20061617 Ver 1_More Info Received_20070816

WITHERS RAVENEL
ENGINEERS I PLANNERS 1 SURVEYORS
iii MacKenan Drive
GARY, NORTH CAROLINA, 275ii
X919) 469-3340
FAX [phone]
To: North Carolina Division of Water Quality
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27607
WE ARE SENDING YOU
^ Shop Drawings
^ Copy of Letter

UAL 081 ~O7 lOBNO. 020 0261.0
ArrfNT10N C n d i Ka ro
PHONE# 7 _1786
RE: Wendell Falls Subdivision
Marck Creek {0 0 02, 27- 8, C, NSW}

©Co _ I ~.o 17

® Attached ^ Under separate cover via the following items:
® Prints ^ Plans ^ Samples ^ Specifications
^ Change order ^ Diskette ^
COPIES DATE NO. DESCRIPTION
Revised Sheets .1, .2, and
S Level Spreader 217 Worksheet
THESE ARE TRANSMITTED as checked below:
® For approval ^ Approved as submitted
^ Foryour use ^ Approved as noted
^ As requested ^ Returned for corrections
^ For review and comment ^
^ FOR BIDS DUE 20 ^ PRINTS RETURNED AFTER LOAN TO US
REMARKS:
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COPY TO: File
^ Resubmit
^ Submit
^ Return
copies for approval
copies for distribution
corrected prints
SIGNED: Ken Jesneck, PE
lfenc%sures are not as noted, kindly notify us at once.

WITHERS ~~' RAVENEL
ENGINEERS I PLANNERS I SURVEYORS
August 15, 2007
Ms. Cyndi Karoly
North Carolina Division of Water Quality
401 Oversight/Express Review Permitting Unit
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27604
Re: Additional Information Request
Wendell Falls
Marks Creek {030402. 27-38, C, NSW}
W&R Project 02050261.04
Dear Ms. Karoly:
Attached you will find five (5) copies of the information requested in your letter dated August 8, 2007.
Specifically, the storm drainage system has been revised to present the amended design information. An
updated worksheet for Level spreader 217 is included. Please note that the area where level spreader 217 will
be located is wooded, and the level spreader has been sized accordingly. Also, please note that the level
spreader will be used until the property to the south of SF 2 is developed. The storm water from the
intersection will be rerouted through the proposed development with appropriate treatment provided, i.e. a
level spreader or constructed wetlands, depending on the resulting impervious surface.
The proposed, level spreader is providing the treatment for storm system at the intersection of two future
roads. At this point, we are proposing only to grade the two streets. The reason for construction of the storm
drainage system is to avoid construction conflicts with water and sanitary sewer systems and to facilitate the
installation of storm drainage. Construction of the storm drainage system after the water system has been
installed will be problematic and disruptive to the existing systems in the storm drainage system is deferred to
a future date.
Comment #2 can be addressed by reviewing the overall impact map submitted with our individual permit
application. The crossings on Big Falls Drive are included in the impacts designated as R2 and R.4 The road
to the south in the future development will eventually loop back to Big Falls Drive, thus no further impacts are
warranted for this street.
I hope we have providing sufficient responses for additional information request. If you have any questions,
please feel free to contact met at [phone] or email at [e-mail].
Sincerely,
WJ~'HERS c~:/F~/~4VJENEL, INC.
~~~..
Project Manager ~ 1
CC: Mike )ones -Wendell Falls Residential, LLC
QEtVr~ .. VVAI'~h ;,
iii MacKenan Drive i Cary, North Carolina 27511 i tel: [phone] i fax: [phone] i www.withersravenel.com
7040 Wrightsville Avenue, Suite 101 i Wilmington, North Carolina 28403 i tel : 9io.z56.9z77 i fax :[phone]
1027 Sabbath Home Road SW i Supply, NC 28462 i tel: [phone] i fax: [phone]

DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name : Wendell Falls Subdivision
Contact Person: Ken Jesneck. PE Phone Number: (a19 ) 469-3340
Level Spreader ID: FES 217
Level Spreader Length 65 ft. (perpendicular to flow)
Drainage Area 1.12 ac. (on-site and off-site drainage to the level spreader)
Impervious Area 0 ac. (on-site and off-site drainage to the level spreader)
Forebay Area o cu ft. (0.2% of the contributing impervious surface area)
Maximum Filter Strip/Buffer Slope 5 % (6% for forested/leaf littler cover, 8% for grass/thick cover)
Max. Discharge from 1"/Hr Storm o.99 cfs
Max. Discharge to Level Spreader 0.99 cfs
Filter Strip/ Zone 1 Buffer Vegetation Forested
Filter Strip/ Zone 1 Buffer Width 30 ft.
Filter Strip/ Zone 2 Buffer Vegetation Forested
Filter Strip/ Zone 2 Buffer Width 20 ft.
(Discharge rate from extended detention wetland or pond)
(GrasslThick ground cover or Forested)
Bypass Method Used Pipe 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.
Aoolicants Initials
KLJ Project Site was visited prior to designing level spreader system.
nsoios Date of the Site visit. Please attach time-dated digital photos of existing buffer conditions.
KLJ Level spreader length is at least: 13 ft. per cfs for thick ground cover /grass; OR 65 ft per cfs for 50-
footcanopied 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~lter strip).
KLJ All ground cover types and their widths have been labeled on the construction plans.
KLJ All contours have been depicted on the construction plans.
KLJ No structures are located in protected buffers (must meet no practical alternatives criteria).
KLJ No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
KLJ Construction details for the level spreader have been provided.
KLJ The operation and maintenance agreement signed and notarized by the responsible party is provided.
N/A No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
KLJ Bypass conveyance method is specified and construction details and calculations are provided.
N/A Alternative design option is specified and plan details and calculations are provided.
KLJ Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
KLJ Construction details for the bypass and outlets are provided.