20050613 Ver 2_Stormwater Info_20080522

SPAULDING & NORRIS, PA
Planning • Civil Engineering ? Environmental
May 20, 2008
Ms. Annette Lucas -,
NCDENR - Division of Water Quality
401 Oversight and Express Permits Unit ?2321 Crabtree Boulevard , wr
Raleigh, North Carolina 27604
' rAlvc
RE: WEST LAKE SUBDIVISION - PHASES 1 & 3 w,r
MODIFIED STORMWATER MANAGEMENT PLAN
Cary, Wake County, North Carolina
Dear Ms. Lucas:
You may recall, DWQ issued a 401 Water Quality Certification and approved the Stormwater Management
Plan for the above referenced project, which required forebays to be included in the extended dry detention
ponds, under DWQ Project # 05-0613 and dated November 8, 2005 (Ref. USACE Section 404/NWP 14
Action ID 200521094). Per a request from the Town of Cary Engineering Department, the Stormwater
Management Plan for the project has been modified. The Plan was revised to eliminate the forebays
previously included in the extended dry detention ponds (Ponds 1 through 4). The Town Staff has formally
approved this modification. Enclosed for your records are a letter of approval from the Town dated May
20, 2008, and a copy of the revised Grading and Drainage Plan (Sheet C-5) sealed on May 14, 2008.
Please let me know if you need any additional information to complete this request. Thank you for your
assistance with this modification.
Ah rely , anie .Norris, PE
Spaulding & Norris, PA
Enclosures
Cc: Matt Flynn - Town of Cary
Matt Osborne - D. R. Horton Homes
Phone: [phone] ? Fax: [phone] •972 Trinity Road • Raleigh, North Carolina 27607

?ENGINEERING DEPARTMENT

May 20, 2008
Stephanie L. Norris, PE
Spaulding & Norris, PA
972 Trinity Road
Raleigh, North Carolina 27607
Dear Ms. Norris:
You have the approval from the Town of Cary to remove the forebays from dry ponds 1, 2, 3, and 4. The drainage area to
each of these ponds is less then 10 acres. Per DWQ specifications, ponds intercepting drainage areas with less than 10 acres
are not required to have forebays.
Sincerely,
ZZ Flynn
Town of Cary Engineering Department
TOWN Of CARY
318 North Academy Street *Cary, NC 27513•PO Box 80059Cary, NC 27512-8005
tel [phone] fax [phone] www.townofcary.org
_ _ _ _ _ _ _
n _ ; s _ r FES ~ ~ ~ t ' , r ~ / ~ m ~ J ~ ~ i-. . - _ . ,J ~ ~ F :
~ J ` r r ~ r ; f ~ ~ / R o
n n. ~ i n F - , - , E~ OF ER - F 0' 'fYP B ~ ~ • 20' TYPE B ,BUFFER ~ ~ kf 1 ' ~ r ~ ~ r ~ ~ ~ / i'` i ~E¢dE GEN~CY SPILLWAY ~ 1tr ~ ~
_ _ _ , n ..h r t ~ ,1 r i j . ~36s ~ Q >
A, ~ , FES f ~t , ' Yt _ ~ ;
, N + P~RMA GHANNE A L ET N. 6 D SEWER 'EASEMENT ' SEE DETAIL.THIS SHEET ll DE~NTION PO,i~D ' ~ ~ z a z
I , s o CB 0 I : < I r Fc1~SEMENT ~ ' ~ ~ ~ ~ ~ ~ ~ ~ w w . `r. i ~ ~ QU OU ga f
•31 _ 5 I ti ~ POND ~2 ~ ~ ~ ~ a ~
_ ~ ~ _ 5 I~ '6 ; g ES ~ ~ ~ I ~ U~ U~ a~ ~ a 9 '
_ r~ _ G i W ~O ~ ~ UZ g U
, : ' >1 ; D ~ ~ ~ ~ o
CB ,T ~ ; 51 ~ ,
L YI O ` CB ~ r ~ ~ ~ ; ~ \ ~ ~ o ~ o 0 0 0 0 w i ~ ~ 38 35 ~ j WETLANDS LIMITS a o a ~n a r a s
~ CB 4~o DOUBLE CB + ~ _ WOLFS BANE AY ~ ~ INLE ~~2 ~4~0 . , M
,1, ~ / N " M ;.._.y., ~ , , ~ , . - , - - ~ ~ r-, ti - _ .T, ~ n _ t. ~ ti ~ 2#"RG r.M. w _ R ADER 2 ~ In
- , , ~ ,,per( - . f , 24'RCP . - t ~ ~ ~ ; l~~ SP E ' ~ ~ ~ Q~TLE 209 i~r ~ 40 ~ 1 OC!. 36 RC -t
s+nU I as 1 ~ . ii oa. ° , ~ ia+oo +oo~`~ ~ ~ ~ _ ~ ~ . 1. _ _.o i., _ . - , i ~ PIPE
, r ~ I 3A 1 ~ ~ ~ - ' a GRASS 1'
- - r 5 /i, ~ , r ~ - - _ , ~ 'S SWALE ` • ,n ~x
, ,Y ~ ~
, ~ _ P. _ , ~ ~ u . - ~ t , ~ - - , ,
i I y,~ . , I I ` ~ '18R ' 18 R 41. ~ . ~ • ~ ~`x . 32 `v ~ ~ c~, Z ~
~ ~ ' - _ ~ ~ ~ ~ ~ EMERGENCY SPILI~N Y ~ ~ ~ CEL ~ r ~ - _ ~ 40 _ _ V d ~ d '
, ~ _ 41 w 40 39 t 73 l W ' _ - _ - G ~ i POND 1 ,
FES ' 2~~ ~l ` o ~ , ~
i , ± ~ k f N~~1S fd~~ tta _ \ 'DOUBLE 66 ~ ~~n,~-29h
~ , AY' 1 : ~ ~ i _.,.r.. - - l ~ ~ OUTLET PIPE a I^.'' ~ ~t~ hl ~ 14 ~ ,~1 INLE 33 H~ T
I , t r.---- G ASS ~ ~ ~ , ti. ~ , i~~ . ,
~ ~ SW LE ~ LEVEL' u . , k ~y . ~ k~
' ~ ~ SPREADER E 110N POND _
I ~ EASEM i Vii', 1:
75 ` r AD ~ o '~'r ~5 ~ ~ , ~
- ~k~a- .APPROVED DW(~'~NRB ~ t4a 43 , .
c IMPACT ~ ~ 37 . ~ , o ~ ~ 4
li ! 0' ` q~ ~ ~ TLANDS 7Z ~ ,
~ Y P `~F NYT 9 ITS ~ ~ ~ ~ r ~q o•' LIM Y - r Z H ' 2~ 15 ~ N
a ~ R 44 F8 T 7 j, i , ~ ; s i ky - ~ , ~ { , , ~
~ ~~ro . ~ ~ ~ - ' ~ ~ ~J a , , ~ 1 ~ , ~ = V ~ Q
,f L t = i ~i~ ~ ~ ,1
i ~ ~ I~ ~~V , x r ~ n , I ~ r ~h~ ~ ~ ~ ~ ~ i ~ ~ ~ ~ ' ~ ~ ~
~ r C, ~ , . - 1 , I I , 45 oo ~r I ~ ~ ~ ~ , i _ ~ i ~ ~ ~
, ~ _ • , ~ ~ r • I , i. ~ , ~ r A ! '4~, ~r.. ~ ~ ~ r
1: ~.,~J ~ r 1 ~J~ ~ ~v , t . r. ~ > _ - .F ~ r ~ .t 4 ! ps
} ~ i I I t- I ~ 1 ~ h - ~ ~ t. ~ Y i ` ~ , v~ . ~ . f _
.,r , ~ : , ' js Jry i J ~ I, F I t I I , : r I ; . _ ~ I E r 1 i ~ , i' 4 ICI. ii ~ ~ ~ O ~
~ ~ ~ t ~ ~ ~ ~ ti`v : , ,w. - r~
~ ~ ~ 46 . ~ r ~ - ~ ~ 28 ~ I ' i ~ i ' I' i
' ~ ~~l` , ~ ~ . I , r I 1 I - - - ~ , 1 1 ~ ~ t ~ ~ ~ 1 ~f 1
~ ~ ' r ; , ~ ,1 a`~ ,
: d 7~ > CB , , r , : I i ~ ~ - x t , ~ 21 ~ ~ ~ f / r " ~ i ~ t ~ r 1 i ~
: _ ~ , a x;... v I 4 ~ ~ _ ~ ~ ~2 ~ 1 I ~ ~ ' ~ ~
, : .x a.-. ~ , . , - ~ f ti ~ , , ~1~
~ I 1 ~ I. - \ i ~ ~ o
, , ' ; 69` s ~ - e \ ~ C~' ~ 27 1~ l 1 f 1 ' r, ~ ~ r~ _ 25 1 C / 1 r 1
, CB ~ ~ , . , . . ul r ~ f
LEGEND ~ _ _ . _ _ , _ , i r 7 ~ i ' i ~ / ~ ~ J I / ~ / 7 / ~ - , _ , / ~ ~ qQ f 4-
~ , , f , ~ ; - ,Q ~ ~ , _4, _ ~ . T ~ i E
r 'WETLANDS , , - m ~ : r ~ - ~ 1 / / / ~ ! X16 r ~ ~ ; ~ ~ ~ 29-
I _ . ~ , , ~ r ` _ ~ _ , 1 ~ l ' v f . .
,h. ~ ~ , ~ ~ ~ ' PERMANENT ENERGY 01$SIFATER r ' l r f ~ ~ . IV ~ t ` ~ ~ 1. % n f f/
- (~~rt ~ ~ ~ ~ , f i ~ _ - . ~ ~ ~
„ PERMANENT LEVEL SPREADER ~ ~ ~ ~ ~ ~ r ~ ~ ~ - ,~y _ t ~ ~ ~ ~ 1
~ _ 1.. ' , 3 ~ i-' r l . . _ f ~ ~ _
p~ ~ 1 f... L - . \ j _ r / J i ~i ~v~ / ~ ~F _ , ~ _
:.emu , , _ CHANNEL DIMENSIONS ~ _ ~7 ; , = a _ _ i j i E
: , ~ \ ; c w (ft) d (ft) DESIGN STORM ' ~ o w /yyy~ W
, m 6 1.5 10 _ ~ , ~ ~
_Tr _ - T , . m UNE CHANNEL 1W1H NORTH AMERICAN GREEN ~ . '(9 ~ , / U 2 ~ - ~ i W
2 ~ _ , ti _ S76 S75 BN IEMPORA 11N1R { - - E ~ ~ s _ , r r ~ ; ~~f/--' ~ GRASS SWALE j w~ z - ~ ~ ~ v ~ Q s
o (OR APJ?ROVED EWIAL). ' ~ ~ ~ , , i j ~i... j O ~ ~ ~ / . , 1 ~ oPe ~ r ' ~ a 1 ~ ~ i ~ ~ ~ , OUTLET ~ ~ ~ ~ ~ ~ o w o w o r ' f,<
. . C~tASS LINED - ~ + . } ~ III / -PIE ~oodz a i z P o a , ~ ~ : ~ ~ III _ _ ,
I f~ f ~ v i ` , PERMANENT CHA N L E A , ~ - " ~ ~ ~ } - _ ~ _ _ - ' - R
_ , ~ ' , : , ' _ cB d 4., l,~l I ~ ~ r ~ C ' 1 ~ LEVEL ~ i ~ T ry~o
o , ~ _ _ _ , s. , ~~g i' ~ ' FAD@I~ ' P ~ . , . OND 3 r;~ ?tip``
~r NOTES ~ ~ ~ E ~ ~ ~ ~ : CB I ~ f - , l , r 1 % I FES ~ ~ i , x.. , ~ ;
~ ~ ~ - ~ , o~ ~ ~ - i 1 5, ~ r 1D % ~~11~~1~ r , _ . _oti~
~ _ 1. SEE SHEET C-5 .(.GRADING AND DRAINAGE`. ~ ' ~ , _ _ 17 , t~ , _ F.' ~ ~ / , ,
PLAN} FOR LOCATION OF PERMANENT I ' 6 i' 4. l 5~ , , ~ ~ ~ _ ~ 1 -1-'~~T,~NT1~N P01~6 EASEMENT ~ ~ 1
R Y DI (PATER ~ s ~s~ ~ ENE G SS S ~ - , : ~ _ ~ ~ _ l s.
w ° - OION c~' 2. SEE SHEET C 21 FOR ALL DRAINAGE ANt? ER S ~ C ,,JB ~ ~ ~ , ~h+iERGEN,CI",, SPlf1WAY ~ o ~~`b 11 / ~ i'i / ~htid' , ~e' ,
° NTR L CHED LE L DIN. ~ CO 0 S U S INC U_ G .r ~ ~ I I ~ , ~ - , r ; t2 ~ ~ \ o Q - y ~ ~ ' ' ~ ~ ~ - ~ _ ~ ~~Q~~i~' VIII r ~ ~ ~ ~ CI 9
-STORM DRAINAGE DATA .r - ~ 7 , , • 24°Rc .I ~ 24°R ( ~ ~ ~ _ _ ~ _ ~ CP ~ Z
~ ~ , - ':DETENTION POND DETAILS ~ . ~ r''iF D5 ..7. f'(-~" , r_j j l LIMITSN T "y ~ ~ O
a - LEVEL SPREADER DATA.. i ~ 13' ;
a .I- . W ! - .ENERGY DISSIPATER DATA. - ~ ~ x , , - , r~ ~ ~ I• / X14 / ~ ~ ~N Q
s - IMENT BASIN DAT ~j` - 64 i ,i SED A ,
, ~ Y ' _r + ; _ / i
; 0 , _ t- , ~i 6_ t ` ~ . ~ POND '4 / r GRASS SWALE ~ ~ u 1 ~ ~ , _ . , ; ~t~
f CB r. 14 .-r ~ , LEVEL ~ ~ ~ ~ 1 ,q Z 1 ' 'y, ` ~ t ~ REA i _ SP DER O t { Q
° GENERAL NOTES ~ _ ` ; I i ~ : : ~ ' ~ ~ s ~ OUTLET PIPE ~
1 BOUAlDARY AND TOPOGRAPHICAL INFORMATION PROVIDED B'i KENNETH CLOSE,INC, OkTED 2~9-D5. ' r ~ < _ ~ ' i L ROAD, LOT AND GREENWAY LAYOUT PROVIDED HY ETD IN APPRO~IED WESfLAKE PGDPLANS. } , < <; ~ ~ ~ ~ e ~ 54
~ W WETL4NDS DEllNEA1FD C'r 'OIL ~ ~uN OCTANTS INT AND SURVEYED BY PLNNETH CLOSE iN6. , ~ s- ~ , 51 ~ ~ ~ - J,
q 3 Ff;OPERTY IS NOT IN THE t0O YENR FLOOD PER MAP N0. ~/183C0680 t PANEL 680 -0F 810, EFFECT4JE _ <r~ ~ ~Ty ~ f, - , -a DATE , 3-52 63 48
-p 4 CONTRACTOR SHALL VERIFY 1NE LOCATIfJN GF ALL EXISTIN(> UTILITfES, AND SHALL 6F RESPONSI&t€ FOR ~ ? ~ ' ~ ' c ANY CAMAGE RESULTING FROM HIS AGTIVIT7r~. ~ ALL UTILITY LOf-0TOP ERVICE 48 HOURS PRIOR. Y- ~ i' Ai'L;r A ~ WIi 1 TH TiWN CARP STANDARDS AND ~ ~ ~ Q
S ALI_ ,(INSTRUCTION AND MATERIALS SHALT 6F Ifl LRD ~NtE F E J OF =t ~ ~ _ / _ T- ~ r- SPEC,IFiCATIONS , Y _.r 1 v.;^ \ 49 \ ~ ~ ,
~ E nl-L WATER uNES AND SaNITAFr ~EWrR SERVICES SHALL DE INSTALLED IN ~TRIGT ACCORDANCE iNYTH 'r , - . ~ ~,r ? ~ ' ~ ~2~ / A m THE N.L_ PLUMBING ~(1DE (LATEST EDITIONj- _ ~ ~ A~~ O ALL WATER LINES, WATER LINE SERVICES, SANITARY SEWER, SANITARY SEWER SERVIG€S AND STORM • ' ~ t ' ~ ~B . ! ~t ~ , y ~ _ ~ ~ J
t ~ ~ d DRAINAGE SHALL BE LCLATED WITHIN A :0' PUBLIC CASEMCNT. d ~ ~ 15 , ~ t~~'~ : I ~1' ~ J "f - \ . ]5+00. Y 4
8. ALL EXTERIOR SITE LIGH i~NG WELL bE DESIGNED TO PREVEN7 GFF-SITE GLAR€. ~ _ . ; ` , , N ~ ~ 9. ALL STORM DRAINAGE FRAMES !RATES AND HOODS SHALL BE STAMPED WITH "GRAINS TO NEUSE RIVER' ~ i / ~ fi•~ ~CB~., l -~b 2 ~ ~ ~ 'F W m
~ IN ACCGRDANCE W1TE1 TOWN OF CARY' STANDARDS, fY~~ ~ ~ ~ U ~ 10. THE PROJECT WILL MEET ALI OF 1HE REQUIP,EMENTS RELATIVE TO ©CST MANAGEMENT PRACTIf,ES AND ~ P - ~T 1& I ` / - ~ ` 4 . ' _ i _ - _ ~ tr~
, ~ o{, v ~ ENGINEERING STORMWATLR CONTROL STPUGTURES AS OUTLINED IN THE TOWN -OF GARY UNIFIED ~ ~.~n- . ' ~ / I DEVELOPMENT ORDINANCE (CHAPTER 7. PART ~J, LDO) ~ ~ ~ ~ 30 y,. t - ~@ ~ w~' `7
1'1 THE ESTABLISHMENT OF PERMANENT GROUND COVER WILL BE ESfAEI_i$HED IS WORKING PAYS OR 90 ' ~ , < STORMINATER RUNOFF NNuIAR ~ _ , : ~ yfi. ~ , ' CALENDAR DAY, WHICH LVER IS SHGRTER. ~ y ,u r ~x.~ _
_ _ , ~ 1 ~ THE ,ITE SHALL BE STADIUZCD AND SEEDED PRIOR TO THE ISSUANCE OF V+ CERTIFICATION OF OCCUPANCY. - ~ s ~ ~ ~ - _ , L T, ,wNa~E Is A ~EPARarr_ APPROVAL PROCE~s AND HAS NuT REEK ReJIEavED of xRPROVED As a PART DE ' PRE. DEVELOPED POST-DEVELOPED - ~ ~ ; . , ~ y 'a.
' , ~ THIS DEVELOPMENT PLAN. IF YOU ARE REQUIRED TO SUBMIT A UNIFORM SIGN' PLAN, YOU MUST SUBMIT DISCHARC'~€ ~ ; a 10-YR DISCHARGE 10-YR DISCHARGE - , ; ~ ~ AND OBTAIN APPP,OVAL OF A UNIFORM SITE PLAN PRIOR TO RELEAaE OF PLATS FOR THE RECORDING OF LQCATION 1 ~
L LOT., (IF APPLICABLE), PLATS TO RECORD LOTS CANNOT BE APPROVED UNTIL THE UNIFORM SIGN PLAN. (CFSj (CPS) y.-',,a,,, ~ Y , ,wq, .r-~~'` ~ ~ HAS BEEN APPROVED, ~ ~0
v 1k. THE DEVELOPER WILL BE RESPDNSISLE FOR ALL INSTALLATION C':OST ASSOCIATED WITH STREET LIeHTING POND 1 7.02 Y ~ \ Qo
Q ALONG PROPOSED STREETS, ADJACENT STREETS AND THORDUGHFAPE~ AS REQUIRED PER TDWN OF CARY POND 2 21.60 16.Y1 ~ ~ ~ o ~o } POLJC'Y STATEMENT NO. 13 THE DEVELOPER SHALL GONIACI PROGRESa ENERGY AFTER PLAN APPROV4L ~ ~ o i ~ POND 3 '11.31 4.6'0 ~ ~ AND PPoOR TO fpNSTRUCfION IN ORDER TO DEVELOP A STREET LIGHTING PLAN FOR THE SITE SUBDIVISION ~ M~ 6~ y ` ` ` \ l \ ~ `
m PLANS. POND '4 4.3~ 1.33'. ~ i,( , 15- WHERE EXISTING VEGETATION FAILS TO FUNCTION ADEQUATECf .AS REQUIRED, (i-E. BUFFER TYPE A,B,C AN6 . ; a 1 ~ ~ ~ ` \ t \ \ , \ e,.
10D' THOP,OUGHFARE C~JRRIDOR BUFFER} THE CARY SITE INSPECTOR RESERVES TH€ P.fGHT TO REQUIRE % ti r~ ~ sUPPLFMENT4L PLANTINGS IN ADDITION TU THOSE SHOWN ON THE PLANTING PLAN BASED ON ACTUAL ~ ~ ` , ~ , ~ x
° FIELD CONDITIONS ~ ~ , 1G. ALL TREE PROTECTION FENCING SHALL BE MANTAINED UNTIL ALL SITE WORK 13 COMPLETER. THE FENGIN6~ 05-SB-005 ' _ , .
SHALL BE REMOVED PRIOR TO THE SITE INSPECTION R IHE CERIIHCAIE OF UCCUF'ANY GU >n 17. ALL ABOVE GROUND UTILITY EQUIPMENT AND FACILITIES ASSOCIATED WITH ON-SITE ELECTRIC (ABLE, APPROVED b
TELEPHONE, GAS OR OTHER SIMILAR UTILITY SHALL BE LOCATED IN THE SIDE OF REAR YARD AREA OF THE x~ o ) SITE AND SCREENED, TO THE EXTENT POSSIBLE, WITH EVERGREEN PLANTINGS PLANTINGS SHALL ALLOW TOWN OF GARY ~yx ~O Xo
FOR A MINIMUM OF A 5' CLEARANCE AROUND THE STRUCTURE TO ALLOW FOR ACCESS. ADDITIONALLY, ` i• ANY SIDE OF THE STRUCTURE HAVING P, DOOR OR LOCK, THE PLANTINGS :SHALL ALLOW FOR A TO' f?ATE__........ __._..Y E 'B" BUFFER u: GRAPHI~C SCALE
f 0 CLEARANCE. THE AM01-INi OF CLEARANCE SHALL ACCOUNT FOR SIZE OF THE PLANT MATERIAL AT ~ R 0- MATURITC PLANNING...:::..___ y i ~C-5
18, NO TREE SHALL BE LOCATED WITHIN A ROADWAY RIGHT-OF-WAY' OR WITHIN 5 OF A SIDEWALK. ~0 X30 60 120
0 19. WEST LAKE ROAD IMPROVEMENTS MUST BE COMPLETE PRIOR TO ISSUEANCE OF THE FIRST C.O. ENGINEERING_-_ DATE (o 20. THE DEVELOPER SHALL PROVIDE EACH DWELLING UNIT WITH A TOWN OF CARE APPROVED ROLL OUT SOLID WASTE CONTAINER. THAT CONTAINER WILL BE STORED AT THE DWELLING UNIT AND ON THE SOLID WASTE ~I COLLECTION DAY, SHALL BE MOVED TO THE CURBSIDE BY THE RESIDENT CALL SCOTT HECHT AT PROJECT NUMBER
r 469-4388 FOR THE SPECIFICATIONS FOR THE SOLID WASTE CONTAINER AND TO ARRANGE FOR DEUVERY TO THE TOWN.. , , IN FEET
Ay ! i 556-09 I inch 60 it