20040544 Ver 2_Maps_20090317

WITHERS RAVENEL
J
ENGINEERS I PLANNERS I SURVEYORS
111 MacKenan Drive
Cary, North Carolina 27511
Tel.:[phone] Fax: [phone]
TO: NCDENR Division of Water Quality
2321 Crabtree Blvd., Suite 250
Raleigh, NC 27604
WE ARE SENDING YOU ® Attached
? Shop Drawings ® Prints
® Copy of Letter ? Change order

DATE 17 March 2009 Job No. 02080688.01
ATTENTION Ian McMillan
RE:
River Run Subdiv. Ph. 4 & 5
- IMPACT MAPS
? Under separate cover via the following
? Plans ? Samples Specifications
® Diskette ?
COPIES DATE NO. DESCRIPTION
2 sets 03.17.09 02080688.01 River Run Ph4&5 - Impact maps
1 03.17.09 02080688.01 Cover letter (sent to NCDENR)
2 copies 03.17.09 02080688.01 Stormwater Management Report
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OENR - WATER LYLipTEI BRPtICtt
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THESE ARE TRANSMITTED as checked below:
® For approval ? Approved as submitted ? Resubmit
® For your use ? Approved as noted ? Submit
? As requested ? Returned for corrections ? Return
? For review and comment ?
? FOR BIDS DUE 20 ? PRINTS RETURNED AFTER LOAN TO US
REMARKS: Please accept the impact maps and the stormwater management report that we have
submitted for approval. Please call if you have any questions. Thanks.
copies for approval
copies for distribution
corrected prints
COPY TO: File SIGNED: Adam Ashbaugh, PE, AICP
If enclosures are not as noted, kindly notify us at once.
WITHERS L?March 17, 2009

Mr. Ian McMillan
North Carolina Department of Environment & Natural Resources
Division of Water Quality
2321 Crabtree Blvd., Suite 250
Raleigh, NC 27604-2260
RE: River Run Phases 4 and 5
DWQ Project No. 04-0544
W&R No. 02080688.01
Dear Mr. McMillan:

The attached plans are being submitted for the purpose of modifying the previously issued
401 Water Quality Certification for the above referenced project. Please find the following
plans and calculations included with this submittal:
- 2 copies Modified Impact Maps
- 2 copies Stormwater Management Report
As discussed in our meeting last week, the proposed modifications to the previously issued
permit are necessary for development of Phases 4 and 5 of the subject property. Impacts
have been avoided and minimized to the greatest extent practical.
The previously issued permit allowed for a total impact to 181 linear feet of perennial
streams and 11,685 square feet of protected riparian buffers. As indicated on the attached
modified impact maps, this proposed modification will increase the total impacts to 230 LF
of stream impact (increase of 49 linear feet) and 21,133 SF of buffer impact (increase of
9,448 square feet). These impacts are necessary for the construction of a cul-de-sac
roadway extension required to access the upland portions of the property, together with
pedestrian trails proposed for interconnection of the 2 phases which are separated by a
jurisdictional stream. Potential impacts to this stream crossing have been avoided by
elimination of a road crossing indicated on previous Preliminary Subdivision Plans, and
minimized by use of the pedestrian trails in place of the roadway.
Additional temporary buffer impacts are indicated on the modified impact maps for the
purposes of gravity sewer construction and connection to the existing system, together with
the outfall swales necessary to convey storm water discharge from the proposed
underground sand filter BMP's through the buffer for direct discharge to the stream, thereby
preventing erosive velocities within the buffer. Please note that the sewer alignment has
been modified from the originally issued permit, such that proposed temporary impacts T
and U replace previously permitted but not constructed impacts O & P.
RAE/ E N E L
ENGINEERS I PLANNERS I SURVEYORS
iii MacKenan Drive i Cary, NC 27511 1 tel: [phone] fax: [phone]oo8 i www.withersravenel.com
7040 Wrightsville Avenue i Suite 1o1 1 Wilmington, NC 28403 1 tel: [phone] fax: [phone]
Brunswick Surveying 1 1027 Sabbath Home Rd, SW i Supply, NC 28462 1 tel: 91o.842.9392 i fax: 91o.842.8o19
Treatment and attenuation of stormwater runoff is addressed in the attached Stormwater
Management Report. The report includes the necessary calculations required to show
compliance with the Neuse River Basin rules for Nitrogen export from the site and City of
Raleigh Stormwater Management Ordinance.
If you have any questions regarding this submittal, or require additional information, please
do not hesitate to call.
Sincerely,
WITHERS & RAVENEL, INC.
dam Ashbaugh, ICP
Attachments
cc: Justin Patsey, John Wieland Homes
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