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HomeMy WebLinkAboutWPO201600034 Plan - Revision 2020-07-07CEIVER L _NOTES. OWNER WRIGHT 104, LLC 707 EAST JEFFERSON STREET CHARLOTTESVILLE, VA 22902 ENGINEER COLLINS ENGINEERING 200 GARRETT STREET, SUITE K CHARLOTTESVILLE, VA 22902 434.293.3719 TAX MAP PARCELS & NUMBER OF POSSIBLE LOTS T.M.P. 89-25 44.87 ACRES + 5 DEV. LOTS T.M.P. 101-2 45.85 ACRES + 0 DEV. LOTS T.M.P. 101-2A1 45.85 ACRES + 5 DEV. LOTS T.M.P. 101-213 5.70 ACRES + 1 DEV. LOT T.M.P. 101-2C 6.49 ACRES + 1 DEV. LOT 148.76f ACRES + 12 DEV. LOTS = 12 DEV. LOTS + 5 (21 ACRES) TOTAL POSSIBLE LOTS= 17 LOTS* *LOTS MAY NOT BE FURTHER SUBDIVIDED & THERE SHALL ONLY BE ONE DWELLING PER LOT ACCESS LOTS 1-16 & RURAL PRESERVATION TRACT A SHALL ONLY HAVE ACCESS VIA GREENLOFT FARM CT. ZONING RURAL AREA (PER COUNTY GIS, THESE LOTS DO NOT LIE IN AN AGRICULTRUAL-FORESTAL DISTRICT) / Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y PRE CONSTRUCTION CONDITIONS SITE WAS BEEN TIMBERED, EXISTING RIPRAP DITCHES AND DIRT/GRAVEL Y DRIVEWAYS EXISTED ON THE PROPERTY. THE REMAINING PORTION OF THE SITE WAS WOODED. Y EXISTING CONDITIONS SITE CURRENTLY CONSISTS OF A TWO LANE RESIDENTIAL ROAD WITH SUBDIVIDED Y LOTS. A FEW OF THE LOTS CURRENTLY CONTAIN CONSTRUCTED RESIDENCES. PROPOSED USE 16 SINGLE FAMILY RESIDENTIAL LOTS AREAS SINGLE FAMILY RESIDENTIAL LOTS= 77.40 ac. RURAL PRESERVATION TRACT A= 70.28 ac. SPECIAL LOT (FOR PROPOSED LOW -IMPACT DETENTION FACILITY)= 1.08 ac. BUILDING HEIGHTS 35' MAXIMUM SETBACKS: FRONT - 25' MINIMUM (75' IF ALONG STATE HIGHWAY) SIDE - 25' MINIMUM REAR - 35' MINIMUM SUBDIVISION STREETS PRIVATE ROAD WITH ROADSIDE DITCHES DATUM VIRGINIA SOUTH- SPC GRID 3 TOPOGRAPHY H TOPOGRAPHY OF THE SITE WAS PROVIDED BY LOUISA AERIAL SURVEYING IN MARCH OF 2012 AFTER INITIAL MASS GRADING. THE TOPOGRAPHY WAS SUPPLEMENTED WITH ASBUILT DATA IN MARCH OF 2018. ASBUILT DATA WAS PREFORMED BY A LICENCED LAND SURVEYOR AT ROUDABUSH GALE & ASSOCIATES. TOPOGRAPHY OUTSIDE OF THE PROPOSED DEVELOPMENT IS IN ACCORDANCE WITH COUNTY GIS DATA. THE SITE WAS FIELD VERIFIED ON JUNE 8, 2020 BY COLLINS ENGINEERING. BOUNDARY BOUNDARY DATA FOR TMP 101, PARCELS 2, 2A1, 2B & 2C, WERE TAKEN FROM RECORDED PLATS PERFORMED BY ROGER W RAY & ASSOCIATES, INC. BOUNDARY DATA FOR TMP 89, PARCEL 25, WAS TAKEN FROM RECORDED PLATS OF THE ADJACENT PROPERTIES, ROTATED TO GRID NORTH BY ROGER W RAY & ASSOCIATES, INC. BENCHMARK A PERMANENT BENCHMARK IS CURRENTLY BEING STAKED. CRITICAL SLOPES CRITICAL SLOPES EXIST ON THE SUBJECT PROPERTY WHERE SHOWN ON THE PLANS. CRITICAL SLOPES ARE PER COUNTY GIS. BURIAL SITES THERE ARE NO KNOWN GRAVES OR MARKINGS OF A PLACE OF BURIAL ON THE PROPERTY. WATERSHED TMP 89-25 & 101-2 ARE LOCATED IN THE NORTH FORK HARDWARE RIVER & MOORES CREEK WATERSHEDS. TMP 101-2A1, 101-213 & 101-2C ARE LOCATED IN THE NORTH FORK HARDWARE RIVER WATERSHED. THESE PARCELS DO NOT EXIST IN A WATER SUPPLY WATERSHED. PER COUNTY GIS, THESE LOTS DO NOT LIE WITHIN A DAM BREAK INUNDATION ZONE. FLOODPLAIN NO FLOODPLAIN EXISTS ON LOTS 1-16 & THE PRESERVATION TRACT A, PER FEMA MAP #5100060405D, DATED FEBRUARY 4, 2005. STREAM BUFFERS STREAM BUFFERS EXIST WITHIN THE LIMITS OF THE PROJECT AREA. STREAM BUFFERS SHALL ADHERE TO THE REQUIREMENTS OF THE ALBEMARLE COUNTY WATER PROTECTION ORDINANCE. STORMWATER STORMWATER QUALITY COMPLIANCE WILL BE MET THROUGH THE DESIGN OF A LOW -IMPACT DEVELOPMENT & THROUGH THE USE OF PRESERVATION AREAS. STORMWATER QUANTITY COMPLIANCE WILL BE MET THROUGH THE DESIGN OF ONSITE DETENTION FACILITIES. > VSMP PLAN AMENDMENT #1 PROPOSED CHANGES: Al THE DEVELOPER WISHES TO CLOSE OUT THE PROJECT IN THE NEAR FUTURE. THE SITE IS CONSTRUCTED, STABILIZED AND OPERATING AS INTENDED WITH THE ORIGINAL APPROVED VSMP PLAN WITH ONLY MINOR MODIFICATIONS. AN ADDITIONAL CULVERT WAS CONSTRUCTED AT STA. 34+80 OF LOFTON LANE (FORMER KNOWN, AND SHOWN ON THESE PLANS, AS GREENLOFT FARM COURT). THIS CULVERT IS LOCATED IN THE VICINITY OF THE HIGH POINT WERE THE CONFLUENCE OF SUBAREAS A, C & D MEET. MINOR UPDATES TO THES THREE SUBAREAS WERE PERFORMED ON SHEET 9 AND IN THE ATTACHED SWM CALCULATION PACKET TO ACCOUNT FOR THE CULVERT. THE PROJECT CONTINUES TO REMAIN IN COMPLIANCE WITH MINIMUM STORMWATER MANAGEMENT REQUIREMENTS. ' A2 AS NOTED IN THE APPROVED SWM CALCULATIONS PACKET AND THE APPROVED SHEET 9's STORMWATER MANAGEMENT NARRATIVE, STORMWATER QUANTITY COMPLIANCE WILL BE MET THROUGH THE USE OF DETENTION FACILITIES LOCATED WITHIN SUBAREAS A & C. THESE DETENTION FACILITIES WILL NOT BE REQUIRED TO ADHERE TO DEQ's POST —CONSTRUCTION VIRGINIA STORMWA TER BMP CLEARINGHOUSE REQUIREMENTS DU TO THE AFOREMENTIONED WATER QUALITY COMPLIANCE THROUGH LAND PRESERVATION." THIS AMENDMENT DOES NOT MODIFY THIS CONCEPT OR THE PROJECT's > SWM STRATEGIES, IT ONLY PROPOSES TO UPDATE DETENTION FACILITIES A & C PER THE Y ASBUILT GRADING AND STRUCTURES WITH MINOR PROPOSED MODIFICATIONS. THE TWO EXISTING FACILITIES WERE CONSTRUCTED TO DEEPER DEPTHS PER THE APPROVED ESC > BASINS, AND NOW HAVE PERMANENT POOLS. THIS PLAN NO LONGER PROPOSES TO DEWATER THE FACILITIES, RAISE THE BASIN FLOORS & UTILIZE THE UPPER VOLUMES FOR ATTENUATION. THIS AMENDMENT NOW PROPOSES TO KEEP THE APPROVED/ASBUILT LOWER ESC BASIN FLOOR ELEVATIONS, KEEP THE CORRESPONDING PERMANENT POOLS & DRILL NEW '' LOW -FLOW ORIFICES FOR ATTENUATION ABOVE THE ORIFICES/MWSE. 03 THE SHEET INDEX AND GENERAL NOTES WERE MODIFIED, WHERE BUBBLED, ON THIS SHEET. / GREENLOFT FARM VSMP PLAN AMENDMENT #1 (AMENDMENT #1 TO WPO 201600034) SAMUEL MILLER MAGISTERIAL DISTRICT ALBEMARLE COUNTY, VIRGINIA 0 11111�1111 IIkIII}I I 1\ III ,� /, �,j /; - -� II 11. II I , 11 V A 1 \ \ \ � A\4 \ i/ i ✓/ / / \\V II I1� 11 I \\\\ \\� \,\� \\ \ 111vvv yyv Ivy \vvvy�,A1\yvv vv\vs� /',% v I I / V. 11ly I\\ — - \ I \ 1\ LOT 4 LOT 5 a --LOT \- RURAL //r/ /; , 111�� hl\ \ � \\` LOT 3 °° ° > ° PRESERVATION _ SPECIAL A � 1 - _ �/r i � LOT 7 L ; TRACT A = LOT ! I\ -may r / - I6T 8 GREENLOFT \ \\ / �;o 1_4 FARM COURl, , IlIlII�✓/�� \, \\I ii q R\ LOT 11 1 \ \1 \ ss° LOT - -� �/ �\ , \ll\11I >,; LOT 10 I 1 I -I P o I, / LOT1 II.�� 5, 1 , ° ° a LOT 12 // , (��� // //�///lll�// III}�111 ° �� 1 �� LOT14 LOT �... / / IIII I } / 1 ) v ' I I ------------ _ I J �I11VAIV� 111 y_ � l l ,l!l/,',`>> 1 � 1 �IIIIIIIIIIIIIIIIIIIII\III I � I � I � `✓ / I AVA\\1\1AA�p1111 1, 1\ I SHEET LAYOUT SCALE: 1" = 250' SITE 706 1631 VICINITY MAP SCALE: 1" = 2000' SHEET INDEX TITLE SHEET COVER SHEET 1 EXISTING ITTIE)NS -2- 3- PHASE T EI' E)SIGn1 O. SEDIMENT !"GNT-f1/'11 P Anl it PHASE EROSI��I 0EE)T����IT GONT��IPI 4 T5 PHASE rr rnn�rE)Pj & SEDIMENT PI PI I A SE TT EI' E)SI/)AI O SEDIMEnIT EONTRO I'll A nl E fl 11ST/lAl O- C"EfIT nA EAIT /"`/)nlTfl (11 f'SET A.TI ["••- STORMWATER MANAGEMENT PLAN 9 STORMWATER MANAGEMENT DETAILS 10 BRATnIAGE SWAI E LBETAT1 S474 1LJ TOTAL SHEETS 41 3 F LEGEND EROSION CON TROL DD TEMPORARY DIVERSION DIKE 3.09 ST TEMPORARY SEDIMENT TRAP 3.13 SB SEDIMENT BASIN 3.14 lP INLET PROTECTION 3.07 SF SILT FENCE 3.05 TSD TEMPORARY SLOPE DRAIN 3.15 CE CONSTRUCTION ENTRANCE 3.02 PS PERMANENT SEEDING 3.32 DC DUST CONTROL 3.39 SA SAFETY FENCE 3.01 RW TEMPORARY RIGHT—OF—WAY 3.11 DI VERSION VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK SPECIFICATION NUMBER SCOTT R. COLLINS Z Lic. No. 35791 "�SSVONAL ESA W A\ z O a �m Z w o U, 00 Vlccf w H W ce 0 w N a o ul z VJ Ir— rl- CIO 0) CV C O N N Q w J W 0 Q 2 CU F_ U) Lu F_ LU 0 (N w J w r, w O w JOB NO. 132091 SCALE AS NOTED SHEET NO 1 - 1, - - -_ -- - I - : I - . APPROVED PRE -DEVELOPMENT SCENARIO I I 1, APPROVED STORMWATER MANAGEMENT NARRATIVE ' ' THE PROPOSED PLAN UTILIZES A CLUSTER DEVELOPMENT THAT MINIMIZES LAND DISTURBANCE AND MAXIMIZES OPEN SPACES AND LAND & STREAM BUFFER PRESERVATION. THE DEVELOPMENT I I I � ---__ , ACHIEVES WATER QUALITY COMPLIANCE THROUGH THIS EXTENSIVE LAND PRESERVATION. THE PLAN ALSO IMPLEMENTS CREATIVE DESIGNS WITH THE ROAD/LOT LAYOUT TO MINIMIZE ITS . I _� I - __ . ----__ ____ I - __ __ IMPERVIOUS FOOTPRINT AND TO MINIMIZE THE AMOUNT OF GRADING & DISTURBANCE REQUIRED FOR DEVELOPMENT. THE END RESULT IS A DEVELOPMENT THAT DOES NOT REQUIRE FURTHER - - - - - - _ - - . . � PHOSPHOROUS REMOVAL. PLEASE SEE THE ATTACHED VRRM CALCULATIONS FOR EVIDENCE OF THIS COMPLIANCE. - __ - - - - - - __ - - __ - - __ - _� - __ ......................... " _­ - -EXISTING DOWNSLOrPE- ,_\ - - __ ------ - _�7_- -- -ULVE ,4 ,� THIS DEVELOPMENT ALSO UTILIZES ENVIRONMENTAL SITE DESIGN (ESD) TECHNIQUES AND PRACTICES IN ACCORDANCE WITH THE JULY 2013 DRAFT VSMH. THE STORMWATER MANAGEMENT DESIGN - - ;;;;;;iiiiiiiiiiiiiii ... , � - Oi8" CMP C -RT � __ - - __ I - -�� - - �-,� ;� - - ---:- + - - - ___ __ CONCEPT WAS INTEGRATED EARLY IN THE SITE PLANNING AND DESIGN OF THIS DEVELOPMENT. THIS IS EVIDENT IN THE ALIGNMENT OF THE ROADS HORIZONTALLY AND VERTICALLY TO REDUCE / - - �_ ____ __ GRADING IMPACTS PLEASE SEE THE ATTACHED STORMWATER MANAGEMENT CALCULATIONS PACKET FOR ADDITIONAL INFORMATION ON WATER QUALITY COMPLIANCE - - - - . . / � ,- I - _____ - - - �7� = - - ____ - - - , , - - __ - - --f - __ - - \ I � , , \ \ , I, - _:::- - __ __ , - - __ __ ,�, , � I - ___�_ - -_ - --- - �� STORMWATER QUANTITY COMPLIANCE WILL BE MET THROUGH THE USE OF DETENTION FACILITIES LOCATED WITHIN SUBAREAS A & C. THESE DETENTION FACILITIES WILL NOT BE REQUIRED TO I I � � \ - ___ - __ - ADHER - TO DEQ's POST -CONSTRUCTION VIRGINIA STORMWATER BMP CLEARINGHOUSE REQUIREMENTS DUE TO THE AFOREMENTIONED WATER QUALITY COMPLIANCE THROUGH LAND PRESERVATION - _j \ - _ft� / - ,�,,� , \ -_ I THESE FACILITIES WILL BE USED FOR WATER QUANTITY COMPLIANCE. , �� I - , I 'I / / - � -1 - - , -, I _�_ _� �, 11 I - - - �, � � � - �� ll � I_ _', -_ I � - I I �' I - r- - - - - W TE - - 1, 1� � � I � , 1�� S� ... 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I , __�, - , \,� ,\ �,�\�\\ � - - - - /� / I -cl - Management Plans -1 0 / I 1,1\\ \ \\\ \ ,� � \ . U-1 \ \ I I -__� - - - _- ,� . 11\' ,- " " \1 - - __\ /i I 1/1 / I I j � Gene� Construction notes for Storm wa te� " \ - � �, /I , " - - - - , \ ,,\ \\ \\� __ - - I /I � I LLJ - _�� \ ) - __ - / I/ __ I - �, , � - - - , , \ \ 1, \ \\ � \\ \ \ i __ � // / L, � �\ ,, � \, I . All dams and constructed fill to be within 95% of moximurn dr� Z W_ / 1, A\ � � ---,\ A � \ - - - // , �� ,- \, ,\ \ I I I - � I I / � , - - - - 1, \ , � 11 �, LP I � ,\ -_- / 11 I - 1, , \ _� I \\ - 101, � _� � -\ ) I I I - -, \­�\ - --\\N�41_ - - I I, / / � , " '% n I I- 1` 1; - - - - � , / , , \\ � �\ � , ptimurn moisture content. All f!Il material to i- - = / // � - \ 1\ ,.\.,\- - - - � / � , , \ Z_ U �_, " I I I/ ) __-_ -_�- / /,- - , 1, - - - - - " I �,,, - � /� � � \\ , " ,-, ,� �, ,� --� \ " - . . . I , - / - - - �_\ \ � 1 I , - , , I " - \ \ \ \ \�\ ,; - 7 / / / / � -Z -, � � _� � � , ,� \ ,\' , a chniccl engineer. A geotechniccl engineer I � t:- - 11 < - I / I` // /I / " 1, / ,_ - - - - / , - - - __ - - \ \\ , 7 \ \ � \ "\ � - /// - - , I -- "I ,� � ,� , -_ " '� -�,\\ \ be present during construction of dams. �� - - / / - - __ I �ll \ " \,\ - , !Zm: � I - - a -1 - - - - 1, ,* /,�'_ // / / / - ,� 2: W ,- / " �', / , , / / / - - �/ - __ I 1� I � -�� / / / - I I __> 0 \ , , __� / I � � / pr� / / 1 \ / __� _-� _-, \ I � I I / 0 ,\\ �, \ - // Pipe and riser oints cre to be watertight within stormwater - � , , / - \ - - _� 0�, , ''I / / / �, I "" I '1� � / I 0 , � - \ \ \ 2. i - 1'� I / ", /I , � / - Vftn M 0 0 it #* -, �', 1, , ,\� - - _-� __ / _�,�__ - - -n an t , I /I / / � � � * / \ __� / - -_ - - - - - McnageI f ac il ities. - �_, I I - ( / / � , 4 - - - - - � #8 0, \L_�� , ,�\ J� --:_ _/ __ / - -, � 11 I __ - / LOC� - - __ /�z ----3. For temporary sediment traps or basins which are to be converted -1 --,-/ i / ( - - � � � � __--- 1� '� _ � / I I I DEPRESSION ' - - ::_ - - - - __ - I / / 1�1 ,- - - - - - I I � I \ - - � � - � : 11 - --:�-__-�:- -- -_ - - __ - � / �, 11 � - - - - - to permanent stormwater management facilities; conversion is not - I / I\ __ � ___ __ __ I 11 / ,/- _- - \_ - __ - ____ __ __ \ , --- - - 11 // - _:__ - - - , I / - I � � - � \,-,-, - -_ - - _ - - - - ,�, (, / - to take place until the site is stabilized, and permission has been - - - - - - - -'--- SCALE: 1"=200' � / F obtained from the County erosion control inspector. - - '' 0 1 / i _j AMENDED POST- DEVELO PM ENT SCENARIO I ----__ . __ - - -11 __ 1� - ___ - - - - . __ ----__ . - - .- __ __ - - - - . ___ - __ _ - :�---__:�:: --- - - --- - - - - - - - ___ __- - -I-XISTING DOWNSL(�, - - � __ __ ;; ; _____�. --- 018" CMP` CULVERT __ - - - �_ I - - �. __ -�_s _- -_ - - - - __ - � - - %. I- ,:i-:- :-,L�-_- -- - I - - I - I'll, __ __ __ Total Proposed Imp. Area Breakdown �Road 82,395 sf Residences (6,000sf / Lot) 96,000 sf � Total= 178,395 sf __ I I - .1 / I ; - I I , - __ - -1 - - � - 1'� I I - - - Z' I � -\\ �AP __ ------- -:7, � __ � � - - � � 1, I - - . _! I __ _,___� - __ . . "_ / 11 I Subarea A Proposed Imp. Area Breakdown / - - 0,13 - __ :��_ - I I- - , - ____ __ - " / Road 24,300 sf - - __ - I __ I I 1 I __ - \-N � ��:_ - __ - -1 1, I , � � I - � / , � - - / - - :� �� _� 1� Z - " * - - �_� � - __ - " U - - - - - ---- _,� - - - - - - - Lots 5, 6 & 16 (Full) and 4, 7 & 15 (Half) 27,000 sf V 64'57 � � �, - - � _� " __­� - , - /_ , � -) �_ - - - . �_ -A - \ _�� � , - � - � < INTERM,TT - � I � � � 11 I - I __ � I - :7� 1Z I /I I 7=� - � - __ - ��­`?�C��,�,�� - _/ , �1 C=0.2 . :7 'i � AW - - - _,�- - '\ � � ,��/- - -� Total= 51,300 sf \ \ -_ - . Z � �� __ _:�:� - �', - - � V -no- /- - -.-� \\\-/, _- - --- - - - �� :� - - - - __� --� � ** 7 7 I )�, __ __ - - t:::�:,- - __= � � - �' �# - - I ��-� \�f - - - __� ___7 __ i , ( > .. � - I , 7 1 "_ , - C� - 1/_1 -:7 - - - -...- ____ - - - - - - I Subarea B Proposed Imp. Area Breakdown I �, qr i� - _�� I p � *. - ___�_ K I \ , 7*;/ z1 ­ - - - , 4 - - - � -, � - - Road 11,515 sf 11 ��� ) , - - - - -5013A -_ - , - __ - "I - __ __ I \ (a -� \ , � I - - - :� �� __ - Kit - - - - - ING-1W:1() Qy ,Vutv , r \ - - 1, I 1�1 � � 7 -_ - - - 29D. UG - -:4117 - Lots s f � , I -1 0 - I - - � _- - __ -,. -, - 1, I - � � I%\ I � __ I - I I \ 1 S -rA I � / \ - , - -0 - _CN__ - - - _S- - ---- - ,)- , \ ) � Rou �,//Vpro­ - - - - Total= 11,515 sf ** I / , - ____7�_ - - _ 1� , )) "I - \ I �� 1 , �_ - - �1_ -= -_ �__ - � I - _�__ - - I I /I/ 4V / _� 11 ­- -2,4 h r - - ___ - - __ _��, 11 \ ) "/� I / I , (( / � E , ---- -' _--TT=u; - - - _� I - \ �� ,/ib �,, ::' - � ---, , - - �:_ __ - - -----�- ---- - D - I � I \ I � - qW / 1, / I 161� / \ /17 '44W / , -A OVED,FIN �� - - - - __ - _11<1' , � - - , , i , �� , \ M) / ,�., / '' , -- - Z:�- -= , " , , /11 - I 1, Subarea C Proposed Imp. Area Breakdo Ain ,.. - \, \ \ � \ � � �_` � , / / / I N , �* , ' �off ,_ F OLF , - - - - - - - - I - I X�� , I,/ - - Road -29,650 sf \� \ � I I / �/ �\ _* '/ / (Tc=o.: __ � -APPRADVE-D 17,­ 1 __ I � : / - - I - Lots 10-14 (Full) and 15 (Half) 11 , _� 5' OF CHANNE I __ I \ \\ � A -i Z) k1w , � I , P 0 I - I V'r 2 /./ - [If I E__ - 5' ,� �o � � �- I ,�, _� 1, ,P V " - I �,/ \ " � (Ti��-o.o �.) , �� F-O V4�A I \ - I � I ,�'! / -1 , --- I , -_ I - \ , ��PO'VS'E LOT i-� jl�l _� =0 5hr .)., , � ��\ 4- ---,, Total= C62,650 sf 1�� \ � - � ( � 0 __ I , � �� I - E � '�,-_�,/ � - - _­ 11 ,/ I'll, ­ . 1. �" I __ / � __ I - - 11 11� 1�w - ­ I - I . I --- - - , /1) - --- __ 1 1 1 ; I I __L_OT 2 Z 0 � , __/ I - - - Z_� - - I � � - �1_ -�_ __ - - ,�,___/ 1, . Subarea D Proposed Imp. Area Breakdown,-,,.,-,, 1* I l � _T_� - - - �- - __ __ - , __ - __ � 11 � __0 "\ I I I � I I I I I � � � -, ( - ku-u0ifs- I - - __ // __ - ,� Road �, � �, 1�1 I _� � � I , , 4��,a�-, - _� I- , I- - \ I, � / I_ " I / - - __ - --i -_ - \53!�_� :�� \ - I -APPROVED,L � 6E�� �A�S,, I - I' I \ - I/ Lots 8, 9 (Full) and 7 (Half) 15,000 sf I I'll 1, __ , . / � - �_ '41' - I ? �v I �N I " I 0- --t / '_1 � �i I - Lo , I / - -LO`T 3� � , , /� Total= r /_1,W)U ST \\** I _ � � b�ROVE� CUL RT_ \ - - / , - \ )-�� '�MAIN A "NC 9A I I / � , /I \� j 7� I � 1 1� �_ & S�� , , �1 j - - - I - ��,__11_11__� - / / � � , � ,, I 1-;I I I ) � DIRECTING RUNOFF - ,� �_ \� i - __7 - - I � , \\\\\\� I I � , / / 1 I I �00 41 1 , I�R6N/�ROAD INTO/' - __ ')_� - - - -��:T - - � � � ,(-,- &N, � � ''' � '_ , P -<- L-i Subarea E Proposed Imp. Area Breakdown , --, , V, 1�1�/// /� ) // , ) / � - _V I 4 - - - ,�, � \ � � �� 11 � / sw,�4_-E " - - � - - 1� � - 11 �, � � /' ,/, / "I I -, "' --- / I ,_ - - - , I - Road I s I 1, �� � I X� k - - __ , 1�� � �� 11 - I 9__ ___ - � - - - , - - 4F 1 _�: - I, -, -,�' ',",_ � '�` � / � ___ LOT� -0 - - � � , Lots 1-3 (Full) and 4 (Half) 21000 s 1�', , t� ,X� \� \ , , -0-. ,\F-- -$- - , ,, --- - - - I / � I T � � I�A \ � � __ � , �/ 1Z , 1, LOT - ( / �� I I ��,,�� \ \ � / I \ � \ �_ � #7 , Total= 31,280 sf - - - � --��-�_ � - I � � � _x6, - __ - - __ - � 1 7 1 � ," 1� ­�) \ , � � I � - "I " I , \ I I , - - _,� - I I I � � �,C - ____:71�1 , I \\ \\\ \ �, - � " " � I I - - - I-, __ - 4F 1 , - , , l � , � ,�� , � , 0 - - 7w, , "� �� - " _, , \ , \ ", ----O- - _� - ­1 I _�_ - ,>"\ ': , �,�, 11 \ , I - ( /J� _:�� I ­ �, \ 1 , -rz�- - ,_ , __"�� , - I _=____ - , - - - �, - � ,�� " - �/ - - 47 , I �. � ___ �3'. ,� -, " 72o_ - ::--�: :�_ -_ %;; \� _ - 4k- "'� �� , I 0 FW LTI:STAGiE R I S F1 - - - " 7Z,g4 �, S�� \ I�CGNS'TRUCTI� � , �I - � I , \\ \'\'\ 11r__ , , , �7�_ z�� , j �_ ��l AsRd� _ - _-, \�\ , � - I � � -\ 1, B RREI�-S-PILLWAY&_ :_- - __ _____�, - __ - - __ --- , __ // 0 - �_ ��� I ___�� � --\ I "I � '-- _:-�t� - _��_ � �,\,\\� '' _� I - - - - - - -_ ,) > V , I \ -\ EMB AN KN"T-&T­T H �_ - Z%�� - � ,--1k -f\ _ _ V_ �' - , V '.., -P -0 F-TV E - IV- __ ­ - �Sl _`r-t- __ - - - :_:�__ OR �\ 1 - I -XI> R1 - - � � _� - ��_, 71 __ , \\\ \\ L,\� � �� 1 -LOW _GINT, - _ �� - - - _� T * � -41. 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COLLINS'�� 0 Lic. No. 35791 '­1 �� 11�1 4� 1�0�Alsl��IIONAL '6�mG�r) Z 0 -, I.- < W ,_ r 0� U 2: U) co Uj :D Z 0 U) Z _j 0 C) < (_j I-_ ) - M Z LU (A O'� - M > Uj ce C) LU r1i �__ -_ < 1.0 -4 0 � ko Lu NFIA Lu Z W Ul Z mmi 0 U (3) V_ rl- CY) . CY) 0') CNI . q:11 CY) NT I N 0 0') CNI N < > - LU _j _j > U) ILL] �_ �_ 0 _j 0� < 1: C) I �e LL] �_ D - - - �_ LU LU 01� �_ U) �_ �__ LU 01� < (D C) C:) N T__1 4t: �_ Z LU 2: 0 Z LU 2: < Z < I CL r) 2: Lr) > 2: 0� < LL. I- LL 0 .j LU LU 0� ( 9 Z < _j 0- F___ 2: LU 57 LU (D < Z < 2: 01� LU I— < 3: 2: 01� 0 �__ U) Uj _j I-_ F- I-_ U LU �_ In LU 0 Uj 0� = a- I JOB NO. 132091 SCALE 111=200' SHEET NO. 9 X- APPROVE SCALE 1 IDE ' = , ' = AMENDED DETENTION BASIN 'A' "=30' � - -GRADED, AR EARTHEN � -- - y ( ) - ACCESS ROAD = CdUNTY DEFINED CRITICAL'- L�i6 / ,(/.. - SLOPESTO REMAIN,7\ UNDISTURBED (T P.) / - "' = �= / 61 L �\ ASBUILT LIMITS k OF RIPRAP TO �EP�LOTATIOIa}THE RISER BASE { � - ! I 66 - - - \ SEE THIS SHEET.FOJE_" / AND BARREL CONNECTION -SHALL BE - - - - - \ \ SCALEOPROFILE FIRMLY -EMBEDDED 6"I THICK C E FOUND -xa_. S',AND EDB O,� LIMITS OFT E BASIN DIN / 60 5 98 APPROVED10 WI ESOP- / \ \ \ 2+25 OF DAM Et = 6oz.5o / - 0+00 ' '_ - ' AASBUILT 018CL. III kLR BARREL T , / � � � �5�-� � / il�� I I II I I ? 00 - 89.7LF;ifsf�N=S$9:z5, INV i�� O i 88. z" l l / �� �° i ASBUILT 0 "48" CLRCP . III STANDPIPE w/ / ASBUILT END WALL & RIPRAP Y TRASHRACK,SHALL SERVE AS THE RISER STRUCTURE. TURE RIM ELEV- 8 ONE (i) LIMITS. APP" OVED VDOT STD 2 RISER STRU. I I 1 i MWSE= -� 597. 3'• \ i4' LOW -FLOW ORIFICE w/ INVERT ELEV.=Sgo.00 & EW ° F`w/ VD T #3 CO E / , \ i 590.00' !„ ONE (1) 04 MID -FLOW ORIFICE w/ INVERT AG GATE - LJTLET P-ROTECTI N \ w/ GEOTEXTIL TERYAB _LEV.=5�5.0o TO BE SEALED WATERTIGHT. ' U DERLAYMENT (L=20', W I�-6', 1 \ I I - - / CONTRACTOR TO DRILL ONE (i) NEW 06" LOW -FLOW N I I v ` i✓ / ORIFICE w INVERT ELEV.= o.00 \ / W�10' D-2' MIN. � +00 i 59 I 12''WIDE ODEN�IDGE wl HANDILSJOBE DESIGNED/ - DETENTION BASIN A ,q���OT ERS,TO PROVIDElevation Basin Contour Volume FHIC LAR ACCESS ACROSS / Areas N POINT. (ft ) (sf ) (cf ) 586 2194 - -6 - 588 2619 590 3406 0 I � / � �BTJIL� ' IDECrRAS�L'INEIa' 6iF, / G'F'F E E-MERGENC-1( PILL.WAY_CREST ' 592 4403 7,788 LEVATTON=600.7S' / / / LOT 15 594 5500 17,670 Ir N -APPROVED BA N SPILLWAY SIDE SLOPES 596 6698 29,849 SHALL BE 4:1 OR FLATTER TO PROVIDE A SMOOTH VEHICULAR TRANSITION ALONG / 598 7997 44,525 I THE ACCESS ROAQ & TO PROTECT THE / 600 9396 61,899 % ( (GRASS LINED SPILLWAY. / APPROVED VARIABLE WIDT -- APPROVED SWM MAINTENANCE R�ACCESS SWIM MAINTENANCE & 602 10661 81,942 ESMT. COINCIDES WITHIPROPERTiY LINE. ACCESS ESMT. (TYP l 602.5 11040 87,367 . A A A A A A A A A l TOPREVENTELOTATI NTHERISERBA'5EAl AMENDED DETENTION BASIN 'C' (SCALE 1"=30') L BE BARREL CONNECTION HALFIRMLY EMBEDDEtS 6" INTO A REINFORCED i8" THICK CONCRETE ' FOUNDATION THAT IS ' x . ' Al BURIE LASBOLTCL. IIIRCP STANDP)P-E wJ BELOWT/HELI ITS O'FTHE;BASIN GRADING.ALL SERVE AS -THE RISEF _ =�-A/PPRSSVED VARI BLE WIDTH �R I COUNTS DEFINED ST P / SWM MAINTENANCE &IC . C RI r , A' R T ,. I T,_L.F R , � ,i- SLOPES TO RE A1J�1 =I- bf lACCESS ESMT. COINCIDES 6 .9_I . CONTRACTOR TO - UNDIST (�YP� -<�// WITH SPEl LOT'.LL _ �R 9 - al li 4110 - ( / l w%INVERT EL 00. _ - -- BOU DA Y(TYP.) =557 i, i _ �0 I ABUIL io' DIVIDE TOF� OF - - \ I- / DAM ELEV( = 666.010' i I i II II �I I / APP�CVEDBASIN SPILI SIDE SLOPES SHALL/BE 4:1 OR - _ / // / / i i \ \ - / LATTER TO PROVIDE A T 6 / / / j / , / / \ \ 11_I SMOOTH VEHICULAR / TRANSITION ALONG THE / / / / i - I I _I_I Eh - / / / ' / / / / , LI ACCESS ROAD & TO PROTECT a �J(' THE GRASS LIN D SPILLWAY. II -III- � / 1 n / / i // X\ \ ' / ASBUILT 018" CL. III FRCP Q / L III III- I I %BARREL 6 F - _ INV. ( - 6. 6' W. 55 4 I ETHIS SHEETS I _ OUT ' 555.91') ',JO_R THE SCALED I III_= 1 SBUILT ND WAL4 � RIPRAP( I IT=III I /LIMITS. A�PROVED OT STD. I PROFILE (TYP.) / I _IT_I- / / III -III EW 1PC w/ VDOT # OARSE AGGREGA E OUTLETOTECTION w/GEOTEXTILEFILTI FABRIC DETENTION BASIN 'C' - _ \ 557-00' I IILI ; I � UNDER AYMENT (L=1 W1=6', Elevation Basin Contour Volume 2=16', D=z' M) �-APROVED VARIABLE WIDT� (ft) Areas l(cf) �- - _ ��wv / / �I� II �� li �� SWM MAINT�i & 1 +73 I �CCESS ESMT. COINCIDES 550 2486 - - - _ v _ / / �� _ A \ V WITH 'SPECIAIL�T' LINE. ST I AlI 552 2926 10 'l, \ \ 554 3401 0' R A� \ \ BUFFER (Y 556 4200 - -_- - � Sj LJI+99, LINED 557 4763 0 ASBBI 7LT RIPRAP-L+MITS. \ o \ v li- V A EMERG NCY SPIL WAY CREST PPROVED -1 #3 COARSEN ELEVATION= 6 00'- 558 5350 5,054 AGGREGATE OUT 4 \ �v A 'ASBUILT E D WALL &RIP AP ROTECTIC-N w / 560 6603 16,985 1 GEOTEXTILE \ \ � � - - L TER FABRIC UNDERLAYMENT LIMITS. APPP�OVED�/DOT ST(D. 562 7955 31,522 (L=6', D=7', W=0 EW 1PCw/VDOT#3COARS APPROVED 10' WID�AGGREGATE �� AGGREGATE OUTLE PROTECTION w 564 9408 48864 - - GRADED EARTHEN GEOTEXTI,LE FILTER FABRIC 566 11336 69,579 ACCESS ROAD \ - ,UNDERL4YMENT(ID-z,W=6) , ECT10 A-9; TYrlil GRAPHICAL DIIALiLS HamQpwous till 4min ' Cut -off trerTeiT-C bellow sI.ilitable matwid Sail iar rock 1.. j TYPICAL HOMOGENEOUS EMBANKMENT I TPi'a� aufJok Coupe fi$ r 4f�lr►d �Io�� Perforated O III uior rourldl c1l FOUNDATION DRAIN -�-131,anket dmin BLAN KET DRAIN fill or gravel Sanl 9rmilld or il dN'ain auiki � flncs cw gruel Rock kDGq_� drain z0runsilkn�n filler Tronai#i rk Filter CHIMNEY 'DRAIN TOE DRAIN .S'om-ce_ -S Fill Alai lta,:7rl Fauure A-lil Homogemecir5firrba mkilil +r,,'''S'ee-page Callit'l ASBUILT 04-2�' 48" CL. III RCP STANDPIPE w/ TRASHRACK SHALL SERVE AS THE RISER STRUCTURE. RISER STRUCTURE RIM ELEV.=5'99�1 597.83'. ONE (1) 04" LOW -FLOW ORIFICE w/ INVERT ELEV= o.00 & ON17 04" MID -FLOW ORIFICE w/ INVERT E EV.=S95.00 TO BE SEALED WATERTIGHT. CONTRACTOR TO DRILL ONE (1) 605 NEW 06" LOW -FLOW ORIFICE w/ INVERT ELEV.=59o.00 ASBUIL 45' WIDEIGRASS LINED EMERGENCY SPILLWAY CREST E EVATIONI­600.75' (io' TOP OF DAM F I FV. = 6 600 A P E-CON TRU TI INSTALL T E OR DE EMB NKMEN IN ACCOR DETAILS & N TES "AWN N THIS SHEET. 595 ASBUILT END WALL &RIPRAP LIMITS. APPROVED VDOT STD. EW-IPC w/ VDOT #3 COARSE AGGREGATE OUTLET PROTECTION 59 w/ GEOTEXTILE FILTER FABRIC UNDERLAYMENT (L=20', W1=6% W2=10% D=2' MIN.) APPROVED DETENTION BASIN CONSTRUCTION NOTES: 77'P APPORVED BASINS A & C NOTES:��� 1. SEE DETAIL ON THIS SHEET FOR RISER TRASHRACK/FRAME & COVER. 2. STATE APPROVED TRASH RACKS SHALL BE INSTALLED ON ALL ORIFICE OPENINGS. FACILITY PLANTING SPECIFICATIONS: 1. THE DETENTION BASINS SHALL HAVE TURF GROUND COVER, SUCH AS GRASS, MULCH OR SOME OTHER FORM OF A VEGETATIVE GROUNDCOVER.� 6 0 3. A CONCRETE FOUNDATION SHALL BE INSTALLED ON THE RISER AS SHOWN & LANDSCAPING BEYOND THIS IS OPTIONAL AND IS NOT REQUIRED. MEETING THE MINIMUM SPECIFICATIONS SET FORTH IN THE VESCH SPEC. #3.14. 2. THE PROPOSED SIDE SLOPES OF THE BASIN SHALL BE A MAXIMUM OF 2:1 TO REDUCE THE RISK OF EROSION. THE PROPOSED FLOOR SLOPES SHALL BE GRADED SCOTT R. COLLINS � TO PROVIDE POSITIVE DRAINAGE AT ALL TIMES TO THE RISER STRUCTURES. 0 Lic. No. 35791 ASBUILT45' WIDE GRASS LINED 3. WOODY VEGETATION SHALL NOT BE PLANTED OR ALLOWED TO GROW WITHIN 15 FEET OF THE TOE OF THE EMBANKMENT NOR WITHIN 25 FEET OF THE EMERGENCY SPILLWAY CREST PRINCIPAL SPILLWAY STRUCTURE. d ELEVATION=600.75' 4. A VEGETATED BUFFER SHALL BE PROVIDED THAT EXTENDS AT LEAST 25 FEET OUTWARD FROM THE BASINS TOP OF DAM ELEVATION. PERMANENT (io' TOP OF DAM ELEV. = 6oz.So') STRUCTURES (E.G., BUILDINGS, SHEDS, etc.) SHOULD NOT BE CONSTRUCTED WITHIN THE BUFFER AREA. EXISTING TREES SHALL BE PRESERVED IN THE BUFFER �`q S E lA Gs\ 600 � n5 605 AREA DURING CONSTRUCTION IF AT ALL POSSIBLE. I 0 NAIL - D. THE SOILS IN THE 31 URMWATER BUFFER AREA ARE OFTEN SEVERELY COMPACTED DURING THE CONSTRUCTION PROCESS, TO ENSURE STABILITY THE DENSITY t ASBUILT OF THESE COMPACTED SOILS CAN BE SO GREAT THAT IT EFFECTIVELY PREVENTS ROOT PENETRATION AND, THEREFORE, MAY LEAD TO PREMATURE MORTALITY � GRADE OR LOSS OF VIGOR. AS A RULE OF THUMB, PLANTING HOLES SHOULD BE THREE TIMES DEEPER AND WIDER THAN THE DIAMETER OF THE ROOTBALL FOR BALL -AND -BURLAP STOCK, AND FIVE TIMES DEEPER AND WIDER FOR CONTAINER -GROWN STOCK. _SBUILT RARE 6. AVOID SPECIES THAT REQUIRE FULL SHADE, OR ARE PRONE TO WIND DAMAGE. EXTRA MULCHING AROUND THE BASE OF TREES AND SHRUBS IS STRONGLY - RECOMMENDED AS A MEANS OF CONSERVING MOISTURE AND SUPPRESSING WEEDS. 595 60U 600 CONTRACTOR REQUIREMENTS: 45 1. THE CONTRACTOR SHALL BE RESPONSIBLE FOR LAYOUT OF ALL WORK COVERED UNDER THESE PLANS. APPROVED BASIN - -� 2. LANDSCAPE CONTRACTOR SHALL REFER TO THE STANDARDIZED LANDSCAPE SPECIFICATIONS FOR THE STATE OF VIRGINIA FOR ADDITIONAL INFORMATION. DE SPILLWAY SIDE SLOPE, THE CONTRACTOR SHALL ABIDE BY ITS CONTENTS; HOWEVER ANY NOTES OR SPECIFICATIONS ON THE PLANS SHALL SUPERSEDE THOSE OUTLINED IN THE SHALL BE 4:1 FLATTER TO PROVIDE A SMOOTH SPECIFICATIONS MANUAL (COPIES ARE AVAILABLE FOR A FEE FROM THE VIRGINIA CHAPTER OF THE AMERICAN SOCIETY OF LANDSCAPE ARCHITECTS, VIRGINIA VEHICULAR TRANSITION NURSERYMEN'S ASSOCIATION, INC. AND THE VIRGINIA SOCIETY OF LANDSCAPE DESIGNERS). ALONG THE ACCESS ROAD 3. ALL PLANT MATERIAL SHALL MEET THE MINIMUM SPECIFICATIONS AND STANDARDS DESCRIBED IN THE CURRENT ISSUE OF THE AMERICAN STANDARD FOR 590 & TO PROTECT THE 595 595 NURSERY STOCK, PUBLISHED BY THE AMERICAN ASSOCIATION OF NURSERYMEN, 1250 STREET, NW, SUITE 500, WASHINGTON, DC 20005. GRASS LINED SPILLWAY. 4. THE CONTRACTOR SHALL VERIFY ALL DIMENSIONS IN THE FIELD AND NOTIFY THE DESIGNER OF ANY VARIANCE FROM THE PLAN. MWSE=590'1 r 5. THE LANDSCAPE CONTRACTOR IS RESPONSIBLE FOR VERIFYING THE LOCATION OF ANY ONSITE UTILITIES (CALL MISS UTILITY 1-800-552-7001 BEFORE ANY z I(� 2 EXCAVATION). U - ASBUILT 018" CIL 111 TO RCP B (8$ BARREL P EVENT FLOTATION THE ISER BASEAND CONNECTION SHALL BE EMBEDDED PRE- ONSTR CTION 6. REFER TO THE APPROVED FINAL SITE PLANS FOR ANY DETAILED SITE INFORMATION. 7. ALL WORK SHALL BE COORDINATED WITH OTHER PARTIES. Q GRADE 1 IN 89 7 F INV Jiry r 6" INTO A REINF RCED 8'I' THICK C NCRETE 8. PLANTS WILL BE PREPARED FOR SHIPMENT IN A MANNER THAT WILL NOT CAUSE DAMAGE TO THE BARK, BUDS, BRANCHES, STEMS, OR OVERALL SHAPE OF U � 585 IN=589.z5', IN ' OUNDAIIION THA IS 8. 1 8. AN IS BUR( D 585 590 5`� 0 THE STOCK. CONTAINER GROWN PLANTS WILL BE TRANSPORTED IN THE CONTAINERS IN WHICH THEY HAVE BEEN GROWN. Ill w m OUT= 88. 2' BELOW THE LIMITS OF THE BASIN RAIDING. 9. ALL PLANT MATERIAL, UNLESS OTHERWISE SPECIFIED, SHALL BE UNIFORMLY BRANCHED AND HAVE A VIGOROUS ROOT SYSTEM. PLANT MATERIAL SHALL BE 0 1n HEALTHY, VIGOROUS, AND FREE FROM DEFECTS, DECAY, DISEASES, INSECT PEST EGGS, AND ALL FORMS OF INFESTATION. ALL PLANT MATERIAL SHALL BE z Q J J CV 01 Lii l O 00 r O 01 J J N N FRESH, FREE FROM TRANSPLANT SHOCK OR VISIBLE WILT. PLANTS DEEMED UNHEALTHY WILL BE REJECTED. O W W 4 raj O 0 l O W W 00 C'l F p 10. ALL CONTAINER STOCK SHALL HAVE BEEN PROPAGATED IN A CONTAINER LONG ENOUGH FOR THE ROOT SYSTEM TO HAVE DEVELOPED SUFFICIENTLY TO HOLD z _ O O O CD O O Lf�O ITS SOIL. CONTAINER STOCK WITH POORLY DEVELOPED ROOT SYSTEMS WILL NOT BE ACCEPTED. (� w W lei in _0LO LO LO W 0 O O 11. PLANTS NOT INSTALLED ON THE DAY OF ARRIVAL ON SITE SHALL BE STORED AND PROTECTED BY THE CONTAINER. OUTSIDE STORAGE AREAS WILL BE SHADED �I� � ~ AND PROTECTED FROM THE WIND AND SUN. PLANTS STORED ON SITE SHALL BE PROTECTED FROM ANY DRYING AT ALL TIMES BY COVERING THE BALLS OR 0+50 1 +00 1 +50 2+00 2+25 0+50 0+75 ROOTS WITH MOIST SAWDUST, WET BURLAP, WOOD CHIPS, SHREDDED BARK, PEAT MOSS, OR OTHER SIMILAR MULCHING MATERIAL. 12. THE OWNER RESERVES THE RIGHT TO SUBSTITUTE PLANT MATERIAL TYPE, SIZE AND/OR QUANTITY. ANY SUBSTITUTIONS MUST BE APPROVED BY THE DESIGNER. PROFILE SCALES 13. MINOR FIELD ADJUSTMENTS MAYBE NECESSARY DUE TO SITE CONDITIONS (EX: ROOTBALL AND UTILITY CONFLICT). MAJOR ADJUSTMENTS MUST BE Uj BASIN A- SECTION II 51 �) BASIN A- SPILLWAY APPROVED BY THE DESIGNER. 1 = �/ 14. NO PLANTING SHALL OCCUR WHEN THE SOIL IS FROZEN. 1"=50' (H) 15. PLANT MATERIAL SHALL BE PLACED IN EXISTING SOIL WITH EACH PLANTING PIT EXCAVATED TO A SIZE SUFFICIENT TO CONTAIN THE ENTIRE ROOT BALL OR ROOT MASS, WITHOUT CRAMPING ROOTSTOCK. c 7 570 16. THE CONTRACTOR SHALL MAINTAIN A ONE (1) CALENDAR YEAR 90% CARE AND REPLACEMENT WARRANTY FOR ALL PLANTINGS. THE PERIOD OF CARE AND REPLACEMENT SHALL BEGIN AFTER INSPECTION AND APPROVAL OF THE COMPLETE INSTALLATION OF ALL PLANTS AND CONTINUE FOR ONE CALENDAR YEAR ASBUILT 036" CL. III RCP STANDI RASHRACKS SHALL SERVE AS TF STRUCTURE. RISER STRUCTURI ELEV.=56-.75 S62.94'. CONTRAC' ACTIVATE/INSTALL APPROVED ON OW -FLOW ORIFICE w/ INVERT El TO PREVENT FLOTATION THE RISI AND BARREL CONNECTION SH/ FIRMLY EMBEDDED 6" INTO A REIN 18" THICK CONCRETE FOUNDATOOP 7.5' x 7.5', AND IS BURIED BELOW TF OF THE BASIN GRADING. u i rinr r,l t1 ¢:� '^rank e.I1-ael.ad will- .71'H rasLeneT 15�)T"r15't,ri� I l,'4- HDPE P_ulo (,opLfanaLj l��lpe _ ^Y'•. ..ti VOF: Lys HPPF 41r"niuml p1m !Ir wl h+al�ea arid 1I ' Plate �� 1 11ynLlf101 sd by 0 udutions rnc, or equal 00 -I d r� 00 .,t3 ^'+'x: •. ,tw, r - * ehoxrn with optional plate I .I-v r. I..,-1 hIMMII(! erith 1 P" hoLes and A/4` plate �1c?C'.(.lt�n mom" rectured by Plesil nl+Iraans L1r ar aqual i h 5 L, + CD 00 _ r 7���] P.1C. r1[1% c.;3Ba3 11r' r7RIS CAGE ''�I,1'1I�1�� �r,caes:er 'd 2E7d INC. .977-8a r-5727 try A.plryszic-Ealtlfir.sam �IPRE- N ION LRADE F'65 565 1P wl E RISER \ RIM _ gSgLIILT BUIL 'OR TO I I N F E 1 _ N 560 �� 560 :R BASE ILL BE FORCED ITHAT IS E LIMITS M Wry Y vw A s 555 A 555 Fr0 5- 0 �I d w w c1 1 � Q0 In W LO Ln � Ln I.�� 0+50 1 +00 1 +50 1 +75 BASIN C- SECTION JC TURA L A A P AEW .r 1 •r r ^� H I � H r ll RACK ASSEMBLY ROUND SFN7IES SDLU11 DNS INC- RACK RISER 1 54" WP' AND -ASTIC PIPE ELEV. A -A NOTE ''A13JNTIN+G KIT INCLUDED- PART NO 60" ROUND $ERIE$ 4 PL►15TI'G P.�. KM R TRASH p,� 244 Mt014f4 F�BO I RM,7H RACK °} SOLIllil[1N5 ax�"I,�t� . VA 22W RAP 61J 1. INe. 54-0-72T-469A (FOR 42" Conc. Riser) .Yr4.Plwtle-s"Iuklnn,cwn -ASBUILT 75' WIDE GRA`. EMERGENCY SPILLWA ELEVATION=564. (io' TOP OF DAM ELEV. ONTRACTOR SHALL IN EMBANKMENTIN ACC wl THE DETAILS SHOWN ON THIS PPROVED BASIN SPILLWAYS HALL BE 4:1 OR FLATTER TO MOOTH VEHICULAR TRANSIT THE ACCESS ROAD & TO PRC GRASS LINED SPILL 'SBUILT END WALL & RIPR APPROVED VDOT STD. EV 'DOT #3 COARSE AGGREGA PROTECTION w GEOTEXTI ABRIC UNDERLAYMENT (L= W2=16', D=2' MIN ASBUILT 018" CL. III RCF= BARREL (� 64.9 1 INS N=556.46', INV. OUT=L; , 555.91) 2& PROFILE SCALES (V) 1_"=5o' it 17. THE CONTRACTOR IS RESPONSIBLE FOR REMOVAL AND DISPOSAL OF TRASH AND DEBRIS WITHIN THE LIMITS OF THE PLANTING ON A DAILY BASIS. 18. THE CONTRACTOR WILL NOT BE RESPONSIBLE FOR PLANT MATERIAL THAT HAS BEEN DAMAGED BY VANDALISM, FIRE, OR OTHER ACTIVITIES BEYOND THE CONTRACTOR'S CONTROL. FACILITY CONSTRUCTION 1. THE DETENTION BASINS MAY SERVE AS SEDIMENT BASINS DURING PROJECT CONSTRUCTION. IF THIS IS DONE, THE VOLUME SHALL BE BASED ON THE MORE 5 % O 5 70 STRINGENT SIZING RULE (EROSION AND SEDIMENT CONTROL REQUIREMENT VS. WATER QUANTITY TREATMENT REQUIREMENT). INSTALLATION OF THE o W N :S LINE ( Cl \ )o' :666.��. i- I TILT h'ADE 565 565 STALL THE >RDANCE NOTES 75' HEFT. DE SLOPES 'ROVIDE A 560 560 ON ALONG TECT THE PRE- ONSTRU TI N. GRADE 4P LIMITS. li w/ -E OUTLET _E FILTER l W1=6% 555 555 > >> LLJ W W n U Ln � A LI_ PERMANENT RISER SHALL BE INITIATED DURING THE CONSTRUCTION PHASE, AND DESIGN ELEVATIONS SHALL BE SET WITH FINAL CLEANOUT OF THE F- SEDIMENT BASIN AND CONVERSION TO THE POST -CONSTRUCTION POND IN MIND. APPROPRIATE PROCEDURES SHALL BE IMPLEMENTED TO PREVENT \ DISCHARGE OF TURBID WATERS WHEN THE BASIN IS BEING CONVERTED INTO AN DETENTION BASIN. �o 2. DETENTION BASINS SHALL ONLY BE CONSTRUCTED AFTER THE CONTRIBUTING DRAINAGE AREA TO THE POND IS COMPLETELY STABILIZED. IF THE PROPOSED POND SITE WILL BE USED AS A SEDIMENT TRAP OR BASIN DURING THE CONSTRUCTION PHASE, THEN THE FACILITY WILL BE DEWATERED, DREDGED AND RE -GRADED TO DESIGN DIMENSIONS AFTER THE ORIGINAL SITE CONSTRUCTION IS COMPLETE. 3. INSTALL E&S CONTROLS PRIOR TO CONSTRUCTION OF THE BASIN, INCLUDING TEMPORARY DE -WATERING DEVICES AND STORMWATER DIVERSION PRACTICES. ALL AREAS SURROUNDING THE BASIN THAT ARE GRADED OR DENUDED DURING CONSTRUCTION SHALL BE PLANTED WITH TURF GRASS, NATIVE PLANTINGS, OR OTHER APPROVED METHODS OF SOIL STABILIZATION. 4. CONTRACTOR SHALL EXCAVATE THE CORE TRENCH AND INSTALL THE SPILLWAY PIPE DURING THE ESC PHASE. 5. CONTRACTOR SHALL ALSO INSTALL THE RISER, OUTFLOW STRUCTURE AND/OR AND BARRELS) DURING THE ESC PHASE TO ENSURE THE TOP INVERT OF THE OVERFLOW WEIR IS CONSTRUCTED LEVEL AT THE DESIGN ELEVATION. 6. THE CONTRACTOR SHALL THEN CONSTRUCT THE EMBANKMENT AND ANY INTERNAL BERMS IN 8 TO 12-INCH LIFTS AND COMPACT THE LIFTS WITH Tillaill APPROPRIATE EQUIPMENT. 7. UPON COMPLETION OF THE EMBANKMENT GRADING, THE CONTRACTOR SHALL EXCAVATE/GRADE UNTIL THE APPROPRIATE ELEVATION AND DESIRED CONTOURS ARE ACHIEVED FOR THE BOTTOM AND SIDE SLOPES OF THE BASIN. M 8. CONTRACTOR SHALL THEN CONSTRUCT THE EMERGENCY SPILLWAY IN CUT OR STRUCTURALLY STABILIZED SOILS. 9. THE CONTRACTOR SHALL THEN FINISH CONSTRUCTION OF ALL OUTLET STRUCTURES, INCLUDING DOWNSTREAM RIP -RAP APRON PROTECTION. (� 10. THE CONTRACTOR SHALL NEXT STABILIZE EXPOSED SOILS BY HYDROSEEDING OR SEEDING OVER STRAW. 11. THE CONTRACTOR SHALL THEN INSTALL THE APPROPRIATE BASIN LANDSCAPING IN ACCORDANCE WITH THE APPROVED PLANS. N FACILITY MAINTENANCE: MAINTENANCE OF DETENTION BASINS ARE DRIVEN BY ANNUAL INSPECTIONS THAT EVALUATE THE CONDITION AND PERFORMANCE OF THE FACILITIES. DURING w THESE INSPECTIONS THE FOLLOWING TASKS SHALL BE PERFORMED BY THE CONTRACTOR IN THE FIRST YEAR FOLLOWING INSTALLATION, AND THE OWNER THEREAFTER: 1. MEASURE SEDIMENT ACCUMULATION LEVELS IN THE BASIN. 1 2. MONITOR THE GROWTH OF THE GROUNDCOVER AND ANY TREES AND SHRUBS PLANTED, AS APPLICABLE. RECORD THE SPECIES AND THEIR APPROXIMATE COVERAGE, AND NOTE THE PRESENCE OF ANY INVASIVE PLANT SPECIES, AS APPLICABLE. N Q O 3. INSPECT THE CONDITION OF STORMWATER INLETS TO THE BASIN FOR MATERIAL DAMAGE, EROSION OR UNDERCUTTING. 0+50 1 +00 4. INSPECT THE BANKS OF UPSTREAM AND DOWNSTREAM CHANNELS FOR EVIDENCE OF SLOUGHING, ANIMAL BURROWS, BOGGY AREAS, WOODY GROWTH, OR GULLY EROSION THAT MAY UNDERMINE EMBANKMENT INTEGRITY. N N 5. 6. INSPECT BASIN OUTFALL CHANNEL FOR EROSION, UNDERCUTTING, RIP -RAP DISPLACEMENT, WOODY GROWTH, ETC. INSPECT CONDITION OF PRINCIPAL SPILLWAY AND RISER FOR EVIDENCE OF SPALLING, JOINT FAILURE, LEAKAGE, CORROSION OR OTHER FAILURES. Uj 7 INSPECT CONDITION OF ALL TRASH RACKS, REVERSE SLOPED PIPES OR FLASH BOARD RISERS FOR EVIDENCE OF CLOGGING, LEAKAGE, DEBRIS ACCUMULATION BASIN C SPILLWAY OR OTHER FAILURES. W 8. INSPECT MAINTENANCE ACCESS TO ENSURE IT IS FREE OF WOODY VEGETATION, AND CHECK TO SEE WHETHER VALVES, MANHOLES AND LOCKS CAN BE 9. OPENED AND OPERATED. INSPECT INTERNAL AND EXTERNAL SIDE SLOPES OF THE BASIN FOR EVIDENCE OF SPARSE VEGETATIVE COVER, EROSION, OR SLUMPING. .W_I W 10. OWNER SHALL MAKE NEEDED REPAIRS IMMEDIATELY. J 0 FACILITY INSPECTION' APPROVED EMBANKMENT NOTES: AFTER AN INVESTIGATION OF THE SITE's SOILS, SITE VISITS, AN ANALYSIS OF THE SURVEYED TOPOGRAPHY MULTIPLE INSPECTIONS ARE CRITICAL TO ENSURE THE BASIN(S) ARE PROPERLY CONSTRUCTED. BECAUSE THE TIMING OF THE INSTALLATION IS DICTATED BY THE Z AND AN EXAMINATION OF VA DEQ APPENDIX A: EARTHEN EMBANKMENT (REQUIREMENTS CONTRACTOR, THE CONTRACTOR SHALL BE RESPONSIBLE FOR CONTACTING THE ENGINEER AND INSPECTOR PRIOR TO INSTALLATION. MULTIPLE SITE VISITS AND LLI vs. INSPECTIONS ARE REQUIRED TO BE SCHEDULED BY THE CONTRACTOR, WITH THE ENGINEER AND INSPECTOR, DURING THE FOLLOWING STAGES OF THE DETENTION \` W RECOMMENDATIONS), THE APPLICANT HAS PROVIDED A COMPREHENSIVE EMBANKMENT DESIGN THAT DOES BASINS' CONSTRUCTION PROCESS: NOT NEED A GEOTECHNICAL STUDY ATTHIS TIME. SUCH IS THE CASE DUE TO THE PRECAUTIONARY EMBANKMENT DESIGNS PROPOSED. A SUMMARY OF THE EMBANKMENT DESIGN REQUIREMENTS ARE LISTED 1. PRE -CONSTRUCTION MEETING t3O W BELOW, MANDATING THE CONTRACTOR MEET THESE REQUIREMENTS AT A MINIMUM. 2. INITIAL SITE PREPARATION (INCLUDING INSTALLATION OF PROJECT E&S CONTROLS) J r n V� 3. EXCAVATION/GRADING (E.G., INTERIM/FINAL ELEVATIONS) �y THE EMBANKMENTS SHALL HAVE A COMPACTED CLAY CORE WITH A CUTOFF TRENCH & BE IN ACCORDANCE 4. EXTENDED DETENTION BASIN INSTALLATION (E.G., INTERIM AND FINAL ELEVATIONS) LL WITH THE DETAILS SHOWN ON THIS SHEET. BERMS AND SPILLWAYS SHALL BE STABILIZED WITH EC-3 MATTING 5. INSTALLATION OF THE EMBANKMENT, THE RISER/PRIMARY SPILLWAY, AND THE OUTLET STRUCTURE(S). Q z & THE REMAINING DISTURBED SLOPES SHALL BE STABILIZED WITH EC-2 MATTING. ALL BERM FILL MATERIAL 6. PLANTING PHASE (WITH AN EXPERIENCED LANDSCAPE ARCHITECT PRESENT) = Q SHALL CONSIST OF MIL, CL, SC OR GC SOILS & BE FREE OF WOOD, ROOTS, ROCKS OR ANY OTHER NON 7. FINAL INSPECTION (DEVELOP A PUNCH LIST FOR FACILITY ACCEPTANCE) / 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. EW-1,1APC A� SEE DETAIL A-\ [mill •4 BARS 0 12" C-C EACH WAY, EACH F) FLOW �.•. .'A' ---- FRONT ELEVATION A- SEE DETAIL B EACHBARS . 8" C-C 1'-2"' EACH WAY, EACH FACE. NOTES: I. CONCRETE TO BE 4000 PSI MINIMUM COMPRESSIVE STRENGTH. 2. IF PPE IB TO BE SKEWED THE OPENING WILL BE ADJUSTED TO ACCOMMODATE SECTION A -A ANGLES UP TO 45'' 3. REINFORCING STEEL IN ACCORDANCE WITH ASTM A-615 (REINFORCING BARS). 4. PPE OPENINGS IN PRECAST DRAINAGE UNITS SHALL NOT EXCEED 4 INCHES AT ANY GIVEN POINT BETWEEN THE PPE AND THE PRECAST UNIT. DO N01 A. 5. DIMENSIONS SHOWN ARE MINIMUM. ACTUAL MEASUREMENTS MAY VARY WITH NNVERET MANUFACTURER'S TOLERANCE. 8. IN NO CASE SHALL TOP OF ENDWALL PROJECT ABOVE FILL SLOPE, DITCH SLOPE, OR SHOULDER. . 7. HEADWALL TO BE BEVELED IN ALL AREAS EXCEPT WHERE A CONFLICT WITH INVERT OR WINGWALL OCCUR. B. BEVEL EDGE IS REWIRED ON THE HEADWALL AT THE INLET END OF THE CULVERT. SHAPE TO BE HEADWALL AT OUTLET END MAY BE EITHER SQUARE EDGE OR BEVELED. BEVELED WITH MORTAL c 9. Y'i' CHAMFER MAY BE PROVIDED ON ALL EDGES AT MANUFACTURER'S OPTION. DETAIL A I4"5 W? ENDWALL FOR CIRCULAR PIPE DIAMETER OF PPE CULVERT D 12" 15' 18" 21" OR 24" 2T' OR 30" 33" OR 36" H 2'-0" 2'-3" 2-6" 3'-2" 3`10" 4'-4" L 4'-0" 5'-0'. B'-0" D'-O" 12'-0" a 0'-1/4" 0'-1Ti" FS 0'-2" 0'-2%2" 0'-31/i' 0'-3�i' b 0'-1" 0•-11/4" 0.4/2" 0`2" a'-21/i, D,-3„ DETAIL B r:a_r:•M ENDWALL FOR ELLIPTICAL PIPE SIZE OF ELLIPTICAL PIPE CULVERT (SPIN x RISE) S x D 23" x 14" 301. x 19" 34" x 22" 3B" x 24" 42" x 27" 45" x 29" 49" x 32" 53" x 34" H 1'-10.. 2'-4" 2-7" 2'-9" 3--l" 3'-3" N-8" 3'-B„ L 5'-5" 7'-2" 111 Ill 10'-2" 10'-111, 12--1" 12'-11" a 0'-2%a" 0'-3�/i' 0'-3'/2" 0'-4" 0'-4%i' 0`04' O'-5" O'-51/2" b 0'-2" 0'-2%2" 0'-2%• O'-3" O'-3%2" 0'-3�i• 0'-4" 0'-4%2" �VDOT PRECAST ENDWALL FOR PIPE CULVERTS SPECIFICATION ROAD AND BRIDGE STANDARDS RENCE SHEET 1 OF 1 REVISION DATE 12" - 36" CIRCULAR AND 23" x 14" - 53" x 34" ELLIPTICAL PIPES 105 101.02 VIRGINIA DEPARTMENT OF TRANSPORTATION 302 36" Riser Stc)rrnRax- ROUND SERIES TRASH RACK CONCRETE MANHOLE STANDARD 13D INCH RACK SHOWN DIMENSIONS IN INCHES N[]PF STRl,..rljR.A1 PLASnI:®Y / PLAoric S".5�J-iogs,IHG- ���i••, REIWOVABLE FOR ACCESS A I l - I + �- .. ,.... I , PLAN SIDE VIEW I S O'METRIC StormRaxTM' lnd Series forCc-ncrete Manhole Part Inc. l A dim i3 Din C Mln I D Min DID RS•24 17% 14°i4 28 24 30 �36 2114 14 40% 34 43 I 27 1A S4 . 4R 57 RS-60 27% isYA €�6% 50 70 Pil lC SQIutlons; Inc- CUSTOMER: PC) B..43M. VJLn�h-tc . VA226= ' 23$ �[1H�e'e Rd, 4W4rj-te er, VA 226Q3 W7) 877.5717 Pil It PRNEiT_ i-M 722-2219 fuc http5ifWWw.pilasttc _4DW6 ,,corn CONCRETE STRUCTURE DIMENSION$ INSIDE STRUCTURE DIMENSION OUTSIDE STRUCTURE DIMENSION AVAILAB LE OPTIONS GROSS 13RAG I N G FOR OV ERHA NG HDPE ANTI -VORTEX PLATE GATE: pRf4VfN BY. AAPT) Ill DETAIL: V W > LU W Q U1 0 � l�l/ LL Q O W � � zW V I LL JW O J�z cq LU 0 LIJ U (D N LU J F- F- � ,w-, w w d [n JOB NO. 132091 SCALE AS SHOWN SHEET NO. 10