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Home My WebLink AboutWPO201500068 Plan - Stormwater Stormwater Management Plan 2015-08-04OWNER PER ALBEMARLE COUNTY RECORDS TMP 03209-00=00-05000 (PROPOSED SWM FACILITIES #I. L #3) ROUTE 20 LLC PO BOSS -5546 CHAR 0TrESVITLLE, VA 2290S TMP 03200-00=00-05600 (PROPOSED SWM FACILITY 2) UPTOWN VILOAOE LLO C/O UNITED LAND CORPORATION PO n,OX 5-548 CHAPLOTTESVILLE, VA 22905 DEVELOPER MR. WENDELL WOOD 2315 SEMINOLE LANE CHARLOTTESVIILLE, VA 22901 ENGINEIR COLLINS ENGINEERING 200 GARREETT STREET, SUITE K CHARLOTTESVIILLE, VA 22902 CONTACTo MR. SCOTT COLLINS 4534.293.3719 TAIL PARCEL PART OF TMP 03200-00-00-05000 & TMP 03200-00-00-05600 ACREAGE 42A3+ aco ZONING NEIGHBORHOOD MODEL DISTRICT PROPOSED USE CONVERT THREE SEDIMENT BASINS TO SWM FACILITIES DEVELOPMENT DENSITY N/A PROPOSED MAXIMUM LOT COVERAGE (IMPERVIOUS COVER)- NO IMPERVIOUS AREAS ARE PROPOSED WITH THIS PLAN, HOWEVER THREE SWM FACILITIES ARE DESIGNED FOR FUTURE IMPERVIOUS AREAS/CREDIT, PHASING- THIS PLAN, WHICH PROPOSES THE CONVERSION N OF THREE SEDIMENT ,PASINS TO SHIM FACILITF.S, SHALL OCCUR IN ONE PHASE. TOPOOPAPHY/SURVYEY- TOPOGRAPHY CREATED FROM AERIAL SURVEY PROVIDED BY LO'UISA AERIAL SURVEYS, INC IN JUNE 2097. SURVEY INFORMATION PROVIDED BY PIVANNA ENGINEERING & SURVEYING, PLC. TOPOGRAPHY FIELD VERIFIED BY COLLINS ENGINEERING 2015. ASRIIILT SURVEY OF EXISTING SEDIMENT BASIN CONTROL STRUCTURES AND SURROUNDING S5TORM SEWER PROVIDED BY LINCOLN SURVEYING IN DUNE OF 201S. BENCHMARK- EXISTING TOP OF BOX ON TOWN CENTER DRIVE, ELEVATION-583.04°, SHOWN ON THIS & IEET� DATUM- ELEVATIONS BASED ON NAIL 83 DATUM. FLOODPLAIN INFORMATION- THIS PROPERTY 15 LOCATED IN ZONE ®X° ASS SHOWN ON THE FLOOD INSURANCE ATE MAP, MA NUMBER 51003CO140D, EFFECTIVE DATE FEBRUARY 4, 2005. , T REAM BLUFFERS- NO STREAM BUFFERS EXIST ON THE SUBJECT PARCELS PER ALBEMARLE COUNTY OIS. WATERSHED- THIS SITE DRAINS TO THE POWELL CREED WATERSHED. EXISTING VEGETATION- NX THREE SWN1 FACILITIES PROPOSED ARE CURRENTLY SEDIMENT ESINS, ACCESS- TOWN CENTER DRINE SHALL SERVE AS ACCESS TO THE SWIM FACIL_IFIES. SETUACM�- N/A MAs9MUM STRUCTURE HEIGHT- N/A MINIMUM BUILDING SEPARATION- N/A NO PARKING IS PROPOSED OR REQUIRED WITH THIS PLAN NO LIGHTING IS PROPOSED OR REQUIRED WITH THIS PLAN NO SIONAOE IS PROPOSED OR REQUIRED WITH THIS PLAN SITE ARIAS- SEE SWM DETAILS FOR EXISTING & FUTURE IMPERVIOUS LOADINGS NO CEMETERIES WERE FOUND DURING THE FIELD INVESTIGATIONS OF THESE PROPERTIES. CRITICAL SLOPES- NO ADDITIONAL CRITICAL SLOPES ARE PROPOSED TO BE DISTURBED WITH THIS PLAN. LANDSCAPING IS PROPOSED FOR THE AQUATIC BENCH, WHERE APPLICABLE. CONTRACTOR SHALL VERIFY LOCATION AND ELEVATION OF ALL UNDERGROUND UTILTTIES SHOWN ON PLANS INAREAS OF CONSTRUCUON PRIOR TO STARTING WORK. CONTACT ENGINEER IMMEDIATELY IF LOCATION OR ELEVATION IS [DIFFERENT FROM THAT SHOWN ON THE PLANS, IF THERE APPEARS TO BE A CONFLICT, AND UPON DISCOVERY OF ANY UTIL11TY NOT SHOWN ON THE PLANS. NOT PIAMEA€TdORIT➢''OVER CONTRACTOR1 WORK SAff y romp_ t t a7T0ffl5, SCHEDULES, OR C1MP-AWNCE GN.f HY LAW AND REGULA71O S WES CAI -A 1? OTASSU��JF RS PON5101MYFO3ANYCONST`, UCTICY11 BEGUN ARIOR TO PLANAPPROVAL. Watershed S'I,IfT3mary Pre -Development FuturEe-Development Area 1-YearOutfall 2-YearOutfall Area I-YearOutfaall 2-YearOutfa11 Description (acres) Cif (cfs) (cfS) (acres) CN (cfS) (cfs) I A A 12.94 55 2.45 3.36 12.94 81 0.48 0.57 OA B 0.005 55 2.03 2.87 8.85 0® 0.40 0.52 DA C 9.60 55 1. cc) 2 2.49 9.60 000 0.39 1.76 PROFFERS FROM ZMA 1 92-1,4 FOR TMP 03200=00-00-05600 L. THE MOBILE HOME PARK IS PROFFERED FOR A PERIOD OF NOT LESS THAN FIFTEEN YEARS FROM THE START OF THE DEVELDIPMENT IN ACCORDANCE ai`OIITH THE COMPREHENSIVE PLAN. DUPING THAT PERIOD OF -nME, THE PROPERTY SHALL NOT BE AVAILABLE ITO ANY OTHER R-15, RESIDENTIAL USES EXCEPT NOTHING CONTAINED HEREIN SHALL PROHIBIT THE ZONING ADMINISTRATOR FROM AUTH3 ORIZING USES DEEMED ACCESSORY AND SUBORDINATE TO THE MOBILE HOME PARK, IN THE EVENT THE OOND ONS OF SP-93-13 ARE NOST MET, OR ATTHE TIME OF EXPIRATION OF SP-93-13 IN ACCORDANCE WITH SECTION ` 1.2.4.4 OF THE ZONING ORDINANCE, THE APPLICANT SMALL PERMIT THE PROPERTY TO BE REZONED TO PA, RURAL AREAS, BY THE BOARD OF SUPERVISORS AND THEREAFTER THE PROPERTY SHALL ENJOY ALL PA USES. FOR THE PURPOSES OF THIS PROFFER, THE TERM "START OF DEVELOPMENr IS DEFINED AS THE DATE OF ISSUANCE OF THE FIST MOBILE NODE BUILDING PERMIT. NOTHING HEREIN SHALL PROHIBIT THE HOARD OF SUPERVISORS FROM GRANTING AN E3 ITENSION OF TdE EXPIRATION DATE OF SP-93-13 IN ACCORDANCE WITH SECTION 3t2AA OF THE ZONING ORDINANCE. 2. THE FRONTAGE OF ROUTE 29 CONTAINING TAX MAP 32, PARCELS 43A, 43, 42E, 42D, 42B, 42C, 42A AND TAX, MAP 46, PARCEL-L 5, SHALL CONTAIN NOT MORE THAN THREE ENTRANCES. THE COUNTY MAY REQUIRE CLOSURE OF ANY OaSTING ENTRANCES AT THE 111E OF ESTABLISHMENT OF ANY NEW ENTRANCE SUCH THAT THE TOTAL NUMBER OF ENTRANCES DOES NOT EXCEED THREE. 3. AN ACCESS ROAD BEPPIEEN THE MOBILE HOME SALES AREA AND MOBILE HOME PARK SHAH BE DEVELOPED AT THE TIME OF ESTABLISHMENT OF THE MOBILE HOME SALES USE, THIS ACCESS ROAD SHALL BE USED ONLY FOR THE MOVEMENT OF MOBILE HOMES BETWIEEN THE nVO DBEs AND FOR EMERGENCY ACCESS, CONDITIONS FROM SP 1993-14 FOR TMP 03209-00-00-05600 I. THE INVENTORY SHALL INCLUDE MOSII E HOMES WHICH MEET THF. NOISE AT-TENOATION )TPANDARD a OF ZMA-92-14. LYMEAD T ICENTER k RIO" MAGIS"'TERIAL I A AL'�D'EMARLE'Lr*."O"U*'UlhNI'TY, VIRG"'IN A 0- � 77L13--:� ` ;1- 1 l lj Sheet List Table Sheet Number Sheet Title I TITLE SHEET 2 STORMWATER MANAGEMENT PLAIN- SWM FACILITIES 1 & #3 3 STORMWATER MANAGEMENT PLAW SWM FACILITY #2 4 STORMWATER MANAGEMENT DETAILS S STIORM ATEP, MANAGEMENT DETAILS 61 TOTAL SHEETS TH 0- SCOTT R. COT i INS PTO. 35791 U) 0 E-=9 J --7t s b � o m JOB NO. 102036 0 SCALE j S NIA U C3 0 SHEET NNO. ) n u) av r, - " - 11 � \fil l- i IVIi I I � I I ,� -,,1 'I- - - "k -� - -,� <� , , / I,- � 1I I',' --"--[ f - - -- -, Irl -- ��- - ---� I - -- , " ,`�,,,� � -/ /1.1il' - � ,- y, 1 I ---,--, N -- -- - p, I I,j f I I'\ I 1''e'. �, Z , - 4fl- 11 . - V ,l"'�f,'�, -- -- ', I , � b�,Q,11 -----,/ If F , " I , ----- -- I "I � \, , j I'll -I',--- -- I - " (`- ,_ � �\--- ---. -.- �, , , . % I \ � , '� 1�� , I " I i! 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M� .;06�, , I I h1l � ,-� ) / - f�-�;� Y--",--R- ,�x-,�,v j �, p",�j"-&--- . --;""",L/,�---jj l"7V i�, - l "',y ----, �,17- 1 i�r�,� , , I , ; ," "',,- -- I , f, ,,--! �-'7 I- ii ll 17 I- , 11 / �-�,,-Ar----'---/ I "I I � , ,I �- 1� - --1,,I 31 ", /-. I�� II--j ,� - . I I 1j �,--.- - I .... I i Y---, I,,,, -�. , - ��-�l i " .1 '- �,r,-lr l� -�:It�:Z�--,-' If �-, , ,:" �� 1� ,; � - j I-- I ,I,yli, -�'�III l ( I / ------- L-j-1, 1��§Y A�,-,� SUBAREA A STORMWATER MANAGEMENT NOTES: "\,-"i, ---- f- / ',� 1 FUTURE , ! I , g -�, - , �y it, 8-a""',", -, -a- I,24,j, f :15,,-, / s" �,:,,,Y ,,�,,�-�- ��, i- THE FUTURE DEVELOPMENT, AS CONCEPTUALLY SHOWN IN] SUBAREA A,WILLGENERATEA ,�� _ 1, '"' , Ip-,- - -- ill /---, i-,�-:-�E,ff h-,,"It -� -.','f -, -i�T i, 1 ,�,,,---�i��,f �,,,-,, -,, �, -, �Ir /,�f f ., FUTURE IMPERVIOUS AREA FOOTPRINT OF APPROXIMATELY 200,500sf. PLEASE NOTE, � ''-,� �Iihq ' �-�-,,f ,,',,��, ""11 , I-- / - � I --,- 11 ] 1 j.- I -- SUBAREA A CONTAINS AN ADDITIONAL 110,92S Sf OF EXISTING IMPERVIOUS AREA WITHIN , ,,, i ! " - '. - N61" /'�� , ; - u - I�, , . � ,,,� "' '--j , " -�, 1 " _z;'I, fi� ,j , . - , 1, �, � ,-- ITSWATERSHED. hl-b( - /I -) "" A,.�nm '%'!",,' = A -1 2. THE PROPOSED SWIM FACILITY #3. SHOWN WITH THIS PLAN IS SIZED FOR A FUTURE WATER I- , , P�H �, ,, F�-� ,", - I � I 1 '4",ij -�,-,-,i I-` " QUANTITY CREDIT OF 3111,425 Sf OF IMPERVIOUS AREA WITHIN SUBAREA A (200,500 + 1,-.- I " , , I - I, � "'I 'pli"it --l' - 11.0,92S). THIS EQUATES TOA CN VALUE OF 08i FOR SOIL TYPE B, PLEASE SEETHE ATTACHED `1 .: -"--, f 1:�--- - - 7:� " �, j---y, / -,--] - I -1 ', 1� N ',--4-�,.--,--, SCS TR-55 WORKSHEETS FOR ADDITIONAL DETAILS. ALSO, THE ATTACHED CALCULATIONS I ,,--77, VVII ENSURE CHANNEL PROTECTION COMPLIANCE IS MET AND THE PEAK OUTFLOW FROM THE v I \� � / r � \-" , 2-YEAR STORM EVENT IS LESS THAN FORESTED CONDITIONS FOR THE DOWNSTREAM / "", �) i I IW If RECEIVING CHANNEL. PLEASE SEETHEATTACHED ROUTING CALCULATIONS SHOWING / / I/ /W I EVIDENCE OF THIS FACILITY's CAPACITY AS WELL. i / 111111� i i ,,,,, 1,1, 3. SUBAREA A's DEVELOPMENT, IN ACCORDANCE WITH ALBEMARLE COUNTY ENGINEERING's -- ---, / /I li'ff , 11 PRIOR DIRECTION, SHALL ADHERE TO THE CURRENT SWM REGULATIONS FOR WATER - - ----- if, )� �: 1-71 I 1� ... zj��-7-- -,� --- :- -�:ff-,-,, I i - -�--: -�- ,I -Y CREDIT. ANDWHILETHE PROPOSED SWM FACILITYCANNOT FULLY SATISFYTHE ,� -- �� QUALI1 � I rili;-.��:�"Z-,�-_ - ,� .1 - �-, I 1--i �,�z--11111 ,-.-- � � I -1 -� -- "' WATER QUALITY REQUIREMENTS FOR ITS FULL BUILDOUT, THE PROPOSED SWM FACILITY . I ------ �'-- ��4-7:7�� "I ( #:L PROVIDES PARTIAL WATER QUALITY CREDIT. SWM FACILITY #i PROVIDES A FUTURE - � _ t �, ,_ �, -- -- . I r 03POO-1 -.-�, I - - - - - - " I � , .- '.., , -:�I- - T�l I 1 I I "", 1 4 f I ,V1, I/ i -i'-, 1 1, I I --,l i ,�,i, �, -�,, I \ , , -- � , - �E� _71--j- 7 TREAT rz ) 1 �-��'-�,�----,-"-�:�--,-�,;""k ww-�71 i / ---- - -- __, � " �� - I 1111.� 1`1-,-/ I,/ I f --j t �� f � I l IT I \11, - - I ,.1 I k ---L�: _ -- 1--�, z�� " , I I 1, / " - -1 1-*,I�1;3 ,- ,- zzz�,,-_;:� M ENT VOLUME CREDIT OF 33,500 cf, WITH A CORRESPONDING LEVEL:L TOTAL . -;�ir�,,,,,�,� -- � I I2l I `�' , � j-'- - I I , - 1, --I ---I i, - - /' - I �j� i it , -1 , I il ,", I- , I , / - - � \ I 1 , -74;-,�- ,1�17� I AL 'p- - i "I � , - N 11 , V-a-,- , i. L-, -1 I I i, /I - I 1 4��--, - -1. � I �--41, I �- I 11 1. ,-- -- - . . 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THE FUTURE DEVELOPMENIT IN SUBAREA B WILL GENERATE A FUTURE IMPERVIOUS AREA FOOTPRINT OF APPROXIMATELY 5o%, OR 4.43 ac. THIS IS CONSISTENT WITH SUBAREA C AND ACCURATELY DOES NOT INCLUDE TOWN CENTER DRIVE DUE TO ITS EXISTING INFRASTRUCTURE. 2. THE PROPOSED SWM FACILITY #2 SHOWN WITH THIS PLAN IS SIZED FOR A FUTURE WATER QUANTITY CREDIT OF 4.43 ac. OF IMPERVIOUS AREA WITHIN SUBAREA B (So% OF 8.85 ac.). THIS EOUATES TO A CKI VALUE OF 8o FOR SOIL TYPE B, PLEASE SEE THE ATTACHED SCS TR-55 WORKSHEETS FOR ADDITIONAL DETAILS, ALSO, THE ATTACHED CALCULATIONS ENSURE CHANNEL PROTECTION COMPLIANCE IS MET AND THE PEAK, OUTFLOW FROM THE 2-YEAR STORM EVENT IS LESS THAN FORESTED CONDITIONS FOR THE DOWNSTREAM RECEIVING CHANNEL. PLEASE SEE THE ATTACHED ROUTING CALCULATIONS SHOWING EVIDENCE OF THIS FACILITY's CAPACITY AS WELL. 3- SUBAREA B's DEVELOPMENT, IN ACCORDANCE WITH ALBEMARLE COUNTY ENGINEERING's PRIOR DIRECTION, SHALL ADHERE TO THE CURRENT SWM REGULATIONS FOR WATER QUALITY CREDIT. AND WHILE THE PROPOSED SWM FACILITY CANNOT FULLY SATISFY THE WATER QUALITY REQUIREMENTS FOR ITS FULL BUILDOUT, THE PROPOSED SWM FACILITY - 34'2 PROVIDES PARTIAL WATER QUALITY CREDIT. SWM FACILITY #2 PROVIDESA FUTURE TREATMENT VOLUME CREDIT OF 25,000 cf, WITH A CORRESPONDING LEVEL j. TOTAL PHOSPHOROUS MASS LOAD REMOVAL OF i-%. 3 NOTE - BECAUSE IMPACTING THE EXISTING GREENWAY AND EMBANKMENT DOWNSTREAM OF SWm, FACILITY 42 IS NOT IDEAL, THE DRAINAGE FROM SWM FACILITY #2 IS PIPED TO THE EXISTING 48" STORM SEWER UNDERNEATH TOWN CENTER DRIIVE WHERE IT ULTIMATELY OUTFALLS INTO SWM FACILITY #3.. AND BECAUSE THE TWO PROPOSED SWM FACILITIES ARE LINKED VIA THIS EXISTING 048" RCP BENEATH TOWN CENTER DRIVE, SUBAREA B HAS THE OPTION TO UTILIZE DOWNSTREAM WATER QUALITY AND/OR QUANTITY CREDIT FROM SWM FACILITY ft. SUCH A SHARED USE WOULD HAVE TO BE EVALUATED BY COUNTI(ENGAINEERINIGA AT THE TIME OF THE PARCEL(S)' FUTU RE DEVELOPMENTOURING THE FUTURE FINAL SITE PLAN DESIG, N STAGE. 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Elevation (ft) Total Facility Area ContoursVolume (5f) (cf) 516 2,719 0 517 5,576 4,063 518 9,045 11,304 519 10,495 21,065 520 14,635 33,573 521 16,77.E 49,263 S22 19,280 67,27g 523 21,290 87,555 524 23,695110,037 525 25,639 134,698 526 28,115 161,565 Motes: 1 A minimum forehay volume depth of 4"with an aquatic bench 4' Wide, 2' deep has been provided. 2 A minimum forebay Volume of 15% of the total Tv has been provided. 3 A 10' Wide aquatic bench 18" in depth 'has been Provided. 4 An safety bench is not required due to a maximum permanent pool depth of 4'. 5 The minimum treatment volume required has been provided below the MWSE. LEVEL 1 EXTENDED DETENTION BASIN DESIGN 8 CREDITS: Treatment Volume Credit for Level 1 Facility 41,000 cf �r 1 e col iVlicro col -r Forebay) 6 _5 ' �- in Permanent P Minimum Treatment Volume Required ( y) ! Treatment Volume Provided In Permanent Pool (Micropool + Forebay) 20,745 cf Minimum Pecenta;e of Forebay Volume Required (15l of TV) 15 1 Percentage of Forebay Volume Provided (Relative to Tv) 15 STORM�JVATFP, MANAGEMENT FACILITY GRADING fAS SHOWN) Elevation (ft) Area of Forebay Cell Contours (sf) Volume (cf) 514 922 0 51-5 1,211 1,063 516 1,530 2,431 517 1,891 4,138 51� 2,182 6,221 518.5 2,487 7,413 519 2,912 8,762 520 3,324 11,877 521 3,960 15,515 S224630 19,805 523 - - 524 - - Elevation (ft) Area of ivicro ®ol Cell Contours (sf) IDlafe (cf) 514 51 0 515 122 84 516 218 252 517 340 528 518 486 939 518.5 - - 519 - - 520 - - 521 - - 5_2_✓ 523 - - 524 - - Elevation (ft) Area of Extended Detention Cell Contours (sf) Volume (cf) 514 - - 515 - - 516 _ - 517 - - 518 _ - 518.5 7,.S77 0 519 8,451 4,005 520 9,028 12,743 521 9,883 22,195 522 1!!_1 4 --� 32 491 ➢ 523 i 1 _® 064 1 �➢6 _64 524 18,326 63,754 Elevation (ft) Total Facility Area Contours (sf) lolarsae (cf) 514 973 0 S15 1,333 1,148 516 1,748 2,684 517 2,231 4,669 518 2,768 7,163 118.5 10, 064 10,182 519 11,363 15,535 520 12,352 27,389 521 13,843 40,400 0 5 - c � 2� 1 _5J 3;-4 55P 067 5 23 I T ,ra 864 71,165 524 3 1,326 88,755 1 52r P4OPOSFD IATOPQ�_DAA .��_.. 52� oo.FOR O RIPRA i W IR A C 2' WIDE FOREBAY _ - BAY SHAIL( HANJE LIMED ad WIDE EST ELc ROCKO FACILITYABOVE , _ 1_ T�(IMiTE TT11,N RE�OVEDDFISSU FRQM HAMERING TCROPPINGSWIT � iMWSE 5�>0', Wt{iICH TTS SHAD- � ES REShLTING SIf1ALL BE S iN IS �� ALED - _.. ��-_...._�...�-_..__._ ...__ 525 w/ .... Sal 00' W TH CON RETF g{ WATER IGHT•-- GRADE � / � \ 520 520 PROPOED DEEP FO' 4e EBA r -_ _ ....__ _..._ �f _ - ® �� ....-__ ..._ _.._ 1 __..__.._..._.__ _ PROPOSED ao' W' AO _ ... OiJTRA DE, 18" D ATIC BE( _---. f TOR SN EP C H LL GRAD UTILIZ EXISTIG 515 5151 3 PROPOSE MWSEI= 520' (MAX. I 512 PERMA ENT POOI- DEPTH °) 512 I > >p UJ1 d� co O d'`m 06 Imo• �� 0 � 010 cal LO - N LO ISM Ld LL_ 0+50 1 +00 1 +50 2+00 2+50 3+00 PROPOSED /�� 525 i TAP OF DAM1 y /- 43� 520 520 EXISTING__" TOP OF DAM 515 51 0 LO W Ld 0 LO LLI 0450 0+75 Technical Builletin T Minimum Standard 3.02 , /9"::S9.� o p1.u4x -d Ya VF' nth 5»' fevo&n>l a-i,f�J" moo. 3tcles a..� -.• P'k]-r�x€di w6., 1s%ltiasl ;tL@r G44 rfS, Yti. by 91s zi uIT gym, hi�}t b tt� 0 _ gas ------------ I � i Ua'L+1 (OR EQUIVALENT) TDi-3 530 -PROPOSED 43' WIDE GRASS LINED EMERGENCY SPILLWAY CREST I ELEV.�524-66' (EXISTING TOP OF DAM�S7_6t).SPILLWAY SIDE SLOPES SHALL HE 4:1 OR FLATTER TO PROVIDE A SMOOTH VEHICULARTRANSITION - - T� ITI 525 ALONG THE ACCESS ROAD TO - - PROTECT THE GRASS MED SPILLWAY, LI4 530 PROPO�ED 520 1 GRAD 520 LdLo 0 Lea �LLI N r� 0+50 0+75 \ PL }�'A' 02,0, M_ any HN TROD 1a-T9ON ,i%PFERCRC .a. F FfELM EMBAtill{AMENT fill 1.11 Al 4, min to of mzk # 1 TYPICAL HOMOUNEW, rri L I;taltla 'I f flmt HUAN01 ( alit fi 9 r TOE DFRNI'141 Ganoral Construction_ notes for Stormw ater Manaornant Ploaaa 1. All darns and constructed fill to be within 957. of maximurn dry density and 2%, of optimum moisture content. All fill material to be approved By a geotachnical engineer. A geotechnicai 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 Uhe vita is stabilized, and permission has been obtained frorn the County erasion control inspector, 525 EXISTI PLUG EXISTING DEWATERI'NG ORIFICE OPENINGS AT ELEVATIONS 512.55' � 52a.62'. 520 INSTALL ONE 03" LOW FLOW ORIFICE w/AN f INVERT @ 520.00', ONE 0,." MIDFLOW ORIFICE -� _._�- wl INVERT @a 523.0' & RAISE THE EXISTING 048" E RCP RISER STANDPIPE RIM ELEVATION TO 523.66'. UTILIZE EXISTING TRASH RACK. �j v PROFILE SCALES: 5o' (H) I I { I� {{{ 1 ll I➢ I . - PROPOSED 43' WIDE GRAS! EMERGENCY SPILLWAY C ELEV,-522,75'. SPILLWAY SIDI SHALL BE 4- ._ OR FLATTER TO A SMOOTH VEHICULAR TRAI ALONG THE ACCESS ROAD PROTECT THE GRASS LIMED SI ! f \ I I I 1 1 i I 1 CONTRACTOR UTILIZEE XI. c EMBANKME RAISE EXISTING 2' WIDE FOREBAY vv/ATOP OF DAM ELEV.= EMBANKMENT 24n 522.00'. FOREBAY SHALL HAVE A RIPRAP LINED 525 TO FLFV_ r�;oz_ o' -➢n' 111/!DF 11VFIR gar/ A r'RF'T PI FV.=ci , LIMED. �Q 1 I i I PR�POSED 'DEEP REST : SLOPES PROVIDE ISITICiN 520 _...._._.. � �R. E 0 i SIDE SLO `, 520 'ILLWAY, EXISTING TOP fJF DAM I � "r ;� E SHALL------ � .__ TING N T.515 1 _.... _. _ . V �� _ P SE wY .� �A� D-- I _ _. EXISTING GRADE 1 E _P MIC!� 2:1 SIDE OPOOL SLOPES l (R M=52.8% F OOR=53- 510 i 510 W O y 0 0� O W Lj N T Q LLI LL Ln� LO J O 1+00 1+50 2+00 2+25 1 - 1 I, 1 l 525 ROP ;GRADEOSE \ ;, 1 3 i 520 �. .\1 J .... .... _.l I j 510I E TING 3 036 RCi'- _ > > °.. LdW ® ` ®ry �011yy 141PE4AP - LO 1-1 a OU_I_F AL a 0+50 1+00 i I� 'I i I' ➢ I l I I f 525 525 CONTRACTOR SHALL UTILIZE �-R'AISE FXI�TING EXISTING 0,8" RCP RISER EMBANKMP2,-, I STANDPIPE TRASH RACK & ( TO ELEV 24-00' ITS RIM ELE3f,--52a.o8'. 520 52011 CONTRACTOR SHALL REMOVE l ( PR POSED =XISTING 6" PVC PIPE INSTALLA' ) GRADE NEW 06' INVERTED HDPE PIPE AT THE RISER'S EXISTING OPENING INVERT INTO PISERm5-7.53'a INVERT AT MICROPOOL=5` 4,o0')o i �r :ONTRACTOR TO INSTALL A CAP O515 � � � 515 THE NEW G" 'PVC PIPE & DRILL A 03" LOW -FLOW ORIFICE OPENING AT E GRADE r t GRADE THE TOP OF THE CAP, CREATING A � � -=. � i 'LOW -FLOW ORIFICE IN�IERT=S�,�B° _ _ _ DEEP -� � MIQROPOOL s CONTRACTOR SHALL FILL EXISTING FACILITY IN SPECIFIC 510 510 LOCATIONS, AS SHOWN, FOR THE F_ --REATION OF A LEVEL a EXTENDED DETENTION FACILITY. 08 I � I � 508 > > FXISTIiNG 57' 030" �ALd RCP 0 3 % NVERTN O LTIW,IN=JIO 76!NV"-"R- ®`" 01jT 508,67' Lo L LO LLL 0+ 50 1 +'00 PA SCOTT R. COL INStZ No. 35791 0 H1`J " LU LU 1 � . Go LEVEL I EXTENDED DETENTION BASIN DESIGN & CREDITS: Treatment Volume Credit for the Level I Facility Minimum Treatment Volume Required in Permanent Pool (Micropool + Forebay) Treatment Volume Provided in Permanent PooIl (Nficropool + Forebay) Minimum Pecentage of Forebay Volume Required (15% of TY) Percentage of Forebay Volume Provided (Relative to TV) STORMWATER MANAGEMENT FACILITY GRADING (AS SHOWN) Elevation (ft) -_ Area of Forebay Cell contours (Sf) Volume (Cf) 516 512 0 S17 713 610 5 18 945 1,4365 519 1,206 2,509 520 1,492 3,955 521.19 1,831 5,829 522 2,341 7,515 523 - - 524 - - 525 - - 526 - - 527 - - 528 - -I - Elevation (ft) Area of 'Micropool Cell Contours (sf) Volume (cf) - 516 2 0 517 38 16 51,01 106 85 519 205 238 520 332 504 521A9 - - 522 - - 523 - - 524 - - 525 - - 526 - - 527 - - I 5200 - - i : I I _____j 25,000 cf 3,750 cf 8,019 Cf 15 % is % - Elevation (ft) Area of Exiended Detention Cell Contours (sf) Vo I u mel (cf) 1 51-6 - - 517 - - i 5100 - - I i 5i9 - - 1 520 - - � , 521.19 4,972 0 522 6,069 4,464 523 10,473 12,636 524 12,610 24,161 525 14,261 37,588 526 16,056 52,737 �i 527 18,340- 69,927 � 5200 - 2 IJI 2 6 89,647 Elevation (ft) Total Facility Area Contours (sf) - Vo I I -I m P_ (cf) 516 514 0 517 7511 629 518 1,051 1,526 519 1,411 2,752 520 1,824 4,365 521.19 6,803 9,185 522 88,410 15,334 523 10,473 24,757 524 12,610 36,282 525 14,261 49,709 526 16,056 64,859 527 1 00,348 82,048 528 I--------,------- 21,126 101,769 , = PROPOSED 0- w4" CL� III RCP RISER ::_�- i ---- I t I STANDPIPE RIM ELFV.m:52S.2S"w4j/ O'NE 05 1 � ; _____� ------.,.. !- I [VIIDFLOW ORIFICE AT ELEA1. 524-25 I& ONE : ,_� I LOW-FLOW06" INVERTED PIPE �1' 41 (IsAICROPOOL INVERT=,,7q_6.&, RISSER � 525 1 INVERT=5?o.d). INVERTED PRIDE SHALL ii i ____t 1 OUTFALL INTO 03" RISER OPENING AT :! EXISTIN� INVERT po�ao'. i WSE i I I ; � � I— - �:�__[_:= 4'DEEP MICROPOOL w/ _� 2:3. SIDE SLOPES i 520 1, 5� - �' (RIINI=52o', FLOOR=53.6') : : ___ ___ - 11-�_ A CONCRETE RISER FOUNDATION SHALL BE�______� ' I ::z INSTALLED TO PREVENT FLOATATION. RISER BASE & BARREL CONNECTION SHALL __j -1 BE FIRMLY EMBEDDED 9" I NTO A 24�'TFIICK CONCRETE FOUNDATION THAT IS 5'IN DIAMETER, THAT IS BURIED BELOW GRADE. 515 I , W !� GRADE _3 LLI W Q9 0 Ld Ll_ KISTING' I DRADE i I � I _� 2 I 530 i / - - I/ j - � , � I' __ 1 1 / I- I __ ---A- / � ____[ I / 1 ; It 1 __ -- I 1 525 .7---�--- --,--r-- / F i IN ,,- XISTING TOM, I TER-\ / QNRIVE DI W/ 04�5" 'N DO�,hii-IIISIREA,M PIIIE I M L_��_,__ I � I __,__,___,___I__ � --- --- T PRO �IOSED 2", IDE FO;EBA� I N, I TO! I OF DAIMI El FV ; 2. 00, I \ _T ....... __ ,__,_____,__L,_,___ 1 1 , I wl RIPRAP LIN-E-D �' , IDE 525 __ - i L_ \� - I -----)ALI ,-..REST,, ELE�V.=__2. �.5a' -"'-'- I �e ---- I - - _, EXISTING4/ \ ! ) i i ,3RADE \ � t i �_,___ L'1_1_\ ______L_______L - X, _____ ____,_ 1 I , , �p I I I !EXISTIN ----' i .. � q . 520 1 �NSE I � i i 1_1811i ____L_ L___ 11 I __ ... 515 k -ry, SED:L&_4_J'p0r_U175VI Trii-T�c & \RREL @ p�so% (I N�W RT , IN=F, 2o.d, INVERT OUT=� � p-9.48') 512 __ 1 I 1 515 5 >> 0 n _t ww __j -1 C� 6 0� w Uj C\I �q IN V") Lf) Ln 0 0 U 1-t- _1L. I I ---,---- ,0+50 1+00 1+50 111 � in � '',I&lg,�1-0,��M-�'ill��l"*\��I � illit��'� , , I - ' - ... � i j?EEPTOREEIP y--------------- - w/ 9-:2- SIPE SLOP I - 1--l- J CONTRACTOR SHALL �_ I \ I UTILIZE EXISTING i EMBANKMENT. �� I ,I i !D25 GRADE I V' TALLI� i2" 530 \ i _j i - PROPOSED 3&WIDEGARASS LINED EMERGENCY -- I \ I : SPILLWAYCR , F-5 r ELLV,�526.7_5'(EEXISTiNG TOP OF __� __ ; 520:1 DAM�p)8`zO.'S )PILLWAY SIDE SLOPES SHALL BE 41 OR FLATTER TO PROM DE A SMOOTH VEHICULAR TRANSITION, ALONG THE ACCESS ROAD & M I P ROTE CT THE E G RASS L1 IM E 0 5 P I LLWAY. 525 515 i � PROFILE SCALES-: ! It i i = 5, IV) 512 i J"=50'(H) -4- 0 V ) 0 Lo � C1,,I 0 0 0 1-- . . C� N 6 N - 00 c6 N N N CN � N N LO C14 Ln LO Lf) ,, in in - 0+50 1+00 1+50 2+00 2+25 gi -1 p �w " �/,-_ 1 � I- I all AN - M ( _1 i t-A . "'i , � % _� ip � 51, ,� �� (�O�� C �g� � , , ,� - , , , ( , , , , 0 - , , L EXTENDED DETENTION BASIN CONSTRUCTION NOTES: FACILITY PLANTING SPECIFICATIONS - LEVEL I 1. LEVEL I EXTENDED DETENTION BASINS SHALL HAVE A TURF GROUND COVER, SUCH AS GRASS, MULCH OR SOME OTHER FORM OF A VEGETATIVE GROUNDCOVER. LANDSCAPING BEYOND THIS IS OPTIONAL FOR LEVEL I FACILITIES, BUT IS NOT REQUIRED. 2� THE PROPOSED SIDE SLOPES OF THE BASIN SHALL BE A MAXIMUM OF 4:1 TO PROMOTE SETTLING & REDUCE THE RISKOF EROSION. THE PROPOSED FLOOR SLOPES, EXCLUSIVE OF THE MICROPOOL SHALL HAVE A SLOPE RANGING FROM 0.5%-I.O%. LEVEL2 1� THE PROPOSED SIDE SLOPES OF THE BASIN SHALL BE A MAXIMUM OF 4:1 TO PROMOTE SETTLING & REDUCE THE RISI(OF EROSION. THE PROPOSED FLOOR SLOPES, EXCLUSIVE OF THE IMICROPOOL SHALL HAVE A SLOPE RANGING FROM 0.5%-I.O%. 2. THE PLANT SELECTION SHALL PROMOTE DIVERSE WILDLIFE AND WATERFOWL USE WITHIN THE STORMWATER WETLAND AND BUFFER. 1 THE LANDSCAPING PLAN SHALL ALLOW THE POND TO MATURE IAITO A NATIVE FOREST IN IrHE RIGHT PLACES, BUT YET KEEP MOWABLE TURF ALONG THE EMBANKMENT AND ALL ACCESS AREAS. 4. WOODY VEGETATION SHALL NOT BE PLANTED OR ALLOWED TO GROW WITHIN 15 FEET OF'THE TOE OF THE EMBANKMENT NOR WITHIN 25 FEET Or' THE PRINCIPAL SPILLWAY STRUCTURE. S. A VEGETATED BUFFER SHALL BE PROVIDED THAT EXTENDS AT LEAST 25 FEET OUTWARD FROM THE MAXIMUM WATER SURFACE ELEVATION OF THE ED POND. PERMANENT STRUCTURES (E.G., BUILDINGS) SHOULD NOT BE CONSTRUCTED WITHIN THE BUFFER AREA. EXISTING TREES SHALL BE PRESERVED IN THE BUFFER AREA DURING CONSTRUCTION. 6. THE SOILS IN THE STORMWATER BUFFER AREA ARE OFTEN SEVERELY COMPACTED DURING THE CONSTRUCTION PROCESS, TO ENSURE STABILITY. THE DENSITY OF THESE COMPACTED SOILS CAN BE SO GREATTHAT IT EFFECTIVELY PREVENTS ROOT PENETRATIONAND, THEREFORE, MAY LEAD TO PREMATURE MORTALITY OR LOSS OF VIGOR. AS A RULE OF THUMB, PLANTING HOLES SHOULD BE THREE TIMIFS DEEPER AND WIDER THAN THE DIAIVIETER OF THE ROOTBALL FOR BALL -AND -BURLAP STOCK, AND FIVE TIMES DEEPER AND WIDER FOR CONTAIN' ER -GROWN STOCK. 7. 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. FACILITY CONSTRUCTION 1. AN ED POND MAY SERVE ASA SEDIMENT BASIN DURING PROJECT CONSTRUCTION. IF THIS I's DONE, THE VOLUME SHALL BE BASED ON THE MORE STRINGENT SIZING RULE (EROSION AND SEDIMENT CONTROL REQUIREMENT VS. WATER QUALITY TREATMENT REQUIREMENT). INSTALLATION OF THE PERMANENT RISER SHALL BE INITIATED DURINu I HE CON31 RUCI ION PHASE IF M� PALL PUSSIDLr, i-MMU UC31sJ I'd ELrVM I I UM 31"IMLL Dr- OF I V11 I In F I 11IML s,,LEM1,j0U I Ur I HE SEDINIEN I WASIN AND CUNVEKDIUN lu I FIC POST -CONSTRUCTION ED POND IN MIND. THE BOTTOM ELEVATION OF THE ED POND SHALL. BE LOWER THAN THE BOTTOM ELEVATION OF THE TEMPORARY SEDIMENT BASIN. IN THIS INSTANCE, THERE IS A PRESENCE OF ROCK BENEATH THE SURFACE AND THE SEDIMENT BASIINS HAVE ALREADY BEEN CONSTRUCTED. TO REMEDY THIS, THE PLANS PROPOSED FOR THE EXCAVATION OF SEDIMENT LADEN MATERIAL AND THE IMPORTATION OF FILL TO ENSURE APPROPRIATE SLOPES ARE MET AND ADEQUATE LANDSCAPING CAN BEACHIEVED WITH QUALITY FILL IMPORTED. APPROPRIATE PROCEDURES SHALL BE IMPLEMENTED TO PREVENT DISCHARGE OF TURBID WATERS WHEN THE BASIN IS BEING CONVERTED INTO AN ED POND. 2. ED PONDS SHALL ONLY BE CONSTRUCTED AFTER THE CONTRIBUTING DRAINAGE AREA TO THE POND 15 COMPLETELY STABILIZED. IF THE PROPOSED POND SITE WILL BE USED AS A SEDIMENTTRAP OR BASIN DURING THE CONSTRUCTION PHASE, THEN THE FACILITY WIILL 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 IDE-VNIATERING DEVICESitND STORMWATER DIVERSION PRACTICES. ALL AREAS SURROUNDING THE BASIN THAT ARE GRADED OR DENUDED DURING CONSTRUCTION SHAUL 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 .IN THIS INSTANCE, ONE OF THE BARRELS WAS BUILT WITH CMP� TO REMEDY THIS, AN OUTFALL STRUCTURE IS PROPOSED CONNECTING TO AN EXISTING INLET. THIS OUTFALLSTRUCTURE DOES NOT BREACH THE EMBANKMENT. 5. CONTRACTOR SHALL ALSO INSTALL THE RISER, OUTFLOW STRUCTURE AND/OR AND BARREL(S) DURING THE ESC PHASE TO ENSURE THE TOP INVERT OF THE OVERFLOW WEIR IS CONSTRUCTED LEVEL AT THE DESIGN ELEVATION. IN THIS INSTANCE, THE SEDIMENT BASINS WERE BUILT BEFORE THE FUTURE DEVELOPMENT WAS CONCEPTUALIZED. AS A RESULT, THE PROPOSED PLANS UTILIZE THE DEWATERiNG ORIFICES WERE POSSIBLE AND PLUG THEM OTHERWISE. 6. THE CONTRACTOR SHALL THEN FINALIZE CONSTRUCTION OF THE EMBANKMENT AND ANY INTERNAL BERMS IN 10 TO 12-INCH LIFTS AND COMPACT THE LIFTS WITH APPROPRIATE EQUIPMENT. 7. UPON COMPLETION OF THE EMBANKMENT GRADING, THE CONTRACTOR SHALL EXCAVATE[GRADE UNTILTHE APPROPRIATE ELEVATION AND DESIRED CONTOURS ARE ACHIEVED FOR THE BOTTOM AND SIDE SLOPES OFTHE ED POND. Es 8. CONTRACTOR SHALLTHEN CONSTRUCTTHE EMERGENCY SPILLWAY IN CUT OR STRUCTURALLY STABILIZED SOILS. 9. FINISH CONSTRUCTION OF ALL OUTLET STRUCTURES, INCLUDING DOWNSTREAM RIP -RAP APRO1\1 PROTECTION. 10. THE CONTRACTOR SHALL NEXT STABILIZE EXPOSED SOILS WITH TEMPORARY SEED MIXTURES APPROPRIATE FOR THE POND BUFFER. ALL AREAS ABOVE THE NORMAL POOL ELEVATION(S) SHALL BE PERMANENTLY STABILIZED BY HYDROSEEDING OR SEEDING 011ER STrRAW. 11. THE CONTRACTOR SHALL THEN INSTALL THE APPROPRIATE BASIN LANDSCAPING IN ACCORD)ANCE WITH THE APPROVED PLANS. - 530 XISTING - fj"GRADE y,--A - 5 2 5 ?OPOS -_D GRADE 1520 1 1 1 520 � = _ - > > w �tj _j I LLI W 00 Ld U_ 01 +50 I - I n I- wil I � I � il ,'I i . 111, ,. I - I NJ M 1 ,,, WK! � I I , 11 � WET POND CONSTRUCTION NOTES: FAC IILITY PLANTING SPECIFICATIONS-. 1. LANDSCAPING SELECTION AND INSTALLATION OF THE WET POND'S WETLAND SHELF (FOR LEVEL 2 FACILITIES) AND THE AQUATIC BENCH SHALL ADHERE TO THE REQUIREMENTS SET FORTH IN THE VA DEQ STORMWATER DESIGN SPECIFICATION NO. 13. THESE PLANTS SHALL BE ZONE I PLANTS AND TOLERANT TO BEING SUBMERGED. SOIL AMENDMENTS MAY BE REQUIRED FOR THE WETLANDS SHELF AND AQUATIC BENCH TO ENSURE HEALTHY GROWTH. 2. THE LANDSCAPING PLAN SHALL PROVIDE ELEMENTS THAT PROMOTE DIVERSE WILDLIFE AND WATERFOWL USE WITHIN THE STORMWATER WETLAND AND BUFFERS. 3. WOODY VEGETATION MAY NOT BE PLANTED OR ALLOWED TO GROW WITHIN 15 FEET OF THE TOE OF THE EMBANKMENT NOR WITHIN 25 FEET FROM THE PRINCIPAL SPILLWAY STRUCTURE. 4. A VEGETAT ED BUFFER SHOULD BE PROVIDED THAT EXTENDS AT LEAST 25 FEET OUTWARD FROM THE MAXIMUM WATER SURFACE ELEVATION OF THE WET POND. PERMANENT STRUCTURES (E.G., BUILDINGS) SHOULD NOT BF CONSTRUCTED WITHIN THE BUFFER AREA. EXISTING TREES SHIOULD BE PRESERVED IN THE BUFFER AREA DURING CONSTRUCTION. 5. THE SOILS IN THE STORMWATER BUFFER AREA ARE OFTEN SEVERELY COMPACTED DURING THE CONSTRUCTION PROCESS, TO ENSURE STABILITY. THE DENSITY OF THESE COMPACTED SOILS CAN BE So GREATTHAT IT EFFECTIVELY PREVENTS ROOT PENETRATION AND, THEREFORE, MAY LEAD TO PREMATURE MORTALITY OR LOSS OF VIGOR. AS A RULE OF THUMB, PLANTING HOLES SHOULD BE THREE TIMES DEEPER AND WIDER THAN THFE DIAMETER OF THE ROOT BALL FOR BALL -AND -BURLAP STOCK, AND 'FIVE TIMES DEEPER AND WIDER FOR CONTAINER -GROWN STOCK. 6. THE CONTRACTOR SHALL 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. FACILFTY CONSTRUCTION 1� A WET POND MAY SERVE AS A SEDIMENT BASIN DURING PROJECT CONSTRUCTION. IF THIS IS DONE, THE VOLUME SHALL BE BASED ON THE MORE STRINGENT SIZING RULE (EROSION AND SEDIMENT CONTROI REQUIREMENT VS. WATER QUALITY TREATMENT REQUIREMENT). INSTALLATION OF THE PERMANENT RISER SHOULD BE INITIATED DURING THE CONSTRUCTION PHASE, AND DESIGN ELEVATIONS SHOULD BE SET WITH FINAL CLEANOUT OF THE SEDIMENT BASIN AND CONVERSION TO THE POST -CONSTRUCTION WET POND IN MIND. THE BO TTOM ELEVATION OF THE WET POND SHOULD BE LOWER THAN THE BOTTOM ELEVATION OF THE TEMPORARY SEDIMENT BASIN. IN THIS CASE, THE SEDIMENT BASINS WERE CONSTRUCTED BEFORE THE CONCEPTUAL DEVELOPMENT OF ITS WATERSHED WAS KNOWN. AS A RESULT, THE PLANS PROPOSETO EXCAVATE SEDIMENT LADEN MATFRIAL AND IMPORT FILL. APPROPRIATE PROCEDURES SHOULD BE IMPLEMENTED's 0 PREVENT DISCHARGE OF TURBID WATERS WHEN THE BASIN IS BEING CONVERTED INTO A WET POND. 2. WET PONDS 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 SEDIMENTTRAP OR BASIN DURING THE F CONSTRUCTION PHASE, THE CONSTRUCTION NOTES SHOULD CLEARLY INDICATE THAT THE FACILITY WILL BE DE -WATERED, DREDGED AND RE -GRADED TO DESIGN DIMENSIONS AFTER THE ORIGINAL SITE CONSTRUCTION IS COMPLETE. 3. CONTRACTOR SHALL ASSEP11BLE CONSTRUCTION 1117ATERIALS ON -SITE, MAKING SURE THEY MEET DESIGN SPECIFICATIONS. CONTRACTOR SHALL ALSO PREPARE ANY STAGING AREAS NECESSARY. 4. CONTRACTOR SHALL CLEAR AND STRIP THE PROJECT AREA TO THE DESIRED SUB -GRADE. 5. CONTRACTOR SHALL INSTALL E&5 CONTROLS PRIOR TO CONSTRUCTION, INCLUDING TEMPORARY DF-WATERING DEVICES AND STORMWATER DIVERSION PRACTICES. ALL AREAS SURROUNDING THE POND THAT ARE GRADED OR DENUDED DURING CONSTRUCTION MUST BE PLANTED WITH TURF GRASS, NATIVE PLANTINGS, OR OTHER APPROVED METHODS OF SOIL STABILIZATION. 6. CONTRACTORSHALL EXCA VA TE THE CORE TRENCH AND INSTALL THE SPILL INA Y PIPE. IN THIS CASE, THE BARREL WAS ALREADY INSTALLED WITH THE ESC PHASE AND IT IS BEING UTILIZED DURING THE SWIM PHASE. 7. CONTRACTOR SHALL INSTALL THE RISER OR OUTFLOW STRUCTURE, AND ENSURE THE TOP INVERT OF THE OVERFLOW WEIR IS CONSTRUCTED LEVEL AT THE DESIGN ELEVATION. BECAUSE SFDIM ENT BASIN CONTROL STRUCTURES WERE BUILT PRIOR TO THE DETERMINATION OF THE UPLAND WATERSHED'S FUTURE USE, THE CONTROL STRUCTURES ARE PROPOSED TO BE MODIFIED WITH THIS PLAN. EFFORTS WERE MADE TO UTILIZE THE EXISTING INFRASTRUCTURE. r, .. CONTRACTOR SHALL CONSTRUCT THE EMBANKMENTANDANY INTERNAL BE :RMS IN 80- TO 12-INCH LIFTS, AND COMPACT THE LIFTS WITH APPROPRIATE EQUIPMENT. 9. EXCAVATIONAND GRADING BY THE CONTRACTOR SHALL BE COMPLETED UNTIL THE APPROPRIATE ELEVATION AND DESIRED CONTOURS ARE ACHIEVED FOR THE BOTTOM AND SIDE SLOPES OF THE POND. 10. THF' EMERGENCY SPILL WAY SHALL BE CONSTRUCTED IN CUT, OR STRUCTURALLY STABILIZED SOILS, Ii. INSTALLATION OF THE OUTLETPLPE S, INCLUDING DOWNSTREAM RIP -RAP APRON PROTECTION, SHALI NEXT BE PERFORMED IN THIS SEQUENCE. IN THIS CASE, THE EXISTING OUTLET PIPE AND RIPRAP ARE PROPOSED TO RE IAA A I N. 12� STABILIZED EXPOSED SOILS WITH TEMPORARY SEED MIXTURES APPROPRIA71-E FOR THE POND BUFFER SHALL BE INSTALLED. ALL AREAS ABOVE THE NORMAL POOL ELEVATION SHALL BE PERMANENTLY STABILIZED BY HYDROSEEDING OR SEEDING OVER STRAW. 1 13, THE CONTRACTOR SHALL PLANT THE POND BUFFER AREA, FOLLOWIING THE LANDSCAPING PLAN AND REQUIREMENTS. 14. DURING CONSTRUCTION, ADEQUATE MAINTENANCE ACCESS SHALL EXTEND TO THE FOREBAY, SAFETY BENCH, RISER, AND OUTLET STRUCTURES AND MUST HAVE SUFFICIENT AREATO ALLOW VEHICLES TO TURN AROUND. 15. THE RISER SHALL BE LOCATED WITHIN THE EMBANKMENT FOR MAINTFENANCE ACCESS, SAFETY AND AESTHETICS IF POSSIBLE. ACCESS TO THE RISER SHALL BE PROVIDED BY LOCKABLE MANHOLE COVERS AND MANHOLE STEPS WITHIN EASY REACH OF VALVES AND OTHER CONTROLS WHERE APPLICABLE. 16. ACCESS ROADS MUST (1) BE CONSTRUCTED OF LOAD -BEARING MATERIALS OR BE BUIL71 TO WITHSTAND THE EXPECTED FREQUENCY OF USE, (2) HAVE A MINIMUM WIDTH OF 10 FEET, AND (3) HAVE A PROFILE GRADE THAT DOES NOT EXCEED 15%. STEEPER GRADES ARE ALLOWABLE IF APPROPRIATE STABILIZATION TECHNIQUES ARE USED, SUCH AS A GRAVEL ROAD. 1 7. A MAINTENANCE RIGHT-OF-WAY OR SWM EASEMENT SHALL EXTENDTO THE STORMWATER POND FROM A PUBLIC OR PRIVATE ROAD OR ACCESS. 1 8 . THE BASIC MATERIAL SPECIFICATIONS FOR EARTHEN EMBANKMENTS, PRINCIPAL SPILLWAYS, VEGETATED EMERGENCY SPILLWAYS AND SEDIMENT FOREBAYS SHALL ADHERE TO APPENDICES A THROUGH D OF THE INTRODUCTION TO THE NEW VIRGINIA STORMWATER DESIGN SPECIFICATIONS ,AS POSTED IN THE VIRGINIA STORIVIVAIATER BMP CLEARINGHOUSE. 19, WHEN A STORMWATER POND IS LOCATED OVER HIGHLY PERMEABLE SOILS OR FRACT URED BEDROCK, A LINER SHALL BE INSTALLED TO SUSTAIN A PERMANENT POOL OF WATER. IF GEOTECHNICAL TESTS CONFIRM THE NEED FOR A LINER, ACCEPTABLE OPTIONS INCLUDE THE FOLLOWING: (1) A CLAY LINER FOLLOWING THE SPECIFICATIONS OUTLINED IN TABLE 14.4 BELOW; (2) A 30 MIL POLY -LINER; (3) BENTONITE; OR (4) USE OF CHEMICAL ADDITIVES. SUCH DESIGNS AND INSTALLATION REQUIREMENTS ARE TO BE PREFORMED BY A LICENSED GEOTECHNICAL ENGINEER AND ARE NOT PART OF THIS PLAN. 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CONTRACTOR REQUIREME, NTS - 1. THE CONTRACTOR SHALL BE RESPONSIBLE FOR LAYOUT OF ALL WORK COVERED UNDER THESE PLANS. 2. LANDSCAPE CONTRACTOR SHALL REFER TO THE STANDARDIZED LARDSCAPE SPECIFICATIONS FOR THE STATE OF VIRGINIA FOR ADDITIONAL INFORMATION. THE CONTRACTOR SHALL ABIDE BY ITS CONTENTS; HOWEVER ANY NOTES OR SPECIFICATIONS ON THE PLANS SHALL SUPERSEDE THOSE OUTLINED IN THE SPECIFICATIONS MANUAL (COPIES ARE AVAILABLE FOR A FEE FROM THE VIRGINIA CHAPTER OF THE AMERICAN SOCIETY OF LANDSCAPE ARCHITECTS, VIRGINIA NURSERYMEN'S A&SOCIATION, INC. AND THE VIRGINIA SOCIETY OF LANDSCAPE DESIGNERS). 3. ALL PLANT MATERIAL SHALL MEET THE MINIMUM SPECIFICATIONS AND STANDARDS DESCRIBED IN THE CURRENT ISSUE OF THE AMERICAN STANDARD FOR NURSERY STOCK, PUBLISHED BYTHE AMERICAN ASSOCIATION OF NURSERYMEN, 1250 STREET, NW, SUITE 500, WASHINGTON, DC 20005. 4. THE CONTRACTOR SHALLVERIFY ALL DIMENSIONS IN THE FIELD ANID NOTIFYTHE DESIGNER OF ANY VARIANCE FROM THE PLAN. 5. THE LANDSCAPE CONTRACTOR IS RESPONSIBLE FOR VERIFYING THEE LOCATION OF ANY ONSITE UTILITIES (CALL MISS UTILITY 1-0-00-552-7001 BEFORE ANY EXCAVATION). 6. REFER TO THE APPROVED FINAL SITE PLAINS FOR ANY DETAILED SITIE INFORMATION. 7. ALL WORK SHALL BE COORDINATED WITH OTHER PARTIES. 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 THE STOCK. CONTAINER GROWN PLANTS WILL BE TRANSPORTED IN THE CONTAINERS IN WHICH THEY HAVE BEEN GRIOWN. 9. ALL PLANT MATERIAL, UNLESS OTHERWISE SPECIFIED, SHALL BF UNIFORMLY BRANCHED AND HAVE A VIGOROUS ROOT SYSTEM. PLANT MATERIAL SHALL BE HEALTHY, VIGOROUS, AND FREE FROM DEFECTS, DECAY, DISEASES, INSECT PEST EGGS, AND ALL FORMS OF INFESTATION. AILL PLANT MATERIAL SHALL BE FRESH, FREE FROM TRANSPLANT SHOCK OR VISIBLE WILT. PLANTS DEEMED UNHEALTHY.WILL BE REJECTED. 10. ALL CONTAINER STOCK SHALL HAVE BEEN PROPAGATED IN A CONTAINER LONG ENOUGH FOR THE ROOT SYSTEM TO HAVE DEVELOPED SUFFICIENTLY TO HOLD ITS SOIL. CONTAINER STOCK WITH POORLY DEVELOPED ROOT SYSTEMS WILL NOT BE ACCEPTED. 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 AND PROTECTED FROM THE WIND AND SUN. PLANTS STORED ON SITE SHALL BE PROTECTED FROM ANY DRYING AT ALL IFIMES BY COVERING THE BALLS OR ROOTS WITH MOIST SAWDUST, WET BURLAP, WOOD CHIPS, SHREDDED BARK, PEAT MOSS, OR OTHER SIMILAR MULCHING MATERIAL. 12. THE OWNER RESERVIESTHE RIGHTTO SUBSTITUTE PLANT MATERIAkLTYPE, SIZE AND/OR QUANTITY. ANY SUBSTITUTIONS MUST BE APPROVED BYTHE DESIGNER. 13. MINOR FIELD ADJUSTMENTS MAY BE NECESSARY DUE TO SITE CONDITIONS (EX: FOOTBALL AND UTILITY CONFLICT). MAJOR ADJUSTMENTS MUST BE APPROVED BY THE DESIGNER. 14� NO PLANTING SHALL OCCUR WHEN THE SOIL IS FROZEN. 15. PLANT MATERIAL SHALL BE PLACED IN EXISTING SOIL WITH EACH PILANTING PIT EXCAVATED TO A SIZE SUFFICIENTTO CONTAIN THE ENTIRE ROOT BALL OR ROOT MASS, WITHOUT CRAMPING ROOT STOCK. 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. 1.7. THE CONTRACTOR IS RESPONSIBLE FOR REMOVAL AND DISPOSAL OF TRASH AND DEBRIS WITHIN THE LIMITS OF THE PLANTING ON A DAILY BASIS. 100. 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 MAINTENANCE: MAINTENANCE OF ED PONDS IS DRIVEN BY ANNUAL INSPECTIONS THAT EVALUATE THE CONDITION AND PERFORMANCE OF THE POND. DURING THESE INSPECTIONS THE FOLLOWING TASKS SHALL BE PERFORMED BY THE CONTRACTOR IN THE FIRST YEAR FOLLOWING INSTALLATION, A61D THE OINNERTHEREAFTER: 1 . MEASURE SEDIMENT ACCUMULATION LEVELS IN THE FOREBAY. 2. MONITOR THE GROWTH OF WETLANDS, TREES AND SHRUBS PLANTED, AS APPLICABLE. RECORD THE SPECIES AND THEIR APPROXIMATE COVERAGE, AND NOTE THE PRESENCE OF ANY INVASIVE PLANT SPECIES, AS APPLICABLE. 3. INSPECT THE CONDITION OF STORMWATER INLETS TO THE POND FOR MATERIAL DAMAGE, EROSION OR UNDERCUTTING. 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. 5. INSPECT POND OUTFALL CHANNEL FOR EROSION, UNDERCUTTING, RIP -RAP DISPLACEMENT, WOODY GROWTH, ETC. 6. INSPECT CONDITION OF PRINCIPAL SPILLWAY AND RISER FOR EVIDENCE OF SPALLING, JOINT FAILURE, LEAKAGE, CORROSION OR OTHER FAILURES. 7. INSPECT CONDITION OF ALL TRASH RACKS, REVERSE SLOPED PIPES OR FLASHBOARD RISERS FOR EVIDENCE OF CLOGGING, LEAKAGE, DEBRIS ACCUMULATION OR OTHER FAILURES. 8. INSPECT MAINTENANCE ACCESS TO ENSURE IT IS FREE OF WOODY VEGETATION, AND CHECK TO SEE WHETHER VALVES, MANHOLES AND LOCKS CAN BE OPENED AND OPERATED. 9. INSPECT INTERNAL AND EXTERNAL SIDE SLOP' ES OFTHE POND FOR EVIDENCE OF SPARSE VEGETATIVE COVER, EROSION, OR SLUMPING, AND MAKE NEEDED REPAIRS IMMEDIATELY. FACILITY 114SPECTION: MULTIPLE INSPECTIONS ARE CRITICALTO ENSURE THE BASIN(S) ARE PROPERLY CONSTRUCTED. BECAUSE THE TIMING OF THE MSTALLATI,OM IS DICTATED BY THE CONTRACTOR,THE CCANITRACTOR SHALL BE RESPONS11BLE FOR CONTACTING THE ENGINEER AND INSPECTOR PRIOR TO INSTALLATION. MULTIPLE SITE VISITS AND INSPECTIONS ARE REQUIRED TO BE SCHEDULED BY THE CONTRACTOR, WITH THE ENGINEER AND INSPECTOR, DURING THE FOLLOWING STAGES OF THE BASIN'S CONSTRUCTION PROCESS: 1 . PRE -CONSTRUCTION MEETING 2. INITIAL SITE PREPARATION (INCLUDING INSTALLATION OF PROJECT E&S CONTROLS) 3. EXCAVATION/GRADING (E.G., INTERIM/FINAL ELEVATIONS) 4. BASIN INSTALLATION (E.G., INTERIM AND FINAL ELEVATIONS) 5. INSTALLATION OF THE EMBANKMENT, THE RISER/PRIMARY SPILLWAY, AND THE OUTLET STRUCTURE(S). 6. PLANTING PHASE (WITH AN EXPERIENCED LANDSCAPE ARCHITECT PRESENT) 7. FINAL INSPECTION (DEVELOP A PUNCH LIST FOR FACILITY ACCEPTANCE) !!!!11P_jH - `� N1, 4'�\ , � `1'_ ,�) Ik ,lb f , I SCOTT F. ,�___ COLLINS'ZZ "_ No. 35791 11t, '110, I- OTITATL 1'�;;j w ��_ 0 r :5 z o A - T_ 11A ex U) L: � r �, :E: �-g wpm WW_ "- &n LU 0 :;-,, 0- X en =) M -A < M ;,2. LU 2: ,,,, U, 0 " �I 4A, �, �_) r � 2, - Z_ &n z U) ce -1 " 0 %&I- oip LU M Uj , > LH k2e A"j = M -4 M a --i I 1!:4 6 __ _�� - __4 co