) (Mi 7, LOT i7� 42? - --- -- SYSTE INT Afi, cc Structure 48 L ­ < W f 4947 V Y'A,&9 'i YD-A 0.03 0.50 5.0 YD B 0.13 0,50 5,0 47 61, LOT16 ;`4 "X"A o YD-C 0.14 0.50 5.0 Z . ..... I 0T­ V" LOT i 69t PROPOSED MODIFICATIONS OT TO THE RETENTION BASIN: L Z Z �?Z W k, IR ': , 6 A Z LOT IF6 F4 ING'TEMP LQ1 1 51' 4% �4. J hL 1111 v- 0 6V JIM 1111 47?- LOT opal' -go I zl ,W1 7, LOT nTil,' n 4W LOT-�J % '464 W k- M LOT it$6 Ilk L01 2� A5 � IJW T A w Y !4 M, 1111&;- M, 141, 1 61- ........ ....... SCENARIO: Z/ 482- UY, 09 SCALE i"­aod dt I J!, ... ... Am . ...... . 7 7. > 4-9411, LOT39 LOI _4 L -4Z 77 ----------- LOT 43- LOT 47 NDE LOT LOT 41LITURE LOTS 4 k� f 7,— 'Z 3, %Q --4 Z X 11 'M \% '40 + J-4 1p. v v N" SW-M FAOILI., IsTIN % 4SE> Y" 484 L A 1113,3HE SUBAREA INCt jDESP HAS'�S I L 'LER E Total 18.44 80.4 18-94 79.9 19.28 79.6 4-- ;i,,- ­­ I I ll A �,­ -SOUTH OF F l2 [, ` --t ­­ ­­r�,: 11-1-1-1- ­­....- ­­­-­ -.--7= ­1 1 TURE-LOTS . . .... . . . . . . E LOTS UN - "'Fu &THEF1JTURELOTS­N6RT 'bF F L R' Values based on Approved WPO 201200096, sheet 5 4- MAOA`r� SHEET- tEETHE-SWM If INA IVE T S"' k-e - -------- U )RMATIO -r 11 -aACCOUNTS H, THISVSMPPLA AME DMENT# LLJ a) Approved VVP0 201200096 Approved VVr0 201600011 roposed Post- Deve I opment Post- Development Drainage Proposed Post- Development Drainage Area 1A 2 year flow, cfs 3.92 3.75 3,82 22.68 22.79 22.58 10 year flow, CfS r Of Freeboard in 10( tTO OFFSET THE MINOR INCREASE IN RUNOFF BEING SENT TO THE APPROVED RETENTION BASIN, THE CONTRACTOR SHALL SEAL ONE OF THE FOUR 06" MID -FLOW ORIFICES WATERTIGHT, ARMOR THE J-)i EMERGENCY SPILLWAYWITH VDOT CL. I RIPRAP AND INSTALLA STEEL WEIR PLATE ON THE BARREL's OUTLET. SEE'PROPOSED MODIFICATIONS TO THE RETENTION BASIN'DETAIL ON THIS SHEET. STORMWATER MANAGEMENT NARRATIVE: OVERVIEW: THE PROPOSED BELVEDERE PHASE 1113 AND THE FUTURE LOTS SOUTH OF FOWLER STREET WERE ENVISIONED D U RI IN G TH E DESIG N & APPROVAL 0 F B ELVE DERE PHASE I IA (WPO 202200o96). TH E PHASE I IA APPROVED TYPE I I I RETENTION BASIN 15 DESIGNED TO PROVIDE WATER QUALITY AND QUANTITY TREATMENT FOR ALL OF PHASE 1113 AND THE FUTURE LOTS (PROPOSED UNDER A SEPARATE PLAN). WATER QUALITY/ QUANTITY SUMMARY: THE FACILITY WAS DESIGNED & APPROVED FOR ALL OF PHASE 1113's ROAD/ALLEY NETWORK AND THE FUTURE LOTS SOUTH OF FOWLER STREET (UNDER SEPARATE REVIEW). THE PROPOSED PHASE 1113 ROAD NETWORK IS