NC0040797_Speculative Limits_19901108

NPDES DOCUMENT SCANNING COVER SHEET
NC0040797
Henry Fork WWTP
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
November 8, 1990
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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 George T. Everett, Ph.D.
William W. Cobey, Jr., Secretary Director
November 8, 1990
Kenneth M. Barrett, P.E.
HDR Engineering, Inc.
Suite 1400
128 S. Tryon Street
Charlotte, NC 28202-5001
Subject: City of Hickory - Henry Fork WWTP
NPDES No. NC0040797
Catawba County
Dear Mr. Barrett:
Your letter of Oct. 19, 1990 to Mr. Steve Tedder regarding speculative discharge limits for an
expansion of the Henry Fork WWTP to 9.0, 12.0, and 15.0 MGD was referred to my office.
Additional information is needed to do a complete analysis of NPDES permit limits for the
expansions. Since your proposed expansion(s) are greater than 0.5 MGD, an Environmental
Assessment must be prepared. Please contact Alan Clark of the Water Quality Planning Group at
[phone] for guidance. Additional information which will be required to complete a
wasteload allocation include an updated Headworks Analysis and a recent priority pollutant scan.
The Division is initiating a basinwide management strategy for the state. 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 Catawba River
should be promulgated by 1995 and a draft version will hopefully be available to the public sometime
in 1994. In the meantime, the City of Hickory can expect revised limits and monitoring requirements
upon expansion. Limits or monitoring requirements for constituents such as Copper, Cyanide,
Cadmium, Chromium, Nickel, Lead, Zinc, Silver, and Mercury can be expected. Color is likely to
be an issue due to Hickory's textile wastes. Limits which protect against instream ammonia toxicity
will be required. Summer and winter limits of approximately 2 mg/1 and 4 mg/1 respectively are
anticipated. The BOD5 limit may be revised as well. Quarterly whole effluent toxicity testing will
continue to be required. The instream waste concentration (IWC) for the toxicity test will depend on
the magnitude of the expansion. The IWC may increase to as high as 48% for a 15 MGD facility. In
addition, dechlorination to 0.028 mg/1 or alternate disinfection will be required upon expansion.
The above limits are speculative and are for use in an engineering review of discharge alternatives.
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

-2-
Final limits will be provided upon receipt of an application for permit modification. If you have any
questions regarding the above issues, please contact Betsy Johnson or myself at [phone].
JTC/,
cc: Alan Clark
Don Safrit
Rex Gleason
Central Files
ely,
revor Clements
Assistant Chief, Water Quality Section
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

October 19, 1990
Mr. Steve W. Tedder, Chief
Water Quality Section
Division of Environmental Management
Department of Environment, Health,
and Natural Resources
P.O. Box 27687
Raleigh, NC 27611
Re: City of Hickory
Henry Fork Wastewater Treatment Plant
NPDES No. NC 0040797
HDR Project No. 00231-005-018
Dear Mr. Tedder:
I-D:1
MB 24 199C
WATER QUALITY
SECTION
We are currently conducting a treatment plant evaluation and expansion study
for the City of Hickory's Henry Fork Wastewater Treatment Plant located north
of NCSR 1144, south of Hickory in Catawba County (NPDES Permit No. NC 0040797).
In order to evaluate process requirements and treatment alternatives, we are
requesting your section project effluent limitations for any regulated
parameter if the WWTP were to be expanded and permitted to treat monthly
average discharge flows of 9 MGD, 12 MGD, and 15 MGD.
If there are any questions, do not hesitate to contact me. I will be
contacting you by telephone within the next few weeks to determine the time
frame for which this information may be provided.
Thank you for your cooperation in this matter.
Very truly yours,
HDR Engineering, Inc. o North Carolina
<enneth M. Barrett, P.E.
Vice President
KMB/det
c: Jerry Twiggs
HDR Engineering, Inc.
of North Carolina
Suite 1400
128 S. Tryon Street
Charlotte, North Carolina
28202-5001
Telephone
704 338-1800

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INSTREAM SELF -MONITORING DATA
MONTHLY AVERAGES
Discharger: kzc on LIL4)7?
Receiving Stream: E Mew. reek_
Upstream Location:
DATE
DEC-90
NOV-90
OCT-90
SEP-90
AUG-90
JUL-90
JUN-90
MAY-90
APR-90
MAR-90
FEB-90
JAN-90
DEC-89
NOV-89
OCT-89
SEP-89
AUG-89
JUL-89
JUN-89
MAY-89
APR-89
MAR-89
FEB-89
AN- 8 9
DEC-88
NOV-88
OCT-88
SEP-88
AUG-88
JUL-88
JUN-88
MAY-88
APR-88
MAR-88
FEB-88
JAN-88
DEC-87
NOV-87
OCT-87
SEP-87
AUG-87
JUL-87
JUN-87
MAY-87
APR-87
MAR-87
FEB-87
JAN-87
Permit No .: NCH jO 717
Sub -basin:
Downstream Location
Upstream
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