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HomeMy WebLinkAboutNC0026573_Draft Permit_20220613ROY COOPER Governor ELIZABETH S. BISER Secretary RICHARD E. ROGERS, JR. Director NORTH CAROLINA Environmental Quality June 14, 2022 City of Morganton Attn: Eli Self, Superintendent and ORC P.O. Box 3448 Morganton, NC 28680 Transmitted via email to eself@ci.morganton.nc.us Subject: 2nd Draft NPDES Permit Renewal Permit NC0026573 Catawba River Pollution Control Facility Burke County Facility Grade IV (8.0, 10.5, and 13.0 MGD) SIC Code 4952 Dear Permittee: Enclosed with this letter is a copy of the 2' Draft NPDES permit renewal for the Catawba River Pollution Control Facility (Facility). Please review this draft carefully to ensure a thorough understanding of the requirements and conditions it contains. There are changes from the draft permit sent to you on October 26, 2021, considering additional information you provided on November 29, 2021, including the following: • The permit expiration date was modified to February 26, 2027. Accordingly, the specified years for the Effluent Pollutant Scans have been adjusted (2024, 2025, 2026). See Special Condition A. (6.). • The Supplement to Permit Cover Sheet (Cover Sheet), item 1, was updated to list the current wastewater treatment flow capacity, 8.0 MGD, based on information provided by the Facility in the 2022 permit renewal process. • The authorization language in the Cover Sheet and Special Condition A. (1.) and A. (2.) was updated to modify the requirements before the Facility is authorized to transition from the 8.0 MGD flow tier into the 10.5 MGD flow tier. This change was made to require an upgrade of the Facility to meet the final limits for the 10.5 MGD effluent limitation page. Please be aware that 15A NCAC 02T. 0118 addresses actions related to the WWTP capacity based on the permitted hydraulic flow. • Based on our review of the nutrient information, the proposed nutrients limits (Total Nitrogen (TN) and Total Phosphorous (TP)) have been removed from the 10.5 MGD flow tier limitation page; as well as monitoring requirements for Total Kjeldahl Nitrogen and Nitrite and Nitrate. TN and TP annual load monitoring requirements for 10.5 MGD are added. [See Special Condition A. (2.).] The limits for the 13.0 MGD flow tier page have been maintained at your request with the same limits that was originally public noticed. The 13.0 MGD flow tier may not be used for an extended period of time from your information, it is not appropriate to change the existing 13.0 MGD limits. When the original NPDES permit was issued a review of the 13.0 MGD flow tier was conducted and approved, so this flow tier will be maintained. • The monitoring frequency for copper was corrected from quarterly to monthly. See Special Condition A. (1.), A. (2.), and A. (3.). • The draft weekly average limit for BOD5 for the 10.5 MGD flow tier was corrected from 45.0 to 27.8 mg/1, as was set in the previous permit for this flow tier. • The reasonable potential analysis (RPA) was corrected to change the outstanding resource water (ORW) stream classification in the original draft with the correct classification as WS-IV and CA. This correction updates the calculated water quality standard (WQS) values and the RPA results: o The limit for copper was updated for all flow tiers. See Special Condition A. (1.), A. (2.), and A. (3.). Special Condition A. (9.) was updated to include a notation for the Permittee with the option to request the removal of the Copper Schedule of Compliance. o The monitoring requirement for zinc for 10.5 and 13.0 MGD was removed. See Special Condition A. (2.), and A. (3.). o The monitoring requirement for selenium for 13.0 MGD was removed. See Special Condition A. (3.). • Based on the categories of significant industrial users (SIUs) discharges, there is a need to assess PFAS compounds. Special Condition A. (10.) to monitor effluent PFAS chemicals 2/year has been added to the permit, to be effective six (6) months after EPA has a final wastewater method in 40 CFR 136 published in the Federal Register. • Special Condition A. (6.) was also updated to include language about the additional toxicity sampling. Samples must represent seasonal variation. The 2' draft permit maintains the following significant changes identified in the letter sent on October 26, 2021: • Facility components listed on the Supplement to Permit Cover Sheet were adjusted according to the flow process diagram provided with the permit application renewal. • Parameter codes and Facility's Grade were included in the Effluent Limitations and Monitoring Requirements tables. [See Sections A. (1.), A. (2.), and A. (3.)]. • The outfall coordinates were updated throughout the permit according to the locations provided by the Permittee in the permit application renewal process. • For consistency with the use of the current 7Q10, this renewal uses the most recent summer 7Q10 of 118 cfs for the limit pages for 8.0 MGD, 10.5 MGD, and 13.0 MGD. • The results of instream waste concentration (IWC)-based calculations for ammonia -nitrogen, ammonia nitrogen limits have been changed to reflect appropriate limits for the 8.0 MGD flow tier [See A. (1.)]. • The Division is implementing dissolved metals standards in all permits, per the 2016 revisions to State water quality standards. As such, the NPDES Permitting Unit will need site -specific effluent hardness data and instream hardness data upstream of the discharge for each Facility monitoring these metals to calculate permit limitations. Effluent hardness and instream hardness sampling upstream of the discharge, have been added to the permit at a monitoring frequency of quarterly. [See Sections A. (1.), A. (2.), and A. (3.)]. • Based on the reasonable potential analysis (RPA) predicting a maximum effluent copper concentration that is greater than the allowable discharge concentration based on state water quality standards, limit and monthly monitoring for copper has been added to the permit [See Sections A. (1.), A. (2.), and A. (3•)]. To provide an opportunity for the City to develop a plan to assess sources of copper to come in compliance with the limit in Section A. (1.), a 3-year schedule of compliance has been added to the permit [See Special Condition A. (9.) Schedule of Compliance for Copper Limitations]. • Based on the RPA predicting a maximum effluent concentration that is greater than the allowable discharge concentration based on state water quality standards, quarterly monitoring for antimony and silver have been added to the permit for 8.0 MGD, 10.5 MGD, and 13.0 MGD [See Sections A. (1.), A. (2.), and A. (3.)]. • The City of Morganton reported total silver at less than detection, with detection levels of < 1.0 µg/L, < 2.5 µg/L, and < 6.0 µg/L, in the Effluent Pollutant Scans (EPS) and discharge monitoring reports (DMRs). Based on the RPA, the City's calculated total silver allowable discharge concentration for 8.0 MGD is 0.63 µg/L. The DWR's laboratory identifies the target Practical Quantification Limit (PQL) for silver as 1.0 µg/L. 15A NCAC 2B .0505 (e) (4) requires that all test procedures must produce detection and reporting levels that are below the permit discharge requirements, and all data generated must be reported to the approved detection level or lower reporting level of the procedure. The method with the lowest detection level must be used unless there is a documented matrix interference. Page 2 of 3 • In order for the Permittee to calculate the total nitrogen (TN) and total phosphorous (TP) loads, the total monthly flow (TMF) of wastewater discharged during the month is needed; therefore, monitoring and reporting for TMF has been added for 13.0 MGD. [See Sections A. (2.), and A. (3.)]. • Based on the need to assess aluminum in the RPA and calculate a specific water quality standard for aluminum, quarterly monitoring for aluminum and dissolved organic carbon has been added to the permit [See Sections A. (1.), A. (2.), and A. (3.)]. • Language has been added to require the submittal of discharge monitoring reports electronically using NC DWR's eDMR application system [See Sections A. (1.), A. (2.), and A. (3.) Footnote 1]. • Language has been added to update information about upstream and downstream sampling locations according to the locations provided by the Permittee in the permit application renewal process. [See Sections A. (1.), A. (2.), and A. (3.) Footnote 2]. • Language has been added to include information on monitoring coalition programs. [See Sections A. (1.), A. (2.), and A. (3.) Footnote 8]. • A notation was made concerning the Electronic Reporting Rule — NPDES Electronic Reporting Rule — Phase 2 Extension. EPA extended the Phase 2 deadline to December 21, 2025. [See Special Condition A. (7.)]. • Federal regulations require the electronic submittal of all discharge monitoring reports (DMRs) and program reports. The requirement to continue reporting discharge monitoring data electronically using the NC DWR's Electronic Discharge Monitoring Report (eDMR) internet application has been added to your NPDES permit [See Special Condition A. (7.)]. The NPDES standard conditions (Parts II, III, and IV), are the same as in your current permit except that agency and division names have been updated. The latest version is available at https://bit.ly/3k5NFaL and can be viewed online or downloaded as a PDF file. Concurrent with this notification, the Division is publishing a notice in a newspaper having circulation in the general Burke County area, soliciting public comments on this draft permit. Please provide any written comments you may have to the following: NCDEQ/DWR, NPDES Permitting Branch, 1617 Mail Service Center, Raleigh, NC 27699-1617 no later than 30 days after receipt of this draft permit. Following the 30-day public comment period, the Division will review all pertinent comments and take appropriate action prior to issuing a final permit. If you have questions concerning this draft permit, please contact me at (919) 707-9130 or by email at diana.yitbarek@ncdenr.gov. Sincerely, Diana Yit arek, Engineer NPDES Municipal Permitting Unit Hardcopy: NPDES Files Ecopy: US EPA Region 4 City of Morganton/ Sandy Sally W Catawba RPCF Pretreatment/ Tim Arney DWR/Asheville Regional Office/ Water Quality/ Stephanie Williams and Tim Heim DWR/Municipal Permitting Unit/ Keyes McGee DWR/Aquatic Toxicology Branch/ Zach Thomas and Cindy Moore DWR/Public Water Supply/ Kimberly Barnett and Nicole Hairston DWR/Operator Certification Program/ Maureen Kinney Page 3 of 3 Permit NC0026573 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF WATER RESOURCES DRAFT PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provisions 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 City of Morganton is hereby authorized to discharge wastewater from a facility located at the Catawba River Pollution Control Facility 1000 Vine Arden Road, Morganton, NC 28655 Burke County to receiving waters designated as the Catawba River in the Catawba River Basin, in accordance with effluent limitations, monitoring requirements, and other applicable conditions set forth in Parts I, II, III, and IV hereof. This permit shall become effective: Month DD, 2022. This permit and authorization to discharge shall expire at midnight on February 26, 2027. Signed this day: Month DD, 2022. Draft for Richard E. Rogers Jr., Director Division of Water Resources By Authority of the Environmental Management Commission Permit NC0026573 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. The City of Morganton is hereby authorized to: 1. Continue to operate an 8.0 MGD capacity wastewater treatment facility with an approved authorization to discharge 8.0 MGD with the following components: • Influent pumps • Mechanical bar screen • Wet well • Grit removal structure (cyclone degritter) • Two primary clarifiers • Three equalization basins • Three aeration basins • Four secondary clarifiers • Chlorine contact basin and dechlorination structure • Sludge holding tank • Dewatering centrifuge structure • Aerobic digestors • Composting site • Back-up power (diesel generator) 2. Discharge treated wastewater from the Facility into the Catawba River, classified as WS-IV and critical area (CA), in the Catawba River Basin, through outfall 001. The outfall location is specified on the attached map. 3. Operate the Facility to treat up to 10.5 MGD after receiving an Authorization to Construct (AtC) from the Division and submitting an engineering certification confirming compliance with the 10.5 MGD flow tier limitation page once the effluent limits page is in effect. 4. Operate the Facility to treat up to 13.0 MGD after receiving an AtC from the Division and submitting an engineering certification confirming compliance with the 13.0 MGD flow tier limitation page once the effluent limits page is in effect. Page 2 of 15 Permit NC0026573 PART I A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (8.0 MGD) — OUTFALL 001 [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302] a) Beginning on the effective date of this permit and lasting until expiration or until the Facility submits an engineering certification confirming compliance with the 10.5 MGD flow tier limitation page, the Permittee is authorized to discharge from outfall 001, treated municipal wastewater. Such discharges shall be limited and monitored' by the Permittee as specified below: PARAMETER Code EFFLUENT LIMITS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample Type Sample Location2 Flow 50050 8.0 MGD Continuous Recording I or E BOD5 (20°C) 3 C0310 30.0 mg/L 45.0 mg/L Daily Composite I and E Total Suspended Solids3 C0530 30.0 mg/L 45.0 mg/L Daily Composite I and E Ammonia (NH3 as N) C0610 8.4 mg/L 25.3 mg/L Daily Composite E Fecal Coliform (Geometric Mean) 31616 200/100 mL 400/100 mL Daily Grab E pH 00400 Between 6.0 and 9.0 standard units Daily Grab E Dissolved Oxygen 00300 Daily Average > 5 mg/L Daily Grab E Dissolved Organic Carbon 00681 Monitor and Report, µg/L Quarterly Grab E Total Residual Chlorine (TRC) 4 50060 28.0 µg/L Daily Grab E Temperature 00010 Monitor and Report °C Daily Grab E Conductivity 00094 Monitor and Report, µmho/cm Daily Grab E Total Hardness5 [as CaCO3] 00900 Monitor and Report, mg/L Quarterly Composite E Total Phosphorus (TP) C0665 Monitor and Report, mg/L Monthly Composite E Total Nitrogen 6 (TN) C0600 Monitor and Report, mg/L Monthly Composite E Antimony 01097 Monitor and Report, µg/L Quarterly Composite E Aluminum 01105 Monitor and Report µg/L Quarterly Composite E Total Copper? 01042 85.9 µg/L 96.1 µg/L Monthly Composite E Total Silver 01077 Monitor and Report µg/L Quarterly Composite E PFAS8 various See Footnote 8 E Total Hardness5 [as CaCO3] 00900 Monitor and Report, mg/L Quarterly Grab U Conductivity 00094 Monitor and Report, µmho/cm Variable 940 Grab U and D Dissolved Oxygen 00300 Monitor and Report, mg/L Variable 9,10 Grab U and D Temperature 00010 Monitor and Report, °C Variable 9,1° Grab U and D Effluent Pollutant Scanil NC01 Monitor and Report Footnote 11 E Chronic Toxicity12 TGP3B See Footnote 12 Quarterly Composite E Footnotes: 1. The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application system. See Special Condition A. (7). 2. Sample Location: E — Effluent, I — Influent, U — Upstream about 250 feet of the outfall, D — Downstream at Huffman Bridge Road about 2.3 miles of the outfall. Page 3 of 15 Permit NC0026573 3. The monthly average effluent BOD5 and total suspended solids concentrations shall not exceed 15% of the respective influent value (85 % removal). 4. The Division shall consider all effluent total residual chlorine values reported below 50 ug/1 to be in compliance with the permit. However, the Permittee shall continue to record and submit all values reported by a North Carolina certified laboratory (including field certified), even if these values fall below 50 ug/l. 5. Effluent Total Hardness sampling shall be performed in conjunction with testing for hardness -dependent metals (cadmium, copper, lead, nickel, silver, and zinc). The Permittee shall sample instream hardness upstream of the Facility's discharge. The sample shall be representative of the hardness in the receiving stream. 6. For a given wastewater sample, total nitrogen (TN) = TKN + NO3-N + NO2-N, where TKN is total Kjeldahl nitrogen, and NO3-N and NO2-N are nitrate and nitrite nitrogen, respectively. 7. See Special condition A. (9) Schedule of compliance for copper. 8. 2/year PFAS effluent monitoring shall commence after EPA has a final wastewater method in 40 CFR136 published in the Federal Register. See Special Condition A. (10.) 9. Variable monitoring frequency is defined as follows: samples collected three times per week during June 1 through September 30 and once per week October 1 through May 31. 10. If the Permittee is a member of a monitoring coalition program, sampling may be waived as long as the monitoring coalition agrees to sample at a minimum frequency of quarterly, and the Permittee has obtained approval from DWR-NPDES Permitting Unit that the location being monitored by the Coalition and the sampling is representative of the receiving stream for this discharge. The Permittee is responsible for submitting test results with its permit renewal application package. If Coalition membership is canceled or the Coalition terminates sampling at the approved station, the Permittee will immediately notify the Division and resume sampling for upstream of its discharge. 11. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit. See Special Condition A. (6). 12. Chronic Toxicity (Ceriodaphnia) P/F @ 9.5%, January, April, July, October. See Special Condition A. (4). There shall be no discharge of floating solids or visible foam other than trace amounts. Page 4 of 15 Permit NC0026573 A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (10.5 MGD) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302] a) Beginning when the Facility submits an engineering certification confirming compliance with the 10.5 MGD flow tier limitation page and until the Facility submits an engineering certification confirming compliance with the 13.0 MGD flow tier or expiration, the Permittee is authorized to discharge from outfall 001, treated municipal wastewater. Such discharges shall be limited and monitored' by the Permittee as specified below: PARAMETER Code EFFLUENT LIMITS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample Type Sample Location' Flow 50050 10.5 MGD Continuous Recording I or E BOD5 (20°C) 3 C0310 18.5 mg/L 27.8 mg/L Daily Composite I and E Total Suspended Solids3 C0530 30.0 mg/L 45.0 mg/L Daily Composite I and E Ammonia (NH3 as N) (Apr. 1— Oct. 31) C0610 6.6 mg/L 19.8 mg/L Daily Composite E Ammonia (NH3 as N) (Nov. 1— Mar. 31) C0610 13.3 mg/L 35.0 mg/L Daily Composite E Fecal Coliform (Geometric Mean) 31616 200/100 mL 400/100 mL Daily Grab E pH 00400 Between 6.0 and 9.0 standard units Daily Grab E Dissolved Oxygen 00300 Daily Average > 5 mg/L Daily Grab E Dissolved Organic Carbon 00681 Monitor and Report, µg/L Quarterly Grab E Total Residual Chlorine (TRC) 4 50060 28.0 µg/L Daily Grab E Temperature 00010 Monitor and Report °C Daily Grab E Conductivity 00094 Monitor and Report, µmho/cm Daily Grab E Total Hardness [as CaCO3] 00900 Monitor and Report, mg/L Quarterly Composite E Total Nitrogen 6 (TN) C0600 Monitor and Report, mg/L Monthly Composite E Total Phosphorus (TP) C0665 Monitor and Report, mg/L Monthly Composite E TN Load' QY600 Monitor and Report, Ib/yr Annual Calculated E TP Load' QY665 Monitor and Report, Ib/yr Annual Calculated E Aluminum 01105 Monitor and Report, µg/L Quarterly Composite E Antimony 01097 Monitor and Report, µg/L Quarterly Composite E Total Copper 01042 68.0, µg/L 76.8, µg/L Monthly Composite E Total Silver 01077 Monitor and Report, µg/L Quarterly Composite E PFAS8 various See Footnote 8 E Total Hardness' [as CaCO3] 00900 Monitor and Report, mg/L Quarterly Grab U Conductivity 00094 Monitor and Report, µmho/cm Variable 9,10 Grab U and D Dissolved Oxygen 00300 Monitor and Report, mg/L Variable 9,1° Grab U and D Temperature 00010 Monitor and Report, °C Variable 9,1° Grab U and D Effluent Pollutant Scan NC01 Monitor and Report Footnote 11 E Chronic Toxicity'2 TGP3B See Footnote 12 Quarterly Composite E Footnotes: 1. The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application system. See Special Condition A. (7). 2. Sample Location: E — Effluent, I — Influent, U — Upstream about 250 feet West of the outfall, D — Downstream at Huffman Bridge Road about 2.3 miles NE of the outfall. Page 5 of 15 Permit NC0026573 3. The monthly average effluent BOD5 and total suspended solids concentrations shall not exceed 15% of the respective influent value (85 % removal). 4. The Division shall consider all effluent total residual chlorine values reported below 50 ug/1 to be in compliance with the permit. However, the Permittee shall continue to record and submit all values reported by a North Carolina certified laboratory (including field certified), even if these values fall below 50 ug/1. 5. Effluent Total Hardness sampling shall be performed in conjunction with testing for hardness -dependent metals (cadmium, copper, lead, nickel, silver, and zinc). The Permittee shall sample instream hardness upstream of the Facility's discharge. The sample shall be representative of the hardness in the receiving stream. 6. For a given wastewater sample, total nitrogen (TN) = TKN + NO3-N + NO2-N, where TKN is total Kjeldahl nitrogen, and NO3-N and NO2-N are nitrate and nitrite nitrogen, respectively. 7. TN (or TP) Load is the mass quantity of Total Nitrogen (or Total Phosphorus) discharged in a given period of time. See Special Condition A. (5.), Calculation of Nutrient Loads. Total Nitrogen (TN) load limits and Total Phosphorus (TP) load limits are annual limits and apply on a calendar year basis. 8. 2/year PFAS effluent monitoring shall commence after EPA has a final wastewater method in 40 CFR136 published in the Federal Register. See Special Condition A. (10.) 9. Variable monitoring frequency is defined as follows: samples collected three times per week during June 1 through September 30 and once per week October 1 through May 31. 10. If the Permittee is a member of a monitoring coalition program, sampling may be waived as long as the monitoring coalition agrees to sample at a minimum frequency of quarterly, and the Permittee has obtained approval from DWR- NPDES Permitting Unit that the location being monitored by the Coalition and the sampling is representative of the receiving stream for this discharge. The Permittee is responsible for submitting test results with its permit renewal application package. If Coalition membership is canceled or the Coalition terminates sampling at the approved station, the Permittee will immediately notify the Division and resume sampling for upstream of its discharge. 11. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit. See Special Condition A. (6). 12. Chronic Toxicity (Ceriodaphnia) P/F @ 12.0%, January, April, July, October. See Special Condition A. (4). There shall be no discharge of floating solids or visible foam other than trace amounts. Page 6of15 Permit NC0026573 A. (3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (13.0 MGD) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302] a) After submitting an Engineering Certificate for expansion to 13.0 MGD and lasting until expiration of the permit, the Permittee is authorized to discharge from outfall 001, treated municipal wastewater. Such discharges shall be limited and monitored' by the Permittee as specified below: PARAMETER Code EFFLUENT LIMITS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample Type Sample Location2 Flow 50050 13.0 MGD Continuous Recording I or E Total Monthly Flow 82220 Monitor and Report, MG Continuous Calculated I or E BOD5 (20°C) 3 C0310 15.0 mg/L 22.5 mg/L Daily Composite I and E Total Suspended Solids3 C0530 30.0 mg/L 45.0 mg/L Daily Composite I and E Ammonia (NH3 as N) (Apr. 1— Oct. 31) C0610 5.6 mg/L 16.8 mg/L Daily Composite E Ammonia (NH3 as N) (Nov. 1—Mar. 31) C0610 11.0 mg/L 33.0 mg/L Daily Composite E Fecal Coliform (Geometric Mean) 31616 200/100 mL 400/100 mL Daily Grab E pH 00400 Between 6.0 and 9.0 standard units Daily Grab E Dissolved Oxygen 00300 Daily Average > 5 mg/L Daily Grab E Dissolved Organic Carbon 00681 Monitor and Report, µg/L Quarterly Grab E Total Residual Chlorine (TRC) 4 50060 28 /L µg Daily Grab E Temperature 00010 Monitor and Report °C Daily Grab E Conductivity 00094 Monitor and Report, µmho/cm Daily Grab E TKN 00625 Monitor and Report, mg/L Weekly Composite E NO2 —N + NO3—N 00630 Monitor and Report, mg/L Weekly Composite E Total Hardness5 [as CaCO3] 00900 Monitor and Report, mg/L Quarterly Composite E Total Nitrogen 6 (TN) C0600 Monitor and Report, mg/L Weekly Composite E Total Phosphorus (TP) C0665 Monitor and Report, mg/L Weekly Composite E TN Load7 QY600 146,659 Ib/year Annual Calculated E TP Load7 QY665 33,200 lb/year Annual Calculated E Aluminum 01105 Monitor and Report, µg/L Quarterly Composite E Antimony 01097 Monitor and Report, µg/L Quarterly Composite E Total Copper 01042 57.0, µg/L 64.9, µg/L Monthly Composite E Total Silver 01077 Monitor and Report, µg/L Quarterly Composite E Selenium 01147 Monitor and Report, µg/L Quarterly Composite E PFAS8 various See Footnote 8 E Total Hardness [as CaCO3] 00900 Monitor and Report, mg/L Quarterly Grab U Conductivity 00094 Monitor and Report, µmho/cm Variable 9,10 Grab U and D Dissolved Oxygen 00300 Monitor and Report, mg/L Variable 9, 10 Grab U and D Temperature 00010 Monitor and Report, °C Variable 9,10 Grab U and D Effluent Pollutant Scanll NC01 Monitor and Report Footnote 11 E Chronic Toxicity12 TGP38 See Footnote 12 Quarterly Composite E Page 7 of 15 Permit NC0026573 Footnotes: 1. The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application system. See Special Condition A. (7). 2. Sample Location: E — Effluent, I — Influent, U — Upstream about 250 feet West of the outfall, D — Downstream at Huffman Bridge Road about 2.3 miles NE of the outfall. 3. The monthly average effluent BOD5 and total suspended solids concentrations shall not exceed 15% of the respective influent value (85 % removal). 4. The Division shall consider all effluent total residual chlorine values reported below 50 ug/1 to be in compliance with the permit. However, the Permittee shall continue to record and submit all values reported by a North Carolina certified laboratory (including field certified), even if these values fall below 50 ug/1. 5. Effluent Total Hardness sampling shall be performed in conjunction with testing for hardness -dependent metals (cadmium, copper, lead, nickel, silver, and zinc). The Permittee shall sample instream hardness upstream of the Facility's discharge. The sample shall be representative of the hardness in the receiving stream. 6. For a given wastewater sample, total nitrogen (TN) = TKN + NO3-N + NO2-N, where TKN is total Kjeldahl nitrogen, and NO3-N and NO2-N are nitrate and nitrite nitrogen, respectively. 7. TN (or TP) Load is the mass quantity of Total Nitrogen (or Total Phosphorus) discharged in a given period of time. See Special Condition A. (5.), Calculation of Nutrient Loads. Total Nitrogen (TN) load limits and Total Phosphorus (TP) load limits are annual limits and apply on a calendar year basis. 8. 2/year PFAS effluent monitoring shall commence after EPA has a final wastewater method in 40 CFR136 published in the Federal Register. See Special Condition A. (10.) 9. Variable monitoring frequency is defined as follows: samples collected three times per week during June 1 through September 30 and once per week October 1 through May 31. 10. If the Permittee is a member of a monitoring coalition program, sampling may be waived as long as the monitoring coalition agrees to sample at a minimum frequency of quarterly, and the Permittee has obtained approval from DWR- NPDES Permitting Unit that the location being monitored by the Coalition and the sampling is representative of the receiving stream for this discharge. The Permittee is responsible for submitting test results with its permit renewal application package. If Coalition membership is canceled or the Coalition terminates sampling at the approved station, the Permittee will immediately notify the Division and resume sampling for upstream of its discharge. 11. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit. See Special Condition A. (6). 12. Chronic Toxicity (Ceriodaphnia) P/F @ 14.5%, January, April, July, October. See Special Condition A. (4). There shall be no discharge of floating solids or visible foam other than trace amounts. Page 8 of 15 Permit NC0026573 A. (4.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) [15A NCAC 02B.0200 et seq.] The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 9.5% at 8.0 MGD, 12.0% at 10.5 MGD, and 14.5% at 13.0 MGD. The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -December 2010) or subsequent versions. The tests will be performed during the months of January, April, July, 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 II Chronic Whole Effluent Toxicity Test Procedure" (Revised -December 2010 or subsequent versions). All toxicity testing results required as part of this permit condition will be entered electronically using the Division's eDMR system 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, DWR Form AT-3 (original) is to be sent to the following address: Attention: North Carolina Division of Water Resources Water Sciences Section/Aquatic Toxicology Branch 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Or, results can be sent to the email, ATForms.ATB@ncdenr.gov. Completed Aquatic Toxicity Test Forms shall be filed with the Water 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 Water 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. Assessment of toxicity compliance is based on the toxicity testing quarter, which is the three-month time interval that begins on the first day of the month in which toxicity testing is required by this permit and continues until the final day of the third month. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Resources 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. Page 9of15 Permit NC0026573 A. (5.) CALCULATION OF TOTAL NITROGEN AND TOTAL PHOSPHORUS LOADS [G.S. 143- 215.1(B)] Total Nitrogen (TN) load limits and total phosphorous (TP) load limits are annual limits and apply on a calendar year basis for the 7.5 MGD and 10.5 MGD flow tiers. (a.) The Permittee shall calculate annual TN/TP loads as follows: (i.) Monthly TN (or TP) Load (lb/mo) = TN (or TP) x TMF x 8.34 where: TN or TP = TMF the average Total Nitrogen or Total Phosphorus concentration (mg/L) of the composite samples collected during the month 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 the 12 Monthly TN (or TP) Loads for the calendar year (b.) The Permittee 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 calendar year's results (lb/yr) with the December report for that year. A. (6.) EFFLUENT POLLUTANT SCAN [G.S. 143-215.1(B)] a) The Permittee shall perform a total of three (3) Effluent Pollutant Scans for all parameters listed below. One scan must be performed in each of the following years: 2024, 2025, and 2026. Analytical methods shall be in accordance with 40 CFR Part 136 and shall be sufficiently sensitive to determine whether parameters are present in concentrations greater than applicable standards and criteria. Samples should be collected with one quarterly toxicity test each year and must represent seasonal variation [i.e., do not sample in the same quarter every year]. Unless otherwise indicated, metals shall be analyzed as "total recoverable." Ammonia (as N) Chlorine (total residual, TRC) Dissolved oxygen Nitrate / Nitrite Kjeldahl nitrogen Oil and grease Phosphorus Total dissolved solids Hardness Antimony Arsenic Beryllium Cadmium Chromium Copper Lead Mercury (Method 1631E) Nickel Selenium Silver Thallium Zinc Cyanide Total phenolic compounds Volatile organic compounds: C0610 50060 00300 00630 00625 00556 C0665 70295 00900 01097 01002 01012 01027 C0034 01042 01051 COMER 01067 01147 01077 01059 01092 00720 32730 Trans-1,2-dichloroethylene 1,1-dichloroethylene 1,2-dichloropropane 1,3-dichloropropylene Ethylbenzene Methyl bromide Methyl chloride Methylene chloride 1,1,2,2-tetrachloroethane Tetrachloroethylene Toluene 1,1,1-trichloroethane 1,1,2-trichloroethane Trichloroethylene Vinyl chloride Acid -extractable compounds: 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 Page 10 of 15 34546 Bis (2-chloroethyl) ether 34273 34501 Bis (2-chloroisopropyl) ether 34283 C0541 Bis (2-ethylhexyl) phthalate CO100 77163 4-bromophenyl phenyl ether 34636 34371 Butyl benzyl phthalate 34292 34413 2-chloronaphthalene 34581 34418 4-chlorophenyl phenyl ether 34641 34423 Chrysene 34320 81549 Di-n-butyl phthalate 39110 34475 Di-n-octyl phthalate 34596 34010 Dibenzo(a,h)anthracene 34556 34506 1,2-dichlorobenzene 34536 34511 1,3-dichlorobenzene 34566 39180 1,4-dichlorobenzene 34571 39175 3,3-dichlorobenzidine 34631 Diethyl phthalate 34336 34452 Dimethyl phthalate 34341 34586 2,4-dinitrotoluene 34611 34601 2,6-dinitrotoluene C0626 34606 1,2-diphenylhydrazine 34346 34657 Fluoranthene C0376 34616 Fluorene 34381 34591 Hexachlorobenzene C0700 34646 Hexachlorobutadiene C0702 39032 Hexachlorocyclo-pentadiene 34386 Acrolein Acrylonitrile Benzene Bromoform Carbon tetrachloride Chlorobenzene Chlorodibromomethane Chloroethane 2-chloroethyl vinyl ether Chloroform Dichlorobromomethane 1,1-dichloroethane 1,2-dichloroethane 34210 34215 34030 32104 32102 34301 34306 85811 34576 32106 32101 34496 32103 Phenol 2,4,6-trichlorophenol Base -neutral comvounds: Acenaphthene Acenaphthylene Anthracene Benzidine Benzo(a)anthracene Benzo(a)pyrene 3,4 benzofluoranthene Benzo(ghi)perylene Benzo(k)fluoranthene Bis (2-chloroethoxy) methane 34694 34621 34205 34200 CO220 39120 C0526 34247 34230 34521 34242 34278 Permit Hexachloroethane Indeno(1,2,3-cd)pyrene Isophorone Naphthalene Nitrobenzene N-nitrosodi-n-propylamine N-nitrosodimethylamine N-nitrosodiphenylamine Phenanthrene Pyrene 1,2,4-trichlorobenzene NC0026573 34396 34403 34408 34696 34447 34428 34438 34433 34461 34469 C0551 b) Reporting. Test results shall be reported electronically using the Division's eDMR system or on DWR Form DMR-PPA-1(or on a form approved by the Director) by December 31 st of each designated sampling year. c) The Permittee must at least report completion of the test in the eDMR system by entering "1" or "Y" for parameter code NC01 - Annual Pollutant Scan. If utilizing the DWR Form submit to the following address: NC DEQ / DWR / NPDES Files, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617. Or the form may be uploaded at: https://edocs.deq.nc.gov/Forms/NPDES_WW-EDMR-Supplemental-Form d) Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that Municipal facilities that are subject to the Effluent Pollutant Scan requirements listed above are also subject to additional toxicity testing requirements specified in Federal Regulation 40 CFR 122.21(j)(5). The US EPA requires four (4) toxicity tests for a test organism other than the test species currently required in this permit. The multiple species tests should be conducted either quarterly for a 12-month period prior to submittal of the permit renewal application, or four tests performed at least annually in the four- and one-half year period prior to the application. Samples must represent seasonal variation [i.e., do not sample in the same quarter every year]. These tests shall be performed for acute or chronic toxicity, whichever is specified in this permit. The multiple species toxicity test results shall be filed with the Aquatic Toxicology Branch at the following address: North Carolina Division of Water Resources Water Sciences Section/Aquatic Toxicology Branch 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Or, results can be sent to the email, ATForms.ATB@ncdenr.gov. Contact the Division's Aquatic Toxicology Branch at 919-743-8401 for guidance on conducting the additional toxicity tests and reporting requirements. Results should also be summarized in Part E (Toxicity Testing Data) of EPA Municipal Application Form 2A, when submitting the permit renewal application to the NPDES Permitting Unit. Page 11 of 15 Permit NC0026573 A. (7.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS [G.S. 143-215.1(B)1 Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program reports. The final NPDES Electronic Reporting Rule was adopted and became effective on December 21, 2015. NOTE: This special condition supplements or supersedes the following sections within Part II of this permit (Standard Conditions for NPDES Permits): • Section B. (11.) Signatory Requirements • Section D. (2.) Reporting • Section D. (6.) Records Retention • Section E. (5.) Monitoring Reports 1. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)1 The Permittee shall report discharge monitoring data electronically using the NC DWR's Electronic Discharge Monitoring Report (eDMR) internet application. Monitoring results obtained during the previous month(s) shall be summarized for each month and submitted monthly electronically using eDMR. The eDMR system allows permitted facilities to enter monitoring data and submit DMRs electronically using the internet. The eDMR system may be accessed at: https://deq.nc.gov/about/divisions/water-resources/edmr. If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility being physically located in an area where less than 10 percent of the households have broadband access, then a temporary waiver from the NPDES electronic reporting requirements may be granted and discharge monitoring data may be submitted on paper DMR forms (MR 1, 1.1, 2, 3) or alternative forms approved by the Director. Duplicate signed copies shall be submitted to the following address: NC DEQ / Division of Water Resources / Water Quality Permitting Section ATTENTION: Central Files 1617 Mail Service Center Raleigh, North Carolina 27699-1617 See "How to Request a Waiver from Electronic Reporting" section below. Regardless of the submission method, the first DMR is due on the last day of the month following the issuance of the permit or, in the case of a new facility, on the last day of the month following the commencement of discharge. NPDES Electronic Reporting Rule — Phase 2 Extension. EPA extended the Phase 2 deadline to December 21, 2025. The current compliance date, effective January 4, 2021, was extended as a final regulation change published in the November 2, 2020 Federal Register. Starting on December 21, 2025, the Permittee must electronically report the following compliance monitoring data and reports, when applicable: • Sewer Overflow/Bypass Event Reports; • Pretreatment Program Annual Reports; and • Clean Water Act (CWA) Section 316(b) Annual Reports. Page 12 of 15 Permit NC0026573 The Permittee may seek an electronic reporting waiver from the Division (see "How to Request a Waiver from Electronic Reporting" section below). 2. Electronic Submissions In accordance with 40 CFR 122.41(1)(9), the Permittee must identify the initial recipient at the time of each electronic submission. The Permittee should use the EPA's website resources to identify the initial recipient for the electronic submission. Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity (EPA or the state authorized by EPA to implement the NPDES program) that is the designated entity for receiving electronic NPDES data [see 40 CFR 127.2(b)]. EPA plans to establish a website that will also link to the appropriate electronic reporting tool for each type of electronic submission and for each state. Instructions on how to access and use the appropriate electronic reporting tool will be available as well. Information on EPA's NPDES Electronic Reporting Rule is found at https://www.federalregister.gov/documents/2015/ 10/22/2015-24954/national-pollutant-discharge-elimination- system-npdes-electronic-reporting-rule Electronic submissions must start by the dates listed in the "Reporting Requirements" section above. 3. How to Request a Waiver from Electronic Reporting The Permittee may seek a temporary electronic reporting waiver from the Division. To obtain an electronic reporting waiver, a permittee must first submit an electronic reporting waiver request to the Division. Requests for temporary electronic reporting waivers must be submitted in writing to the Division for written approval at least sixty (60) days prior to the date the Facility would be required under this permit to begin submitting monitoring data and reports. The duration of a temporary waiver shall not exceed 5 years and shall thereupon expire. At such time, monitoring data and reports shall be submitted electronically to the Division unless the permittee re -applies for and is granted a new temporary electronic reporting waiver by the Division. Approved electronic reporting waivers are not transferrable. Only permittees with an approved reporting waiver request may submit monitoring data and reports on paper to the Division for the period that the approved reporting waiver request is effective. Information on eDMR and the application for a temporary electronic reporting waiver are found on the following web page: http://deq.nc.gov/about/divisions/water-resources/edmr 4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)1 All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II, Section B. (11.)(a) or by a duly authorized representative of that person as described in Part II, Section B. (11.)(b). A person, and not a position, must be delegated signatory authority for eDMR reporting purposes. For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user account and login credentials to access the eDMR system. For more information on North Carolina's eDMR system, registering for eDMR, and obtaining an eDMR user account, please visit the following web page: http://deq.nc.gov/about/divisions/water-resources/edmr Certification. Any person submitting an electronic DMR using the state's eDMR system shall make the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL BE ACCEPTED: Page 13 of 15 Permit NC0026573 "I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations." 5. Records Retention [Supplements Section D. (6.)1 The Permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions. These records or copies shall be maintained for a period of at least 3 years from the date of the report. This period may be extended by request of the Director at any time [40 CFR 122.41]. Map will be added here once doc is in pdf. A. (8.) MERCURY MINIMIZATION PLAN (MMP) [G.S. 143-215.1(B)] The Permittee shall continue implementing the mercury minimization plan during this permit term. The MMP should place emphasis on identification of mercury contributors and goals for reduction. Results shall be summarized and submitted with the next permit renewal. Performance of the Mercury Minimization Plan will meet the requirements of the TMDL (Total Maximum Daily Load) for mercury approved by USEPA on October 12, 2012, unless and until a Waste Load Allocation specific to this facility is developed and this NPDES permit is amended to require further actions to address the Waste Load Allocation. A. (9.) SCHEDULE OF COMPLIANCE FOR COPPER [NCGS 143-215.1 (b)] 1. On date, within one (1) year of the permit effective date, the Permittee shall submit to the Division a Corrective Action Plan (CAP) for Division approval (which could include a pretreatment local limit assessment), summarizing the strategy or actions to be taken to achieve compliance with the copper limitations listed in Section A. (1.). This plan will include specific dates for the completion or implementation of each action. 2. On date, within two (2) years of the permit effective date, the Permittee shall submit to the Division a summary of actions taken towards achieving compliance with the copper limitations specified in Section A. (1.). 3. The Permittee shall achieve compliance with copper limitations specified in Section A. (1.) by date, within three (3) years of the permit effective date. Alternatively, the Permittee may request this Schedule of Compliance be removed, and the copper limitations specified in Section A. (1.) be placed into effect. Upon approval of the Corrective Action Plan (CAP) by the Division, the report, actions, and implementation dates become an enforceable part of this permit. Any modifications to the schedule shall be requested to the Division at least ninety (90) days before the deadline. Modifications to the schedule in excess of four months will be subject to public notice. Annual summaries and the CAP shall include the owner's name, NPDES permit number, and a Permittee contact person and shall be submitted to: NCDEQ / Division of Water Resources NPDES Municipal Permitting Unit — NPDES and Pretreatment File 1617 Mail Service Center Raleigh, NC 27699-1617 Page 14 of 15 Permit NC0026573 A. (10.) PFAS MONITORING REQUIREMENT [NCGS 143-215.1 (b)] This reporting requirement for the per- and polyfluoroalkyl substances (PFAS) parameters listed under Table 1 of the Final Method 1633 takes effect the first full calendar quarter following six (6) months after EPA publishes a 40 CFR part 136 Final PFAS Method for wastewater in the Federal Register. Monitoring will be at a frequency of 2/year. Find the current parameters listed under Table 1 of the August 2021 Draft Method 1633 Analysis of Per- and Polyfluoroalkyl Substances (PFAS) in Aqueous, Solid, Biosolids, and Tissue Samples by LC- MS/MS at: https://www.epa.gov/system/files/documents/2021-09/method 1633_draft_aug-2021.pdf Page 15 of 15 Catawba River Pollution Control Facility — NC0026573 City of Morganton - Burke County Outfall Latitude: 35° 46' 42.8" N Basin: Catawba River Basin Outfall Longitude: 81° 39' 33.5" W Sub -Basin: 03--08-31 Quad #: D 12 SW (Morganton -North) HUC: 03050101 Stream Class: WS-IV CA Receiving Stream: Catawba River Permitted Flow: 8.0, 10.5 and 13.0 MGD Facility Location North rLat: 35° 46' 34.7" N Long:: 81° 39' 48.7" W