NC0044725_Copper Limitations_20081031

��C WATF,Q Michael F. Easley,Govemor
0� QG State of North Carolina
William G. Ross, Jr., Secretary
rr- Department of Environment and Natural Resources
October 31, 2008
Mr. Paul G. Davis
Laurinburg-Maxton Airport Commission
16701 Airport Road
Maxton, North Carolina 28364
Coleen H. Sullins, Director
Division of Water Quality
DENR-FRO
NOV 0 4 2008
DWQ
Subject: Limitations for Copper
Copper Action Level Policy
Laurinburg-Maxton Airport (LMAC) WWTP
NC0044725
Scotland County
Dear Mr. Davis,
In accordance with the Division's Copper and Zinc Action Level Policy, DWQ has
determined that this facility shall receive a copper limit of 268 µg/L. Your facility has been notified
that it has reasonable potential to violate the instream action level for copper and has been asked to
rule out copper as a causative effluent toxicant. As of October 2008, the Division has not received an
investigative report from your facility that rules out copper as the causative toxicant. Therefore
based on your facility's repeated whole effluent toxicity failures, the fact that your effluent data
shows reasonable potential to cause an exceedance of applicable water quality standards, and your
inability to rule out copper as a causative toxicant, a copper limit shall be placed in your permit.
Rather than reopen your permit at this time, the Division will include the copper limit upon
renewal of your permit, which expires on July 31, 2009.
If you have any questions or comments concerning this issue, please contact Toya Fields at
[e-mail] or [phone].
Sincerely,
Lc , Coleen H. Sullins
Cc: Belinda•Henson, Fayetteville Regional Office, Surface Water 'Protection
Dale Lopez, Fayetteville Regional Office, Surface Water Protection
PERCS Unit
Aquatic Toxicology Unit
Central Files
NPDES File
1617 Mail Service Center, Raleigh, North Carolina 27699-161T,,s Telephone [phone] FAX [phone]
512 N. Salisbury Street, Raleigh, North Carolina 27604 On the Internet at http://www.ncwaterquality.org
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Naturally .