20081448 Ver 1_More Info Received_20081217

CAB- ILlLi8
Mitchell Environmental, P.A.
December 16, 2008
Ms. Cyndi Karoly
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center
Raleigh, NC 27699
Re: Kera Gardens Subdivision (Wake County - Neuse River Basin)
Request for more information
Dear Ms. Karoly:
In response to a "Request for more information" letter for Kera Gardens dated 10/08/2008 the
enclosed is the additional requested information. This was in response to the original application dated
09/22/2008.
1. Five copies of the revised Bioretention/Stormwater Drainage Plan. Three sheets: C5 -
Stormwater Drainage Plan, CI I - BMP Details PG 2 & C12 - BMP Details PG3. These are
preliminary plans for review only.
Please feel free to call me if you have any questions or concerns or if you need any additional information.
Thank you.
Sincerely,
&6ju°?-
Robin Eddy
Scott Mitchell
D ? r
i
?t4'?`tN
PO Box 341 Fuquay-Varina, North Carolina 27526
Office: 919-557-4682 Fax.- 919-557-4683
a~- ly~~
X Z I
Y = F- W - J ~ o - ~ 44m
W U - W ~ ~ ~ o 0
U~ U M U~ ~ i RATIONAL METHODIPIPE SIZING TABLE
a1S~H9~A' w ~ ~ ~ ~ ~ , i U Z ~ , z - / . - tc I Cc Q Q
~ =t O II ~ II ~ - ~i CATCH BA. ~ f9 L~ q - CATCH BASINS INLET TIME OF NTENST (INLET) FLOW TOTAL SLOPE Dtheo SIZE Vfull LENGTH UPPER LOWER HOODI a
~ z w o ~ x x P / . FROM U 7< w z Cif' i' - I- ~ ~ " O / FROM TO AREA CONC. (AREA) FLOW INVERT INVERT TOP EL a _(ac) (min) (inlhr)- _..(cfs)- (cfs) _ (ftlft) _ __(in) - (in) (ftlsec) (ftl _ _ _~ft) _ _ (ft~ _(ft) ~ in w
W Z ~ w ~ooq ~ o z ~ ~
W W r'7 o w ~ w N o _ - CB#1A CB#1 0.59 5.0 72 0.50 2.1 2.1 0.0500 7.3 15 11.8 27.00 470.01 468.66 477.10 ~ ~ a
w ~ w ~ , ~ ~ ~ s o- CB#1 CB; W ~ co O~~UI i' CB#1 CB#2 0.17 5.0 72 0.90 1.1 3.2 0.1000 7.5 15 16.6 103.58 468.66 458.30 477.10 8 S °
d- ~ ~ , U J f- d- ~ O q - -C'L~ ~ II d U w _ - .,I ~ o ~ CB#2A CB#2 029 5.0 72 0,50 1.0 1.0 0.0500 5.6 15 11.8 27.00 459.65 458.30 46722 ~
_ ~ • _ w, CB#2 CB#3 0.04 5.0 7.2 0.90 0.3 4.5 0.1000 8.5 15 16.6 89.37 458.30 449.36 467.22
X O ~ W d' CD ~ .P- ~ ~ w I- _ - ~ ~ Urn x~ CB#3 B ~ s - CB#3 BPS#1 0.72 5.0 7.2 0.50 2.6 7.1 0.0982 10.1 15 16.5 44.42 448.36 444.00 457:50
R ~ _ .w, = - - _
„ - _ ~ r ~ ~ CB#6A CB#6 0,49 5.0 7.2 0,50 1.8 1.8 0.0100 92 15 5.3 27,00 462.09 461.82 466.37 ~ ~
J . ~r ~ w ~ ~ ` CB#6 CB#7 0.01 5.0 7.2 0.90 0.1 1.8 0.0330 7.5 15 9.5 155,68 461.82 456.68 466.37 ~ 0 0
~ ~ u) CB#7 JB~ • - _ rn '1 J . P JB#8 JB~ CB#7 JB#8 0.66 5.0 7.2 0.65 3.1 4.9 0.1000 8.8 15 16.6 92.05 456.68 447.48 464.59
x ~ --495 U ~ ~ JB#8 JB#9 0.00. 5.0 7.2 0.00 0.0 4.9 0.1000 8.8 15 16.6 44,57 447.48 443.02 459,00 " ~ ?
_ _ x JB#9 BPS#2 0.00 5.0 7.2 0.00 0.0 4.9 0.0109 13.3 24 7,5 93.47 443.02 442.00 452,00
- 4 °,,,a - _ w. ~ - 1 a G 9 w. - I ; ~ 11i~Ilillll(II~
, ~ O ~ ~ ~ x ~ 3• ~ ~ ~ ~ ~ ~ N:, ~ SPREAD CALCULATIONS FOR BYPASS FLOW (USING FHWA HY-22) ,~'`\c,~P~~S'• ~NC~~'~;,
~g W ~ ~ ~ J " tc I Cc Q Q Q Q Q S T : ~
_ ~p ~ ~ ~ M,., ~r ~ p i~~ x~'~> _ CB# CB# INLET TIME OF INTENSTY (INLET) BYPASS TOTAL FLOW TO BYPASS SLOPE OF SPREAD ' ~ ~ 8 P=
Q z ~ ' ~ ~ ~ I AREA CONC. (AREA} FLOW FROM DOUBLE ROAD (FROM _ ~ , ~
J z ; _ , ~ ~ UPSTREAM BOX HY-22) oJ,`~ $
~ ~ ~g~ [ (ac) (min) (inlhr) (cfs) (cfs) (cfs) (cfs) (cfs? (fflft) (ft) ~%~~~j'~
(n I Z 4,ri ~ ~ I ! ~ ~ - - ~ I' ~ ~ a. I ~ 1 A31M~~,~~, - - - - IIIInuII~~~
U I ~ ; ~ ~ 1A 1 0.17 5.0 4.0 0.90 0.6 _ 0.000 0.6 0.012 0.0955 .2.94
- w, I` I 1A 0.70 5.0 4.0 0.50 1.4 0.000 1.4 0.201 0.0955 4.67 m 2 0.04. 5.0 4.0 0.90 0.1 0.012 0.2 0.000 0.0955 1.63 ~
~ 00 ~ ~ (f ~ ~ ~ ~H= O 2A 2A 0.32 5.0 4.0 0.50 0.6 0.201 0.8 0.042 0.0955 3.49
t I-' ~P~~ ~ U f [ t 3 DOUBLE 0.77 5.0 4.0 0.50 1.5 0.042 1.6 0.8 0.197 SAG 3.52 n
Q ~ ~ ~ J ° I
- 'w R - ~ I1- 6 6 0.01 5.0 4.0 0.90 0.0 0.000 D.0 0.000 0.0462 0.98
- -I p ~ r 6A _ 6A 0.49 5.0 4.0 0.50 1.0 0.000 1.0 0.139 0.0462 4.73
' 7 7 DOUBLE 0.66 5.0 4.0 0.65 1.7 0.000 1.7 0.9 0.206 SAG 3.98 ~ ~ N
y- ~ f ~ € I °a"'~ N ~ r0~M0~
{ t 7 t ~ ~ f~ ~ ~ Q O 6~ ~ ~ W
o ~ - 9 1 ~ I- N ° € ~,r~ h7r ~ I O ANN spa{
oo l ~ r q 1 o N r, ~ ( # 8 ~ ~ o V1
l O ~ • I' ~ - ~ ~ ~ ~x.~ o~ I o~ I ~ ~ Z a Z Dissipaters ~ ~ U o, o Q
1~ ~ N- ( ..t~. ~ o - 3 ~ 8~ w b a~ o ~ a 1 IF ` ~ o ~ ~ Stone ~ ~ ~ a
q ~ . / ~ s E` Z ~ ~ - ~ ~ Z U
M Q Q z w FES Length Avg Diameter Class Thickness ~ ~ ~ o ~
r.° . - w ~ ~ U~~ ~~Q~~ ` U)WZ IyWWa ~ ~ , W W ° z # (ft) tin) (ini ~ ~ z ~
. a ~ i to ~ ~ _ ~ ~ ~ ~ Z C7 W i Q. Q I ~ ~ ~ J Q ~ ; Z (n W h ~wQww 5 12 6 B 22 ~ w q ~ ~ ~
a.~ ~ L ~ W Q.I- W ~ O W ~,J ~ a ~ 6 ~t q Z w ~ w I ~ W Q w 11 ~ 12 6 B 22 o o w cv
~.NfYZ W~~ ~ a ~ ~ v ~ ~ _ p F-- o ~-o ~ Z w ~ ` , , Q Q a ~~~~Q 12 12 6 B 22 p ~ ~ ~ w ~ ~
f I ~ pp.., F-- a Q L~~-~w w ~ = ~ ~ w z O ~ _ ~ ~o 1 ~~p. z Oo~3Qz a~Z~-~ 13 12 6 B 22 W o a°, ~
ozQc N a O . ~WQO~w ; ~ ~ oQ . parr ozQOQ ~l ~ a rn I ~Q~z~
° N O , C i, err z a(noa acnoQ~- U o
/ 1 , ~ 1~ ~ W~
L • U ~,e - U ~ - I ~ ~ _ _ _ w:~ ~ I ~°z ~ ~'ii ~ ~x
r._.- ; -~°°T ~ rM,,..~ , N ~ ~ ~ - I f 6 °r`--~--- - ~ a x ~ ~ ~
~ q 5 ~ Q s / _ , ~ - ,,r ~ _ ~ ~ - - - - - - - - I ,I ~ ~ ~ r- - `1 r-c ~ l 1 ~ ~ ~ . _w~~_ .8 of ~ wzQ ~ O w ~ z
- ~ f i. , ~ ~a., t ~ ~ : _ ~ _ ~ 1 - ~ ~ 1 ,r'
z ~ ~ ~ ~ U ~ i ~ ~ , ~ . ~ q ' Ul - 1- , ~ 1 i \ j 4- ~ a I ~ ~ ~ W W { ~ ~^~~A__ ~ P'al`ms ~
~ ~ ~ / ~ ~ ' d_ ' ~ m~ 1Y Q-~ ' I ~WW~ i3
O ~ ~ ~ o°, ,u f ~ , ~ d \ ` ~ ~ O W W Q w r
d'zN ,I , 9 N { ~ i - ~ ' u \ w ~ NC9~w a Q ® G
~r ~ ~ N ~ ~ , r T~~,,.~~ r~ , t n°~„ Z ~ r w. , ~ ~ ~ , ~ ~d~ ~ ~ . ~OQjJ W ~ ~ ~ ~ ~ ~ ~ Q ~ fY
' , ~ ~ a
` ' _ ~ ~ ~ ~ , , w w z ~.N F r- ~ w w v to w_ U Q w, ~p ~ ~ oz a ~ ~ aQQ ° z ( ~ 1 ~ _ - , -
Y rI, ~ ~ . t
~ ~'7 r ) j i i-J 0~~~~ ~ Q~ r_~~Jf-W ~~~I (LZ' ~ ~
~ ~ ' a ~ O~QpU ~`.~~~w z~wo Owl . _Q~ / ~ U ~ C m a 11 ~~~Z~ -w~ 3 N~ o~ i ~ _ ~ ~ ~ J ~ ~ J
w ~ , ~ ~ ~ , ~ ~ ' q. w o ~ - ~ y, ~ a ~ W.~ W ~1-~Q O rW W' Z W~d`WJ r ~a i~ ~ x
w ~ ~ . ~ ~ ~ ~ z Q w ~ o o r ~ o o Q t, j, . ~ ~
~ ~ ~ ~ ~ ~ ° , w z 'n w ~ _ ~ ~ o U a i o- ~ (ISO
_ € ~ rY a ~ m ~
W ~ ~ W ~ / _ W X 00 ~I' a w, / ~ ~ 1 ~ ~ ~
~ ~ ~ b ~,r rrj O
W n0 _ i ~ 00"x" UJ ~ ~ ~,r W , , z W N ~ ~ ~ ~ ~ ~ , .u, ~ _
0 ~ . 3 ~ - ~ ,m 80
Z ~---~.m r ~ r~ ~ U r, r ~ ~ ~ ~ Q ~ ~ ~ . ; a I Q ~ ~ - ~,_i
. ~ w 1 _ ~ ~r 1,- r~ ° ~ ~ q , : _ a ~ _ ~ ~ a~. o 0 1 ` n Z win a
m q ~ rn ~ ~ ~ o o- e
C , ~ ~ I PROP 2~~..-: O,~WN °OF ~ ~ ~ ~ l~ ~ ARY ~ ~ - - _ r ~ ; , ~
W m r DR NA EA - L._ _ J ~ ~i ~ ~ i ~ ~ ~ _ _ / ~ - ~ I a- ~ l t ~ aS
' a-~._ _ L _ _ _ . ~ ~ ~ O _ ~ ~ - ~ ~ .M,. ~ ~ . r
- _ _ - ~ ~ / r~ ~(~1~ { w,..:~ _ . ~ ~ e
O O ~ . y ~ 0 1~ ~ ~
_ D~- CQ I--rZ I- ~ ~ a I ~ ~ ~ _JU
~ ~ W ~ ~ _..e_. ° j,_ - ~ - a 5
w O Z 1 ~ o~1 ~N U J 3 <-fir to MO f ~w~}W J ~ O U > ~ ~ L4 w cn a _ I ~ a ~ _ m ro~ ~ ~ , ~ n. . i.
r qS ~ ° I ~W (Y~ZZ ~Z~ r l~Z ,NcO°` ~ F- U`'WWpW
Sf ~ OW 1 Q - ~_,I Q~QW ~QW~ ' Zd'd- Z6~ ~ - ~Z
~O U R f 3 ~ O ~ III II ~~w ~ w O p wQ Z Z~ Z o~ (A W ~ F- W N j ,i ~ ~ O m q ~ ~ ~ O Q~ (n~ xo ~ f--~QI-~ ~ ~ 4~ ~ ,M ~
q <C ~ W ~ Z w ~w wI-O ~ _ dzZQt- . w W f-t- >
U W ~ ` O Z ~ ~ ~ g,w N ~ ~ Oz~rr W ~ I ~ ~ I ` I~ri of ~ II
~ -W ~ O?-(~ ~ ~ ~Qp(L J z q ~ U ~ ~ ~ ~ Q ce ~ a U1 ~ II II ~ ~ 0 € ' 0. ~
q p ~ O I- O Q Iz I Q r? ~ t ~ ~ ~ t ~~~XO~ ~ ° ~ ~ . w ~ ~ E- O ~
W ~ q U Z W ~ ~ Z r~ - l ~ ~ J~.~ p qU ~~W O ? s W~© i; t ~ ~ a~
.q w~g O ~ g~ ~
S ~ ~ ~ W I- I- O W H a ~ X ! , t~::a y
Li.. I W Cn t a I t l~l ~ ~3
_ ~ ~;I~ ~ I ~ ~
OHO ~ JW~W W ~ ~ (l 1 ` ~ W I- _ i ~ ~ ~ ~ ~
W W 1 J O Z ~ N ~ Z ~ .a, tY ~ m~~ q q 0 ~ C~ O U O ~ ~ N W Z N (n r. - ~ ~ ~ d- ~ ~ I~ 1 ~ ~
UO~O Wq q q O Nw m ~ U ~ ~ T I"ql- W~~J ~ v W l I: ,
p ~ W ~ U ~ ~ ~~d- ZJ ~ W ~ Z p ~ ~II~II ~ l~n 0o weHS~~ndH
qq Ztn-I~q~ d' W d' - m ~ U ' II ~ -zgo~w~q ~ ow II to ~ z xoz~ ~
-~q~~~m~vl- q~ O q w Z w w~-_o .~_Yw ~ X
w ~ q ~ ~ J f- ~ m F- C? UI-o~ ~WpWq =rrj II ~LLO II q O ~ ~~~il
q ~ S -1 S Z ~ ..i ~ Z O I.- O a, ~ S J O V- W
W ~ 1- I- ~ O Z d= O ~ ~ Z- ~ W V? Z q ..._T .._T I~~ ~ ~ ~ Town of Cary Project No.: 08-SB-009 p
W O D~ ZW- Zr- U q - - ~ J Q w~0~(n I-W z O v a. o ~ w ~ o~ n.~ _o I
~ ~ U A° .n - _ ~n APPROVED
v1 LL- v~ Wry>W H Jg 2 Ww v
wJJ wQWF- L'jLJ c~V)0 v= o> W -J J :2 -F Q z W l- I- - t1 TOWN OF CARP Approved by Date
~QQ Q ~JCD ~ F- xa xx DEC 1 7 2008 o u Planning Date z Z
~ wz v ZOO Qw QQ 0 ~Nti'w'd-~wz.,, vim : 2 o m: I A . , f j X :D
G.J ~ -WATER flU w I-_ z o Engineering Date .0 OE~~~A,ITY ~O
%ETtimms, AND STORMAIAfCR 5 PH

~ ~ ~ ~'e,. ~ ~1 / % ~ n ~ w, i t ; i ~ ~ ~ 1-
~ , ~ \ i ~ ~
~ ~ Q . , . ~ ~ ~ ~ ~ ~ ~ ~ ~-...w_~ t 19r~00 LF r . , ~ WET PNV~ 446.0 ~ 7 , , ~ ~ ~ ~ ~
t ~ w ~ ~ s . ~ ~ t~ i b i ~ A ~ ~ , u , , ~ ~ ~ ~"'"1 i f~ ~ ~ ~ STORM WATER WETLAND NOTES:
~ ~ - ~ ~ ~ t - ~ ' ~ 18 RCP g ~ ~ ~ , 10'~PVC V 44~-.00~, Q 2.63% t t L , z
t 10 LF ti ~"'~.JE, t I ~ ~ ~ ~ ; ~ I I t . ~ o
~ ~ 10 PVC ~HA~ EL ~P~PER INV 43 00 ~ ~ ~ ~0 ( ~ m ~ o ~ ~ f I 4 i 3 -y, . , ~ I PO~JL 1. THE WETLANDS MUST BE STABILIZED WITHIN 14 DAYS OF
°r. ar i ~ e ~ ~ ~ t I I ~ it ®20.0 d ~ ~ ~ L ~ ~ ~ ~e. ~ ly t ~ a z~ i ~ f i ; ~ ~ ~ `4 ~ ~ CONSTRUCTION. STABILIZATION MAY BE IN THE FORM OF FINAL ~ ~ W
~ ~ f' a 1~°O b,PVC ~ ~ ~ 1 EX PpND ~ t i ~ , ~ \ 3 ~ ~ I I ~ 3 { , ~ < k, ~ aQ I ~ VEGETATION PLANTINGS OR A TEMPORARY MEANS UNTIL VEGETATION ~ ~ o
INV 44~. ~ ` t 1 ~ , `BYPASS CHANNEL 1 1 ~ ~ ~ it'
~ ~ ~ ~ ' ~ , ~ ~ ~ ~ BECOMES ESTABLISHED. ~ ~ w
~ F~REB 't ~ ~ z - ~ 3. SOILS TO BE VERIFIED FOR SUITABILITY. BASIN TO BE CONSTRUCTED ~ < ~ f 3 USING A SUITABLE STRUCTURAL FILL MATERIAL. APPLY A ROOTING " "
~ ~ tt i ; ~ i r ~ l n. l ~ ~ ~ f (e ~ ~ \ . i . ~ aw ~ . i
SHALLOW VAT R r~`~ t ) ~ ~ , , ~t OUT~:ET ~TRUCTURkE ; ~ , ~ I , I . ' ~ . F rr./ "'C .4.29 P` l Y 1 ~ ~ l}1 I I 7 ~ I
1 ~ l ~ ~ r r ~ ~ , , ~ 8~ GRATA INF 443.7 FES 11 ~ ~ r ~ #F ~ ~ . ~ ~ ~ 1 i t ~ I 9 1 ~ a ~ . ~ 2 Y> ~ ) ~UTL ZONE OF 6 TO 12 INCHES OF TOP SOIL EXCEPT IN AREAS THAT WILL ~ ~ ET ,~TRUCTURE #2 ~
~ ~ ~ ~ ~ ~ ~ ~ ; ° ~2 ORIFICE INV 43.00 ~ INV 439.50 s r ~ ~ SHALLOW!LAN ~ ~ ~ t . , ~ } ~ x'48" ?GRA E INV 443.65 BE COVERED BY THE PERMANENT POOL N o 0
r ~ ~ _ ~ 1~~ RCP INV 439.00, , e ~ ~ t i ~ ~ t ~ ~ t ; ~ + ~1" ORIFICE IN1~ 443.00 4. ALL CONSTRUCTION, MONITORING, AND MAINTENANCE GUIDELINES IN d
}i , 1 ~ ( I t ~ i, ~ ~ a ~ ~ t a" i ~ i t ~ , ~ , s ~ ~ ti ~ s 3 ~ / r ~ ~ ~ ~ i 18" FRCP `INV 440.00 THE NCDWQ STORMWATER BMP MANUAL MUST BE ADHERED TO. " ~ z
t 1 t 1 ` ~ r l4r ,I ` t y ~ ~ s, ~ P D~ L l ~ E1~ ~ti ~ ` ~ t ~ ~ , I S;HALLW
~ t ~ ~ E ~ ~ ~ t I ~ a ~ ~ ~ ~ , ~.,j ~ ~ ~ ~ i ~ fj LAND ` ,,,ff~~~ff,f,,,,
l ~ ( i f ~ ~ ~ a ~ j t~ I P ~ i~ ~ f ~ ~ i 1 I ~ I t ~ ~ , ~ , ~ SPILLWAY #2 I ~
r.. r t II ~ STORM ATER WETLAND ~Q
t / ~ i ~ ~ ~ I f SALLOW ~ ` ~ o -
,1 ~ ~ % ~ E ( I ~ ,r r f W~TER - ~ 8 3 I
~ a \ ~ r ~ i E ~ ~ ~ f . o- , ~ I OPERATION AND MAINTENANCE. = e,:
( f` ' ~ ~ ~ w~ 1 ~ t ~ i 1 ~ ( ro. a~ i i it 1 1 °rj l ~ r ~ r 't ~ ~ i it ~r i
~ ~ ~ ~ ~ , 'b ' t ' x ~ ~ ~ CHANNEL:` UPPER INV 4.43.00 I ~ ! <<~,ff~~~ff~~~ ' ~ ~f
~E ~ ~ w _ . ~ / , ~ ~ ~ DAYLI~G. T, GI~ANN~L ~ ~ ~ ~ ~ I << ~ I ~ RIP~AP DISSI~'ATER OPERATION: ~
~ ~ ~ ~ ~ "A~T~EL'~~~ 4 .00'° ~ I ~ BYPASS ,CHANNEL #2 , , f ~ ~ J E ~ ~ . ~ l _ ~ 1 ~ : ~ t' ' ~ ~ ~ i s t i t 1 i i~ t f t ~ i
f~ ~ rt d ~ ~ ~ (i ~ r~ ~ 28.00 LF ~ L: ti~ ~ ~ t > > , . 1 I ~ I ~ ~ ~ , ~ . ti ; ~ ~ I i tI 1 ' o ~ ~ 3 UUIDE,~ 3 LONG p
~ , ~ ~ 0~ - ~ ~ , ~"RI~PRAP~ DISSIPA ER I , I ~x °I ~ ~ ~ ' 3" ?CLASS A (STONE ~ 1. ASSESS AND DOCUMENT PLANT COVER PERIODICALLY.
V I.. ~ t~ 1 e\ d ~ ~ 7 WIDE 7 LONG ,,Ix 9"! THICK ~ ~
a ~ ! ~ f~ , ~ ~ ~ ~ '1 \ t~. ~ ~ ~C.LASS B 'STONE ~ I ~ , ~ t, ~ ~ ! 2. MONITOR VEGETATION. ~ ~ ~ f 8 ~VC 3. INSPECT WETLANDS MONTHLY AND AFTER STORMS PRODUCING 1.0
! ~ t t a ~i ~ f ~ FES #5 ~ ~ ~ ~ ~s ~ ~ ~ z t~^ ~ n ~E z f : / ~ v t ' ; INV;441.50 ~
P ~ ? l ~ , , ~ 22 THICK; i ~ ~ ~ r T t INV 438.50 1 ~ ~ ~ 1.0 LF ' ~ INCH OF RUNOFF OR MORE. ® ~ N
F > r' ~ SPIL WAY 1 ~ ~z~, ~ ~ ! i r l ~ r ~ ~ ~ f 1, 1' ' D~tYI GH G ~ CFIANNEL- ~ ~ ~ PVC ~ 4. DURING INSPECTION, OBSERVE THE FOLLOWING: ~ N ~ ~ ,4
i ~ ~ r~ ~ ~ C ~ i 1 iii' r~'~,, r 1 , E ~ \,ti ~ ~ I ~ . ~ I ~ ~ ~ / ~ RIPRA'P DISSIPATER ~ ~ ~ ~ AT 440.0- , ~ ~ , 5~0~~,~ j~ T~-- -CLOGGING OF THE OUTLET OR VERY RAPID WATER RELEASE ~ ~ N N
z i ` ~ ~ r t ~ ~ rr ~ ~ ~ ~ t E d ~ janr, ~ l~1 ~ ~ ~r t+ ~ ~ , 1 ~ . . IDE~~ 12 LONG ~ ~ ,~~a~.I ,,l s~,, r , ! ~
, s tr ti , 3PS ~ ' ~ ~ i - _ -APPEARANCE OF INVASIVE SPECIES OR DEVELOPMENT OF ~ ~ o
t . ~ ~ EX PON 6 CLASS B STONE t ~ ~ 1 ~ TO° .00 I .00 ~ 1
~ ~ ~ ~ I ~ ~ ' r 22 THICK ~ ~ ~ 4 EIR IN` ~ EI[~ IN~~4 4.00 MONOCULTURE ~ U o~ o -EROSION ON THE WETLAND BANKS ~ a
8" PVC INV 3" PVC INV 442.00 ~ ~ ~ ~ ~ •v -EROSION AT INLET AND OUTLET
PLAN -SEDIMENT ACCUMULATION ~ w ~ z
LE: 1 SCALE: 1" = 20 " = 20' SCA -DAMAGE TO, OR BLOCKAGE OF, THE EMERGENCY SPILLWAY ~ ~ o ~ c
-WOODY VEGETATION IN THE EMBANKMENT OR DAM •y v,
5. INSPECT EBANKMENTS AND HYDRAULIC CONTROL STRUCTURES ~ a
BYPASS CHANNE' TOP aF BANK ELEV a4a.5o REGULARLY AND IMMEDIATELY AFTER ANY UNUSUALLY HIGH FLOW ~
70P OF BANK ELEV 444,50 TOP OF
~„LETSTRUCTURER~ LINING =NORTH AMERICAN GREEN P300 MAT DDTLETSTRUGTURE92 2" DIA, WtIFlCE 1" DIA. OIBFlCE 48" GRATE EVENTS. SPILLWAY ELEV 444.00 6. CORRECT DAMAGE, EROSION, OR BLOCKAGE AS SOON AS POSSIBLE. ~
INV 443.00 IN 443A,7g SPILLWAY ELEY 444.00 SIDE SLOPE _ 1 INV 443.00 INV 443.65 J UNED WITH 9" PoPRAP d OV LINED WITH 12" RIPRAP OVER X57 STONE
OVER X57 STONE BOTTOM WIDTH 0 FT E ' w P TEMPORARY POOL y~' TEMPORARY POOL b~' __EL_443.98_,,, ~w a P7 a
.w-~~-~....--~- MAX CHANNEL SLOPE = 0.133 FT/FT ....__w..m. _ . PERMANENT POOL SHALLOW LAND
PERMANENT POOL SHALLOW LAND DEPTH = 1.00 FT EL 443,00 EL 4430D~ ~ . w.~~ A ~ r_ ~ MAINTENANCE: 'y~~
r> s~aLLOw w ~ - _ e" . . I SHALLOW wad p I _ . ~ To"I ~~--,m,~». m~~~ MAX DESIGN FLOW - 7.94 CFS (10 YR EVENT) INV~N44 200 FOREBAY VIN 442.00 FOREBAY DEEP ~ ~
DISSIPATER: DEEP MAX VELOCITY = 7.662 FPS DIS57PATER; , Pool 4s" RCP RISER
T MADE, T LONG POOL 48 RCP RISER 3' CLASS A STONE WATER TABLE T3' CLASS B OR 1 STONE WAIER„„Tf~BLE _ , e" THICK ~ " . , _ - 1. ALL STORMWATER WETLANDS TO BE MAINTAINED BY THE ~
22" THICK ' DISS6~ATFJt: 5' WIDE, 5' LONG DISSIPATER: HOMEOWNERS ASSOCIATION. ~ ~ I 9' WWE, 9' LONG
3"CLASS A STONE 9" THICK ,CLASS B STONE 2. THE OPERATOR SHOULD UNDERSTAND THE BIOLOGICAL REQUIREMENTS
ig 2813"R X18"RCP® OF THE PLANTS AND MANAGE WATER LEVELS TO PROVIDE FOR THEIR
q ®1.7gX 2.8~ ~e r ~ NEEDS.
LINING = 9 RIPRAP OVER 57 STONE
INV 439,Q0 NV 440.00 SIDE SLOPE = 2:1 3. SEDIMENT TO BE SELECTIVELY REMOVED AFTER 6 INCHES OF
~ BOTTOM WIDTH = 10 FT so" x so• x 12" IN~v 4~.'T'9.So 80" X 60" X 12" INY 438.50 INY 439.50 ACCUMULATION (USUALLY EVERY 5 TO 10 YEARS) SO AS NOT TO (DISCHARGE INTO E% POND)
CONCRETE FOOTING (DISCHARGE INTO EX POND) CONCRETE FOOLING (DISCHARGE INTO EX MAX CHANNEL SLOPE = 0.240 FT/FT CAST RISER INTO CONCRETE CAST RISER INTO CONCRETE DISTURB PLANT GROWTH. o
DEPTH = 0.50 FT 4. DEBRIS TO BE REMOVED WHENEVER THERE IS ACCUMULATION OR AT ~
r~ _ .71 CFS 100-YR EVENT\\ MAX DESIGN FLOW 4 ~ J 1, 1 ORIFICE TO HAVE PVC TURN-DOWN. SEE DETAIL SHEET D5.
1. 2" ORIFCE TO~ATMIS LOCATIONDIS 8" BEOWEE%ISTINGEGROUND AND WILL VELOCITY 3.049 FPS 2. WATER TABLE IN THIS LOCATION IS 6" BELOW EXISTING GROUND AND YALL 2. WATER TABLE MAX ID PALL LEAST TWICE ANNUALLY.
PROVIDE FOR THE REQUIREMENT THAT THE DEEP POOLS BE AT LEAST 8" PROVIDE FOR THE REQUIREMENT 1HAT THE DEEP POOLS BE AT LEAST 8" BELOW THE WATER TABLE. BELOW THE WATER TABLE. e" 5. A DAM SAFETY EXPERT SHALL INSPECT THE POND ANNUALLY.
)SS SECTION PLANTING,~SEEDING:
NO SCALE NO SCALE 1. IMMEDIATELY AFTER THE WETLAND IS ESTABLISHED, THE PLANTS
SHOULD BE WATERED TWICE WEEKLY IF NEEDED UNTIL THE PLANTS
BECOME ESTABLISHED.
2. NO PORTION OF THE WETLAND SHOULD BE FERTILIZED AFTER THE ~
PLANTING LEGEND INITIAL FERTILIZATION THAT IS REQUIRED TO ESTABLISH THE WETLAND ,C
PLANTS. '
U ~
COMMON NAME MINIMUM SPACING J V
TITIY SCIENTIFIC NAME COMMON NAME MINIMUM SPACING SYMBOL QUANTITIY SCIENTIFIC NAME COMM SYMBOL QUAN .C
TREES ~ 4 TAXODIUM DISTICHUM BALD BALD CYPRESS 20' O.C. 6YPASS CHANNEL ~2 ~
TREES 6 TAXODIUM DISTICHUM BALD CYPRESS 20 O.C.
""y ' p' r.~'~.,
VIBURNUM NUDUM POSSUMHAW VIBURNUM 4 O.C. SHRUBS ~ . 3 VIBURNUM NUDUM POSSI SHRUBS 5 ~ ' POSSUMHAW VIBURNUM 4' O.C. LINING =NORTH AMERICAN GREEN C35O MAT ~ SIDE SLOPE = 3:1
6 ITEA VIRGINICA VIRGINIA SWEETSPIRE 4' O.C. 4 ITEA VIRGINICA VIRGIN VIRGINIA SWEETSPIRE 4' O.C. BOTTOM WIDTH = 0 FT ~ MAX CHANNEL SLOPE = 0.364 FT/FT
DEPTH = 1.00 FT
ALNUS SERULATA HAZEL ALDER 4 O.C. 4 ALNUS SERULATA HAZEL 6 HAZEL ALDER 4' O.C. MAX DESIGN FLOW = 2.87 GFS (10-YR EVENT) ~
CREEPING BLUEBERRY 4' O.C. ~ 4 VACCINIUM CRASSIFOLIUM CREEF 5 VACCINIUM CRASSIFOLIUM ~ CREEPING BLUEBERRY 4' O.C. MAX VELOCITY = 8.724 FPS ~ ~
» E 12 O.C. HERBACEOUS 7 CAREX STRICTA UPRIG P I HT SEDG UPRIGHT SEDGE 12" O.C. ~
HERBACEOUS 11 CAREX STRICTA U R G
ROSE MALLOW 12" O.C. LINING = 12" RIPRAP OVER #57 STONE L
HIBISCUS MOSCHEUTUS ROSE MALLOW 12 O.C. 8 HIBISCUS MOSCHEUTUS ROSE 11 SIDE SLOPE = 2:1 ~
SPIDER LILY 12" O.C. BOTTOM WIDTH = 20 FT U
" 8 HYMENOCALLIS EULAE SPIDE 11 HYMENOCALLIS EULAE SPIDER LILY 12 O.C. MAX CHANNEL SLOPE = 0.385 FT/FT
" 8 JUNCOS EFFUSUS SOFTF 14 JUNCOS EFFUSUS SOFTRUSH 12 0 C EMERGENT EMERGENT SOFTRUSH 12" O.C. DEPTH = 0.50 FT MAX DESIGN FLOW = 14.50 CFS (100-YR EVENT)
" LATIFOLIA DUCK 16 SAGITTARIA LATIFOLIA DUCK POTATO 24 O.C. 8 SAGITTARIA DUCK POTATO 24" O.C. MAX VELOCITY = 4.193. FPS
Town of Cary Project No.: 08-SB-009 p
NOTES: NOTES:
~ urpQnr~nl Ic pI onirc m R~ ~~ini a_ir\ir.N r.nniTA~NFR 1. HERBACEOUS PLANTS TO BE MIN 4-INCH CONTAINEI CONTAINER. APPROVED
0 7- R. D 9@00mgm TOWN OF CARY
2. SHRUBS~TOJBE~MIN 1-GALLON CONTAINER.-- ~ 2. SHRUBS TO BE MIN 1-GALLON CONTAINER.
3. TREES TO BE MIN 2.5° CAL. BARE ROOT OR B&B. 3. TREES TO BE MIN 2.5° CAL. BARE ROOT OR B&B. OR B&B. ? Approved by Date d
4. PLANT CENTIPEDE GRASS AS 10-FT BUFFER AROUND WETLAND. 4. PLANT CENTIPEDE GRASS AS 10-FT BUFFER AROUN -ER AROUND WETLAND. Planning Date Z Z DEC 7 20~J$ Engineering Date 0 3
DENR. WATER QuALiTY
KETLANDSAt~DgpDR~WAI[' us

I T R , ~ ~ , t , RIPRAPE DISSIPA ~ - ~-s-~'~ ~ ~ ~ ~ r t t ~ ~ ~ ~ ro~ , i r ~ ~
1 i r r ~ r ~ a i ~ ~ t _ t / i' r A ~ I ~ 12 `LON'G 1 WIDE ~ ~ ~ ~ ~ ; ~ ~ .r~ ~ ~ WET DETENTION POND ~ ~ m
6 CLASS B ° TOf~~ f~ ~ f ~~r , ~ ~
~ ~ I 22 'THICK ~ I ~ I ~ ~ ~ I ~ r ~ ' ~ t , ~ OPERATIONS AND MAINTENANCE PLAN: z
! ~ t ~ E I €I '1^ I~ t:; ~ ~ ~ l ~ b~ l s 1 3 l i r'
i , . i t r t E i r i a ~ OPERATION: ~
' { I I J I 4 _ -.__L_,_ ~ ~ 1 - - . 3 , r~`" lr , t tt~~ ~ t fF r ~ r ~ ~
.,f ! E ~ 1 1 ~ p I ~ 0
i ' ~ r ~ THE POND .WILL BE INSPECTED MONTHLY AND AFTER STORMS PRODUCING 1.0 INCH OR MORE OF ~ ~ o
~ ( z~ SHALLOW LAD ~ ~t ~ . , ~ t~ ~ ~ I , ; ~ f ~ ~ I ~ / ~ ~ t~ , FES ~ ~ ~ E 3 t r i ~ [ l ~ ~ ~ ~ ~ Tt ~ ~ ~ V ~r`~5'''~ ~ RUNOFF TO VERIFY IF THE FACILITY lS OPERATING AS DESIGNED AND TO SCHEDULE ANY ~ ~
~ ~ I ~ ~ r f r ! ~ of ~ s < i ~ ~ ,r ~,~y~_,~ ~ ~ , ; f!~` ~ ! r~ ~ ~ ~ ~/j ~ ~ ~ EX SPh LWAY INV 438.5.0 ; ~ n, ~ REQUIRED MAINTENANCE. THE FOLLOWING ITEMS WILL BE INCLUDED IN THE INSPECTION: } ~
j ~ ~ e t f i f r j i~ %'f?llj, 1 J~ ~ ~ i E ~ ~ ! ~ i a l,~< ~I`~ 1 1 I ~ ~ t[ an ~ ~ , , ~ I 3 ,1 ~ ~ TO BE ~ILLED _ t~.~~.~ t;11~i1~ + ~ v
~ ~ / , E~~REBA~,~~ f ,l r t ~ ° . I ~ ~ ,f~ t ~ ~ i ~ ~ ~ I 4~ ~ t ' t f ~ t ~ ~ ~ ~ % ~ - ~ ~ r.~E ;~;r;,n , -INSECT PLANTINGS
SHALLOW WATER ~ r ~ _ ,~„~r',1. ;ry±~~ -EMBANKMENT SETTLING, WOODY GROWTH, ANIMAL BURROWING, AND SIGNS OF PIPING ~ m ~
t } t „ ~ J l~f~' iz E r' I `'~w ( j I1_a• d~ ~ 1 ~ ( ~+St:i ( ~ 1~. ~ O N Q ys~~.,~ -SIGNS OF SEEPAGE OR PIPING ON THE DOWNSTREAM FACE OF THE EMBANKMENT ~ ^ °
! r r 1 t~ i ~ ! ~ 2 f 1 f ! ~ ~ fi L..,~( 1. t ~ 2 , t - -CONDITION OF GRASS ON THE EMBANKMENT, BASIN FLOOR, AND PERIMETER OF BASIN
~ t ' I t ~ ' ~ i ~l., f 1 1 ~ ~ ~ r ~ 1 I ~ ~ ~ 3~ l I f . ~ i, ~ ~ ~ 1 i ~ ,R ~ t ~ it ~ J r ~ ~ z ~ I~, 1 ~ ~ ~ Fsy . ~ n ` ~ -EXCESSIVE EROSION OR SEDIMENTATION IN OR AROUND THE BASIN " ^ z
~~a ~ i ' r` ~ ~ f` 3~ FES` 12i ~ ~ ~;t = ~ ~ 1' 1 ~ t ~ ~ ~~fi ~ t ~ r r < r' I t ~ ~ . # J t l1 ~z t E , ; ~ , pl Q I ~ i i r.. / t' ~ 1 i i ~ ' J~ f 1 f ( t ~ oI I~ir~ ; ~ ~ -RIPRAP DISPLACEMENT OR FAILURE
~ i ~ INV 49.00' fl ' ( 1'=t ~=t r ~ I ~ i°i ~ 11~'~E I -PRINCIPAL OR EMERGENCY SPILLWAY TO MEET DESIGN PLANS FOR OPERATION
DEEP POOL" ~ ~ ~ ~ r r ~ ,~',r` i ;l I , I f ~ ~ ~ , 1 , r ~ ~ 1 : 3 r t ; ~ t ~ t , ,v-~ ~ ~ ~ I ~ ~ t 0 SPILLWAY ~ 7/x!4 i ~ F ! ~ I f ~ fr ~ } f 1 fI ~ P !I t .i I ti, _ ~ I r ~ ~ ; i " CHECK r~ ~ ~ ~ , ~ ; F , ~ ~ ; s -OUTLET CONTROLS AND INLET CONTROLS \\,,oG~p,~ES,° I NCB"'~;,
r ~ , ~ ~ _ ~ ~ OUT STRI~CTUR~. 3 1 .<~-t t r ' ~ i 1 r ' -STABILITY OF SLOPES : r ~
' ~ i ' ~ , ~ r DAMS i , f, f ! f ~ ~ , ; ~ ~ s t _ t ,2,4: ,~RATE,INV 43~. 0; ~ ~ - ~,,f, f r~ ; ~fL~WER INV 429.00 ~ ~ E ~ ';t. 28.0,0 LF I ~ ~ r,! ~ ~ r I ~ , a , , 1 ~ ? ~ ~ ~ , 1 t~ BERM r: , t< ~ ~ • ~ ti s ~ ~ ~ ~ t{ -SAFETY FEATURES ~
~ ; 4 f' , ~ t ~ t , ~ , ~r f ~ 1 ~ ~#~I~'IC~~ INV 300, ; ~ ~ ; & , . f GRADE @ ONSTANT 1;7~ ~ ~ , : ~ 15 RCP f' r ~ s ~ r ~ t ~ ; , r ~ ~ ~ . -ACCESS FOR MAINTENANCE EQUIPMENT o~ ~ -
! ~ ~ I i l ~ ~ k 1.79% ~ I l 1-'5~ E~CP ~N~ 429.0 ~ , i ~ [ ; I ~ ! II ~ , . ~ r' -t"z ~ i . c -CLOGGING OF THE OUTFLOW PIPE ~0'e• » _
I ~ ~ s ~ ~ r= ; - 423.37 ~ ~ ~ ~ ~ ~ ~ ~ ~ -SEDIMENT ACCUMULATION
ti j f S ( r` t` i d ~ 0 ~ ~ , , i ~ ~ t r ~ t~ , ~ - ~ ~ ~ DREDGE POND T , , I
t .I ~ s, 418.07 ~ 1 ~ E ~ ~ ~I ~ E~ ES 12: __.J ~ ~ ~ ~ ~ ~ ; 3 v t r ~ ~ , ; ~ ~ SF~IFT CONTOURS ~ ~ ~ ~ -~z, MAINTENANCE:
t ~ ( fi ~ ~ INV; 429.00 ~ . ~ ~ ~ ~ , „ t t 1"~•" ~ I c~
t ~ ~ ~ ~ rl ~ s ~ ~ ~ I ; ~ i ~ 1 d ~ ; R'~~M~VE E E ~ ~ I~~ ~ ! I - z - ' I_ ~ ~ 1. THE WET DETENTION POND IS TO BE MAINTAINED BY THE HOMEOWNERS ASSOCIATION.
t ~ ~ , ~ S,P.Y WAY ~ ~ ~ ~ _ ~ ~ ~ , t ~ ~ ~ ~ i ~ ~ ~ E X ~ ~ I r t , ; ~ °OUTLET ~ i ~ ~~~,1 : ~ 2. CHECK DEBRIS/LITTER AT INLETS AND OUTLETS AFTER EVERY STORM PRODUCING RUNOFF. ~
~ r t f r ~ l ~ f Q i r { i~ I f ~ ~l ~ z I ~ ' ~ ~ : ~ ~ v,- ~ i,.. HECK ~ ~ ~ t ~ ~ i ~ ~ ~ x ; t t` ~ r ~A D PI PE ~ i , 1 i jf f' i r ~ I ~ t ? ~ 7 fi ' i ! ~ 1 t } ''~'C~z ~ I t r ~ ~ ~ ~ f ~ 3. ROUTINE VEGETATION MANAGEMENT/MOWING. ~
f ~ ~ ~ ~ r A m i~ ~ ;zi , ~ 1 ~ ~ f E DAM I ~ ~ ~ ~ ' ~ ~ f ~ ~ mf ~ ~E~ ~3 ~ ~ ~ 1 ~ , ! I I1 ~ ~ ~ ~ 4. MONTHLY OR AFTER STORMS PRODUCING 1.0 INCH OR MORE OF RUNOFF: ~
t ~ ~ t , ~ i~ I i f r j~ a ~ 0 1 j ~~a. -SEDIMENT BUILDUP AND THE NEED FOR REMOVAL
- ~ „ fir r 1 ~ t ~ ~ t I ~ ! II 1 1 ~ ~ i + , j s X~POFD ~ ,
( I t ~ r` ~ 3 ~ I t t 3 i / j? 1~ t J 7 8- t ~ i ~ ~ I'' If r 1 ~ ~ ~ If ~ 1 ~ _ ~1 ~ ~ ~f ~ , ; , ~ ~ ~ ~ , ~ ,--~--ti ~ ~ -EROSION ALONG THE BANK AND THE NEED FOR RESEEDING OR STABILIZATION 0 ~ N
~ ~ t I;r. ~ ~ l ~ -EROSION AT THE INLETS AND OUTLETS ~ N ~ o
i I It. / ~ ~ ~:~I I ~ ~ 1: ; O t l,. , r l , ~ ; , I . ; -SEEPAGE THROUGH THE EMBANKMENT ~ ~ ; N N
f i _ . ~ , l , z ~ ~ FES 11 [ I a rr ~ ~ 1 1 I I ri ~ ~ ~ I f \ . t i f I ; r 4 : , ' ~ ( ~ ~ I N`V 438.50 5. THE FOLLOWNG PREVENTATIVE MAINTENANCE: ~ ~ ~
e~ d ~ << J ~ r i~ r r 4 f f I _ ~ -GRASS MAINTENANCE o rn B
- ~ry_ ''Is;~~i 1 'r ~ ~ ~ ~ ~ 1 ~I ' a ~ 3 -CONTROL OF WEEDS AND INVASIVE SPECIES ~ ~
'`t}fIr r ij tt ~~f f 1 r` ~ L ~ -MAINTENANCE OF WETLAND VEGETATION ~ a
f ,r ~ ~ - ~ ~ OUTLET ST' UGTU;RE~ 4_- I -REMOVAL AND DISPOSAL OF TRASH AND DEBRIS r l fir/ ~ ~ ~ U
- ~ ~ ~ ~ ~ ~ r ~ 1 ~ ~ 0~~ ~l ~J S E s , GR ~ I v .440.00 )1 I . -REMOVAL AND DISPOSAL OF SEDIMENT ~ z o ~
4 ORIFICE ',INV 439.00 i ; SCALE: 1 = 20 RI~~~~~ ~ ~ F ~ j -ELIMINATION OF MOSIQUITO BREEDING HABITATS ~ w
( ~ ~ 0 ~ ' ~ ~ 4 . C~' INV 431.00 , I ~ j -INSPECTION OF WET DETENTION BASIN AND REPORTING OF RESULTS ~ c o N
~a j ~ ~ -MAINTENANCE OF ACCESS ~ .N ~ ~ ° °
i ~ t II! j I ~ ~ 6. ADAM SAFETY EXPERT SHALL INSPECT THE POND ANNUALLY. ~ o ~ ~ a ~~rn
O~``.. ~ ~ s ~ ~ 1 a ~"'1~ ! _ i. ~ ~ .r ~ t ~ ~ t~ i ti ~
, TOP OF BANK ELEV 434.00 ~ ~ w i t I t ! j ' ~ . i ~ ~ _ ~ PLANTING/SEEDING: ~ w ,
~ ~`'r. ~ i i ~ ~ ,E ~ , OUTLET STRUCTURE. + ~ ~#q } ~~t \ f ~,i r f ~ r-
1' DIA, ORIFlCE 24" ORATE ~ ~ ~ 1", A.~ ~ y, t ~ ~ : ~f . t t INV 432.00 INV 433.00 SPILLWAY ELE~ 433.50 ~ ~ ~ . ~ I ~ ~ 1. SEED EMBANKMENT AND SIDE SLOPES ACCORDING TO SEEDING SCHEDULE ON SHEET C4.
J tJNED WI1H 9 RIPRAP _...e' t o~ l 3 ' ~ ~ ~ OVER (Ci7 STONE ~ , . ~ . A. ~ ~ , ~ ~ r y ~ . ~ ~ ~Mi
~ • TEMPORARY POOL ~ (MEET POND SPILLWAY} ,_r ~ ~ ti ~ ,t ~ c, [ I ~ ~ ~ ~ f s ~ r I . !j ' ,m~. ,.,w,
, . PERMANENT POOL SHALLOW LAND ~ ^ ~z
x, i ! EL 43200 " I SHA I LLOW W R f A, / `I` ~ f ~ ~
, ~ ~ Fez INV IN FOREBAY ~ ~ j(- ,,i ~ I
DEEP ~ ~ ~ ' ~ ~ ~ ~ DISS~ATEh" POOL 48' RCP RISER ~ ~ ~ ' ~ f ~ 1 V ~ t i 'LONG 12' WI 2 DE, ,E WET DETENTION POND NOTES: ~ ~f~A
~w 6" CLASS B STONE :WATER TABLE / ~ ~ - ~ . ~ ~ 22" THICK DISSIPATER: ~ / ' ~ ~ 3 ® X09
5 bYIDE b' LONG ~ f~" ~ ~ ~ ~ r~'~ . 5 E ~ , - ` 3" GLASS A STONE " ° ~ ~
~ 9 THICK ~ u M.. z ~ AV~ ~ ~ - ~ _ 1. SIDE SLOPES TO BE NO GREATER THAN 3:1. `"I ~ ~
. ~ 18 ~ t " ..e r ~ ~ . _ _ ~ d' RCP ®t.IBZ r' „ . ~ i~ + 11 ~ ~ ~ ~ _ ~ ~ , j ~ 2. PROTECTION TO BE PROVIDED AT THE OUTLET AND INLET STRUCTURES.
~~l~ 3. REINFORCED CONCRETE TO BE USED FOR ALL PIPE.
INV 428.50 4. THE RISER TO HAVE TRASH RACKS, ANIT-FLOTATION DEVICES, AND ANTI-VORTEX DEVICES.
FES /12 5. MAINTENANCE ACCESS TO BE PROVIDED.
80" X 50" X 12" INV 429.00 CONCRETE FOOnNG (MEET POND SPILLWA>i 6. VERTICAL SEDIMENT DEPTH MARKERS TO BE INSTALLED. o
CAST PoSER INTO CgVCRETE SCALE: 1" = 30' 7. THE WET DETENTION POND MUST BE STABILIZED WITHIN 14 DAYS OF CONSTRUCTION. ~
STABILIZATION MAY BE IN THE FORM OF FINAL VEGETATION PLANTINGS OR A TEMPORARY MEANS
T. 1" ORIFlCE TO HAVE PVC TURN-DOWN. SEE DETAIL SHEET D5. UNTIL VEGETATION BECOMES ESTABLISHED.
2. 24" GRATE ON 48" RISER STRUCIURE• TRASH RACK 3• WATER TABLE IN THIS LOCATION IS AT IXISTING GROUND AND WILL 8. ALL CONSTRUCTION, MONITORING, AND MAINTENANCE GUIDELINES IN THE NCDENR STORMWATER
PROVIDE FOR THE REQUIREMENT THAT THE DEEP POOLS BE AT LEAST 8" PROP 48' OIA. CONCRETE BELOW THE WATER TABLE. RISER STRUCTURE BMP MANUAL MUST BE ADHERED T0.
9. DAM TO BE RE-CONSTRUCTED WHERE BREACHED USING A SUITABLE STRUCTURAL FILL
OU11ET STRUCTURE ~4 TOP OF DAM ELEV 443.00 48" DIA, FRAME AND GRATE MATERIAL. AS A LINER, APPLY OVER THE ENTIRE DAM FACE APPRQXIMATELY 6 TO 12 INCHES
PROP SPILLWAY, ELEV 441.00 _ , LINED iNTH 24" RIPRAP OVER OF LOAMY OR CLAY SOIL (MINIMUM 15 PERCENT PASSING THE X200 SIEVE AND A MAXIMUM
~'i7 S10tTE AND FlLTER FABRIC PERMEABILITY OF 1 X 10"-5 CM/SEC).
NO SCALE P WATER QUALITY OOI, ~ _ ~
EX BOTTOM ELEVAnON VARIES I PERMANENT POS.,, ,MAX DEPTH APPROJ(4Jt•OQ, 0 _ , EX DAM
f
",w,. p Rpp ses~ G
?4 RCp DISSIPATER:
p~P T2' WIDE, 12' LONG F ® 8" CLASS B STONE L•4~ ,."....,.r 22" THICK ~oec ° ~ U STONE \d
i 1 ea~U
8D"X80"X18" 30"X30'%4' ' SYMBOL QUANTITIY SCIENTIFIC NAME COMMON NAME MINIMUM SPACING coNCRETE FoonNc CONCRETE ANn- ~ ~3 0 i
CAST RISER INTO CONCRETE Sip CDI.IAR INV 430.00 ~ Y/
TREES a 3 TAXODIUM DISTICHUM BALD CYPRESS 20' O.C.
pp
VIBURNUM NUDUM POSSUMHAW VIBURNUM 4' O.C. ° ~ ~
SHRUBS 2 . F
> NO SCALE
3 ITEA VIRGINICA VIRGINIA SWEETSPIRE 4 O.C. (~'U
3 ALNUS SERULATA HAZEL ALDER 4' O.C. t~
• 3 VACCINIUM CRASSIFOLIUM CREEPING BLUEBERRY 4' O.G. ~~3
HERBACEOUS 6 CAREX STRICTA UPRIGHT SEDGE 12" O.C.
G~
» ~ 5 HIBISCUS MOSCHEUTUS ROSE MALLOW 12 O.C. U
LINING = 9" RIPRAP OVER #57 STONE LINING = 24" RIPRAP OVER #57 STON 5 HYMENOCALLIS EULAE SPIDER LILY 12 O.C. #57 STONE AND FILTER FABRIC
SIDE SLOPE = 2:1 SIDE SLOPE = 2:1
» BOTTOM WIDTH = 10 FT BOTTOM WIDTH = 10 FT 7 JUNCOS EFFUSUS SOFTRUSH 12 O.C.
EMERGENT MAX CHANNEL SLOPE = 0.158 FT FT MAX CHANNEL SLOPE = 0..17 FT FT ~ ~ 17 FT/FT
» DEPTH = 0.50 FT DEPTH = 1.00 FT
7 SAGITTARIA LATIFOLIA DUCK POTATO 24 O.C. MAX DESIGN FLOW = 8.21 CFS (100-YR EVENT) MAX DESIGN FLOW = 100 CFS (100-YI FS (100-YR EVENT) ~ '
MAX VELOCITY = 3.264 FPS MAX VELOCITY = 5.993 FPS Town of Cary Project No.: 08-SB-009
_ ®ppRnvFn
NOTES: ~T) R(
1. HERBACEOUS PLANTS TO BE MIN 4-INCH CONTAINER. TOWN OF CARY l`A Approved by Date
2. SHRUBS TO BE MIN 1-GALLON CONTAINER.
3. TREES TO BE MIN 2.5" CAL. BARE ROOT OR B&B. DEC I i 2005 Planning Date z Z
4. PLANT CENTIPEDE GRASS AS 10-FT BUFFER AROUND WETLAND. Engineering Date
VVERANDSanonSTORM gEaapa ce