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HomeMy WebLinkAboutWPO201500090 Plan - Stormwater Stormwater Management Plan 2016-03-31GENERAL NOTES OWNER SM CHARLOTTESVILLE LLC 11111 SUNSET HILLS RD, SUI TE 200 RESTON, VA 20190 TAX MAP # 093A5-00-00-00100 (LOTS 9-16) 093A5-K2--0B--00100 (LOT 1) AREA: 48.65 AC. AREA: 1.285 cc. ZONING: PRD ZONING: PAID 093A5-K2-OB-00700 (LOT 7) 093A5-K2--•0B-00800 (LOT 8) AREA: 0.783 ac. AREA: 0.873 ac. ZONING: PRD ZONING. • PRD ENGINEER: COLLINS ENGINEERING 200 GARRETT STREET, SUITE K CHARLOTTESVILLE, VA 22902 TELEPHONE: (434)987---1631 FAX. (434) 245-0300 CONTACT. SCOTT COLLINS, P.E. EMAIL: SCOTT@COLLINS-ENGINEERING. COM USE: SINGLE--FAMIL Y RESIDENTIAL SUBDIVISION STREETS: ROADSIDE DITCH TOPOGRAPHY JAMES H BELL JR, PC (USG S DATUM) DATE OF PHOTOGRAPHY - FEBRUAR Y 22, 1998 DATE OF COMPILATION -- MARCH 12, 1998 ROUDABUSH, GALE & ASSOCIATES AS -BOIL T CONDITIONS FROM GLENMORE PERIMETER ROAD AS -BUILD ROAD AND -UTILITY PLANS - CARROLL CREEK ROAD AND FARRINGDON ROAD PLANS DATED APRIL" At, 2008. TOPOGRAPHY VERIFIED WI TI-1 FIELD SURVEY ON JUL Y 7, 2014 BY ROUL)ABUSH, GALE & ASSOCIA TES. ..__ VEGEON.- ROLLING GRASS FIELD WITH EXISTING TREES .... .. ......■■■+■■ r■ r r r r r r T T T T T T T T T Y TY r7 y��Yi �✓`} SWM PLAN AMENDMENT PROPOSED CHANGES: CONSOLIDATED SWM FACILITIES #2 & #3 INTO ONE CENTRALIZED SWM FACILITY WITH LESS . GRADING IMPACTS AND MORE TREATMENT FOR A FUTURE- PHASE. General construction notes for Stormwater Management plans s.. 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. Fortemporary sediment traps or basins which are to be converted to permanent Stormwater management facilities; conversion is not to take place until the site is stabilized, and permission has been obtained from the County erosion control inspector. SCO SVILLE DISTRICT ALBEMARLE COUNTY, VIRGINIA .s 6- TMP 93A5•-1 SM CHARLOTTESVILLE LLC i 48,65 ac, DB 4613 PG.392 LOT 1 --_ S9-6 (APPROVED FOR f CONSTRUCTION) \ ® EXISTING SUBDIVIDED LOTS 7 & 8 APPROVED FOR CONSTRUCTION 19 196 SECT. K213 19tP DB 4237 PG 322-328 (PLAT) I � j TMP 94-15A3 EXISTING RICHARD E. OR - SUBDIVIDED LOT 1 STACY A. AUSTIN APPROVED FOR 21.20 ac, S — \ CONSTRUCTION / DB 4562, PG. 187 A SHEET LAYOUT SCALE: 1" = 200' TMP 93A5-i 2-OA 5 — GREGORY, LARRY F OR DOROTHY S 4.01 ac. LOT 16 DS 4294 PG 740 LOT 15 LOT 14 LOT 13 LOT 12 LOT 11 1 1 1` 1 ` LOT 10 j TNIP 93A 1<2-OA-3 SANS VICH DEVELOP ENT LLC 4.1 ac. TMP 3A5-K2-OA-3 S NSOVICH DEVE OPMENT LLC .02 ac. TMP 3A5-K2-OA-2 S NSOVICH LOT 9 \DEV LOPMENT LLC 3.75 ac. --- / TMP 93A5-K2-0 -1 NISLEY, ROGER OR SALLY 4.00 ac. \ \ DB 4616, PG, 520 \ / TMP 93A6-K2-0A-13 EQUITY TRUST CO AS CUSTODIAN FBO SCOTT ANSOVICH IRA & LESLIE SANSOVICH IR j \ 21.00 ac. DB 4294 PG 744 CURRENT OWNER/DEVELOPER SM CHARLOTTESVILLE LLC 11111 SUNSET HILLS ROAD, SUITE 200 RESTON, VA 20190 ENGINEER COLLINS ENGINEERING APPROVED 200 GARRETT STREET, SUITE K b°the Albemarle County Community qeve,, pmentoepanmeni CHARLOTTESVILLE, VA 22902 °�'e N v�7 J-v 434n293s3719 8 VICINITY MAP SCALE: 1" = 2000' ^^ SHEET INDEX Sheet Number Sheet Title 1 (AMENDED) COVER —�— �uic -r��ir rnnini-rinnic -3- --- --- 4- 7 (AMENDED) STORMWATER MANAGEMENT PLAN 8 (AMENDED) STORMWATER MANAGEMENT DETAILS & CALCULATIONS 9 (AMENDED) STORMWATER MANAGEMENT NOTES & DETAILS NOTE: .. .. RPT • O.. THE OWGINALLY ••• • S •• PLAN FOR LOTS1-16 (SHEETS • 16) i L h t LL'GE11 D ROADS =-1 EXISTING CUL VER T CUL VER T A DROP INLET & STRUCTURE NO. CURB CURB & GUTTER PROPOSED PA VEMEN T - —� EC-3A DI TCH s» DEP77-I OF EC-JA DITCH EC-2 DITCH 6" DEPTH OF EC-2 DITCH EARTH DITCH DRI VEWA Y CUL VER T Y BENCH MARK CLEARING LIMI TS - VDOT STANDARD STOP SIGN --------200-------- EXISTING CONTOUR 200 PROPOSED CON TOUR 240.55 PROPOSED SPOT ELEVA 77ON TBC DENOTES TOP/BACK OF CURB T/B DENOTES TOP OF BOX T o SCOTT R. COLLINSZ Q H Q No. 35791 3z1) 1P TONAL w Ld Z 0 Ln N N N Uj Z Q 0 Q ►�►-� V Z W V1a a o Z Z V o Z o H W a H w V) U > 51- UA Uj d 7% � ri N �� O o Z g o 'Q Z W W Z J O U O 4► V C O U W +' L .3 0 � � cG Q. 0 0 W U � a g 0 E O 0 0 0 a 0 V to O V Ln W c� �w o Q � 0 C a Z 0 U L Q W o r, C L. a U. a C c C s C C C y c �c s Lr) Lid C > 0 ( l ` 0 V a a s h.. C cc �'c z N c C Cr LL LL Zz 2 oLL F_ C Uc Uj L a C c L c a U z y a 0 s a L C U Z LLJ b ao(D � a c=n r C JOB NO. 102054 { SCALE AS NOTED __­ r SHEET NO. a j u a S � - ____ - I . I / I -,, . ---", - -,.-..-. 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I -_ ... ... _ .1 \ I I � '1__1 ____ - "I �. .. .. , , .. 1, I , ) PRO _ FACILIT-Y-, "T / I., - \A� I - ..''. z .. U/ru ,;-,., 1. \ � i � 'XI I. ... � \ \ /, " \ \\-, N I � .-- , ­1­ E/16C E ENT i (/)I //, � // / 1 / // � Proposed Lots (9) 54,000 sf 0 1 , X I - . I / 2_/1.---1__._ .'', , .. \ \\ .. \ // ) I... .. 1. ...., . NN \\ ,�f _ li� X, I i /1� _� . . - ... ___L� �--_.��, I. ..'I.'. *. .. ,,,.,. ., ..". �� \ I" % I 1...�1.1.,,.'-1. . '', ' 1�1 "\ --- A F,--THj_S-SE_T__OF---PLANS. _/ ) / , / 1 Existing Roadway 21,450 sf 1.1.1 I \ N.A." ____ - ;Ix" I - - _. -, . .. � \ _�El) SWM 11 . :" ___ __ \ill . . � / 'jo ."'. - /­_.� / , ,� . / , I � __ I , ,,, -- � / / - ___ . '.11."".. , 1/11 I­iUT / / --Izl-_ ­ � - ­ - ' I , "' , I - ,, , ___� ______ �� �_ ­', . . 0 . .... '­ , \ \ \ - 1 66,000 sf ... _. �\ � �� 1;1.11"'' \ .. - __ . - "I - -, -,_,.'. , . '\ -1-`­ - -_ -_ -1--, Future Lots (11) -_ \ V.....'......i.", ...:,, -, -.-....--.-.,.-,-.. - " .. -.'...�,.,- .. " .- ___� � \ \ \ ), - I \ , . .. .,.,, .. " - - -1 .. _.�, 1.��4�X \'% '11, I 'I-, 1-1 � __� ,-- --- __� ,�--, / / -_-1. . ..�.� , -.1..,/._ I � . I \ -11 , �, - — / -,-- ------ .�,,� . .. ____��__� .... , ­­ * I % ­ - \ � � if 5 �A # / \ 1� I " - _. .. -1 I N. - \ 1-1 1� _ . \, \ ____ � .*.-. , �., ...1'..."... -ii,, . . N . / %'l .. . �` 1� I // "_%i: ... ..., O'� - / _j_/ ,;,I - I L Am . X " AIA / NT�RIM ..,. N -.111 . V Ic \ \\ ,� S'�- 1 � � -,.. � , .. .,. 116RN� Dou;�) _W1 � .... �__ ____ - k-,, , � - "I a t . I , 1. 3 � ac. / (UT RAIjNAGE / ".�'- " - ` , - .`�--, � _. --------- ____ - " * 1. � V� " L� \ \/'A� \\ 11� X..." " , " -'. ..,.,.�w RIKAI,i, B LD -_ ____ -- - ,/ . - 1� 111�11:lww N \ � I , \ a IN j* - . . . ,,,� / ( CN 35.i ... 1. " __� - . - I / 1 172,400 sf -­, \1 \ '\ ��, V ..�. - ". , . , 1-1 - .1 -_ I , � / . _1 --a \ % . , � LOT 59 DIVIDE � v v'� / /' ____�:_ I �� -*---- . I ,.,. . , � ,� - .T .. . . , � �, \ X z .___� I / Future Roadway 30,950 sf 0 I __- 1 - -�P, --,-Z- ,. " '. I / / , D _�j i j z= .. . , N\"k , i� \ \ \ _,_ -,,-,- ---- �'� � � � � \, �\2\\"� ,�, "\ ( ( , ­ "",* \ , _j - - . SHEET,f firs � �, ., __ �; \ , \,\ I—, 'I, ..........Z.,.."...."..%, . " // 111",� . = , , /.. F WY , _I------ ____ I---- - ­_ / \"�:..� , \ = � 1�\ \ ,__� `i, - -1 �\ v� \ $ � 04 � \ ,* " I I i , , - � \ V � \, , - . . 11 " _." 'Nl.ff�-, ____ .- . \.-, & - - ------' _- _____�- ::�_��_ I / I , \ _,� - � I _\ , \\,' " . ,..,.. \ ii o h sp __ I , < . \ ... . .. _ '­­"��-*_ N-1 I - I—, , ,� - � \\ \ .. _,�\ \ \ \ ,\ , -, K N I ,� . - _ i hrs Sass 1%� '. C I .---- - � , , I � -1 . - SHEET­F1:OWj - \ I IN 11 � \ -, *, ., ,'.'. .. (R 55 'j " � 5W \CON - --- I --, 11 ""' _c= o.i5hp. 11117 � \ ; , .", . .. Z's � so 7 0A .0 \ '. 1. - \ .�0\03h a / / /,J.�, /_­` V__1_ _.- __� . � _� __ __ - �� ,.-- CON- C \/ \1 - " U 7 \ _.� - _�' -, ---:-- `�_ - "_ -5D .(Z.6i` 14� N �- \. I` _ _,_-��', � ___ '__1j , I I I / I I � � / ", -� - - ',_­�� , - 1�, \ - � � . , tko - ____� I . OW,Tc=�, ihrs.\ \\ 1, I \ � ��,�, � \ FU T ,U� __--- I -,. = __. I \ / \ ( \ 1�ft '--,\ ra "'" aw'�. . \ , - , 0 "; , \ ,-�`.,. � 11 /11, , � ______ __ - .- i / �_ I , ". " % - r - j - - - - Ti_ -c = - q_'i - � �'h�. \ . \ -11 r��_ / I----- ___� ____ - ___ \* \ () \ L ��_ _j -+fNAL � 1, ,va\W on I T LOT 62/ WH � �tS �A� �q 1-11 --- --- ( '�, ___�:z �_�: \ �, \� �� \ I . \ \ N - _� - -If I , / _,_� - - ), \ I,- \ \ , \ ..." UNA 4F A11L _� - ­­__11 I / / V, '' I \ . , ),-I I I I I _____ ---' ..... , 1\ j \ N \ -, \ . \ i... \ � ___� - -, \ ---" I V, , \� \, \ '�,60 .. / / X ,,--/ / _, -"--,, - \ \ I-,- ,E z4-H0UK5CS QALCUtATI01,._ , \ � CNAMINIk Q3.11j\ �\, \ ' \ �,�\, \L6T " -1, / SE - , / � - \\\ \ V �, / V. 11 1'�'_ I-' \ C= 10 \ \ \ \� Fd\T ,--, ---- .. 1. �, "\ ___�_ - \j 1, � - � I \ _-,- FOR­AD_._q1Tt0NA,L �7A\IL� ' 1-1 *.., ., 0 \ FU , \ \-, \ � Z",- ,,--" � / / (. 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F 1____1 � \ -4- - " * .'... - - __ � '11, I ---.< _____ � U) ___�­ \N% I 'i '�, \ - � \ I ET = 9,27111's. // - I--,' ____ -------- / / / / IT- I � __- _'_. _�, \ ,-,\ , \ `-, �___._ -I-- I-- . . -- d0k�F 10�0'hfs__ / __� I---- ______ ­ ____ / - .- _. - __ - ,_ ___ \ . __ `�_," ____�_ 11 ___ __ _,_< \� \ \ \ � ,,, - ,__ I 1".'' '__ ---I- --_ '___ ___ I---- ---- ___�- ____1 . \ 1\ '\ ` I 1\ "' � , r4l. _\____� " 77-7 S �_ _.- "--- --,, � \ \ \ \ \ `1 * *�f IV) �' I \_ \-, --,, -,- --: � , �77 ----- _�, . /// ZZ z- I-,,--,' ___ _.- I- , '11) � � - 1, - \ 1XI I _��_ -� � ,_ -1 1,,_1 , $ / � ,--- / z � 1-1 -'-- . ", - . -----. - , �. _ %, ,�,, \ \ , , 11e__ �____� _­ �, __ \ '� I \ N FI JAL T rs ' I '11� 1__� __ _­ - , - ", -'. 1. I 11iii _,_�_ \ ".. __ _� �1� ,�� , , ..... . - , -,,�, \ ____i I -_ AA \ \ 66,91 .,......, _ 'CAL - I . _.::�: . . �__ � �\ \ I . I � \ `�� �, - . \ \ \ I \ \___� .... _ - LS, / - , Lli ......... �11 - E :14 I--- . I \ �\ "\ 11 \� _j I - - _, _-, __ � - -_ --- \ 0 / z - ���­.`,. I .., 11.1 - \ 1. I -� -_ - I -, \�, , , -, ,-- "\ 's WITLON IDEfAILS ,.,.%. *.,.i­. � ­ . �� _ER MANAGEMENT NOTES: I __ " "� __11 1',.-� __ ---- - -� _� _ii"iii\ � /Z Z .. _-__ - --- STORM;WAT __�� - �A ; \ 11 0 t-% - I - I A- � <� . I \ 40 \ - _�: � — = I ./ � ,--,- ­--� ----, "--- � ` �2_�' 1. I ______ 3.. THIS PLAN PROVIDES STORMWATER QUALITY& QUANTITY TREATM ENT FOR GLENMORE K2B '\\ I '. \ 1-11 . I , _____ .- - . -_ I to - '1­1' ',...,.1'--,'.,`i--.-.-_"­ -_ I _�_ . I . us ____ -,--- a - ....... 1­ _." - ill �1_ I- ­ __1 _', � � . ---:, 5 ..... / --- � 11 .."10'.. � ____�__ � iii- LOTS 7-i6. THIS PLAN ALSO PROVIDES A TREATMENT CREDIT, BOTH QUALITY & QUAN , �� _,_", .�/ / ,/ / / - . _.... ­."­.`i�-_,.- \ _____h V-1111, , I N ;10' - - __ - __ � -_ - \) _�, . � � I ,� \ T� / \ �� / i -'-fI ...''i., � __ '__ ___ ,:�� _.."..� . ___ __ ." --ii­ -�,� �, - - , - _� �_11,1._. 11P ____� --.ZW- . ". ���__ _: - �__ - ___ U) 'Ty � - - :�ii�, ,\� \ , - / ___ '­ " �;� " ­ - FOR THE OUTLINED FUTURE DEVELOPMENT OF CONCEPTUALLY SHOWN LoTS 52-62 E�THiIR if- I v., - . . , ;0- � , . .; . ........... : .... ��:� �, ( , . - -- . . ,___,� ,---- ,--- Z / / / . ............. .�', , - ____ ( I - __ �." - RESPECTIVE ROADWAYS. THE TREATMENT OF THESE FUTURE AREAS CAN BE ACCOMPLISHED ,)I',-'-- "I ___, /' .;��-Iw ? � a / ----- ..--.-,- - ".." . *"* 14"111 001M., ���� - ; .,-- Z 1�� ,,,- / j t � �� ._-,.;, �� � " I � i 0 kl�ll \ z / _,� k 7C 1 __,s I---' __,_;_ fi,_ WITH MINIMAL ROAD/LOT GRADING AND THE USE OF DITCHES & CULVERTS. / X ----__ , \ Z ,,,-- � .,..,� ..... �W..!,�-Ti�'.,-1111­1_- ­___ -----:--:--' ­, --- -­` . . . . . . . . . . . . . . . . . . . .V _____ _� __---j - I I �.� _____ , — . _; - --- ,?,I '�_, F_ 2. THE TREATMENT CAPACITY FOR THIS SWM FACILITY GREATLY EXCEEDS THE MINIMUM , .. \ -, ,// Z " __­� _____� ____ ____ ____� __::�_ - I I/ / , / \ I ..... I , , \ - I ____ _-, , _�� '1� / a, 7 W .- .....­ - N � ... Uj - (-A. �� --- �_�___ REQUIREMENTS FOR THE DEVELOPMENT OF LOTS 7--a.6, FUTURE LOTS 52-6:L &THEIR / /\\ . ) __1 I - _________1 ZIA ,/ 1 �9 a i \', 1.6 '%--.*.*. " -, \ .-i" -____ _-, ---�_ - I--- / '.11 ...".. 1__,____,__Z�,_�­` - __ _____ __ - ,X """ ,_� ,z � . � / / ,\ "' '' 0 - RESPECTIVE ROADS. AN ADDITIONAL WATER QUALITY CREDIT OF 2.3 lbsiyr IS ACHIEVED WITH , .I- ", ____ I ---- ______,41� 1 1 � __ '1--, _0_t1A .- -AI ,,,-,- 7- . I an ­­V. 210W'e*.,-�t� . - ,-- ,�- ____ \1 - --- "' ? __1 THE LEVEL 2 RETENTION BASIN AND THIS CREDIT MAY BE APPLIED TO THE FUTURE 62 LOT IX . .-T..... \ I---- ." 9 tii� - --,--. 1� "�� , . I _T_ *" . ", -'. ,K111-1.WR_-,` _,_ ____� ___ __ ____�... I— I I_ __. _Vij , .. - -, I--.- . ____ - _1____7 ___ . ... 0 -- I---- --,,, - ." - - a 1� 1�\ � , --",, - 1.11--l" ..'.. ,". - / IV / late "i .,,-,' 8/ ,� - DEVELOPMENT AT THE TIME OF ITS VSMP REVIEW. PLEASE SEE THE VRRM CALCULATIONS. . � -..-. ___� 1_1�,6. I--- I ___ - -I- , \ .- z I-- __ I ,/ / ��, I � I . � . I __ _____ 1\ _. - ! A , _____ -,--- �_ ____ -k— -.,..-, --_-_ ______1 \ 1, --- -----' , 7 - ,_i_ '.. ­;� �',_�, __ I \_1 -1 __ < �Wl- ___, ,,- " / THE � ,-.,I-.---: - 1P. �,, I " __" __­ I \ -W- �� �. � - 0 ____ ______� 3. AN EROSION & SEDIMENT CONTROL PLAN ASSOCIATED WITH THE DEVELOPMENT OF I--' - ,�, __r _____ 9 t_1 - ___� '\, ,-' __", . ,-"i ___57- � FUTURE 62 LOT GLENMORE K2C SUBDIVISION MUST BE APPROVED PRIOR TOTHE __ -, ,--`9,,, ,--- V -., 9 t--4� -� c ---i I .. - 0 __ .-W - .. , KIWI- S-CF - - ., ,Wm- 't __�� / TV _Z tMl, ,,,-.�-. I ----��__--� "__­�' __"D __� - - , -."-'�, . . . . - -1 - r ____ ,­ __ ---.- '---.- ____ ­ __ _,�_ - ,---- ____- -_ - . .­ ,.',�� _�� _____� - ___�___ CONSTRUCTION OF FUTURE LOTS 52-62. . __� �� ---f 0. - \\ , I -.,� V .,� - __r ---- CP . .. \ ----- ,-- I-- - 1� 1, 1_'1_11 .-.____1_;"�V__ -.�..�-.-t-g _-.'"' -, _ _ � 0 ----- ___ f; V_� . ,4'_1,.", Xj .L .j.�.P­.ffT-A,;,.'% 4. .' . . ..... -_ . �_ It-___ ---I _____------P, --, 370 4 ,.�'.'-,�.�-.-t;-,-.--,-.----��",..., :_- �,_�__ I __ --- -------'\ � 0 pr .. TeN N ..., , _i- I----- I - ,­ \_1_ --- � ___­" - - - . .. ., . -- � _ .., . .._ / Watershed Summary . .. .. , .,,,,--, "---" 1__�' - I �,\\Nl ___9�t_l , ` I"..., .. .. � ." k ". "', I .!,_ - I � / _1A --,, ---.------ - C:� - I'll � -'..."i't", . � C\1 �_� - _: Roc I- !A- �� 1-1 1:1i_0_� I . ,.-. 1. 3' _­" - __/ - \ �'-..*..... � ____1 - . - 5..., �-.. .,.'-,.., -.77-1 -1"" 6) -1-­` -----,, ___` __� I,-.'.. _� V, , ­_ -4 �,� I ....... -M ... , / / - " 1."..... . , .. ... � __ . -44-0 -12,___-- 1'.., -i-.'-.'.. .........." ....... .". _', ­� - ... *. . - .-M......w. ....1 .0.1 -Development I __ \ -,--..i-,',.­.'-.`-%,.... .. ....... . - I., .. Pre ,,, -,--- ,---� ---", ,,-- M* _4 �, V\� . � "'."'..� ca.... .. I .....010 111M... " / '-, � \ \ __� - H " __ � ........ I Time of 1-yr. Flow, 2-yr. Flow, Area, ac. CN Conc., hrs. CfS Cfs Subarea A 3.08 79.0 0.27 5.27 5.80 Subarea B 8.54 1 78.2 0.32 1 13.12 1 14.46 ­� . -�, ___ I . � , -.--W____ .._ __ .- _�_ - .'.. "I"." ___ _11-1 , �� — ____ , \" --, I ... I ` I ... I - �, I I - __.. <_ , 5� �1� ..., ., - . . __,_ _ I __-- I ___ 1___' 1'..'..'i" I- --- - -_ I.. � ..., I -Rly _�. : .. ,.j-..-­ - I / / \ ___ .--�" ___ --, ,v 1,�Y- . . �_:;�- - _­�l - _____ __ . \ -_ .". ,-- .1 __� ­­ ___ __ - _�_ '_ , I 1__� ____ ,,,---. � A . ___ � < r I - . _:_ __ "�, � � � . - - -Ij I I , 7E -_ ) ­ `1� \" .. ..., , __� 'I-, "\ \ \ / ,,�,j ) -- ­_ '.. �__� --- -_ -,.-- I N ---IiO-� 3 ac. "`_I� ..;'.., :.:,, I - -----, ­ - ___­1 - . , 134 E -,-"-- -1 .__� -_ ­,__,�, �, __ I �� "\ _�, -'. __ _� 11-4, _____1 -11 . f__ .. �_, 1__� I .. .. ____ -1 \ , 1� — � CN= 82.9 .�.. ­;", . r '� � 1,1:� ___ � � � ____ . --..,.-;-­ , I- ______ I----- -----_ --I--- " — � - .,'..*. .., ,. .," I--- —) , .--,---,. ___­` � /,, _j \ ..'.. ,.:,., - __--- N1_ � ._� (__� �\ .­....� I - Tc= o.��hrs-, I _____ \1, L_ ... , 11 - 1-<_ __ " -1, � ��&_/ -,, � ____ — ---__� __ - ��11 . tt--V. .1 -.-- __ _�_ � - I __ A ,-----' 11 ", . ____ 1-_,i ",�� . S_,�;,.. -\ '1� \ _ .", -1 - , -l"', '.. i,., --- "- /--,/' - _____ \ - _-I- X� . . �..'.-, ., 1,,, 11 I \ I I ,--,,- ----, ----,- � \ \ ( '__ 11, �,____ - - r r i i T "I I .." � � I'll I,- � �_ --- . _ _,_ 1'�, �H E- U - Li .. ........ ... . I.- �� _�_ ll .,... ­ ­-­-"� - 1 ;.., . I I--- - - ­__ _----- 1__' __----_ ____ i 1�1___ -,,- _1 ­_ __� . __ .... ....,� �,_�, - n_­"� \ ­­i- ___� --- - *.1. I -/--,, t \I-- - '1� �� I., 1�i.. __ ! � -----\ - .. Post- Dev elopm ent __ ""_� � \ F �_�,_ ..i. ..'... .1 ��� ...._ - . - __� - I - _�� ,,,,, z - . \ \ � � � � __ . _. -__ ____ .'--, - .,-. �,.--'-' . ..."., I . . ____1 ".. IZ \ � k 80--,", n ­' 40 acr�� / ,,- - I Time of 1-yr. Flow, 2-yr. Flow, ' Area, ac. CN Conc., hrs. Cfs Cf s Subarea A 0.79 83.9 0.16 2.03 2.27 Subarea B, Interim 10.83 82.9 0.30 0.90 1.07 Subarea B, Final Buildout 1 13.97 1 85.1 1 0.21 1 2.23 1 4.41 I � .. � . . -- - Lt - - I , . --- I ............ I.,"...'_- - - -_ --- -1 �, I - I /-- " I -, . ­�'. - "... '. . ... ­ I ­1� --_____ - —,:. - , \ M � . -_--_, ----,. -, I . 'i,-. - I..".I... . -I.. . S10 ---- � I ) ) \ 1-1 � ,--, I ,�7-1 -,-- , — _�,,i I., � -_ - _­., . . . .... oli- . I—.", �..­...-...'.: -1 . ................ ­ ____ ____� " I \ / __�_ I � - .. '�*­*'­' "' . 9"' - — , ) � � / ­-, �_ __ '�,\ , \ �\� � � FI.- -...----- . . . . . . . . ­ '..­­;­­' I. I i.- ..... -0- ____ - 0 � � —_ AN.A.',1111Y. I 1-1/ -1, I - — 1::� _ .. 1­­.., __ ­- ____ I- ""I- I -"-\ � , . , --,. -- -�-� ------ / ­'_ _ --I-"-- ___ . ___ \ --- — ___� __ I � � — ��, , . - ---.;:, -- "_� _____ ____� --- .---" ) � ) \ � I _� I �1� I---- _tN F EET ) ,/ -1 I __L_�� - __ __ ,__--- — - �� / -*\ "" --� ---\ , � � � - __ /' _____ — - ______ __ �_,__ - __---- —) I � \ )r ' � . X ,,-' __ I inch-= _-8-a ft. '__1 __ � \ � . ____ -, /_­� .1" ) -I',---- ___ / ) I, � � ::�- - ( / \ � ; - — --- — — :��': ---.-- // _�'.'%, '�, '\ I \ � � I \ %I tl� \ \ ,\ " I \ -1 ___ , / ( (--"/ - / -, .,-*' ____ _� _____ I I /'11 I / / / I I 11 \( lk \ \ \ I � i� __ L \ - __ — - — ,� \ 11, ,---" - __�� I/ ./ / � <_ :5 0 L Li 2 � L C :� - � ( 4 , , F� z Uj 2: 0 z Uj X. < 5M 3: ;7 V) -� kD 0. T-mq �- 1 �7 r**s Lu 37 C6 Lij (D T--i < z V) < F� 5- 0 Ce. .j Uj �_ I < Co 3: r*4 5- Q� �Sme 0 III— Z V) 0 10MOMIll F_ U uni - V) Uj cy'. 0 X z t Uj LU .J r', r1l 0 (D = 0- I Ln - JOB NO. 102054 _ SCALE 1 11 = 80' . SHEET NO. 7 1 LEVEL 2 RETENTION BASIN DESIGN & REQUIREMENTS: Treatment Volume (Per VRRM Calculations), Interim Stage Minimum Design Treatment Volume, Interim Stage Treatment Volume (PerVRRM Calculations), Final Buildout Minimum Design Treatment Volume, Final Buildout Minimum Treatment Volume Required in Forebay (15% of Tv) Provided Treatment Volume in Forebay Treatment Volume Provided at Wet Pond ivIWSE Minimum Percentage of Tv Provided at MWSE Percentage of Tv Provided at MWSE Ponding Depth Corresponding to Minimum -Tv Maximum Ponding Depth allowed for Minimum Tv Maximum Percentage of Tv Provided above IVIWSE Percentage of Tv Provided above MWSE Minimum Percentage of Upper Wetland Shelf Area Required Percentage of Upper Wetla nd Shelf Area Provided 12,978 cf 19,467 c:f 21,990 c:f 32,985 c:f 4,948 c;f 4,949 c:f 3.7,346 cif 50 % 113 1% 0.00 ft 4 ft 50 '% 0 'yo 10 (r 10 !% S.TORMWATER MANAGEMENT FACILITY GRADING Elevation (ft) Area of Forebay Cell Contours (sf) Volume (cf) 328 67 0 330 415 432 332 1,080 1,875 333 1,543 3,180 334 2,005 4,949 336 338 - - _ 340 - - Elevation (ft) Area of Main Cell Contours (sf) Volume (cf) 328 2,894 0 330 4,142 6,999 332 5,644 16,746 333 6,404 22,766 334 10,170 30,981 336 - - 338 - - _ 340 - - Elevation (ft) Area of Wetland Cell Contours (sf) Volume (cf) 328 - - 330 - - 332 - - 333 702 0 334 1,375 1,020 336 - - 338 - - 340 - - Elevation (ft) Net Facility Area Contours, (sf) Volume (cf) 328 2,961 0 330 4,557 7,461 332 6,724 18,672 333 8,649 26,338 334 13,550 37,346 336 19,300 70,027 338 25,190 114,387 340 31,484 1 170,944 VA QEQ.$-TQRWAT�k SPECIFICATIC4 Re mv rans ., R 4 arse . perAw R�I�y ` ��•aa zone, CONTRACTOR SHALL 545 INSTALL EMBANKM ACCORDANCE w DETAIL ON THIS THE WET PO CONSTRUCTION N ON SHEET 9 & EMBANKMENT DET SHEET 9, PROPOSED 030 RCP BARR 72LFi INVERT IN INVERT OUT= PROP VDOT S1 PROPOSED VDOT #3 ( AGGREGATE OUTLET PRC w/ (GEOTE) TILE FILTER UNDERLAYMENT (L=16', ' W2=23.5', D=2' MIS : tffI ls� bid , � 4 f' 11' .�'ttllEii(�I� filet' a 1/;a" ai;;as. pir-,led. b0uk �� i2.Cla�:'rx�ci •.srCLf., 1�':�' F'fl�rw�aier- CIO NNN}}}lll"""ddf I s�mict:i"jo H14'i clruc-lart l plugtic vAth 000 t ahown with uPtkua:hl Pis€, 1��e ;<i:d'ti4t,lS'�i.l jylrc,�ir tvji:3l • %��.. 17!�t$,i i'It161 }i jJa � 'f,3f1/�3 :u�tsGlur�a: tt��'lu�Fis PLAS:T � ,[.: �' ,�:.a . R iS �.� >t CT ;,! -1�,ti irn_ a =. 'sc 4 4 i Stormllkw ROUND SERIES TRASH RACK OONCME MANHOLE STANDARD W INCH RACK 9HOVMi DIME"10NIS IN INCHES tW?fs�Fsit3€;ltl P.L.FLA6ri1G6Y k`1..�`tTfGG UFII� i3, ItLf� ul��KJIMB� rF�a aME�� 510E VIEW ISOMETRIC StormRax'M Round Series for Concrete Manhole Part No. tin A Dim R Iki C MIn I) Min -Go RSA 24 .17 1.4 A 9 24 30 PS-16 21 4 14 .h 40,4 36 43 27 Y 18 54 48 57 RS 50 - 27 % 18 651A 6o 70 Plastic ll-uttonsp Inc. MSTOWR M Mam 1W, %YID, girl. .3 a 11827) 871-5727 m PROX-CT: - (W) 722.2219 Fu stt�ri��v�n+r3nr.�aLasticr�h�tior�cu� CQE"RUE STR=URE DI1M4ENaONSt INSIDE STRUCTUkE DIMENSION OUTSIDE STRUCTURE DIMENSION _AVAILARLE40F CRC BRACING FOR OVERHANG HOPE ANTI -VORTEX. FLATS DATE_ M a= DE'rAL: fr? T ill> E tGI � 1 1 71T1 }N - . 94 WE P0N ": TI 4. ` 'IC_AL DETAIL.t t�1�=Ault;? �'� ► ... -.. �`;!F'L�l!%� F"Rr��.t �#"7�F,4",( . . MAY�-'lUEi'M 1?': f tril B ! 1Fii M TO 7,a.Bi E 14.2 i VQ IFti_FEFiVJAB 1EInLI1F.E}411 1 � 2 F��i•1'',�1l.#Ri�• hF�.l ..T,;-•�-_,,.' :...,,,..:,,_ ��f�FJ''f HF.�1� I-i ST �•:4 iJEFI •. � 4 �^••.. S• r-^.tee-"�. ..�'•'�•f4 .•'cI -9.L •l seas-� jF-L�� LAranr FLi1�' PrxTrI ktiL�? OLE1ET€�'f (Fi�FERnGIT L i6 a {€iFE RTOTA'al 14.:? F�ttA L� �1fv�t r:(s� AM EtWH L,2 =i6Uif1EM twT7 7: ErfAE�a,+•.�1rPJ%�hY�'�;, 4Tw�PEfi-i' fs�-{�1�;1-1: . ... PLAtVV)E�7 - tfr iE FIE! EFt:�, TA131 1,� ? �t DQR9!QN4 .,gr Ei '3> t F� ` WE TANG •G � iE41E AiC2i3r taFF Lf gt 1ligfd2 tAi'i�VE FLJSD aE' L C.. . pox AQ t'1ORrAa1_ fL rF--•�f� , ! t.�• ► .� � I� Sri ,����-�i ��i� lei �; . -- --.�� �� ;�i�r - r� '. .cat- F��sr>t "Tt;I.tz�`FEFt ��iE1,F. tr�FTz�vc� :. # I��# .. �� • " II° I~ --iT ir.s.. � ..._ � 1"i'c--l•r�.-T�t.: -€� 1PE " . S IlI 1, Pt FILM (011 OP#'EI �h1ELF s�f�LA��Dt .acat.�DT�: r��n -• ' AAL Fti � s, Hrarl TO : -brgb. i1 1= IJI`=s ~I II---- , -�L # 1177 f11#I� I j- ,-viz _iri� rr r ii.1l=i,l, I* il.l (k► 1l l EII Ili, i-„^I "srVG r ��, rya M 1 `•r✓;P NOTE 0 TOBN5 D 'OFh 6 F� t -'ANO t '21I L. F� -XUW :+lCtF'�f f,. 4�lCi"v`SP! idtlFJEt r�`iTt'TRJ`1et31` ��'ri F� �II�OF'ILE `IT`�(��T UF''PE� •NELs� WETLAI'�IOi . Ffgure 14 ,;--:Wb3r Pond Op g: . chemaj1C:S. , 345 0+50 1 +00 1 +50 2+00 2+50 3+00 PROFILE SCALES 1'=51 M 1."=50' (H) TION 3+50 4+00 RETENTION BASIN NOTES: 1. SEE DETAIL ON THIS SHEET FOR RISER TRASHRACK/FRAME & COVER. 2. STATE APPROVED TRASH RACKS SHALL BE INSTALLED ON ALL ORIFICE OPENINGS. 3. A CONCRETE FOUNDATION SHALL BE INSTALLED ON THE RISER AS SHOWN & MEETING THE MINIMUM SPECIFICATIONS SET FORTH 1N THE VESCH SPEC. #3.14. 4. THE PROPOSED SIDE SLOPES OF THE BASIN ABOVE THE MWSE SHALL BE A MAXIMUM OF 4:1. THE PROPOSED SIDE SLOPES BELOW THE MWSE SHALL BE A MAXIMUM OF 2:1. 345 PROPOSED 45' IDE GRASS LINED E ERGEN Y SPILL AY CREST E LE V _ 338. 51 340 340 XISTING 3RADE , 45 335 335 330 330 J J W W W LW 0+50 0+75 PROPOSED GRADE -PROPOSED EMERGENCY SPILLWAY SIDE SLOPES SHALL BE 4:1 OR FLATTER TO PROVIDE A SMOOTH VEHICULAR TRANSITION ALONG THE ACCESS ROAD & TO PROTECT THE GRASS LINED SPILLWAY. T o7�f � O SCOTT R. COLLINS � iU No. 35791 � ly TONAL E w w z Ln N N N W 0 0 Z (A W o Z o V z 0> M � o lL >d. W Ce � N N 0 o Z Q JJ Q a z W Z J O U O � O U 1� � 3 Q- c) W W 0 a� _C ae. C Z � O L W V �- p o � a 0 Q O U i W O U Ln fn -% W" 0 N N Y W H Z U) _W W J~ J� W �a 0 0 U" z U W > a] Uj 0 t 3 N O � I V / > D u- o -� Ulc � s U. Uc 0 c E -'� c H a c t C6 -C V / Q c L c L a Js Uj c V � Qc Zz N Q c c L z iz LL LL Z Ui z fl LL V C C c Uj 0 (� c V I V) 'c c a W v c a a s a t v z + a U W � Z = a a JOB NO. 102054 u z z L SCALE AS SHOWN z SHEET NO. a 8 a J � • r -• r r ..�-• •r • 4� sl+.. r: %ice/��� �� . ,� !/ •/J�/�'�% . �.:. •�,/� %%!�f . "1J �Q/,:jam%j � `/�`j�J` i \ � I I ♦ • . T .tits• i • yT • !? %l .i:::: � / / /!\/ � ,r.', /1�J�/��li\l���l��l�'`J ' . /� jj`/`! - r�>`�i` Y.,'1��` ,'N .:.. • �....: �'� °V •.mot a:/ !•�♦ �\• ./; ••..::�� 'mot � . -. / i `/` \ f ., O �e!„�:.. F • •i!./ !/vim/! f/` �.Q/� ^4 NO • r r t • •1�/.. • � � �� 1 It.�/ems ;I,�y ./ //..•� ./! /��/ .�� \ ! t ! t ! \ / ! Q / \\ .!� , � •J/ Ste'! •/!! r .. ii ti/��� I� 3•, • ! U h\ l / 1c�Y �o ! / p • o 0 0 ! � o .o / o .o •o h 0 ! O O O •O O O o O 1 ° .O •O ,. •' fir, �' � #�YQ �Y� '�= .�!%% fig!"..: .. ''• r • . • t r1�`�` RETENTION BASIN PLANT & SEED SCHEDULE SYM BOTANICAL COMMON NAME SIZE QUANTII`Y ZONE 2 PLANTINGS LM LEMNA SP. _ ,DUCKWEED n/a _ 825 sf of (Coverage PC. PONTEDERIA CORDATA PICKERELWEED 1 gallon buckets _ 8CO NIL NUPHAR LUTEUM SPATTERDOCK n/a 700 sf of (Coverage CO CEPHALANTHUS OCCIDENTALIS IBUTTONBUSH 24" min. height 22 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 (REQUIREMENTS vs. S T APPLICANT HAS F ROVIDED A COMPREHENSIVE EMBANKMENT' DESIGN I T RECOMMENDATION HE A 1 G� AT DOES H NOT REQUIRE A GEOTECHNICAL STUDY DURING THE SITE PLAN REVIEW STAGE. SUCH IS THE CASE DUE TO THE PRECAUTIONARY EMBANKMENT DESIGNS PROPOSED. A SUMMARY OF THE EMBANKMENT DESIGN REQUIREMENTS ARE LISTED BELOW, MANDATING THE CONTRACTOR MEETTHESE REQUIREMENTS AT A MINIMUM. THE EMBANKMENTS SHALL HAVE A COMPACTED CLAY CORE WITH A CUTOFF TRENCH & BE IN ACCORDANCE WITH THE DETAILS SHOWN ON THESE PLANS AND IN APPENDIX A (EARTHEN EMBANKMENTS) OF THE VA DEQ STORMWATER BMP CLEARINGHOUSE. 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 (VON 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 SWM FACILITY CONSTRUCTION SHALL BE APPROVED BY AN ONSITE GEOTECHNICAL ENGINEER PRESENT DURING THE CONSTRUCTION OF THE EMBANKMENTS AND FILL AREAS. VA P O: $-i' R P'f WN S: CIF(C.AT1011• A Vu.)C-Ti bi WET FOND CONSTRUCTION NOTES: FACILITY 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 1 PLANTS AND TOLERANTTO 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 VEGETATED 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 BE CONSTRUCTED WITHIN THE BUFFER AREA. EXISTING TREES SHOULD 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 GREAT THAT 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 THE 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. FACILITY 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 CONTROL 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 BOTTOM ELEVATION OFTHE WET POND SHOULD BE LOWER THAN THE BOTTOM ELEVATION OF THE TEMPORARY SEDIMENT BASIN. APPROPRIATE PROCEDURES SHOULD BE IMPLEMENTED TO 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 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 ASSEMBLE CONSTRUCTION MATERIALS 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&S CONTROLS PRIOR TO CONSTRUCTION, INCLUDING TEMPORARY DE -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, CONTRACTOR SHALL EXCAVATE THE CORE TRENCH AND INSTALL THE SPILLWAY PIPE. 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. 8. CONTRACTOR SHALL CONSTRUCT THE EMBANKMENTAND ANY INTERNAL BERMS IN 8-TO 12-INCH LIFTS, AND COMPACT THE LIFTS WITH APPROPRIATE EQUIPMENT. 9. EXCAVATION AND 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. THE EMERGENCY SPILLWAY SHALL BE CONSTRUCTED IN CUT, OR STRUCTURALLY STABILIZED SOILS. 11 INSTALLATION 0F THE OUTLET PIPES, INCLUDING DOWNSTREAM RIP -RAP APRON PROTECTION, SHALL NEXT BE PERFORMED IN THIS SEQUENCE. 12. STABILIZED EXPOSED SOILS WITH TEMPORARY SEED MIXTURES APPROPRIATE FOR THE POND BUFFER SHALL BE INSTALLED. ALL AREAS ABOVE THE NORMAL POOL ELEVATION SHALL BE PERMANENTLY STABILIZED BY HYDROSEEDING OR SEEDING OVER STRAW. 13. THE CONTRACTOR SHALL PLANT E POND BUFFER AREA FOLLOWING THE LANDSCAPING PLAN AND REQUIREMENTS. 0 H NT THE F R Q REMENTS. 14. DURING CONSTRUCTION, ADEQUATE MAINTENANCE ACCESS SHALL EXTEND TO THE FOREBAY, SAFETY BENCH, RISER, AND OUTLET STRUCTURES AND MUST HAVE SUFFICIENT AREA TO ALLOW VEHICLES TO TURN AROUND. 15, THE RISER SHALL BE LOCATED WITHIN THE EMBANKMENT FOR MAINTENANCE 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 BUILT 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. 17. A MAINTENANCE RIGHT-OF-WAY OR SWM EASEMENT SHALL EXTEND TO THE STORMWATER POND FROM A PUBLIC OR PRIVATE ROAD OR ACCESS. 18. 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 STORMWATER BMP CLEARINGHOUSE. SOILS FRACTURED BEDROCK, L SUSTAIN A PERMANENT L O WATER. GEOTECHNICALTESTS CONFIRM THE T S INCLUDE THE FOLLOWING: 19 WHEN A STORMWATER POND IS LOCATED OVER HIGHLY PERMEABLEOR CTURE R K, A LINER SHALL BE INSTALLED TO IN E P00 F WA R. IF GEOTECHNICA M E NEED FOR A LINER, ACCEPTABLE OPTION N N D TABLE 1 L 0 OL - CHEMICAL S 0 REQUIREMENTS E G N D 1 A CLAY LINER FOLLOWING THE SPECIFICATIONS OUTLINE IN T E 4.4 BELOW; 2 A 3 MIL P Y LINER• 3 0 ' OR 4 USE OF (HEM A ADDITIVES. DESIGNS AND INSTALLATION R MEATS ARE TO BE PREFORMED BY A LICENSED N r EER AN () C , () , ( )BENT NITE, (} Q ARE NOT PART OF THIS PLAN. A CLAY LINER SHOULD HAVE A MINIMUM THICKNESS OF 12 INCHES WITH AN ADDITIONAL 12 INCH LAYER OF COMPACTED SOIL ABOVE IT, AND IT MUST MEETTHE SPECIFICATIONS OUTLINED IN TABLE 14.4. Table f4.4. Clay Liner Speclfca6ons n;. ti .,t::.:.... Penn eability ASTM D-2434 Cnnlsec I x l Plas iicity Index of Clay ASTM D-423/424 % Not I ess than 15 Liquid Limit of Clay ASTM D-2215 4,0, Not i ess than 30 Clay Particles PasBrng ASTM D-A22 ° Not less than 30 Clay Compaction clion ASTM D-2216 95% of standard proctor density I ciurce,: Virginia stormwat.er management Hanunw 1;iugq� CONTRACTOR REQUIREMENTS: 1. THE CONTRACTOR SHALL BE RESPONSIBLE FOR LAYOUT OF ALL WORK COVERED UNDER THESE PLANS. 2. LANDSCAPE CONTRACTOR SHALL REFER TO THE STANDARDIZED LANDSCAPE 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 ASSOCIATION, 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 BY THE•AMERICAN ASSOCIATION OF NURSERYMEN, 1250 STREET, NW, SUITE 500, WASHINGTON, DC 20005. 4. THE CONTRACTOR SHALL VERIFY ALL DIMENSIONS IN THE FIELD AND NOTIFY THE DESIGNER OF ANY VARIANCE FROM THE PLAN. 5. THE LANDSCAPE CONTRACTOR IS RESPONSIBLE FOR VERIFYING THE LOCATION OF ANY ONSITE UTILITIES (CALL MISS UTILITY 1-800-552-7001 BEFORE ANY EXCAVATION). 6. REFER TO THE APPROVED FINAL SITE PLANS FOR ANY DETAILED SITE 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 GROWN. 9. ALL PLANT MATERIAL, UNLESS OTHERWISE SPECIFIED, SHALL BE 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. ALL 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 TIMES BY COVERING THE BALLS OR ROOTS WITH MOIST SAWDUST, WET BURLAP, WOOD CHIPS, SHREDDED BARK, PEAT MOSS, OR OTHER SIMILAR MULCHING MATERIAL. COARSE PERVIOUS BU O AS W 12. THE OWNER RESERVES THE RIGHT TO SUBSTITUTE PLANT MATERIAL TYPE, SIZE AND/OR QUANTITY. ANY SUBSTITUTIONS MUST BE APPROVED BY THE DESIGNER. SHELL ZONE 13. MINOR FIELD ADJUSTMENTS MAY BE NECESSARY DUE TO SITE CONDITIONS (EX: ROOTBALL AND UTILITY CONFLICT). MAJOR ADJUSTMENTS MUST BE APPROVED BY THE DESIGNER. 340 340 14. NO PLANTING SHALL OCCUR WHEN THE SOIL IS FROZEN. PROPOSED IMPERVIOUS, .y 15. PLANT MATERIAL D EXISTING SOIL WITH EACH PLANTING PIT EXCAVATED O SIZE C IN THE ENTIRE ROOT BALL O ROOT MASS WI U T STOCK. LA T M E JAL SHALL BE PLACE IN fN X T A SUFFICIENT CONTAIN H E R THO T CRAMPING R00 T R COMPACTED CLAY CORE } ;,; A - 16. THE CONTRACTOR SHALL MAINTAIN A ONE (1) CALENDAR YEAR 90% CARE AND REPLACEMENT WARRANTY FOR ALL PLANTINGS. THE PERIOD OF CARE AND REPLACEMENi`SHALL BEGIN AFTER INSPECTION AND APPROVAL OF THE COMPLETE INSTALLATION OF ALL PLANTS AND :.. }r' � CONTRACTOR TO INSTALL CONTINUE FOR ONE CALENDAR YEAR. ASSUMED PHREATIC LINE . TRANSITION FILTER BETWEEN THE 17. THE CONTRACTOR IS RESPONSIBLE FOR REMOVAL AND DISPOSAL OF TRASH AND DEBRIS WITHIN THE LIMITS OF THE PLANTING ON A DIAILY BASIS. _ _ (4H:1V) CONSERVATIVELY IMPERVIOUS CLAY CORE ZONE & THE 18, THE CONTRACTOR WILL NOT BE RESPONSIBLE FOR PLANT MATERIAL THAT HAS BEEN DAMAGED BY VANDALISM, FIRE, OR OTHER ACTIV/IT1ES BEYOND THE CONTRACTOR'S CONTROL. ASSUMED AT so YR WSE. s ,k UPSTREAM PERVIOUS SHELL ZONE. THREE 8 x8 ANTI -SEEP] ' ' -; .- 335:°FACILITY MAINTENANCE: COLLARS 25' O.C. MAINTENANCE OF ED PONDS IS DRIVEN BY ANNUAL INSPECTIONS THAT EVALUATE THE CONDITION AND PERFORMANCE OF THE. POND. DURRING THESE INSPECTIONS THE FOLLOWING TASKS SHALL BE PERFORMED BY THE CONTRACTOR IN THE FIRST YEAR FOLLOWING INSTALLATION, OARSE PERVIOUS AND THE OWNER THEREAFTER: CONTRACTOR TO INSTALL •f"_f , ; , SHELL ZONE 1. MEASURE SEDIMENT ACCUMULATION LEVELS IN THE FOREBAY, INTERNAL PERFORATED 1:=<. %t:a. >:> ; ____<_'::::_< ::<:::: 2. MONITOR THE GROWTH OF WETLANDS TREES AND SHRUBS PLANTED AS APPLICABLE. RECORD TH , E SPECIES D T PP PROM MATE C AN HEIR A R M E COVERAGE, AND NOTE E PRESENCE OF THE AN SP Y INVASIVE PLANT ECIES AS P A PLICABLE ANT SEEP COLLAR NOTES: FOUNDATION DRAIN SURROUNDED 3. INSPECT THE CONDITION OF STORMWATER INLETS TO THE POND FOR MATERIAL DAMAGE, EROSION OR UNDERCUTTING. a.. THE CONTRACTOR SHALL INSTALL THE COLLARS SUCH THAT r `.I.., z :: . f:;:> :: BY GRAVEL G EL TRANSITION FILTER ;.::.,.tt :. ;,.:.:.,..:.:,:.. . , .:.,. - , ., 4 INS ECT T E B P H ANKS O F UPSTREAM AND DOWNSTREAM CHANNELS FO R EVIDENCE OF SLOE GHING ANIM AL GY CONTRACTOR TO INSTALL TOE DRAIN 330 :.> 330 RROWS B G ARE OODY G O CREASE THE SEE LENGTH THE BARREL BYA R WTH, OR GULLY EROSION THAT MAY UNDERMINE EMBANKMENT INTEGRITY. THEY IN PAGE LEN , 5. INSPECT POND OUTFALL CHANNEL FOR EROSION, UNDERCUTTING, RIP -RAP DISPLACEMENT, WOODY GROWTH, ETC. MINIMUM OF154THIS PERCENTAGE 1S BF THE PIPE 15 ASSUMED ON THE LENGTH 6• INSPECT CONDITION OF PRINCIPAL SPILLWAY AND RISER FOR EVIDENCE OF SPALLING, JOINT FAILURE, LEAKAGE, CORROSION OR OTHER FAILURES. OF THE PIPE IN THE E SATURATION ZONE. IF THE 7• INSPECT CONDITION OF ALL TRASH RACKS, REVERSE SLOPED PIPES OR FLASHBOARD RISERS FOR EVIDENCE OF CLOGGING LEAKAGE DEBRIS ACCUMULATION OR OTHER FAILURES. TO BE FULLY IN THE SATURATED ZONE & IS 72' LONG, THEN THE 2' n W TRANSITION FILE T THE TOE OF FILTER I E SEEPAGE g INSPECT MAINTENANCE ACCESS TO ENSURE IT IS FREE OF WOODY VEGETATION, AND CHECK TO SEE WHETHER VALVES, MANHOLES AN D LOCKS CAN BE OPENED AND OPERATED. COLLARS NEED TO BE INSTALLED SUCH THAT THE EE THE: EMBANKMENT s PERVIOUS SHELL <: ':;.`x f:;<•>_' LENGTH IS EXTENDED BY�1' o.z x Ls ), AS SHOWN. THE INCREASE 9INSPECT INTERNAL AND EXTERNAL SIDE SLOPES OF THE POND FOR EVIDENCE OF SPARSE VEGETATIVE COVER, EROSION, OR SLUMPING, AND MAKE NEEDED REPAIRS IMMEDIATELY. ( s RELIEF WELLS DEEP % IN SEEPAGE LENGTH REPRESENTS THE TOTAL COLLAR FACILITY INSPECTION: PROJECTION REQUIRED, WHICH CAN BE PROVIDED FOR BY ONE TRENCH DRAIN ' ,• ` ' ;. OR MULTIPLES COLLARS. MULTIPLE INSPECTIONS ARE CRITICAL TO ENSURE THE BASIN(S) ARE PROPERLY CONSTRUCTED. BECAUSE THE TIMING OF THE INSTALLATION( IS DICTATED BY THE CONTRACTOR, THE CONTRACTOR SHALL BE RESPONSIBLE FOR CONTACTING THE ENGINEER AND INSPECTOR PRIOR TO 325 325 2, THE MAXIMUM COLLAR SPACING SHALL BE"i+4xTHE MINIMUM INSTALLATION. MULTIPLE SITE VISITS AND INSPECTIONS ARE REQUIRED TO BE SCHEDULED BY CONTRACTOR, WITH THE ENGINEER AND (INSPECTOR, DURING THE FOLLOWING STAGES OF THE BASIN' CONSTRUCTION PROCESS: CONTRACTOR TO INSTALL A FOUNDATION '' PROJECTION ABOVE THE PIPE. THE MINIMUM( COLLAR SPACING 1. PRE -CONSTRUCTION MEETING SHALL BE 5x THE MINIMUM PROJECTION. WITH A BARREL 2• INITIAL SITE PREPARATION (INCLUDING INSTALLATION OF PROJECT E&S CONTROLS) CUTOFF,rkENCH (4' WIDE, 4' DEEP w/= SIDE DIAMETER OF 30" & PLATE COLLARS MEASUkING 8'x8', THE 3. EXCAVATION/GRADING (E.G., INTERIM/FINAL ELEVATIONS) SLOPES, MIN.) W/TRANSITION FILTER IN BETWEEN PERVIOUS SHELL & THE CLAY CORE PROJECTION ABOVE THE PIPE WILL BE 2.75','THIS RESULTS IN A 4. BASIN INSTALLATION (E.G., INTERIM AND FINAL ELEVATIONS) 5• FOUNDATION IN ACCORD. W/ DEG APPENDIX A MAXIMUM COLLAR SPACING OF 38.5' AND A MINIMUM COLLAR INSTALLATION OF THE EMBANKMENT, THE RISER/PRIMARY SPILLWAY, AND THE OUTLET 5TRUCTURE(S). . 6. PLANTING PHASE (WITH AN EXPERIENCED LANDSCAPE ARCHITECT PRESENT) ' SPACING OF1.375• --1 320 320 3• THE MINIMUM TOTAL NUMBER OF COLLARS (REQUIRED IS FOUND 7. FINAL INSPECTION (DEVELOP A PUNCH LIST FOR FACILITY ACCEPTANCE) PROFILE SCALES BY DIVIDING THE SEEPAGE LENGTH INCREASIE OF is' BYTHE > 00 E COLLAR PROJECTION ABOVE &BELOW THE PIPE (2.75' x 2), OR 2. cop co 0 4• ALL ANTI- SEEP COLLARS AND THEIR CONNECTIONS TO THE w W In co o rri 00 BARREL SHALL BE WATERTIGHT, MADE OF MIATERIAL COMPATIBLE WITH THE CONDUIT & SHALL B rcV NOTES: 1. SET TREE PLUMB PRIOR TO STAKING. ' 2. ALL PRUNING IS RESTRICTED TO THE REMOVAL OF DEAD AND BROKEN BRANCHES AND SHALL BE PERFORMED UNDER BACKFILL BACKFILL TO TERMINATE TE THE SUPERVISION OF THE LANDSCAPE ARCHITECT. TOP OUTSIDE EMITS OF ROOTBALL -+ REFER TO TREE 3. DO NOT ALLOW AIR POCKETS TO FORM WHILE BACKPILLING• _ ADD MULCH OVERTOP OF STAKING DETAIL 4. IMMEDIATELY SOAK PLANT WITH WATER. ROOTBALL AND PLANTING PIT LIMITS, BEGINNING AT NO MORE 5• SEE IRRIGATION PLANS/DETAILS/SPECIFICATIONS AS THEY RELATE TO THIS INSTALLATION. THAN 1" DEPTH AT TRUNK AND TAPERING UP TO A DEPTH OF S" AT PLANTING PIT LIMITS, THEN TAPER TO PROPOSED FINISHED GRADE 1• VARI S TYP TREE GUYING DETAIL CONSISTS pp OF 2 GUYS,SET 120' AROUND PLANT PIT ON "UPHILL" SIDE SPECIMEN SHRUB (AS SPECIFIED ON ?;e;j •' 1� = ' DRAWINGS] �'' TRENCH EDGE AROUND ENTIRE AREA 70 BE ���� ��� '' :: ROOTBALL -'• �� REFER TO TREE REFER TO TREE STAKING DETAIL MULCHED .�' ��� r ': STAKING DETAIL COMPACT EXCAVATED SOIL TO FORM ROOTBALL PIT CUT AWAY ALL WIRE BASKETS f/ ��� ��/�. \���~ BACKFILL WITH CULTIVATED, NOWBIODEGRADABLE \� \\`C'�� ORIGINAL SOIL' FROM 'PLANT TRENCH EDGE AROUND ON DOWNHILL SIDE OF TREE 4" AND/OR ROOTBALL WRAPPING AFTER �i PIT EXCAVATION IF LOOSE. IF EXCAVATED MATERIAL 15 NOT ENTIRE AREA TO BED►. MULCHED MIN FINAL ?REE PLACEMENT. BURLAP ROOTBALL WRAPPING LOOSE, SUBSTITUTE WITH ACCEPTABLE TOPSOIL REFER TO ROOTBALL PIT ' �\ TRENCH EDGE AROUND ENTIRE AREA TO BE MULCHED i � !I= ) .«. • • ' ' ~ �:;';.. • • „ I� ! :''' � r " - =(� -I� ••, '. ', I ;:;�• "�� .�"r'.:. ;. TO BE UNTIED FROM TRUNK AND CUT AWAY TO A POINT AT LEAST t/2 DISTANCE DOWN MATERIAL. AMEND BACKFILL PER SPECIFICATIONS. COMPACT BACKFILL IN LIFTS BY F007. / DETAIL t, ^• ;�� �� •,� .;'. �. ` ')- �-= '"� :.•: s,. • ti»•+' ,r l� I_ ROOTBALL ROOTBALL. WATER THROUGHLY AT 1/2 DEPTH. ••• •i +Y•;h•• �. �. ;:•�;:•"; » I;'.; " \ / +�'s• �N ! :,• \ i;N•�`;' �•- .� "• r;: ,;{;:';::i:•. r +'•' REFER TO ROOTBALL PIT DETAIL �;=%z ,;• )l -- - t SCARIFY BASE OF PLANT PIT WHEN EXCAVATING PTT: BREAK RETURN AND COMPACT LOOSE \ / `'' `' ''::;�' � ,'; �i/��� /;;;;; : � �t•'� :�:'::;: "•' •,,. _ =` i THROUGH AND LOOSEN ALL EXCAVATED MATERIAL ?0 ROOTBALL : :.�: + • ''" �\�\� •1•• • ••• 1 ••i• +�' \/�' ; . ROOTBALL ; .i;:, ;, `�\ .;., ',ti ..:• f,.,. �:;.. " ;; ���'__ :; . _ �j 41 . ; s j� �I' HARDPAN (REMOVE S NECESSARY T R COL E FACILITATE S 0 FA I ITA DRAINAGE) ] PLANT PIT TO ESTABLISHED PROPER DEPTH PRIOR TO �� � � PLANT PLACEMENT NNN NOTES: REFER TO ROOTBALL PIT 1. NOTIFY LANDSCAPE ARCHITECT OF ANY SITUATION WHERE SOIL CHARACTERISTICS ARE NOT NOTES:' NOTES: DETAIL AGREEABLE- -TO. THESE PLANTING CRITERIA -OR • WHERE• CONDITIONS -RAISE CONCERNS -IN - TERMS OF PLANT SURVIVABILITY OR WARRANTY. 1. SET TREE PLUMB PRIOR TO STAKING. 1. SET TREE PLUMB PRIOR TO STAKING ALL PRUNING IS RESTRICTED TO THE REMOVAL OF DEAD AND BROKEN BRANCHES AND 2. ALL PRUNING IS RESTRICTED TO THE REMOVAL OF DEAD AND BROKEN BRANCHES AND 2. CONTRACTOR TO NOTIFY LANDSCAPE ARCHITECT OF ANY PLANT DAMAGE EXPOSED BY, OR INCURRED DURING, PLANTING PROCESS. 2. SHALL BE PERFORMED UNDER THE SUPERVISION OF THE LANDSCAPE ARCHITECT. SHALL BE PERFORMED UNDER THE SUPERVISION OF THE LANDSCAPE ARCHITECT TREE PLANTING TREE PLANTING ON SLOPE SHRUB PLANTI4�G ROOTBALL PIT 1 a s �fl 4, 4 I •�. 12 SECTION N.T.S. 12 SECTION N.T.S. 12 SECTION N.T.S. 12 SECTION N.T.S. T oFr 0 SCOT R. 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