NC0021229_Permit (Modification)_19951211

State of North Carolina
' Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor WIL
Jonathan B. Howes, Secretary p FEE N �
A. Preston Howard, Jr., P.E., Director
December 11, 1995
The Honorable Wayne S. Stafford
Town of Old Fort
Post Office Box 520
Old Fort, North Carolina 28762
Subject: NPDES Permit Modification
NPDES Permit No. NCO021229
Town of Old Fort WWTP
McDowell County
Dear Mayor Stafford:
On April 28, 1995, the Division of Environmental Management issued NPDES Permit No.
NCO021229 to the Town of Old Fort Waste Water Treatment Plant. A review of the permit file has
indicated that an error was inadvertently made in the permit. Accordingly, we are forwarding herewith
modifications to the subject permit to correct the error. These permit modifications are to the monitoring
requirements pages. The modification changes the testing months for Chronic toxicity to March, June,
September, and December.
Please find enclosed amended monitoring requirements pages which should be inserted into your
permit. The old pages should be discarded. All other terms and conditions contained in the original pernut
remain unchanged and in full effect. These permit modifications are issued pursuant to the requirements
of North Carolina General Statutes 143-215.1 and the Memorandum of Agreement between North
Carolina and the U. S. Environmental Protection Agency.
If any parts, measurement frequencies or sampling requirements contained in this permit modification
are unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty
(30) days following receipt of this letter. This request must be in the form of a written petition,
conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of
Administrative Hearings, Post Office Drawer 27447, Raleigh, North Carolina 276 1 1-7447. Unless such
demand is made,this decision shall be final and binding.
If you have any questions concerning these permit modifications, please contact Mary Cabe at
telephone number(919)733-5083, extension 518.
Sincerely,
Preston Howard, Jr., P
cc. Central Files
Asheville Regional Office,Water Quality Section,Mike Parker
Permits and Engineering Unit
Facility Assessment Unit
Larry A.usley
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10% post-consumer paper

A. (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS -FINAL Permit No. NCO021229
During the period beginning on the effective date of the permit and lasting until expansion above 0.8 MGD or expiration, the Permittee is
authorized to discharge from outfall(s) serial number 001. Such discharges shall be limited and monitored by the Permittee as specified below:
Effluent Characteristics Discharge Limitations Monitoring Requirements
Measurement Sample 'Sample
Monthly. Avg, Weekly Avg, Daily Max. Frequency Type Location
Flow 0.8 MGD Continuous Recording I or E
BOD, 5-Day, 20°C 30.0 mg/l 45.0 mg/1 3/Week Composite E
BOD, 5-Day, 200C 3/Week Grab I
TSS 30.0 mg/I 45.0 mg/I 3/Week Composite E
TSS 3/Week Grab I
NH3 as N Weekly Composite E
Fecal Coliform (geometric mean) 200.0 /100 ml 400.0 /100 ml 3/Week . Grab E
Total Residual Chlorine 28.0 µg/I 3/Week Grab E
Temperature 3/Week Grab E
Total Phosphorus Quarterly Composite E
Total Nitrogen (NO2 + NO3 + TKN) Quarterly Composite E
Chronic Toxicity" Quarterly Composite E
Cadmium 1.8 µg/I Weekly Composite E
Cyanide 23.0 µg/I Weekly Composite E
Copper 2/Month Composite E
Zinc 2/Month Composite E
Sample locations: E- Effluent, I- Influent
Chronic Toxicity (Ceriodaphnia) P/F at 22%; March, June, September, and December; See Part.III,Condition G.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units at the effluent. Effluent monitoring shall be conducted 3/week by grab
samples.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
•

A. (2). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - SUMMER (April 1 - October 31) Permit No. NCO021229
During the period beginning upon expansion above 0.8 MGD and lasting until expiration, the Petmittee is authorized to discharge from
outfall(s)serial number 001. Such discharges shall be limited and monitored by the Permittee as specified below: "
Effluent Characteristics Discharge Limitations Monitoring Requirements
Measurement same .Sample
Monthly. Avg, Weekly Avg, Daily Max. Freauencv Type Location
Flow 1.2 MGD Continuous Recording I or E
BOD, 5-Day, 20°C 30.0 mg/1 45.0 mg/1 3/Week Composite E
BOD, 5-Day, 200C 3/Week Grab I
TSS 30.0 mg/1 45.0 mg/1 3/Week Composite E
TSS 3/Week Grab I
NH3 asN 3.0 mg/1 3/Week Composite E
Dissolved Oxygen' 3/Week. Grab E,U,D
Fecal Coliform (geometric mean) 200.0 /100 ml 400.0 /100 ml 3/Week Grab E,U,D
Total Residual Chlorine 28.0 µg/I 3/Week Grab E
Temperature Daily Grab E,U,D
Total Phosphorus Monthly Composite E
Total Nitrogen (NO2 + NO3 + TKN) Monthly Composite E
Chronic Toxicity— Quarterly Composite E
Cadmium 1.5 µg/I Weekly Composite E
Cyanide 18.0 µg/I Weekly Composite E
Conductivity 3/Week Grab E,U,D
Copper 2/Month Composite E
Zinc 2/Month Composite E
* Sample locations: E- Effluent, I - Influent, U - Upstream of discharge location, D - Downstream at the mouth of Curtis Creek. Upstream and
downstream samples shall be grab samples. Stream samples shall be collected three times per week during June,July, August, and September and
once per week during the remaining months of the year.
** The daily average dissolved oxygen concentration shall not be less than 5.0 mg/l.
*** Chronic Toxicity (Ceriodaphnia) P/F at 28%; March, June, September, and December See Part III,Condition H.
The pli shall not be less than 6.0 standard units nor greater than 9.0 standard units at the effluent. Effluent monitoring shall be conducted 3/week by grab
samples.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. (3). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - WINTER (November 1 - March 31) Permit No. NCO021229
During the period beginning upon expansion above 0.8 MGD and lasting until expiration, the Permittee is authorized to discharge from
outfall(s) serial number 001. Such discharges shall be limited and monitored by the Permittee as specified below:
Effluent Characteristics Discharge Limitations Monitoring Requirements
Measurement Sample 'Sample
Monthly. Avg, Weekly Avg, Daily 'Max. Freguency Type Location
Flow 1.2 MGD Continuous Recording I or E
BOD, 5-Day, 200C 30.0 mg/I 45.0 mg/I 3/Week Composite E
BOD, 5-Day, 200C 3/Week Grab I
TSS 30.0 mg/I 45.0 mg/I 3/Week Composite E
TSS 3/Week Grab I
NH3 asN 8.0 3/Week Composite E
Dissolved Oxygen" 3/Week Grab E,U,D
Fecal Coliform (geometric mean) 200.0 /100 ml 400.0 /100 ml 3/Week Grab E,U,D
Total Residual Chlorine 28.0 µg/I 3/Week Grab E
Temperature Daily Grab E,U,D
Total Phosphorus Monthly Composite E
Total Nitrogen (NO2 + NO3 + TKN) Monthly Composite E
Chronic Toxicity— Quarterly Composite E
Cadmium 1.5 µg/I Weekly Composite E
Cyanide 18.0 µg/I Weekly Composite E
Conductivity 3/Week Grab E,U,D
Copper 2/Month Composite E
Zinc 2/Month Composite E
* Sample locations: E - Effluent, I- Influent, U - Upstream of discharge location, D - Downstream at the mouth of Curtis Creek. . Upstream and
downstream samples shall be grab samples. Stream samples shall be collected three times per week during June, July, August, and September and
once per week during the remaining months of the year.
*** Chronic Toxicity (Ceriodaphnia) P/F at 28%; March,June, September, and December; ; See Part III, Condition H.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units at the effluent. Effluent monitoring shall be conducted 3/week by grab
samples.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
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