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Home My WebLink AboutNC0023876_Permit Modificaton_20020812• State of North Carolina Department of Environment and Natural Resources Division of Water Quality Michael F. Easley, Governor William G. Ross, Jr., Secretary Alan W. Klimek, P.E., Director August 12, 2002 Mr. Stephen R. Shoaf City of Burlington P.O. Box 1358 Burlington, North Carolina 27216 A7rA NCDENR NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES Subject: NPDES Permit Modification Permit NC0023876 South Burlington WWTP Alamance County Dear Mr. Shoaf: On April 19, 2002, a final permit for the subject facility became effective. It has since come to our attention that the dissolved oxygen limit, which in your previous permit had been 6 mg/L, was erroneously printed as 5 mg/L. This error has been corrected — your dissolved oxygen limit continues to be (as in your previous permit) 6 mg/L. Please find enclosed the revised permit pages. The revised pages should be inserted into your permit. The old pages may then be discarded. All other terms and conditions contained in the original permit remain unchanged and in full effect. This permit modification is issued under 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 a written petition conforming to Chapter 150B of the North Carolina General Statutes, filed with the Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless such demand is made, this decision shall be final and binding. If you have any questions concerning this permit modification, please contact Natalie Sierra at (919) 733- 5083, extension 551. cc: Mooresville Regional Office, Water Quality Section MVO Vnit 4 Point Source Compliance and Enforcement Central Files EPA Region 4 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Sincerely, 1,3,---941. 6-IL" an W. Klimek Telephone (919) 733-5083 FAX (919) 733-0719 An Equal Opportunity Affirmative Action Employer VISIT US ON THE INTERNET @ httpi/h2o.enr.state.nc.us/NPDES Permit NC0023876 A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS — FINAL During the period beginning on the effective date of this permit and lasting until expiration, the•Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: "EFFLUENT CHARACTERISTICS LIMITS MONITORING REQUIREMENTS Monthly Average: Weekly Average Daily :Maximum :Measurement Frequency Sample -_Type ,Sample Locations. , Flow 12.0 MGD Continuous Recording Influent or Effluent BOD, 5 day, 20°C2 (April 1— October 31) 9.0 mg/I 13.5 mg/I Daily Composite Influent, Effluent BOD, 5 day, 20°C2 (November 1— March 31) 18.0 mg/I 27.0 mg/I -Daily Composite Influent, Effluent Total Suspended Residue2 30.0 mg/I 45.0 mg/I Daily Composite Influent, Effluent NH3 as N (April 1— October 31)3 3.0 mg/1 Daily Composite Effluent NH3 as N (November 1—March 31)3 6.0 mg/L Daily Composite Effluent Dissolved Oxygen's Daily Grab Effluent, Upstream, Downstream Fecal Coliform (geometric mean) 200 / 100 ml 400 / 100 ml Daily Grab Effluent, Upstream, Downstream Total Residual Chlorine Daily Grab Effluent Temperature (9C) Daily Grab Effluent, Upstream, Downstream Total Nitrogen (NO2 + NO3 + TKN) Monthly Composite Effluent Total Phosphorus5 - 2.0 mg/I (Quarterly Average) Weekly Composite Effluent, Upstream, Downstream Chronic Toxicity6 Quarterly Composite Effluent Conductivity? Weekly Composite Effluent, Upstream, Downstream Cyanidee 5.8 µg/1 20.0 µg/l Weekly Grab Effluent Total Copper Monthly Composite Effluent Total Zinc Monthly Composite Effluent Total Silver Monthly Composite Effluent OP Weekly Grab Effluent Footnotes: 1 Sample locations: For instream monitoring requirements and sample locations, see Part A. (3.). Instream monitoring requirements shall be waived as long as the facility continues to participate in the Upper Cape Fear River Basin Association. 2 The monthly average BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value (85% removal). 3 The Division may re -open this permit to require weekly average limits for ammonia. After calculating allowable concentrations, the Division will perform an analysis of past ammonia data to determine if there is a reasonable potential for this discharge to exceed these potential limits. If there is, this permit will be re -opened. If there is not, the permit will not be re -opened, but will contain weekly average limits for ammonia upon renewal. 4 The daily dissolved oxygen effluent concentration shall not be less than 6.0 mg/]. 5Compliance shall be based upon a quarterly average of weekly samples 6 Chronic Toxicity (Ceriodaphnia) P/F at 86% in January. April, July and October (see Part A (2.)) 7 Conductivity samples shall be collected three tines per week firma June -September and once per week the remainder of the year. See Part A. (3.) for additional information BThe quantitation limit for cyanide shall be 10 ug/1 (10 ppb). Levels reported at less than 10 ug/1 shall be considered zero for compliance purposes. 9 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored weekly at the effluent by grab sample. There shall be no discharge of floating solids or visible foam in other than trace amounts.