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HomeMy WebLinkAboutWPO201700037 Plan - VSMP 2022-06-22BROOKHILL ITY MAP: �i�ah�tai:�►l��`tiyYslC� OWNERS: TM P 04600-oo-oo-o29B3 CROCKETT CORPORATION 435 PARK STREET CHARLOTTESVILLE, VA 22901 DEVELOPER: RIVERBEND DEVELOPMENT, INC. 455 SECOND STREET SE, SUITE 400 CHARLOTTESVILLE,VA 22903 ENGINEER: COLLINS ENGINEERING zoo GARRETT ST, SUITE K CHARLOTTESVILLE,VA 22902 TAX MAP: 04600-00-00-02963 D.B. 5022, PG.17o 39.98 ACRES ZONING: NEIGHBORHOOD MODEL DEVELOPMENT DISTRICT (ZMA2o18000i2WITH PROFFERS -APPROVED BY THE BOARD OF SUPERVISORS ON JULY 1.7,2019) -THE CODE OF DEVELOPMENT AND APPLICATION PLAN FROM ZMA202S00007 ARE STILL VALID AND STILL APPLY TO THE BROOKHILL PROJECT. ENTRANCE CORRIDOR OVERLAY (EC), AIRPORT IMPACT OVERLAY (AIA), MANAGED AND PRESERVED SLOPES OVERLAY DISTRICT, AND FH-FLOOD HAZARD OVERLAY ZONING DISTRICT NOTE: A SPECIAL USE PERMIT APPLICATION (SP2025-00025) WAS APPROVED TO ALLOW THE GRADING ACTIVITIES IN THE FLOOD HAZARD OVERLAY DISTRICT (FH). THE SP WAS APPROVED ON NOVEMBER 9, 2oi6 BY THE BOS WITH CONDITIONS. TOTAL PROJECT AREA: TOWN CENTER 39.98AC PROPOSED USE: VSMP PLAN FOR THE VILLAGE CENTER BLOCK CLASSIFICATION: VILLAGE CENTER: NEIGHBORHOOD SERVICE CENTER AND URBAN DENSITY ALLOWABLE DENSITY: 51 UNITS (MINIMUM) To 254 UNITS (MAXIMUM) - 2 DUATO 6 DUA FOR THE PARCEL BASED ON 25.8AC WATERSHED: THE PROPERTY IS LOCATED WITHIN THE NON -WATER SUPPLY WATERSHED AREA OFTHE SOUTH FORK RIVANNA RIVER AGRICULTURAL/FORESTAL DISTRICT: NONE TOPOGRAPHY & SURVEY: TOPOGRAPHY WAS COMPILED FROM SURVEY BY LINCOLN SURVEYING AND BELL LAND SURVEYS, JANUARY 2015. BOUNDARY INFORMATION WAS COMPILED BY LINCOLN SURVEYING ON MARCH 7, 2025. FIELD VERIFIED BY COLLINS ENGINEERING, APRIL 2022. DATUM: NAVD 1988 EXISTING VEGETATION: THE PRE CONSTRUCTION GROUNDCOVER WAS A MIXTURE OF GRASS AND WOODS. CURRENTLY THE AREA IS AN ACTIVE CONSTRUCTION SITE AND THE LANDCOVER IS NOW A MIXTURE OF GRASS, WOODS AND EXPOSED EARTH. ARCHER AVENUE, BLOCK SAND APPROVED WET POND 4 HAVE BEEN CLEARED & ARE CURRENTLY UNDER CONSTRUCTION. BURIAL SITES: NO CEMETERIES WERE FOUND DURING FIELD INVESTIGATION OF THIS SECTION OF THE DEVELOPMENT. PRESERVED/MANAGED SLOPES: PRESERVED SLOPES AND MANAGED SLOPES ARE SHOWN WITHIN THE LIMITS OFTHE PROPERTY. SEE APPROVED EXISTING CONDITIONS PLAN SHEETAND THE ESC SHEETS. FLOODPLAIN: THERE IS A ioo-YR FLOODPLAIN LOCATED IN THE BROOKHILL DEVELOPMENT PER FEMA MAP ID i0o Co28oD DATED FEBRUARY 200 . IN ADDITION A DAM BREACH INUNDATION ZONE EXISTS 5 3 4, 5 , IN THE BROOKHILL DEVELOPMENT FOR THE SOUTH RIVANNA DAM, WHICH IS A FEDERAL DAM LOCATED UPSTREAM OF THE PROPERTY. THE APPROVED FDP PERMIT # IS 2oi6000O4. RETAINING WALLS: NO RETAINING WALLS ARE PROPOSED WITH THIS PLAN, THOUGH THEY ARE SHOWN GRAPHICALLY. THE FINAL SITE PLAN FOR THE VILLAGE CENTER, WHICH IS SEPARATE FROM THIS PLAN, WILL INCLUDE THE RETAINING WALLS' DESIGNS. UTILITIES: NO UTILITIES ARE PROPOSED WITH THIS PLAN, THOUGH THEY ARE SHOWN GRAPHICALLY. THE FINAL SITE PLAN FOR THE VILLAGE CENTER WHICH IS SEPARATE FROM THIS PLAN WILL INCLUDE THE UTILITIES' DESIGNS. THE UTILITIES WILL BE REVIEWED UNDER A SEPARATE PLAN AND WILL RECEIVE ALBEMARLE COUNTY WATER AND SEWER AUTHORITY APPROVAL. SUMMARY OF VSMP AMENDMENT #4 MODIFICATIONS 1. THE LEVEL II WET POND APPROVED WITH VSMP PLAN AMENDMENT #2 HAS BEEN REPLACED WITH AN UNDERGROUND DETENTION SYSTEM (PROVIDING STORMWATER QUANTITY TREATMENT) AND A LEVEL SPREADER WITH A DOWNSTREAM VEGETATED FILTER STRIP (PROVIDING STORMWATER QUALITY TREATMENT). 2. SHEETS 12A-12H HAVE BEEN ADDED SHOWING THE FINAL EROSION & SEDIMENT CONTROL PHASES III & IV NOW THAT THE VILLAGE CENTER's LAYOUT HAS BEEN FINALIZED & IS UNDER REVIEW. SECTION 1 MASS GRADING VSMP PLAN AMENDMENT #4 (WP0201700037) RIVANNA MAGISTERIAL DISTRICT ALBEMARLE COUNTY, VIRGINIA o — — V \ BOIL r _ __ V'v v \ _ 0, I \ II II V A\\I JI ✓,/ *m/mi PROPOSED4-STORY HOTEL,120 BEDROOM UNITS a5,200 SFFO OTPRINT)60,so0SP� \ \, I r ---' ✓I ,��i.°-- - -- --�� � V l`®\ � VA�1 V` -- �- IXLu III Q PROPOSED O'I I x O 0 1STORVO 0=\•`\ J I I i I 1 I $I I I I I I (IIII III Q (UUUIII ' COMMERCIAL o J I I\` RETAIL/ J �i, RESTAURANT f I I I 851DN 005E sieBL uuDlN66G x/ OPOSE- PROPOSED AARTMENT LS701STORV —COM03OFFICE PROPOSED COMMERCIAL UNIrs) BUILDING 1STORV RESTAURANTa5 60,0005E COMMERCIAL BUILDING iI / 1 - > RETAIL/ 13,5005E _ _ RESTAURANT BUILDING 10,0009F — — / � -- E--i � _�__� � __IIIIIIIII�IIIIIII��II��III J L \'-\- 1 sr�U-- , - BLOCKIB\\\ \\\ BUONT PROPOSEJ L0.5TOO"' BLOKC ORv8uN A \ '— ��L1I1ji1FSF v Q RBUILDING % --- 9F �AVA� BUILDING --- 10,000 SF \ VA e PROPOSED 2-STORY II IIII b O FITNESS CENTER 0(112'x134' \ \\\ \ 1 \1�\l/ I ®� I `I PROPOSED COMMERCIALISTORY I\ �1( / I - RETAIL/ ESTAURANT BUILDING El - \ I IIIIIII �' III I III IIIIIIIu \\\ / J JI,�® PRO10 COMMUNITY P001 II III IIII IIII II III 11 l / / /l/ \ T it f I fNIi51R�IN[�i � _ "' -. _ �APTbtEWi e41 J r I. I fn� CENTER PROPOSED LAYOUT SCALE 111=100' I \ 10 382 I �II°80/ ®0 s PpL0(3 pUNS EROSION CONTROL 11 EROSION & SEDIMENT 1ROL HANDBOOK SPECIFICA77ON NUMBER CE CONSTRUCTION ENTRANCE 3.02 CR CR CONSTRUCTION ROAD 3.03 STABILIZATION SF x K x SILT FENCE 3.05 ST SEDIMENT TRAP 3.13 SB SEDIMENT BASIN 3.14 OP OUTLET PROTECT70N 3.18 RR RIPRAP 3.19 CD ' CHECK DAM 3.20 TS TS TEMPORARY SEEDING 3.31 PS PS PERMANENT SEEDING 3.32 OTREE PR07ECT70N 3.38 DC DC DUST CONTROL 3.39 Lic. No. 035791 4� 5/31/22 #� z O � a Z If) Lu DO � O Z Z O _1 ¢ U H z ,w V/ L w W APPROVALS DATE DEPARTMENT OF COMMUNITY DEVELOPMENT PLANNER/ZONING ENGINEER INSPECTIONS ARB DEPARTMENT OF FIRE RESCUE ALBEMARLE COUNTY SERVICE AUTHORITY VIRGINIADEPARMENT OF TRANSPORTATION HEALTH DEPARTMENT L9 z w w z L9 w II J J ti M M co N 0 0) N w J J U) Lu — O U Y F_ D Lu LLI LL 0 W orf L.1.. 0 0 O N zw O0 U w V / i O O 0� co LL F- F- r LIU JOB NO. 182150 SCALE AS SHOWN SHEET NO. 1 'x PROPOSED' •. ' IIT BACKING \ \ �TH QF� o I / r v v \\ v `�� % / � � � � , I � � SCOTT R. LLINS!Z i U CONTRACTOR SHALL WRAP BUILDING I I �^ / / PROP,OSEfyTREq PROTECTION I� �' Q N SILT FENCE AS SHOWN I / ALONG LIE INSTALLED MITS n \ U Lic. No. 035791,a FENCING TO LINE TO PROTECT PROPOSED TP o A��� `� \ \ / I TYPICAh. SEE ESC PHASE III SEQUENCE I I / �F DISTURBANCE Q A \ \ 0n 5/31/22 �4 / MITS 0 DISTU OF CONSTRUCTION FOR TIMING. / J / Of Z / THE LIN� \A \ ���ss �yG1 z �/ _ I --- /A� ZONAL E w J x-x-x-x-x--x-x-x-x- x-x-x-x-x-x-x-x-x-x x-x- - (J/ S — / / / N I I \ MATCHLINE, SEE SHEET 12D \ \ ��I m I I� I I �/ I I I I`� I I Ii �I I I I I� I I 1 `\ � I I� I I A� I I I I �� \\ \\ \\ � J / V A\ \ V x PROPOSED BLANKET/ a \ C \ ■ -MATTING, TYP. / g E / N CONTRACTOR TO OUTFACE PERMANENT ■ � / / � — — � � — — F / / � � � � � I � � / � / / � \ � \ � \�\ — � ? 3 YAf b DRAIN INLET INTO THE ■ SSF SF,/,�� 1 APPROVED SUMP VIA A TEMPORARY SS W W V 01" HDPE PIPE IN;ESC PHASE III. I : \ SSF F�SSF / ��S — / / / / \ \ \ z �/s \ i _SSF�SS / / / \ s U co S w m i 1 1 , • � S SF - �\ \ \ 1 \ Z � o YSUI.IP A OUAJQ 8TpRM INLET ' -I- PROPOSED E � \ VEp 11 E SEPIA TE SE EXPANDED o Q LIMITS OF - z 4 EXISTING STO I \ S�TO RE AiN I��€ C PHA I DISTURBANCE !- - - �� _ / A \ \ V A � �� z 3 U OFF ULLTIMATyE �Y D AjN�S A �- PROPOSED > z GREENWAY , STRUCTURES FROM PRO ED %Dl"��l���APPR(yt%ED WPO PLAN G \ �\ A TO REMAIN \�RM INt T V EXISTI G, APPROVED TYP. / \ o PROPOSE D VDOT CL. Al RIPRAP OP o A O'vCO� \S�PERT FENCE TO > y \\ Ny Y RUNOFF j\\ \ \ \ \O \ \ -- ►� OUTLET PROTECTION \ \ AA PRQV�Dk EXISTING A A A \ \ \ A (L=10',W=4',D=1.5') \ \ S )IMENIT BASIN #4 \ \\ \ \ \ \ \ \ \ \ O ` / Ce `o o .. ■■■. \ \ \ \ ISTING, APPROVED LIMITS OF -x-x-x-x-x-x-x-x-x-x-x-x-x- x-x-x-x-x-x-x� �� �, � A - �� \ \ 0� I I DISTURBANCE LINEVA CONTRACTOR TO DELAY x \f� \_ - 1 y CONTRA TOR TO THE INSTALLATION OF THE A!" CONNECT PROPOSED O/ COMMUNITY POOL's WATER I PERMANENT PIPE / / x / / o INTO EXISTING LATERAL UNTIL THE x I \ � \� \ \ I / / / ♦♦ ` STORM SEWER MH IN APPROVED SUMP IS \ \ N.. \ / / �7� \ ♦♦ x REMOVED IN ESC PHASE IV. x ,/ ` / I ESC PHASE III. x � P � _ l 0 LX X--x x=k- x-x-x-x-x-x- \ \ \ \ l / / // / — _ \\ •� ` I WETLANDS, / \ ° P. 1 ESC PHASE III SEDIMENT of x BASIN 4 DA=15.56 ac. P �5 I I I I / / / / / / / — — \ ■ I I I I __ (BASIN WAS SIZED & � � _ , � � I C X APPROVED FOR A LARGER I I I I / _ I I / �' \ DRAINAGE AREA. APPROVED � � � � � � I I � I I I � � �/ / _ � �`� ESC PHASE I DA=16.02 aC., AS SHOWN ON APPROVED x - SHEET 5 OF AMENDMENT #Z) I x F, BUOILDNG &OPOOL SIT SITES SILT i EfMAN�IT�REAIININGAWALL IN I I I ■ V A CV ESC SEQUENCE OF x I I I I I \ O FENCE, AS SHOWN, TYP04 ICAL. SEE I IESC PHASE �II I I I / \ \ N v CONSTRUCTION FOR TIMING. x M I I I ■- 1 I I I I I I I I I 1 1 1 1 �� \ ■ Q z �xXx Q IP I I I I I/ l l / l� / l l / �� A\ A �� J x I x L.I I II l�� 11 11 ��/ l 11 • \ Q x i x PRDP05Ef) SF I I I I I I I \ \\ \ I LLB W TH W RE n o 9 F' T� W xxx B�AC I G EXISTING, A\ A A I \ Q o APPROVED \ \ \ J U DC SEDIMENT x I V \ 3 BASIN #4 \ Q Z- s Lij U ui (f o I \ \ \ \ V A \ V \ \ \ V A \ \ \ :: �\ ♦ LJJ o� o Fui — z \ x / �/ \ \ VA \ V� ♦ �� \ \ ��uj CD z 0 — __ xxx X xxxx X x X-X\ / jam•, I A� \ \ \ \\ VA �� \�� ♦' A \ \ \ — SSF— -=-> • I A \ \ v �� I • \ \ \ F w �' SSF, / � / / , � � ,, .•.��.�.� �, � a M � I I � > SALAMANDER W�W� l / l ��j �/ / /� — / /ssF I I �� 5 I I \ ) CD STREET70, f1m, Ell. ~ — SALAMANDER STREET TO BE — _' l l / / / / i Z s� I / / I \ o — INSTALLED WITH APPROVED PHASE II / / ° / / / / / / / / APPROVED LIMITS OF / 38 \ ` "+` ss co J /� a °o \ I / / I DISTURBANCE, TYP. / / ss N \ / O / / //.' JOB NO. --- - GRAPSCALE �.�.: I / I I / / / �� / / 380 iC / Oj / EXISTING / �F �s ` Fj / 18215D sI ME ME ME Io o ie 3o so izo I I I I I I I N / / APP ED SUPER s .— F / �� KEY o I SILT FENCE-- / SCALE \I ME ME NEES SEEN — _ —-- ( IN FEET) \ 1= 30 ��_ - 1 inch = 30 ft EXISTING I I I ��� TP APPROVED TREE 3�0 \ \ SHEET NO. o \ \ \ PROTECTION \ \ 128 FENCING - — TH i / / A GRAPHIC SCALE / \ —��� \_� \ \\ ` \ \ O 30 0 s SCOTT R. LLINSz TP A \ \ \ \ zo _ A \ \ \ Z L) Lic. No. 035791,a APPROVED \ V A A \ \ \ ���'� \ / A 10 5/31/22 �8 \ REE-PROTECgON V A V A �s3�� \ \ VA V / / / A _ _ / ��S G1 z FENCING A A \ \'�\ ( IN FEET) V �' ��y �� SIONAL Y'Cr \ 1 inch - 30 ft. - i z PROPOSED EXPANSION \ \ V OF THE LIMITS OFF v \, rz NSF\ \ \\ DISTURBANCE, TYP. v o /�/ \\ \ PROPOSED \\ \ - _� -- o \SF\\ �SFD SSF_ \ \ SF WITH WIRE\ \\ �\ \ \ \ — \\ \\ \ i BACKING \\�\ "..\ \\ — _ \ F \ ww A \ \ \ \�44 - zo \ \ \ FLAT, LEVEL VDOT CL. AI COA�SE AGGREGATE OUTL-EIS \ +x------------ --- ---- -- --- ���__ y — -- -- -- A VA \ ��,,ROTECTIONWITHGEOTEXTILEFILT€RFABRIC� � m m + �� �����— — — — / - - — \� \ \V A V A' UNDE '-PROTECTION FABRIC TO BE KEYED INTO TH ISTINGA o M UY ss� v �� — _ _ / A V GROUNDAMIIN.OFg"ATTHEENDS&ALONGTHE o Q s V — \ - \ A A V A V PERIMETER. FABRIC TO OVERLAP A MIN. OF 9" (L=37, Wi= + \ \ \ \ CONTRACTOR TO _INSTALL — �' —� \` PROPOSED \ \ \ wiz 9', D=i8" MIN.). RIPRAP TO EXTEND TO CHANNEL BANKS. \~/� ij o I O +i \ \ \ S — THESE PERMANENT RETAINING EXISTING, APPROVED GREENWAY \ \ � ) - �y� — p S WALLS IN ESC PHASE III LIMITS OF DISTURBANCE, A \ TYP. \ \ VV A R �— + \ SF \ SF WITH — TYP. v A \ V\ \ WIRE A V A A V A \ \ �A n 0 SACKING .� V A V A \� \\ \ \ W / cGR\ ✓ NI i ADING oYv ISTURBANCESD\ SSF -- SSF COVERED UNDER WPO 202100007 4ao/446 o\St`I I I i N - ■■■r�■■■■N■■■fit■,■ ■ �� - �� ssF SFTSSF\ � �S o \ W N x PROPOSED TEMPORARY 018 MP TO ' \\,, ■ I ■ I x y- �\V� Q V — � A V A_OUTFACE PERMANENT RST�RM SEWER INTO I ■I I i \ PIENT BASIITDURING ESPHASE � \ , PROPOSED VDOT CL. AI I � ✓ PROTECTION I I 1 \ V (L=22 , W=4', D=1.5') u % /\/ ESC PHASE III SEDIMENT BASIN B DA=7.65 ac. �� ° �3st — �`— .\ I ■� CONTRACTOR SHALL RO H GRADE THE NORTHEAST RN M v (BASIN WAS 512fD &APPROVED FOR A LARGER �ORTION OF THE VILLAGE CENTER, UP TO SEDIMENT BASIN �'s \%� �_ _ _ I %CY) Z "o DRAINAGE AREA. APPROVED ESC PHASE II \ TIE-IN GRADES BUT SHALL DELAY THE INSTALLATION OF ITS DA=11.27 ac. AS SHOWN ON APPROVED \ HARDSCAPES IN ESC P ASE III. THIS SEQUENCING WILD N / \ _ SHEET 11 OF AMENDMENT #2) / / L I / \ /\ PROLONG T LIFE OF SEDIMENT BASIN B. 3 I \ / c I i -- �� / P — — - AP o i o- B B o� �/D I° o ) I I ��� AF PR POSED SAFETY bENCE TO a d7 `o APPROVED PAVED �� �� I �� _ W N � S \ DISCOURAGE PROPOSED VDOT CL. AI CE CONSTRUCTION ENTRANCE / CV (12' ST MIN.) W/ WASH RACK FROM -ENTERING A IVE RIPRAP OUTLET PROTECTION C % CONSTRUCTION SITE (L=27', W=4', D=1.5') ICI�L0 \� / 400 ��/� Q 454 V — i M LLI / P �`� . � � � � ��. I � � �� ���� ��� � � I��i��, � �� � � � � I ( l11 T � ] � /31 � PR� SED BLAN/KE 4io - 7 � � � � O SCOTT/R. CI?LLINS2 Lic. No. 035791 a J SS101INVAL F, y y \ - v - MAPPED FLOODPLAIN / / — / I GRAPHIC SCAT E v v 30 0 15 30 60 120 N \ \ / y y y v \ v LIMITS OF / OO / _ . - /\ ( IN FE T \ \ \ \ \ \ \ \ z S \ TREAM, TYP. \ / / \\ 1 inch = 30 t. y �y y \ f v _ ♦ \ v - �m _ - -_ -- - --- -- — /mil/1 \ — — _ - -v J \ \ \ 1 Z -- PRESERVEO� PROPOSED EXPANSION OF THE �— -- APPROVED 111 00' STEEP YP OPES\ \ LIMITS OF DISTURBANCE, \ \ \ \ ��\_- • , \ `` \ \ \ \ \ \ > I — � _ y l OF fb1S' CL. III RCP � TYP. — \ / \ \\ \ ��' \ p yy s @ 3.60% w/ VDOT \ -- ---- — — _ \ 1 Lu STD. EW-1 \ A A \ V� �� \ \ \ce EXISTING, APPROVED ` \ s \ \ \ I i APPROVED 100' WIDE VDOT CL AI RIPRAP \ LIMITS OF DISTURBANCE, — \ \ \—\ \ \ \ yy \ \ \ / LINED EMERGENCY SPILLWAY CREST � � ELEV.=396.66 . SPILLWAY TO HAVE 4:1 -IyP - - —/ �� — — \ SIDE SLOPES FOR VEHICULAR _ \ \ ---' \ \ - TRANSITIONS. _\ � _ — PROPOSED \ GREENWAY- \\ \ \ \ — — — -- APPROVED v v� - j % TYP.--v \ \ V\'� A 10' WIDE TOP / dS —O F-I)AM , � '_ � a � 6�� /� � � 5 � ASS �.rs �� � \ \ \ � � \� \ \ � \. / LEV.=398�®�j �� // — ��SS�SS- � S �� \ \ 'A -- "`� ��� � � / �� _ \ \ � APPROVED SUPER SILT 0 \��EN(91CLDLA=2.35 AC.F.SSF\ �' ySL.F./0.25AC. \ a ::-X/ \ s �S 4�3ss x e x x _ I APPROVED VDOT STD. B-1 (048" REINFORCED CONCRETE OPENING) TO SERVE AS 048" ESC RISER STRUCTURE. RISER I I 400 - TO INCLUDE AN 8'Wx8'Lx18"D CONCRETE FOUNDATION & \ TRASHRACK. SEE SWM DETAIL SHEET FOR TRASHRACK V SPECIFICATIONS. SEE APPROVED SHEET 13 FOR DETAILS. ESC x RISER RIM ELEV. =395.66' WITH DEWATERING ORIFICE AT I I 392.3'. SEDIMENT BASIN CLEANOUT ELEVATION= 390.98'. . Ix x l I �x \� . I v ,— \� II � j I I I I I I I o S• y ROPOSED SAFETY FENCE TO dURAGE PEDESTRIANS , E ti —448 - _ — — — = _NS\RU�Tf0A1 S CTI1[E =� PPROVE�ETY FEN�� = \ ESC PHASE III SEDIMENT BASIN B DA=7.65 ac. \ J W -INST L NS"WA�NG ��� \ (BASIN WAS SIZED &APPROVED FOR A LAR ER \ I I I I I _ ICKSAND, KEEP ou �_ — — — DRAINAGE AREA�PPROVEDI ESC PHASE I�I - \ ul)\� \\ \ DA=11.27 ac., AS SHOWN ON APPROVE �' ��/ /r■A �■� �� \\SHEET 11 OF AMENDMENT #2) II / I / _ Lu /W / A La CONTRA£TOHALROUGWGDETHE NORTHEASTERN PROPOSEDBLANKEP I I ' I _ PO RAIN GRAD SE I NGE CENTER, UP THETO-SEDIMENT B SIN S ---'�� MATTING, TYP. / A �; Z % HARDSCAPES IN ESC PHASE I-THISSEOO,UENCING WILL PROUONGii� LIFE -OF SEDIMERMSIN B. ■ h / \ ■ m�k �Fal x—-x—x—x—AEXI A / I �APP OVED o \ x x / (LIMITS OF I I I � / ISTU BAN E, \ q / x I PROPOSED SF x x k k S WITH WIRE \ \ \ \ \ 1 \ I \ BACkING I ' PROPOSED THE PROTECTION \� ` " U CONTRACTOR SHALL WRAP BUILDING I I / l I FENCING TO & INSTALLED � � \ 1 SITES SILT FENCE, AS SHOWN, I / I TYPICAL. SEE ESC PHASE III SEQUENCE / I I / / ALONG LIMITS QyF DISTURBANCE 1 OF CONSTRUCTION FOR TIMING. / LIfjE TOPROTECT PROPOSED \\\\� \\ \\ \ \ \ \ I THE LINE \ V \ \ x-x-x-x-x--x-x-x-x--x-x-x-x-x-x-x-x-x-x x-x- _ (J/ S co / l I MATCHLINE, SEE SHEET 128 � \ \ \ \ / /tn ■ -- F �// / \ i I� N ° ° LuCn r n V U C Cn v ' N ° L co 3 ° Q ❑ 0 oC o W N � �v III > Cn lako w ❑ J Q J o s /w Q\ C ❑ o 0 ° z N �3 z=Owe C) i--i 5 0 um U Lu LLI (n 0 F— W o� o z o ul U) �_ ° J V1 w J O z ,—, 0:: z w J Jw � w o O (A Q Q J � c) �o ❑ ❑ O O x � � s �I w ° J � F FLu C N 0 w a (10 °° JOB NO. 182150 0 SCALE ° 1 "=30' ° 0 SHEET NO. ❑ (YYl 12D 3 s PHASE IV EROSION & SEDIMENT CONTROL SEQUENCE OF N I. CONSTRUCTION I I XISTI NG e — X—X-X—X—X—X—X x—X—X—X—X—XX - — - \ • 1. ESC PHASE IV WILL CONTINUE WITH THE BUILDINGS' CONSTRUCTION IN THE - APPROVED SUPER • \\ /TH OF NORTHWEST AND SOUTHERN PORTIONS OF THE VILLAGE CENTER. THE AREAS x I I SILT FENCE TO /SURROUNDING THESE BUILDINGS WILL LARGELY BE STABILIZED ATTHIS TIME T' I I REMAIN O N THROUGH STONE, CONCRETEAND PAVEMENT APPLICATIONS, WITH SILTFENCE, SC LLI S '� °'o I x �' __ - --- -- I '�'•� / J TT R INLET PROTECTION, BLANKET MATTING AND TEMPORARY & PERMANENT x - - -" I - - <• - C) � SEEDING TREATING LOCALIZED AREAS. THE DOWNSTREAM APPROVED U Lic. No. 035791(>, SEDIMENT BASIN 4 WILL REMAIN FUNCTIONING ATTHISTIME. D _ -^O 2. WITH THE BULK OFTHE VILLAGE CENTER's CONSTRUCTION NOW AT FINAL \+ >.. I // \ } \ ADO 5/31/zz GRADES AND STABILIZED, OR CLOSE TO IT WITH THE EXCEPTION OF THE AREA -•l- SURROUNDING SEDIMENT BASIN B, THE CONTRACTOR SHALL BEGIN THE : �iPT / \ `\-l'\ 46o PROCESS OF REMOVING SEDIMENT BASIN B AND ITS TEMPORARY PIPES OUTFALLING INTO IT, THE COUNTY ESC INSPECTOR SHALL INSPECT THE SITE FOR MATCHLINE SEE SHEET 12G UPLAND STABILIZATION PRIOR TO THE BASIN's REMOVAL. AUTHORIZATION FROM THE COUNTY ESC INSPECTOR IS REQUIRED PRIOR TO THE REMOVAL OF .� • `ram` \\ \�-\ C ° I� } THE BASIN AND ANY ESC MEASURE. THE CONTRACTOR SHALL CLEAN THE \ \ \ F E= 6 x x SEDIMENT OUT OF THE SEDIMENT BASIN. THE BASIN SHALL BE PROPERLY x S --- DE4SS WATERED WITH A PUMP AND A FILTER ON THE SUCTION END AND A °� SSF \ -� �_ �- S I `" O SEDIMENT FILTER BAG ON THE OUTLET SIDE. DEWATERING OF THE BASIN >, > SHALL OCCUR NO SOONER THAN 48 HOURS AFTER THE LAST RAINFALL EVENT TO ENSURE PROPER SETTLING TIME IN THE BASIN. MUD AND SEDIMENT FROM --p F �Ix Ix THE BOTTOM OF THE SEDIMENT BASIN SHALL NOT BE PUMPED. THE 1 CONTRACTOR SHALL DISPOSE OF THE SEDIMENT IN ACCORDANCE WITH THE VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK. v 3. AFTER SEDIMENT BASIN B HAS BEEN CLEANED IT CAN BE FILLED. WHILE THIS IS HAPPENING, THE DOWNGRADE SILT FENCE WITH WIRE BACKING SHALL REMAIN P '� _ _ -- : _� / e • • O �. IN PLACE FOR SEDIMENT CONTROL. SIMILARLY, UPLAND INLET PROTECTION, - BLANKET MATTING AND TEMPORARY& PERMANENT STABILIZATION MEASURES WILL REMAIN IN EFFECT. —�W W --- -- N/- N/ : W V1!: �i: �l�l��—/(l1/ : Vl�� _: VV/- V1/ - V1l �l�l 00 J 4. WHILE SEDIMENT BASIN B IS BEING FILLED, THE CONTRACTOR CAN BEGIN INSTALLING THE REMAINING RETAINING WALLS. AS THE SITE IS BEING RAISED TO ROUGH GRADES, THE RETAINING WALLS' CONSTRUCTION WILL PROGRESS. 5. AS ROUGH GRADES ARE ACHIEVED IN THE NORTHEAST PORTION OF THE SITE I • / / / / / / / / - / / \>' w j WHERE BASIN B WAS REMOVED & FILLED, THE FINAL TWO BUILDING PADS .• / // / / / / / / n \ \ \ \ C] SHALL BE WRAPPED IN SILT FENCE. AS THIS IS OCCURRING, THE CONSTRUCTION p Q OF THE LAST UTILITIES, DRAINAGE STRUCTURES AND POWER LINES SHALL BE s s s COMPLETED, INCLUSIVE OF THE UNDERGROUND DETENTION SYSTEM AND ITS 1 y Z OUTFACE SYSTEM. DROP INLETS SHALL BE INSTALLED WITH INLET PROTECTION P AT EACH STRUCTURE. INLET PROTECTION SHALL BE INSPECTED AFTER EACH P RAINFALL EVENTAND REPAIRS SHALL BE MADE AS NECESSARY. IFTHE STONE FILTER BECOMES CLOGGED WITH SEDIMENT SO THAT IT NO LONGER - // - / ✓� �` / - ADEQUATELY PERFORMS ITS FUNCTION, THE STONE MUST BE PULLED AWAY // /// -� ��- /: -. ✓ j /�:/ 1/ /� / AND CLEANED AND/OR REPLACED. - / / \D ' W 6. PLEASE NOTE, THE YARD DRAIN SYSTEM OUTFALLING TO THE PROPOSED LEVEL e • 4•-1=--I SPREADER SHALL BE INSTALLED WITH THE LAST OF THE DRAINAGE STRUCTURES' o \ X-X' _ INSTALLATION. HOWEVERTHISYARD DRAIN SYSTEM SHALL BETEMPORARILY S ° X-X�X X X X X-X-X-X-X-- - --- --" X�- ---- BLOCKED IN STRUCTURE 4. STRUCTURE 4's LOWER OPENING DIRECTING / ._.d S------------ - I 'I` \ ''I �� - \ _-- - _- X �/- - ----LX-X-X-X X-X RUNOFF TO THE PROPOSED LEVEL SPREADER SHALL BE TEMPORARILY BLOCKED WITH PLYWOOD SO THE LEVEL SPREADER AND VEGETATED FILTER STRIP CAN BE- INSTALLEDATTHISTIMEWITHOUTRUNOFFBEINGCONVEYEDTOTHEM. 7. MEANWHILE, CONSTRUCTION OF THE FINAL PARKING LOT's CONCRETE CURB J �// \ Il �_ 1 I 1 �� i -`-- I / ram✓ \ \\ ' SHALL PROGRESS WITH THE FINAL DRAINAGE, UTILITY AND POWER INSTALLATIONS. THIS CONCRETE CURB INSTALLATION WILLTIE INTOTHE PREVIOUSLY INSTALLED ROADWAY & PARKING LOT CURBING. AS THE CURB INSTALLATION NEARS COMPLETION, THE CONTRACTOR SHALL ALSO APPLY THE / \ J x I I -: I I I \ \ \ ESC ..PHA_-SEfV 5EDWE 470 GRAVEL BASE AND SUBBASE FOR THE PROPOSED ROAD & PARKING AREAS. z I / \ ni I \ \ \ BASIN 4 O� . 5-acv \ x I J I — ���� \ w N - / = \ NEEDED. AS THIS IS HAPPENING, THE CONTRACTOR MAY ELECT TO INSTALL CONSTRUCTION ROAD STABILIZATION MEASURES SHALL BE APPLIED, AS 00 , FFE454. PORTIONS OF THE CONCRETE SIDEWALK. 8. WHILE CONCRETE AND STONE INSTALLATION IS UNDERWAY, THE CONTRACTORAPP--ROVED-FQR�-L R-GtR- CAN BEGIN BUILDING PAD AND BUILDING CONSTRUCTION ON THE FINALTWO _; �� _ --pRA-I-FVA 1E A'REXPRQVED'I P BUILDINGS. R THE SHALLTIME OFTHESE TWOBUILDIN INSTALLATIONS, CO ION, THE \ x \\V x - Esc -PHA ,.. X /// /// IP CONTRACTOR SHALL COMPLETE THE UTILITY INSTALLATIONS, CONNECTING THE -� — L� ""'tT`"��f-Q 1G: []2-ac ��� I / � UTILITIES TO THE BUILDINGS. THE ROOF DRAINS AND YARD DRAINS SHALL ALSO X� ( M O A PROVED BE INSTALLED AT THIS TIME AND CONNECTED TO THE DRAINAGE SYSTEM. - --- 9. THE PREVIOUSLY APPROVED SUMP UPLAND OF SEDIMENT BASIN 4 SHALL ALSO -X- - X-X X- X-X-XX- -X-X :X-X-X X. , x -" _ B EYES OF AMENDMENT #2� � � x : •'A�. ���� � / / BE REMOVED AT THIS TIME, ALLOWING FOR THE YARD DRAIN CONNECTION TO THE EXISTING APPROVED MANHOLE TO OCCUR. THIS RUNOFF WILL CONTINUE vi EXISTING TO BE DIRECTED INTO SEDIMENT BASIN 4 FOR TREATMENT VIA THE APPROVED, APPROVED SUPER Jy p �� x \ x �� // // \V •••` I EXISTING STORM SEWER. THE COUNTY ESC INSPECTOR SHALL INSPECT THE SITE SILT FENCE TO x \ X-X-X X----r---,---------X---�,- ° - !'�� ;.A S / / FOR UPLAND STABILIZATION PRIOR TO THE APPROVED SUMP's REMOVAL. I- - - I L9 AUTHORIZATION FROM THE COUNTY ESC INSPECTOR IS REQUIRED PRIOR TO REMAIN'. CONTRACTOR SHALL WRAP BUILDING THE REMOVAL OFTHE SUMP AND ANY ESC MEASURE. THE CONTRACTOR SHALL •° -.x �.: W W W r i SITES SILT CLEAN THE SEDIMENT OUT OF THE SUMP. THE SUMP SHALL BE PROPERLY x �. -- --_ � S FENCE, AS SHOWN, DEWATERED WITH A PUMP AND A FILTER ON THE SUCTION END AND A ',x S TYPICAL. SEE ESC OF SEQUENCE - / // V P I z SEDIMENT FILTER BAG ON THE OUTLET SIDE. DEWATERING OFTHE SUMP Q CONSTRUCTION FOR TIMING. v �� SHALL OCCUR NO SOONER THAN 48 HOURS AFTER THE LAST RAINFALL EVENT TO ENSURE PROPER SETTLING TIME IN THE SUMP. MUD AND SEDIMENT FROM -. I •.,,A I THE BOTTOM OF THE SUMP SHALL NOT BE PUMPED. THE CONTRACTOR SHALL' �� DISPOSE OF THE SEDIMENT IN ACCORDANCE WITH THE VIRGINIA EROSION & { �. : • A - SEDIMENT CONTROL HANDBOOK. A I �\ I 10. WITH THE SITE OVERWHELMING STABILIZED ATTHIS TIME FROM INLET \ PROTECTION, SILT FENCE SURROUNDING ALL OF THE BUILDING PADS, PARKING / EXISTING I 5z I I O L.L LOT &ROAD GRAVEL BASES, SUBBASES &ASPHALT, TEMPORARY &PERMANENT SEEDING, BLANKET MATTING AND SEDIMENT BASIN 4, THE CONSTRUCTION OF ° APPROVED LIMITS THE BUILDINGS CAN BE FINALIZED. WHILE THIS IS OCCURRING THE REMAINDER -' OF DISTURBANCE, l I N OF THE CONCRETE SIDEWALK CAN BE INSTALLED. Typ, I — I 1 11. WHILE BUILDING CONSTRUCTION IS NEARING COMPLETION, THE CONTRACTOR — x Z SHALL BEGIN THE LAST OF THE ASPHALT PAVING. THE CONTRACTOR MAY ELECT x Q _ I / \ TO DELAYTHE TOP COAT OF ASPHALT AT THIS TIME TO REDUCE THE RISK OF Q POTENTIAL DAMAGE FROM CONSTRUCTION VEHICULAR TRAFFIC WHILE 4 54— I . ' _� 450 - o x I J 45.0 BUILDING CONSTRUCTION IS FINISHING. -... x �. - � LLI =X—X—XXX—X—X—X— I 12. NCE BUILDING HA BEEN FINALIZED THE FINALT P AT F v> x - J 0 U G S 0 CO 0 g I �P � J ASPHALT CAN BE APPLIED IF IT HASN'T ALREADY BEEN 450— 13.AFTER ASPHALT IS APPLIED, AND THE LEVEL SPREADER's UPLAND WATERSHED IS - T STABILIZED, THE CONTRACTOR CAN REMOVE THE TEMPORARY PLYWOOD °• ' 4$0. - ' _ _>� BLOCKAGE IN STRUCTURE 4. BEFORE THE TEMPORARY BLOCKAGE IS REMOVED, THE LEVEL SPREADER AND ITS VEGETATED FILTER STRIP MUST FIRST BE STABILIZED AND THE ESC INSPECTOR MUST GIVE PRIOR APPROVAL. ONCE THE 0 TEMPORARY PLYWOOD IS REMOVED THE YARD SYSTEM WILL BE ACTIVATED T� O N HEREBY ALSO ACTIVATING THE LEVEL SPREADER AND FILTER STRIP. S S. : - O 14 WHILETHELEVEL SPREADER AND VEGETATED FILTER STRIP ARE BEING - -JS S. 8ACiIVATED THE CONTRACTOR HALL BEGIN THE PROCESS 0F CONVERTING L9 V F-- SEDIMENT BASIN 4 TO A PERMANENT SWIM FACILITY. THE COUNTY ESC IP z INSPECTOR SHALL INSPECT THE SITE FOR UPLAND STABILIZATION PRIOR TO THE Iw Q Z BASIN'S CONVERSION. AUTHORIZATION FROM THE COUNTY ESC INSPECTOR IS W I - 2 W O REQUIRED PRIOR TO THE CONVERSION OF THE BASIN AND THE REMOVAL OF U ANY ESC MEASURE. THE CONTRACTOR SHALL CLEAN THE SEDIMENT OUT OF THE SEDIMENT BASIN. THE BASIN SHALL BE PROPERLY DEWATERED WITH A PUMP � AND A FILTER ON THE SUCTION END AND A SEDIMENT FILTER BAG ON THE D 1 i ' ti 0 OUTLET SIDE. DEWATERING OF THE BASIN SHALL OCCUR NO SOONER THAN 48 ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® I P.. / - _ LLI - HOURS AFTER THE LAST RAINFALL EVENT TO ENSURE PROPER SETTLING TIME IN °. \ ® ® ® ® ® ® ® ® ® o+'. ® ® ® ® ® ® ® Z w ULn THE BASIN. MUD AND SEDIMENT FROM THE BOTTOM OF THE SEDIMENT BASIN •. P \ j -f :' ¢ ui ^x SHALL NOT BE PUMPED. THE CONTRACTOR SHALL DISPOSE OF THE SEDIMENT O w W IN ACCORDANCE WITH THE VIRGINIA EROSION& SEDIMENT CONTROL HANDBOOK.Ul `., \ L 15.ONCE TEMPORARY SEDIMENT BASIN 4 HAS BEEN CLEANED IT CAN BE h �,- .I_ --- L---�---�---L--- �---L-�-L---�---L---�---�---�---�---�---L---U) �-- CONVERTED TO A PERMANENT SWM FACILITY. THE FACILIT. SINTERIOR GRADES SHALL BE VERIFIED, ADJUSTED AS NECESSARY TO MATCH THELn APPROVED SWIM PLANS AND BE STABILIZED. THE TEMPORARY ESC DEWATERING • 1 �'' ph, W ORIFICE SHALL BE PLUGGED WATERTIGHT AND THE PROPOSED SWM ORIFICES D, / pry / LLI O i SHALL BE INSTALLED/ACTIVATED. \ / .I 16TOLLOWING BASIN 4's CONVERSION, THE CONTRACTOR CAN REMOVE THE In w INLET PROTECTIONS AND THE TREE PROTECTION & SILT FENCING SURROUNDING THE SITE. THE REMOVAL OF THESE ITEMS SHALL FIRST BE717 t. m I P : - U) > APPROVED BY THE COUNTY E INSPECTOR, AND THE T STORM INLETS' UPLAND ,. 0 COU SCSO SU -. , � ,.. ,. 71F� — - • . F•SUBAREAS MUST FIRST BE COMPLETELY STABILIZED.S H SSF .. SSF � SSF—SSF F•- � LLI 17.AS CONSTRUCTION IS NEARING COMPLETION THE CONTRACTOR SHALL V, °::-': t - •-- - ^ - ° . m - - CHECK/VERIFY THE STRUCTURAL INTEGRITY OF ALL DRAINAGE STRUCTURES - p.• - -e - °° • .. o- ° •>'-i. W Ln AND UTILITIES PRIORTOTHE PROJECT'S COMPLETION. THE STORM SEWER& YARD DRAINS SHALL BE INSPECTED (AND CLEANED IF APPLICABLE) FOR \ P POTENTIAL SEDIMENT BUILDUP &DEBRIS AFTER THE CONTRIBUTING DRAINAGE - - - Q O AREAS ARE STABILIZED. P -w w w w w�w w w�w w w w w w� w w w w w w w w w w w w w w w w w w w w w w w w w w w < 18.AFTER THE SITE IS PERMANENTLY STABILIZED, THE CONTRACTOR CAN BEGIN O SALAMANDER CD OF ANY REMAINING EROSION & SEDIMENT CONTROL MEASURES. NO ITEMS SHALL BE REMVED UNLESS THE UPSTREAM AREAS ARE STABILIZ THE INSPECTOR GIVES PERMISSION, TYPICAL. THE CONTRACTOR SHALL ED AND P J \ \STREET CD STABILIZE REMAINING AREAS OF THE SITE IN ACCORDANCE WITH THE EROSION U AND SEDIMENT CONTROL REQUIREMENTS. /IS 19.ALL AREAS OF DISTURBANCE SHALL BE TEMPORARILY OR PERMANENTLY 44 , ' •- . D' - s-. - ;> ; `- `• - _ w STABILIZED WITH SEED AND STRAW. _ _ _ : :. - —. ° - —. 20.THE CONTRACTOR SHALL MAINTAIN ALL EROSION CONTROL MEASURES AS • _ \ ASS is is is is isS d`s� ASS— -jSS �S 5 �� S SS ASS '� N-SAL�A__NDER STRI=ET TOLE — � � • w SPECIFIED IN THE VIRGINIA EROSION &SEDIMENT CONTROL HANDBOOK, _ - - REMOVING ONLY WHEN APPROVED BY THE LOCAL PROGRAM ADMINISTRATOR - \ N 456 r \ .. yS TACO WITH-APP�VED-PHASE It--- 0 w_ 1 i IN ACCORDANCE WITH THE VIRGINIA EROSION AND SEDIMENT CONTROL I ) I < . .. / / - HANDBOOK. ---- d V) I \ \ J / I J� - \ \ JOB NO. 21.ALLTEMPORARY EROSION AND SEDIMENTCONTROL MEASURES SHALL BE - / I 3SS��S y / / / SS—�SS 4 SS—�S \ \ REMOVED WITHIN 30 DAYS AFTER FINAL SITE STABILIZATION TH AFTER THE $ ° >. I EX3 TING 0 I �S ��/� /-� T yss/ / /'� �_� s 182150 TEMPORARY MEASURES ARE NO LONGER NEEDED, UNLESS OTHERWISE ASS / r ' ' V A C S L / / / / KEY AUTHORIZED BY THE LOCAL PROGRAM ADMINISTRATOR. TRAPPED SEDIMENT APPROVE SUPER '� ' \ S`' 43 1 SCALE AND THE DISTURBED SOIL AREAS RESULTING FROM THE DISPOSITION OF THE SILT FENCE'�I I / / / 1530 so \ 120 / / / I / / o'S / / SF \ TEMPORARY MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT `� N I EXI TING I /� .ass =30� —� _ 1�� FURTHER EROSION AND SEDIMENTATION. REMAIN, TYP. I I APPROVED LIMITS / N FEE OF'�IDIST RBANCE, �1 ( 0 NO. / � � SH�in 30 It P ' — ■ �" ' / 'PROPOSED SF - I v \ I PROPOSED TREE PROTECTI I 1 I\ / Vt �o I SCOTT R. LLINS� INSTALLED V \\\\A \ °j Lic. No. 035791 11 ALONG L LLI PROTECT PROPOSED � �� MITS OF DISTURBANCE \ \ � \ \ \ � \. \ I I A5/31/22 I R E LINO j I \ SSIONAL E�yG 1 � � TR x—x--x— x—x—x—x—x—x—x—x—x—x—x—x— / ����� / l I I A MATCHLINE, SEE SHEET 12H I �I I I I I I I �I I 1 I� 1 1 � M 1 i�I`W .I I / / P'o PROPOSED BLANKE� i — / / / / I I I / \\ 1 / I ■ MATTING, TYP. ■ SSF : " \ r SS PROPOSED LEVEL SPREAD ER''13FILTER STRIP TO BE \ \ \ \\ ■ Ix A SSA / INSTALLEDDIN ESC`PHASE V SEE ESC1� �/ PHASE IVSEQUENCEOF/CONSTRUCTION /�� /� V \ s u m I I \ I Sr S5 FOR TIMING OF -THE INSTALLATION. / \ \ �\ \ Z w 1 I CONTRA TAREDYARp DD L INS TO�THE�E�ISTI G \� \ \ � � \ PROPOIM LIMITS OF EXPANDED �R�� au .: / \ APPROV D 5T M 5E ER IN ESC PHA \ DISTURBANCE I _ - - \ \ \ EXISTINf� STORN� W H'TH REMO S V \\ \ ` / L� PROPOSED \ \ \\ \ \ 1 ~ > % STRUCTCJRES FROM 1 �0 0 HE APPROV�DU�P, 1 / APPRQVED WPO PLAN \\\ \ \ \ \EXISTING,\ TYP. \\ \ \ / /TO REMAIN \ �\\ \ �FfALL 0 I \ \ \ \ \ \ � ERSILT FENCE TO \ \ OO � \ \ \ 1 \ \ VA THE SWM 7t E \\ \ \ \ RE IN V UJ VA \P7Av V,� : v v� v v , ♦ / \ \\ V A OC 1C0 Izz % v :: v _ v \ 0 \ v A \ o \ � .-" A � A ----EXISTING, AP \AA �, mom I,�, "— O PROVED LIMITS OF x—x—x—x—x—x—x—x—x—x—x—x—x—x—x—x—x— —x— \ �� DISTURBANCE LINE \ w N / / \ rn rn 0 I o lop a 'sx X XJ -- ------ / IDS, 1 \ \ --- — ESC PHASE IV SEDIMENT % Ps BASIN 4 DA=15.16 ac. / \ �� o I I (BASIN WAS SIZED & ' / / // Idol U APPROVED FOR A LARGER — ---- -- ---- I I I DRAINAGE AREA. APPROVED I / I co IP I ESC PHASE I DA=16.02 ac., / � I AS SHOWN ON APPROVED 11 1 1 1 1 1 vI �I I 1 i SHEET 5 OF AMENDMENT #2) — — -- -- -- --- -- --- � v CONTRACTOR SHALL WRAP THE — ,. / I BUILDING &POOL SITES IN SILT I I I I\ I N I 1 I FENCE, AS SHOWN, TYPICAL. SE — i ESC SEQUENCE OFCN - CONSTRUCTION FOR TIMING. N Q z — I: rX—X—X — / / / / / / \ V I ♦ I \ % 1 P A PROVED 5E I� �NB SIN 4 �RErMAIN FUt�CTIIONAL�DURING / ' I 1 ♦ I J CONTRUCTION. SEE ESC PHg5E IV / / / 1 \ \ \ I �A Q N �.j I x I I ggT E TIMING OF ITS CR NVERNIFNR� / M 1 \ ♦ \ A U) E p� \ PROPOSE SF w TH W RE I I M I I d ♦ \ I z W a x S I B�AC�I G I �/ ( �, EXISTING, A\\ ♦ A A I V O O I I I I APPROVED v ♦ \\ \ \ J V Ln V \ W f x I I I I I I I I I I I I \\ SEDIMENT \ \ \ ♦ \ \ \ W x I I I I I I \ BASIN #4 \ ♦ Q z Ste_ S ,"�, 1 I i �I\I I 1 �\ \ \\\\ \ �' \ ♦ A o '.I 1 1 1 \�\ VA \ \ \ \ V A\ ` �� \ V A ♦ A \ \ W w Q = I 1 1 \ \ \ \ \ \\ V _ , \ \ • \\ \ \ \ �\ w U v, - 1 \\\\ \\\\ \ \�\ \\� —\ \ \ • \ ♦ c uj :r x / I ♦ I \ \ \ V A \ VA \ v \ /� • \ w Lu iP iP IP IP ��l i I A�� \\\ VA�� V A \ \ _ Z X x X-x-x x x-x X-x-x-x-x--x-x-x-x-x � w SSF— SSF—SSF— ssr\ . u w w w w w w w w I I I ,I 1 SALAMANDER �W� l /i� / / /ssF C:) STREET W� / / / s / �/ I / / I A N U ~ SALAMANDER STREET TO BE — - wtu 7 �\ — / / / i 3g2 \ \ S OO l / / / I 0- _ \ — — INSTALLED WITH APPROVED PHASE II � ° \� / i / l r � s a � \ GRAPHIC SCALE I l l l l / / 3g0/e� o%/ I JOB No. / N / / EXIS NU 182150 30 0 15 30 60 120 \ \ � I I I / APPR ED SUPER S I I SILT FENCE — — \—��j —KEY I SCALE \ � (IN FEET) I I � _ - ��_ �_ — EXISTING � \ \ 1 inch = 30 ft. I I I I —\ TP APPROVED TREE 370 \ \ \ \ SHEET NO. \ \ \ \ PROTECTION ` \ ~ FENCING 12F 3: 3: GRAPHIC SCALE v SCOTT R. LINS 20, �\ TP V A A A A V V\ ao o 15 so so o ��� A \ U Lic. No. 035791 APPROVED 'v A A V A A \ \ \ ��o� ;� �� / v _ — _ — / �� 5/31/22 tv� TREE V A V A �� \ \ \ \ — / A _ / ° Ez / FENCING \ \ \ \ \ \ \\ ' _ — — — _ i ssl0NaL ET�� —�� inch z — 3C _ ft. Y \ \ \ _ PROPOSED EXPANSION \ \\ \ \\ \ \, ------ \ — -- _ ---- A OF THE LIMITS OF\ z V DISTURBANCE, TYP.V A VA �, VA \� VAA \\ �� � \ \ � � �� VA .'� • VA PROPOSED— \ SSF SF WITH WIRE — — \\ \ \ i A�sSF�BAC�CING A A �� �� A Q _� vv —4 \ \ \� \� � __ /� _ _ 4� � - S � T �A� � \� � � � � / / — _ A � \ V A \ • �� � z m \ ��� V �_ �� _ __ \ — _ _ — -- - / \ x—x—x—x—x—x— ——x—x—x—x—x—x—x—xx—x—x—x—x-x—x—x—x x x—x—x—x—x—x—x—x—x-2� — — -- _ \ \ \ \ - � co ��ST --- ------ -- \ V A \ \ \ n m w /}/+� \ �� �� ��PROP >� -- \ \ x� — — EXISTING, APPROVED _ V GREENWAY V A v \ •o �' ��' / V A-- LIMITS OF DISTURBANCE_ \ �� TYP. \ /+ \ SSp \ _ SF WITH -- - �� V A A \�ROPOSED RETAINING WALL YSTEM VA n FBI y WIRE - - TYR \ V A TO B CONSTRUCTED IN ESC PHASE + \ \ BACKING— IV WHEN SEDIMENT BASIN B IS Ln ix V .�\ \ V A _ I -- W REMOVED AND THE SURROUNDING � � U, AREAS'ARE FILLED. o FFE=455.67 _ 44a/ 6 x / BSMT=445-0% 0 .. ," T�I YX C—� X—X—X—X X X X:—X—" ' ,.,.•(. >. b \ \ c IFU / \ \ \ \ SCOTT R. LLINS20,_ U Lic. No. 035791(I� N a Z a / MAPPED � FLOODPLAIN, O / TYP. \ - - -'� GRAPHIC SCA E \ �'•\\ \ \ ` ` o 30 0 15 30 so 120 77, LIMITS OF FE / f� • / / (IN Tzo / � \� STREAM, TYP. 1 inch = 30 t. \ .. Lf) co _ \ - _ _ -- - \ PRSERVE6 U\ �— --- STEEP \ SUES\ ✓ PROPOSED EXPANSION OF THE I\� - -LYP. \ LIMITS OF DISTURBANCE, \ \yy \ \ - -- - � TYP. _ \ I EXISTING, APPROVED A v O \ \ I PROPOSED RETAINING WALL - — - — \ LIMITS OF DISTURBANCE; / -SYSTEM TO BE_CONSTRUCTED IN ,TYP: ESC PHASE IV WHEN SEDIMENT BASIN B IS REMOVED AND THE \ \\ \ ly v /\\ \ moo S --- UNDING AREAS ARE-FItLED. \ / / �— — PROPOSED \ \ \ \ s �_� GREENPWAY, A V\\TY • \q\ y ii y� — ✓ \ �T zx ass �\ _ _—_-- APPROVED SUPER SILT \�\ � � � A \ \ �V � o ENCE DA=2.35 AC. 950 L.F. SSF I L.F. / 0.25 AC. \\ \ ( s \ y E v \ /� �� \ \L9 yu s yy x x V A 1 v� I N �� - \ 5 �kk I P ~ 3 N ip LLf V x, x t y LLe i of sja / I I I x F 5 I1I \�1 I 4•zo� o0 PROPOSED UNDERGROUND DETENTION SYSTEM, ITS o ` I I I S• OUTFALL PIPES, RIPRAP LINED OUTLET PROTECTION, � L9 STONE LEVEL SPREADERS' & THE VEGETATED I \ I I I Q Z 448 FILTER STRIP TO BE CONSTRUCTED IN ESC PHASE IV. �� — A \ `� I �■■� I I I I I I I I I \ I LJJ SEE THE ESC PHASE IV SEQUENCE OF CONSTRUCTION FOR THE TIMING OF THESE ITEMS, INCLUSIVE OF THE �— A \ I \ I I I I I I V �� o TEMPORARY PLYWOOD BLOCKAGE IN STRUCTURE 4. VA\V� \ \ I 1 1 I I I I I I I I i Q -\\_ 11 1\ IIII I I C I I I I I I Y U v / I Lu �PROPOSED' BLANKET `, In \ \ I / I \ / I I � E / � i Z i\ i! MATTING TYP. I / J � / I I_ LLLI LB z w I N z i--i w w - ■ I - _ -- I \ \ IIII / I I I 1 I \�o _ ; _ > z • _ 1 III �/ I I I 1 I I I I I \\ \\ - APP OI O I I I I I \ \ \ � W U \ �I VE a I I I \\ J w I P x LIMITS OF > X / IIII �\ ICI V l I I; I I _ A V AV A I\ z o gISTU BAN E, \ \ O Q PROPOSED SF WITH WIRE BACKING' I �ROEP pTSOE D TREE PROTECTION ROTECTI N " U � tu- F FENCINq TO BE INSTALLED 0 w ONG LIMITS a mOLCU / �� i� - ,\ �PT NE�OF�OSED JOB NO. 'x -- REEL VAS\ �A I �� - --- — — — — — ------- X X X X X I � I . , x � � 182150 � 0 � I I I I \ � MATCHLINE, SEE SHEET 12F \ \ �E \ SCALE m ♦ '' xx x \xx�x � �x. / _V X�'II�/II II II�II�IIII IIII I �I�II�\I`�`,`I� _ x 30 I. • \ Pre-Dev. Subarea Post lDev. Subarea Method of 9VAC25-870-66 Method of 9VAC25 870-66 Method of 9VAC25-870-66 Method of 9VAC25-870-66 TH O (Point of Interest) (Point of Interest) Channel Protection Compliance Limits of Analysis for Channel Protection Flood Protection Compliance Limits of Analysis for Flood Protection III I I / /// !_- _ ��i �, - = �� �_ _ �� _ J �✓ // �� \ \ \0, 1 1 Section B.3.a (Energy Balance) N/A (Energy Balance Satisified) Section C.2.a (10-yr Peak Flow is Confined within pond) Section C.3.c (Outfalls to mapped Floodplain) 2 2 Section B.3.a (Energy Balance) N/A (Energy Balance Satisified) ISecii6W C.(10-yr Peak Flow is Confined within UGD) Section C.3.c (Outfalls to mapped Floodplain) 2.a SCOTT R. LINS'Z PORTIONTHIS ARCH VENUE's �— VA \ V _— % m✓ q L� Lio No. 035791 EXTENSION IS TREATED IUNDE r\��/����\/\��IIIIIIIIIIIII��II\II III�IIlII�\IIIII�Ih1��\l1�IIII1\II\I\�II II II'IIIl1��\IIIv\\II I \�I/IlI1�I\III�/1 /II lIII\1III �IQ� \IIIII��IIl�III\I�11I�I\�II�I I\III��\U\`�\II=III��IIJI�� 1 I II\I��I\�II II✓ \ II \1I1I I ��I\,r\I1Iq��� I l\/I�II�\I�\�IlV ��/ �/ \VIIII_I\I ���II II IIIV I�\\II�!\�//I I� III IIIIAII\��II I�III�III II�II\�I\I VI� \I��/I I/)I�I\ �/\jI A \\II1I ��_ �\�� I �I\I\I1\\\II\ // I I\/��1\II1 /I\/II/�I� �\\IIIII��I1II\ II(I II�II\I IIII1I\IIII\III1III�IIIIII�I1III1I��III I\ IIIIV I1 IIII11�I1I ' II I �III�� I/ III I �,I)III 1I� p,� II ; �I�I IVIIIhIIIhIVIIII�IIIIIII IIIII I I I II�I. .I.I01 ��I' IICtI�III�I 3 lmIIII It I I �II I lI I a I �IIIII I1 _ I . II IIIIII/IIII1I I I I1II I-.$�� .IIi LIkII/I�`I II�-1Ir I:I-I \O� .}I4�I1I"+ I. /� 4 �I/l �/�_�\- �I_ 5IrIII IIIII'0 III��IIIIIIIIlIII I\ I�i�I�IIII�� IIII II\�iI I I�I II IIII '�I IIII I\ \lII �/ �jIIII \' 'II\\�/I\ \1\��\\ ��\� V\ I�1■��I/y��/ I.I1• � 1 \\ ■;\�. ��I )� II�_11�\��\ II��1 v\I / \i�� I '�\ \�\I1V,I��vv � \ .\/ �II I .\ � v\\\1 1 ' I —\V.��\�\ �_�\I1 VI\I�\v/\-A\� yI1���vl�\ � v\$.���■� \\ _—��_ �`/ l4�/�\. / v. \��f �� \ 4���\ . \_i—�V�3�, -i— \/—V—���VV �y ■�■°�_\\—�_V_��°5�—�/�— -�- �_�¢—�� � A�¢\—/— �_B/\\ �t�=_��_\ /9���\ % _ // T/6 ��H—\—/�_—��-I/_� �S�_ // /_��_— V�APPROVED PPROVED W/�Il�'JPO/// I -\\%202�\/A \o\0/00�� 06��—\ �V4O/ � \EV.'\ %� �S/-v�_\�� o�/ %, l�\ /�I /— \'„�n / �y� \ v��_ / .1 �4!,✓5�� ,�4 /- N/i/-R Sl\ //\ i\A \ �� \\/ / "�/�/°i\�/v/J5�/ 1I�4°I/�V�/e �I// I/�I i/ °�I/ °�/�/\�// �\l /�/\°J I \ i /III�A I/II1 i` �\ '� �.,��/\ zV-�-; I�aI I -I /4I°4�z�I3 2��k3 zz �z �I3-I,a I - ' �I38�II I� \I� VI/iI � 9�.'I�_ /_-_,_ - • II/II-,\I - $I"AS�_--i-I� I\//(vI�//-\r�a! /I,r1-_-1 /r ./� moI\\I.V_ i I�/� w 1I-I —\ �/AIor�/���/`..//I��� /-s\��%-\ _��� 3f�.s �Y�\/'V6 \% \ 'I /- I e/�I�III /.�/v/!IsJIv�1 IV-�/'�6A�r—A�w I�v .V�� f�V\ /v� /\v V •nr�- vv—�.��. •\'i w ��T�T�� �—��- �,�J HO10/ .r �'Q I_v�V.'� .TA�S(���. .V� �I. ��HvV��A/\_/\ .v �-\�R\/vr /�J�I\ \/I E—f � \ ��_— A y/. .�4w / � /.rlIA (�\�—�. / B/Ii oI1� �Q.� 1= ���'L��,�I:7Iy O"—vI �/'1�Iv_�aCrI Q��"$/_IrIA/�KI���—v_;p/��I / �r/R�%w.��8Iaa,IvE ��v � :� /I� F TPA��I���R�J�/P�I-,OCI 7EP/— ��WI\/ICPv /�R�/� �OM/.IOE1I �/,�/7I�ISE�V—/�/V����VI5,�EN,A�VP/E1�E�P•1 DT1�//./ S _ .I/ / v\ .// /■■ ��/ �I/� / ��\I�/� �'/ /v r � �\//1/ j \ �—V.�/1/_\ „� L L'�//��I /- �$ •// �/v./ /�� //v��i��H/I /�_I\� � �_/�I/ •I �—�/�/�` �_w\ /� ` I Io lI/ v_\I°_ /�— v-I°_�_ I/� f( ._ F/� /-1/ I�'\�� � / /��°�-/��°\��,%+�•-� 1w/�Oo_--/l �I� A SiI— r% v.�%v —1�C�lIGry4///II/_/FI9�6�/O��I PjL �I/I�L5I R�I-�/OIYi �I /// /, f /S/ F� ^V�1T// •/��(V�P�I�E'� R��/-�m� ,)M' �/O// •� A�r�/ P\B°�' O�� s:�/I/�,,\� �S�— // //`�I/��E�, 1�DIII/��\, �/ / � � �� � �I)/�� /\I��-� I�/ _��'-< r/\ \-/vI\/�I � \\Irf_���IV\�l II\ ► ,i I�����I ��AI= �\/ I \�\l1�I'�I / .Ivv V�I/ \V I\�-\ _A� —I�jV �� I ��A\A�1 \V\ 1\ /—\ \ ��'A \�\Is\ 1 v_— —� V \I;I r �\ \�\v`/ o�V�i4 I1 / IIj/ 0�\��/ / 1 I�1v/ / IJ0�\ �_/`\\/-1// /0,_ (� I/�_\ � ceAI I I 01 — // \ _�\I\—\ �1 _ _ II \ �� /_\ /1/ _ �P-/ .�/ .'\�\.��=_ - j \/II1/_/�,5� \��'�j �Ij� r\ \--V.(_�'_ -- 1I �--�— IAP�\E— ' �, — L_6 \/IAj0- \'—,\ '� ■ �I■�\��/■� �=I I � =\7 �II �@� \IIN�/` I\�Ij_�-I��T 1�II/ �II` I I\I�1�I%I�1II/��■ IIT■fi"i`\III��o®I■I/�I/ I.// II��I� .I�=/II®.�^—I���— � �II /I /. jI _ �1 I'— iI� /(/II/�II_%`I IIII� °_ /vII \III/�/ ®Il / _//Il�AII, </�I•/�®I//•���\// //I/�/•te/��//// ®�/•�v/�///�///�./3V�/v�®/,� _A�. �/��7-,r\ �%3�� � 1®_/_/1-f�/\ j/ \��/\��v/7\1 \�Vvj� �I _v 1� ;`\\ V_ v,�® ,/\I\\/�� I �� �I /�l�1 I�I�/w1 II v�� I\_�I® ��IvI II� �/ �I/�wA �\I v�\®\\II�} \ �\-1 II \� 1 I►/\//�I��\II�� I��v II I\�v—�V\�IP\������ /�I I\O/��\ &$ +I \/I1�v\ ���I /�IIN_\I1 �� J \ ��I-1DVv���I IiI i�I����II#v /A\ � 1v�II\ �4 �®\�II� \/L\� Iv�lI\ l-1cla� i�wAI\�® o\/�II'1 I \LII ",/z��/�� �:\•®�/ ,—i\-�/ /•_-®�® �l .�—\ • _�:�-A�.®�°�®e�':- •\n:V.\ i:-®O=�V�.-�A�J\.��\S\�AA- Vi/�v��A l/ /v�/ \�� � D \��.V� ��/R.P\�A// VO-A .®�3�Tw- \P/ �a \ ®I/ E � \ \/\ �V / �_1©A��`/I\vlCi \\ , ��vA�'al/wA.�� \Iv/V \v V I\ \ /I1 ���Jl/�AVI// I /1 iA\\�\I \®/���®��/I� �/VV�I1\/V� �\�\ -\\�/\A//AA1% �Iv ,�/AAmo\\A�1���o.�:\�:a/`:\ �I �:� \����1,:�1I1�I�V.'\ V� A/j<% ./\ /�� ® \ /I \\_ ' AI \\J � \/\�D��IA]\�MS®L/A\�l\ l®T�VEI M® \� \� /UIlIN\ ,IRDT/�I /� 1�B/S�M\A,IrI�jE®�NT\N�1i1I� 1®Tw/I'V�1 �. // /I#� �®E�V®_ �I\4 /I _II/\� V / I W.I �\FL®�iv�1I�I\/A\ ® M lT� -,\,�EA®�/ .�v/R � �®Vy\ •VTQ�AAQ�\_��/AH_AA® / \A�\/�I �j \�• �/i\® �II\r 'v y/ �"� \//\\�®�®vi�/�ce�\'s0o�/VIwI� TYrA//\v \® ��"/�\ /�P=®\�\/ ®/�.I��� _/v®\y ® �\l/�\/ IV�//(`r ®/�vI �®/�•I�� NN/ \v��® I�I / I �/ ��V ���,:#i/\l\w—.� v.�:,i /��:i�®/\ ®���/®A:w / / . ��_ /iI /_ //I//� ��•/®- / /I — kQM 5�oNQJ>M—NL�WFFN -- L3II 1 /22 MODIFICATIONS ARE PROPOSED T O,AREA-&FTSSTORMWATER QUANTITY, QUALITY TEATM :J Av� CONCENTRATED OUTFACE � ® r U TO ,=fj_0 MfvZwzwUscoswzwoo 11 omoOqE00'�/ �ELEV.-18' /j/ �/ THIS AREA (OK48) RRECEIVES S ORMW\CONTED O QUALITYQUANTITY AND TREATMENT7rPAPROVED WPO 2080OS &APPROVED 201700037 AMENDMENT #2. NO MODIFICATIONS ARE PROPOSED TO THIS AREA ITS wSTORMWATER QUANTITY & QUALITY TRATCOZZ 0 (H THIS �JIII �I �1SPAB OIIVJ�IENT7TOM#4 ND 0 UPSTREAM IT-4C 0 Tc02rsZ �O® ® PPRO DITURBANCEUDCDLI�)TT ® PO W/ NERWce oNOTE: THIS PLAN.PROPOSES-TREATMENTHE LIMITS OF DISTURBANCE ASSOCIATED WITH THE VILLAGE ���� TH"EVELOP(ENT OF THE ELANESTREET- . s>ro EAREA CE , \1L /0 TIN THESE AREAS RECEIVE WATER QUALIEATMENOERAGE ®/ EPARTE VSMP PLANS. TaUNDERS.—..OPI \�,UIZIUMDANCE BOUNDARY DEFINEFOR UALITY REQUIREMENTS ASSOCIATED WITH THIS PLAN\\(i.e. THE VILLAGE CENTER&SALAMANDER STREET).r/ ®�P It" �V700 3T\7ADM W r-4 in o 5-$OW ® 5 f� 9FER�� SM lIlfi r Df® PREDEOV �\/ �5A21® Tc_0.4M1�/ h L9 i N\\\rn w w w w LOCATIONF CII PPROVED3AREA (BLOCK 4A) RECEIVES STORMWAT QUANTITY AND QUALITY TREATMENT UNDER APPROVED WPO 201800051 &APPROVED WPOE® 0201700037 AMENDMENT #2. NO MODIFICATIO WATER QUALITY &QUANTITY TREATMENT. STORARE PROPOSED TO THISA& Cf5 APROVZ -000NCENT OU AL ►.I. \� w PE5n�V _ LU ®PRVEaSTEE® PE�YP.° ®N Yw THIS AREA (BLOCK SA) RECEI®pLv QUANTITY AND QUALITY TREATMENT UNDER APPROVED WED 0WE' V ® 20170003 AMENDMENT *2. MO[®®D[CATION® 0L9 ARE PROPOSED TO THIS AREA & ITS /STORMWATER QUANTITY &QUALTY TREATMENT. )7TZ c)o•2B) Rij� L QUALITY TREATMENT 0 LU z APPROVED WPO 20180008NO MODIFICATIONS3 �IS AREA &ITS TREATU 2 W 0w 3g4 92 LLI Ljj 3,- o Uw�__w 1 /w °/�PRE-DEVELOPMENT SWM NOTES: 1.APPROVED'POND 4' PROVIDES SWM TREATMENT FOR BOTH THE VILLAGE CENTER (SHOWN ON THE NEXT SHEET) AND THE APPROVED SALAMANDER STREET SHOWN ON THIS SHEET (WPO 201800050).o 2. APPROVED'POND 4'WAS OVER DESIGNED FOR ITS WATERSHED WHICH O INCLUDED THE VILLAGE CENTER & SALAMANDER STREET) SO THAT IT COULD ALLOW FOR THIS FUTURE DEVELOPMENT TO DRAIN TO IT. THIS PLAN SIMPLY z CONFIRMS APPROVED POND 4' CAN ADEQUATELY HANDLE THE VILLAGE z!�\�CENTER SHOWN ON THE NEXT SHEET. F aU v 3. BECAUSE APPROVED 'POND 4'TREATS THE VILLAGE CENTER & SALAMANDER STREET, THERE ARE NO PRE -DEVELOPMENT IMPERVIOUS AREAS DRAINING TO I \x ':: APPROVED 'POND 4' IN THIS PLAN's PRE -DEVELOPMENT ANALYSIS. THE JOB NO. � IMPERVIOUS AREAS SHOWN ON THIS SHEET DEPICT THE APPROVED PLANS, 182150 II BUT ARE CONSERVATIVELY NOT TABULATED IN THE PRE -DEVELOPMENT iI V/I II ANALYSIS OF SUBAREAS A & B. SUBAREAS A & B WERE ANALYZED WITH A SCALE c36cococEanc°O3acc000�xo, i 25% WOODS & 75% GRASS LAND COVER TO REFLECT PRE -CONSTRUCTION 1 =120 � /� GROUND COVERS. o EPV SPREADER (LS-1 > ORIGINALC�OVED_U4D / / \� / ` 4. SUBAREAS A & B WERE USED IN THIS PLAN's CHANNEL &FLOOD PROTECTION SHEET NO. n 'I WP 00037AN EVISED WITH WP 1800013. / / / ( �I IIII _ THIS LEVEL SPREnDASNEVENsucrED&rs i / ��� a \, \1 ANALYSES FOR THE VILLAGE CENTER & APPROVED SALAMANDER STREET. 14 r REMOVAL W PPROVED UNDER IS WP0 201700037 / �J J AMENDM T #2's PRIOR APPR VAL / b _................................................................................................. \\�� �" VSMP AMENDMENT #4 STORMWATER MANAGEMENT NARRATIVE: TH �F ® OVERVIEW: \ III I I ,.-__ THIS PROJECT IS PART OF THE BROOKHILL DEVELOPMENT, AND STORM WATER TREATMENT IS (Koc: IT - ��"' /��// l - \�\� - - ma's'/\l ®® X/ / / I\ \ ' PROVIDED TO MITIGATE THE IMPACTS FROM THE PROJECT'S PROPOSED IMPROVEMENTS. THE'�1STORMWATER MANAGEMENT PLAN REMAINS IN COMPLIANCE WITQH PART IIB SWMQ REQUIREMENTS, AND\ \ + ( CONTINUES TO MEET MINIMUM STATE & COUNTY STORMWATER UANTITY AND UALITY �' -\REQUIREMENTS. TT R. LINS'ZTHIS PORTIONOF ARCHER AVENUE'S * - - \\ NOTE: THIS LAY6U�I FOR MASTER PLANNING OF THE STORMW TE . No. 035791 \ - \ I _i I 1 EXTENSION IS TREATED UNDER " / \ WATER UALITY SUMMARY I -APPROVED WP03-0z0000oa No ,'------ / �� >\ �- - L� � - -- MANAGEMENT FACILITY ONLY. ALL CONSTRUCTION OF RETAINING WALLS OR \ \ �\\ � �;'; ii;r ® \� \ V lI YQ �610DiriCATIONS ARE PROPOSED TO THIS .. \\ \ �\ 1 ITHE DEVELOPMENT OF THE PROPOSED VILLAGE CENTER &THE APPROVED SALAMANDER STREET WILL A�5/31/22 ` o �GRADING OPERATIONS WITHIN THIS AREA SHALL MEET THE THE NEWLY \ \ ® / ` 7 II I l / 1 1 / \ ` I GENERATE A REQUIRED PHOSPHOROUS REMOVAL RATE OF 30.68 Ibs/yr. THE REQUIRED PHOSPHOROUS O� AREA& ITS STORMWATER QUANTm &„ \\ o \ ADOPTED GRADING ORDINANCE, AS PART OF 18.4.3.3 OF THE COUNTY ZONING 1 ( 1/ \ \ ' r \ �'L \Q \ \���\ ORDINANCE o \ \ \ III \� \ ` \ \ ! REMOVAL RATE WILL BE MET VIA VARIOUS BEST MANAGEMENT PRACTICES. THE APPROVED POND 4 QUALITY T$(rATME ; -_ / \\� .. \\ \' �� _ _-- ' - - ' / \I11\ \ \ \ \� \ \ \ \ \ \\ I \ \-< AND ITS LEVEL SPREADER DISCHARGING SHEET FLOWS INTO A CONSERVATION AREA WILL REMAIN ZONAL F+� WITH THIS AMENDMENT, THOUGH ITS CAPACITIES HAVE BEEN VERIFIED TO BE ADEQUATE AGAIN WITH ^ a ::.:�.: \1 \ \ \ \ \\ \\ ` I I I THIS AMENDMENT'S UPDATED POST -DEVELOPMENT WATERSHED. THE APPROVED POND 4, ITS LEVEL /®� Jam/ SPREADER AND THE DOWNSTREAM CONSERVATION AREA WILL REMOVE 23.62 Ibs/yr OF PHOSPHOROUS Oi.� o® %i-- e' \ \ \ \ \\\ \\ \- IN SUBAREA'A'. ALSO, A NEW UNDERGROUND DETENTION SYSTEM 'B', LEVEL SPREADER 'B' AND 0 0 ®® 0 0 0 0 DOWNSTREAM VEGETATED FILTER STRIP ARE PROPOSED WITH THIS AMENDMENT #4 TO TREAT 0 0 � 0 � \ � ` SUBAREA 'B'. THESE PROPOSED BMPs WILL REPLACE THE APPROVED AMENDMENT #2's LEVEL II 'WET \ I� \\ i ■ \ ��cENiRA$�buiFALL#z �- - ® .. \ \ \ \ \ \ \ \\ \\\\\\\\ I D � � POND B'. THE LEVEL SPREADER 'B' ASSOCIATED WITH THIS AMENDMENT #4 RELEASES THE --- _� 1�\ ----� \ ✓_ ® TREATMENT VOLUME RUNOFF FROM SUBAREA'B' IN A SHEET FLOW MANNER TO A VEGETATED FILTER \ - �_ ^ ® \\� \ \ \ \ _ �1� \ I I 1 I STRIP WITH B SOILS. THIS CONFIGURATION RESULTS IN AN ADDITIONAL 7.17 Ibs/yr OF i � � HOSPHOROUS REMOVAL IN SUBAREA B . p AFTER THE ABOVE ANALYSIS OF THE VILLAGE CENTER AND SALAMANDER STREET WAS PERFORMED, AN OVERALL ANALYSIS OF THE BROOKHILL DEVELOPMENT WAS COMPLETED. IN GENERAL, THE OVERALL ® \ -., `\ / -.:.�: ?�:. RESULT OF THIS VSMP AMENDMENT #4 IS A 0.74 Ibs/yr PHOSPHOROUS REMOVAL RATE REQUIREMENT - INCREASE (PROPOSED 30.68 Ibs/yr VS. PREVIOUSLY APPROVED 29.94 Ibs/yr) AND A 3.44 Ibs/yr ✓ II \Ii / \ �- / _ \ 1 _ :' \ __ / I �.. REDUCTION IN THE PHOSPHOROUS REMOVAL RATE PROVIDED (PROPOSED 30.79 Ibs/yr VS. I I I •� �.� /\� \ \ \ = 30' OF OLF w/ C ELEV.=1' ■ _ \ a 1 PREVIOUSLY APPROVED 34.23 Ibs/yr). THIS 3.44 Ibs/yr DEFICIT IN PHOSPHOROUS REMOVAL, THE II \ II - �� �\ \ rr 60' OF CONC. FLOW w/ 0 Z 1\ 1 I I I THIS AREA (BLOCK 4B) RECEIVES STORMWATER \ \� I ELEV.=3'�-,..,,,� \ ® \ I I / I - PREVIOUSLY APPROVED 2.21 Ibs/yr DEFICIT FROM THE PRIOR APPROVAL's REMOVAL OF LS 11, A 2.08 O J QUANTITY AND QUALITY TREATMENT UNDER / / \\\\\\ a / / Ibs/yr CREDIT THAT WAS APPLIED TO THE BROOKHILL BLOCKS 9-11 PLANS THAT IS NO LONGER F Q c APPROVED WPO 201800051 &APPROVED wP� -I _ ' ' - ''� AVAILABLE WITH THIS AMENDMENT's REVISIONS AND A MORE IMPERVIOUS VILLAGE CENTER SHOWN //� b- �\ IIIII I I 201700037 AMENDMENT #2. NO MODIFICATIONS I I III / / \ I THAN ORIGINALLY ENVISIONED RESULTS IN THE NEED TO PURCHASE 8.96 Ibs/yr OF PHOSPHOROUSARE PROPOSED TO THIS AREA & ITS STORMWATER QUANTITY & QUALM TREATMENT. ,.// REMOVAL. 0 (n \ �I I II _ c ■ ■ _ i I �� \\ �\ THEREFORE, ED REMAIN IN COMPLIANCE THIS VSMP AMENDMENT #4 REQUIRES AN ON IbsE A O Z \ II I I �/ / \ \ sUOeAREA B ■ ■-: \ I ® ! �� \\\ �. NUTRIENT CREDIT PURCHASE. THE BROOKHILL DEVELOPMENT CONTINUES TO TREAT ONSITE A O Q MINIMUM OF 75% OF THE REQUIRED PHOSPHOROUS REMOVAL, SEE SHEET 19 FOR ADDITIONAL Ln Z \7.23 ac. \\'l \\ � DETAILS REGARDING THE OVERALL BROOKHILL DEVELOPMENT'S WATER QUALITY COMPLIANCE, AND � THE ATTACHED SWIM CALCULATIONS PACKET FOR THIS AMENDMENT's WATER QUALITY CALCULATIONS U w 1 I I I �\ ■\\\\ DISTURBANCE E AaLoS THE ASSOCIATED WITH THE VILLAGE CENTER &SALAMANDER STREET. � \ I I -. ._/ �► � _ � I --.....-_ �, ■" ', . - �', ® � I ® APPROVED LIMTTS OF V� DISTURBANCE UNDER WPO WATER QUANTITY SUMMARY r I �_ �° �' ■ ■ ■ ■ ■ ■ ■ ■ / , ® 7 7, M T I I THE PROPOSED STORMWATER QUANTITY ANALYSIS INCLUDES AN IMPERVIOUS AREA FACTOR OF SAFETY, AS SHOWN ON THIS SHEET AND IN THE CALCULATIONS PACKET. THE PROPOSED IMPACTS Uj ASSOCIATED WITH THE VILLAGE CENTER &SALAMANDER STREET, IN CONJUNCTION WITH THE \ - � � � � � ' � � � � NOTE: � ' � � ' I � I � � IMPERVIOUS AREA FACTOR OF SAFETY, ARE MITIGATED THROUGH THE ATTENUATION IN THE \ +� - = = PROPOSED LEVEL SPREADER 1 THE LIMITS OF DISTURBANCE ASSOCIATED W HE VILLAGE APPROVED POND 4 AND THIS AMENDMENT #4's NEW UNDERGROUND DETENTION SYSTEM 'B'. 0 'B' & VEGETATED FILTER WITH T so A•••� / °� CENTER &APPROVED SALAMANDER STREET - acres. HIS ' � _ __ --- <•_' I /� -. - -� ® STRIP WITH TYPE B SOILS TO PROVIDE WATER QUALM AREA Excwoes ARCHER AVENUE, BLOCKS 8 N APPROVED 'POND 4' TREATS SUBAREA 'A', AND AS REFERENCED ABOVE, WILL REMAIN WITH THIS •-' - "' ' ` --- - - - A. -- ��/ - 0 rREATMEN7 FOR SUBAREA 'e' ATHESE AREAS RECEIVE WATER QUA ATMENT/COVERAGE AMENDMENT. THE APPROVED 'POND W WAS CONFIRMED TO BE ADEQUATE FOR THE UPDATED SUBAREA I - _ 1 i ��� UNDER SEPARATE VSMP PLANS. THI ac.-LIMITS OF Q �1W -- \\ - �-' // "`�'"`'`''=`'`'° \ S� 'A' WITH MINOR PROPOSED CHANGES TO THE RISER'S ORIFICES. �. �'� y /. ) / ® \ DISTURBANCE BOUNDARY DEFINES T OUNDARY FOR _ - WATER QUALITY REQUIREMENTS ASSOCIATED WITH THIS PLAN ® - - - ® ' THE VILLAGE CENTER & SALAMANDER STREET). UNDERGROUND DETENTION SYSTEM T' TREATS SUBAREA T' THE RUNOFF FROM UNDERGROUND AQ� -�� DETENTION SYSTEM 'B' IS RELEASED VIA TWO OUTFALL SYSTEMS. THE LOWER, SMALLER DIAMETER II �� OUTFACE DISCHARGES THE TREATMENT VOLUME RUNOFF TO THE AFOREMENTIONED LEVEL SPREADER TP 'MANNER. DOWNSTREAM VEGETATED FILTER STRIP THIS RUNOFF IS RELEASED IN A SHEET FLOW '� ! I \ V� MANNER. FOR STORM EVENTS IN EXCESS OF THE TREATMENT VOLUME, THE RUNOFF IS ROUTED TO AN ( -� ■ -- ® `\ 700�37, A`p1 NDM T 4 i N s• / A PosT-Dev. ^-' % ,, o_ ,��-. - - _ _ `, -:-' -: 0 I I ® ��� ELEVATED, LARGER DIAMETER OUTFACE THAT HAS A CONCENTRATED OUTFACE &OUTLET PROTECTION. w � �� ® �V \ \� ac, moo` �/ /,fj�•-- ® f�5, A _, -t- BOTH SWIM FACILITIES (APPROVED POND 4 & PROPOSED UNDERGROUND DETENTION SYSTEM 'B') HAVE 0 POND 4 SWIM ACCESS TO BE id \ �\ 0P \ \\ VA �/ CONCENTRATED OUTFALLS, WHICH ESTABLISHES THE POINTS OF INTEREST (POI). APPROVED 'POND 4'LI ALIGNMENTCONFG AL SO P ODVIDES \ I / / ACCESS TO LEVEL ���.� 1' \� \\\\V\ DRAINS TO POI #1 AND THE CONCENTRATED OUTFACE BELOW UNDERGROUND DETENTION SYSTEM 'B' \ I a 11 I \� � b - � x�, �., � � � DRAINS TO POI #2. CHANNEL PROTECTION COMPLIANCE IS MET FOR POI #1 &POI #2 VIA SPREADER B' &THE ? I �'..'.: ��, ' NIA \ \ 9VAC25-870-66, SUBSECTION B.3.a (i.e. THE ENERGY BALANCE CALCULATIONS). FLOOD PROTECTION _. ° ao . 9 4. / VEGETATED FILTER STRIP. I III �� ��/V®,, 5� \\ yl- - FOR POI #1 & POI #2 IS MET VIA 9VAC25-870-66, SUBSECTION C.2.a WITH A LIMITS OF ANALYSIS SET BY SUBSECTION C.3.c (i.e. THE 10-YEAR DESIGN STORM IS CONTAINED & IS RELEASED INTO A MAPPED ----- - _ _ , ,. � / - " � \\\, FLOODPLAIN). �° 100' OF OLF w A ELEV.-22' * , - - - _ _--. -. 120 OF CHANNEL FLOW DOWN� ® . ... THE EMBANKMEN �I L9 r \ I II I 111111111 11L1�1LIJILIJ r 111 I I I I I I I I I I III\VI I � \ � � � � w- w. � _ . 4XI� y � � v � . a. " VA\ \ � ��.: - \v��\v\ v\\ � �� ��'C �iIIIIIIIIII�II I�I� I wvv� _ Z � Z Ill�it 1 I I I I V r y �' \\' 1�V A\ �� r/ IIII I I I\ �--a THIS AREA (BLOCK 4A) RECEIVES STORM WATER �/ V j / ® \\ /y �� I I I II I \ I \ \� �A IIII �I\\ I I I I QUANTITY AND 2QUALITY 01800051 &AMENT UNDER -loic :... .,. ... .. _..... yam, -. .: �.. // iR ® ,/ V���\ \�"s �-II I II �� APPROVED WP0201800051 &APPROVED WPO �_ I I I 1 201700037 AMENDMENT #2. NO MODIFICATIONS -�� I �� / 3a� ® I \ \ \ IIIII I II \� Q I� II �\ IIII II I 1 ■ V ARE PROPOSED TO THIS AREA &ITS �� " - I J STORMWATER QUALITY & QUANTITY TREATMENT. / \ I I : 3 �� ®® . PRQ E TY II I I 11?� I � I � -_ � IIIII II\ I I I � ��!�i. � ;' l I I � / � / � 3 , _ � I v� � / � I I � i v - _� vv ® � 1'1 I I I I ', I. .� A ■ -�^-- I / I , - --I- \ / I I I \ / \ \ 398 V-�E�D' ��\_ ®� \ \�\\ \\ \ �/ l I I I i i s:::.. V\ A� \ �\ c04 al �.J W III\IIIII ✓ A / III v /// \ I� \ _- _ ( \ �� MI5 \ ��® �,j::....A\ � � � w \SLOPES�Y6PE� \ \ _\ \,_� v, w (1) Q II �RESERVEV�3'rEEP\ --�V A\ \ r. 7�1� i J z / Ill \ �L,E_P. v \ �y �IIIIII III �I IIIII v\� ///j / y N�� > gyl VA1\\ I III v� ■ �/ i i _- I�V -� ���'`" 'C' � �vvvv ��v�© ®I _ �- y � �I I\ \V� III II� \ ■- °© yv��\ v y s8 �� =_ --_LLJ THIS AREA (BLOCK 8A) RECEIVES ENT UN QUANTITY AND QUALM TREATMENT UNDER IIII \ \\\ \� I • II \ . APPROVED WPO 201900004 &APPROVED WPO \ / - -_ _ l \ ✓, I I I I / / -� \ \ \\ \\ \\ \ \ \ \ \ �® \ \ \\'j4 `- 1ST // p � \ \' ®I_ O•- � O 201700037 AMENDMENT #2. NO MODIFICATIONS 1 -�� J 11 ARE PROPOSED TO THIS AREA &ITS I I �'6 / / \ \I \ (q // ac STORM WATER QUANTITY &QUALITY TREATMENT. / / j \ /• l 1 I I I I \ \ � \ \\ \ \ 1 \ \ \ \\ ® I \ \ ®O'� z 1 / \\\ �o J\ 4 - Q 2 0 \\\1\ I I�I� \ • v� y _ II I� I 1 I \\ �/ / / - v vv / i I l I I : w o 02- - r� I I \\\\ \ \ / / I � 432- AREA (BLOCK 8B) RECEIVES QUARMWALITY T QUANTITY AND 11 11 1 ` ,\V� A�\ V ,'f'��� W 1 1 k \ \ \ I I I 7 `I\\I` \\\ \I I 1\ \ �� J� . / �_/ \\ 9 a.•:, 'F ' r �i - APPROVED WPO 201800080 NO . i F- \ \ \ \ / / \\� \ \� �/ /� \� / / /// ® / � �� / -^ W L MODIFICATIONS ARE PROPOSED / / _�� OLU \ \\\\ V -400 �� V' TOTHIS AREA &ITS TREAT. j =� r VA AV� �- / \ �\ \ / �, �� ®® �V /� o®>�� ®; � Ul vvv _ y v� y l�� ��,�- ©��% i \� ��� - w �0° % ��`� A�%� / LLI J J �IIIIIIII\\VA vvvVA \ 0,39�)y�� �I I�■I �v <. V ,� �1 I�I � � V- �r �� ��� / ,: '.�� � v � y� � /38\\�\V\ V� - _\�"/\ � � y �/j'� � �l" y� � Z L.LI � _ o. � IPost-Development Impervious Area Summary ISubarea A LU �- III I I I 1 \ \�\-\ / \ I \ 11 \I /j/ \ \ Roads, Driveways &Parking Lots 222,850 sf O O I \ I I I I III 111 II � \ / r / / v Buildin s & Gommunit Pool Area 191,600 sf I I \ II / y 36 i \ /� J - �\ \ -POLO GROUNDS e j gy 0 sf I °�� ROAD / \ Sidewalks34,35 Q O 0- III - _ y _ Factor of Safety Impervious Area 5,0000 sf 4 sf c W I I 5380 _ 1.14 Post -Development Impervious Area Summary Subarea 6 Roads &Parking Lots 201,350 sf F- Buildings 64,175 sf I II / WATERSHED SUMMARY FOR SUBAREA A Sidewalks 11,275 sf w �IIVI�" I II III\v yA \\\\ .Av /// \ �� 0 w �/ °°°•° / / �� / \ \ CN Factor of Safety Impervious Area 5,000 sf \ \ / Area, 1-year Flow, 2-year Flow, 10-year Flow, o III I^ IIII \\ \�:' / �/ / / // ac. cfs cfs cfs 281,800 sf JOB No \ � � IIIIV I�j IIIII II\IIII 0 DA A (Pre-Dev.) 60 16.25 2.83 6.07 20.62 Overall Acreage Summary / DA A (Post-Dev.) 85 16.22 0.33 1.13 41.38 VRRM Post -Development Impervious Area Summary 182150 / \ / / / f ` I \ \ /\ / (Boundary defined by this Project's Limits of Disturbance) SCALE LEVEL SPRE¢DER (LS-1J )ORIGINALLYOVEQ LND WP 00037 AIN EVISED WITH WP"1800013. THIS LEVEL SPR DER WAS NEVER C NSTRUCiED & ITS WATERSHED SUMMARY FOR SUBAREA B Roads, Driveways & Parking Lots 437,750 sf 1 "-120' CN Area, 1-year Flow, 2-year Flow, 10-year Flow, Buildings & Community Pool Area 255,775 sf ac. cfs cfs cfs Sidewalks 52,325 sf SHEET N0. EEAA �y7 DA B (Pre-Dev.) 60 7.20 1.52 3.32 11.31 Factor of Safety Impervious Area 0 sf 15 REMOVAL WA54APPROVED UNDERTHIS WPO 201700037 / 23.45 23.45 DA B (Post-Dev.) 94 7.23 0.16 2.89 35.28 745,850 sf AMENDM T #2's PRIOR APPR VAC. t Pre -Development Post -Development Area, ac. Area, ac. DAA 16.25 16.22 DA B 7.20 7.23 PROPOSED VILLAGE CENTER UNDERGROUND DETENTION SYSTEM 'B' DETAIL SCALE 1"=30' a 10-yr PEA 2-yr PE, 1-yr PEA STR:6 VDOT 48" MH STA. 0+00.00 N OU _ CDOO O~~ a0 ~ U-) � IQ N N N M M O Oi0)1Md 0 0� .. > +r-: H- t �?o0 INV IN: 4310 TO 7 .6INV I ~aZzz OUT: 431.50 TO 4 450 �'�--- 450 FKL)I'JbLL)AU.L�>bMI11VjbIA1 FORT SPECTIO A & MAIN 'tf rENANC PROPOS D GRAD 445 445 1.7' 5' MIN.) 0 4" I I I 440 P o o R 440 P T , E H K WSE=442.34 E T IK WSE=440.41 - K WSE=439.99 1 STR. ELEVA ED 030yFyb 3 BYPA S PIPE 0 STR. S T 435 )) AN,A E 435 430 430 0 - ^ 2/,74" HDPE 99.96 LF - 0 0.65% P O z" E T CON P F R T F:B F 425 P T 425 S O A o UP LP( 24" HDPE P OP D T .7 OER W 19.62 LF 0 1.27% U D DEI Y oo' 4" O D aE 6 ) 420 420 F , Y / 415 415 STR:2 VDOT 60" MH / STA. 0+19.25 410 1 TP=444.23 410 INV IN: 431.50 TO 4 INV IN: 439.75 TO 9 INV OUT: 386.75 TO 405 405 XISTIN / GRADE 400 / 400 395 395 390 390 CONTRACTOR SHALL I STALLA ' HICKST ELPLAT ATTHE BOTTOM O THE STRUCTURE 385 385 O co O 0)O KCUIJLO� C6 4 0) O N i"1 I!) 0+50 1+00 1+50 2+00 2+50 UGD SYSTEM - STR. z Ku PROFILE SCALES 1"=5' (V) 1"=50'(H) 445 445 STIR. 9, S DLID ELEVATED HI WE BYPASS 11PE CRO NN TO BI SET ATTOPOFUNDEFIGROUND DETENTION SYST M (zz.75' OF 440 030" SOLID HDPE Cal1.04% 440 F/ I PROPO EDUND RGROU D 435 DETEN ION SYS EM 435 430 430 PROPO ED GRAD 425 425 420 420 PROPO ED RETAINING WALL, YP. 415 STR:2 VDOT 60" MH 415 STA. 0+19.25 TP=444.23 INV IN: 431.50 TO 4 P. INV IN: 439.75 TO 9 410 f INV OUT: 386.75 TO 410 / T 405 405 / 400 400 395 395 % A CONTRACTOR TO REPLAC THE EXISTIN 0z " CLJ III RCP SEDIMEI ITBASIN UTFAL PIPE WITH A EW 030' L. IV PI E 390 390 PROPOSED VD T STD. E -i 385 \ INV=470 00 385 CONTRA TORSH)LLINST LLA 380 380 BO TIOK OFTHELSTRUCTURE 30" CL. IV RCP 112.06 LF 0 4.24% 375 375 FLAT, L VEL VDC T CL. Al COARSE A GGREGA E OUTLET ROTEC ION WITF GEOTExrILE FILT R FABRIC UNDERL YMENT. ABRIC TO BE KEYE D / ENDS & ALO G THE PERIMETER FABRIC O - VERLAP A MIN. O 9" (L=z7 Wi-6', z=9', D= " 370 MIN.). RIPRAP TO XTEND OCHAN EL BAN S. 370 n r- 0 00 O O co � O 4 O O O M O O oD N r r 0+50 1+00 1+50 2+00 2+25 UGD BYPASS - OUTFACE \FLAT, LEVEL \ TIAl COARSE OUTLET PROTECTION W TH EOTEXTILE FILTER \FABRIC UNDERLAYMENT. FABRIC TO BE KEYED INTO .I :.I. `\ CfHE EXISTING GROUND A MIN. OF 9" ATTHE ENDS& \ \ 1 ALONG THE PERIMETER. FABRIC TO OVERLAP A MIN. OF 9" (L=27, W1=6', Wz-9', D=z8" MIN.). RIPRAP TO\ EXTEND TO CHANNEL BANKS. / / / / ly / PROPOSE I STD. EW-i W-i / i*s��v � PROPOSED ACCESS MH w/STAIRS FOR /\ INSPECTION & MAINTENANCE, TYP. 0120 INV. 432.75' PROPOSED PERFORATED 0120" CMP 2+25 A 1 PROP_OSED VARIABLE \ I/�\ WIDTH SWIM EASEMENT \ \ \ SEE THIS SHEET FOR THE PROFILE / OFTHEUNDERGROLIND DE TENTION \ //�- SYSTEMANDI\PRIM AROUTFAIL E. UNDERGROUND DETENTION SYSTEM I I\ / SURROUNDED IN STONE TO DETAIN \ RUNOFF \ \ ... / �. .I. 20 CMP ® 0.50%. 0120" INV. 432.56' \ / . . 0120" INV. 432.68' 0120INV. 432 62 X \ V A \ -� LIMITSOF STREAM, TYP. \ \ O .INV.- \ � \ . .. 0� . .. SERVED STEE \ _ ... ELOPES, TYP. P ELEVATED 03o" HDPE TO CONVEY \` / L \ LARGER MORE SEVERE STORM EVENTS. 0120wv 43229 4. ... � ... 120" INV. 432.23' .... 0120", INV. 432.16'. �'"'r / J 52 00' OF 0120' CMP C�i 0 509 � / 0120" INV. 432.03' .'. .. 0120 ESTRICTIVE STEEL WEIR PLATE. i\ /0120" WEIR PLATE INV. 432.00' ., .. SEE DETAIL ON THIS SHEET. / PROPOSED LOWER 0z4" HDPE PRIMARY .;'�/.. x__-�- ../ ...� OUTFACE TO CONVEY MORE COMMON, ROPOSED ELEVATED 024 HDPE STORM SEWER TO LESS SEVERE STORM EVENTS. \ CONVEY STORM EVENTS IN EXCESS OF THE TREATMENT J o \ /.. VOLUME RUNOFF TO CONCENTRATED OUTFALL #z & ITS RIPRAP LINED OUTLET PROTECTION. MANAGE`D STEEP - 4 �,., _ SLOPES, \TYP. .>; / / .\ " PROPOSED io'WIDE SWIM '.� ... - ACCESS EASEMENT / ' \ _ = ARKING kOTTO SERVEAS \ 4 W` - � ` /.__- �_ STSS TO THE `h \ \.UNRERGROUND DETENTION \...SYSTEM & MANHOLES FOR \ -INSPECTION & MAINTENANCE \ ./ \ PROPOSED LOWER 012' HDPE YARD DRAINS TO CONVEY THE TREATMENT VOLUME RUNOFF TO LEVEL SPREADER'B' & THE VEGETATED FILTER STRIP CONTRACTOR SHALL CALL THE COUNTY INSPECTOR& ENGINEERING DEPARTMENT 24-HOURS BEFORE ANY\�- ANTICIPATEDCONSTRUCTIONACTIVITIESFORTHEUGD SYSTEM. THIS IS INCLUSIVE OF WHEN THE UNDERGROUND DETENTION SYSTEM SUBGRADE IS READY FOR PIPE,_ \�,.�� - \ .. .. CONSTRUCTION, BUT BEFORE STONE BEDDING IS INSTALLED. x ,., \ \.. . UNDERGROUND DETENTION SYSTEM STORAGE TABLE (E) (F) (G) (A) (B) (C) (D) C-B DxE B+F Facility Elevations Area of 120" UGD System Void Space of Area of Stone Storage Area in Total UGD System (ft) Perforated CMP (sf) Footprint (sf) Stone (%) (sf) Stone (cf) Storage Area (sf) 431.50 0 7,492 40% 7,492 2,997 2,997 432.00 0 7,492 40% 7,492 2,997 2,997 433.00 3,444 7,492 40% 4,048 1,619 5,063 434.00 4,592 7,492 40% 2,900 1,160 5,752 435.00 5,261 7,492 40% 2,231 892 6,153 436.00 5,624 7,492 40% 1,868 747 6,371 437.00 5,740 7,492 40% 1,752 701 6,441 438.00 5,624 7,492 40% 1,868 747 6,371 439.00 5,261 7,492 40% 2,231 892 6,153 440.00 4,592 7,492 40% 2,900 1,160 5,752 441.00 3,444 7,492 40% 4,048 1,619 5,063 442.00 0 7,492 40% 7,492 2,997 2,997 442.50 0 7,492 40% 7,492 2,997 2,997 Ur NCKML rKUrILC INU 1 CZ): i. ALL FILL TO BE PLACED AT 95% COMPACTION. 2. MINIMUM 3.S' OF COVER MUST BE MAINTAINED OVER W/L. 3. MINIMUM OF i' OF VERTICAL SEPARATION FROM STORM SEWER & W/L AND i.S' OF SEPARATION BETWEEN W/L & SANITARY SEWER MUST BE PROVIDED. 4. CLASS I BACKFILL MATERIAL SHALL BE CRUSHER RUN AGGREGATE SIZE NO. 2S OR 26, AGGREGATE BASE MATERIAL SIZE 21A OR 21B, FLOWABLE FILL, CONFORMING TO SECTIONS 205, 208 OR 249 RESPECTIVELY, OR CRUSHED GLASS CONFORMING TO THE SIZE REQUIREMENTS FOR CRUSHER RUN AGGREGATE SIZE 2S AND 26, PER VDOT ROAD AND BRIDGE SPECIFICATIONS, SECTION 302.03(a)2G "BACKFILLING". 5. ALL DRAINAGE STRUCTURES WITH A DEPTH OF i2' OR GREATER SHALL HAVE SAFETY SLABS IN ACCORDANCE WITH STANDARD SL-i AS FOUND IN THE 2oo8 ROAD AND BRIDGE STANDARDS. 6. HDPE CAN BE USED AS AN ACCEPTABLE SUBSTITUTE FOR CL. III RCP FOR THE DRAINAGE PIPES. ALL DRAINAGE PIPE BEDDING INSTALLATIONS SHALL BE IN ACCORDANCE WITH VDOT STANDARD PB-i. 7. ALL DRAINAGE STRUCTURES WITH A DEPTH OF 4' OR GREATER SHALL HAVE STEPS IN ACCORDANCE WITH STANDARD ST-i AS FOUND IN THE 2oo8 ROAD AND BRIDGE STANDARDS. 8. ALL DRAINAGE STRUCTURES WITH DROPS 4' OR GREATER SHALL Ay' STEEL PLATE INSTALLED IN THE BOTTOM OF THE MANHOLE. MATCHLINE, SEE SHEET 16B ■I I jw_I_L 0 YD9 � \ YD8 0120" WEIR PLATE DETAIL (UNDERGROUND DETENTION SYSTEM 'B') NOTE: SCALE:1"=5' WEIR PLATE TO BE SECURELY BOLTED, OR SIMILARLY FASTENED, TO THE DETENTION SYSTEM. MANUFACTURE / INSTALL ONE (1) 024" HIGH-FLO\A ORIFICE IN THE STEEL WEIR PLATE ATTHE TOP OF THE WEIR PLATE (INVERT ELEVATION=440.00') INSTALL TRASH RACKS ON ALL - ORIFICES, TYP. SEE SHEET 17 FOR THE WEIR PLATE'S TRASHRACK DETAIL, OR EQUIVALENT. ELEV.=442.00' (TOP OF PIPE) ELEV NFORCED iz GA. STEELPLATE ELEV.=432.00' MANUFACTURE / INSTALL (i) ONE 02-j" LOW -FLOW ORIFICE IN THE STEEL WEIR PLATE ATTHE LOW POINT OF THE DETENTION SYSTEM (INVERT ELEVATION= 432.00') GENERAL SWIM NOTES: z. STATE APPROVED TRASH RACKS AND ORIFICES SHALL BE INSTALLED ON ALL ORIFICE OPENINGS. SEE DETAILS ON SHEET 17, OR EQUIVALENT, FOR INSTALLATION. z. CONCRETE FOUNDATIONS SHALL BE INSTALLED ON ALL RISER STRUCTURES MEETING MINIMUM VESCH 3.14 SPECIFICATIONS. 3. CONTRACTOR SHALL HIRE ATHIRD PARTY GEOTECHNICAL ENGINEER TO ENSURE THE EMBANKMENTS ARE STRUCTURALLY SOUND. THE EMBANKMENTS SHALL HAVE A COMPACTED CLAY CORE WITH A CUTOFF TRENCH & BE IN ACCORDANCE WITH THE DETAILS SHOWN ON THE NEXT SHEET. ALL EXISTING AND PROPOSED FILL MATERIAL AND PROPOSED CONSTRUCTION SHALL BE APPROVED BY AN ONSITE GEOTECHNICAL ENGINEER PRESENT DURING THE CONSTRUCTION OF THE EMBANKMENTS AND FILL AREAS, AND PRESENT DURING THE CORE SAMPLING. 4. THE DOWNSTREAM EMBANKMENT SLOPES OF ALL PERMANENT FACILITIES SHALL HAVE MAXIMUM 3:1 SLOPE. SCOTT/R. CO'LLINS'Z, Lic. No. 035791 a 5/31/22 "Ai z O a r Z w Co O O Ln Z J 0 ¢ Z w W w u ri w w U ul z J J 0 u ti M (M CY) N 4 co N (] Cn N N Lu J U7 Lu H O J Q U I LL) Lu Lu U) Lu of �Q V C:) CD N T_1 z 0 U ��W Vl J H� i 0 0 0� co w J r r JOB NO. 182150 SCALE AS SHOWN SHEET NO. 16 CONTRACTOR GENERAL REQUIREMENTS: 2. THE CONTRACTOR SHALL BE RESPONSIBLE FOR LAYOUT OF ALL WORK COVERED UNDER THESE PLANS. TEMPORARY COVER FOR CMP 2. REFER TO THE APPROVED FINAL SITE PLAN FOR ANY DETAILED SITE INFORMATION. PROTECTION 3. ALL WORK SHALL BE COORDINATED WITH OTHER PARTIES. CONSTRUCTION LOADS iEffik q. MINOR FIELD ADJUSTMENTS MAYBE NECESSARY DUE TO SITE CONDITIONS. MAJOR ADJUSTMENTS MUST BE FINISHED SLAB APPROVED BY THE DESIGNER. GRADE HUGGER 5. ANYRETAINING WALLSAND FOUNDATIONS CONSTRUCTED IN THE VICINITY OF THE UNDERGROUND DETENTION HEIGHT OF -� BAND FLAT GASKET SYSTEM SHALL BE REVIEWED AND APPROVED BY THE STRUCTURAL ENGINEER AND A GEOTECHNICAL ENGINEER. COVER T SINGLE BAR, 6. CONTACT COLLINS ENGINEERING (434.293.3729) REGARDING ANY QUESTIONS CONCERNING THE UNDERGROUND ON SYSTEM. o BOLT AND STRAP(SBBS) 7 ALLFIDETEILLIEMBANK ENT MATERIAL SHALL CONSIST PREDOMINANTLY OF SOIL AND BEPLACEDNSUCCESSIVE 11111 I UNIFORM LAYERS NOT MORE THAN 8 INCHES IN THICKNESS BEFORE COMPACTION OVERTHE ENTIRE AREA IN ! i ACCORDANCE WITH THE CURRENT VDOT ROAD AND BRIDGE SPECIFICATIONS.----------------------------------------------1 I 1 I ) I i ! ! ! I i I I I ! I ! i ! i ! i Lh,.. 8. THE CONTRACTOR SHALL VERIFY ALL DIMENSIONS IN THE FIELD AND NOTIFY THE DESIGNER OF ANY VARIANCE 36"0 MAX., HS-25 ACCESS CASTING WITH GRADE RINGS AS REQUIRED, TO BE PROVIDED AND INSTALLED BY CONTRACTOR. MAYBE TOP MOUNTED (AS SHOWN) OR RECESSED. RIM/FINISHED lY- GRADE __ _I . VARIES v d e a 1 ! 1 ! ! 1 I 1 ! 1 11 11 Il ! 1 ! 1 ! 1 ! 1 ! 1 ! 1 FROM THE PLAN PRIOR TO ORDERING AND CONSTRUCTION. PRIOR TO CONSTRUCTION THE CONTRACTOR SHALL GASKET MATERIAL TEST -DIG AT THE EXISTING INLETS & OUTFALLS TO CONFIRM THE INVERTS AND TO ENSURE THE PROPOSEDmqll SUFFICIENT TO PREVENT GRADES CAN BE ACHIEVED. SLAB FROM BEARING ON FLAT GASKET 9 ALL EXCAVATION FOR UNDERGROUND PIPE INSTALLATION MUST COMPLY WITHOSHASTANDARDSFOR CONSTRUCTION LOADS CONSTRUCTION INDUSTRY (29 CFR PART a926). RISER TO BE PROVIDED BY ao. CONTRACTOR SHALL PROVIDE ADEQUATE STONE BACKFILL FOR THE UNDERGROUND DETENTION SYSTEM PIPES IN FOR TEMPORARY CONSTRUCTION VEHICLE LOADS, AN EXTRA AMOUNT OF COMPACTED COVER MAY BE REQUIRED OVER CONTRACTOR. ACCORDANCE WITH THE MANUFACTURER's REQUIREMENTS. THE TOP OF THE PIPE. THE HEIGHT -OF -COVER SHALL MEET THE MINIMUM REQUIREMENTS SHOWN IN THE TABLE BELOW. GENERAL CONSTRUCTION SEQUENCE NARRATIVE THE USE OF HEAVY CONSTRUCTION EQUIPMENT NECESSITATES GREATER PROTECTION FOR THE PIPE THAN FINISHED CONNECTION DETAIL 2. THE CONTRACTOR SHALL ASSEMBLE CONSTRUCTION MATERIALS ON -SITE, MAKING SURE THEY MEET DESIGN GRADE COVER MINIMUMS FOR NORMAL HIGHWAY TRAFFIC. SPECIFICATIONS AND ARE PREPARED AT STAGING AREAS WHEN POSSIBLE. K3BBS) 3. THE CONTRACTOR SHALL CLEAR AND STRIP THE PROJECT AREA IF REQUIREDTO THE DESIRED SUB -GRADE. 4. CONTRACTOR SHALL EXCAVATE THE TRENCH. S. THE TRENCH FOR THE UGD SYSTEM SHALL EXTEND 3'BEYOND THE PIPES'SPRINGLINES. 6. CONTRACTOR SHALLWRAPTHE EXCAVATED TRENCH WITH A60UNCE FILTER FABRICCLOTH. ASUITABLE FOUNDATION SHALL BE BENEATH THE TRENCH's FILTER CLOTH. 7. TRENCH TO INCLUDE A 6"#57 STONE BED AT 95% COMPACTION BENEATH THE STORM PIPES. 8. CONTRACTOR SHALL INSTALL THE UGD DETENTION SYSTEM, INCLUSIVE OF THE OUTFALLS AND ALL OF THE ASSOCIATED STRUCTURES. 2 2/3"x1/2" RE -ROLLED END HEL-COR PIPE TRENCH SHALL BE BACKFILLED WITH COMPACTED#57 STONE IN B" LIFTS AND SHALL EXTEND 6" VERTICALLY ABOVE THE CROWN OF THE PIPES. GENERAL NOTES: ao. THE TOP OFTHE #57 STONE SHALL BE COVERED WITH A 6 OUNCE FILTER FABRIC CLOTH, OVERLAPPING THE PREVIOUSLY INSTALLED CLOTH THAT SURROUNDS THE BOTTOM AND SIDES OFTHE TRENCH. 1. JOINT IS TO BE ASSEMBLED PER AASHTO BRIDGE CONSTRUCTION SPECIFICATION SEC 26.4.2.4. 22. SUITABLE FILL REACHING THE FINISHED GRADE SHALL BE APPLIED ABOVE THE TOP LAYER'S FILTER CLOTH, MEETING MINIMUM PIPE MANUFACTURER'S REQUIREMENTS TO PREVENT FLOATATION AND ENSURING PIPE INTEGRITY IS MAINTAINED I 0 CMP RISER N w IL 0 -0B 11"TYP. (9N SECTION VIEW ACCESS CASTING NOT SUPPLIED BY CONTECH c: 0 A �B #4 DIAGONAL TRIM BAR TYP. 4 PLACES SEE NOTE T I 2, BAND MATERIALS AND/OR COATING CAN VARY BY LOCATION. CONTACT YOUR CONTECH REPRESENTATIVE FOR AVAILABILITY. -. A MINIMUM COVER OF 28" IS REQUIRED ABOVE THE CROWN OF THE DETENTION SYSTEM's PIPES. THE MINIMUM 6" AXLE LOADS PIPE SPAN, INCHES (WPs) 18-50 1 50-75 1 75-110 1 110-150 MINIMUM COVER (FT) 2.0 2.5 3.0 3.0 12-42 48-72 3.0 3.0 3.5 4.0 78A20 3.0 3.5 4.0 4.0 126-144 3.5 4.0 4.5 4.5 OF#57STONE ABOVE THE CROWN OF THE PIPES CAN BE PART OFTHE MINIMUM aB"OFCOVER. *MINIMUM COVER MAY VARY, DEPENDING ON LOCAL CONDITIONS. THE CONTRACTOR MUST PROVIDE THE ADDITIONAL 3. BANDS ARE SHAPED TO MATCH THE PIPE -ARCH WHEN APPLICABLE. a . SEETHE MANUFACTURER'S SPECIFICATIONS FOR ADDITIONAL UNDERGROUND DETENTION SYSTEM 3 REQUIREMENTS. COVER REQUIRED TO AVOID DAMAGE TO THE PIPE. MINIMUM COVER IS MEASURED FROM THE TOP OF THE PIPE TO THE TOP OF THE MAINTAINED CONSTRUCTION ROADWAY SURFACE. 4. BANDS ARE NORMALLY FURNISHED AS FOLLOWS: INSPECTIONS DURING CONSTRUCTION: • 12"THRU 48"1-PIECE CONSTRUCTION INSPECTIONS ARE CRITICAL TO ENSURE THE UNDERGROUND DETENTION SYSTEM IS PROPERLY BUILT. • 54"THRU 96" 2-PIECES BECAUSE THE TIMING OFTHE INSTALLATION IS DICTATED BYTHE CONTRACTOR,THE CONTRACTOR SHALL BE CONSTRUCTION LOADING DIAGRAM • 102"THRU 144"$-PIECES RESPONSIBLE FOR CONTACTING THE ENGINEER, COUNTY INSPECTOR AND CONTECH REPRESENTATIVE PRIOR TO INSTALLATION. CONTECH, OR AN EQUIVALENT PIPE MANUFACTURER, SHALL BE CONTACTED WELL AHEAD OF THE NOT TO SCALE CONSTRUCTION START DATE TO ENSURE ADEQUATE LEAD TIME FOR MATERIALS AND DELIVERY. MULTIPLE SITE VISITS 5. BAND FASTENERS ARE ATTACHED WITH SPOT WELDS, RIVETS OR HAND WELDS. AND INSPECTIONS ARE REQUIRED TO BE SCHEDULED BY THE CONTRACTOR, WITH THE ENGINEER, COUNTY INSPECTOR & PIPE MANUFACTURER, DURING THE FOLLOWING STAGES OF THE UNDERGROUND DETENTION SYSTEM 8. ALL CMP IS REROLLED TO HAVE ANNULAR END CORRUGATIONS OF 2 2/3"xl/2" CONSTRUCTION PROCESS: 2. PRE -CONSTRUCTION MEETING 7. DIMENSIONS ARE SUBJECT TO MANUFACTURING TOLERANCES, 2. INITIAL SITE PREPARATION (INCLUDING INSTALLATION OF PROJECT E&S CONTROLS) 3. EXCAVATION/GRADING(E.G., INTERIM/FINAL ELEVATIONS). 8- ORDER SHALL DESIGNATE GASKET OPTION, I F REQUIRED(SEE DETAILS ABOVE). 4 HENTHE DETENTION PIPE SUBGRADE IS READY FOR PIPE CONSTRUCTION, BUT BEFORE STONE BEDDING IS SPECIFICATION FOR CORRUGATED STEEL PIPE -ALUMINIZED TYPE 2 STEEL H-12 HUGGER BAND DETAIL 5 AFTER STONE BEDDING IS PLACED AND COMPACTED, BUT PRIOR TO PIPE INSTALLATION. 6. ATTHE TIME OFTHE PIPE INSTALLATION. SCOPE HANDLING AND ASSEMBLY 7. AFTER PIPE INSTALLATION, BUT PRIOR TO PLACING BACKFILL& FILL OVER THE SYSTEM. NOT TO SCALE 8. FINAL INSPECTION (DEVELOPA PUNCH LISTFOR FACILITY ACCEPTANCE) THIS SPECIFICATION COVERS THE MANUFACTURE AND SHALL BE IN ACCORDANCE WITH RECOMMENDATIONS OF THE INSTALLATION OF THE CORRUGATED STEEL PIPE (CSP) DETAILED IN NATIONAL CORRUGATED STEEL PIPE ASSOCIATION (NCSPA) 20 MIL PE PLEASE ALSO SEE BELOW, UNDER FACILITY MAINTENANCE, FOR REQUIRED INSPECTIONS AFTER INSTALLATION IS THE PROJECT PLANS. IMPERMEABLE COMPLETE. INSTALLATION LINER OVER INSPECTIONS & MAINTENANCE AFTER CONSTRUCTION: MATERIAL TOP OF PIPE LIMITS OF THE FOLLOWING MAINTENANCE TASKS SHALL BE PERFORMED BYTHE CONTRACTOR IN THE FIRST YEAR FOLLOWING SHALL BE IN ACCORDANCE WITH AASHTO STANDARD (IF REQUIRED) REQUIRED THE INSTALLATION OFTHE UNDERGROUND DETENTION SYSTEM. THE ALUMINIZED TYPE 2 STEEL COILS SHALL CONFORM TO THE SPECIFICATIONS FOR HIGHWAY BRIDGES, SECTION 26, DIVISION I BACKFILL a. FOR THE FIRST YEAR FOLLOWING CONSTRUCTION, THE SITE SHALL BE INSPECTED BYTHE CONTRACTOR APPLICABLE REQUIREMENTS OF AASHTO M274 OR ASTM A929. OR ASTM A798 AND IN CONFORMANCE WITH THE PROJECT PLANE QUARTERLY AND AFTER STORM EVENTS THAT EXCEED 2/2 INCH OF RAINFALL. AND SPECIFICATIONS. IF THERE ARE ANY INCONSISTENCIES OR 36"TYP. 36"SEE TYPICAL 2. THE CONTRACTOR SHALL LOOK FOR BARE OR ERODING AREAS IN THE CONTRIBUTING DRAINAGE AREAAND AROUND THE UNDERGROUND DETENTION SYSTEM AND MAKESURETHEYAREIMMEDIATELYSTABILIZED. PIPE CONFLICTS THE CONTRACTOR SHOULD DISCUSS AND RESOLVE T120"T3YP. BACKFILL DETAIL CONTRACTOR SHALL SPOT RESEED AS NECESSARY AND ENSURE ADEQUATE SITE COVERAGE IS PROVIDED WITHIN WITH THE SITE ENGINEER. NOTES THE FIRSTYEAR. ATTHE QUARTERLY INSPECTIONS, AND AFTER EACH RAINFALL EVENT IN EXCESS ON -,THE THE CSP SHALL BE MANUFACTURED IN ACCORDANCE WITH THE _ CONTRACTOR SHALL PERFORM THE ANNUAL MAINTENANCE TASKS DESCRIBED BELOW IN #3. APPLICABLE REQUIREMENTS OF AASHTO M36 OR ASTM A760. THE IT IS ALWAYS THE RESPONSIBILITY OF THE CONTRACTOR TO AFTER THE FIRSTYEAR THE OWNER SHALL PERFORM FOLLOW-UP INSPECTIONS ANNUALLY, AND AFTER EACH PIPE SIZES, GAGES AND CORRUGATIONS SHALL BE AS SHOWN ON FOLLOW OSHA GUIDELINES FOR SAFE PRACTICES. SIGNIFICANT RAINFALL EVENT: THE PROJECT PLANS. TYPICAL SECTION VIEW 3. A SPRING MAINTENANCE INSPECTION AND CLEANUP SHALL BE CONDUCTED ANNUALLY. THE MAINTENANCE PROGRAM FOR THE UNDERGROUND DETENTION SYSTEM SHALL INCLUDE CLEANING ITANNUALLY OFTRASH, ALL FABRICATION OF THE PRODUCT SHALL OCCUR WITHIN THE ALL FA RICATISTATES. NOT TO SCALE DEBRIS& SEDIMENT AND ENSURING THE INTEGRITY OF THE TRASH RACKS AND OUTFALL& INFLOW PIPES. THE OWNER SHALL ENSURE THE SYSTEM IS OPERATING AS INTENDED AND IS NOT CLOGGED OR DAMAGED. THE OWNER SHALL IMMEDIATELY CLEAN & REPAIR THE FACILITY AS NECESSARY AND SHALL PAY SPECIAL ATTENTION TO THE INLET AND OUTLET LOCATIONS. THE ACCESS MANHOLES SHALL BE USED FOR INSPECTION AND NOTE: IF SALTING AGENTS FOR SNOW AND ICE REMOVAL ARE USED ON OR NEAR THE MAINTENANCE. PROJECT, A GEOMEMBRANE BARRIER IS RECOMMENDED WITH THE SYSTEM. THE MATERIAL SPECIFICATION GEOMEMBRANE LINER IS INTENDED TO HELP PROTECT THE SYSTEM FROM THE POTENTIAL ADVERSE EFFECTS THAT MAY RESULT FROM A CHANGE IN THE NOT TO SCALE SURROUNDING ENVIRONMENT OVER PERIOD OF TIME. PLEASE REFER TO THE BACKFILL REQUIREMENTS FOLLOW THE GUIDELINES OF AASHTO LRFD BRIDGE DESIGN (SEC 12)AND CONSTRUCTION (SEC 26) 1 MINIMUM TRENCH WIDTH MUST ALLOW ROOM FOR PROPER COMPACTION OF HAUNCH MATERIALS UNDER THE PIPE. THE MINIMUM TRENCH WIDTH (12.6.6.1): PIPEs 12": D + 16" PIPE > 12": 1.51D + 12" la MINIMUM EMBANKMENT WIDTH (IN FEET) FOR INITIAL FILL ENVELOPE (12.6.6.2): PIPE < 24": 3.0D PIPE 24"-144 D+4'0" PIPE > 144": D + 10'0" 2 THE FOUNDATION UNDER THE PIPE AND SIDE BACKFILL SHALL BE ADEQUATE TO SUPPORT THE LOADS ACTING UPON IT (26.5.2). 3 BEDDING MATERIAL SHALL BE A RELATIVELY LOOSE MATERIAL THAT IS ROUGHLY SHAPED TO FIT THE BOTTOM OF THE PIPE, AND A MINIMUM OF TWICE THE CORRUGATION DEPTH IN THICKNESS, WITH THE MAXIMUM PARTICLE SIZE OF ONE-HALF OF THE CORRUGATION DEPTH (26.3.8.1, 26.5.3). 4 CORRUGATED STEEL PIPE (CSP / HEL-COR). 5 HAUNCH ZONE MATERIAL SHALL BE HAND SHOVELED OR SHOVEL SLICED INTO PLACE TO ALLOW FOR PROPER COMPACTION (26.5.4). 5a INITIAL BACKFILL FOR PIPE EMBEDMENT TO MEET AASHTO A-1, A-2 OR A-3 CLASSIFICATION, OR APPROVED EQUAL, COMPACTED TO 90% STANDARD PROCTOR (T 99). MAXIMUM PARTICLE SIZE NOT TO EXCEED 3" (12.4.1.2). ALL LIFTS PLACED IN A CONTROLLED MANNER. IT IS RECOMMENDED THAT LIFTS NOT EXCEED AN 8" UNCOMPACTED LIFT HEIGHT TO PREVENT UNEVEN LOADING, AND THE LESSER OF 1/3 THE DIAMETER OR 24" AS THE MAXIMUM DIFFERENTIAL SIDE -TO -SIDE (26.5.4). 6 INITIAL BACKFILL ABOVE PIPE MAY INCLUDE ROAD BASE MATERIAL (AND RIGID PAVEMENT IF APPLICABLE). SEE TABLE ABOVE. 6a TOTAL HEIGHT OF COMPACTED COVER FOR CONVENTIONAL HIGHWAY LOADS IS MEASURED FROM TOP OF PIPE TO BOTTOM OF FLEXIBLE PAVEMENT OR TOP OF RIGID PAVEMENT (12.6.6.3). 7 FINAL BACKFILL MATERIAL SELECTION AND COMPACTION REQUIREMENTS SHALL FOLLOW THE PROJECT PLANS AND SPECIFICATIONS PER THE ENGINEER OF RECORD (26.5.4.1). NOTES: • GEOTEXTILE SHOULD BE CONSIDERED FOR USE TO PREVENT SOIL MIGRATION INTO VARYING SOIL TYPES (PROJECT ENGINEER). • FOR MULTIPLE BARREL INSTALLATIONS THE RECOMMENDED STANDARD SPACING BETWEEN PARALLEL PIPE RUNS SHALL BE PIPE DIAJ2 BUT NO LESS THAN 12", OR 36" FOR PIPE DIAMETERS 72" AND LARGER. • CONTACT YOUR CONTECH REPRESENTATIVE FOR NONSTANDARD SPACING (TABLE C12.6.7-1). TYPICAL BACKFILL DETAIL NOT TO SCALE 811 2'-6" PIPE 0 PLAN FRONT 48"0 to 90"0 FITTING REINFORCEMENT MAY BE REQUIRED BASED ON HEIGHT OF COVER AND LIVE LOAD CONDITION TYPICAL MANWAY DETAIL NOT TO SCALE 3/4 (#6) REBAR CAN E TO OUl (BAR LENGTH = 16%q EXTEND BEY I VL CENTEI RI �1 4 � - OPENING IN PROTECTION -- SLAB FOR ACCESS INTERRUPTED BAR REPLACEMENT, SEE NOTE 6. 2Yz" ALL STEEL PER ° ASTM A36 L FABRICATION TOLERANCE: *,V4" ° FLAT BAR AND REBAR: MILL TOLERANCE APPLIES 7/" HOLE w/ 3/4" REBAR RUNG, WELD REBAR TO RUNG ON OUTSIDE OF STEEL RAIL 0 2Y2" x 3/" FLAT BAR SIDE RAIL PLAN SIDE NOTES: 1. LADDERS CAN BE MADE IN 20'-0" STANDARD LENGTHS AND CUT TO FIT 2. ALL MATERIAL TO MEET ASTM A36 3. LADDER TO BE HOT DIPPED GALVANIZED PER ASTM A-123 AFTER FABRICATION IS COMPLETE STANDARD LADDER DETAIL NOT TO SCALE PART NO. HALAGVL16 PROVIDE MINIMUM OF 4 ATTACHMENT ANGLES (2 ON EITHER SIDE OF LADDER RAIL) TO CONNECT LADDER TO RISER EXTENSION RISER w/ LADDER AND STEPS IF EXTENSION IS REQUIRED RISER w/ LADDER AND STEPS MAINLINE CMP 22/3 x Y2, 5 x 1, 3 x 1, ETC. NOTE: THIS DRAWING IS INTENDED TO APPLY TO LADDERS INSTALLED IN RISERS HAVING A DIAMETER OF 30" OR LARGER. DUE TO SPACE CONSTRAINTS AND LIMITED ACCESSIBILITY, THE PRACTICALITY AND SUITABILITY OF UTILIZING RISERS SMALLER THAN 30" DIAMETER AND/OR INCORPORATING LADDERS IN THESE SMALLER DIAMETER RISERS SHOULD BE ADDRESSED BY THE OWNER AND PROJECT ENGINEER L5" x 3" xy" x 16" LONG AT V-0" SPACING. LONG LEG TO PROJECT OUT. WELD TOP V-6" AND BOTTOM OF 3" LEG TO EACH MAX, CORRUGATION CREST (THESE ANGLES SHOULD BE USED a_ FOR LARGER DIAMETER IL FOR WHERE ADDITIONAL STEPS ARE NEEDED) tc; #4 DIAGONAL TRIM BAR (TYP. 4 PLACES), - SEE NOTE 7. 2" COVER (T,P) _ 1\ " �l I OPENING IN PROTECTION SLAB FOR ACESS STANDARD STANDARD REINFORCING, REINFORCING, SEE TABLE SEE TABLE ROUND OPTION PLAN VIEW NOTES: 1. DESIGN IN ACCORDANCE WITH AASHTO, 17th EDITION AND ACI 350. 2. DESIGN LOAD HS25. 3. EARTH COVER = V MAX. 4. CONCRETE STRENGTH = 4,000 psi 5. REINFORCING STEEL = ASTM A615, GRADE 60. 6. PROVIDE ADDITIONAL REINFORCING AROUND OPENINGS EQUAL TO THE BARS INTERRUPTED, HALF EACH SIDE. ADDITIONAL BARS TO BE IN THE SAME PLANE. *NOTE: WHEN RISER EXTENSIONS ARE USED, THE PLANT SHOULD CUT 3" FROM THE SIDE RAILS AS SHOWN *3" FROM BOTTOM OF LADDER 10 RAIL TO RISER JOINT L *3" FROM TOP OF LADDER RAIL TO RISER JOINT FO LADDER RAILS AND RUNGS (2)Y4" FILLET WELDS 1" LONG ATTACHMENT ANC MINIMUM OF 4 ANGLES P LADDER SECTION, (2 EACH SIDE LADDER) 6' MAX. SPACI VERTICAL 6" FROM RUNG TO RISER JOINT 6" FROM RUNG TO RISER JOINT SECTION A -A RISER LADDER DETAIL NOT TO SCALE RISER NORMALLY CMP WITH 22/3' x )2" CORRUGATIONS (4)Y6" FILLET WELDS FROM EACH ANGLE TO CORRUGATION CREST (2 WELD EACH SIDE) L3"x3"x 16" 5Y" LONG REINFORCING TABLE "BEARING O CMP A B 0 REINFORCING PRESSURE RISER (PSF) 24" 4'0 26" #5 @ 10- OCEW 2,540 4'x4' #5 @ 10" OCEW 1,900 30" 4'-6"0 32" #5 @ 10" OCEW 2,260 4'-0" x 4,-6" #5 @ 9" OCEW 1,670 36" 5'0 38" #5 @ 9" OCEW 2,060 5' x 5' #5 @ 8" OCEW 1,500 42" 5'-6"0 #5 @ 8" OCEW 1,490 5'-6" x 5'-6" #5 @ 8" OCEW 1,370 48" 60 S0" #5 @ 7" OCEW 1,210 6' x 6' #5 @ 7" OCEW 1,270 A INTERRUPTED E REPLACEMENT, SEE NOTE 6. SQUARE OPTION PLAN VIEW 7. TRIM OPENING WITH DIAGONAL #4 BARS, EXTEND BARS A MINIMUM OF 12" BEYOND OPENING, BEND BARS AS REQUIRED TO MAINTAIN BAR COVER. 8. PROTECTION SLAB AND ALL MATERIALS TO BE PROVIDED AND INSTALLED BY CONTRACTOR. 9. DETAIL DESIGN BY DELTA ENGINEERS, ARCHITECTS AND LAND SURVEYORS, ENDWELL, NY. MANHOLE CAP DETAIL NOT TO SCALE (4)y6" FILLET WELDS FROM EACH ANGLE CORRUGATION CREST (2 WELDS EACH SIDE) (4) L3" x 3" x 3/16" 5Y2" LONG (2)Y4" FILLET WELDS 1" LONG FROM EACH ANGLE TO LADDER RAIL LADDER RAILS AND RUNGS -_ _-A (4)Y16" FILLET WELDS FROM EACH ANGLE TO CORRUGATION CREST (2 WELDS EACH SIDE) L3" x 3" x yl6" Sy" LONG Afty/r1141\ LADDER AND RUI SCOTT/R. CII�LLINSZ Lic. No. 035791,a p 5/31/22 z O 2 H w Z DO O 0 _J Z J O Q Y/ z w rY W ce 0) I\ / E"� M V N M ~� I 1 N I � O (LL� W N v LIB > ILL! J ZJ Q W J W L)i url z W z w z O z W � Y U cl� ~ WLn Q G Lij zNw J 0 U) J w � w O J O O ® O N F P JOB NO. 182150 SCALE AS SHOWN SHEET NO ON 450 PROPOSED LEVEL SPREADER 'B' & VEGETATED FILTER STRIP DETAIL J LLJ W W w� z Z_ Q W a D 0 Z 445 )7t7/ 77 777 :�o nE I 0 _W } CIO cl z _j z Z Z z z 445 STR:CO11 CLEANOUT oo < r STA. 2+20.70 _ rn r- 0 } O Q 0) o z (0z z z H) TP=448.00 40 DD 04 0 � D >_< Do 0 ¢ Q o ¢ 0 INV IN: 430.05 TO 4 �� a 0 o 0 F-Do 0 r 0 0 0 INV OUT: 430.05 TO YD10 0 N(o'v r (DN ON 440 } • N of Oo 0 0 0� o� 440 Qj °0 �ON r 00 N(D } > N M } } O°° STR:4 VDOT 48" MH N Nam z +��� oo C0 C6N LO 00N 0) In nO co o ri o) w� CN STA. 0+19.25 } K)NZ� ,)o"t °° 4004 o0 o'rJ n DD °N°oln� 00 Ln n�4� TP=447.09 Qj- Zz `n CO r-U) +Q LO IaLO� .. ~ 0 +O1 00 +a 0 INV IN: 431.25 TO 6 0 NaZZ 0 a4ZO r ��z } + (D zp } I�4_0 435 INV OUT: 432.15 TO 2 INV OUT: 431.15 TO C011 N �a>o Nr__ F-Q_ (nH zZ of N a 11 N�z d tea» 435 E_ N N Nazz m (n E-zz STR: YD3 18" YARD DRAIN INLET STA. 7+99.89 TP=429.50 430 INV IN: 421.25 TO YD4 430 12" HDPE 220.70 LF 00.507. INV OUT: 421.25 TO YD2 E V T E ST T 12" HDPE 425 A T E 57.19 LF ®5.33% 12" HDPE 425 92.2 I LF ® 0.50% 80.96 12" HDPE LF ®0.50% 12" HDPE i, O1 LF ® 0.50% P 2P rB/ F 12" HDPE12 "90.87 HDPE 420 ZX - -4 vQ 63.53 LF ®0.50% 57.34 LF ® 0.50% 12" HDPE 54.73 LF ® 0.50% 432g 420 415 415 STR: YD2 - - - 18" YARD DRAIN INLET _ STA. 8+44.73 12" HDPE TP=409.50 44.84 LF INV IN: 404.50 TO YD3 410 FILL• TYP. ® 37.35% INV IN: 404.50 TO YD12 410 INV OUT: 404.50 TO C01 / 405 i 04 405 XISTIN 0 r 0 GRADE 0 p O Z Lo N w � N00 400 12" HDPE 46.84 LF C) 0DooM 0) 0) +� H 400 ® 36.82% op co MZO Hd F_ Z Z (n (n, E- 395 395 NOTE: THE HDPE YARD DRAIN STRUCTURES SHOWN IN THIS PROFILE, LEVEL SPREADER'B' AND THE VEGETATED FILTER STRIP SHALL BE INSTALLED ATTHE TIME OFTHE UNDERGROUND DETENTION SYSTEM B'S CONSTRUCTION. SEE THE ESC SEQUENCE OF PR POSED CONSTRUCTION FOR ADDITIONAL DETAILS CONCERNING THE \ G AIDE 390 TEMPORARY BLOCKAGE PROPOSED IN STR. 4. \ 390 12" HDPE 38.81 LF ® 13.53% 385 381.75'- TOP OF LEVEL SPREADER 385 382.00'- BEGINNING OF LEVEL SPREADER=STR. 21 INV, OUT 380.75'- BOTTOM OF LEVEL SPREADER 380 PROI,IOSEDzz'FLATL VELSPR ADER'B'.LSTO HAVE Al2" DEEPPLUNGE PO L&A6" WIDERIGI LIP.LS 0INCLUDE A 380 DOT CL. AlRIPRA LINING NDASLOPED S( IN.)VDO r CL. Al RIPRAP LINED EMBA qKMENT DOWNS EAM FROM THE IGID LIP EXTEINDI GTO TH FILTER 5 TRIP. ALL RIPRAP 10 INCLUDE FILTE FABRIC L NDERLA MENTS BEAMEN. OF 6"DEEP. P OPOSE iz8'Wx3 UVEGE TED FIL ERSTRI .FILTER TRIP TO BEUNIFORMLY GRADED TO HE SLOPES SHO N TO ENSURE SHEETFLOW BELOW THE LEVEL SPREADER. CON RACTOR TO PREV NT SO L COMP CTION B HEAVY QUIPME T WITH IN THE LIM TS OF TH E FILTER 3TRIP. SE THIS SHEET 375 FOR AC DITIONA FILTER E TRIP DETAILS&D SIGN RE U IREM El ITS. 375 r 0 CO r- r O «� DO r� DC N «� 0) oU h c0 to O 0) c0 0 19 V) cc)r- 0 (D r- 7 0) (0 't N r c0 0 (O 60 M n CO n c0 O) CD LO O n N n I'7 N (O n c0 c0 O n O In [D n N O O 0) * p) N n N N N N M I") 0 I'7 O ro M 0 17 0 M 0 O I-7 O) DO 0+50 1+00 1+50 2+00 2+50 3+00 3+50 4+00 4+50 5+00 5+50 6+00 6+50 7+00 7+50 8+00 8+50 9+00 9+50 10+00 LTixmaev�aana�� �.��:a�:�ra��as.�I�»_T.4aaaxim:�a� Iae��� MAINTENANCE INSPECTIONS: ANNUAL INSPECTIONS SHALL BE CONDUCTED IN THE NON -GROWING SEASON DURING THE FALLAND WINTER MONTHS. INSPECTIONS SHALLTRIGGER MAINTENANCE OPERATIONS, AS REQUIRED. MAINTENANCE OPERATIONS MAY INCLUDE BUT IS NOT LIMITED TO SEDIMENT REMOVAL PERIODIC MOWING REPAIR OFTHE LEVEL SPREADER AND ENSURING A DENSE HEALTHY VEGETATED GROUNDCOVER. MOWING SHALL BE COMPLETED AT LEASTTWICE A YEAR TO PREVENT FURTHER WOODY GROWTH AND SPOT RE -VEGETATION OFTHE FILTER STRIP IS REQUIRED IN ORDER TO MAINTAIN A go% MINIMUM COVERAGE RATE. THE CONTRACTOR SHALL CONDUCT THE INSPECTIONS FOLLOWING THE FIRST YEAR THE PROJECT IS COMPLETED, AND THE OWNER SHALL CONDUCT THE INSPECTIONS THEREAFTER. INSPECTIONS SHALL INCLUDE THE FOLLOWING AT MINIMUM: 1. ENSURE FLOW PATHS ARE NOT SHORT-CIRCUITED IN THE LEVEL SPREADER AND THROUGH THE VEGETATED FILTER STRIP. z. ENSURE DEBRIS AND SEDIMENT HAS NOT ACCUMULATED. 3. CHECK FOR SCOUR AND EROSION WITHIN THE LEVEL SPREADER SYSTEM AND FILTER STRIP. 4. CHECK FOR FOOT OR VEHICULAR TRAFFIC DAMAGE IN THE STONE. S. ENSURE VEGETATIVE DENSITY MEETS OR EXCEEDS go% OF THE FILTER STRIP AREA. IN THE EVENT MAINTENANCE IS REQUIRED DURING THE ABOVE NOTED INSPECTIONS, CORRECTIVE MEASURES SHALL BE COMPLETED IMMEDIATELY. PROFILE SCALES 1"=5' (v) 1"=50'(H) STR. r, -VEGETATED FILTER STRIP Vegetated Filter Strips Planting Requirements Vegetated Filter Strips shall be planted at such a density to achieve a 90% grass/herbaceous cover after the second growing season. Vegetated Filter Strips shall be seeded not sodded. Seeding establishes deeper P 9 P roots, and sod may have muck soil that is not conducive to infiltration (Wisconsin DNR, 2007). The filter strip vegetation shall consist of turf grasses, meadow grasses, other herbaceous plants, shrubs, and trees, as 0 Ion as the rims oat of at least 90 /o coverage with grasses and/or 9 primary 9 9 / other herbaceous plants is achieved. Vegetation at the toe of the filter, where temporary ponding may occur behind the permeable berm, shall be able to withstand both wet and dry periods. The planting areas can be divided into zones to account for differences in inundation and slope. Additionally, the trees selected to be planted shall be 10' on -center and shall be an even mix of River Birch (Betula Nigra), Red Maple (Acer Rubrum) and Sweetgum (Liquidambar Styraciflua). No trees shall be planted within the ACSA easement. LEVEL SPREADER NOTES: 1. FIRST 10- FROM LEVEL SPREADER LIP MUST BE 2% OR LESS. 2. TIE BACK ENDS OF LEVEL SPREADER INTO THE SLOPE TO AVOID SCOURING. 3. CONTRACTOR SHALL NOTIFY COLLINS ENGINEERING A MINIMUM OF a WEEK PRIOR TO THE CONSTRUCTION OF THE LEVEL SPREADER. COLLINS ENGINEERING's PRESENCE IS REQUIRED AT THE TIME OF THE LEVEL SPREADER'S CONSTRUCTION SO THAT THE LEVEL SPREADER's FINAL LOCATION CAN BE FIELD VERIFIED. FINAL LOCATION MAY VARY SLIGHTLY FROM THE APPROVED PLAN IN ORDER TO PRESERVE A LARGE TREE(s). 4. CONTRACTOR SHALL USE A GEOTEXTILE FILTER FABRIC UNDERLAYMENT BELOW THE PROPOSED LEVEL SPREADER STONE. THE GEOTEXTILE FILTER FABRIC SHALL BE TENSAR TX- TRIANGULAR GRID OR EQUIVALENT. S , VA DEOSTORNIWATER DESIGN SPECIFICATION NO.2 SHEET FLOW TO FILTER OR OPEN SPACE KEY LEVEL SPREADER / NITO EXISTING GRADE RIPRAP PLUNGE POOL RIPF(APAPRONXBg "TREATED TIMBERS OR _ CONCRETE LIP In �/Uti LENGTH OF LEVEL SPREADER LIP TO SE BASED ON DESIGN FLOW AND ALLOWABLE VELOGrTY .I TOP OF LEVEL SPREADER SHALL BE FLAT dam, 1-3 IN. COURSE AGGREGATE 1 OR OTHER LINING AS DESIGNED FOR STABILITY PLAN VIEW DIMENSION BASED ON UN IsMJnaED "Ie c E B% p]:1) OR LESS. IF VEGETATED DESIGN DISCHARGE FLTER =T OR DONSEFNFD 1O FEET 0 2' MIN M SPACE FRET ET LESS 3 MIN To'MIN 3 MIN I I 17 IN. DEPTH BASED O >> REQUIRED STONE SIZE - 1- SECTION A -A' Figure 2.4., Level Spreader. Pipe or Chanel Flow to Filter Strip or Frese~4 Conserved Open Space SCALE 1"=30' \ C 4+00-011 _ _ Y138 ��I�Ilft�ll � MATC LSEE EET i6 H_ v / CONTRACTOR SHALL CALL THE COUNTY INSPECTOR & ENGINEERING DEPARTMENT 24-HOURS BEFORE ANY ANTICIPATED CONSTRUCTION ACTIVITIES FOR THE LEVEL SPREADER & VEGETATED FILTER STRIP. THIS IS INCLUSIVE OF WHEN THE SUBGRADE IS READY FOR FILTER FABRIC & STONE PLACEMENT, BUT BEFORE STONE BEDDING & FABRIC ARE INSTALLED. Lic. No. 035791 L 5/31/22 < SEE THIS SHEET FOR A SCALED PROFILE OF / THE YARD DRAINS CONVEYING THE D TREATMENTVOLUME RUNOFF, LEVEL- SPREADER'B'&THEVEGETATED FILTER STRIP. PROPOSED i28' FLAT LEVEL SPREADER'B'. LS TO HAVE A 1.2" DEEP PLUNGE POOL & A 6" WIDE RIGID LIP. LS TO INCLUDE A VDOT CL. Al RIPRAP LINING AND A SLOPED 3' (MIN.) VDOT CL. AI RIPRAP LINED EMBANKMENT DOWNSTREAM FROM THE RIGID LIP EXTENDING TO THE FILTER STRIP. ALL RIPRAP TO INCLUDE FILTER FABRIC UNDERLAYMENTS & BE A MIN. OF 6" DEEP. G 382.00EGINNING OF LEVELS READ / EY\\\ / _ 380.75- BOTTOM OF LEVEL SPREADER / / 0 \ \ %W COt -- _ 381.75- TOP OF LEVEL SPREADER 1 \....� \ 9+00 11 \ I \ 381.501� \ 0-10': MAX. SLOPE= 2% x ZR/1 F4 PROPOSED VARIABLE WIDTH SWM EASEMENT PR RVEEDEP SLOPES, YP. - ---- '� / SLOPE-, 381 0 1-4% / 381. \ \ 8 .65 / LIMITS OF STREAM, TYP. L\ / PROPOSED i28'Wx35L' VEGETATED FILTER STRIP. FILTER STRIP TO BE UNIFORMLY GRADED TO MANAGED STEEP--�_� '\ \ / THE SLOPES SHOWN TO ENSURE SHEET FLOW BELOW THE LEVEL SPREADER. CONTRACTOR TO SLOPES, TYP.-\ \ PREVENT SOIL COMPACTION BY HEAVY EQUIPMENT WITHIN THE LIMITS OF THE FILTER STRIP. SEE THIS SHEET FOR ADDITIONAL FILTER STRIP DETAILS& DESIGN REQUIREMENTS. Table 2.4. Vegetated Filter Strip Materials Specifications Material Specification Quantity Pea Gravel (#8 or ASTM equivalent) or Diaphragm should be 2 feet wide, 1 Gravel where steep (6% +) use clean bank -run foot deep, and at least 2 inches Diaphragm VDOT #I~57 or ASTM equivalent (1-inch below the edge of pavement - maximum). Permeable 40% excavated soil, 40% sand, and 20% pea gravel to serve as the media for the Berm berm. Geotextile material appropriately selected for placement under rip rap or gravel to Filter Fabric effectively separate the stone from the ground below. Engineered Level Spreader lip should be concrete metal timber, or other rigid material-, P P 9 ' Level Reinforced channel on upstream of lip- VDOT EC-3. P P Spreader See Hathaway and Hunt (2006) or Henrico County Program Manual for alternate designs. Erosion Control Where flow velocities dictate, use woven biodegradable erosion control fabric or Fabric or mats that are durable enough to last at least 2 growing seasons. (e.g., VDOT Erosion Control matting EC-3). Matting If existing topsoil is inadequate to support dense turf growth, imported top soil (loamy sand or sandy loam texture), with less than 5% clay content, corrected pH Topsoil at 6 to 7, a soluble salt content not exceeding 500 ppm, and an organic matter content of at least 2% shall be used. Topsoil shaft be uniformly distributed and lightly compacted to a minimum depth of 6 to 8 inches Compost shall be derived from plant material and provided by a member of the Compost U.S. Composting Seal of Testing Assurance (STA) program, as outlined in Stormwater Design Specification No. 4. N w IN 0 LU M V Z N z � C) Q N ce O L W N W > LL (n U,) ZJQ J a LU LU OL9T� 0 z w Z = o LU U Q WI w U a F- FLU :2Ul cn V 1 LLJ Q LU J � I-� _ U 0 O J w ~ W 0 IIIJ a 0 O M 8 N W ILL LU a LE) JOB NO. 182150 SCALE AS SHOWN SHEET NO. 168 I/2" aloe plated hock attached with 9; 8" fastener I/8' dm hole. Isometric pipe 1 4" HOPE p.ela iopllonMD eulve rt „r ul l io wilt• 0 '.RBPP. -1/8" holes Nolan and ["nd li A' Plal- OO manu:octund by Plncii, ? 000 Solutlons Inc or equal 0000 .,ti'�: .... ••, •shown With optional platy RnPF "Inudnrnl plonllr wdh �G•Ct10Q 2-1/8" holes and 1/4- plate manufactured by Plastic 9ulutims Inror equal ..- dia. halo 0 0 o O o 00 0 0 PLA!TIC P9 Xmas DEBRIS CAGE SOLUTIONS Ain1'" 710f11 nlersr Ar INC. 877-877-6727 neymdlc-rat 4.m Perforated EMBANKMENT NOTES: AFTER AN INVESTIGATION OF THE SITE'S SOILS, SITE VISITS, AN ANALYSIS OF THE SURVEYED TOPOGRAPHY AND AN EXAMINATION OF VA DEQ APPENDIX A: EARTHEN EMBANKMENT, THE APPLICANT HAS PROVIDED A COMPREHENSIVE EMBANKMENT DESIGN THAT DOES NOT NEED A GEOTECHNICAL STUDY AT THIS TIME. SUCH 15 THE CASE DUE TO THE PRECAUTIONARY EMBANKMENT DESIGNS PROPOSED. A SUMMARY OF THE EMBANKMENT DESIGN REQUIREMENTS ARE LISTED BELOW, MANDATING THE CONTRACTOR MEET THESE REQUIREMENTS AT MINIMUM. THE EMBANKMENTS SHALL HAVE A COMPACTED CLAY CORE WITH A CUTOFF TRENCH & BE IN ACCORDANCE WITH THE DETAILS SHOWN ON IN THIS PLAN. BERMS AND SPILLWAYS SHALL BE STABILIZED WITH EC-3 MATTING & THE REMAINING DISTURBED SLOPES SHALL BE STABILIZED WITH EC-2 MATTING. ALL BERM FILL MATERIAL SHALL CONSIST OF ML, CL, SC OR GC SOILS & BE FREE OF WOOD, ROOTS, ROCKS OR ANY OTHER NON COMPACTING SOIL. COMPACTED FILL SHALL BE PROCTOR MAXIMUM DRY DENSITY ASTM D698 AND HAVE A MINIMUM OF 95%OF MAXIMUM DRY DENSITY AND 2%OF OPTIMUM MOISTURE CONTENT. ALL FILL MATERIAL AND CONSTRUCTION SHALL BE APPROVED BY AN ONSITE GEOTECHNICAL ENGINEER PRESENT DURING THE CONSTRUCTION OF THE EMBANKMENTS AND FILL AREAS. SECTION A-9: TYPICAL GRAPHICAL DETAILS sl_�Hornogeneous fill 1 I 4' min y� -1 �r�Cut off trench-4' below suitable material Soil or rack L - - - - - - - - - - - J TYPICAL HOMOGENEOUS EMBANKMENT Pipe outlet Coo fib� r collector orOM Slor(S Foundation drain FOUNDATION DRAIN drain Sand, grad or fOL1 .-drain WM sTrtum tion filler CHIMNEY DRAIN toe Transition fill �Roctc or gravel �Btanket drain BLANKET DRAIN RQc-k or gravel drain Transition filter TOE DRAIN SCS Engineering Field Manual Figure &-la. Homogeneous Embankments w/Setpage Controls APPROVED TOND 4' DESIGN CHECK: Treatment Volume for Block 5 &Village Center, Tv (VRRM) 40,144 cf Minimum Treatment Volume Required for Level II Basin 60,216 cf Treatment Volume Provided at MWSE 62,816 cf Minimum Percentage of Tv Provided at MWSE 5000 Percentage of Tv Provided at MWSE 100 Ponding Depth Correspondingto Minimum TV Required 0.0 ft Maximum Ponding Depth allowed for Minimum Tv 4 ft Maximum Percentage of TV Provided above MWSE 50 % Percentage of TV Provided above MWSE 0 % Minimum Forebay Volume Required (15% of TV) 9,032 cf Forebay Volume Provided cf STORMWATER MANAGEMENT FACILITY GRADING 4�11,003 4 _ ✓' Elevation (ft) Area of Forebay Cell Contours (sf) Volume (cf) 358 - - 360 422 0 362 1,155 1,517 364 2,193 4,810 365 3,074 7,431 366 4,095 11,003 368 - - 370 372 Elevation Area of Main Cell Volume (ft) Contours (sf) (cf) 358 3690 0 360 5,293 0 362 7,160 12,406 364 9,290 28,810 365 11,258 39,068 366 14,199 51,768 368 - - 370 372 Elevation Area Contours Volume (ft) (sf) (cf) 358 3690 - 360 5,715 0 362 8,315 13,949 364 11,483 33,662 365 14,332 46,543 366 18,294 62,816 368 29,044 109,742 370 33,823 172,548 372 38,733 245,049 General Construction notes for Stormwater Manaaement Plans 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 erosion control inspector. Sto rm Rax Thl ROUND SERIES TRASH RACK CONCRETE MANHOLE STANDARD 60 INCH RACK SHOWN DIMENSIONS IN INCHES PLAN SIDE VIEW StormRaxT"' Round Series for Concrete Manhole PsrtNo.; Dim A, Dim8_ DMnC MIMID MMOD R544 17 Y4 14 Y. 28 . 24 30 RS-36 21 / 14 3t 40 54 . 36 48 43 57 RS49 n 18 _ RS40 27 % 18 % 66 % 60 70 PlastIc $Oludons, Inc. CUSTOMER �, wy Po Iiox a3B6, VYllxliesrer, VA 22606 238 Md,lxe Rd, 1Wxhesrer, VA 226a3 - :877) 877-5727 phone PROJECT: ;540) 722.2219 fax ht�//www,plas0o-sotudw.mm 110" STRUCTUnAI PUSIIC W PLMTIC SM111045, INC APPROVED WET POND 4 AMENDMENT #4 MODIFICATIONS: 1. THIS PLAN ONLY PROPOSES ONE CHANGE TO THE ORIGINALLY APPROVED 'WET POND 4'. THIS PLAN PROPOSES TO APPR ED RIPRftP LINED PERMANENTLY PLUG (WATERTIGHT) THE PREVIOUSLY / CH NN�EL PR6TECTIOf� j APPROVED SWM ORIFICES, AND REPLACE THEM WITH NEW / �� SWM ORIFICES. ONE (1) NEW 03" LOW -FLOW ORIFICE w/ AN INV.=366.00 & SIX (6) NEW 04" MID -FLOW ORIFICES w/ INV.=369.15' SHALL BE INSTALLED. GENERATE MINIMAL EARTH DISTURBANCES. / / 3. ALL OTHER REMAINING 'WET POND W APPROVED DESIGNS APPROVjED FORE�A SHALL REMAIN. THIS PLAN SIMPLY SHOWS THE ADEQUACIES 10 OMEL =3k0.0. \ OF THE APPROVED'WET POND 4' WITH ITS UPSTREAM VILLAGE CENTER & SALAMANDER STREET. SEE ORIGINAL WPO APPROVED PLAN FOR ADDITIONAL DETAILS (WPO 201700037). / 4. AN ASBUILT SURVEY OF WET POND 4' IS REQUIRED BEFORE THE FULL RELEASE OF THE SWM BOND. APP VED ( B /ERov T SP#LLWAY, v � \ ��\ APPROVED 'WET POND 4' PLAN - A �SCALE 1"=30' { FOREBAY CELL A SCR TEJ.E�3 � 100-YR PEAK WSE 370.9 10 YR PEAK WSF� g'I 2 YR PEAK WSE=3 9.4445 1-YR PEAK WSE= 68. 5 / 0� �� j �60� I I \ O MAIN Ii CELL / �RA NAGE EI45E E T I I APPROVED- / ��ti�� (ENCOMPASSING WE P IN I MWSE=366.00 O PER WP020170Q037�. ( I I I �/i( I I 00 MANAGEDSTEr IAP RCVEDIPOND I I I I I I I I 1p M _! /� SLOPES, TYP. / BOTTO ErV. 358.0' PPI CI 10' WIDE AFETY BEN`Lj,�� RANGING IN ELEVATION BETWEEN I366.20'PERWP�201700037` II 1 \ \ ----- ---.� / / / / / //------! 3 6 & 1 \ \ A PROVED.- WIDETOP DAM ELFIN.=372.0' / AP RC ED 10' WID AQUATIC BEf1CH \ \ N &GIN LE ER PION BETW E7. I \ \ \ 5 1 1 % �APP OVE 3 -WWIDE RIP AP INE EMERGE SPI W CR TE V- / APPROVED 12'WIDE FV 0 37).ACCESS ROAD TFOR TPOND 4IAL / I I I I MAINTENANCE APPROVED'STM X-02' DRAINAGE / I \ STRUCTURE (RIM=372.20, INV IN=362.80, / �/ / 'r i11 I INV. OUT=362.70(LOW-FLOW), INV. APPROVED 'STM X-01' (POND 4 072" RISER) ' OUT=363.60 (PRIMARY FLOW, 60"). / / RIM=369.80 STRUCTURE TO SPLIT FLOW TO PROVIDE / INV OUT=363.30 060" RCP) ADDITIONAL DOWNSTREAM WATER I - QUALITY TREATMENT. SEE WPO !v y (TO BE REPLACED WITH NEW 03" ORIFICE, INV. 366.00) 201700037 FOR DETAILS. �! / i 09" MID FLOW ORIFICE INV�z5 N (TO BE REPLACED WITH (6) SIX NEW 04" MID -FLOW ORIFICES, INV =369.15) l A PROVED LOW -FLOW PIPELA / O (8 .56' @1.5%) DIRECTING A \ / I GRIEENWAY,� P�RTION OF THE RUNOFF TO ) T.p \ PPROVED LEVEL SP03-17. / 1 ` -\ PER WP0201700037. :. TREA P.x / X APPROVED LEVEL SPREADER, / PE� WPO 20/ 700037. APPROVED 69.11' OF 060" RCP = .� = �.-0 AT 1.59% WITH CONCRETE CRADLE TO SERVE AS WET POND 4's BARREL (WPO 201700037). 1 _ -� APPROVED 30' LONG CLASS I - - t✓ RIP -RAP OUTLET PROTECTION / UNDER WPO 201700037. CONSER PO 20 EASEMENT -....., PER N/P02017f10037. \ APPROVED VDOT STD. ES-1 UNDER WPO 20170003T o i a zN aTION Ess 7 REMCvr9LE rOR ACCESS r ± - _ ,1 ISOMETRIC CONCRETE STRUCTURE DIMENSIONS INSIDE STRUCTURE DIMENSION OUTSIDE STRUCTURE DIMENSION AVAILABLE OPTIONS CROSS BRACING FOR OVERHANG HOPE ANTI -VORTEX PLATE DATE DRAVA BY: APPO BY: DETAIL: "y COUNITY OF ALBEMARLE M Department of Community Development Construction Record Drawings (As -built) for VSMP The following is a list of information required on construction record drawings for stormwater facilities (reference Water Protection Ordinance 17-422). b is preferable that the construction record drawing be prepared by someone other than the designer. Please do not provide design drawings as construction record drawings. A. A signed and dated professional seal of the preparing engineer or surveyor. B. The name and address of the firm and individual preparing the drawings on the title sheet. C. The constructed location of all items associated with each facility, and the inspection records to verify proper dimensions, materials and installation. The items include, but are not limited to the following: 1. Inspection Records and photographs for pipe trenches and bedding, including underdrains. 2. Video Pipe Inspection for any pipes which are not accessible or viewable. 3. Updated Location with geo-coordinates of all facilities. 4. Verified Drainage Area neaps for the drainage area treated, and for drainage to the facilities. 5. Current physical and topographic survey for all earthen structures. Ponds should include a survey of the pond bottom. Surveys should verify pond volumes are per design. Corrections may be required for alterations from the design. 6. Plants, location and type. 7. Plans and profiles for all culverts, Pipes, Risers. Weirs and DrainageStructures - Display the installed type of drainage structures, culvert/pipe size, weirs, materials, inlets or end treatment(s), inlet and outlet protection, alignment and invert elevations compared to design. 8. Computations: For significant deviations from design, provide sealed computations verifying that the as -built condition is equivalent or better than design. 9. Ditch Lines - Display the constructed location of all ditch lines and channels, including typical sections and linings. 10. Easements - Show all platted easements with dead book references labeled. Facilities and drainage must be within platted easements. Provide copies of recorded documents. 11. Guardrail, fences or other safety provisions - Display the constructed location of all safety provisions, fences, guardrail, including the type, length and applied end treatments, compared to design. 12. Material layers - bioftlter media, stone layers, sand layers, keyways and cores must be verified ac to material types and depths. Include inspection reports, boring or test pit reports and materials certifications. Biofilter media must be an approved state mix. 13. Access roads - show location of access roads, surface treatment, drainage, etc, as applicable. 14. Compaction reports are required to verify fill compaction in dams. 15. Manufacturers certifications for proprietary BMP's certifying proper installation and functioning. YK6➢Wlr/;49i1010 lt�6� Lic. No. 035791,E P 5,131/22 �� 1O �S11OATAT. oo_1 L v 7 N z a r Q CD n/ O (L.IL� W N V W >_ LU V 1 ZJQ LU W r 0 L9 O Z o z w L 0 w I --I Q W' LU U a H W ULU � H LU U 0 0 J w � OLI) J�o 0 O1..1� O co N I-. Lu - JOB NO. 182150 SCALE AS SHOWN SHEET N0. 17 ,TH OFIT SCOTT R. LLINStZ CU Lic. No. 035791,a 10 �5/31/22 oIONAL Y' w w z z z w z z J O O O C N O U Brookhill Stormwater Quality Summary Table 7W 3 m Required Phosphorous Required Phosphorous O Removal Rate (Ibs/yr) Removal Rate (Ibs/yr) a r a Vl m TBD Z W M 14.17 O z < 'o O Q u U) 3 ^� z W C u K iY \/ w I C 0 1.12 W 0 6.74 `o v Required Phosphorous ° Removal Rate (Ibs/yr) 6 c 30.68 a TBD 0 N U 5.68 Q N m Q M C o U 0 E 0 c J Required Phosphorous o Removal Rate (Ibs/yr) 17.72 IN M w c M J N z > m v TBD o 4 H� Q ° - Q L M 3 Total Required Phosphorous Removal w o a Rate (Ibs/yr) to Date r < V a Required Phosphorous 86.16 ('V z >, Removal Rate (Ibs/yr) Q Q o Total ONSITE ( - o Phosphorous Removal N Rate Provided (Ibs/yr) 10.05 65.19 \Q / v J O o Total OFFSITE c Phosphorous Removal J o Rate Credits (Ibs/yr) L J Purchased to Date \ 12.01 /� J ° W Q a J c Phosphorous Removal 1 �- o Rate Percent Provided O o Notes: o On site to Date J w 1. To date, the total required phosphorous removal rate is 86.16 Ibs/yr and the total phosphorous removal rate achieved through onsite SWM facilities is 65.19 Ibs/yr. This leaves a deficit of 20.97 Ibs/yr (86.16-65.19) that is mitigated through nutrient credit purchases. In 75 7 z accordance with stormwater regulations, the overall Brookhill Development is allowed to use offsite BMPs (e.g. nutrient credit purchases) totalling a maximum of 25%of the overall required required phosphorous removal rate. Q ~- 2. Actual purchased nutrient credits assoicated with the approved plans to date is 12.01 lb/yr. _ QALL 3. Nutrient credits proposed to be purchased with this VSMP Amendment #4 is 8.96 Ibs/yr (20.97-12.01). U �� o LLY U o� W ° w � UT ° Ul CO J J ° J = z Z �z w J O z O w U) = z z .j CO J W OJ ° Q J �o O w\ a I� / ° 0 o O U O M N W °' s U w ° J � V ~ ° L w E O w U a Ln JOB NO. 182150 00 SCALE ° NONE ° N C U SHEET NO. a 19 s Phosphorus Removal Surplus Amount Amount of Offsite Section Block Common Name SWM Facility ID Type of Facility achieved w/proposed plan (Ib/yr) Plan # of Offsite Credits Created (Ib/yr) Credits Purchased (Ib/yr) Percent of Total Development Offsite Credits (%) 1 4A Apartments Pond 11 Wet Pond 4.01 WP0201800051 0 1.27 10.6% 1 4A Apartments DP-4A Detention Pond w/Underground Storage - WP0201800051 1 4A Apartments CDS-4A CDSUnit(ManufacturedDevice) 1.60 WP0201800051 1 4A Apartments LS-11 Sheet flow to open space REMOVED - WP0201800051 1 4B Apartments Pond 11 Wet Pond 0.18 WP0201800051 1 4B Apartments UD-4B Isolator Row (Manufactured Device) 3.38 WP0201800051 1 46 Apartments Pond 4B Extended Detention Pond 0.79 WP0201800051 1 4B Apartments LS-4B Sheet flow to open space 0.74 WP0201800051 1 - ROW Pond 11 Wet Pond 0.18 WP0201800013 0 1.09 9.1% 1 - ROW LS-11 Sheet flow to open space REMOVED - WP0201800013 1 - ROW LS-11 Sheet flow to open space REMOVED - WP0201800013 1 88 ROW and Block8B Pond 10 Wet Pond 5.91 WP0201800080 0.68 1.53 12.7% 1 - ROW LS-10 LS-10 REMOVED - WP0201800080 1 - ROW LS-10 LS-10 - WP0201800080 1 1 3 3 Village Center and Salamander Street Pond 4 LS-4.1 Wet Pond wth Downstream Sheet flow to open space 23.62 WP0201700037 (Amendment #4) 0 0 0.0% 1 3 Village Center LS'B' Sheet flow to vegetated filter strip 717 WP0201700037 (Amendment #4) 0 0 0.0% 1 3 Salamander Street Pond 11 Wet Pond 0.38 WP0201800050 0.08 0 0.0% 1 3 Salamander Street LS-11 Sheet flow to open space REMOVED - WP0201800050 1 8A Senior Living Facility Pond 11 Wet Pond 3.70 WP0201900004 0.01 0 0.0% 1 8A Senior Living Facility LS-11 Sheet flow to open space REMOVED - WP0201900004 Section 1 Master Plan Comparison Section SWM Facility ID Phosphorus Removal proposed w/master plan (Ib/yr) Phosphorus Removal achieved w/proposed plan (Ib/yr) Anticipated Amount of Offsite Credits Purchased (Ib/yr) Anticipated Percent of Total Development Offsite Credits (%) Amount of Offsite Credits Purchased (Ib/yr) Percent of Total Development Offsite Credits (%) 1 Pond 4 Treatment Total 6.77 23.62 1 Pond 7Treatment Total 8.11 TBD 1 Pond lO Treatment Total 6.94 6.59 1 Pond ll Treatment Total 9.68 8.54 1 Pond 4B Treatment Total - 0.79 1 Manufactured Devices Treatment Total 2.62 4.98 1 Infiltration Treatment Total 21.71 0 1 Level Spreader'B' - 7.17 1 Level Spreader 4B 9.74 0.74 Section 1 BMP Treatment Total 65.57 52.43 Section 1 Offsite Nutrient Credits Total 6.8 20.0% 3.89 11% Section Block Common Name SWM Facility ID Type of Facility Phosphorus Removal achieved w/proposed plan (Ib/yr) Plan # Surplus Amount of Offsite Credits Created (Ib/yr) Amount of Offsite Credits Purchased (Ib/yr) Percent of Total Development Offsite Credits (%) 2 9 Townhouses Blk 9 Wet Pond Level II Wet Pond 5.87 WP0201800086 0 2.10 6.2% 2 10 Townhouses Blk 10-UGD Underground Detention (No Water Quality) - WP0201800086 2 11 Townhouses - FYI: A phosphorous removal rate credit from WP0201700037 Amendment #4 is appied to the Blks 9-11 WPO 20200004 plan. This credit is accounted for above in Section 1 and is therefore not shown in Section 2's removal rate summary. - WP0201800086 Section 2 Master Plan Comparison Section SWM Facility ID Phosphorus Removal proposed w/master plan (Ib/yr) Phosphorus Removal achieved w/proposed plan (Ib/yr) Anticipated Amount of Offsite Credits Purchased (Ib/yr) Anticipated Percent of Total Development Offsite Credits (%) Amount of Offsite Credits Purchased (Ib/yr) Percent of Total Development Offsite Credits (%) 2 Pond l2 Treatment Total 8.06 - 2 Sheet Flow to Open Space Treatment Total 1.67 - 2 elk 9 Wet Pond - 5.87 2 Blk 10-UGD - - 2 Credit Appied from WP0201700037 Amendment #4 - Section 2 Treatment Total 9.73 5.87 Section 2 Nutrient Credits Total 6.8 20.0% 2.10 6.2% Section Block Common Name SWM Facility ID Type of Facility Phosphorus Removal achieved w/proposed plan (Ib/yr) Plan # Surplus Amount of Offsite Credits Created (Ib/yr) Amount of Offsite Credits Purchased (Ib/yr) Percent of Total Development Offsite Credits (%) 3 13 TBD TBD TBD TBD TBD TBD TBD TBD 3 13 TBD TBD TBD TBD TBD TBD TBD TBD 3 12 TBD TBD TBD TBD TBD TBD TBD TBD Section 3 Master Plan Comparison Section SWM Facility ID Phosphorus Removal proposed w/master plan (Ib/yr) Phosphorus Removal achieved w/proposed plan (Ib/yr) Anticipated Amount of Offsite Credits Purchased (Ib/yr) Anticipated Percent of Total Development Offsite Credits (%) Amount of Offsite Credits Purchased (Ib/yr) Percent of Total Development Offsite Credits (%) 3 Pond l3A Treatment Total 9.13 TBD 3 Sheet Flow to Open Space Treatment Total 5.95 TBD Section 3 Treatment Total 15.OS TBD Section3Nutrient Credits Total 6.8 20.0% TBD TBD Section Block Common Name SWM Facility ID Type of Facility Phosphorus Removal achieved w/proposed plan (Ib/yr) Plan # Surplus Amount of Offsite Credits Created (Ib/yr) Amount of Offsite Credits Purchased (Ib/yr) Percent of Total Development Offsite Credits (%) 4 14 TBD TBD TBD TBD TBD TBD TBD TBD 4 14 TBD TBD TBD TBD TBD TBD TBD TBD 4 14 TBD TBD TBD TBD TBD TBD TBD TBD Section 4 Master Plan Comparison Section SWM Facility ID Phosphorus Removal proposed w/master plan (Ib/yr) Phosphorus Removal achieved w/proposed plan (Ib/yr) Anticipated Amount of Offsite Credits Purchased (Ib/yr) Anticipated Percent of Total Development Offsite Credits (%) Amount of Offsite Credits Purchased (Ib/yr) Percent of Total Development Offsite Credits (%) 4 Pond l3A Treatment Total 14.05 TBD 4 Sheet Flow to Open Space Treatment Total 0.04 TBD Section 4 Treatment Total 14.09 TBD Section 4 Nutrient Credits Total 6.8 20.0% TBD TBD Section Block Common Name SWM Facility ID Type of Facility Phosphorus Removal achieved w/proposed plan Plan # SurplusAmount of Offsite Credits Amount of Offsite Credits Purchased Percent of Total Development