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Home My WebLink AboutNC0043532_Permit (Issuance)_20001113NPDES DOCUMENT SCANNING COVER SHEET NPDES Permit: NC0043532 West Stanly / Oakboro WWTP 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 13, 2000 This document is pririted on reuse paper - ignore any content on the resrerse side State of North Carolina Department of Environment and Natural Resources Division of Water Quality James B. Hunt, Jr., Governor Bill Holman, Secretary Kerr T. Stevens, P.E., Director November 13, 2000 The Honorable Joyce Little, Mayor Town of Oakboro P.O. Box 610 Oakboro, North Carolina 28129 Dear Mayor Little: QTA DENR Subject: NPDES Permit Issuance Permit No. NC0043532 Town of Oakboro WWTP Stanly County 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 have been made to the permit: • A limit of 33.8 µg/I for lead has been included at both the Long Creek and Rocky River discharge points. The limit is added based on the reasonable potential for levels of lead from your discharge to approach the stream standard for this parameter. The Division urges you to identify and reduce sources of lead in your system. • Effluent monitoring for chromium, nickel, mercury, arsenic, and cyanide has been removed from the permit. • Twice per month monitoring for copper, silver and zinc will be required at the Long Creek discharge point. • Effluent monitoring for zinc will be removed upon relocation to the Rocky River discharge point. • Twice per month monitoring for copper and silver will be required at the Rocky River discharge point. ,47 • There were two typographical errors in the draft permit on A.(2). Effluent Limitations and Monitoring Requirements that have been corrected. 1) An NH3 limit (April 1— October 31) of 30 mg/I has been removed. 2) The daily maximum lead limit of 33 ug/1 has been corrected to 33.8 ug/l. It has been confirmed that upon relocation to the Rocky River, the facility will use outfall 001, Long Creek, as a gravity discharge only in cases of emergency when failure of the pump station or force main would prevent discharge to outfall 002, the Rocky River. A lockable valve box with manually turned weir plates will be installed at the 001 discharge pipe after relocation. 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone 919-733-5083 FAX 919-733-0719 An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper 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 a demand is made, this permit shall be final and binding. Please notice that this permit is not transferable. Part II, E.4. addresses the requirements to be followed in case of change in ownership or control of this discharge. 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, Coastal Area Management Act, or any other Federal or Local governmental permits may be required. If you have any questions or need additional information, please contact Ms. Jacquelyn Nowell at telephone number (919) 733-5083, extension 512. Sincerely, Original Signed By David A Goodrich Kerr T. Stevens cc: Central Files Mooresville Regional Office / Water Quality Section Aquatic Toxicology Unit Point Source Compliance/Enforcement Unit Permit No. NC0043532 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION 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, The Town of Oakboro is hereby authorized to discharge wastewater from a facility located at Oakboro Wastewater Treatment Plant Off of NCSR 1953 East of Oakboro Stanly County to receiving waters designated as Long Creek (outfall 001) and the Rocky River (outfall 002) in the Yadkin — Pee Dee River Basin in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III and IV hereof. This permit shall become effective December 1, 2000 This permit and authorization to discharge shall expire at midnight on February 29, 2004 Signed this day November 13, 2000 Original Signed By David A. Goodrich Kerr T. Stevens, Director Division of Water Quality By Authority of the Environmental Management Commission Permit No. NC0043532 SUPPLEMENT TO PERMIT COVER SHEET The Town of Oakboro is hereby authorized to: 1. Continue to operate a 0.50 MGD wastewater treatment plant consisting of a manual bar screen, an aerated grit chamber, influent pump station, instrumented flow measurement, aeration basin with mechanical aerators, dual secondary clarifiers, chlorine contact basin, dual aerated sludge digesters, aerated sludge holding basin, dual sludge drying beds, and a standby electric generator located at the Town of Oakboro WWTP, off of NCSR 1953, east of Oakboro, Stanly County, and 2. Construct facilities for relocation of the outfall to the Rocky River (002), and 3. After receiving an Authorization to Construct from the Division of Water Quality, construct facilities for expansion of the wastewater treatment plant to 0.9 MGD, the • addition of an influent pump, aerated grit removal system, and step screen system, • expansion of the aeration basins with installation of one mixer for each basin, • installation of a clarifier splitter box with adjustable weirs, • installation of a 205,620 gallon clarifier, • expansion of the existing chlorine contact chamber with addition of a dechlorination unit, • a 389,000 gallon aerobic sludge digester with two floating aerators, one floating mixer, a floating decant mechanism, and additional pumps, • installation of one emergency generator, • additional piping, valves, control equipment and appurtenances. with discharge to the Rocky River (Outfall 002), and 4. To continue to discharge from said treatment works at the locations specified on the attached map into Long Creek (001), and upon relocation to discharge to the Rocky River (002). Both locations are classified C waters in the Yadkin -Pee Dee River Basin. Town of Oakboro WWTP State Grid1USGS Quad: Latitude: (001) 35° 14' 08" N Langibude (001) 80° 16' 00" W Permitted Flow: 0.5 MGD, 0.9 MGD Receiving Stream Long Creek & Rocky River Stream Claw both C G17NE/ Oakboro Latitude (002) 35° 12' 41" N Latitude (002) 80° 15' 16" W Drainage Bassin: Yadkin --Pee Dee Sub -Basin: 03-07-13 Facility Location not to scale 610,1k NPDFS Permit No. NC0043532 Star11y County A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0043532 During the period beginning ON THE EFFECTIVE DATE OF THE PERMIT AND LASTING UNTIL RELOCATION TO THE ROCKY RIVER, EXPANSION OR UNTIL EXPIRATION, the Permittee is authorized to discharge from outfall serial number 001 (Long Creek). After relocation to the Rocky River. this outfall may be used as an emergency backup outfall. in case of pump station failure. 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 Location1 Flow 0.5 MGD Continuous Recording I or E BOD, 5 day, 20°C2 30.0 mg/I 45.0 mg/I 3/week Composite E, I Total Suspended Residue2 30.0 mg/I 45.0 mg/I . 3/week Composite E, NH3 as N (April 1 - October 31) 4.0 mg/I 3/week Composite E NH3 as N (November 1 - March 31) 14.0 mg/I 3/week Composite E Dissolved Oxygen3 • 3/week Grab E, U, D+ pH4 3/week Grab E Fecal Coliform (geometric mean) 200 / 100 ml 400 / 100 ml 3/week Grab E, U, D+ Total Residual Chlorine 3/week Grab E Total Nitrogen (NO2 + NO3 + TKN) Quarterly Composite E Total Phosphorus Quarterly Composite E Temperature °C Daily Grab E Temperature °C 3/week Grab U, D+ Conductivity 3/week Grab U, D+ Chronic Toxicity5 Quarterly Composite E Lead _ 33.8 pg/I 2/Month ' '• Composite E Copper 0 2/Month Composite E Silver 2/Month Composite E Zinc 2/Month Composite E Notes: 1 Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above the discharge point, D - Downstream below the discharge point at NCSR 1917. + Instream samples shall be grab samples and shall be collected 3/week during the months of June through September and once per week during the remaining months of the year. 2 The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent value (85% removal). 3 The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/I. 4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units. 5 Chronic Toxicity (Ceriodaphnia) P/F at 19%; January, April, July, and October; See Special Condition A (5) of the Supplement to Effluent Limitations. There shall be no discharge of floating solids or visible foam in other than trace amounts. A. (2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0043532 During the period beginning UPON RELOCATION TO THE ROCKY RIVER AND LASTING UNTIL EXPANSION OR EXPIRATION, the Permittee is authorized to discharge from outfall serial number 002 (Rocky River). 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 Location1 Flow 0.5 MGD Continuous Recording I or E BOD, 5 day, 20°C2 30.0 mg/I 45.0 mg/I 3/week Composite E, I Total Suspended Residue2 30.0 mg/I 45.0 mg/I 3/week Composite E, I NH3 as N (April 1 - October 31) 3/week Composite E NH3 as N (November 1 - March 31) - 3/week Composite E Dissolved Oxygen3 3/week Grab E, U, D+ pH4 3/week Grab E Fecal Coliform (geometric mean) 200 / 100 ml 400 / 100 ml 3/week Grab E, U, D+ Total Residual Chlorine 3/week Grab E Total Nitrogen (NO2+ NO3+TKN) Quarterly Composite E Total Phosphorus Quarterly Composite E Temperature °C Daily Grab E Temperature °C 3/week Grab U, D+ Conductivity 3/week Grab U, D+ Chronic Toxicity5 . Quarterly Composite E Lead 33.8 pg/I Weekly Composite E Copper 2/Month Composite E Silver 2/Month Composite E Notes: 1 Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above the discharge point, D - Downstream 1.7 miles below the discharge point (at the end of or close to NCSR 1659). + lnstream samples shall be grab samples and shall be collected 3/week during the months of June through September and once per week during the remaining months of the year. 2 The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent value (85% removal). 3 The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/I. 4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units. 5 Chronic Toxicity (Ceriodaphnia) P/F at 2.6%; January, April, July, and October; See Special Condition A (6) of the Supplement to Effluent Limitations. There shall be no discharge of floating solids or visible foam in other than trace amounts. A. (3) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0043532 . During the period beginning UPON EXPANSION AND LASTING UNTIL RELOCATION TO THE ROCKY RIVER OR EXPIRATION, the Permittee is authorized to discharge from outfall serial number 001 (Long Creek). After relocation to the Rocky River. this outfall may be used as an emergency backup outfall, in case of pump station failure. 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 Location1 Flow 0.9 MGD Continuous Recording I or E BOD, 5 day, 20°C2 (April 1 - October 31) 9.0 mg/I 13.5 mg/I 3/week Composite E, I BOD, 5 day, 20°C2 (November 1 - March 31) 18.0 mg/I 27.0 mg/I 3/week Composite E, I Total Suspended Residue2 30.0 mg/I 45.0 mg/I 3/week Composite E, I NH3 as N (April 1 - October 31) 2.8 mg/I 3/week Composite E NH3 as N (November 1 - March 31) 6.0 mg/I 3/week Composite E Dissolved Oxygen3 3/week Grab E, U, D+ pH4 3/week Grab E Fecal Coliform (geometric mean) 200 / 100 ml 400 / 100 ml 3/week Grab E, U, D+ Total Residual Chlorine 28 pg/I 3/week Grab E Total Nitrogen (NO2 + NO3 + TKN) Quarterly Composite E Total Phosphorus Quarterly Composite E Temperature °C Daily Grab E Temperature °C 3/week Grab U, D+ Conductivity 3/week Grab U, D+ Chronic Toxicity5 Quarterly Composite E Lead 33.8 pg/l 2/Month Composite E Copper 2/Month Composite E Silver 2/Month Composite E Zinc 2/Month Composite E Notes: • 1 Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above the discharge point, D - Downstream 1.7 miles below the discharge point (at the end of or close to NCSR 1659). + Instream samples shall be grab samples and shall be collected 3/week during the months of June through September and once per week during the remaining months of the year. . 2 The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent value (85% removal). 3 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/I. 4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units. 5 Chronic Toxicity (Ceriodaphnia) P/F at 30%; January, April, July, and October; See Special Conditions A (7) of the Supplement to Effluent Limitations. There shall be no discharge of floating solids or visible foam in other than trace amounts. . A.(4) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0043532 During the period beginning UPON EXPANSION AND RELOCATION TO THE ROCKY RIVER AND LASTING UNTIL EXPIRATION, the Permittee is authorized to discharge from outfall serial number 002 (Rocky River). 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 Location Flow 0.9 MGD Continuous Recordin ' I or E BOD, 5 day, 20°C2 (April 1 - October 31) 9.0 mg/I 13.5 mg/I 3/week Composite E, I BOD, 5 day, 20°C2 (November 1 - March 31) 18.0 mg/I 27.0 mg/l 3/week Composite E, I Total Suspended Residue2 30.0 mg/I 45.0 mg/I 3/week Composite E, I NH3 as N (April 1 - October 31) 3.0 mg/l 3/week Composite E NH3 as N (November 1 - March 31) 6.0 mg/I 3/week Composite E Dissolved Oxygen3 3/week Grab E, U, D+ pH4 • 3/week Grab E Fecal Coliform (geometric mean) 200 / 100 ml 400 / 100 ml 3/week Grab E, U, D+ Total Residual Chlorine 28 erg/I 3/week Grab E . Total Nitrogen (NO2 + NO3 + TKN) Quarterly Composite E Total Phosphorus Quarterly Composite E Temperature °C Daily Grab E Temperature °C 3/week Grab U, D+ Conductivity 3/week Grab U, D+ Chronic Toxicity5 Quarterly Composite E Lead 33.8 pg/I Weekly Composite E Copper 2/Month Composite E Silver 2/Month Composite E Notes: . 1 Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above the discharge point, D - Downstream 1.7 miles below the discharge point (at the end of or close to NCSR 1659). + Instream samples shall be grab samples and shall be collected 3/week during the months of June through September and once per week during the remaining months of the year. 2 The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent value (85% removal). 3 The daily average dissolved oxygen effluent concentration shall not be Tess than 5.0 mg/I. 4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units. s Chronic Toxicity (Ceriodaphnia) P/F at 4.6%; January, April, July, and October; See Special Condition A (8) of the Supplement to Effluent Limitations. There shall be no discharge of floating solids or visible foam in other than trace amounts. Permit No. NC0043532 SUPPLEMENT TO EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SPECIAL CONDITIONS A (5). CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) @ 0.5 MGD (LONG CREEK) The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 19 %. 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 11 Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The tests will be performed during the months of March, June, September, and December. 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 II 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 11 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 THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the following address: Attention: Environmental Sciences Branch North Carolina Division of Water Quality 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch 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 Branch 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. NC0043532 SUPPLEMENT TO EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SPECIAL CONDITIONS A (6). CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) @ 0.5 MGD (RocKY RIVER) The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 2.6%. 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 11 Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The tests will be performed during the months of March, June, September, and December. 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 1I 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 11 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 THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the following address: Attention: Environmental Sciences Branch North Carolina Division of Water Quality 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch 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 Branch 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. NC0043532 SUPPLEMENT TO EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SPECIAL CONDITIONS A (7). CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) @ 0.9 MGD (LoNc CREEK) The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 30%. 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 1I Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The tests will be performed during the months of March, June, September, and December. 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 1I 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 THP3B for the Chronic Value. Additionally. DWQ Form AT-3 (original) is to be sent to the following address: Attention: Environmental Sciences Branch North Carolina Division of Water Quality 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch 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 Branch 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. NC0043532 SUPPLEMENT TO EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SPECIAL CONDITIONS A (8). CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) @ 0.9 MGD (Rom( RIVER) The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 4.6%. 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 March, June, September, and December. 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 11 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 11 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 THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the following address: Attention: Environmental Sciences Branch North Carolina Division of Water Quality 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch 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 Branch 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. --/ZIRo rice. .ds go` AtAij fr.�rf‘r 1 o,sA169 r c`.� uoih, i �. tAji Permit fi1o. NC0043 2 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION 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, The Town of Oakboro is hereby authorized to discharge wastewater from a facility located at Oakboro Wastewater Treatment Plant Off of NCSR 1953 East of Oakboro Stanly County to receiving waters designated as Long Creek (outfall 001) and the Rocky River (outfall 002) in the Yadkin — Pee Dee River Basin in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III and IV hereof. This permit shall become effective This permit and authorization to discharge shall expire at midnight on February 29, 2004 Signed this day DRAFT Kerr T. Stevens, Director Division of Water Quality By Authority of the Environmental Management Commission DENR/DWQ1 FACT SHEET FOR NPDES PERMIT DEVELOPMENT NPDES No. NC00435325 Facility Information '` ,' Applicant/Facility Name: Town of Oakboro/Oakboro WWTP Applicant Address: P.O. Box 610 Oakboro, NC 28129 Facility Address: Off of NCSR 1953 East of Oakboro Permitted Flow 0.5, 0.9 MGD Type of Waste: Domestic and Industrial Facility/Permit Status: Renewal Facility Classification III County: Stanly Miscellaneous Receiving Stream: Long Creek: relocating to Rocky River Regional Office: Mooresville Stream Classification: C USGS Topo Quad: G17NE/ Oakboro, N.C. 303(d) Listed?: No Permit Writer: Jackie Nowell Subbasin: 03-07-13 Date: August 29, 2000 Drainage Area (mi2): 192.5; 965 (Rocky R.) > ; 's; ih' r; Summer 7Q10 (cfs) 3.3; 29 (Rocky R.) Winter 7Q10 (cfs): 5.8; 51 (Rocky R.) Average Flow (cfs): 183; 920 (Rocky R.) IWC (%): 19%; 2.6% (Rocky R.) Primary SIC Code: 4952 SUMMARY OF FACILITY AND WASTELOAD ALLOCATION The Town of Oakboro WWTP has requested renewal of existing permit. Facility is a 0.500 MGD plant that discharges into Long Creek, which is classified C. The facility will be expanding to 0.9 MGD and relocating its outfall to the Rocky River. Long Creek and the Rocky River (030713) are not listed on DWQ's final draft 2000 303d list. Staff report indicates that Town requested approval to construct a pump station and 12,700 linear feet of force main for the relocation. Plant capacity after construction will be 1.2 MGD, but current permit will only cover up to 0.9 MGD. (Town has not requested expansion to 1.2 MGD.) Oakboro will be able to accept wastewater from nearby towns, such as Locust and Stanfield. ,In 1993, a QUAL2E model was performed on Rocky River and Mallard Creek to assist with the 'management of wastewater discharge issues in the upper watershed of the Rocky River. It was recommended that no new or expanded discharges be permitted in the study area unless an evaluation of engineering alternative shows that it is the environmentally sound alternative. If new or expanded discharges are permitted, they will receive BAT technology limits in the watersheds above the confluence of Mallard Creek and the Rocky River, due to severely limited assimilative capacity. Any new or expanding discharge in the lower watersheds of the Rocky River should receive a total BODu limit of 32 mg/1 or less, equivalent to 10 mg/1 BODS and 4 mg/1 NH3 for typical domestic discharges. This level of treatment will protect the DO standard as well as preventing any one discharge from exhausting 100% of the available assimilative capacity of the river. The existing limits at Long Creek site, at 0.5 MGD are BOD5= 30 mg/1, summer and winter NH3 limits of 4 and 14 mg/1, respectively, DO = 6 mg/1, TSS =30 mg/1, Fecal = 200/100m1, cyanide of 26 ug/1, mercury of 0.063 ug/l, twice per month monitoring of arsenic, chromium, nickel, lead, copper, zinc, and silver. Oakboro also has a quarterly chronic toxicity limit of 19% in January, April, July, October. TP and TN are also monitored quarterly. Oakboro WW'I'I' Fact. Sheet. NPDES Renewal Page 1 Upon relocation to Rocky River with s7Q10= 29 cfs, w7Q10= 51 cfs, QA= 920 cfs. At 0.5 MGD, 30/30 limits with DO=6 mg/l, Chronic tox limit of 2.6% in Jan Apr Jul Oct. Twice per month monitoring for arsenic, chromium, cyanide, mercury, nickel, lead, copper, zinc, and silver. Upon expansion to 0.9 MGD: Summer Winter BOD5 9 mg/1 18 mg/1 NH3 3 mg/1 6 mg/1 DO 5 mg/1 5 mg/1 TSS 30 mg/1 30 mg/1 Fecal 200/100m1 200/100m1 TRC 28 ug/1 28 ug/1 Monitoring for As, Cr, CN, Hg, Ni, Pb, Cu, Zn, Ag MRO: Need to verify the following with the Town: Upon relocation to Rocky River, the facility will use outfall 001, Long Creek, as a gravity discharge only in cases of failure of the pump station or force main that would prevent discharge to outfall 002, the Rocky River. A lockable valve box with manually turned weir plates will be installed at the 001 discharge pipe after relocation. TOXICITY TESTING: Current Requirement: at Long Creek @ 0.5 MGD: 1) Chronic Toxicity Ceriodaphnia P/F @ 19%; Jan Apr Jul Oct Upon Relocation to Rocky River: 2) @ 0.5 MGD Chronic Toxicity Ceriodaphnia P/F @ 2.6%; Jan Apr Jul Oct, 3) @ 0.9 MGD Chronic Toxicity Ceriodaphnia P/F @ 4.6%; Jan Apr Jul Oct Oakboro has a quarterly chronic tox test of 19% at the Long Creek location. Since 1996, the facility has eight (8) FAILS, with the most recent one occurring in January 2000. There were four fails in '98, April and May, and October and November. April 1997 was FAIL as were July and August 1996. COMPLIANCE SUMMARY: In 1999, Oakboro WWTP had one permit exceedance with flow at 0.5123 MGD in February. The averages between April 1999 and March 2000 were Qw = 0.3259 MGD, BOD5 =4.68 mg/1, TSS = 6.4 mg/1, and NH3 = 0.61 mg/l. In 1998, there were two permit exceedances for flow in January and February. The averages between April 1998 and March 1999 were Qw = 0.4033 MGD, BOD5 =3.50 mg/1, TSS = 5.7 mg/1, and NH3 = 1.25 mg/l. In 1997, there was one permit exceedance for flow in December. The averages between April 1997and March 1998 were Qw = 0.4485 MGD, BOD5 =6.07 mg/1, TSS = 6.8 mg/1, and NH3 = 2.54 mg/l. INSTREAM MONITORING: Oakboro is a participant in the c000rdinated instream monitoring in the Yadkin -Pee Dee River basin and entered into a memorandum of agreement with DWQ. Individual instream monitoring was waived for their facility. PROPOSED CHANGES: • at Long Creek discharge point - drop monitoring for Cr, Nickel, Mercury, Arsenic, and cyanide • A daily maximum limit of 33.8 ug/1 for lead. • Twice per month monitoring for Copper, silver and zinc. • at Rocky River discharge point are drop monitoring for Cr, Nickel, Mercury, Arsenic, zinc and cyanide. • A daily maximum limit of 33.8 ug/1 for lead. • Twice per month monitoring for Copper and silver. Oakboro WWTP Fact Sheet NPDES Renewal Page 2 PROPOSED SCHEDULE FOR PERMIT ISSUANCE: Draft Permit to Public Notice: 9/20/00 Permit Scheduled to Issue: 11/6/00 STATE CONTACT: If you have any questions on any of the above information or on the attached permit, please contact Jackie Nowell at (919) 733-5038 ext. 512. /44, azt.46-r/t- 4t/Iter_Y 2-44 21_eeezw_ /4 /4e/le, nee.W e 2 ,etc' 1�`D /f%CE 442 0, gee ritj / Cavu44 544 ,rrcZ6)4 /4?a-5 64-tt -4444- O d° I/ ' H.. ". NAME- d'Orr-Ge/‘Y-"Zt-DATE: NPDES SUPERVISOR COMMENT: NAME: 7), �l /Hal) r446-,-- -raoi ei,v/f-Avt.t/7/, )4a-:4,./ 6taLL- DATE: /b S 0 'j . 4.-e<1,,u 41f-- °0 sue,°kee , �Jr 1 (14/ Oakboro WWTP Fact Sheet NPDES Renewal Page 3 PUBLIC NOTICE STATE OF NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSIOWNPDES UNIT 1617 MAIL SERVICE CENTER RALEIGH. NORTH CAROLINA 2T999-1617 NOTIFICATION OF INTENT TO ISSUE A NPDES W0SSTENWTER PERMIT on the basis or thorough staff renew and appli- cation of NC General Stable 143.21. Public law 02-500, and other lawful standards and repute - lions, the North Carolina Environmental Manage- ment Commission proposes to issue a National Pollutant Discharge Elimination System (NPDES) wastewater discharge lo the person(s) listed on the etmched pages effective 45 days from the publish date of this notice. Vaitten comments regarding the proposed permit wig be accepted until 30 days after the publish date of this notice. All comments received prior to that date are considered in the final determina- tions regarding the proposed permit The Director of the NC Division of Water Quality may decide to hold a public meeting for the proposed permit should the division receive a significant degree of public interest. Copies of the draft permit and other supporting information on file used to determine conditions present in the draft permit are avaiade upon request and payment of the costs of reproduction. Mar comments and/or requests for information to the NC Division of Water Quality at the above address or call Ms. Christie Jackson at (919)733- 5083. extension 538, Please ndirde the NPOES permit number (attached) in any communication. Interested persons may also visit the Division of Water Quality al 512 Nor Salisbury Street Raleigh. NC 27604-1148 behveen the hours or 8:00am5:00pm to review Information on file. NPDES Permit NC0043532. 0akboro Town. 1NWTP. PO Bea 610. Oakb0ro, NC 28129 has applied for a permit renewal for a teary located in Stably County discharging treated wastewater into long Creek {relocating to the Rocky River) In the Yadkin -Pee Dee River Basin. Currently NH3 and dissolved oxygen are water quality limited. This discharge may affect future allocations in this portion e1 the receiving stream. September 17. 2000 Stanly News Press 237 W. North St. P.O. Box 488 Albemarle, NC 28002 Phone: 704 982-2121 Fax: 704 983-7999 Ad Number: 19849 Ad Classification: 300 Ad Type: Legal Payment Method: Bil ed Customer: APHY NCDENR/DWQ/BUDGET OFFICE PO BOX 29535 RALEIGH, NC 27626-0535 Customer Phone: (919) 733-5083 I� 6 LJLS O U E IP EEP 1 9 2000 0 DE.RR - WATER QUALITY Putty SOURCE BRANCH Original Salesperson: CHRISTYH Salesperson Generating Bill: CHRISTYH Initial text: PUBLIC NOTICE STATE Start: 09/17/00 Stop: 09/17/00 Total inserts: 1 Publication: Start: Stop: Stanly NewsPress 09/17/00 09/17/00 Gross: $ 65.94 Surcharge: 0.00 Total: 65.94 Credits: 0.00 Amt paid: 0.00 Amt due: 65.94 Inserts: 1 MRO Staff Report — (NPDES NC0043532 Permit Renewal) SOC PRIORITY PROJECT: NO To: Permits and Engineering Unit Water Quality Section Attention: Charles H. Weaver, Jr. Date: June 22, 1999 NPDES STAFF REPORT AND RECOMMENDATI County: Stanly NPDES Permit No.: NC0043532 MRO No.: 99-098 PART I - GENERAL INFORMATION Page 1 of 4 TITTUF JUN 24 1999 DENR - WATER QUALITY POINT SOURCE BRANCH 1. Facility and Address: Town of Oakboro WWTP Mailing Address Physical Address PO Box 610 24939-B Barbees Grove Rd. Oakboro, NC 28129 Oakboro, Stanly County 2. Date of On -site Investigation: June 18, 1999 3. Report Prepared By: Charley Schwartz, Environmental Engineer 4. Person Contacted and Telephone Number: Main Contact: Larry Branch (Phone# (704)485-8322) ORC Name: Troy Branch (Cert# 16896; Phone# (704)485-4613) Backup ORC: Lloyd Curlee 5. Directions to Site: From the intersection of NC Highway 138 and SR 1953 east of the Town of Oakboro, travel northeast on SR 1953 (Barbees Grove Rd) approximately 2.2 miles to the junction with a paved road (no road name or number). The WWTP is located north of the junction at the end of the paved road. 6. Discharge Point(s), List for all discharge Points: - Long Creek Latitude: 35 ° 14' 08" Longitude: 80° 16' 00" Rocky River 35° 12' 41" 80° 15' 16" Attach a USGS Map Extract and indicate treatment plant site and discharge point on map. USGS Quad No.: G 17 NE USGS Quad Name: Oakboro, NC 7. Site size and expansion area consistent with application: Yes. There is ample area available for expansion. MRO Staff Report — (NPDES NC0043532 Permit Renewal) Page 2 of 4 8. Topography (relationship to flood plain included): Sloping east towards the receiving stream at the rate of 5-10%. The WWTP is not located within the 100 year flood plain. 9. Location of Nearest Dwelling: One dwelling is approximately 1,000 feet from the WWTP site. 10. Receiving Stream or Affected Surface Waters: Long Creek a. Classification: C b. River Basin and Subbasin No.: Yadkin 03-07-13 c. Describe receiving stream features and pertinent downstream uses: The receiving stream is 30-45 feet wide at the outfall. The channel bottom was not visible at the time of the site visit on account of the high sediment load and water discoloration of Long Creek (brown to purple color). d. The permittee has plans to relocate the outfall to the Rocky River (Class C). The Rocky River is of considerable size at the proposed outfall. The width of the River is approximately 90-120 feet with a depth of 1-5 feet. PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS 1. a. Volume of Wastewater (Actual Flow from DMRs): 0.3967 MGD b. What is the current permitted capacity: 0.50 MGD c. Current design capacity: 0.50 MGD d. Date(s) and construction activities allowed by previous ATCs issued in the previous two years: 12/29/97 ATC application — The permittee requested approval to construct a pump station and 12,700 linear feet of force main in order to relocate the WWTP outfall to Rocky River. A staff report recommending issuance of the ATC was submitted to Raleigh by this Office on January 14, 1998, but a final approval letter is not in this Office's files. However, a revised permit was issued by the Division on August 3, 1998 that presented discharge limits at an allowed Rocky River outfall location. 8/25/98 ATC application — The permittee proposed modifications to the facility as identified in item "f." below. The ATC was approved by the Division on December 2, 1998. e. Description of existing or substantially constructed WWT facilities: The existing WWT facilities consist of a manual bar screen, aerated grit chamber, comminutor (not in use), instrumented flow measurement, dual aeration basins with mechanical aerators (one aeration basin is used as a sludge holding basin), dual clarifiers, dual 12,750-gallon aerated sludge digesters, chlorine disinfection, dual sludge drying beds, and standby power. f. Description of proposed WWT facilities: The proposed facilities will have a design capacity of 1.2 MGD, although the facility is to be permitted for only 0.9 MGD. The following alterations and additions to the existing facility are MRO Staff Report — (NPDES NC0043532 Permit Renewal) g• Page 3 of 4 proposed: addition of 100 HP influent pump, installation of a clarifier splitter box, installation of a 205,620-gallon clarifier, expansion of the existing aeration basins, expansion of the existing chlorination basin, addition of a dechlorination unit, addition of a 389,000-gallon aerobic sludge digester with two floating aerators. Possible toxic impacts to surface waters: The facility receives industrial wastewater and chlorine is added to the waste stream; however, the facility consistently passes toxicity tests. h. Pretreatment Program (POTWs only): The facility has an approved pretreatment program. 2. Residual handling and utilization/disposal scheme: a. If residuals are being land applied specify DWQ Permit No.: WQ0005387 Residuals Contractor: Wheelabrator Water Technologies, Inc. Telephone No. (704)732-8500 b. Residuals stabilization: PSRP c. Landfill: N/A 3. Treatment Plant Classification: Class III (New rating sheet is attached; however, no change from previous rating). 4. SIC Code(s): 4952 Wastewater Code(s): Primary — 01; Secondary - 55 5. MTU Code(s): 02013 PART III - OTHER PERTINENT INFORMATION 1. Is this facility being constructed with Construction Grant Funds or are any public monies involved (municipals only)? This facility was constructed with public monies. 2. Special monitoring or limitations (including toxicity) requests: None at this time. 3. Important SOC/JOC or Compliance Schedule dates: N/A 4. Alternative Analysis Evaluation a. Spray Irrigation: Insufficient area and steep sloped topography b. Connect to regional sewer system: N/A c. Subsurface: Insufficient area and steep sloped topography d. Other disposal options: N/A MRO Staff Report — (NPDES NC0043532 Permit Renewal) PART IV - EVALUATION AND RECOMMENDATIONS Page 4 of 4 At the time of the site visit, the existing plant appeared to be well operated. Several of the treatment system additions and modifications proposed in the August 25, 1998 ATC application were observed to be under construction. Upon completion of construction the plant will have a total design capacity of 1.2 MGD. The Oakboro WWTP is being expanded such that it will be capable of accepting wastewater from the towns of Locust and Stanfield and accommodating anticipated growth within the area. Plans for the collection systems to bring Stanfield's and Locust's wastewater to the plant are still in the early stages (PERs recently submitted to the Division). Since construction at the plant is not complete, any new permit should include limits associated with flows of 0.5 MGD and 0.9 MGD. In addition, the limits should cover discharges at the Rocky River and Long Creek outfall locations (Outfall piping to Rocky River is not complete, and the Long Creek outfall is intended to remain as a backup discharge location). It is recommended that the NPDES Permit be renewed as requested. CfA3-791 Signature fReport Preparer Date Water Quali egional h:\\npdes\oakboro.doc Supervi sor Date Permit Notes NC0043532 The Town of Oakboro WWTP has requested renewal of existing permit. Facility is a 0.500 MGD plant that discharges into Long Creek, which is classified C. The facility will be expanding to 0.9 MGD and relocating its outfall to the Rocky River. Long Creek and the Rocky River (030713) are not listed on DWQ's final draft 2000 303d list. Staff report indicates that Town requested approval to construct a pump station and 12,700 linear feet of force main for the relocation. Plant capacity after construction will be 1.2 MGD, but current permit will only cover up to 0.9 MGD. (Town has not requested expansion to 1.2 MGD.) Oakboro will be able to accept wastewater from nearby towns, such as Locust and Stanfield. 8/29/00 — Telecon with Larry Branch, Utilities Director — the construction for the relocation has been completed, however they have just finalized all financial and contract matters with the engineer, and still need to send the certification of completion. They have discharged to the relocation point on Rocky River just on a trial basis to test the pipe for leaks, etc. He will contact the engineer so that the completion information can be sent to us. Model Background In 1993, a QUAL2E model was performed on Rocky River and Mallard Creek to assist with the management of wastewater discharge issues in the upper watershed of the Rocky River. Also determined the appropriate WLA for the CMUD-Mallard Creek WWTP. This calibrated model for 47.6 miles in the Yadkin River Basin was used to predict DO and BOD demand concentrations at low flow conditions for both permitted and summer average discharge conditions. Model results indicated that water quality in the upper watershed was not adequately protected by the NPDES permit limits. Under actual flows, which were well below permitted loads, the DO standard was not predicted to be violated in the Rocky River. But three DO sags are predicted to drop to or near the stream standard, indicating little assimilative capacity remains for oxygen consuming wastes. It was recommended that no new or expanded discharges be permitted in the study area unless an evaluation of engineering alternative shows that it is the environmentally sound alternative. If new or expanded discharges are permitted, they will receive BAT technology limits in the watersheds above the confluence of Mallard Creek and the Rocky River, due to severely limited assimilative capacity. Any new or expanding discharge in the lower watersheds of the Rocky River should receive a total BODu limit of 32 mg/1 or less, equivalent to 10 mg/1 BOD5 and 4 mg/1 NH3 for typical domestic discharges. This level of treatment will protect the DO standard as well as preventing any one discharge from exhausting 100% of the available assimilative capacity of the river. Existing Permit The existing limits at Long Creek site, at 0.5 MGD are BOD5= 30 mg/1, summer and winter NH3 limits of 4 and 14 mg/1, respectively, DO = 6 mg/1, TSS =30 mg/1, Fecal = 200/100m1, cyanide of 26 ug/l, mercury of 0.063 ug/1, twice per month monitoring of arsenic, chromium, nickel, lead, copper, zinc, and silver. Oakboro also has a quarterly chronic toxicity limit of 19% in January, April, July, October. TP and TN are also monitored quarterly. Permit Notes NC0043532 Page 2 If the Oakboro facility should expand to 0.9 MGD at Long Creek before relocating to Rocky River, limits would be: BOD5 NH3 DO TSS Fecal TRC Summer 9 mg/1 2.8 mg/1 5mg/1 30 mg/1 200/100m1 28 ug/1 Winter 18 mg/1 6 mg/1 5mg/1 30 mg/1 200/100m1 28 ug/1 Cyanide 17 ug/1 17 ug/1 Mercury 0.04 ug/1 0.04 ug/1 Monitoring for As, Cr, Ni, Pb, Cu, Zn, Ag Upon relocation to Rocky River with s7Q10= 29 cfs, w7Q10= 51 cfs, QA= 920 cfs. At 0.5 MGD, 30/30 limits with DO=6 mg/1, Chronic tox limit of 2.6% in Jan Apr Jul Oct. Twice per month monitoring for arsenic, chromium, cyanide, mercury, nickel, lead, copper, zinc, and silver. Upon expansion to 0.9 MGD: Summer BOD5 9 mg/1 NH3 3 mg/1 DO 5 mg/1 TSS 30 mg/1 Fecal 200/100m1 TRC 28 ug/1 Monitoring for As, Cr, CN, Winter 18 mg/1 6 mg/1 5mg/1 30 mg/1 200/100m1 28 ug/1 Hg, Ni, Pb, Cu, Zn, Ag Need to verify the following with the Town: Upon relocation to Rocky River, the facility will use outfall 001, Long Creek, as a gravity discharge only in cases of failure of the pump station or force main that would prevent discharge to outfall 002, the Rocky River. A lockable valve box with manually turned weir plates will be installed at the 001 discharge pipe after relocation. Review of Compliance Data In 1999, Oakboro WWTP had one permit exceedance with flow at 0.5123 MGD in February. The averages between April 1999 and March 2000 were Qw = 0.3259 MGD, BOD5 =4.68 mg/1, TSS = 6.4 mg/1, and NH3 = 0.61 mg/l. In 1998, there were two permit exceedances for flow in January and February. The averages between April 1998 and March 1999 were Qw = 0.4033 MGD, BOD5 =3.50 mg/1, TSS = 5.7 mg/1, and NH3 = 1.25 mg/1. In 1997, there was one permit exceedance for flow in December. The averages between April 1997and March 1998 were Qw = 0.4485 MGD, BOD5 =6.07 mg/1, TSS = 6.8 mg/1, and NH3 = 2.54 mg/1. Pretreatment Program Oakboro has a modified program, so only do a Short Term Monitoring Program (4 samples in the year before headworks is due). The last one was done in 1998 and the new STMP must Permit Notes NC0043532 Page 3 be run in July 2000 — April 2001. Pollutants of concern (POCs) — BOD,TSS, NH3, As, Cd, Cr, Cu, CN, Pb, Hg, Mo, Ni, Se, Ag, Zn POTW's one SIU (Stanley Knitting) - only has limits for CN. They also monitor for Cu + Pb. Rest of metals are in STMP only because of 40 CFR 503 **8/24/00 — MRO received letter that Stanley Knitting Mills will be closing its Oakboro plant starting on September 21, 2000. This closing will effect Oakboro's pretreatment program since it was the only SIU. Correspondence File See attached Instream Data June 1998 — Oakboro is a participant in the c000rdinated instream monitoring in the Yadkin -Pee Dee River basin and entered into a memorandum of agreement with DWQ. Individual instream monitoring was waived for their facility. April — May 1998 — Long Creek - Upstream site on at Bridge on Hartsell Rd. Downstream site at Bridge on Highway 138. DO values range from 7.7 to 8.3 mg/1 both upstream and downstream. Instream fecal coliform values < 60/100m1. Toxicity Test Results Oakboro has a quarterly chronic tox test of 19% at the Long Creek location. Since 1996, the facility has eight (8) FAILS, with the most recent one occurring in January 2000. There were four fails in '98, April and May, and October and November. April 1997 was FAIL as were July and August 1996. Upon relocation to Rocky River, the chronic test limit will be 2.6% at 0.5 MGD and 4.6% at 0.9 MGD. 8/29/00 — Telecon w/ Kevin Bowden — Aq Tox sent several NOVs for the noncompliance violations — not really known what caused the toxicity problems. No THE done or info from the Town on why they were failing. Last real contact with ESB was in 1989 when Black and Veetch (engineering firm) sent letter and felt that solids were causing problems. Recommends renewal of tox limit. Even with the potential for no SIUs in the future, because of Oakboro's past problems would not recommend immediate dropping of tox text without another year of testing with no FAILs. Reasonable Potential Analysis Performed analysis using DMR data from Jan. 1999 thru April 2000. Because of dilution in the Rocky River, allowable concentrations are greater for many Oakboro parameters of concern. Ran the analysis at four scenarios: 1) Existing location at Long Creek @ 0.5 MGD; 2) Existing location at Long Creek @ 0.9 MGD; 3) Relocation to Rocky River @ 0.5 MGD; 4) Relocation to Rocky River @ 0.9 MGD Permit Notes NC0043532 Page 4 Analysis results at Long Creek discharge point are drop monitoring for Cr, Nickel, Mercury, Arsenic, and cyanide. A limit is needed for lead because of reasonable potential shown. *Note that lead values reported in year 2000 appear to be high compared with 1999 data submitted. However, since this data was given reported and the Town has not notified DWQ of problems with lab, I will use the DMR data. A daily maximum limit of 33.8 ug/1 for lead. Only a daily max. limit will be given because it is more stringent than the weekly average limit of 131 ug/l. Twice per month monitoring for Copper and Zinc. Analysis results at Rocky River discharge point are drop monitoring for Cr, Nickel, Mercury, Arsenic, zinc and cyanide. A daily maximum limit of 33.8 ug/1 for lead. Twice per month monitoring for Copper. Recommend renewal of existing NPDES limits with some changes. • at Long Creek discharge point - drop monitoring for Cr, Nickel, Mercury, Arsenic, and cyanide A daily maximum limit of 33.8 ug/1 for lead. Twice per month monitoring for Copper, silver and Zinc. • at Rocky River discharge point are drop monitoring for Cr, Nickel, Mercury, Arsenic, zinc and cyanide. A daily maximum limit of 33.8 ug/1 for lead. Twice per month monitoring for Copper and silver. own oi Oahtoro P.O. Box 610 0akboro, North Carolina 28129 Telephone 704-485-3351 Fax 704-485-2439 August 24, 2000 Mr. John Lesley NCDENR Division of Water Quality Pretreatment Section 919 North Main Street Mooresville, NC 28115 Subject: Stanly Knitting Mills, Inc. Pretreatment Dear Mr. Lesley: Enclosed is a copy of a letter addressed to the Town of Oakboro from the office of Stanly Knitting Mills, Inc. notifying us of their intention to permanently close it's Oakboro facility. As you well know, Stanly Knitting Mills is our only Significant Industrial User (SIU). We are at present collecting quarterly samples for the updated Headworks Analysis due to Raleigh June 30, 2001, as outlined in letter dated February 14, 2000. This unfortunate news will affect and cease the Town of Oakboros' Pretreatment program as it is at present. Please notify this office of any advice or instructions regarding the demise of our Pretreatment Program, and sampling plan already under way. Thank you for your attention in this matter. Troy B. Branch Town of Oakboro Pretreatment Coordinator tbb/pretreatmentltr. enclosure: letter dated July 24, 200 from Stanly Knitting Mills, Inc cc: Dana Rees Folley, Pretreatment Staff, with enclosures itonly knitting mill:. inc. 349 South Main Street • P. O. Drawer 479 Oakboro, North Carolina 28129 Phone 704-485-3311 • Fax 704-485-8114 July 24, 2000 TO: Joyce Little Mayor Town of Oakboro 109 A N. Main Street Oakboro, NC 28129 FROM: Judy Meggs BR Director On July 24th Stanly Knitting Mills, Inc. notified its employees, including those affected, that its management has decided to close two of its facilities. One is known as the Main Street Plant and is located at 329 S. Main Street, Oakboro, NC. The other is known as the Richfield Plant and is located at 231 N. Hwy. 49, Richfield, NC. It is anticipated that the closure will be permanent. The closing will commence on September 21', 2000 and will continue through the end of the year. For further information contact Judy Means at 485-3311. JM/dl TOXICANT ANALYSIS Facility Name Oakboro WWTP NPDES # nc0043532 Ow (MGD) 0.5 7010s (cfs) 29 IWC (%) 2.60 c'ving Stream Rocky River Stream Class C FINAL RESULTS Cr Max. Pred Cw 7.5 ug/ Allowable Cw 1921.0 ug/ Max. Value 5 Cu Max. Pred Cw 3120 ug/ Allowable Cw 268.9 ug/ Max. Value 780 Pb Max. Pred Cw 1368 ug/ Allowable Cw 960.5 ug/ Max. Value 360 Ni Max. Pred Cw 10.2 ug/ Allowable Cw 3380.9 ug/ Max. Value 6.8 Ag Max. Pred Cw 3.75 ug/ Allowable Cw 2.3 ug/ Max. Value 2.5 Zn Max. Pred Cw 475 ug/ Allowable Cw 1921.0 ug/ Max. Value 250 Hg Max. Pred Cw 0.1 ug/ Allowable Cw 0.5 ug/ Max. Value 0.1 As Max. Pred Cw 8.48 ug/ Allowable Cw 1921.0 ug/ Max. Value 5.3 Cn Max. Pred Cw 16 ug/ Allowable Cw 192.1 ug/ Max. Value 10 Pay Ito" �1 M� Po-f) Alk Pkvf Puf 8/17/00 f OC4- . i d - c/1(311 s/L'il Facility Name NPDES # Ow (MGD) 7010s (cfs) AWC(%) 'ving Stream Stream Class Cr Max. Pred Cw Allowable Cw Max. Value Cu Max. Pred Cw 3120 Allowable Cw 152.5 Max. Value 780 Pb Max. Pred Cw 1368 Allowable Cw 544.7 Max. Value 360 Oakboro WWTP nc0043532 0.9 29 4.59 Rocky River C Ni Max. Pred Cw 10.2 Allowable Cw 1917.4 Max. Value 6.8 Ag Max. Pred Cw 3.75 Allowable Cw 1.3 Max. Value 2.5 Zn Max. Pred Cw 475 Allowable Cw 1089.4 Max. Value 250 Hg Max. Pred Cw Allowable Cw Max. Value As Max. Pred Cw 8.48 Allowable Cw 1089.4 Max. Value 5.3 Cn Max. Pred Cw 16 Allowable Cw 108.9 Max. Value 10 0 Max. Pred Cw 0 Allowable Cw 0.0 Max. Value 0 0 Max. Pred Cw 0 Allowable Cw 0.0 Max. Value 0 0 Max. Pred Cw Allowable Cw Max. Value FINAL RESULTS 7.5 1089.4 5 0.1 0.3 0.1 0 0.0 0 Parameter = Standard = Cr 50 TOXICANT ANALYSIS Parameter = Cu pg/I Standard = n BDL=1/2DLctual Data RESULTS 1/00 1 2 3 4 5 6 ugA 7 ug/I 8 9 10 ugA 11 ugll 12 13 14 ugA 15 ugA 16 4/00 17 18 ugA 19 ugA 20 21 22 ugA 23 ugA 24 25 26 ug/I 27 ug/I 28 29 30 ug/I 31 ug/I 32 33 34 ug/I 35 ug/I 36 37 38 ug/I 39 ug/I 40 41 42 ug/I 43 ug/I 44 45 46 ug/I 47 ug/I 48 49 50 ug/I 51 ug/I 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 7 Poll niDL=1/2Dl;tual Data RESULTS 1 <2 Std Dev. 0.668077603 1/00 1 25 25 Std Dev. 153.729 1 <2 Mean 1.166666667 2 29 29 Mean 84.9167 1 <2 C.V. 0.572637945 3 500 500 C.V. 1.81035 1 <2 4 290 290 1 <2 5 780 780 1 <2 Mull Facto 1.5 6 180 180 Mult Factor] 4 2 <4 Max. Value 5 pg/1 7 200 200 Max. Value 780 pg/I: 5 5 Max. Pred . 7.5 pg/1 8 160 160 Max. Pred ( 3120 pg/f 1 <2 Allowable C 1089.43 pg/1 4/00 9 140 140 Allowable C 152.52 pg/E 1 <2 10 22 22 1 <2 11 21 21 1 <2 12 27 27 2 <4 13 35 35 1 <2 14 27 27 1 <2 15 19 19 1 <2 16 9 9 1 <2 17 14 14 1 <2 18 30 30 1 <2 19 17 17 1 <2 20 52 52 1 <2 21 16 16 1 <2 22 19 19 1 <2 23 36 36 1 <2 24 41 41 2 2 25 20 20 4 4 26 28 28 1 <2 27 20 20 1 <2 28 21 21 1 <2 29 19 19 1 <2 30 21 21 1 <2 31 42 42 1 <2 32 25 25 1 <2 33 20 20 1 <2 34 42 42 1 <2 35 54 54 1 <2 36 56 56 1 <2 37 1 <2 38 1 <2 39 1 <2 40 1 <2 41 1 <2 42 1 <2 43 1 <2 44 1 <2 45 1 <2 46 1 <2 47 1 <2 48 1 <2 49 1 <2 50 1 <2 51 1 <2 52 1 <2 53 1 <2 54 I <2 55 1 <2 56 I <2 57 I <2 58 1 <2 59 1<2 60 Parameter = Standard = 61 62 63 64 65 66 67 68 69 70 8/17/00 Pb tiarameter= Ni pg/l Standard = 25 3DL=1/2Dhctual Dat RESULTS 1 <2 Std Dev. 50.848 1 <2 2.9 200 52 4.6 76 8.5 360 27 17 21 11 15 11 12 '6_ =6 6 6 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 1<2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 9 9 5 5 1 <2 1 <2 1 <2 5 5 4 4 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 2 2 14 14 1 <2 1 <2 1 <2 2 2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 Mean 13.848 2.9 C.V. 3.6718 200 52 4.6 Mutt Facto 3.81 76 Max. Value 360 8.5 Max. Pred ( 1368 pg/1 360 Allowable C 544.71 pg/1 27 17 21 11 15 11 12 88 :: i?arameter = Ag i arameter = PO i Standard = I 0.061/rg/I !:Standard = • n BDL=1/2DUctual Dat RESULTS n 3DL=1/2Dllctual Data RESULTS n 1 2.6 2.6 Std Dev. 1.27525 1 1 <2 Std Dev. 0.4665 1 2 2 2 Mean 2.59063 2 1 <2 Mean 1.1579 2 3 3.5 3.5 C.V. 0.49226 3 1 <2 C.V. 0.4029 3 4 1<2 4 1<2 4 5 3.6 3.6 5 1 <2 5 6 3.7 3.7 Mult Factor' 1.51 6 1 <2 Mutt Facto 1.51 6 7 4.1 4.1 Max. Value 6.8 pg/ii 7 1 <2 Max. Value 2.5 pgAiii 7 8 6.8 6.8 Max. Pred ( 10.2 pg4iii 8 1 <2 Max. Pred 1 3.75 pg/E ; 8 9 5.3 5.3 Allowable C 1917.39 pg/M 9 1 <2 Allowable( 1.31 irg/i:l 9 10 6.6 6.6 10 1 <2 10 11 4 4 11 1 <2 11 12 3 3 12 1 <2 12 13 4 4 13 1 <2 13 14 2 2 14 1 <2 14 15 4 4 15 1 <2 15 16 2 2 16 1 <2 16 17 3 3 17 1 <2 17 18 1 <2 18 1 <2 18 19 1 <2 19 1 <2 19 20 2 2 20 1 <2 20 21 3.2 3.2 21 1 <2 21 22 3 3 22 1 <2 22 23 3 3 23 1 <2 23 24 2 2 24 1 <2 24 25 1 <2 25 1 <2 25 26 1 <2 26 1 <2 26 27 2.7 2.7 27 1 <2 27 28 2 2 28 1 <2 28 29 4 4 29 2.5 <5 29 30 3 3 30 2.5 <5 30 31 1 <2 31 2.5 <5 31 32 2 2 32 2.5 5 32 33 2 2 33 1 <2 33 34 2 2 34 1 <2 34 35 2.2 2.2 35 1 <2 35 36 1 <2 36 1 <2 36 37 1 <2 37 1 <2 37 38 6 6 38 1 <2 38 39 3 3 39 39 40 1 <2 40 40 41 2 2 41 41 42 2 2 42 42 43 2 2 43 43 44 3 3 44 44 45 1 <2 45 45 46 1 <2 46 46 47 1 <2 47 47 48 2.5 <5 48 48 49 2.5 <5 49 49 50 2.5 <5 50 50 51 2.5 <5 51 51 52 2.5 <5 52 52 53 2.5 <5 53 53 54 2.5 <5 54 54 55 2.5 <5 55 55 56 2.5 <5 56 56 57 2.5 <5 57 57 58 2.5 <5 58 58 59 2.5 <5 59 59 60 2.5 <5 60 60 61 2.5 <5 61 61 62 2.5 <5 62 62 63 2.5 <5 63 63 64 2.5 <5 64 64 65 65 65 66 66 66 67 67 67 68 68 68 69 69 69 70 70 70 TOXICANT ANALYSIS 8/17/00 Zn 50 l41n Parameter = Hg Parameter = As atandard=1 0.012Ipgn TOXICANT ANALYSIS Standard= 50 Parameter = $$, tandard = 3DL=1/2DIActual Data RESULTS n3DL=1/2Drlctual Data RESULTS 75 75 Std Dev. 60.734 1 0.1 <0.2 Std Dev. 120 120 Mean 94.029 2 0.1 <0.2 Mean 85 85 C.V. 0.6459 3 0.1 <0.2 C.V. 220 220 4 0.1 <0.2 180 180 5 0.1 <0.2 230 230 Mutt Factor) 1.91 ? 6 0.1 <0.2 250 250 Max. Value 250 pg/l 7 0.1 <0.2 220 220 Max. Pred t 475 pglii 8 0.1 <0,2 170 170 Allowable C ###### pgI) 9 0.1 <0.2 44 44 10 0.1 <0.2 71 71 11 0.1 <0.2 64 64 12 0.1 <0.2 80 80 13 0.1 <0.2 98 98 14 0.1 <0.2 69 69 15 0.1 <0.2 44 44 16 0.1<0,2. 63 63 17 0.1 <0.2 46 46 18 0.1 <0.2 32 32 19 0.1 <0.2 16 16 20 0.1 <0.2 69 69 21 0.1 <0.2 50 50 22 0.1 <0.2 62 62 23 0.1 <0.2 140 140 24 0.1 <0.2 56 56 25 0.1 <0.2 82 82 26 0.1 <0.2 71 71 27 0.1 <0.2 67 67 28 0.1 <0.2 65 65 29 0.1 <0.2 56 56 30 0.1 <0.2 66 66 31 0.1 <0.2 83 83 32 0.1 <0.2 81 81 33 0.1 <0.2 72 72 34 0.1 <0.2 35 0.1 <0.2 36 0.1 <0.2 37 0.1 <0.2 38 0.1 <0.2 39 0.1 <0.2 40 0.1 <0.2 41 0.1 <0.2 42 0.1 <0.2 43 0.1 <0.2 44 0.1 <0.2 45 0.1 <0.2 46 0.1 <0.2 47 0.1 <0.2 48 0.1 <0.2 49 0.1 <0.2 50 0.1 <0.2 51 0.1 <0.2 52 0.1 <0.2 53 0.1 <0.2 54 0.1 <0.2 55 0.1 <0.2 56 0.1 <0.2 57 0.1 <0.2 58 0.1 <0.2 59 0.1 <0.2 60 0.1 <0.2 61 0.1 <0.2 62 0.1 <0.2 63 0.1 <0.2 64 0.1 <0.2 65 0.1 <0.2 66 0.1 <0.2 67 0.1 <0.2 68 69 70 • • 5.7E-09 0.1 5.7E-08 Mult Factor) 11 Max. Value 0.1 pgfl Max. Pred r 0.1 pg/I? Allowable C 0.26 pg/I n BDL=1/2DLkctual Data RESULTS 1 <2 Std Dev. 1 <2 Mean 1 <2 C.V. 4 4 1 <2 1<2 1 <2 1 <2 1 <2 1 <2 1<2 1 <2 1 <2 1<2 1<2 1 <2 1 <2 1<2 1 <2 1<2 1 <2 1 <2 1 <2 1 <2 1 <2 1<2 5.3 5.3 1 <2 1<2 1 <2 1 <2 2 2 2 2 2 2 3.3 3.3 5 5 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 2 2 2 2 1 <2 1 <2 1 <2 3 3 1 <2 1 <2 1 <2 2.4 2.4 1 <2 1 <2 1 <2 2 2 3 3 1 <2 1<2 2 2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 1 <2 0.9126 1.3824 0.6602 Mutt Facto>I 1.61 Max. Value 5.3 pg4ii Max. Pred ( 8.48 pg/f':, Allowable C 1089.43 n 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 8/17/00 • Cn TOXICANT ANALYSIS Spgn 3DL-1/2DRctual Data RESULTS 1 <2 Std Dev. 2.5034 2 2 Mean 4.1147 5.6 5.6 C.V. 0.6084 4 4 6 6 5.4 5.4 Mutt Factor 1.61 5.4 5.4 Max. Value 10 pg/1 1 <2 Max. Pred I 16 pgli 7 7 Allowable C 108.94 pgll 3.1 3.1 3.4 3.4 1 <2 1 <2 1 <2 1 <2 1 <2 yam_ 3.1 3.1 3.1 3.1 3.8 3.8 4.7 4.7 1 <2 5 5 s 6 2 2 2 2 4 4 4 4 1 <2 1 <2 4 4 5 5 6.8 6.8 1 <2 5 <10 5 5 1 <2 5 5 10 10 8 8 9 9 5 5 5.3 5.3 8 8 7 7 4 4 3 3 9.9 9.9 8 8 2 2 2 2 2 2 2.1 2.1 2 2 2 2 7 7 6 6 7 7 2 2 2.4 2.4 4 4 4 4 6 6 5 5 9.7 9.7 5 5 6 6 3 3 8/17/00 TOXICANT ANALYSIS Facility Name Oakboro WWTP i NPDES # nc0043532 Qw (MGD) 0.9 7Q10s (cfs) 29 1WC (%) 4.59 'c'ving Stream Rocky River Stream Class C FINAL RESULTS Cr Max. Pred Cw 7.5 ug/ Allowable Cw 1089.4 ug/ Max. Value 5 Cu Max. Pred Cw 3120 ug/ Allowable Cw 152.5 ug/ Max. Value 780 Pb Max. Pred Cw 1368 ug/ Allowable Cw 544.7 ug/ Max. Value 360 Ni Max. Pred Cw 10.2 ug/ Allowable Cw 1917.4 ug/ Max. Value 6.8 Ag Max. Pred Cw 3.75 ug/ Allowable Cw 1.3 ug/ Max. Value 2.5 Zn Max. Pred Cw 475 ug/ Allowable Cw 1089.4 ug/ Max. Value 250 Hg Max. Pred Cw 0.1 ug/ Allowable Cw 0.3 ug/ Max. Value 0.1 As Max. Pred Cw 8.48 ug/ Allowable Cw _ 1089.4 ug/ Max. Value _ 5.3 Cn Max. Pred Cw 16 ug/ Allowable Cw 108.9 ug/ Max. Value 10 8/17/00 TOXICANT ANALYSIS Facility Name Oakboro WWTP NPDES # nc0043532 Qw (MGD) 0.9 7010s (cfs) 3.3 !WC (%) 29.71 c'ving Stream Long Creek Stream Class C FINAL RESULTS Cr Max. Pred Cw 7.5 ug/ Allowable Cw 168.3 ug/ Max. Value 5 Cu Max. Pred Cw 3120 ug/ ug/ Allowable Cw 23.6 Max. Value 780 Pb Max. Pred Cw 1368 ug/ Allowable Cw 84.1 ug/ Max. Value 360 Ni Max. Pred Cw 10.2 ug/ Allowable Cw 296.2 ug/ Max. Value 6.8 Ag Max. Pred Cw 3.75 ug/ Allowable Cw 0.2 ug/ Max. Value 2.5 Zn Max. Pred Cw 475 ug/ Allowable Cw 168.3 ug/ Max. Value 250 Hg Max. Pred Cw 0.1 ug/ ug/ Allowable Cw 0.0 Max. Value 0.1 As Max. Pred Cw 8.48 ug/ Allowable Cw 168.3 ug/ Max. Value 5.3 Cn Max. Pred Cw 16 ug/ ug/ Allowable Cw 16.8 Max. Value 10 8/17/00 TOXICANT ANALYSIS Facility Name Oakboro WWTP i NPDES # nc0043532 Ow (MGD) 0.5 7010s (cfs) 3.3 /WC (%) 19.02 c'ving Stream Long Creek Stream Class C FINAL RESULTS Cr Max. Pred Cw 7.5 ug/ Allowable Cw 262.9 ug/ Max. Value 5 Cu -} Max. Pred Cw 3120 ug/ Allowable Cw ,, 36.8 ug/ Max. Value ' 780 Pb Max. Pred Cw 1368 ug/ Allowable Cw 131.5 ug/ Max. Value IF 360 a Ni Max. Pred Cw 10.2 ug/ Allowable Cw 462.7 ug/ Max. Value 6.8 Ag of Max. Pred Cw 3.75 ug/ ug/ Allowable taw 0.3 Max. Value 0 2.5 4 Zn. Max. Pred Cw s 475 Lig/ Allowable Cw $ 262.9 rug/ Max. Value 250 Hg Max. Pred Cw 0.1 ug/ ug/ Allowable Cw 0.1 Max. Value 0.1 As Max. Pred Cw 8.48 ug/ Allowable Cw 262.9 ug/ Max. Value 5.3 Cn Max. Pred Cw 16 ug/ Allowable Cw 26.3 ug/ Max. Value 10 8/17/00 144 LtIA' 1-kortfr4 vor Whole Effluent Toxicity Testing Self -Monitoring Summary July 17, 2000 IA(:ILI11' REQUIREMENT YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Newton WWTP Prnn chr lim: 56%; upon cap 7. MGD chr lim 66% Y 1996 - - Pass - - Pass - - Pass - - Pass NC0036196/001 Begin:ll/I/1995 Frequency: Q P/F + Mar Jun Sep Dec NonComp:Single 1997 - - Pass - - Pass - - Pass - - Pass County: Catawba Region: MRO Subbasin: CTB35 1998 - - Pass - - Pass - - Pass - - Pass PF: 5.0 Special 1999 - - Pass - - Pass - - Pass - - Pass 7Q10: 6.0 IWC(%)3632 Order: 2000 - -- Pass - - Norfolk And Western Railway Co. PERM: 24HR LC50 AC MONIT EPIS FTHD (GRAB) 1996 - -- - - - - - - - - NR NC0046931/001 Begin:9/1/1993 Frequency: 50WD/A NonComp: 1997 - -- - - >100 - - - - - - - County: Forsyth Region: WSRO Subbasin: YADO4 1998 - - - - >100 PF: VAR special 1999 - - - - - >100 7Q10: 0 IWC(%):100 Order; 2000 - - - Norfolk Southern Railway Co. Penn chr lim: 29% NC0029246/011 Bcgin:3/1/2000 Frequency: Q Mar Jun Scp Dcc County: Davidson Region: WSRO Subbasin: YADO4 PF: 0.317 Special 7Q10: 1.2 IWC(%)29.0 Order: + NonComp:Singlc Y 1996 •- - Fail NRIPass - Pass - - Pass - - Pass 1997 - - Pass - - Pass - - Pass - Pass 1998 - - Pass - - Pass - - Pass -- - Pass 1999 - - NRIPass - - Fail Pass - Pass - - Fail 2000 Pass - Pass - - North Wilkesboro W WTP Penn chr lim: 1.5•/. NC0020761/001 Begin:5/1/1999 Frequency: Q P/F + Jan Apr Jul Oct County. Wilkes Region: WSRO Subbasin: YADO1 PF: 2.0 Special 7Q10: 196.0 I W C(%):I.5 Order: + NonComp:Singlc 1998 >100 - - >t0o - - >100 1997 >100 - - NR/>100 - - >100 1998 >100 - - BI - - Pass 1999 Pass - - Pass - - NRIPass 2000 Pass - - Pass >100 >100 Pass Pass Norwood W WTP Perm chr lim: 2.7% Y 1996 - - Pass NC0021628/001 Begin:6/12000 Frequency: Q Mar Jun Sep Dec + NonComp:Singlc 1997 - - Pass County. Sternly Region: MRO Subbasin: YADI3 1998 - - Pass PF: 0.75 Special 1999 - - Pass 7Q10: 42.0 IWC('/.)2.68 Order: 2000 - - Pass Pass - - Pass - - Pass Pass - Pass - - Pass Pass -- - Pass - - Pass 01 - - Pass - - Pass Oakboro W WTP PERM CFIR LIM: 19%. 2.6% @ REL TO ROCKY R. Y 1996 Pass - - Pass -- NC0043532/001 Begin: I/1/1995 Frequency: Q P/F + Jan Apr Jul Oct NonComp:SINGLE 1997 NRIPass - - Fail Pass County: Sternly Region: MRO Subbasin: YADI3 1998 Pass - - Fail Fail PF: 0.50 Special 1999 Pass - - Pass - 7Q10: 3.3 IWC(%):19 Order: 2000 Fall >76 >76 Pass Pass Fail Pass Pass Pass r,,4 Fadlate Pass Pass Pass Fail Pass Fail Pass Occidental Chemical Corp/001 Penn chr Iim: 4.6% Y 1996 - >12(s) - - >12 NC0003875/001 Begin:11/1/1996 Frequency: Q P/F + Feb May Aug Nov NonComp:Single 1997 - >12 - - 6.1(s) County: Ncw Hanover Region: WIRO Subbasin: CPF23 1998 - >12(s) - - 8.06(s) PF: 0.785 Special 1999 - 6.1 - - 9.7(s) 7Q10: 25 IWC(%):4.6 Order: 2000 - 9.8 - - Pend(s) >12(s) - - >12 6.0(s) - - >12(s) >12(s) - - >12(s) >12(s) - - >12 Ocracoke Sanitary District Penn 24hr p/f ac monit: 90% mysid 1996 - - - - NC0041530/001 Bcgin:8/1/1999 Frequency: Q P/F Feb May Aug Nov + NonComp: 1997 - - - - County. Hyde Region: WARO Subbasin: PAS55 1998 - - - - - PF: 0.45 Special 1999 - - - - - 7Q10: NA IWC(%):NA Order: 2000 - Pass - - Pass (31 Old Fort W WTP PERM CHR LIM: 22%; IF PF 1.2 PERM CHR LIM 28% Y 1996 - - Pass - - Pass - -- NRiPo5s - Pass Pass NC0021229/001 Begin:6/1/1995 Frequency: Q P/F + Mar Jun Sep Dee NonComp:SINGLE 1997 - - Pass - - Pass - - Fail Pass - Pass County: McDowell Region: ARO Subbasin: CTB30 1998 - - Pass - - Pass - - Pass - - Pass PF: 0.80 Special 1999 - - Pass - - Pass - -- Pass - - Pass 7Q10: 4.40 IWC(%):21.96 Order: 2000 - - Pass - - Omni Supply Inc. Penn clu lim: 8.0% NC0006254/001 Begin:11/1/1998 Frequency: Q P/F + Mar Jun Sep Dec County: Caldwell Region: ARO Subbasin: YADOI PF: 0.45 Special 7Q 10: 8.00 I W C(%)d).02 Order: + NonComp:Singlc 1996 -- - Pass - - Pass - Pass - - Pass 1997 - - Pass - - Pass - - Pass - - Pass 1998 - - Pass - - Pass - - Pass - - Pass 1999 - - Pass - - Pass - - Pass - - Pass 2000 - - Pass - - OWASA/Mason Farm Penn chr lim: 90'/. Y 1996 - Faigs)t - - Pass(s) - - Pass(s) - - Pass NC0025241/001 Begin:4/1/1996 Frequency: Q P/F + Feb May Aug Nov NonComp:Single 1997 -- Pass - - Pass(s) - - Pass(5) - - Pass(s) County: Orange Region: RRO Subbasin: CPF06 1998 •- Pass - - Pass - - Pass - - Pass(s) PF: 10.0 Special 1999 - Pass(s) - - Pass(s) - - Fal(s) 97.46 - Pass(s) 7Q10: 1.1 IWC(%)92.54 Onkr: 2000 •- Pass(s) - - Pass(s) Y Pre 1996 Data Available LEGEND: PERM = Permit Requirement LET = Administrative Letter - Target Frequency - Monitoring frequency: Q- Quarterly; M- Monthly; BM- Bimonthly; SA- Semiannually; A- Annually; OWD- Only when discharging; D- Discontinued monitoring requirement Begin = First month required 7010 = Receiving stream low flow criterion (cfs) + - quarterly monitoring increases to monthly upon failure or NR Months that testing must occur - ex. Jan, Apr. Jul. Oct NonComp = Current Compliance Requirement PF = Pcrmined flow (MGD) IWC/. = lnstrcam waste concentration P/F - Pass/Fail test AC = Acute CHR = Chronic Data Notation: f- Fathead Minnow; • - Ceriodaphnia sp.; my - Mysid shrimp; ChV - Chronic value; P • Mortality of stated percentage at highest concentration; at - Performed by DWQ Aquatic Ton Unit; bt - Bad test Reporting Notation: -- = Data not required; NR - Not reported Facility Activity Status:1 - Inactive, N • Newly Issucd(To construct); H - Active but not discharging; t-More data available for month in question; • = ORC signature needed 34 ri Terrain Navigator - Fayetteville/Charlotte/Sendhllls [NC) - [CHARLOTTE] -1' File Vie., GoTo Markers Routes Tracks Bookmark Zoom Ej Start K] GPS Window Help 24,100 14 12 11 X' 0 2'1 rF-!I35.2500422° Pr 80.2705 Click to place a Marker; Click over a marker to select; Click over marker text to edit [Shift: Zoom (Jul] [Ctrl: Drag Tool] [Shift+Ctrl: Cer "Gale, Susan" Tue 081291...I Inbox - Netscape Folder I i4 Exploring - Station database I PR Yadkin/Pee Dee River Ba.. {{i Terrain N, Data request Subject: Data request Date: Tue, 29 Aug 2000 10:45:34 -0400 From: Susan Gale <susan.gale@ncmail.net> Organization: NC DENR DWQ To: Jackie.Nowell @ncmail.net I've attached a Word file that shows a map of the area around Oakboro, showing the two stations on Long Creek. Please confirm that these are the stations that you are interested in. If not, please refer to the station list at http://www.esb.enr.state.nc.us/Coalitions/ypdrba.htm and let me know the correct stations. I'll be forwarding your request to Phil Bethea when I get the required information, instead of Zi-Qiang Chen (the Coalition Coordinator) as I had indicated on the phone earlier. If you have any more questions, feel free to contact me or Phil. Thanks Susan Ploakboro.doc Name: oakboro.doc Type: Microsoft Word Document (application/msword) Encoding: base64 Download Status: Not downloaded with message Susan Gale <susan.gale@ncmail.net> Environmental Technician NC Department of Water Quality Ecosystems Unit 1 of 1 8/29/00 11:03 AM tv1.0,1,,(Aec,( fro 9i(v 00 tigc . _ Tc 3 cL-Qk e 43-9/oo Prd ot a „I �.,co� �� VUf J&to Jo A . q g 7 s� e�'e,-�� G GV`^.ul ST1P 10481)2- (A) coTP (0-0, Ksi-AdO geiBE3a. slyyt. Pstzgz- Lilo/ 5) o1Li Flo 1 luArxiA.4s Co►,��e�-�090c,) o� Vow , A3) C6L) C) , CAI {)v I Lu �5 arm S (�,l ("j " .Q�.�� a-t, CN. @IN -14--4}3 GdAif, rv•-cy4=6A Dr5-1 Curt- P " &jacPF2. s--03 "'U boro WWTP Removal Rates sed on quarterly data for 1998 Parameter Mercury Aresenic in (mgll) out (mg/I) %R EPA 8th % EPA median LT 0.002 LT 0.002 0 79 60 LT 0.002 LT 0.002 0 LT 0,002 LT 0.002 0 LT 0.002 LT 0.002 0 LT 0.002 LT 0.002 0 53 53 LT 0.002 LT 0.002 0 LT 0.002 LT 0.002 0 LT 0.002 LT 0.002 0 I Cadmium LT 0.001 LT 0.001 0 91 67 BOD TSS NH3 TKN LT 0.001 LT 0.001 0 LT 0.001 LT 0.001 0 LT 0.001 LT 0.001 0 113 13.4 0.8814 115 3.7 0.9678 128 6.32 0.9506 O`lii- 106 5.4 0.9491 0,937231 40 2.3 0.9425 141 7.6 0.9461 93 8.3 0.9108 0 j1-- 132 7.9 0.9402 0.934876 4 2.81 0.2975 12.6 1.85 0.8532 7 1.35 0.8071 4 0.95 0.7625 0.680079 2.(-, H=1o),(i 6.7 6 0.1045 16 4.6 0.7125 16 6 0.625 11 3.5 0.6818 0 *L 0.673106 1998 NH3 ave. effluent value apr 1.12 may 0.58 jun 0.55 jul 2.02 aug 1.19 sep 1.51 oct 0.82 1.1129 nov 1.13 dec 1.39 jan 4.43 feb 3.59 mar 3.94 2.896 oakremoval.xls 2/16/99 i ti kboro WWTP Removal Rates ased on quarterly data for 1998 Parameter in Chromium coLk a Copper (VI) out (mg/I) %R EPA 8th % EPA median LT 0.002 LT 0.002 0 91 82 LT 0.002 LT 0.002 0 0.005 LT 0.002 0.6 LT 0.002 LT 0.002 0 0.033 0.07 0.086 0.059 Lead 0.002 LT 0.002 LT 0.002 LT 0.002 Nickel Silver Zinc ave zn 21-Jan 22-Jan 23-Jan 0.04-0.2121 95 0.019 0.7286 0.059 0.314 0.057 0.0339 0.002 0 76 LT 0.002 0 LT 0.002 0 LT 0.002 0 LT 0.005 LT 0.005 LT 0.005 LT 0.005 LT 0.005 LT 0.005 LT 0.005 LT 0.005 LT 0.002 LT 0.002 LT 0.002 LT 0.002 LT 0.002 LT 0.002 LT 0.002 LT 0.002 0.054 0.074 0.084 0.067 0.072 0.048 0.032 0.0615714 86 61 0 62 • 42 0 0 0 0 88 0 0 0 0.061 -0.1296 88 0.035 0.527 0.042 0.5 0.1-0.4925 0.03 0.5833 0.03 0.375 0.03 0.0625 75 79 - , °LI `l -1 t)C.)s oakremoval.xls 2/16/99 70Wfl oi OaUoro P.O. Box 610 Oakboro, North Carolina 28129 Telephone 704-485-3351 Fax 704-485-2439 May 6, 1999 NCDENR Attn: Charles H. Weaver P.O. Box 29535 Raleigh, NC 27626-0535 RE: Town of Oakboro Permit # NC 0043532 Stanly County Dear Mr. Weaver, This letter is to request "renewal of permit" for subject Wastewater Treatment Plant. The following is an update of changes at the WWTP: 1) On August 3, 1998, we received a NPDES Permit Issuance which states the changes to our pervious permit (Copy enclosed). 2) We received "authorization to construct" on December 2, 1998 (Copy Attached). 3) Project was awarded April 13, 1999 and "Notice to Proceed" April 19, 1999 4) On February 6, 1998, we received "Authorization to Construct" for the relocation of effluent discharge to Rocky River in the Yadkin - Pee Dee River Basin 5) Project is approximately 75% complete at this time. If you have any questions regarding this matter, please contact me at 704.485.4613 or 704.485.8322 Sincerely, Itr, ydze_e_ Joyce H. Little Mayor The Town of Oakboro currently operates a bio-solids land application program as permitted by the State of North Carolina Division of Environmental Management under permit number WQ0005387 to expire July 31, 2001. The Town of Oakboro currently removes liquid waste bio-solids from their 250,000 gallon aeration basin and applies the sludge to a 37.5 acre site that is specified in above mentioned permit. This basin stabilizes the bio-solids through aerobic digestion, such that the bio-solids meet all requirements for land application outlined by the Division of Environmental Management. The estimated volume of bio-solids to be land applied is 36.31 dry tons per year. The site approved for land application contains 37.5 acres of land, excluding buffer areas. The permit has been in place since August 26, 1996. The Town of Oakboro is proceeding with an expansion to the wastewater treatment facility, and it is the intention to evaluate the need for additional land application site for bio-solids. If additional sites are required, or if other sludge management practices will need to be considered, these alternatives can be evaluated during the design process. The plant expansion has been based on speculative limits, and will affect the amount of bio-solids produced at the plant, no reliable estimates of bio- solids production from the expanded plant can be made at this time.