NC0025453_correspondence_19900220

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State of North Carolina
Department of Natural Resources and Community Development
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Governor R. Paul Wilms
William W. Cobey, Jr., Secretary Director
February 20, 1990
Mr. Robert Hyatt
Town Manager
Town of Clayton
P.O.Bos 879
Clayton, North Carolina 27520
Subject: Town of Clayton WWTP
Total Phosphorus Effluent Limit
NPDES Permit No. NCO025453
Dear Mr. Hyatt:
The Technical Support Branch has received your letter dated January 30, 1990
to Dr. George Everett requesting information on the total phosphorus limitation of
the subject facility. Let me take this opportunity to commend the Town for its
foresight in planning for future wastewater treatment needs.
According to the current "Nutrient Sensitive Waters" designation of the Neuse
River Basin, the Town of Clayton is required to meet a 2 mg/1 total phosphorus
quarterly average effluent limitation in their wastewater treatment plant (WWTP) by
January 28, 1993. However, 15 NCAC 2B.0211(b) (3) (A) states that the Division of
Environmental Management (DEM) may further limit the total phosphorus loading of
the discharge if, " in the opinion of the Director, the surface waters experience
or the discharge would result in growths of microscopic or macroscopic vegetation
such that the standards established pursuant to this Rule (i.e. a Chlorophyll a
water quality standard of 40 ug/1) would be violated or the best usage of the
waters would be impaired." When the subject NPDES permit expires on August 1•,
1992, the Town may be required to meet a more stringent total phosphorus limitation
than the 2 mg/1 basinwide target total phosphorus limitation.
The Town of Clayton WWTP discharges into Little Creek, approximately 6.0
miles before its confluence with Swift Creek. At a distance of approximately 2.0
miles below the Clayton outfall, the stream widens into a pond 0.3 miles long and
400 ft wide. In the past, DEM has handled several discharges in situations where a
domestic wastewater outfall is located upstream from water impoundments, similar to
the situation experienced by the Town of Clayton. Our experience indicates that
the discharge of nutrient-laden wastewater (i.e. domestic wastewater) in the
headwaters of a lake or a pond results in excessive algal growth in the receiving
water impoundment. This algal growth is associated with eutrophic conditions which
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
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Mr. Robert Hyatt
Page Two
impair the best usage of the waterbody as defined by 15 NCAC 2B.0101(c) , Freshwater
Classifications. In several of these cases, a total phosphorus limit of 0.5 mg/l
has been applied.
The Division has tentative plans to conduct a field study this summer to
evaluate the impact of Clayton's wastewater discharge on the receiving surface
water quality. The study is necessary to determine the nutrient limitation to be
required in the subject NPDES permit upon renewal. The results of the study should
be available by the end of this year, although this will depend on receiving
laboratory results from the U.S. Environmental Protection Agency in a timely
manner. Although, DEM cannot provide the Town of Clayton with the exact total
phosphorus limitation to be required in the next permit cycle at this time,
I anticipate that it will be below the mandatory basinwide 2 mg/l concentration now
in effect.
If you need further clarification on this matter, please contact Mr. Juan C.
Mangles or myself at (919) 733-5083.
SinTre�
ely,
i'
vor Clements, sst. Chief
atQuality Section
JCM/JTC
cc: Tim Donnelly
Town of Clayton WLA
Central Files

TOWN OF CLA►YTON ----
P.O BOX 879
CLAYTON, NORTri CAROLINA 27520
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January 30, 1990 !IU—
Mr. George Everett
Director
Division of Environmental ManagementQ
P.O. Box 27687 ,
Raleigh, NC 27611-7687
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Re: Clayton Wastewater Treatment Facilities
Total Phosphorus Effluent Limit ' 8 €990
NPDES Permit No. NCO025453
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Dear Mr. Everett:
In accordance with the notification letter dated March 21,
1988, the Town of Clayton is proceeding to comply with the
total phosphorus effluent limit by January 28, 1993 . At
this time we are requesting a determination of the likely
total phosphorus emit to be es a is ed when t '
pe mi i we on August 1, 1992 .
The determination of this total phosphorus limit is impor-
tant as it will greatly impact the engineering study that
the Town currently has underway. Your attention to this
matter would be most appreciated.
Sincerely, -
Robert Hyatt
Town Manager
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cc: Bryan Blake, Ragsdale Consultants
Bill Connor, Ragsdale Consultants
FEB 5 1996
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