NC0023868_Permit modification_19961008

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State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
Mr. Steve Shoaf
City of Burlington
Post Office Box 1358
Burlington, North Carolina 27216
Dear Mr. Shoaf:
EDEF--I N F=1
October 8, 1996
Subject: NPDES Permit Modification
NPDES No. NC0023868
City of Burlington -East WWTP
NPDES No. NC0023876
City of Burlington -South WWTP
Alamance County
On February 19, 1996, the Division of Environmental Management issued NPDES
Permit No. NC0023868 to City of Burlington - East WWTP and Permit No. NC0023876 to
City of Burlington -South WWTP. A review of the permit files have indicated that a few
errors were inadvertently made in the permit. Accordingly, we are forwarding herewith
modifications to the subject permit to correct the errors.
Specifically, the following corrections have been made to the NPDES Permit No.
NC0023868 for the City of Burlington - East WWTP:
1) On the Effluent and Limitations and Monitoring Requirements Summer sheet, the Total
Phosphorus and Orthophosphate sample types will be changed from grab to composite, and
2) On the Effluent and Limitations and Monitoring Requirements Winter sheet, the BOD, 5-
day, and Total Suspended Residue daily maximum limits have been changed to weekly
averages.
In addition, the following correction has been made to the NPDES Permit No.
NC0023876 for the City of Burlington - South WWTP: the Conductivity measurement
frequency has been changed from daily to three times a week (3/week) during June, July,
August, and September and once a week (1/week) during the remainder of the year. A
footnote has also been added to explain the monitoring frequency.
The three changes referenced in this letter also eliminate inconsistencies between the
East and South wastewater treatment facilities' discharge permits.
Please find enclosed the modified sections of the permit referenced in the preceding paragraph.
Replace the original sections in your permit with the newer enclosed sections and discard the
original sections. All other terms and conditions contained in the original permit 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.
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 •

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Mr. Steve Shoat.
October 8, 1996
Page
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
27611-7447. Unless such demand is made, this decision shall be final and binding.
If you have any questions concerning these permit modifications, please contact Paul B. Clark
at telephone number [phone], extension 580.
Sincerely,
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Preston Howard, Jr., P.E.
cc: Central Files
Winston-Salem Regional Office, Water Quality Section
Permits and Engineering Unit
Facility Assessment Unit
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A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - SUMMER (April 1- October 31)
Permit No. NC0023868
During the period beginning on the effective date of the permit 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
Flow
BOD, 5-Day, 20°C 2
Total Suspended Residue 2
NH3 as N
Dissolved Oxygen 3
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Orthophosphate 5
Chronic Toxicity 6
Conductivity 7
Footnotes:
Discharge Limitations
Monthly Avg. Weekly Avg.
12.0 MGD
12.0 mg/1 18.0 mg/1
30.0 mg/1 45.0 mg/1
4.0 mg/1
200/100 ml
2.0 mg/14
400/100 ml
Monitoring
Measurement
Daily Max. Frequency
Continuous
Daily
Daily
Daily
Daily
Daily
Daily
Daily
Monthly
Monthly
.3/week--
Quarterly
3/week
Requirements
Sample Sample
Type Location 1
Recording
Composite
Composite
Composite
Grab
Grab
Grab
Grab
Composite
Composite
Composite,
Composite
Grab
I or E
E, I
E, I
E.
E, U, D
E, U, D
E
E, U, D
E
E, U, D
E
E, U, D
1 Sample locations: E - Effluent, I - Influent, U - Upstream, D - Downstream. For instream monitoring requirements, see Part III,
Condition G.
2 The monthly average effluent BOD5 and total suspended residue concentrations shall not exceed 15% of the respective influent value.
3 The daily average dissolved oxygen effluent concentrations shall not be less than 5.0 mg/l.
4 Sampling shall be based on upon a quarterly average of weekly sampling.
5 Orthophosphate monitoring is only required during the months of June, July, August, and September.
6 Chronic Toxicity (Ceriodaphnia) P/F at 36%. Samples shall -be taken quarterly during the months of February, May, August, and November; See Part
III, Condition H.
7 Conductivity monitoring will be required 3/week'during June, July, August, and September and once/week for the remainder of the year.

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - SUMMER (Continued) Permit No. NC0023868
Effluent Characteristics Discharge Limitations Monitoring Requirements
Measurement Sample Sample
Monthly Avg. Weekly Avg. Daily Max. Frequency Type Location
Cadmium 5.6 µg/1 12.6 µg/1 Weekly Composite E
Lead 70.0 µg/1 95.0 µg/1 Weekly Composite E
Cyanide 14.0 µg/1 56.0 µg/1 Weekly Grab E
Copper Monthly Composite E
Zinc Monthly Composite E
Fluoride Monthly Composite E
Silver Monthly Composite E
Chlorides Monthly Composite E
Footnotes (Continued):
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - WINTER (November 1 - March 31)
Permit No. NC0023868
During the period beginning on the effective date of the permit and lasting until expiration, the Permittce is authorized to discharge from
outfall(s) serial number 001. Such discharges shall be limited and monitored by the Permittce as specified below:'
Effluent Characteristics
Flow
BOD, 5-Day, 20°C 2
Total Suspended Residue 2
NH3 as N
Dissolved Oxygen 3
Fecal Coliform (geometric
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Chronic Toxicity 5
Conductivity 6
Discharge Limitations
Monthly Avg. Weekly Avg.
12.0 MGD
24.0 mg/1 36.0 mg/I .
30.0 mg/1 45.0 mg/1
8.0 mg/1
mean) 200/100 ml 400/100 ml
2.0 mg/14
Monitoring Requirements
Measurement Sample Sample
Daily Max. Frequency Tyne Location 1
Continuous Recording I or E
Daily Composite E, I
Daily Composite E, I
Daily Composite E
Daily Grab E, U, D
Daily Grab E, U, D
Daily Grab E
Daily Grab E, U, D
Monthly Composite E
Monthly Composite E, U, D .
Quarterly Composite E
3/week Grab E, U, D
Footnotes:
t Sample locations: E - Effluent, I - Influent, U - Upstream, D - Downstream. For instream monitoring requirements, see Part III,
Condition G.
2 The monthly average effluent BOD5 and total suspended residue concentrations shall not exceed 15% of the respective influent value.
3 The daily average dissolved oxygen effluent concentrations shall not be less than 5.0 mg/1.
4 Sampling shall be based upon a quarterly average of weekly sampling.
5 Chronic Toxicity (Ceriodaphnia) P/F at 36%. Samples shall be taken quarterly during the months of February, May, August, and November; See Part
III, Condition H.
6 Conductivity monitoring will be required 3/week during June, July, August, and September and once/week for the remainder of the year.

A. O. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - WINTER (Continued) Permit No. NC0023868
Effluent Characteristics Discharge Limitations Monitoring Requirements
Measurement Sample Sample
Monthly Avg. Weekly Avg. Daily Max. Frequency Type Location
Cadmium 5.6 µg/1 12.6 µg/1 Weekly Composite E
Lead 70.0 µg/I 95.0 µg/I Weekly Composite E
Cyanide 14.0 WI 56.0 µg/l Weekly Grab E
Copper Monthly Composite E
Zinc Monthly Composite E
Fluoride Monthly Composite E
Silver Monthly Composite E
Chlorides Monthly Composite E
Footnotes (continued):
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
There shall be no discharge of floating solids or visible foam in other than trace amounts.