20061214 Ver 2_More Info Letter_20070502

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
May 2, 2007
DWQ Project # 06-1214, Ver. 2
Wake County
Mr. Tim Smith
100 Weston Estates Way
Cary, North Carolina 27513
Subject Property: Recreation Tract of Woodcreek (formerly Wild Acres)
UT to Middle Creek [030403, 27-43-15-(1), C, NSW]
REQUEST FOR MORE INFORMATION: STORMWATER MANAGEMENT PLAN
Dear Mr. Smith:
On January 31, 2007, the Division of Water Quality (DWQ) issued a 401 Water Quality Certification and
Neuse River Basin Buffer Authorization to impact the following as described in your modified
application dated January 11, 2007 for the purpose of constructing the Woodcreek Residential
Subdivision:
• 0.49 acres of wetland (0.37 acres permanent impact, 0.12 acres temporary impact),
• 345 linear feet of perennial stream (255 linear feet permanent impact, 901inear feet temporary
impact),
• 231 linear feet of intermittent stream (2091inear feet permanent impacts, 221inear feet temporary
impact),
• 43,348 square feet (ft2) of protected Zone 1 Neuse River basin riparian buffer, and
• 27,817 square feet (ft2) of protected Zone 2 Neuse River basin riparian buffer
In order to meet Condition 7 of the 401 Certification for this project, a stormwater management plan
pertinent to the Recreation Tract of Woodcreek Subdivision was received by the DWQ on March 1, 2007.
The DWQ has determined that your stormwater management plan was incomplete as discussed below.
The acreage of the impervious surfaces and open space reported on the enhanced aerial
photograph do not match the acreages reported in the Extended Detention Worksheet. Please
explain the discrepancy.
2. Please provide an overall site plan that shows lot layouts and the footprints of the impervious
surfaces. The site plan must show that all of the stormwater from the site will be routed to the
extended detention wetland.
3. The roadside drainage from the proposed new street may not be directed to a level spreader
without first being treated by an allowable BMP for Nutrient Sensitive Waters (NSW) as
described in General Certification 3631.
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] /FAX [phone] Internet: ht n -h?o_enrstate.nc.usf`ncwetlands
Nose Carolina
~tura!!y
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Tim Smith
Page 2 of 2
May 2, 2007
4. Please revise the drainage system to the extended detention wetland so that all of the stormwater
is routed to the forebay at the north end of the constructed wetland. The forebay that is currently
proposed in the center of the wetland will reduce the treatment capability of the wetland and
likely result in short,circuiting.
5. Please provide all of the information under listed in the "Required Item Checklist" in the DWQ
Extended Detention Worksheet. Some of the omitted items include a planting plan, a delineation
of the drainage area, and plan details for the inlet and outlet structures.
6. The outflow from the extended detention wetland may not be directed to a scour hole in the
currently proposed location. A scour hole is only allowable in areas where the downslope is less
than or equal to two percent. (See the Level Spreader BMP Manual Chapter at:
http'~/h2o enr state nc us/ncwetlands/documents/LevelspreaderBMPManualchaUter.doc.)
Please replace the scour hole with a properly designed level spreader. In your resubmlttal, please
include level spreader plans, calculations and a DWQ level spreader worksheet so that DWQ staff
can evaluate the design of the level spreader.
The DWQ will require the above additional information to finalize review of the stormwater management
plan for the Recreational Tract of Woodcreek Residential Subdivision. Please provide the following
information so that we may continue to review your project. You are welcome to contact me at 919-715-
3425 if you have questions or would like to set up a meeting. ,
Sincerely,
~~~ caS
Annette Lucas, Environmental Engineer III
AML/aml
cc: Nicole Thomson, S & EC, P.A., 11010 Raven Ridge Road, Raleigh, NC 29614
USACE Raleigh Regulatory Field Office
Mike Horan, DWQ Raleigh Regional Office
DLR Raleigh Regional Office
File Copy
Central Files
Filename: 061214v2 WoodcreekRecTract(Wake)_Hold_S W