20071856 Ver 1_More Info Letter_20071121

~QF W ATF9Q Michael :.Easley, Governor
~~ ~i William G. Ross Jr., Secretary
~ rte" North Carolina Department of Environment and Natural Resources
~ `C Coleen H. Sullins, Director
Division of Water Quality
November 21, 2007
DWQ EXP No. 07-1856
Franklin County
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
CADE Construction, Inc.
Attn: Bill Bland
120 F Weathers Street
Yourigsville, NC 27596
Subject Property: Arch Aluminum
REQUEST FOR MORE INFORMATION (STORMWATER MANAGEMENT PLAN) -
EXPRESS REVIEW
Dear Mr. Bland:
On November 20, 2007, the Division of Water Quality (the "Division") received some of the additional
information requested to accompany your stormwater management plan for the above-referenced project.
The DWQ has determined that this information is still incomplete.
Please provide the additional information requested below in order to continue review of your project
and to prevent denial of your application as required by 15A NCAC 2H .0506:
Additional Information Requested
Wet Detention Pond
a. Please be advised that the DWQ cannot accept this as a wet pond/wetland system. The
proposed BMP is completely a wet pond, and stand-alone wet detention pond does not meet
the 30% TN and 30% TP treatment levels required for a site draining to NSW watershed.
Therefore, the wet detention pond must either be combined with another BMP, or replaced
with an appropriate BMP (such as a constructed wetland or bioretention area) in order to meet
the nutrient removal requirement. Please refer to the following site for more information
http:/lh2o.enr. state.nc.us/ncwetlands/documents/SMPRequirementsforApplicantsotherthanN
CDOT.pdf
2. Diffuse Flow ,
a. The exit velocities of 3.00 ft/s and 8.86 ft/s, corresponding to flow rates of 5.32 ft /s and
15.66 ft3/s respectively, are considered erosive. Please take this into consideration, and
redesign outlet structures such that non-erosive velocities (<2.0 ft/s) can be attained from the
new BMP.
Please respond within five (5) days of the date of this letter by sending two (2) copies of the above
information in writing. The Express Review Program is a process that requires all parties to participate in a
timely manner.
401 Oversight I 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]Intemet: http://h2o.enr.state.nc.us/ncwetlands
Nye Carolina
tura!!y
An Equal OpportunitylAffirmative Action Employer-50% Recycledl10% Post Consumer Paper

Arch Aluminum Stormwater Management Plan
Page 2 of 2
November 21, 2007
This letter only addresses the application review and does not authorize any impacts to wetlands, waters
or protected buffers. Please be aware that any impacts requested within your application are not
authorized (at this time) by the DWQ.
Please contact Joseph Gyamfi or Lia Myott at 919-733-1786 if you have any questions regarding or
would like to set up a meeting to discuss this matter.
Sincerely,
~~
Cyndi Karoly, Supervisor
401 Oversight/Express Review Permitting Unit
CBK/j g
cc: James Shern, USACE Raleigh Regulatory Field Office
Lauren Witherspoon, DWQ Raleigh Regional Office
File Copy
Central Files
Jay Keller, Keller Environmental, 7921 Haymarket Lane, Raleigh, NC 27615