NC0023892_Speculative Limits_19920331

State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27604
James G. Martin, Governor George T. Everett, Ph.D.
William W. Cobey, Jr., Secretary Director
March 31, 1992
Michael S. Aquesta, P.E.
Peirson & Whitman, Architects and Engineers, P.A.
5510 Munford Road
Raleigh, NC 27612
Subject: Salisbury Speculative
NPDES Nos. NCO023884 (Grants Creek) and NCO023892 (Town Creek)
Rowan County
Dear Mr. Acquesta :
The Division of Environmental Management (DEM) has reviewed your request for
speculative NPDES Permit limits for the City of Salisbury. Since the proposed expansion(s) are
greater than 0.5 MGD, an Environmental Assessment will be necessary. Please contact Boyd
DeVane of the Water Quality Planning Branch at [phone] for more information.
The Division is initiating a basinwide water quality management strategy for the state's
surface waters. All NPDES permits within a given basin will be renewed in the same year,
allowing the Division to examine interaction among all point and non -point sources of pollutants
for that basin. The basin plan for the Yadkin Basin will be promulgated by 1998 and a draft
version will be available for public comment sometime in 1997. In the meantime, discharge
limits will be based on existing procedures. In addition, my staff is currently developing a
nutrient response model of High Rock Lake. The outcome of this model will affect future permits
for discharges to High Rock Lake.
The assimilative capacity at the current discharge sites of the City of Salisbury, Grants
Creek and Town Creek, is limited. Each stream provides less than 2:1 dilution for wastewater.
As a result, both streams have been stressed by receiving municipal wastewater discharges. Town
Creek was ranked the most nutrient enriched tributary of High Rock Lake in a field survey
conducted by DEM in 1989 and 1990. Total nitrogen and total phosphorus exceeded target levels
set by DEM for the control of algal growth. Chlorophyll -a levels regularly violate the state
standard for lakes. Algal blooms have caused high dissolved oxygen (DO) levels at the water
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surface while leaving the bottom waters anoxic. Grants Creek is similarly impacted, ranked
second by DEM in nutrient impairment. In addition, Salisbury's self -monitoring data indicate
violations of the state's DO standard at the mouth of Grants Creek.
If the City chooses to expand its discharges at either of the existing locations, nutrient
limitations are likely. A plant with a high degree of flexibility to include nutrient removal should
be considered. At all expanded wasteflows, advanced treatment to meet summer limits of BOD5
= 5 mg/l, NH3-N = 1 mg/l, and DO = 6 mg/1 will be required. The fecal coliform limits will be
200 colonies/100 ml. In addition, dechlorination or alternate disinfection will be required.
Relocation of the discharge(s) to the Yadkin River is not recommended at this time due to
a number of outstanding issues regarding wastewater discharges into lakes used for recreation and
water supply. Public reaction may be a consideration in the relocation of a discharge to High
Rock Lake since the lake is used for recreation. Also, the Division of Environmental Health will
review any permit application for a lake discharge in light of the water supply use of High Rock
Lake. These potential use impairment issues would need to be addressed before DEM could
develop appropriate wasteload allocations for the lake discharge alternatives.
The above limits are speculative and are for use in an engineering review of discharge
alternatives. Final limits will be provided upon receipt of an application for permit expansion. If
you have any questions concerning the above issues, please call Betsy Johnson at [phone].
dSinc ly,
J. evor Clements, Asst. Chief
a er Quality Section
JTC/eaj
cc: Boyd DeVane
Betsy Johnson
Mooresville Regional Office
Central Files (2 copies)

m75
PEIRSON
WHITMAN
ARCHITECTS
AND
ENGINEERS,
PA.
ESTABLISHED 1938
5510
MUNFORD ROAD
P. O. BOX
52099
PHONE
919/782-8300
FAX
919/783-7642
TWX
5109280511
RALEIGH
N.C.
27612
February 11, 1992
Mr. J. Trevor Clements
Water Quality Section
N. C. Division of Environmental Managettent
Post Office Box 29535
Raleigh, North Carolina 27626-0535
Re: Speculative Permit Limits
Town Creek and Grant Creek WWM's
Salisbury, North Carolina
P&W Project No. 1100
Dear Mr. Clements:
1 '15 1992
BRANCH
oun r
Pen -son & Whitman has been directed by the City of Salisbury to update
its 201 Facilities Plan. As part of this process, we will be
investigating several alternatives for the location of wastewater
discharge points. Pursuant to this, I would like to request
speculative NPDES Permit limits at the following locations, at the
designated flo'ws:
1 Existing Discharge Point
Town Creek WWIP
Flow = 7.5 MGD
2. Existing Discharge Point
Tbwn Creek WW1P
Flow = 10 MGD
3. I-mmediately downstream of the confluence of Town Creek
and the Yadkin River
Flcx%T --;'7.5 MGD
4. Immediately downstream of the confluence of Town Creek
and the Yadkin River
Flow = 10 MGD
5. Existing Discharge Point
Grant Creek WWTP
Flow = 10 MGD
6. Existing Discharge Point
Grant- Creek 11'e,71P
Flow = 15 MGD
7. Immediately downstream of the confluence of Grant
Creek and the Yadkin River
Flaw = 7.5 MGD
8. ImTtediately downstream of the confluence of Grant
Creek and the Yadkin River
Flow = 10 MGD
9. Dmiediately downstream of the confluent of Grant Creek
and the Yadkin River.
Flow = 15 MGD
U.S.A.

Mr. J. Trevor Clements
February 11, 1992
Page two
If you need any additional information to help in your analyses, please
call me.
Very truly yours,
P & ARCfII TFX,Z'S AND ENiGI4EEE2.S , P.A.
7, �
,,,
Michael S. Acqu , P.E.
MSA/la
cc: John C. Vest, P.E.

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State_ of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
P.O. Box 29535
Raleigh, NC 27626-0535
WATER QUALITY SECTION
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