20070641 Ver 1_More Info Received_20070517

i
WITHERS t ? R"ENEL
ENGINEERS I PLANNERS I SURVEYORS
May 16, 2007
North Carolina Department of Environment and Natural Resources
Division of Water Quality
2321 Crabtree Boulevard, Suite 250
1650 Mail Service Center
Raleigh, North Carolina 27699-1650
Attn: Cyndi Karoly
Re: Dunhill Subdivision (DWQ 07-0641)
Response to Review Comments
Ms. Karoly,
?qY
rReery
In response to the comments received in a letter dated May 11, 2007 on the above referenced
project, we offer the following responses:
1. The runoff and ditch velocity calculations for the 2 discharge points into wetlands are
attached as requested.
2. Bioretention
a. The completed DWQ Bioretention Worksheet for BMP#1 is attached as requested.
b. The underdrain for BMP#1 (Bioretention) has been added to the plan and more
detailed on Sheet 8 as requested.
c. A planting plan for BMP#1 for the Bioretention Area is provided on Sheet 8 as
requested.
d. Soil Specifications have been added in a table provided on Sheet 8 as requested.
e. References to Pine Straw Mulch have been replaced with Double Shredded
Hardwood Mulch, and a specification added in the aforementioned table on Sheet 8
as requested.
f. The Common Name for Myrica cerifera has been changed to Wax Myrtle as
requested.
3. Level Spreader
a. The completed Level Spreader Worksheet is attached as requested.
b. The forebay requested for the Level Spreader is incorporated into the splitter box by
providing a 1' sump (bottom elevation of 433.00) below the invert in (434.00) The
invert out (8" DIP) to the Level Spreader is at elevation 435.00) and the weir to the
bypass channel is at elevation 435.70.
c. The grading for the Level Spreader has been shown on Sheets 5 & 8 as requested.
4. The pipe/ditch network for the subdivision is shown on Sheet 5 as requested.
iii MacKenan Drive i Cary, North Carolina 27511 1 tel: [phone] fax: [phone] i www.withersravenet.com
7040 Wrightsville Avenue, Suite 101 i Wilmington, North Carolina 28403 1 tel : [phone] fax : [phone]
1027 Sabbath Home Road SW i Supply, NC 28462 1 tel: [phone] fax: [phone]
WITHERS RAVENEL
ENGINEERS I PLANNERS I SURVEYORS
We trust this information satisfies the Division's review comments and we look forward to your
anticipated approval. If you have any questions or addition questions, please feel free to give us
a call.
Best Regards,
WITHERS &-RAVENEL, INC.
Ch s Johnson, P.E.
cc: Jeff Aiken, Dunhill, LLC
Troy DeHaven, Landquest Development
Attachments:
Drainage Calculations for discharge to wetlands
Bioretention Worksheet
Bioretention Sizing Spreadsheet
Level Spreader Worksheet
Plan Sheets 5, & 8
Page 2 of 2

DWQ Project No. 07-064
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET (112007)
1. PROJECT INFORMATION (please complete the following information):
Project Name : Dunhill Subdivision
Contact Person: Chris Johnson PE Phone Number: [phone]
Level Spreader ID: tR 800
Level Spreader Length 44 ft.
Drainage Area 0.86 ac.
Impervious Area 0.34 ac.
Forebay Area 16 SF cu ft.
Maximum Filter Strip/Buffer Slope 8 %
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(0.2% of the contributing impervious surface area)
(6% for forested/leaf littler cover, 8% for grass/thick cover)
Max. Discharge from 1"/Hr Storm 0.39 cfs
Max. Discharge to Level Spreader 1.02 (Q10) cfs (DisGhaFge rate from extended detentieR wetland oF pond)
Filter Strip/ Zone 1 Buffer Vegetation grass (Grass/Thick ground cover or Forested)
Filter Strip/ Zone 1 Buffer Width 20' ft.
Filter Strip/ Zone 2 Buffer Vegetation grass/thick ground cover (unmaintained)
Filter Strip/ Zone 2 Buffer Width 30' ft.
Bypass Method Used spliiter box /weir Please include a worksheet for this.
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is
attached. If a requirement has not been met, please explain why. At a minimum, a complete stormwater management plan
submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet
structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and approval of
the project.
Applicants Initials
C1%
C
Project Site was visited prior to designing level spreader system.
Date of the Site visit. Please attach time-dated digital photos of existing buffer conditions.
Level spreader length is at least: 13 ft. per cfs for thick ground cover / grass; OR 65 ft per cfs for 50-
foot canopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer; 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the buffer/filter strip).
All ground cover types and their widths have been labeled on the construction plans.
All contours have been depicted on the construction plans.
No structures are located in protected buffers (must meet no practical alternatives criteria).
No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
Construction details for the level spreader have been provided.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
co, Bypass conveyance method is specified and construction details and calculations are provided.
Alternative design option is specified and plan details and calculations are provided.
Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
44 bypass discharge.
Construction details for the bypass and outlets are
provi ed.
• , ., r I.
discharge to level spreader (1" storm) - SB# 800

Project Description
Solve For Headwater Elevation
Input , Data
Discharge 0.39 ft3/s
Centroid Elevation 435.50 ft
Tailwater Elevation 435.53 ft
Discharge Coefficient 0.60
Diameter 8.00 in
Results
Headwater Elevation 435.58 ft
Headwater Height Above Centroid 0.08 ft
Tailwater Height Above Centroid 0.03 ft
Flow Area 0.35 ft2
Velocity 1.12 ft/s
Bentley Systems, Inc. Haestad Methods Solution Center FlowMaster [08.01.058.00]
511712007 10:42:34 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
DWQ Project No. 07-0641
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
1. PROJECT INFORMATION (please complete the following information):
Project Name: Dunhill
Contact Person: Hunter Freeman. PE Phone Number: [phone]
For projects with multiple basins, specify which basin this worksheet applies to:
Permanent Pool Elevation
Temporary Pool Elevation
Bioretention Surface Area
Drainage Area
Impervious Area
Rational C Coefficient
Size %
Inlet Velocity
Inlet flow depth
Depth to Groundwater
Planting Soil Infiltration Rate
In-Situ Soil Infiltration Rate
N/A ft.
436.00 ft.
2367 sq. ft.
4.04 ac.
1.62 ac.
0.42
1.35 %
5.9 fps
4.6 in.
6' ft.
>0.6 in/hr
0.6-2.0
II. REQUIRED ITEMS CHECKLIST
(elevation of the orifice invert out)
(elevation of the outlet structure invert in)
(on-site and off-site drainage to basin)
(on-site and off-site drainage to basin)
(either 5% in w/sand underdrain or 7% in w/o)
(Sized by Volume. See Attached Documentation)
(the soil layer down to 4 feet) (Specification on Plan)
(the soil layer below 4 feet or below the sand bed) (from Soil Survey)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes a
worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage
plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional
information and will substantially delay final review and approval of the project.
No vertical sand bed is proposed (See Sheet 8)
The bioretention area is at least 40 feet by 15 feet. (25'x 94.6, See Sheet 8)
Sheet flow is provided at inlet.
Water table depth is greater than 6 feet.
Minimum of 6" ponding is provided. (435.50.436.00)
The ponded area will draw down in less than 4 days.
Planting soil infiltration rate is greater than 0.52 in/hr. (Specification >0.6 on Plan)
The in-situ soil infiltration rate is greater than 0.2 in/hr. (from Soil Survey)
A planting plan with species and densities provided. (See Sheet 8)
Mulch layer is specified in plans. (Specifications on Plan(Double Shredded Hardwood))
Planting soil meets minimum soil specifications (NCDENR Stormwater Best Management
Practices Manual, April 1999)
Plan details for the bioretention area provided. (See Sheet 8)
Plan details for the inlet and outlet are provided. (See Sheet 8)
An operation and maintenance agreement signed and notarized by the responsible party is provided.
Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains
Dunhill Subdivision
Revised 14 May, 2007

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PROJECT NAME. Dv4iB OJECT NO.. 02060260.00
FROM STATION/REACH? Endof R002 TO STATION/REACH. WETLANDS RAINAGE AREA 7.86 ESIUN FREQUENCY
HYDRAULIC RESULTS
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Period hs elocily[fps Area[scLfl) Hydaukc
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Staple Pattern Phasa Cla:s Type Dem1y Shen Sties
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(pst)
Straight Urcenlaced Vegetation C M& 50-75X 4.20 0.96 4.35 STABLE
Soi Sardy Loam 0,035 0.011 3.09 STABLE
Hack to Input Screen
Nath American Green - ECMDS Version 4.3 102007 1:11 AM COMPUTED BYE bgb/CSJ
PROJECT NAME. ovrhil PROJECT NO.. 02060260.00
ROM STATION/REACH. End of R001 TO STATION7REACK WETLANDS @ RAINAGE AREA: 7.86 ESIGN FREQUENCY: 5-YEAR
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w LNN ERS PLANNERS SURVEYOR] '- ri• y� i ♦ "
I 111 NlacKenan Drive Cary, North Carolina
telephone: [phone] wwvr.vAthersravenel.com -+�+j «. 1, l
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1 C.O.R. 1ST REVIEW COMMENTS 4/05/07 BGB Drawn By Date DUNHILL, PHASE 1 I STORM D RAII RALEIGH, WAKE COUNTY, NORTH CAROLINA ENGINEERS I PLANNERS I SUF INAGE & GKADINU FLAN SURVEYORS
MFC/BGB APRIL 2007 ° a 111 MacKenan Drive Cary, North Carolina 27511 tel: [phone] fax: [phone] )-467-6008 www.withersravenel.com
N LPi Checked By Job No. ° BGB/CSJ 2060260.00
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I I
I TOP OF DIKE 437.50 PRECA SEE D SEE PLANTING SCHEDULE PRECAST TOP SLAB W/ GRATE
f F r t ~ - r ~ SEE DETAIL BELOW
J ~ 'y~ i
,..r-'"'"'""" r ~ 4" CLEANOUT PLUG AT LEFT e , p VOID SPACE - 4'X4' PRECAST RCP BOX
i ~ ~
d le ~ y ~ ~ WEIR CREST 436.00 , . 6" MINIMUM o .
.r ~ 4 5.
. ~._r-- g MCE
::.x„ II ' g LBE e. ~
h v.. / r I IGL \
\ , / ~ ,N,,.. ~i PLANTING BED e, JOINT SEA ~ j M1_A GASKET C 48 JT SEALED WITH A -LOCK NEOPRENE >KET CAST IN MANHOLE WALL
~ ~ ~ .._...W._.....--- ~ ~
„ ~ _ ~ 1., ego ° ' GROUT EA 4" PERFORATED PIPE e ?UT EACH SIDE
I ~ ~ i ~ ` ~ " ti w
` ~ ` ~ ~ 1 ~ 431.50 ~e INV. 430.50
~ \ / ~ 1 . 24" 'O-RIN 90° BEND ' 12" GRAVEL BED CLAS O 430.50 . i i i i i i i i i i i i i i i i~ Q. 'O-RING' GASKETED
~ , 3SED SWALE ' ` ~ ~ti~ SE WIDTH ~ ~ . Q CLASS III RCP DISCHARGE
~ ti ~ '4""" ~ ~ ~ ~ i \ ~ ~ • 16E SLOPES
~ ..w..,. ~ ~ ~ ~ \ .r" \ \ ~ \ ~ O SLOPE ~ - ~ • ~ ~ ~ ~ ~ ~ GROUT 6" r 611
E~E~741L"C" BELOW) ~ ,
' ~ ~ , ,
r..~ ~ \ i LANDSCAPE MAINTENANCE - BIORETENTION AREAS
~ BTH
I 1 \ ~ ~ ~ ~ ~ ~ S 1 ~ ~ ~ PLANT BEDS AND SMALL ORNAMENTAL TREES ARR ~ ~ , , BIORETENTION OUTLEfi DEVICE DETAI tes :TAIL
~ ~ ~ t ~ ~ \ 1 • ~ ~ 1 \
~ ~ ~ ~ ~ i ~ ~ ~ ~ ~ ~ 1)ALL PLANT BEDS WILL BE SPRAYED AND WEEDED BY HAND
i TO MAINTAIN THEM FREE OF WEEDS AT ALL TIMES. Bioretention Material S ecifications n~ ` Material S ecification Size Notes 2 ALL SHRUBS WILL BE FERTILIZED AS REQUIRED WITH A SLOW-
~ ~ ~ ; , ~ Plantings Native vegetation 1' minimum tree Plantings are RELEASE FERTILIZER AT A RATE ACCORDING TO PLANT TYPE. diameter intings are site-specific
~ ~ ~ l I + ' ~ \ 3)ALL TREES WILL BE FERTILIZED BY DEEP ROOT FEEDING WITH A planting soil (4'deep) sand - 85-88 percent n~a Low P-Index
~ , - ,,~..w.... I i ~ e ~ / SLOW-RELEASE FERTILIZER DESIGNED TO FEED FOR TWO YEARS. optima) nee ~ 4)ALL SHRUBS AND TREES WILL BE PRUNED WITH HAND PRUNERS clay -less than 5 percent phosphorus w P-Index Soils (20 to 40 timal) needed in
, ~ ` ~sphorus ~sitive woodsheds ~4 REBAR 12"
~ \ / TO ENCOURAGE GR0INTH AND REMOVE DEAD MATERIAL. sensitive wo compost - 3-5%
\ ~ ~ .'J i, ~ ~ ~ ~ 5) REPLACE DOUBLE SHREDDED HARDWOOD MULCH ANNUALLY. organic Matt 6)AN I.P.M. (INTEGRATED PEST MANAGEMENT) PROGRAM WILL Minimum ~nfi~tration rate = genic Matter recommended GRATE OFFSET OVER STEPS O.C. EACH WAY 112" P FILL ed 6 months, minimum ~ 112" PREFORMED JOINT
BE ESTABLISHED AND IMPLEMENTED. o.s in~hr FILLER, 12" WIDE
• i ~ y ~5. ydt p ~q L' ;ke,lli: a~ : ti' is;"",J £r . ,sa ' ki :3 ,.,M j. tY i iYS,fi fx' -,5y,' £YS '1 ys f Mulch Coarse shredded hardwood Aged 6 mont LEAVES rep~aced t-2 placed t-2 times annually
5 ~ £ . ;~:G s S" s , ...-,,,.,,,.,.:ri-'~. ~ tie ti - ,si. , , 3 , ` ~ yy..Flyi'sS5'3 5 Y ~ +d `r i di} r d'k5 s. ~s3 4k 95' 1:~ d ~ °~Y~~~+£a~s~r..f g °,s.-. Y;.. ~aysd.;~k3i ..;£;a;. :;•~i,~€sr„~ i, 1i....;..~;~'~~~, ~,~,y;r , € 1 "r. ruse as necessary
u,';xi;; ps 'w d ~:4;j •3 ~.~k y y~. ~ a E€•,5r,;•aY,?3~.4seD~,%'{y T s. . y i ~s J,. SS; 5~.5. d~ ~ ~5r 155; ~ 4,,~ .;a~~ jk_d ~ taY ~ 3,,c ~53~ 3 1 ,;,3s;1 ^'€~~r£; i5~a,j:€, s~ Yy,. ;j 'Ls'a 4~ 54 s; i4Y1~ s~ 5! , i a£: Y:,., s}•;•,i..i ^ s3s s• ~*,u2„ t.. ~C~7, A t7 ~ : fig 5 i~.``. ~'`5,~.,. f YY { { j,,f~y ~ e $ ~Iy y 5 !f i te9 ; £ 1' isi~ii . ~rR..y,., •€si~f:. 3.. ~ w,, 3 4. ~ 5r~ldX?5 3. ~b {I~ f ~"f ~t`.w a'f2Y "Y. a 8 ?j ~ 8f3"Yj ;i~d. $ ~i ; 3' ~7. i T 1) ALL FALLEN LEAVES WILL BE REMOVED FOUR TIMES AYEAR FROM ~eotext~~e cuss '9 • -apparent n~a For use as n ~ THE PLANT BEDS. LEAVES MAYBE PLACED IN ADJACENT WOODED s ien(ASTM-D-4751), grab underdhains AREAS. ~e~s~ie scre~9m ~nsrM-o- neath
~,J. , s~.~ 7 s i4'. i a~ S 5ii"~':~~ iQ 5 3 d i ga,~ ~ 5 1 1 w ~;f f•••" s .~5a "v z ~t ~~i `~35' g~J~€.!3S'Y Y. t L5'd t, I' y i' ~ ~ ~ k ~5r5•E. sH;~ea::Y• «~,u~~y H U . ~ :.a~ ~ .i ~.y, ....isa3^S,,,sy; }ukar sl•'~ •.i a x.2~• , t 3 ~ ` ~ ~f Y~~.:~ .t 4; Y. 363i.. ~f t„ ~k~I' 1 y s,,3jt ~,y~,.s?~ i,' 7£.~~ ,fi35.. '.d L q, ~ ' 3 derdrains only
£'o >r~' _£"'kb;3.; t, YYi °eii.:, 3'f. :'4. / r' q 5 ~ y~y•:y~,~=,y~k7 ~ ~ ~;3. i fi ~~dgy''1 ~e it i : 3y~ i~ > ~ y .t ~ t ))i: .4 i;i.i:ia,. i. 3s; './>f .-~'i ,a,4'.X;t. r. ~f \ ~ 1 1 4632), puncture resistance
€~'h ;'3 ds u .3,53~`,x?y? T k• s PyA~~b 3i -~s,~A ~ x ~ qk. ~,~yfJ}y~~~, njJ£. 4~`i b . r "~fo. slyy. x ~'~i! d. ~ i l i sds ~ `k'k~3I i~ ~ edS~j£ r 3/~~ 5 a 5.~Y, r 4. }rt5. s ak{aSS~ - Xafiw 3i.Y~%; 5'9; £ ~ e.,:. (~•;•a~'y NATURALAREAS (ASTM-D-4833) 6" PRECAST CONCRETE
u 3iY;~3~ .4.?it~£ J '..i ~~.p:$' y 3 € 1 ..w. tap Kr `'9., rz5 y i s t '1155+33 qy.~'. t`1~.>. I , s3,Y; sd89 3~ ya is~ y5 Y5 nk?k ,a 5. ...;?,,,:...'t ^o ifs.::~.:?.s.Y;S.. - :.~yy 3 1) NATURALAREAS WILL BE MAINTAINED FREE OF BRUSH AND Underdrain gravel Washed 57. A 2• ~ayerof o.25' to 0.~5• TOP SLAB W/ GRATE
{ 7'> Y3 `a6s~ s.y 8'~'£;d~a?ae f 5n,r. i:<ig_y;; .~;?d sS ••.ai 3 ~ / s€: ~9~atiy.,. ~'$i:s s„~t5: s~g ra •~:'i'q'. f ~k i .As t4~; `.~5,' n l~,.. a 9; 'aa Ms. .£5% ~ Ik1:>~~~7,'trr1.;4;3i A•q:.;i` ~ 35f;"`5Y Y fi? :,iaxi€ 4i .aar ~yVy. i,s.5~ 1' 4° siN., •s1,.:.~p. ; ~ l ~ ~ ' t / - - {{yy ~ stone such as #8, 57, 78 or WEEDS WITHIN THE FIRST TEN FEET OF THE NATURAL AREA. ss .s recommended.
id.:}Y l ~ . ~ ,.n .~i PLANT LIST Underdrain piping F 758, Type PS 28 or Should convey 10 318' perf. ~ ~ QUA KEY NAME ROOT SIZE NOTES AASHTO M-278 times maximum holes 6" VOID SPACE perf. ~ 6' on center, 4
3 ~ / '
~5 ~ , / flow from soil per row; mini 1 ARR ACERRUBRUM'REDSUNSET B&B 2"-21/2'CAL. STRAIGHT TRUNK medium. Minimum gravel re ow; m inim um of 3' of PRECAST REINFORCED BOX 8» ivel
~ ~ I I ~ .w~., ~ 1 1 RED SUNSET MAPLE 8' HT. MIN. of 4" to 6" rigid over pipes; n MATCHED SPECIMENS schedule 40 PVC underneath p ~r pipes; not necessary ELEVATION SECTION
~ , ~ AIL B ~ ~ IT H DET EE D t i ~ 8 BTH BERBERISTHUNBERGII CONT. 24 ~0 HT; or SDR35 or derneath pipes
W ~ l I.. F Y.,., ~ J°I JAPANESE BARBERRY smooth wall 2000 PSF MIN.
i i 8 IGL ILEX GLABRA CONT. 24'-30" HT. ETCHED SPECIMENS p peu M i e m ulmso~f BEARING CAPACITY SEE SEE BMP SECTION FOR SIZING DATA
INKBERRYHOLLY two pipes for BENEATH COLLAR
i • MATCHED SPECIMENS redundancy. S LBE LINDERA BENZOIN CONT. 24 -30 HT.
I I SPICEBUSH TOP SLAB DETAIL TYPICAL ANTI-S NTS .~T~ 'ImSEEP COLLAR
i Q ~ ~ MCE MYRICA CER~ERp CONT 2q•_gp• HT MATCHED SPECIMENS Adapted from 2000 Maryland Stormwater Design Manual \IT&
i Wi1X MYR71E n~~ Rio
1 i
0 1 s , t ^ ~ VOID SPACE
~ (1 SIDE ONLY) MANHOLE COVER ZON ZONE 2 OF NEUSE RIVER RIPARIAN BUFFER
~ . _ ~ ~ i ~r% 437.00 8" DIP T4 MANHOLE ° ; • ° ~ • ° ~ ° ~ ~ ~ ° ; - LEVEL SPREADER (OFFSET OVER
c ~f,~ i / ~ ~ VHOLE COVER 3"x3"x1/ "ANGLE STEEL 'OVER STEPS)
I f ~ o ~ o ~ n s
I f I ~ i .o gyn. Vin. ~ ~e. i~ ~ 4 VOID SP CE
. .N ~ i . ~ ~ ~ FINISHED GRADE BELOW 435.5 / ~ ° . • , (1 SIDE LY)
~ ~ ' ' ~ ~ ~ ' EX. GRADE 6" BERM LEVEL SPREADER (TOP OF LEVEL SPREADER) : ; ; j j ~j ' , ' 48~
1 ` ~ ~ i ..r ~ / D , FLOW TO
r' 0 ~ ~ a 0 . ~ i 1 i~ ~ BYPASS
~~~M ~ / ~ ' ~s d ~ ~ _ _ j ~ ' ~ - VARIES... ~'1 ......u,.~..,..,,.. 435.00 ~ ~ ~ ~ • > ~ 435.70 CHANNEL
1~ 18" MIN. g^ • D
r l I .r-•~-~ SEE PLAN FOR ~ ~ ° ~ i ; ' ~ ~ ~ i i 435. ~ ~ ~ . 434.00 ~ , ~ , ~ . 15 CLASS III R~P ~ MANHOLE STEPS )435.00 ° -
LOCATIONS ~ AND GRADES i -e STEPS
s ~ ' ~ ' ~ / TURF REINFORCEMENT MATTING 8"DIP TO j~%~\o~~ ~ i 434.00 (@14"o.c.) 14" o.c.)
e~ / ~ ,r (NORTH AMERICAN GREEN SC-250 OR EQUAL) LEVEL SPREADER j\~ j\ T
I ~ INVERT 433.00 ~ / %
.r:. J If fl ° - _ ~-.,,.y- i SECTION e - " :'e - ~ ;~o ,~o ~ ;'a e ;~o ;'o :'e • INVERT 433 00 GROUT
/ ~ ~ / , j o% / a BADE
/l / - -=6R~ED~~R~A TO BE REVEGETATED DITCH DETAIL "A" • P 0 D D D D lb Ab • D . D D • D
f ~ WITH GRAS SEED & NI~.U.L6W. ~~i~/~/ illl RCP ~ , ~ . .
.-m..... / / ~l ~ ~ r" ~ . / r / ! ~ R:Y;: s~ F .+.h"'~ . ~P RAP
I / / ~ / ,T I / / I
{ / / "t" .Yai° EX. GRADE
/ / s i / 9. ~ 3'-0" LINE CHANNEL WTH TURF REINFORCEMENT
~f I ,r / ~ ~ MATTING (NORTH AMERICAN
/ ~ / / / •Y ~ ~~~'VARIES ~ LEVEL SPREADER SPLITTER BOX -CROSS SECTION GREEN SC-250 OR EQUAL)
/ Y~ i ' ; ~ ' N~ .t : . a / _ 18" MIN. SEE PLAN FOR NTS LEVEL SPREADER SPLITTER BO NTS :R BOX - LONGITUDINAL SECTION
i~ tr id ft. a 't LOCATIONS
r~ AND GRADES _ TURF REINFORCEMENT MATTING
M I ~ ~ f,r (NORTH AMERICAN GREEN SC-250 OR E(QUAL) 0.00% SLOPE ON TOP OF GUTTER UTILITY INST (FLAT SLOPE) SEE PLAN FOR LEVEL INCLUDING SPREADER LENGTH AND TO BE CONS TOP ELEVATION BY CITY Co 24" CURB & GUTTER (3,000 PSI MIN APPROVED COMPRESSIVE STRENGTH) LEVEL SPREADER SO INSTALL LIP ELEVATION SET 4"-6" WRITTEN AP HIGHER THAN EXISTING SLOPE EASEMENTS _ITY INSTALLATIONS AND OTHER PUBLIC UTILITIES
~ ~ < C r,'r" ,i. , , / r ~ G / ;FADER LUDING SIDEWALKS AND HANDICAP RAMPS ARE
i ~ ~ . ~ SECTION' 3E CONSTRUCTED ON ALL STREETS AS SPECIFIED CITY CODE. THESE FACILITIES HAVE BEEN
.r' ~ ~ / r _ 'ROVED BY THE CITY OF RALEIGH AND SHALL BE
C ~ ~ +'G?i~ p / ~r.~ ,f~~.;} INSTALLED UNLESS A CHANGE IS AUTHORIZED BY 'TTEN APPROVAL. PUBLIC SANITARY SEWER
I Jf .~~~7''tiA V ~sy~y~;~. r !I DITCH DETi~i~IL "B" iEMENTS ARE TO BE RECORDED PRIOR TO FINAL
fIS ~ ~ 0 A" THIS SHEET) ~ ~ NTs DISCHARGE FROM ON DOWNSTREAM SIDE ACCEPTANC SPLITTER BOX STRUCTURE :EPTANCE.
V ~ ~ r ~ y ~ _ EX. GRADE ?NSPORTATION SERVICES
W h .l~' • .i il (8" DIP @ 0.0%) TRANSPORT DIFFUSE FLOW
~ , ~„r i ~ ~ , , f THROUGH BUFFER PUBLIC UTILI ILIC UTILITIES
' 0. I ~ .+i p I ' fl r _~l_ ~ , CONSERVATI JSERVATION ENGINEER
~ , u, +~i EX. GRADE PLANNING ,NNING
vA'Ay R ~N ~ V l ~~~~~jVARIES ~ 18" MIN. SEE PLAN FOR
3'~"
I LOCATIONS AND GRADES 400 CAR ®o°° ~N CAR 0 °°°°oo
U TURF REINFORCEMENT MATTING COMPACTED SUBGRADE a~ OO00ooo000000~~~ oA
U (NORTH AMERICAN GREEN SC-250 OR EQUAL) #57 WASHED STONE - 4" o° o°eo Ok~S S~~~ 0000 Dos
l A THICK (MIN) PERMAMENT
m SECTION GEOTEXTILE UNDERLINER
i C o , o 0 0 00 4 %*'FjvESQ 000 0 o °
0 it ~ ~ N DITCH DETAIL "C" LEVEL SPREADER DETAIL °oo ~0 0000000 00 Q~ pp° o°°° I~yER 5 oo°po
~S NTS °00000000oooopo
i ' 0
co i N O .
~ o. evasion a e es~ ner ca e a ~ ~w w ? n ~ IATrl~ FSheet No.
1 C.O.R. 1ST REVIEW COMMENTS 4/05/07 BGB WOK p?a NU i to
Drawn By Date ~ o o coo MFC/BGB APRIL 2007 DUNHILL, PHASE 1 STORMWATE kVEN L
j ocyo ATER MANAGEMENT DETAILS W IT H Fm R S &Ce HAV ENGINEERS I PLANNERS I SU SURVEYORS
Checked By Job No. r' M O l0 RALEIGH, WAKE COUNTY, NORTH CAROLINA 111 MacKenan Drive Cary, North Carolina 27511 tel: [phone] fax: [phone] www.withersravenel.com
BGB/CSJ 2060260.00 i
i i