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HomeMy WebLinkAboutNC0021474_Final Permit_20060918TF9 Michael F. Easley QG Governor Q r William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources `/ Alan W. Klimek, P.E., Director W __ _ Division of Water Quality September 18, 2006 Mrs. Linda Holt City of Mebane 106 E. Washington St. Mebane, North Carolina 27302 Subject: Issuance of NPDES Permit Permit NCO021474 City of Mebane W WTP Alamance County Dear Mrs. Holt: Division personnel have reviewed and approved your application for renewal of the subject permit. Accordingly, we are forwarding the attached NPDES discharge permit. This permit is issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency dated May 9, 1994 (or as subsequently amended). The following modifications from the draft permit are included in the final permit: • The mercury limit will remain in the permit but it was modified to a weekly average limit. The Division considers all values reported on DMR as valid data unless the facility can document that a laboratory error or contamination occurred and the result is no longer valid. • Nutrient monitoring frequencies were modified from 3/week to weekly. Weekly average limits for ammonia were established according to the Implementation Policy developed by the Division in 2002 and can't be modified as requested. The policy is enclosed for your information. If any parts, measurement frequencies or sampling requirements contained in this permit 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 (6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless such demand is made, this decision shall be final and binding. Please note that this permit is not transferable except after notice to the Division. The Division may require modification or revocation and reissuance of the permit. This permit does not affect the legal requirements to obtain other permits which may be required by the Division of Water Quality or permits required by the Division of Land Resources, the Coastal Area Management Act or any other Federal or Local governmental permit that may be required. North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone (919) 733-5083 Internet: h2o.enrstate.nc.us 512 N. Salisbury St. Raleigh, NC 27604 FAX (919) 733-0719 An Equal OODortuniN/Affirmative Action Emobver- 50% Racveed/10% Post Consumer Prater NorthCarolina NUaturatty Customer Service 1-877-623-6748 Permit No. NC0021474 City of Mebane W WTP Page 2 If you have any questions concerning this permit, please contact Teresa Rodriguez at telephone number (919) 733-5083,extension 553. Sincerely, /� °� k' ,(vi Alan W. Klimek, P.E. Cc: NPDES Files Raleigh Regional Office — Surface Water Protection Aquatic Toxicology Unit USEPA Region 4 Permit No. NCO021474 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIXIINATION SYSTEM In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards and regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water Pollution Control Act, as amended, City of Mebane is hereby authorized to discharge wastewater from a facility located at Mebane Wastewater Treatment Plant 635 Corrigidor Road (SR 1997) southwest of Mebane Alamance County to receiving waters designated as Moadams Creek in the Cape Fear River Basin in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, lII and IV hereof. This permit shall become effective November 1, 2006. This permit and authorization to discharge shall expire at midnight on May 31, 2011. Signed this day September 18, 2006. - Alan W. Klimek, P.E., 15irector Division of Water Quality By Authority of the Environmental Management Commission Permit No. NC0021474 SUPPLEMENT TO PERMIT COVER SHEET All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of this permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements, terms, and provisions included herein. City of Mebane is hereby authorized to: Continue to operate an existing 2.5 MGD wastewater treatment facility located at the Mebane Wastewater Treatment Plant, on 635 Corrigidor Road (NCSR 1997), southwest of Mebane, Alamance County, and consisting of: • influent bar screen • grit chamber • dual aeration basins • three final clarifiers • sand filters • chlorine contact chamber • dechlorination • aerobic sludge digestors 2. Discharge from said treatment works at the location specified on the attached map into the Moadams Creek, which is classified C-NSW waters in the Cape Fear River Basin. s^��,, � / z� lu � � l �' 4:� V • 1 �; �j--'� 11 �� � �' l��ti / ii 2 M •+ ' • �7�$C 1 � : b. v d . .A % •• �G ` ai. 2 r.ay, • �. ♦ � x A_ • ll ?" Y i ys> __ � 8 • ___ _ *tYJI aq • \ • � ;k.v . 3tix' L.-l. 1 �ss 1 t • y_ � �. • • s Outfa11001 % �';--�, ;' •�•�•�. ✓ v 1 � �' .705 X ' , �, sS � 1 /' • ••, z • � � :� �Upf Ifi' , 962 • • )) , ark 7� . + . ,. • 650 . 1 • `J f ` City of Mebane WWTP l� Facility Location State Grld/Ound: C21SE/Mebane Latitude: 36005'20" not to scale Longitude: 79' 17' 15" Receiving Stream: Moadams Creek Drainage Basin: Cape Fear River IVPDES Permit No. NC0021474 Stream Class: C-NSW Sub -Basin: 03-06-02 North Alamance County Permit No. NC0021474 . A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS During the period 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 LIMITS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample Type Sample Locationt Flow 2.5 MGD Continuous Recording Influent or Effluent Total Monthly Flow Monitor and Report Monthly Recorded or calculated Influent or Effluent BOD, 5 day, 20°C2 (April 1 through October 31) 5.0 mg/L 7.5 mg/L Daily Composite Influent & Effluent BOD, 5 day, 20'C2 (November 1 through March 31) 10.0 mg/L 15.0 mg/L Daily Composite Influent & Effluent Total Suspended Solids2 30.0 mg/L 45.0 mg/L Daily Composite Influent & Effluent NH3 as N (April 1 through October 31) 2.0 mg/L 6.0 mg/L Daily Composite Effluent NH3 as N (November 1 through March 31) 4.0 mg/L 12.0 mg/L Daily Composite Effluent Dissolved Oxygen' Daily Grab Effluent pH" Daily Grab Effluent Temperature Daily Grab Effluent Fecal Coliform (geometric mean) 200/ 100 ml 400/100 ml Daily Grab Effluent Total Residual Chlorine 17ug/L Daily Grab Effluent Conductivity Daily Grab Effluent Total Nitrogen Weekly Composite Effluent TKN Weekly Composite Effluent NO3-N+NO2-N Weekly Composite Effluent TN Load6 Monitor and Report (lb/mo) Monthly Calculated Effluent Total Phosphorus' 2.0 mg/L quarterly average Weekly Composite Effluent TP Load6 Monitor and Report (Ib/mo) Monthly Calculated Effluent Fluoride 1.8 mg/L Weekly Composite Effluent Total Mercury' 0.012ug/L Weekly Grab Effluent Total Copper 2JMonth Composite Effluent Total Zinc 2/Month Composite Effluent Chloride 2/Month Composite Effluent Chronic Toxicity' Quarterly Composite Effluent Effluent PollutantScan'O Annually Grab Effluent Notes: 1. For instream sampling locations and requirements, see Supplement to Effluent Limitations A (2). Instream monitoring requirements may be provisionally waived per Condition A (3). 2. The monthly average effluent BODE and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal). Permit No. NCO021474 3. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/L. 4. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units. 5. TN = TKN + NO3-N + NOZ-N, where TN is total nitrogen, TKN is is Total Kjeldahl Nitrogen, and NO3- N and NO2-N are Nitrate and Nitrite Nitrogen, respectively. 6. TN or TP Load is the mass quantity of Total Nitrogen and Total Phosphorus discharged in a given period of time. See Special Condition A. (6) Calculation of Mass Loads 7. The quarterly average for total phosphorus shall be the average of composite samples collected weekly during each calendar quarter. 8. Mercury samples shall be analyzed using EPA Method 1631E. 9. Chronic Toxicity (Ceriodaphnia) P/F at 90% with testing in January, April, July and October (see Supplement to Effluent Limitations A (4)). 10. See Condition A. (7). There shall be no discharge of floating solids or visible foam in other than trace amounts. Permit No. NCO021474 , SUPPLEMENT TO EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SPECIAL, CONDITIONS A. (2) INSTREAM MONITORING REQUIREMENTS Parameter Sample Type Frequency Samplin Location Dissolved Oxygen Grab 3/Wk (June -Sept) 1/Wk (October - May) U, D1, D2, D3 Temperature Grab 3/Wk (June -Sept) 1Mk(October -May) U,D1,D2,D3 Fecal Coliform Grab 3/Wk (June -Sept) 1/Wk (October- May) U, D1, D2, D3 Conductivity Grab 3/Wk (June -Sept) 1/Wk (October- May) U, D1, D2, D3 SAMPLE LOCATIONS 1. U -Upstream 100 feet of discharge, DI -Downstream at NCSR 1940, Moadams Creek, D2 - Downstream at Back Creek at NCSR 1936, and D3 - Downstream at Back Creek at NC Highway 54. A. (3) PROVISIONAL WAIVER OF INSTREAM MONITORING REQUIREMENTS Instream monitoring requirements in this NPDES permit shall be provisionally waived so long as the Permittee remains a member of the Upper Cape Fear River Basin Association and the Association continues to function as approved by the Division and Environmental Management Commission. If the Permittee does not participate in the Association or if the Association ceases to function, the instream monitoring requirements in this permit become effective immediately; and the Division may reopen this permit by administrative letter to establish additional instream monitoring requirements, it deems necessary to adequately characterize the effects of the discharges on water quality in the receiving stream. Permit No. NCO021474 A. (4) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 90%. The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The tests will be performed during the months of January, April, July and October. Effluent sampling for this testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes. If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the two following months as described in "North Carolina Phase lI Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The chronic value for multiple concentration tests will be determined using the geometric mean of the highest concentration having no detectable impairment of reproduction or survival and the lowest concentration that does have a detectable impairment of reproduction or survival. The definition of "detectable impairment," collection methods, exposure regimes, and further statistical methods are specified in the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the parameter code TGP3B for the pass/fail results and TBP313 for the Chronic Value. Additionally, DWQ Form AT-3 (original). is to be sent to the following address: Attention: North Carolina Division of Water Quality Environmental Sciences Section 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section no later than 30 days after the end of the reporting period for which the report is made. Test data shall be complete, accurate, include all supporting chemical/physical measurements and all concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream. Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number, county, and the month/year of the report with the notation of "No Flow" in the comment area of the form. The report shall be submitted to the Environmental Sciences Section at the address cited above. Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be required during the following month. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include alternate monitoring requirements or limits. NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day of the month following the month of the initial monitoring. Permit No. NC0021474 A. (5) NUTRIENT MONITORING RE -OPENER Pursuant to N.C. Gen. Stat. Section 143-215.1 and the implementing rules found in Title 15A of the North Carolina Administrative Code, Subchapter 2H, specifically, 15A NCAC 2H.0112(b)(1) and 2H.0114(a), and Part 11, Sections B-12 and B-13 of this Permit, the Director of DWQ may reopen this permit to require supplemental nutrient monitoring of the discharge. The additional monitoring will be to support water quality modeling efforts within the Cape Fear River Basin, and shall be consistent with a monitoring plan developed jointly by the Division and affected stakeholders. A. (6) CALCULATION OF MASS LOADS a. The permitte shall calculate monthly and annual TN (or TP) loads as follows: Monthly TN (or TP) Loads = TN (or TP) x TMF x 8.34 Where: TN (or TP) = the average Total Nitrogen (or Total Phosphorus) concentration (mg/L) of the composite samples collected during the month. TMF = the total monthly flow of wastewater discharged during the month (MG/mo) 8.34 = conversion factor, from (mg/L x MG) to pounds ii. Annual TN (or TP) Load (lb/yr) = Sum of 12 monthly TN (or TP) Loads for calendar year. b. The pemvtte shall report monthly total nitrogen and total phosphorus results (mg/L and lb/mo) in the appropriate discharge monitoring report for each month and shall report each year's results (lb/yr) with the December report for that year. Permit No. NCO021474 A. (7) EFFLUENT POLLUTANT SCAN The permittee shall perform an annual Effluent Pollutant Scan for all parameters listed in the table below (in accordance with 40 CFR Part 136). The annual effluent pollutant scan samples shall represent seasonal (summer, winter, fall, spring) variations over the 5-year permit cycle. Unless otherwise indicated, metals shall be analyzed as "total recoverable." Additionally, the method detection level and the minimum level shall be the most sensitive as provided by the appropriate analytical procedure. Ammonia (as N) Chlorine (total residual, Dissolved oxygen Nitrate/Nitrite Total Kjeldahl nitrogen Oil and grease Total Phosphorus Total dissolved solids Hardness Antimony Arsenic Beryllium Cadmium Chromium Copper Lead Mercury* Nickel Selenium Trans-1,2-dichloroethylene TRC) 1,1-dichloroethylene 1,2-dichloropropane 1,3-dichloropropylene Ethylbenzene Methyl bromide Silver Thallium Zinc Cyanide Total phenolic compounds Volatile organic cWound: Acrolein Acrylonitrile Benzene Bromoform Carbon tetrachloride Chlorobenzene Chlorodibromomethane Chloroethane 2-chloroethylvinyl ether Chloroform Dichlorobromomethane 1,1-dichloroethane 1,2-dichloroethane Methyl chloride Methylene chloride 1,1,2,2-tetrachloroethane Tetrachloroethylene Toluene 1,1,1-trichloroethane 1,1,2-trichloroethane Trichloroethylene Vinyl chloride Acid -extractable mnsg2oundr: P-chloro-m-cresol 2-chlorophenol 2,4-dichlorophenol 2,4-dimethylphenol 4,6-dinitro-o-cresol 2,4-dinitrophenol 2-nitrophenol 4-nitrophenol Pentachlorophenol Phenol 2,4,6-trichlorophenol Base -neutral combound . Acenaphthene Acenaphthylene Anthracene Benzidine Benzo(a)anthracene Benzo(a)pyrene 3,4 benzofluoranthene Benzo(ghi)perylene Benzo(k)fluoranthene Bis (2-chloroethoxy) methane Bis (2-chloroethyl) ether Bis (2-chloroisopropyl) ether Bis (2-ethylhexyl) phthalate 4-bromophenyl phenyl ether Butyl benzyl phthalate 2-chloronaphthalene 4-chlorophenyl phenyl ether Chrysene Di-n-butyl phthalate Di-n-octyl phthalate Dibenzo(a,h)anthracene 1,2-dichlorobenzene 1,3-dichlorobenzene 1,4-dichlorobenzene 3,3-dichlorobenzidine Diethyl phthalate Dimethyl phthalate 2,4-dinitrotoluene 2,6-dinitrotoluene 1,2-diphenylhydrazine Fluoranthene Fluorene Hexachlorobenzene Hexachlorobutadiene Hexachlorocyclo-pentadiene Hexachloroethane Indeno(1,2,3-cd)pyrene Isophorone Naphthalene Nitrobenzene N-nitrosodi-n-propylamine N-nitrosodimethylamine N-nitrosodiphenylamine Phenanthrene Pyrene 1,2,4-trichlorobenzene Test results shall be reported to the Division in DWQ Form- DMR-PPAI or in a form approved by the Director, within 90 days of sampling. A copy of the report shall be submitted to Central Files to the following address: Division of Water Quality, Water Quality Section, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617. *Mercury samples shall be analyzed using EPA Method 1631.