NC0023299_Correspondence_19911015

State of North Carolina
Department of Environment, Health and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North' Carolina 27611
James G. Martin, Governor
William W. Cobey, Jr., Secretary
Mr. H. G. Webb, Vice President
Oakwood Land Development Corp.
2225 South Holden Road
P. O. Box 77013
Greensboro, NC 27417-7013
Geo er t�t h`?D
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October 15, 1991 OCT 2 3 1991
BRANCH
Subject: NPDES Permit No. NC0023299
Woodlake Mobile Home Park
Guilford County
Dear Mr. Webb:
In response to your inquiries of May 18, 1990 and August 18, 1990 concerning the
discharge limit requirements in your draft NPDES penult, the Division of Environmental
Management offers the following: The NH3 - N is limited as a toxicant and not as a nutrient.
According to procedures, the division has changed the NH3 limit from a daily maximum to a
monthly average.
You stated in your letter that your instream monitoring data show little or no reduction of DO
as a result of the discharge. However, due to limited access, the downstream monitoring location
is not in the optimum location. Also, the facility is currently operating at only half of the permitted
wasteflow. While the instream data indicate there is currently a minimal impact, the limits are
based on design conditions and stream flow of 7Q10 in order to protect water quality under the
most extreme conditions.
The zero -flow values for the 7Q10 and 30Q2 are not arbitrary. These values were arrived at
by USGS according to established procedure. The Division would be glad to consider any
information that suggests a positive 7Q10. Attached please find the procedure for performing a
flow study in order to refute a zero flow determination.
The division has determined that your application has been processed in accordance with
current DEM regulations. Therefore, the Division will proceed to issuance of the subject peiutit.
The permit specifies the appeal procedures for the applicant.
Pollution Prevention Pays
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

Eilko
If you have further questions or comments please do not hesitate to contact Mr. Dale
Overcash at [phone].
Sincerely,
Steve W. Tedder, Chief
Water Quality Section
cc: Central Files
Winston-Salem Regional Office