20061161 Ver 1_More Info Received_20060925

KE
KELLER ENVIRONMENTAL
ENVIRONMENTAL CONSULTANTS
August 22, 2006
To: NC Division of Water Quality
401 Oversight and Express Permits Unit
Attn: Ian McMillan
2321 Crabtree Boulevard
Suite 250
Raleigh, North Carolina 27604-2260
From: Jay Keller
Keller Environmental
7921 Haymarket Lane
Raleigh, NC 27615
Re: Cobblestone Subdivlsfon additional information
Youngsville, Franklin County, North Carolina
DWQ Project # 06-1161
On behalf of the applicant, Michael Jones, please find attached the requested additional information
dated August 1, 2006.
PROJECT SUMMARY
Project Name COBBLESTONE
Project T e SUBDIVISION
Owner / A licant Michael Jones
Coun Franklin
Nearest Town Youn sville
Waterbod Name UT to Little River
Basin /Sub-basin Neuse 03-04-06
Index Number 27-57- 1
Class WS-II; HQW; NSW
IMPACT SUMMARY
Stream Im act acres 0.02 acres
Neuse River Buffer Im acts acres 0.13 acres
Wetland Im acts acres 0
Total Im act to Waters of the State acres 0.02
Total Stream Im act linear feet 95 linear feet
Please contact me at [phone] (offlce~ (919} 749-8259 (cell) or iay~kellerenvironmental.com if you have
any questions or require any additional information.
Sincerely,
KELLER ENVIRONMENTAL, LLC
JJ~~Z~
Jay Keller
Principal
Attachments:
September 20, 2006 letter (5 copies)
Q~~coe~~
SEP 2 5 2006
DENR -WATER QUALITY
WETLANDS AND STORMWATER f3RANCN

Crowley & Associates, Inc.
Professional Engineers ~ ~D " ~ ~ ~p
1906 South Main Street, Surte 122
Wake Forest, Nord Carolina 27587
919-562-8860
.,~ ~~
EP ~ 5 2pp6
September 20, 2006 S
DEN ANA STE~~BRN~H
Ian McMrllan ~raEN~s
NCDFNR DWQ
1(>5O 1~1ai l Service Center
Raleigh, NC ?7699-165(1
Dc~u~ Mr .ti1cMillan:
In response to your letter dated August 1, 2006 requesting additional information on the
Cobhlestone subdivision project in Franklin County, we offer the following:
l . The project has been revised to have l 6 lots, each with a minimum of 40,000 sf of
area as is required in the WSII watershed area. We have forwarded a copy of the
plan to Franklin County for review and are currently awaiting a response from our
soil consultant regarding the feasibility of each lot for subsurface waste disposal
systems. Initial information indicates that at least one lot will need to be dropped
due to insufficient quantity of suitable soils. We have calculated the impervious
surface arc for the project based on 16 lots. The site area is 17.56 acres, and the
allowahle limit of impervious area is 12%. This allows a total impervious area of
'. l t17? acres (91,79.63 sf), of which 1.14 acres (49,658.40 sf) is accounted for in
ruad~~~ays. "l~he remaining 0.9772 acres (42,131.23 sf) is divided into the 16 lots,
allowing 0.061 1 acres (2,660.42 sf) per lot. Since the development is not yet
constructed, we do not know exactly how the impervious area will be used. Some
lots may elect to have a longer driveway and a smaller house, other may elect the
opposite. Each lot may only have the allotted amount of impervious area, and
these quantities will be indicated on the recorded subdivision plan.
2. Our wetlands consultant, Mr. Jay Keller of Keller Environmental has discussed
this issue with the State Stormwater Permitting Unit. It is our understanding that
Franklin County administers the permitting for this item. The plans have been
approved by Franklin County; however we have submitted to them a revised plan
showing the anticipated 16 lots.
3. Our consultant has indicated that since our nitrogen loading is below 3.6
Ibs/ac/year, we do not need to provide diffuse flow measures into the riparian
buffer. Erosion control measures will be provided during construction and all
roadside ditch water will he conveyed in grassed swales. Grassed Swale

worksheets, signed and notarized maintenance agreements, and nitrogen loading
worksheets can he supplied upon request.
}'base contact me should you have additional questions or comments.
Sincerely,
C owley & Associat ,Inc.
Michael Crowley, PE