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NORTH CAROLINA DEPARTMENT OF ENVIRONMENT
AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
WETLANDS AND STORMWATER BRANCH
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699-1617
FAX: [phone]
PHONE: [phone]
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FAX NUMBER: 9 l c? 374- 31-03
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NORTH CAROLINA DEPARTMENT OF ENVIRONMENT
AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
WETLANDS AND STORMWATER BRANCH
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699-1617
FAX: [phone]
PHONE: [phone]
TELECOPY TO:??` e- L-HIV-i?? YES
FAX NUMBER:- ?I c?
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NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
March 29, 2011
Generation II Carolina, LLC
Attn: Ms. Julie Zalkind
2731 N. Norwood St
Arlington, VA 22207
DWQ #: EXP 11-0180
Wake County
Project Name: Generations H Commercial Center
REQUEST FOR MORE INFORMATION
Dear Ms. Zalkind:
On March 25, 2011, the Express Review Program of the Division of Water Quality (DWQ) received your
application dated March 25, 2011 from Ms. Debbie Edwards, of Soil & Environmental Consultants, PA,
along with supporting information for the proposed commercial development project in Wake County.
The DWQ has determined that your application will require additional information. Please provide the
following information so that we may continue to review your project and prevent return of your
application as required by 15A NCAC 211.0506:
Additional Information Requested
1) Culvert Outlet Dissipater Pad: Please select the design option that gives the minimum stream
impact while meeting the Division of Land Quality's soil and erosion control requirements, and
provide supporting calculations.
2) Wet Detention Ponds: Please revise and submit the following:
a. The storage volume provided for the design water quality volume appears inadequate for each
pond. Please use the Simple Method as outlined in the BMP Manual. Based on the percent
imperviousness, the minimum design storage volumes are 18,676 ft3 and 43,674 ft3 for the West
and East Ponds respectively;
b. State-storage table for each pond beginning from the top of sediment to at least the temporary
pool elevation. The table should be separated into three parts: Forebay, Main Pond and Combined
(or Total);
c. All applicable Sections of the Wet Detention Supplement must be completed, including the
storage volumes and drawdown driving head;
d. Provide buoyancy calculations for the outlet structures;
e. Provide a cross-section showing how the 6-inch PVC pipes will be installed. This must include
any pipe anchoring within the pond, cleanout mechanism, a submerged T-type orifice
configuration (See Fig 10-4 of BMP Manual).
f. Seasonal High Water Table (SHWT) Elevation: This office recommends that a geotechnical
engineer shall evaluate the in-situ soil conditions and evaluate the potential for infiltration losses
and need for a liner. If tests confirm the need for a liner, please ensure that a 12-inch clay liner (or
other synthetic liner) with additional 12-inch layer of compacted soil above it is provided. The
Wetlands, Buffers, Stormwater, Compliance and Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
Location: 512 N. Salisbury St., Raleigh, North Carolina 27604 (91, Floor)
Phone: [phone] FAX: [phone]
Internet: http://portal.ncdenr.org/webtwq/swp/ws/webscape
One
NorthCarolina
A a&rallry
An Equal Opportunity 1 Affirmative Action Employer
Generation II Carolina, LLC
Page 2 of 2
March 29, 2011
permeability tests results shall be supplied to the DWQ if requested. Please provide this note in
bold text on the plans.
3) Level Spreader (LS): West LS should be re-aligned to follow the downstream contour.
4) Planting Plan: None of the nurseries listed in your wet pond planting plan are local nurseries. Local
nurseries are the best option in acquiring plants that will be successful. From BMP Manual: Plant
material should be purchased from a similar provenance or local source to ensure survivability (p. 6-
4). Here is a good source for local native plant providers:
http://www.nceep.net/business/monitoring/veg/nativeplantprovider.htm
Please provide two (2) collated copies of the requested information. Thank you for your attention to this
matter. If you have any questions or wish to discuss these matters further please do not hesitate to call
Joseph Gyamfi at 919-807-6426 or Lia Gilleski 919-807-6446.
Sincerely,
Ian cMillan, Acting Supervisor
Wetlands, Buffers, Stormwater, Compliance and
Permitting Unit (WeBSCaPe)
IJM/jg
cc: File copy
Debbie Edwards, S&EC, PA, 11010 Raven Ridge Rd, Raleigh, NC 27617
Daniel G. Frankel, Generation II Carolina, LLC, 3779 Vest Mill Rd, Winston-Salem, NC
27103