20091162 Ver 1_More Info Received_20100105

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ENGINEERS • PLANNERS • SCIENTISTS • CONSTRUCTION MANAGERS
KCI Landmark Center II, Suite 220.4601 Six Forks Road • Raleigh, NC 27609 • Phone [phone] • Fax [phone]
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ASSOCIATES of NC LI, @ R 0W ..--?
JAN 4 5 2Qw
Date: January 5, 2010
DENR • WATER OUALITY
Company: Job Number 12090451 WETLANDS ANDSTORWHATERSRAKH
NC DWQ
401 /Wetlands Unit Project: Wayne Timberlake Springdale
1650 Mail Service Center Water Co. Well Site No. 8
Raleigh, NC 27699-1650 Wake County
Contact: Mr. Ian McMillan Subject: DWQ Project # 09-1162
Wake County, NC
® In accordance with your request
? For your review
® For processing
? Plans reviewed and accepted
? Plans reviewed and accepted as noted
? For revision by you
? For your use/files
? Please call when ready
® Please return to this office
® Approval requested
? Conference requested
at your convenience
Comments: If you have any questions, please contact me by email or at the following phone
numbers office 919-278-2517, by cell [phone] or by email at [e-mail].
Thanks, Steven
Steven F. Stokes, LSS
Environmental Scientist
cc: Files
Lrudim? ?hrou??h Carcllcna
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RESEW
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director
Secretary
December 1, 2009
DWQ Project # 09-1162
Wake County
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
Mr. Wayne Timberlake
6801 Knightdale Boulevard
Knightdale, NC 27545-8831
Subject Property: Wayne Timberlake Springdale Water Co. Well Site No. 8
Ut to Hare Snipe Creek [030402, 27-33-12-(1), B, NSW]
REQUEST FOR MORE INFORMATION
Dear Mr. Timberlake:
On October 29, 2009, the Division of Water Quality (DWQ) received your application dated October 29,
2009, to fill or otherwise impact 141 linear feet of perennial stream and 9,395 square feet of Zone 1
Neuse River basin protected riparian buffers and 5,826 square feet of Zone 2 Neuse River basin protected
riparian buffers to construct the proposed residential development at the site. The DWQ has determined
that your application was incomplete and/or provided inaccurate information as discussed below. The
DWQ will require additional information in order to process your application to impact protected
wetlands and/or streams on the subject property. Therefore, unless we receive five copies of the
additional information requested below, we will place this project on hold as incomplete until we receive
this additional information. If we do not receive the requested information, your project will be formally
returned as incomplete. Please provide the following information so that we may continue to review your
project.
Additional Information Requested:
1. Please provide a full-sized plan sheet showing the entire site with its storm drainage system,
including every inlet, outlet and conveyance device. Please show how diffuse flow requirements
have been met at every proposed outlet location per Chapter 8 of the NC DWQ Stormwater BMP
Manual.
2. Please provide one Level Spreader Supplement Form for each proposed level spreader, available
at: hgp://h2o.enr.state.nc.us/su/bmp forms htm. Please include the Required Items checklist and
all items listed therein.
Please submit this information within 30 calendar days of the date of this letter. If we do not receive this
requested information within 30 calendar days of the date of this letter, your project will be withdrawn and
you will need to reapply with a new application and a new fee.
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
Location: 2321 Crabtree Blvd., Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]
Internet: http://h2o.enr.state.nc.us/ncwetlands/
North Carolina
'Natul iiiik
An Equal Opportunity 1 Affirmative Action Employer
Mr. Wayne Timberlake
Page 2 of 2
December 1, 2009
This letter only addresses the application review and does not authorize any impacts to wetlands, waters or
protected buffers. Please be aware that any impacts requested within your application are not authorized (at
this time) by the DWQ. Please call Ms. Cyndi Karoly or Mr. Ian McMillan at 919-733-1786 if you have
any questions regarding or would like to set up a meeting to discuss this matter.
Sinc ly,
, / a
Cyndi Karoly, Supervisor
01 Oversight/Express Review Permitting Unit
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CBK/Ym
cc; Lauren Witherspoon, DWQ Raleigh Regional Office
USACE Raleigh Regulatory Field Office
File Copy
Steven Stokes, KCI Associates of North Carolina, P.A., Landmark Center H, 4601 Six Forks Road, Suite 220,
Raleigh, NC 27609
Filename: 091162WayneTimberlakeSpringdaleWaterCoWellSiteNo8(Wake)On Hold
III. REQUIRED ITEMS CHECKLIST
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
Ini 'als Sheet No.
_I
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),
- Forebay (if applicable), N/A
-High flow bypass system, tJ
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
I 2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable), N/A
- High flow bypass system,N//Ir
- One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out.
3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable), N/A
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
1
r r ? 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
I n 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
6. The supporting calculations.

7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
"- 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)I
!. PROJECT INFORMATION
Project name Timberlake Subdivision
Contact name Cad Simmons
Phone number 919-833-0830
Date December 9, 2009
Drainage area number DA II LOTS 182
II. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 33,184.00 ft2
Impervious surface area 13,684.00 ft
Percent impervious 41.24 %
Rational C coefficient 0.51
Peak flow from the 1 in/hr storm 0.39 cis
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm 7.04 in/hr
Peak flow from the 10-yr storm 2.74 cfs
Where Does the Level Spreader Discharge ?
To a grassed bioretention cell? (Y or N)
To a mulched bioretention cell? (Y or N)
To a wetland? (Y or N)
To a filter strip or riparian buffer? y (Y or N) Please complete filter strip characterization below.
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cis
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
44.00 ft
ft
50.00 ft
94.00 ft
379.00 fmsl
376.00 fmsl
3.19 % OK
n (Y or N) OK
sq It
41 ft/cfs
(Y or N)
y (Y or N)
(Y or N)
2.74 cfs
(Y or N) A bypass device is not needed.
Form SW401-Leve4 Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material

123,00 ft
n (Y or N)
(Y or N) ??st ?+ie ,i on of esheet
(Y or N) Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
cfs Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
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------------
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Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 2 of 2
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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!
I. PROJECT INFORMATION
Project name Timberlake Subdivision
Contact name Carl Simmons
Phone number
Date
Drainage area number
919-833-0830
December 9, 2009
DA 2 LOTS 384
11. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 26,550.00 ftz
Impervious surface area 16,438.00 ftz
Percent impervious 61.91 %
Rational C coefficient 0.66
Peak flow from the 1 in/hr storm 0.40 cfs
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm 7.04 in/hr
Peak flow from the 10-yr storm 2.83 cfs
Where Does the Level Spreader Discharge?
To a grassed bioretention cell? (Y or N)
To a mulched bioretention cell? (Y or N)
To a wetland? (Y or N)
To a filter strip or riparian buffer? y (Y or N) -
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
32.00 ft
ft
50.00 ft
82.00 ft
382.50 fmsl
380.00 fmsl
3.05 %
n (Y or N) H
sq ft
45 fucfs
(Y or N)
Y (Y or N)
(Y or N)
2.83 cfs
n (Y or N)
Form SW401-Level Spreader, Fifter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 1 of 2
Length of the level lip 130.00
Are level spreaders in series? n
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material

-------------
M
B
ft ?evel si;rer?der length Ok:
(Y or N)
(Y or N) %, not complete this section of the worksheet.
(Y or N) Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
CfS Do not complete this section of the worksheet.
"o not complete this section of the worksheet.
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------------
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Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5 Parts 1. and It. Design Summary, page 2 of 2
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Rear yard area of lots 3
=` = Picture taken on 12114,
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Rear yard area of lots 3
=` = Picture taken on 12114,
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Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
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 maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (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 problem: How I will remediate the problem:
The entire filter strip Trash/ debris is present. Remove the trash/ debris.
system
The flow splitter device The flow sputter device is Unclog the conveyance and dispose
(if applicable) clog ed. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
re air.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will rernediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
(if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
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.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3
Page 2 of 3
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:Wayne Timberlake, Springdale Water Co. Well Lot #8
BMP drainage area number:DA #1 and DA #2
Print name:Wgyne Timberlake
Title:Owner, Developer
Address:6801 Knightdale, Knightdale, NC 27545
Signature: `??/??=/??G?„
Date: % Z
Note: The legally responsible party 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, aL-' L ,?7 a Notary Public for the State of
No ?-46 ea ne 4 a , County of Wa'& , do hereby certify that
Myne Ti:., le,-/ale personally appeared before me this ?l
day of ?eC?m G? ooq , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
OAR Y
7
110%
?i0 n,
0
.1 ell,
SEAL
My commission expires February 15, 2014
Form SA U401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
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~ PINS: 078 626682 , ~ TE; 4,504 SF IMPERVIOUS ~A ~ PER L®T ~z~ ~a ~
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~ Clear the buildin ad areas and road ri t-of way ~ ~ ~ ~ P a g P ~ ~ is ~ • • ~ ~ ORDINARY t.•. v ~ ~ ~ ~ V '0• ~ 9 ~ ~ / i o
~ underbrush and mamtam exam trees ;F In rear arils remove the g v ~ ~ - P HIGH ' WATE R ~ ~ : ~ ~ 1,:~,-, , Y A .C~ i - ~ •1 ~ r. ~ , 1 ~ 'C, ~ N ~ LF 0~ STREAM ~1~~1PACT 141 + ~
\ ~ ;gin e Plant a shade tolerant fescue grass mixture m the rear ~ and ea, pp y o , , p ~ ~ ~ ~ \ , ty ~ ~ N 't4 ~ ~ ~ ~ ~ ~ ~ ~ ~ F DF STCR~ PIPE 133' ~ ~ p'f . ~j~~*•' ' ~ ~ ~ti ~ r
lira Ian f fertilizer and mulch. ~ v y ~ ~ Y ' ; ~ % ~ ' P`' ~ ~ • ~r, app t o v l~ / E j ~ „a, ~ ~iREA OF' ~TREA~i ;IMPACT 912 SR ~a;
e and com late roadwa ~ v ~ ~ ~ ~ E ~ ~ Install water, storm sewer and sanitary sewer infrastructur p y \ ~ - i AREA ZONE 1 N1~8~ 1N>a~ACT \ 9,395 St= ~
KAY ' TARN ' . F ,i" i\. 5 1 construction• LANCE & E~,S E~ ~ ,ti ~ ~ ~ I I I I ~~I~;~ AREA ZONE, 2 NRB~ ~ PACT STORM 3 813 SF ~ ~
PIN: 0788621610 CE ERLINE OF 1A.~:~~"~~~~Lg P V ~ Seed and mulch all disturbed areas and establish ood ound cover v~ v 2~,:, ` " • ~ = R v ~ ~v ~ Lsr .,,y~,- \v A~~~~A ZONE`~~2 NRB I ACT SAN.SEWER X2,013 SF G~I ,~r~~~~
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Install silt fence up slope from the level spreaders ZONED - R-2 ~ v v ~ ~ ~ E . \ PC ~ , ~ a fl I STA ~ ''a
~ After the ass is established in the rear yard areas, install the plunge pool and ~ ~ v v . ~ s'tiz. ~ ~ ~ ~ _ ' _ ~
level spreaders as spawn on the plan. \ , ~ t., 9,0 1 ; - ~ - 26 B 26' G ~ \ ~ ~ \ ~ ~ ~ ~ I r `til sT~ ;
~ ~ ~ ~ • 1Vlaintam the up slope silt fence until the home construction is complete. Remove \ ~ , , , • P ~ \ \ 9i 30,64 SF ~ ~ W I w ~ r.
1 the lawn area is well ~~j~ \ 2 x, ~ 40 R the silt fence after all house construction is comp ate and _ . V \ j ( ~ V 9~ ~
~ \ `~0....., ; F ~ ':GYP • established" ~ ~ ~ ~ " ~.iN~ , , ~ ~ \ ( ~ , ~ ~ ti~ I ~
Inspect and maintain level spreaders as outlined m the OEM agreement. _ • • S
m ~ ~ J7 . . . . . . . . ' . ~ ~ , \ _ l d- ~
r> ` %j , 1. . \ ,`~~.'.'~r.'.'.'.','...'.'.'.•.'.'~`~ " '11NV=379. j-.,-': t
\ \ ~ ~ LANDSCAPE` A~-~~SS \ ~ V ~ ~ ~ ~ ~ p
~ ~~EASEMENT OF~',ADDITION~~ ~ ~ A ~ . oa' ~ , ~
~ ~V ~ D o D D \ \ ~ ~ ~ ~ ~ ~ ~
R ~ ~ ~ ~ 3 RIP RAP APRON \ \ . t .20.•.. o ~ i
~ y w ~ z ; \ y WITH FILTER FABRIC O OD D OD OD OD OD ~ \ \ ~ ,,I ~ \
UNDERLINER D D o \ , .I x~
>.r ~ \ \ ~k , •SPRdADEf~' o ~ 1,4'„ 0 0 0 0 0 0 0 0 0 ` \ ,,,v , ~ ~ ~ ~i ~ ~
o D `D o o D D D D o o .~10=~:~~CfB' -C ~ ~E,, ~ 'EIVC.Ti~=12~.' Y v \ lO ~
~ I ~ i ~ ' ~ . • ~ z N EX. PHONE `
~ D D D ~O D ~o D D D D o \ \ ~ ~ . ~i A i~21,4~ 2 SF ~ - ~ 1~t N U ~
O O O . Q ~ ~ ' ~ a A 0 s
D o 0 o D o o V Gj ~ ~ ~ \ ~fl ~ a ~ ~ ~ Q ~ . . I ~ ...-%t~"~ ~ \ a f~{
a' a A ~ ~ ~ ~ D a;i TAPER \ F ~ ~ ~ C3t ~ ~d I
~ O O O O O ~ a ,y v V ~ \ (C~ _ ~ D D D o ~ a ~ ~ A 4~ \ ~ ~ i 1'imb®rlakeS~aronwa~rAn~lvsis i~ ~
~ ~ t _ ~ ; ~ ® t~
• ~ a . ~ ~ ~ ~ Lots 1 & 2 , ~
w Q , ~ a VICKIE F. ANDREWS 1 \ \ r INSTALL SILT -LEVEL a c a' c d • • '0 . . a a . a a a ~ ~ PINS: 0788621347 \ \ V ~ - ~ _ MAINTAIN ~I h, ..LEVEL t \ ~ N.
~ SPR DER-- I+I PLNCE° ~ ~ b ~ ~ ~ SINGLE FAMILY \ V • . ~ ~ ~~~>-~s° SILT- E U°~L USE E MAINTAIN _ f , ~ ~ + Dranage Area 1.50 ac w SES E I
z ~ a4 ' : d CONCRETE ZONED - R-2 \ ~ ~.,F ~ ;,,ter , _ ~ ~ da a . a as a ~ 8 ? Existing Condition Undaveloped ~ ~
r', A _ 1 M ~P a, ter ~ ~ ~ Q-Post Q discharge with ~ ~ i t~
w a ~ ~ ~ ' Q SCALE: 1'o®~r - - , . v ~ ~ , ~ Storm Frequency Q-Pre condition condition Storage ~ ; ~
. \ ` ~ ~
a a,, ~ - - 5AZ ,kZ ~ ,n;,:- ` ~ 2 Year storm 2.44 cfs 3.83 cis 2.15 cis ~ r ~ 10 Year Storm 3.11 efs 4.87 cfs 2.82 cfs
6"THICK x 2' WIDE /ivy ~ \ ` ~ _ aM. ~ R I~~i~ , - _ _ - - ~ 1 I ~ ~ C ~ ~ N 3
3 RIP RAP A \ 60 e CONCRETE SL B ~ ~ ~ ~ ~ Leval Spreader Length 13'Icfx 2,68 cfs = 34.8' Use35' Length ; ~ ~
APRON /yvv/v ~ - ' W~ #4 REBAR ~ ` ~ 1~ ~ 1, 1
D o ~ ° PA 12" ON //v//v//v//v//A/ S C ED / / / / / / , _ ~ Lots 3& 4 I! w",,
EX .G„a4.~ N BOX _ CENTER \/j\/j //\/j\/j\//\/j\/j\~ ° ° ° p ~ 1 ~i ' ~ ~
D o 0 0 V// //V//V//V//V//?jV//V//V//V//Vi ° ~ , e a VA/AA/AVA/AA/AA/AA/AA/AA/AA/AA/AA/AA/AA~ ° ° ~ ~ ~ ~ ~ ' Drainage Area 21 r ~ Existing Condition undeveloped ` ~ ~
/ ~ a ~ vv//yiyivv/iv~ivv/ivv/ivyivv/ivv/iw~~ ~ ~ I ROGER 8c GR ROGER 8c GRETCHEN ADEMA o ~ 1
r D D D D D D D p • . :a : \\\/\\/\\/\\\\\\\\\\\\\\\/\\i~`~ \ PIN 07886 'IN#: 0788627234 4-Post Q discharge with ~ ~ ~ ~
\ \ \/\/\/\/\/\\i\~~/~\~ SINGLE FAMLI SINGLE FAMLY Storm Frequency Q-Pre condition condition Stora e l ~'I v
%~/~~//i~//~J !/~~/~~/,~~/~~/~i~/' f~ r'1 ~I I I ~ I ~ 1 n t~~ r^ ~1 f n f'~T ~ ~ ~ ~ ~nni~n _ R_ ~nni~n _ R_~ „ _ ~ ~ _ fx1 r,~
CONCRETE, EXTEND--/ 4 REBAR EXTEND 6" CCU I UJ I-lVV T . 0 L rear Storm S 40 CIS 4.tS4 CTS 1,b0 CIS
REBAR 6,. INTO VERTICAL, 18 HORIZ. m rv r N 10 Year Storm 4.40 ct 6.16 A 4.32 cfs I 4
CONCRETE KNIGHTDALE, NC 27545
INSTALL FILTER SCALE € Level Spreader length 137cfs x 4.32 A =56.16' Use 57' Length ~i tt ~,r~ r~ CAW
FABRIC UNDER N!
RIP RAP LEVELSPREADER
.~..,.r.m-.w.--.- T . Y'om'. -.l...-•---~T'.- .r..-.~ ..^'(r I ,;'S _ yn_'".T`~j _ _ . ;lIngliggsli 77- wa-