20091226 Ver 1_Minor Variance_20091113

Southwest Elevation
5'-0" 8"flood depth •
n Plan
ao
3g nje P P level Spreader ° I I ieV ip5preaae outlet levels reader I r h r
I I p ~ out et St etc e (see inset) level Spreader [dance:
•
x 10' Basin
interior ~/7~ Imenslons dOWnspOUt
I I °''i~ •
~e~ ~p °t85 ~ a~'er ~9~ ~S r'h~e 5~ typre inlet rowlock h Pea t 38 f`e~e
der ~1 ~,op ° levels reader downspout outlet 22'-5° p iI Drive
to inlet level Spreader
(See inset) ~
® L II ~ 12 Sand/soil
~ ~ mix la er II II ~ ~ - - ` y
12 x 12 Inlet Box wl 6" PVC drain i e ~ ~ IC
p p roof overhang
2 for 266,5 s , ft. Note; 24 Sand layer N Entire bioretention Date: 10 November 2009
o basin iS brick masonry o
construction on concrete ~ Revised: footings-to match 31-411
~ 10 x 24 Proposed Addition with foundation walls interior width
existing heat pump 12" roof overhan ends and 3" roof overhan side 4 PVC perforated 9( ) 9( ) 2 S.
outlet drain, wrapped p~ ~ a ~ ~ iA•Y ~k 1 Y • i iLbl VYl ~r%'Y' i':
Isometric a~ iii in filter fabric. 2110 Woodrow St. Durham N BXIStIYIg hOUSe 6cale:1" = 2'-0" ~~%p ~n " Durham, NC 2771 3 1 f1
h
plan enlar ement
secondar downs out ~ • ' ~ ~ ~ ' y p from pond side save
downspout Key Quant Botanical Name Common Name Size Remarks
Sourwood 2 Oxydendrum arboreum Sourwood 15 gal mitigation-tre x a ition 1Zemove Sod, and till
Serviceberr 1 Ame/anchierx randiflora 'Autumn Brilliance' 'Autumn Brilliance' Serviceberr 15 al miti ation-tre native Soil, prior to
placing sand layer J. Carman s Gray ® 20 Juncus patens Carman s Gray California Gray Rush #32 bioretention
P. orientale 0 16 Pennisetum orienta/e'Karley Rose' 'Karley Rase' Oriental Fountain Grass #18 bioretention to =385.0 top=385.12
P. 'K. Rose' 0 10 Pennisetum orienta/e Oriental Fountain Grass #32 bioretention Filter fabric liner, all Sides
Grasses available from Hoffman Nurser , Rou emont, NC 800-203-8590; www.hoffmannurser .com wee holes
p 8 overNow planting Schedule 16" O.G. 12" Soil/sand mix
24" sand
slope at `
bioretention ~ ~ ? ? ~ =15.2°/u ~ • Proposed drainage area: drainage area:
? Southwest ~ \ 5,925 say. ft. ft.
extend PVC dram GOncrete f00ting5 ~ (1,504 s0~. ft, impervious) ft. impervious)
? existin drama earea: Eievatlon through brlGk Wall ~ \ 9 g v v Proposed drainage area is ? ? V ? 5 925 s . ft. 5cale:1" = 5'-0" ~ ~ , ~ ti identical to existing drainage arc Linage area io °xisting drainage area,
? a ~ with hi her im ervious ercenta •f ? ? 1,217 s . ft, im ervlous ~ ~ ` ( 9 - p - - p • 1. ~ ~ a P ) ~ ~ 00 -see existin conditions mpervious percentage) conditions
~ ~ ? , ~0 v e
r ~ ,fi'~ f~ , \ , J' \ F F o
9 Y - \ 1' •~k,J R s ? 8-P, orientale 8 P, orientale ~5 \
~~,.5 tit- ? ~+t .ice ? v slope at ~ ? ? \ ~ Pro osed at Mention
I ? ' ? ~ Bloret ntlo / ,t~3 \bioretention x - ~i~' ? C'G"Nt;'REIL ~ (see etal~ / `=15.2°l0
• ? P. 80~ 1987/1065 ~ r ` _ time~ef W11065
\ ~ r \ t ? 3
~ 4 ? I I I ~ PY0~705ed ~-50urwGGd „ . • 20-J Carman s bra i2 X24' -Z-sou rwood
r , , ~ I I ~ Addition ~ ~ A ~ r ~ dCAd °s. ~ ? 10-P. i\,~ose - ~ ti xr' kx I exist. heat pump ti
~ ,,P^~ i 10 o,c. (typ,) ~ lOT 77 ~ 5~~ ~ sou~sm ~ snuWAs>M car
~ ~ a°j~ ~ u b M 378 toT 76 \ s' ? The soil mix should be uniform and free of stones stum s 9,531 sq. R a< , y~ I x Cx15t.kGA~.urY9~ ? ~ p ~ (7 ~J 3781 OF LOT 76 (1/7' 0% PPE,
~Y,~ TT " ~ . • r ~x;~~,,,;~ roots or other similar material greater than 2 inches. It 422 acres ~ ~ x 7 ,e r ~ ° - ~ - ~ ~ x ~'~r'~~ should be a homo enous soil mlx of 85-88 ercent b %<a~~~' o ~ ~ ' i i
v\~f • ~ ~ k; -f ~ . ~ ~ , weight sand (USD Soil Textural Classifica ion), 8 to 12 ~o ~o,~ X ~ i
• • f ~ ~ ~ percent fines (silt and clay), and 3 to 5 percent organic ~ ~ y ~ ~~ti ~ ~ ~ ~ (COO
r;. ? • • ~ matter (such as peat moss) shall be used. ~2 i\ ~ ~ ? ~ 2 aye ~
. Bioretention ~ `ti ~ ~
' ? r ~ plantin La out a e~ ~ ~ r ~ ~ ~
ti A r ~ 161 0o ra ~ ~ ti t
.~;1 rr 5.Y r f r•4 ^;C~F~~ ~P,'SC~.",'A1i31 ~~lfh5 e ~P ~~''k~ .av a o`anntl>=:,•p p~`5 ym~~0 5 ~ r"• 'k :'t ti~ L:i.;r,[7'93d5 ?{~yth fla 3 ~i ~ i
r,. C: ~A5r~3.~ ~ Pin- :'~'J•yi' :,:'t o~
' ? ~ 64 y r ~
? _ Site at - X •,,w : k.. ° 219 Kirkfield Dr. ~ ~e<
't ~ , ~ U ~ ~ 1-5ervic 1-5erviceberry
~ r Frn=. -dl nB x ' • 1#'' ~ ~ 9 0~ `I
~ ~ ~ ~ o~
a~`. . Lake !y t ,5 ~ a~ ' ~ ~ :^delrgbaroug7 ~11,~~,el`-"'! -
'16 sa 3~ 5 a tAKE ,t~~ :"1~oadshi•e '•"re I rg:on 06 BOM 1987 1465
~ti~ r ~ ro ~1 ~c,.
X _ eft - ,`I:4,- ~,y 'u'Jcllnr1h11 R~ ~ 0
~t , k Ra ~ ~ ~ edge of vegetation
~ ..74~ 3 n~ft~ .y1
{ ~ s,~ . ~ , ' ; ' ~,na°r~w .551 r ,-101.x„ . - ~ ~ 551
Existing Conditions ~ o ~0 20 40 ~
• r ~ Scale: 1" = 20'-0" a SCALE: 1 /N. = 20 lT Vicinit Ma 4~~ . • 1.,1 s ~ (ly 2

STATE OF NORTH CAROLINA FIRM PANEL LOCATOR DIAGRAM LEGEND
2 070 000 FEET ZONE AE 78°45' 30" 78°45' 00" 78°44' 30" 703 00o M JOINS PANEL 0773 704 00o M 78°44' 30" 78°44' 00" 2 077 500 FEET 705 00o M 2 aso 00o FEET SPECIAL FLOOD HAZARD AREAS (SFHAs) SUBJECT TO
GRANVILLE 730 000 FEET ~ ~ • a - ~ 392 :Q~ ` ` . ~,w • -1"°~~ ,-•,o u ~;f- cq 730 00o FEET ~ INUNDATION BY THE 1 % ANNUAL CHANCE FLOOD
ALICARY CT 1 J~ ~ 4. F '•l ~~s', r ~r` ~SS9 The 1 annual chance flood DO- ear flood also known as the base flood is the flood
~ - - - Town of Car ~ ~ ~ v.~ ~ • ~ a~ y ~ - "'j• ,t qos e that has a 1 chance of being equaled or exceeded in any given year. The Special r loo. Flood Hazard Area is the area subject to flooding by the 1 % annual chance Flood. Areas
DURHAM ~ ~ 1( ` - 0 . °r. `ti FRANKLIN I ~1 ' e • ~ g2 Town of Car Extraterritonal Junsdicnon • tiz: t~ ~ ~ ~5 f •w ' ~ p7 ~ of Special Flood Hazard include Zones A, AE, AH, AO, AR, A99, V, and VE. The Base ' -r'~Ia I h ' ~ = t(ggo Ro Clty Of Flood Elevation is the water-surface elevation of the 1% annual chance flood.
00~~ 3 y V r • ; ,r t~ ~F h ~ rv ~ ~ k ` k" ~ Raleigh ZONE A No Base Flood Elevations determined.
3959 oaa j EZ1071 Extr-aterritorial Jurisdiction •.~..;z 370238 . 1. ~ 1 ~ J• ~ 6• `~F`}F ~r1:'.~,' t' ~~js~~'~ }fd6;' ~ ZONE AE Base Flood Elevations determined.
_ •2 37(]243 ZONE AH Flood de the of 1 to 3 feet (usual) areas of ondinn, Base Flood
64 ' RINq C Q °S~ ' ~o- .,ir1 ~ +.o-dl t•'a i.>•',G'g'' 4. Y' ! ' ~ ;,'4'. ~'J ,rf - ' " ~rJ ~'~L•J ' ,iY~ 4',x,~. t'"'~ 'd` r Q 3959 OOO M P Y P 6!+ ~ ~ ~ , Elevations determined.
~ D 1 iQ 'SOP r : ! - , iy^.y~r. t~l~''_ '~`h~`~;14 , ~ rte{ u ZONE AO Flood depths of 1 to 3 feet (usually sheet flow on sloping terrain); n • . • , .~,k, tom. _ average depths determined. For areas of alluvial fan flooding, velocities
D ~ ' } _ / ~ ~Y:. it ? " r r,` ~r Z EX egg ZONEX i~ .5,.x; • also determined.
1 ~t 3 ~ h , 'f~ _ , - ~ , k~,-= 1_ ' ° t~hr¦ ZONE AR S ecial Flood Hazard Area former) rotected from the 1% annual
~ ~4' as ~ . ~ ~ . ZONE X ~ ~x ,A ~ a'~ S City of Raleigh chance flood by a flood controlPsystem that was subsequently
1\ ;~f t PO f Fib. " 1-'r;tik i ~ , S " ~ . ' is `w ~ ~ ~ ~ Extraterritorial decertified. Zone AR indicates that the former flood control system is l1/ ` • : ~'t • r> being restored to provide protection from the 1% annual chance or
~~9't•~=$ } ~VqK °F cgRy z " . ~ Jurisdiction greater flood. E C ZONE A99 Area to be rotected from 1 % annual chance flood b a Federal
JOHNSTON •.3~~ •,y, _ r - i ~ r i +_:a~ ~ g~• Y ~ ',1~1 O~N~ . 370243 flood protection system under construction; no Base Flood Elevations
i r ZONE AE f6_ ~ r w ~f ~ " r k , ' Yak Y .,.,f , :k ~1 1. f. tl . ~ determined.
"ZONE X ~g ~ i7: ,.y?r r r ; ~ a.~1', ZONE VE Coastal flood zone with velocity hazard (wave action); Base Flood Elevations • r L- determined.
HARNETT \ J *~.:t ZONE X ~ c rv ~ ry c.•~,t ti: Yf~. . ' 361 ,i~,,~ , . Town of Cary ~ Jti
r.... I SbnaghtBranch - ERLOT CT ~y~3' 7~+T,q~; ~.r L`°~ p r.;-ila, !.°'.9~~,". re ~y' r~}~" •'i,. ,M k .a'. i.• .Y .L III "C'i ill ib ,f''.i.. `'!~.r.°. om (Basin 20, Stream 23) .•~k s.,,{ , . ~ ;1~~+ .k •°3 ~.t;: k- . .Extraterritorial . ~ ~ ~P°SS P ~ FLOODWAY AREAS IN ZONE AE
I ~ urisdiction o J,~Ea A~ ~ The floodwa is the channel of a stream lus an ad acent Flood lain areas that must be J ~5 Q~ s 9A Y P Y 1 P _ lF kept free of encroachment so that the 1% annual chance flood can be carried without
L ~u`YGpK . n. i.~V~F 4 45: ~t'M1.y 5~+_~l Fk x•,~ I, ° l 370238" o~ ~N ~'v 35° 45' oo ^ substantial increases in flood heights.
35°45'00.. ~ ,ry ~.:..fp. ~ • Town of • G 1 ~ ,~ia~, 5~ 4 n,ta,~` , ..a, ZONE X a oo`' ~ G~oEa 2:
r+° ~ ~ t:. , ~ Cary y yob ey vP~s ~ ~ OTHER FLOOD AREAS `~1•"`: ~ City of GPI , . 90, g ti
` Ct 1 n ~2'• ZONE X Areas of 0.2 % annual chance flood; areas of future conditions 1% annual
~ q ~ ~ ~ k°•, • ~ 370238 t a •1• Raleigh 0 ~g ~ ~ o~ ~ chance flood; areas of 1°~ annual chance flood with average depths of less € , ~ } ~o? y y~. ~ than 1 foot or with drainage areas less than 1 square mile; and areas
~ \370243 • ~ ~o ml~ ~2 v~ protected by levees from 1°~ annual chance Flood.
DATUM INFORMATION ~ ~ e. o ' ~ .-~a ' ' .~J . . 0 G d! '+4 O .e~y Y• `ham a- ° F~' t~ • ~ y 727 500 FEET r + t' 00 ? Clty Of r ~ ~ OTHER AREAS
The projection used in the preparation of this map was the North Carolina I ° s (yG ~ _ ~x ° , ~ R~.,"ti ' ~ ~ A wooDAu •^~~i:. ~ i m Ralei h
State Plane (FIPSZONE 3200?. The horizontal datum was the North American ~ - ~ a p H „z. t ~ Datum of 1983, GRS80 ellipsoid. Differences in datum, ellipsoid, protection, or / ~ o~ ' ~ i' r5s~~: ' ' ¢ ri ' ~ °'Y~' EZ3284 ® a,.b, m ~ g ZONE X Areas determined to be outside the 0.2% annual chance and future ' ~ o ~ S .1 4^ conditions 1 % annual chance floodplain.
Universal Transverse Mercator zones used In the roduction of FIRMs for ad acent ZONE AE ~ ' ,Y;~ °r ' ' r~ ~~.lp' ~~t k. ~ r~ig ° A 370243 , • " ZONED Areas in which flood hazards are undetermined, but possible.
jurisdictions may result in slight positional differences in map features across l ~,•'s.' ~y ',~,5,' ~ ;r'` ~ a" - ~k ,k r , ~Y~~; ~ ~a
jurisdictional boundaries. These differences do not affect the accuracy of this ZONE AE 2 ,~m'• • °o ~ • 4•'~'' • " ~ ~ , • 1 ~ . 1 ~ COASTAL BARRIER RESOURCES SYSTEM (CBRS) AREAS ,IY,;.. ~Lti" r I
FIRM, All coordinates on this ma are In U,S, Surve Feet, where ~ ' qo 'v ' :~~~t r, ~ ~ ~ ~ • . 1 U.S. Survey Foot = 1200/3937 Meters. Z NE X - °~s' ~ ~ ~ a ~ ~
0 • ~ 'r 35 W ' • ,rs,. • swlFrsiDE DR ~ \ OTHERWISE PROTECTED AREAS (OPAs)
Flood elevations on this ma are referenced to the North American Vertical ~ ~°R ~ 4 '~::.'I~r,~.k P I JPS~o , a r,~,. ~ . ~ l>s ~ ~ CBRS areas and OPAs are normal) located within or ad scent to S ecial Flood Hazard Areas. • ~ Y 1 P
Datum of 1988 (NAND 88). These flood elevations must be compared to structure i .t~ . . , s, . and round elevations referenced to the same vertical datum. An avers e ~ _ ~ - , SWIFT CREEK AZ MK ~ " ~ 1°~ annual chance floodplain boundary EZ3293 • ® ~
. offset between NAND 88 and the National Geodetic Vertical Datum of 1929 ` . 1~~ ` ` F~ ' ' Lens Branch ~ ACCESS ROAD " - ~ s'w. " G TRYO 0.2% annual chance floodplain boundary and future
(NGVD 29) has been computed for each North Carolina county This offset was 3.•. • . rnt ~ ~ ~ ° N RD 57 ''u ' titi'r . ~ . • SWIFT CREEK RM 3 ATKINS conditions 1% annual chance floodplain boundary • EZ3294 EZ3148 • • • - - - - ~ Floodway boundary
then applied to the NGVD 29 flood elevations that were not revised during the ZONE X : ,r , y - • : - ~ . ' ~N~~ e _ . creation of this statewide format FIRM. The offsets for each county shown on 3958 ~ Lens Branch ~ ~ ~ ~ ° ~ • ~ '0t ` ~ ~ Zone D Bounds • SWIFT. CREEK - -
this FIRM panel are shown in the vertical datum offset table below. Where a Baran 20, Steam 22) ~ ~ P ' ELEMENTARY ~'~i" • ~ . • ~ CBRS and OPA boundary
T ~ • 1 Town of Car . . county boundary and a flooding source with unrevised NGVD 29 flood elevations ~ D ~ ' v 9•' y I ~ Q Town of SoH~in f .r
are coincident an individual off et ha been calculated and a lied Burin the ZONE X z h' ` ~ • . o~, s s PP 9 ~ ~ } c F xtraterrrtorlla creation of this statewide format FIRM. See Section 6.1 of the accompanying 1 f,~ o • 09 Z~U City Of Raleigh a+ ~ 3958 ooo M • • • • • • • Boundary dividing Special Flood Hazard Area Zones and ~ .Cary ~ ~ ~ • • • • • a ~ boundary dividing Special Flood Hazard Areas of different m
the conversion . p ° : ~ urisdiction' Flood Insurance Study report to obtain further information on 1, . - ,,r • ~ J ~ p EXtraterrltOrlal 1 " 6 Base Flood Elevations, flood depths or flood velocities. W x•370238 . 513 Base Flood Elevation line and value; elevation in feet*
of elevations between NAND 88 and NGVD 29. To obtain current elevation 3S4 w~;•,a:~:F ~ • 'x ' ~Q ' , • 9 -'•s, CHASFiCT Q' FRANKLIN 370238 Z Jurisdiction 6••,. ~ ~ Base Flood Elevation value where uniform within zone;
description, and/or location information for bench marks shown on this map, ~'k;. ~ ° ReaECCA • : ° I 353 ~ W. ~ , , ~ ~ . clRCLe P please contact the North Carolina Geodetic Survey at the address shown below. i • ,4..F - N •F,t • Q 'yr (EL 987) elevation in feet* - w ~ ~ swl~ ~CAEEK 370243 ~ ~
You may also contact the Information Services Branch of the National Geodetic 44, , ~ ~r ~I i . , ,••h ELEMENTARY SCHOOL' ,i 9~F ~'i?rr *Referenced to the North American Vertical Datum of 1988
Surve at 301 713.3242 or visit its website at www.n s.noaa. ov. ZONE X ~ / ' . 3 . , . ~ 4 m Z - Y ~ ) 9 9 t?',''' f RVIStp ~ z OP r,. - ~ ~ m; ~ a / ms Cross section line
0 a F - North Carolina Geodetic Surve Count Avers e Vertical Datum Offset Table / FRA ~ ~ ~ ~ : ~ , e~'{f 4 I i ~ 1~..5- ' X20 ' ~ V `.,.~ti}~s tri'21'+v'! ' r~' Sf~a' 9 yi~•. 23 23 Transectline
Y Y g ~ ZONE AE d~ NXUN H ~ _ , o s. o- .Q ~ : ~ 121 West Jones Street County Vertical Datum Offset (itt o~P EIGHTS RD o ~ ~ 0
Raleigh, NC 27601 Wake - D 88 Oq° • • . . , o D cD e ~ il :'t _ - , ' + 5.. ,4L~~, „s. I, r t • ographic coordinates referenced to the North American } 'fir;', 7" r• 9T°07'30 32°2Z'30° Ge I - 4 • ~,T k.• ~ ~ Datum of 1983 (NAD 83)
[phone] I1 v SSW o '.:,5 - ,'w!., ° . ~ < ° o I ~ w ,off ,h • ' z wx!'' - - - Fd1 ~ YL ~ " 1 a I 4276oooM 1000-meter Universal Transverse Mercator rid ticks zone 17
www,ncgs,state,nc,us 4 42 q Ay m ` ' , ~ ~ • • - ~ t ~ ~ ~ ~ y` " ~ 2500-foot grid values: North Carolina State Plane coordinate
Example: NAND 88 = NGVD 29 + (-0.88) 35°44'30" ~ ~ r? ~ OLD BRIDGE LN m 9': - w ~ a ~ : f • ~ ".'r, +;T`t 35°44' 30" 1477 500 FEET s m FIPSZONE 3200 State Plane NAD 83 feet) ~ { -
q/~ ~ I h ~ a' ' ~ I *~y +i • v, North Carolina Geodetic Surve bench mark (see ex lanation ~ a~~•'a L ~ ~ a"' _ BM5510 X in the Datum Information section of this FIRM panep.
I All streams listed in the Flood Hazard Data Table below were studied by i ~ _ o ~ • ° FFH ° ~ , HEADLANDS LN ~ OT _ r.,,¢..;;;. ,e ~ Y 9 L 4 ,i~,r ~ ~ ' ~ ~ ~ • i - BM5510 National Geodetic Survey bench mark (see explanation in ~~F , ~ 1stifF~~v;.• I ~ _ , § 'ENCHANTED RD
detailed methods using field survey Other flood hazard data shown on this I n : RIBBON LN r- DAN ,rn , ~ ma ma have been derived usin either a coastal anal sis or limited detailed ~ ^ti4C1E ' SCR • .r. • ~ P Y 9 Y l ~ , sr F G~ °~'Cr .rv' ,~~,r~, ''i°.r5. ~ L'a' 4r ~ ,i ~ 1 ~ t ~ • ~ - 5 ~ ~ ; , 5 - . ® the Datum Information section of this FIRM panel).
rivenne analysis. More Information on the flooding sources studied by these j ~ c~7 ~ ' r • ; ! ~•i ~ r.~ + + • ~ ~ • r ~ •ry ~ s M1.5 River Mile
- k Z' d'.W I JF 0 h ti.JG~ ,D,. ~ , }~,I ,i',f analyses Is contained in the Flood Insurance Study report. a ~ . k Jk ~ - ~ .DR ~~y~c ~ u A ~ ~t ~ Ya{~, r a,} h' •y R;,, BFM1,~,:.' 1y _ N ' + ~ 4 , ~ ~ k lam. P'•~
0 o I ~ i FOX BRIAR LN ~ ~ ~ 2. GP 2 , - Y ti ~ a . Flocdway Width lfeetl O 1 ° ~ Q Sp'; mJ . •a ,r a ~ ~ , r~ ,,,ANGEL HARE LN ~ ~
FLOOD HAZARD DATATABLE ,%Annoalchanoe ~ L~ ( ,2 - qqT , ~ t','~t:: 110D~eerl LeilRightDistanceFrom LLl y I/ ~ Q Q 0 Q0~ Z v'+-p, 'r' a`t ~,R ~ • • 1;, Its} I ~ ,i' ~ i Nt' W
the Center of Sveam to J J ~ m S ° /~Q Q ' ' x ~ • ~ 1%Annual Chance Future Condlllons Z ' ~ a ~ - CT`~_ 0 ' ~ ~ ~ J. Cross Stream Flood Dischar a Encroachment Boundary Q / ~ ~ ~ - ''-k S•" a0 m ~ -a ~ k L to{~ " € ~ `5}" ' g [100~ear) WaterSudace Elevation } ~ D _ ~ k k r~• , 6 ~ ~~Iiy , - ai~}~i r 1 ~ r }i~ a s'~..af i#?~'• G~ Z
Section Station' (cis) Walarsurtaca Elevator feet NAND 00 (Looking DownsVeaml or tl ~ W ~ 0 T UNS(0 ~ ~7f°+:I ( I To,slFloodwayWidth UN ~ (feet NAND 881 ~ _ ` ~OOD a •,~~r,;, RICE RANCH WAY -F:.d~,,~, P OwER HAMLET W.~T• Y,i `4';r~~'.; • .~:,'iti k
LENS BRANCH (BASIN 20, STREAM 22) ~ _ • l° ,-,~•t} • s ~ 'r I r~
1 D9 1 D,85D NA 356.8 NA 570 ~ FND 'ppGENHAM LN 's, " , , • , ~ y,/r'~tr ,~,tis' ~L`I ~ ` it Y
STRAIGHT BRANCH (BASIN 20, STREAM 23) DUCKHEAD PT _ , , ~ - ; 1ti Y Y ~ I Z ) ~LIIP ~ I `.1 .
020 1,950 NA 366.5 NA 174 rl 0 CA ~ ~aK' f ~ E•-' 034 3,395 NA 391.6 NA 375 ZONE X y°~ , . OO~T ~ ~ RY p,~ 1 t • I ' ,ry` / ~ -.a: i• ~ d!
.f S~q Q .'-•15.-,1 'J'3y :'..i . • i 'Feetabove mouth °L~>ti - ~•,5 ry - m - v . , . •~",I t-. a~~ f.k ,
,~p° q , , ~ . ~ ~ , . ~ , Town of C Town of Cary s_°" _ I , ~ ra~~ ~ PATES Mlll POND
o W ° - ' . ,J ' ti, } , y I L: ELEMENTARY iterritorial Jurisdiction .''Y ~r i r r+ ~ f•~~.,ry' ~ ~ ~ K SCHOOL
34 SC071A pL . U ~ Extraterritorial JL ' LOCHMEBE LAKE ' r • ' r ~ oP , ~ ~ Py SrRAT w f'` v~ ,:.:f+:,~ ~'4'y ~OQ~ ~
370238 . ~ 0~' HBUR o 5 "~0 GH LN.T Yr~.• F 370238 ~ i. k ,1 f '
~ J I ' ~ ~
3957 0 p 1: r{. ` ~ Oq' @ '`Cri t.' . x 'Cr ° • ' '4r y~~h ~ i ~ f• W • ri,:
ZONE AE 050 ti, °tiEP • oP~ 09 1,y~ ~ MDF o , ~e •,r~Y „ , 5~' h§'ti ~ra',~ I~. ~ •;~-~`a~~'11'. ' ~ ZONE X 'S~r ~ ~ ~ 4
GREENPARK LN 0 CR/0 . Q, , r~: N F k o s,? •hL "kS ~ I ~ Y•",~ r zr Q t#r f ~ 1r ~,ry~s,:~ ~ r'~ ti Y ~ :1 i7'` U ~ a + c . `r ~ _ 3957 aao M
, r { '1'4 %o,' a 5 - I ~ 1 +l P-
° • , t ,24 ~'"~,k 1 ra1F'(~~ ' Q~ I~ Y~yr ~~j°11j,~f~y 'f yk' . + '{-4g~J~y, 1' rtl`&`'~ ~~'~~.;2 t~'4~ ' .1 Z. 1111~~
722 500 FEET :i: r ~ Z i • ~r 9~ ToWn Of pP y~' • t; . H . Y -,~sb , ~ ~Y , R,; . J~ ~'t ° „J~ i a~ 3~,• I z , ;r S ^z t a r /AI F11 Fi ll.\ ' ~ . • /tea{ ~ ~ nu.a~o_u\~~ IW~\ r rr`k l ~ {i J n 0:, ~ :e~,s r yJ ~i
Z . ~ ~ N PISA ~,S ~ 'I ~ d~ y 4„, ~yy'!~ y Y ~ ' Q . fit.- I N ~i Iyf~ rl, § ~ ra ~ 4r- *r" ilia ~ ,~L Wake County kcr'`~"'~~~+ GRID NORTH
o m -Cary F° ~ Y . ,y}' r .',F" I ~ ^ ~ y~~1 ijy ~ +Ij.•~~~3+iW !'S:S' st 4y'`-~ ''~Ir r , 4~A~~'a:`i.
• ~ 370238 ~ ~ .~R ~ K', . - -a ~',r.~~:; L~~ • ~l ' • ~ .Unincorporated Areas MaP scAl_E 1" = soo~ ~1 s,oooJ L ~'•~'`r.•s,.~s~~ tai } ,~+~.iX'; . 250 0 500 1000
~ ZONE X ~ ; ~ - ~ • , ~ , _ ~ r` R"~a'~~ • 0~"r y . 2 ~ 4 i,..I ..-~~rt?~r~_ -..N4~ .ygg~~'Fi"~.. yy ~r~ a 1 fad. 1 1" r ~ t I?; i~Y . , 370368 - - ' ~a FEET
LOCHSIDE DR ,7. r,, ~ p ~ a ~ i e * , f'r.M' "r'rk' rf~ t ~ . a Fvy' METERS
, 35° 44' 00" fEL 342) . ~ . , ST DR ` ' ' ~ ~ ~,'i ':o , ~ 'i' 4 ~ NF I• ` I~ L+! 35° 44' 00 " 150 0 150 300 . a ' ' ~a,• ROLLING OAKS LN ~ „ 1 ° '
FLOODING EFFECTS FROM LOCHWOOD"EA WINDFALL CT SPRING RIDGE Rp " i` o
LENS BRANCH • I ~ o • (BASIN 20. STREAM 22) ~ s ~'•a '.',c
LOCH- OOD WEST•DR s ~ ~ ~ ,Y" G ~ _ j, • , I -
ZONE AE , • :1 ~ , e`~ ND SrR . F • o,. ~ , z° ~•s. ' IEL 342) s • a; m ~ Ott °~Q bV f' .y " i ~ ,i " ' l5 Wpti•~~, t , 3 ~:L ~r'~, •.`'I y.' rL~•, m PANEL 0772)
ZONE X vo - o ~ ~ a •.A~. t~.:; aA d.. r ~ m I ¦ - }
WINDY POn ~Q SPRING HOLLOW LN h , _ I O y ' + , . k" INT LN T I•. a •
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:.~J - . ~ kl, " o 9 WEATHERLY PL ~ _ ~ • ~ m FLOOD INSURANCE RATE MAP
~ t• it I' - D r • ~ ' i..':~gL,. d 4:J ~ ~ . ~ TOWN OF CARY ~ , ' - ~h~ °~r:.. m ~ ~ ~-.~,~r~• F~~A NORTH CAROLINA
. Vii" _ ~yr V , } ~ ~ .
~q 'WAKE COUNTY ~ / INTF y ~ r. ~ h {F7.@ ~~_f of `4_. ~ K1`4.. - Jkl.".: L ~F i• f i ~ "moo' O ~ I ~t..M1. i i~ ~ ~ ~M +i`~M.,. CAMPBELL WOOD DR r.. 0 ° ~r ~ ' ~ F l r ~ ~ CO
I FLOODING EFFECTS FROM RSW OF CARY '•'~:~t V+ TOWN I LENS BRANCH OD - I"'• '>>g;~••, ''+F. "'9'e L . y Ili ~ ~r• ' ~ .r i ~ ~ ~ . , ~ ~ m PANEL 0112
li (BASIN 20, STREAM 22) ~M ~ '1~ ° - ' , WAKE COUNTY ' Y'~
I ZONE AE - ~ ~ SWIFT RIDGE RD _ •'~r ~i~'y k^;,' F y~`~~ r, 1~+ • ~ ~ (SEE LOCATOR DIAGRAM OR MAP INDEX FOR FIRM
Town of Ca , rY „ , - ;k •,Y..' ; '.~T4.ry,~ ~ n• ~ .o ''ly$~r+° >E ~ • ':4, PANEL LAYOUT)
~ °EE PqR Extraterritorial Jurisdiction ~9c~^ J r~ \ K LN - ~YD ~t dw- 1 fF.°, ,0 i Y ~,°I *iv1'w:~' r , , . 'ff, s + d ; e r i .rl~ • CONTAINS:
, , s°~ `'t•' ~ ~ :1:~` ~ # ~ 'rte ~g -0 ~ rw. ' ` ~ T'i~ g - ~ . , ~ ~ ti COMMUNITY CID No. PANEL SUFFIX
342 I 370238 K. ~ , ~s!~:~° ~ 'o•; , .,rw., " w ~ L I- - HI 7- ' ~ • I• r' ' 720 000 FEET ® CARP, TOWN OF 370238 0772 J
720 000 FEET ¦ 'r.•:' . • s~. 3 r. ~1 . tt ~S r r-,+ , • 705 00o M 2 080 000 FEET RALEIGH, CITY OF 370243 0772 J
2 070 000 FEET 703 00o M JOINS PANEL 0771 704 00o M 78°45'30" 2 072 500 FEET 78°45'00" 78°44'30" 78°44' 30" 78°44' OD" D WAKE COUNTY 370368 0772 J
NUI L5 IU U5tK5
This map is for use in administering the National Flood Insurance Program. It does not Certain areas not in Special Flood Hazard Areas may be protected by flood control This map reflects more detailed and up-to-date stream chi date stream channel configurations than MAP REPOSITORY
necessarily identify all areas subject to flooding, particularly from local drainage sources structures. Refer to Section 4.4 "Flood Protection Measures" of the Flood Insurance those shown on the previous FIRM for this jurisdiction. Th ~ 5TA1z~ ~eA~~ of small size. The community map repository should be consulted for possible Study report for information on flood control structures in this jurisdiction. that were transferred from the previous FIRM may have L p3 s jurisdiction. The fl0otlplainS and fl0odwayS Refer to listing of Map Repositories on Map Index or visit www.ncfloodmaps.com. may have been adjusted to conform to
~ o updated or additional flood hazard information. these new stream channel configurations. As a result, the I ~s a result, the Flood Profiles and Floodway
Base map information and geospatial data used to develop this FIRM were obtained from Data tables in the Flood Insurance Study report (which co report (which contains authoritative hydraulic EFFECTIVE DATE OF FLOOD INSURANCE RATE MAP PANEL
10 0 To obtain more detailed information in areas where Base Flood Elevations (BFEs) ~ various organizations, including the participating local community(ies), state and federal data) may reflect stream channel distances that differ from 1 ti and/or floodways have been determined, users are encouraged to consult the Flood agencies, and/or other sources. The base for this FIRM is aerial imagery acquired b FEMA~SCOOPERATING TECHNICAL PARTNER Gay Profiles Floodwa Data Limited Detailed Flood Hazard Data and/or Summa of Stillwater primary y -iat differ from what is shown on this map. MAY 2, 2006
ND sy Summary Wake County. The time period of collection for the imagery is 1999. Information and Please refer to the separately printed Map Index for an Index for an overview map of the county EFFECTIVE DATE(S)OF REVISION(S)TO THIS PANEL Notice to User: The Map Number shown below should be used
Elevations tables contained within the Flood Insurance Study (FIS) report that accompanies eospatial data supplied by the local communitY(ies) that met FEMA base map specifications showing the layout of map panels, this FIRM. Users should be aware that BFEs shown on the FIRM represent rounded g community map repositor+ Ly map repository addresses, and a Listing of when placing map orders; the Community Number shown
were considered the preferred source for development of the base map. See geospatial Communities table containing National Flood Insurance ProgrE whole-foot elevations. These BFEs are intended for flood insurance rating purposes Insurance Program dates for each community commu hry. Id be used on insurance applications forme subject
This digital Flood Insurance Rate Map (FIRM) was produced through a unique only and should not be used as the sole source of flood elevation information. Accordingly, preta for the associated digital FIRM for additional information about base map as well as a listing of the panels on which each commu cooperative partnership between the State of North Carolina and the Federal flood elevation data presented in the FIS report should be utilized in conjunction with prepararati on. ,h each community is located. ® EFFECTIVE DATE MAP NUMBER
Emergency Management Agency (FEMA). The State of North Carolina has If you have questions about this map, or questions cc the FIRM for purposes of construction and/or floodplain management. Base map features shown on this map, such as corporate limits, are based on the Insurance Program in general, please call l-877-FEMA MAP or questions concerning the National Flood MAY 2 2006 31200112001
implemented a long term approach of floodplain management to decrease -877-FEMA MAP (1-877-336-2627) or visit the
the costs associated with flooding. This is demonstrated by the State's com- Boundaries of regulatory floodways shown on the FIRM for flooding sources studied most up-to-date data available at the time of publication. Changes in the corporate FEMA webslte at www.fema.gov. mitment to map floodplain areas at the local level. As a part of this effort, the by detailed methods were computed at cross sections and interpolated between cross limits may have occurred since this map was published. Map users should For community map revision history prior to statewide mapping, refer to the Community Map CCDD e4~ History table located in the Flood Insurance Study report for this jurisdiction.
State of North Carolina has joined in a Cooperating Technical State agreement sections. The floodways were based on hydraulic considerations with regard to requirements consult the appropriate community official or website to verify current conditions of An accompanying Flood Insurance Study report, Letter of M port, Letter of Map Revision (LOMB) or Letter
with FEMA to produce and maintain this digital FIRM. of the National Flood Insurance Program. Floodway widths and other pertinent floodway jurisdictional boundaries and base map features. This map may contain roads that were of Map Amendment (LOMA) revising portions of this pane ins of this panel, and digital versions of this To determine if flood insurance is available in this community, contact your insurance agent, the y~ .g o Lina Floodplain Mapping Program website North Carolina Division of Emergency Management or the National Flood Insurance Program at the K
data for flooding sources studied by detailed methods as well as non-encroachment widths not considered in the hydraulic analysis of streams where no new hydraulic model was FIRM may be available. Visit the North Carolina Floodplai for flooding sources studied by limited detailed methods are provided in the FIS report created during the production of this statewide format FIRM. at www.ncfloodmaps.com, or contact the FEMA Map Servic MA Map Service Center at 1-800-358-9616 following phone numbers or websites:
VVWW.ncfloodmaps.com for this jurisdiction. The FIS report also provides instructions for determining a floodway for information on all related products associated with this FI ated with this FIRM. The FEMA Map Service NC Division of Emergency Management National Flood Insurance Program State of North Carolina
using non-encroachment widths for flooding sources studied by limited detailed methods. Center may also be reached by Fax at 1-800-358-9620 and its )58-9620 and its website at www.mse.fema.gov. [phone] www.nccrimecontrol.org/nfip 1-800-638-6620 www.fema.gov/nfip 777 Federal Emergency Management Agency

Permit Number:
o?oF w a rF9QG
®'
=' r
NCDENR °
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
BIORETENTION CELL SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information.
1. PROJECT INFORMATION
Project name Addition to Allouba Residence, 219 Kirkfield Drive, Cary, NC
Contact name Howard A. Partner, R.L.A.
Phone number 919-286-6638
Date August 23, 2009
Drainage area number 1 of 1
Site Characteristics
Drainage area
Impervious area
Percent impervious
Design rainfall depth
Peak Flow Calculations
Is pre/post control of the 1-yr, 24-hr peak flow required?
1-yr, 24-hr runoff depth
1-yr, 24-hr intensity
Pre-development 1-yr, 24-hr peak flow
Post-development 1-yr, 24-hr peak flow
Pre/Post 1-yr, 24-hr peak control
Storage Volume: Non-SA Waters
Minimum volume required
Volume provided
Storage Volume: SA Waters
1.5" runoff volume
Pre-development 1-yr, 24-hr runoff
Post-development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Cell Dimensions
Ponding depth of water
Ponding depth of water
Surface area of the top of the bioretention cell
Length:
Width:
-or- Radius
Media and Soils Summary
Drawdown time, ponded volume
Drawdown time, to 24 inches below surface
Drawdown time, total:
In-situ soil:
Soil permeability
Planting media soil:
Soil permeability
Soil composition
%Sand (by weight)
%Fines (by weight)
%Organic (by weight)
Form SW401-Bioretention-Rev.8
July 30, 2009
267 ft2
267 ft2
100.0% %
1.0 inch
N (Y or N)
2.87 in
0.12 in/hr
0.002 ft3/sec
0.026 ft3/sec
0.024 ft3/sec
22.2 ft3
24.0 ft3 OK
n/a ft3
_ ft3
_ ft3
n/a ft3
ft3
8 inches Insufficient ponding depth.
0.67 ft
40.0 ft2 OK
12 ft OK
4 ft Insufficient length
ft
12 hr OK
12 hr OK
24 hr
0.52 in/hr OK
2.00 in/hr OK
86% OK
10% OK
4% OK
Total: 100%
Parts I and 11. Design Summary, Page 1 of 2
Phosphorus Index (P-Index) of media
Basin Elevations
Temporary pool elevation
Type of bioretention cell (answer "Y" to only one of the two following
questions):
Is this a grassed cell?
Is this a cell with trees/shrubs?
Planting elevation (top of the mulch or grass sod layer)
Depth of mulch
Bottom of the planting media soil
Planting media depth
Depth of washed sand below planting media soil
Are underdrains being installed?
How many clean out pipes are being installed?
What factor of safety is used for sizing the underdrains? (See BMP
Manual Section 12.3.6)
Additional distance between the bottom of the planting media and the
bottom of the cell to account for underdrains
Bottom of the cell required
SHWT elevation
Distance from bottom to SHWT
Internal Water Storage Zone (IWS)
Does the design include IWS
Elevation of the top of the upturned elbow
Separation of IWS and Surface
Planting Plan
Number of tree species
Number of shrub species
Number of herbaceous groundcover species
Additional Information
UUUb VUIUIIIC III l:ALUbJ UI LIIC UUblylI VUIUIIIC UYPCIJJ LIIC UIUICLCIILIUII
-
Does volume in excess of the design volume flow evenly distributed
through a vegetated filter?
What is the length of the vegetated filter?
Does the design use a level spreader to evenly distribute flow?
Is the BMP located at least 30 feet from surface waters (50 feet if SA
waters)?
Is the BMP located at least 100 feet from water supply wells?
Are the vegetated side slopes equal to or less than 3:1?
Is the BMP located in a proposed drainage easement with access to a
public Right of Way (ROW)?
Inlet velocity (from treatment system)
Is the area surrounding the cell likely to undergo development in the
future?
Are the slopes draining to the bioretention cell greater than 20%?
Is the drainage area permanently stabilized?
Pretreatment Used
(Indicate Type Used with an "X" in the shaded cell)
Gravel and grass
(8'inrhes nravel fnllnwed by 3-5 ft of nrass)
Grassed swale
Forebay
Other
20 (unitless) OK
300.00 fmsl
N (Y or N)
Y (Y or N) Insufficient media depth
384.33 fmsl
2 inches OK
383.33 fmsl
1ft
a
Y (Y or N)
OK
2 OK
1ft
380.33 fmsl
375 fmsl
5.33 ft OK
N (Y or N)
fmsl
384.33 ft
0
0
3 OK
Y (Y or N) OK
Y (Y or N) OK
Permit Number:
(to be provided by DWQ)
Y (Y or N) Submit a level spreader supplement
Y (Y or N) OK
Y (Y or N) OK
Y (Y or N) OK
Y (Y or N) OK
ft/sec
N (Y or N) OK
N (Y or N) OK
Y (Y or N) OK
X
OK
Form SW401-Bioretention-Rev.8
July 30, 2009 Parts I and 11. Design Summary, Page 2 of 2
APEX QUADRANGLE
CO-
7.5-MINUTE 'BELIES (TOPOGRAPHIC)
Permit No
(to be assigned by DWQ)
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a
request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following
design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach
justification.
Pagel Plan
Initials Sheet No.
H. F. 1. Plans (1"- 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Cell dimensions,
Pretreatment system,
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW),
Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
H. F. 2. Plan details (1" = 30' or larger) for the bioretention cell showing
Cell dimensions
Pretreatment system,
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW),
Design at ultimate build-out,
Off-site drainage (if applicable),
Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
Indicate the P-Index between 10 and 30
H. F. 3. Section view of the bioretention cell (1" = 20' or larger) showing:
Side slopes, 3:1 or lower
Underdrain system (if applicable), and
Bioretention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media depth,
washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable), SHWT level(s),
and overflow structure]
H. F. 4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The results of the
soils report must be verified in the field by DWQ, by completing & submitting the soils investigation request form.
County soil maps are not an acceptable source of soils information. All elevations shall be in feet mean sea level
(fmsl). Results of soils tests of both the planting soil and the in situ soil must include:
Soil permeability,
Soil composition (% sand, % fines, % organic), and
P-index.
Note: Above ground bioretention 'terrace' does not require Specific permeability of
in Situ oollo.
H. F. 5. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing:
A variety of suitable species,
Sizes, spacing and locations of plantings,
Total quantity of each type of plant specified,
A planting detail,
The source nursery for the plants, and
Fertilizer and watering requirements to establish vegetation.
H. F. 6. An assurance that the installed system will meet design specifications upon initial operation once the project is
complete and the entire drainage area is stabilized.
H. F. 7. A construction sequence that shows how the bioretention cell will be protected from sediment until the entire
drainage area is stabilized. Note: Above ground bioretention 'terrace' will not be
H ouocepptable to Sediment contamination.
8. The supporting calculations (includii)g underdrain calculations, if applicable).
H. F. 9. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
H. F. 10. A copy of the deed restriction.
Note:thio to an existing lot predating the Neuoe
n SW401-Bioretention -Rev.7 reoulatlon6. Deed reotrlctlon does not apply. Part III, Page 1 of 1
35" 45' 00 "
ZONE E
.ONE AE
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the performance of
the maintenance procedures listed above. I agree to notify DWQ of any problems with the
system or prior to any changes to the system or responsible party.
Project name: Addition to Keoidence at 219 KirkField Drive, Ca
BMP drainage area number:
Print name: AohraPH.Allouba
Title: Owner
Address: 219 KirkField Drive
Phone: [phone]-
Signature:
Date: November , 2009
Cary, NC 27518
Note: The legally responsible parry should not be a homeowners association unless more than 50% of the lots
have been sold and a resident of the subdivision has been named the president.
I , a Notary Public for the State of
County of , do hereby certify that
personally appeared before me this
day of and acknowledge the due execution of the forgoing
bioretention maintenance requirements. Witness my hand and official seal,
SEAL
My commission expire
NC
Form SW401-Bioretention I&M-Rev. 2 Page 4 of 4
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Bioretention Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a log
in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity of
structures, safety of the public, and the removal efficiency of the BMP.
Important operation and maintenance procedures:
- Immediately after the bioretention cell is established, the plants will be watered
twice weekly if needed until the plants become established (commonly six weeks).
- Snow, mulch or any other material will NEVER be piled on the surface of the
bioretention cell.
- Heavy equipment will NEVER be driven over the bioretention cell.
- Special care will be taken to prevent sediment from entering the bioretention cell.
- Once a year, a soil test of the soil media will be conducted.
After the bioretention cell is established, I will inspect it once a month and within 24 hours
after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall be
repaired immediately.
BMP element: Potential problems: How I will remediate the problem:
The entire BMP Trash/debris is present. Remove the trash/debris.
The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to
bioretention cell erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a one-
time fertilizer application.
The inlet device: pipe, The pipe is clogged (if Unclog the pipe. Dispose of the
stone verge or swale applicable). sediment off-site.
The pipe is cracked or otherwise Replace the pipe.
damaged (if applicable).
Erosion is occurring in the Regrade the swale if necessary to
swale (if applicable). smooth it over and provide erosion
control devices such as reinforced turf
matting or riprap to avoid future
problems with erosion.
Stone verge is clogged or Remove sediment and clogged stone
covered in sediment (if and replace with clean stone.
applicable).
Form SW401-Bioretention O&M-Rev. 3 Page 1 of 4
BMP element: Potential problems: How I will remediate the problem:
The pretreatment area Flow is bypassing pretreatment Regrade if necessary to route all flow
area and/or gullies have to the pretreatment area. Restabilize
formed. the area after grading.
Sediment has accumulated to a Search for the source of the sediment
depth greater than three inches. and remedy the problem if possible.
Remove the sediment and restabilize
the pretreatment area.
Erosion has occurred. Provide additional erosion protection
such as reinforced turf matting or
prap if needed to prevent future
erosion problems.
Weeds are present. Remove the weeds, preferably by
and.
The bioretention cell: Best professional practices show Prune according to best professional
vegetation that pruning is needed to practices.
maintain optimal plant health.
Plants are dead, diseased or Determine the source of the problem:
dying. soils, hydrology, disease, etc. Remedy
the problem and replace plants.
Provide a one-time fertilizer
application to establish the ground
cover if a soil test indicates it is
necessary.
Tree stakes/wires are present Remove tree stake/wires (which can
six months after planting. kill the tree if not removed).
The bioretention cell: soils Mulch is breaking down or has Spot mulch if there are only random
and mulch floated away. void areas. Replace whole mulch
layer if necessary. Remove the
remaining much and replace with
triple shredded hard wood mulch at a
maximum depth of three inches.
Soils and/or mulch are clogged Determine the extent of the clogging -
with sediment. remove and replace either just the top
layers or the entire media as needed.
Dispose of the spoil in an appropriate
off-site location. Use triple shredded
and wood mulch at a maximum
depth of three inches. Search for the
source of the sediment and remedy the
problem if possible.
An annual soil test shows that Dolomitic lime shall be applied as
pH has dropped or heavy recommended per the soil test and
metals have accumulated in the toxic soils shall be removed, disposed
soil media. of properly and replaced with new
lantin media.
Form SW401-Bioretention O&M-Rev. 3 Page 2 of 4
BMP element: Potential problems: How I will remediate the problem:
The underdrain system (if Clogging has occurred. Wash out the underdrain system.
applicable)
The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of
the sediment off-site.
The drop inlet is damaged Repair or replace the drop inlet.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality 401 Oversight Unit at
outlet. 919-733-1786.
Form SW401-Bioretention O&M-Rev. 3 Page 3 of 4
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the performance of
the maintenance procedures listed above. I agree to notify DWQ of any problems with the
system or prior to any changes to the system or responsible party.
Project name:
BMP drainage area number:
Print name:
Title:
Address:-
Phone:-
Signature:
Date:
Note: The legally responsible parry should not be a homeowners association unless more than 50% of the lots
have been sold and a resident of the subdivision has been named the president.
I , a Notary Public for the State of
County of , do hereby certify that
personally appeared before me this
day of , and acknowledge the due execution of the forgoing
bioretention maintenance requirements. Witness my hand and official seal,
SEAL
My commission
Form SW40 I -Bioretention I&M-Rev. 2 Page 4 of 4
xample City,
Precipitation Data Chart From: http://hdsc.nws.noaa.gov/hdsc/pfds/
I Precipitation Frequency Estimates (inches)
AR1*
(years) 5
min 10
min 15
min 30
min 60
min 120
min 3
hr 6
hr 12
hr 24
hr 48
hr 4
day 7
day 10
day 20
day 30
day 45
day 60
day
1 0.36 0.58 0.99 1.23 1.44 1.55 1.95 2.46 2.98 3.58 4.04 4.68 5.37 7.16 8.87 11.2 13.32
2 0.43 0.69 0.86 1.19 1.49 1.75 1.88 2.35 2.97 3.62 4.32 4.87 5.6 6.4 8.48 10.4 13.09 15.53
5 0.51 0.81 1.03 1.46 1.88 2.22 2.38 2.95 3.69 4.59 5.44 6.05 6.83 7.7 10 12 14.82 17.45
10 0.57 0.91 1. 6 1.67 2.18 2.6 2.79 3.44 4.26 5.36 6.31 6.97 7.78 8.68 11.2 13.2 16.11 18.89
25 0.65 1.04 1.32 1.95 2.6 3.15 3.4 4.15 5.06 6.42 7.51 8.23 9.06 9.97 12.8 14.8 17.75 20.72
50 0.71 1.14 1.44 2.17 2.94 3.61 3.9 4.75 5.71 7.28 8.47 9.23 10.1 11 14 15.9 18.97 22.08
100 0.78 1.24 1.56 2.4 3.3 4.1 4.45 5.39 6.38 8.16 9.46 10.2 11.1 12 15.3 17 20.13 23.37
200 0.84 1.34 1.69 2.63 3.68 4.62 5.06 6.1 7.1 9.09 10.5 11.3 12.1 13 16.5 18.1 21.26 24.61
500 0.93 1.47 1.85 2.94 4.22 5.4 5.95 7.12 8.11 10.4 11.9 12.7 13.4 14.3 18.1 19.5 22.69 26.18
1000 1 1.57 1.97 3.2 4.67 6.05 6.7 7.99 8.94 11.4 13 13.8 14.5 15.3 19.4 20.5 23.74 27.33
Intensity, Peak 10-yr, 24-hr
d(in)/24hr
Depth at 24hr& 10-yr: d= 0.21 in/hr
5.04 in
Intensity, Peak 1-yr, 24-hr
d(in)/24hr 0.12 in/hr
Depth at 24hr& 1-yr: d= 2.87 in
Intensity, Peak 10-yr
d(in)/t,(min)*60(min/hr) 7.20 in/hr
Depth at T.& 10-yr: d= 0.60 in
Intensity, Peak 1-yr
d(in)/t,(min)*60(min/hr) 7.71 in/hr
Depth at T.& 1-yr: d= in
Time of Conc.: Tc= 5.00 min
Hydraulic Length, L 56 ft
Change in Elev., H 3 ft
time of concentration to determine the "1-yr" storm, but not the "1-yr, 2.
storm. Note that the "1-yr, 24-hr" value discussed here is the regulated
(Calculate this value from the hydraulic length and the change in elevation along
the hvdraulic lenoth)
Furthest distance water flows to BMP
Over hydraulic length (Example Site)

FJredprtatian Frequency Estimates (,ncties)
2I[ 1U T 3U (iU
12U 12
- Fill !a In -
lU 2U?
U 3 FU
24 In FA 3 In day 7 day
F
}°ears} rain min min rain min nil, lir da} day day
zdav
F i 0-40 0.64 0..80 1 J 0 F3 7 1 .60 1.69 2.04 2.41 2_S7 3.32 371 4.30 4.91 6.57 X5.16 10.40 12.4 #s
0.47 0:75 0.94 1.30 1.64 1.92 2.03 2.44 2.89 3.46 3-99 4.45 5.14 5.84 7:76 9.60 12.19 14.}6
0.54 0.87 1.10 1 .56 2.00 2.36 2.51 3.02 3.58 435 4.97 5.49 6.25 7.02 9.17 1 1 .17 13.95 16.47
F TO 0.60 0.96 1.22 1,76 2.29 273 2.92 3.52 4.20 5.04 5.74 631 7.14 7.94 10.28 12.35 15.31 17.94

25 0.66 1.06 1.34 1 .98 2.64 3-18 3.45 4-1 S 5.01
F
5.9 5 6 78 7.43 X36 9-19 1 1 79 13-9s 17.07 19.53
S
F U 0.71 1.13 1 .43 2.J 5 2.91 3-55 3.#s9 472 571
6.73 7.59 X5.32 9.32 10.17 12.97 15.21 1 X5.41 21 .25
lUU 0.75 1-19 1.50 2.30 3.17 3-91 4.32 5.27 6.41 7.50 X5.43 9-22 1031 11.16 J4.J6 16.43 1972 22.61
2U0 078 1.24 1.56 2.44 3.42 4-26 4.77 5.84 7.16 8.26 9.29 10.1.5 1132 12.16 15.37 17.65 21.00 23.95
X
F 00 0.82 1.30 1-63 2.60 3.73 472 536 6.61 8.18
9.36 10.46 1 1.42 12.70 13.52 17.01 19.27 22.68 25.67
100U 0-ASS 1.34 1.68 2.72 3..97 5.09 5.#sb 7.25 9..05 10.21 1 1.37 12.42 13°79 14.58 15.27 20.51 23 ..94 26.96

a:al1-Ya-2 ra-?-- aa--2 aPd o7a:a-:ad 3-a:c7ia -asARla-naku-agaR-2-:j--a7 "ii-- -;a
P?IN1 PRE?IP TAT ?N `?'M?
FRE??EN?YE?IMAIES ??
RUNUP u? ?r
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11,11.1 vija

JOB: PEAK DISCHARGE SUMMARY
Allouba:219 Kirkfield Dr. Cary, NC
H. P.
DRAINAGE AREA NAME: Proposed Conditions-addition site 2-Sep-09

COVER DESCRIPTION
SOIL NAME GROUP
A,B,C,D? CN from
TABLE 2-2 AREA
(In acres)
Turf Areas Cecil sandy loam B 61
Roof Area 98 0.01 Ac.

AREA SUBTOTALS: 0.0066 Ac.
Percentage Impervious: 100.0%
Surface Cover Manning 'n' Flow Length Slope
2-Yr 24 Hr Rainfall = 3.5 In Cross Section Wetted Per Avg Velocity Tt (Hrs)
Sheet Flow dense grass 'n'=0.01 24 Ft. 15.50%
0.00 Hrs

Shallow Flow UNPAVED

Channel Flow
Hydraulic Radius =0.75
X-S estimated 'n'=0.035
WP estimated 14 Ft.
4.58 F.P.S. 1.70%
0.00 Hrs.

Total Area in Acres = 0.01 Ac. Total Sheet Total Shallow Total Channel
Weighted CN = 98 Flow= Flow= Flow =
Time Of Concentration = 0.10 Hrs. 0.00 Hrs. 0.00 Hrs. 0.00 Hrs.
Pond Factor = 1 RAINFALL TYPE II

STORM Precipitation
(P) inches Runoff
(Q) Qp, PEAK
DISCHARGE TOTAL STORM
Volumes
1 Year
2 Year
5 Year
10 Year
25 Year
50 Year
100 Year 2.87 In.
3.46 In.
4.35 In.
5.04 In.
5.98 In.
6.73 In.
7.50 In. 2.6 In.
3.2 In.
4.1 In.
4.8 In.
5.7 In.
6.5 In.
7.3 In. 0.027 CFS
0.034 CFS
0.043 CFS
0.050 CFS
0.060 CFS
0.067 CFS
0.075 CFS 63.1 Cu. Ft.
77.2 Cu. Ft.
98.4 Cu. Ft.
114.9 Cu. Ft.
137.3 Cu. Ft.
155.2 Cu. Ft.
173.6 Cu. Ft.

JOB: PEAK DISCHARGE SUMMARY
Allouba:219 Kirkfield Dr. Cary, NC
H. P.
DRAINAGE AREA NAME: Existing Conditions-addition sit e 2-Sep-09

COVER DESCRIPTION
SOIL NAME GROUP
A,B,C,D? CN from
TABLE 2-2 AREA
(In acres)
Turf Areas Cecil sandy loam B 61 0.0066 Ac.
Roof Area 98

AREA SUBTOTALS: 0.0066 Ac.
Percentage Impervious: 0.0%
Surface Cover Manning 'n' Flow Length Slope
2-Yr 24 Hr Rainfall = 3.5 In Cross Section Wetted Per Avg Velocity Tt (Hrs)
Sheet Flow dense grass 'n'=0.01 24 Ft. 15.50%
0.00 Hrs

Shallow Flow UNPAVED

Channel Flow
Hydraulic Radius =0.75
X-S estimated 'n'=0.035
WP estimated 14 Ft.
4.58 F.P.S. 1.70%
0.00 Hrs.

Total Area in Acres = 0.01 Ac. Total Sheet Total Shallow Total Channel
Weighted CN = 61 Flow= Flow= Flow =
Time Of Concentration = 0.10 Hrs. 0.00 Hrs. 0.00 Hrs. 0.00 Hrs.
Pond Factor = 1 RAINFALL TYPE II

STORM Precipitation
(P) inches Runoff
(Q) Qp, PEAK
DISCHARGE TOTAL STORM
Volumes
1 Year
2 Year
5 Year
10 Year
25 Year
50 Year
100 Year 2.87 In.
3.46 In.
4.35 In.
5.04 In.
5.98 In.
6.73 In.
7.50 In. 0.3 In.
0.6 In.
1.0 In.
1.4 In.
2.0 In.
2.5 In.
3.1 In. 0.002 CFS
0.005 CFS
0.010 CFS
0.014 CFS
0.020 CFS
0.025 CFS
0.031 CFS 7.6 Cu. Ft.
13.3 Cu. Ft.
23.8 Cu. Ft.
33.3 Cu. Ft.
47.6 Cu. Ft.
60.0 Cu. Ft.
73.4 Cu. Ft.

JOB: PEAK DISCHARGE SUMMARY
Allouba:219 Kirkfield Dr. Cary, NC
H. P.
DRAINAGE AREA NAME: Existing Conditions-entire drainage area 2-Sep-09

COVER DESCRIPTION
SOIL NAME GROUP
A,B,C,D? CN from
TABLE 2-2 AREA
(In acres)
Turf Areas Cecil sandy loam B 61 0.1081 Ac.
Roof and Pavement Areas 98 0.03 Ac.

AREA SUBTOTALS: 0.1360 Ac.
Percentage Impervious: 20.5%
Surface Cover Manning 'n' Flow Length Slope
2-Yr 24 Hr Rainfall = 3.5 In Cross Section Wetted Per Avg Velocity Tt (Hrs)
Sheet Flow
(a) dense grass 'n'=0.24 35 Ft. 5.00%
0.07 Hrs

(b) dense grass 'n'=0.240 75 Ft. 15.20%
0.08 Hrs
Shallow Flow UNPAVED

Channel Flow
Hydraulic Radius =0.75
X-S estimated 'n'=0.035
WP estimated 14 Ft.
4.58 F.P.S. 1.70%
0.00 Hrs.

Total Area in Acres = 0.14 Ac. Total Sheet Total Shallow Total Channel
Weighted CN = 69 Flow= Flow= Flow =
Time Of Concentration = 0.15 Hrs. 0.15 Hrs. 0.00 Hrs. 0.00 Hrs.
Pond Factor = 1 RAINFALL TYPE II

STORM Precipitation
(P) inches Runoff
(Q) Qp, PEAK
DISCHARGE TOTAL STORM
Volumes
1 Year
2 Year
5 Year
10 Year
25 Year
50 Year
100 Year 2.87 In.
3.46 In.
4.35 In.
5.04 In.
5.98 In.
6.73 In.
7.50 In. 0.6 In.
0.9 In.
1.5 In.
2.0 In.
2.7 In.
3.3 In.
3.9 In. 0.099 CFS
0.160 CFS
0.266 CFS
0.359 CFS
0.495 CFS
0.610 CFS
0.733 CFS 296.9 Cu. Ft.
459.2 Cu. Ft.
740.4 Cu. Ft.
980.8 Cu. Ft.
1,331.6 Cu. Ft.
1,626.3 Cu. Ft.
1,939.5 Cu. Ft.

JOB: PEAK DISCHARGE SUMMARY
Allouba:219 Kirkfield Dr. Cary, NC
H. P.
DRAINAGE AREA NAME: Proposed Conditions-entire drainage area 2-Sep-09

COVER DESCRIPTION
SOIL NAME GROUP
A,B,C,D? CN from
TABLE 2-2 AREA
(In acres)
Turf Areas Cecil sandy loam B 61 0.1015 Ac.
Roof and Pavement Areas 98 0.03 Ac.

AREA SUBTOTALS: 0.1360 Ac.
Percentage Impervious: 25.4%
Surface Cover Manning 'n' Flow Length Slope
2-Yr 24 Hr Rainfall = 3.5 In Cross Section Wetted Per Avg Velocity Tt (Hrs)
Sheet Flow
(a) dense grass 'n'=0.24 35 Ft. 5.00%
0.07 Hrs

(b) dense grass 'n'=0.240 75 Ft. 15.20%
0.08 Hrs
Shallow Flow UNPAVED

Channel Flow
Hydraulic Radius =0.75
X-S estimated 'n'=0.035
WP estimated 14 Ft.
4.58 F.P.S. 1.70%
0.00 Hrs.

Total Area in Acres = 0.14 Ac. Total Sheet Total Shallow Total Channel
Weighted CN = 70 Flow= Flow= Flow =
Time Of Concentration = 0.15 Hrs. 0.15 Hrs. 0.00 Hrs. 0.00 Hrs.
Pond Factor = 1 RAINFALL TYPE II

STORM Precipitation
(P) inches Runoff
(Q) Qp, PEAK
DISCHARGE TOTAL STORM
Volumes
1 Year
2 Year
5 Year
10 Year
25 Year
50 Year
100 Year 2.87 In.
3.46 In.
4.35 In.
5.04 In.
5.98 In.
6.73 In.
7.50 In. 0.6 In.
1.0 In.
1.6 In.
2.1 In.
2.8 In.
3.4 In.
4.0 In. 0.108 CFS
0.171 CFS
0.280 CFS
0.375 CFS
0.514 CFS
0.631 CFS
0.756 CFS 317.6 Cu. Ft.
485.6 Cu. Ft.
774.4 Cu. Ft.
1,020.1 Cu. Ft.
1,377.2 Cu. Ft.
1,676.4 Cu. Ft.
1,993.7 Cu. Ft.
Minor Variance Request for Neuse River Basin: Nutrient Sensitive Waters
Management Strategy Protection and Maintenance of Riparian Areas Rule
Addition to Residence at 219 Kirkfield Drive, Cary, NC 27518
Supplemental Information
Part 3: Stormwater
Maintenance of diffuse flow through riparian buffer
Note that the existing riparian buffer at this
location is actually the landscaped back yards
of the single family housing subdivision that
pre-dated the Neuse Riparian Area Rule. As
seen on the proposed Bioretention Plan, the
proposed masonry raised bioretention `terrace'
is of equal width as the proposed addition to
the residence, each perpendicular to the
direction of runoff flow. Therefore, the 10 ft.
width outlet level spreader of the bioretention
`terrace' provides dispersion equal to the width
of the runoff area captured by the roof of the
proposed addition. The existing thick turf in
excellent condition of Zones 1 & 2 of the
i

`
r k

nca# aserhang

I 1 ?•?r ?E?G.J ]P. f:.

] _
~
I [ 1G'x24'rcaaEeaAC.'.3nkitn
12" -+a cv €-ara ;crdq) s-d 3' u:n-,o•a

Neuse buffer zone will be maintained to
provide additional diffusion and filtration of runoff.
Part 4: Proposed Impacts and Mitigation
The area of disturbance of the proposed addition to the residence impacts 266.5 sq. ft., all within
Zone 2 of riparian buffer. The resultant required mitigation area of 400 sq. ft. requires planting of
3 new trees, at the required rate of 320 trees per acres. As shown on the proposed Bioretention
Plan, 3 trees, suitable as riparian buffer species, are proposed to be planted- 2 Sourwood (g.
Oxydendrum), and 1 Serviceberry, (g. Amelanchier).
Stormwater treatment of rooftop runoff from the proposed residence addition is accomplished by
an above ground masonry construction bioretention area, described in the NCENR Stormwater
Best Management Practices manual as a Bioretention Terrace. The `Terrace' is located above the
Zone 2 of the Neuse buffer, and employs an 8 inch storage zone, a masonry level spreader for
stormwater overflow, a high infiltration soil mix over a sand layer, surrounded by geotextile, and a
combination of masonry `weeps' and an underdrain for non-infiltrated drainage. According to the
BMP manual, bioretention provides 85% removal of Total Suspended Solids; 35% removal of
Total Nitrogen, and 45% removal of Total Phosphorus.
9 The t_n'ies phase Fiictior
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Driving directions:
.219 Kirkfield Dr. 1433 14'9 4?'
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in ;Cary, NC acrd - 1433 ?.zs-,
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APEX QUADRANGLE
:NORTH CAROLINA-WAKE CO.
7.5-MINUTE SERIES (TOPOGRAPHIC)
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220 OOD
METERS
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31
U.S.G.S. Quad Sheet (enlarged)
k"for 219 Kirkfield Dr.
Cary, NC