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HomeMy WebLinkAboutNC0021717_Draft Permit_20240306ROY COOPER Governor ELIZABETH S. BISER Secretary RICHARD E. ROGERS, JR. Director Mr. Ken Noland, Town Manager Town of Wilkesboro P.O. Box 1056 Wilkesboro, North Carolina 28697 Dear Mr. Noland: NORTH CAROLINA Environmental Quality March 5, 2024 Subject: Draft NPDES Permit Renewal Permit NCO021717 Cub Creek WWTP Wilkes County Grade IV Biological WPCS SIC Code 4952 Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please review this draft carefully to ensure thorough understanding of the requirements and conditions it contains. There are several changes from the existing permit, including the following: • As expansion of the Cub Creek WWTP has been approved by the Division, an expansion page has been added to the permit for 8.0 MGD flow tier [See A.(3.)]. As review of compliance history and submitted data demonstrated no cause for continued concern, the oil and grease limits and monitoring requirements have been removed from the permit [See A.(1.) and A.(2.)]. • Based on the reasonable potential analysis (RPA) showing reasonable potential to violate state water quality standards, total selenium limits and monthly monitoring have been added to the permit at all flow tiers [See A.(1.), A.(2.) and A.(3.)]. Total Residual Chlorine (TRC) limits and monitoring requirement have not been in the permit, as the facility uses UV for disinfection. However, in the event of an emergency where chlorination is required as a backup or temporary means of disinfection at the facility, a TRC limit and monitoring requirement have been added to the permit [See A.(1.), A.(2.) and A.(3.)]. Please note that TRC monitoring is only required when chlorine is used at the plant, and as part of the regular Effluent Pollutant Scans. Based on review of instream monitoring requirements and due to the need for instream data to understand the impact of the facility expansion on the receiving waterbody, instream monitoring is only for turbidity, pH, ammonia, TKN, NO2+NO3, TP and fecal coliform has been added to the permit. To improve clarity on instream monitoring requirements, Special Condition A.(4.) has been added to the permit. • Based on discussion with the Basin Planning Branch and due to the need for instream data to understand the impact of the facility expansion on the receiving waterbody, instream monitoring is only provisionally waived due to membership in the Yadkin -Pee Dee River Basin Association (YPDRBA) if YPDRBA conducts representative instream sampling upstream of the facility's discharge. Should YPDRBA not activate a representative upstream monitoring station, the instream monitoring requirements shall immediately be reinstated. D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources 512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611 NORTH CAROLINA 919.707.9000 neper .mo F.o. wnual� • 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 in order 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 A.(L), A.(2.) and A.(3.)]. The Town of Wilkesboro reported Total Silver at less than detection, with detection levels < 5.0 µg/L. The Town's allowable discharge concentration is 1.0 µg/L for Total Silver. DWR's laboratory identifies the target Practical Quantification Limit (PQL) for Total 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. If no approved methods are capable of achieving a detection level below the permit discharge requirement (or allowable discharge concentration) the method with the lowest detection level must be used. The Town should use sufficiently sensitive test methods for all pollutants, including when performing Effluent Pollutant Scans. • Per Session Law 2005-190 Senate Bill 981, the nutrient loading has been frozen and Total Nitrogen (TN) and Total Phosphorus (TP) mass -loading have been added to the permit for the 8.0 MGD flow tier [See A.(3.)]. • For calculation of total nitrogen, monthly monitoring of TKN and NO2+NO3 has been added to the permit at all flow tiers [See A.(1.), A.(2.) and A.(3.)]. • For calculation of TN and TP Loads, monthly reporting of Total Monthly Flow has been added to the permit at the 8.0 MGD flow tier [See A.(3.)]. • For clarification on calculation of TN and TP Loads, Total Monthly Flow reporting and Special Condition A.(6.) Calculation of Total Nitrogen and Total Phosphorous Loads has been added to the permit. • As the facility receives complex waste streams from various industrial users with the potential to discharge 1,4-dioxane via their pretreatment program and the facility discharges above WS-IV waters, quarterly monitoring for 1,4-dioxane as well as a 1,4-dioxane reopener condition have been added to the permit [See A.(L), A.(2.), A.(3.) and Special Condition A.(9.)]. • To assess contributions of PFAS chemicals to the Cub Creek WWTP and assess levels in the facility effluent, Special Condition A.(11.) has been added to the permit. • Some of the wording has changed in Special Condition A.(4.), Chronic Toxicity Permit Limit, please review each paragraph carefully. • Special Condition A.(5.) has been modified to include the specific three years in which the Effluent Pollutant Scan shall be performed (2025, 2026, and 2027). In addition, at the end of the Special Condition, 2nd species Toxicity Testing Requirements for municipal permit renewals per Federal Regulations [40 CFR 122.210)(5)] have been added. • 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. • Parameter codes have been added to the Effluent Limitations and Monitoring Requirements [ See A.(L), A.(2.) and A.(3.)]. D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources 512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611 NORTH CAROLINA 919.707.9��� gaper .mo F.o. wquay The NPDES standard conditions (Parts II, III, and IV) that are a part of the permit are not included in this draft document (cover, map, and Part I). The conditions are the same as in your current permit except that agency and division names have been updated. The latest version is available at https:/ibit.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 Wilkes 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 call me at (919) 707-3609 or by email at nick.coco@deq.nc.gov. Sincerely, EDO CUSigned by: 00A4FBFCA14FD... Nick Coco, PE NPDES Municipal Permitting Unit Hardcopy: NPDES Files Ecopy: US EPA Region 4 DWR/Winston-Salem Regional Office/Water Quality/Lon Snider & Jenny Graznak DWR/Operator Certification Program/Jeff Talbot DWR/Ecosystems Branch/Mark Vander Borgh DWR/Aquatic Toxicology Branch/Cindy Moore & Molly Nicholson DWR/Municipal Permitting Unit/Keyes McGee HDR Inc./Wes Bramlett, Lara Grotz & Kim Colson DWI/Ali Ajami D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources 512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611 NORTH CAROLINA 919.707.90�0 gaper .mo F.o. wquay Permit NCO021717 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF WATER RESOURCES PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM N( PDES) 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 Town of Wilkesboro is hereby authorized to discharge wastewater from a facility located at the Cub Creek Wastewater Treatment Plant 700 Snyder Street Wilkesboro Wilkes County to receiving waters designated as the Yadkin River in the Yadkin -Pee Dee River Basin in accordance with the effluent limitations, monitoring requirements, and other applicable conditions set forth in Parts I,11, III, and IV hereof. This permit shall become effective............ Month xx, 20xx. This permit and authorization to discharge shall expire at midnight on ....................... September 30, 2028. Signed this day ................... Month xx, 20xx. DRAFT Michael J. Montebello, NPDES Permitting Branch Chief Division of Water Resources Page 1 of 19 Permit NCO021717 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. Town of Wilkesboro is hereby authorized to: 1. Continue to operate and maintain the Cub Creek WWTP, an existing 4.9 MGD facility consisting of the following components: • Influent lift station • Aerated equalization basin • Aeration basin • Clarifiers • Aerated digester • Ultraviolet disinfection • Sludge drying beds • Sludge screw press • Flow measurement 2. After receiving an Authorization to Construct from the Division, construct and operate improvements to increase the average design flow of the wastewater treatment facility to 6.6 MGD; and 3. After receiving an Authorization to Construct from the Division, construct and operate improvements to increase the average design flow of the wastewater treatment facility to 8.0 MGD; and 4. Discharge from said treatment works at the location specified on the attached map via Outfall 001 into the Yadkin River, classified C waters in the Yadkin -Pee Dee River Basin and 03040101 HUC. Page 2 of 19 Permit NCO021717 PART A.(L) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [4.9 MGD] [15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.] Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302] (a.) During the period beginning on the effective date of the permit and lasting until expansion above 4.9 MGD or permit expiration, whichever is sooner, the permittee is authorized to discharge treated municipal and industrial wastewater from Outfall 001. Such discharges shall be limited and monitored' by the permittee as specified below: PARAMETER Parameter Code EFFLUENT LIMITS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample Type Sample Locationz Flow 50050 4.9 MGD Continuous Recording I or E BOD, 5 day, 200C 3 C0310 30.0 mg/L 45.0 mg/L Daily Composite I and E Total Suspended Solids C0530 30.0 mg/L 45.0 mg/L Daily Composite I and E NH3 as N (Apr 1 - Oct 31) C0610 21.0 mg/L 1 35.0 mg/L Daily Composite E NH3 as N (Nov 1 - Mar 31) C0610 Monitor and Report Daily Composite E Fecal Coliform 31616 (geometric mean) 200/100 mL 400/100 mL Daily Grab E Dissolved Oxygen 00300 Monitor and Report Daily Grab E pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab E Temperature (°C) 00010 Monitor and Report Daily Grab E Total Residual Chlorine 4 50060 28 µg/L Daily Grab E Total Phosphorus (mg/L) C0665 Monitor and Report Monthly Composite E TKN (mg/L) 00625 Monitor and Report Monthly Composite E NO3-N + NO2-N (mg/L) 00630 Monitor and Report Monthly Composite E Total Nitrogen 5 (mg/L) C0600 Monitor and Report Monthly Calculated E Total Selenium 01147 83.1 µg/L 1 1,230 µg/L Monthly Composite E 1,4-Dioxane6 82388 Monitor and Report Quarterly Grab E PFAS Various Footnote 7 Footnote 7 Grab E Chronic Toxicity' TGP3B Monitor and Report Quarterly Composite E Effluent Pollutant Scan 9 NC01 Monitor and Report Footnote 9 Footnote 9 E Hardness10 -Total as CaCO3 (mg/L) 00900 Monitor and Report Quarterly Composite E Footnotes: 1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. See Special Condition A.(11.). 2. Sample locations I -Influent, E-Effluent. 3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal). 4. The facility shall monitor TRC when using chlorination for disinfection. The Division shall consider all effluent total residual chlorine values reported below 50 µg/l 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 µg/l. 5. For a given wastewater sample, TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total Kjeldahl Nitrogen, and NO3-N and NO2-N are Nitrate and Nitrite Nitrogen, respectively. 6. Samples will be analyzed and reported using sufficiently sensitive test procedures (i.e., methods) approved under 40 CFR part 136 for the analysis of pollutants or pollutant parameters. After a 24-month sampling period, the Permittee may request the Division conduct a review of submitted data for assessment and approval of a 1,4-dioxane monitoring frequency reduction from quarterly to annually. Footnotes continue on the next page. Page 3 of 19 Permit NCO021717 Footnotes continued from A.(1.) Effluent Limitations and Monitoring Requirements: 7. See Special Condition A.(11.). 8. Chronic Toxicity (Ceriodaphnia dubia) P/F at 3.7% with testing in March, June, September, and December. See Special Condition A.(4.). 9. The permittee shall perform three effluent pollution scans during the term of this permit. See Special Condition A.(5.). 10. Effluent hardness shall be performed in conjunction with testing for hardness dependent metals. There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 4 of 19 Permit NCO021717 A.(2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [6.6 MGD] [15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.] Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302] (a.) During the period beginning upon expansion to 6.6 MGD and lasting until expansion to 8.0 MGD or permit expiration, whichever is sooner, the permittee is authorized to discharge treated municipal and industrial wastewater from Outfall 001. Such discharges shall be limited and monitored' by the permittee as specified below: PARAMETER Parameter Code EFFLUENT LIMITS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample Type Sample Locationz Flow 50050 6.6 MGD Continuous Recording I or E BOD, 5 day, 200C 3 C0310 30.0 mg/L 45.0 mg/L Daily Composite I and E Total Suspended Solids C0530 30.0 mg/L 45.0 mg/L Daily Composite I and E NH3 as N (Apr 1 - Oct 31) C0610 16.0 mg/L 1 24.0 mg/L Daily Composite E NH3 as N (Nov 1 - Mar 31) C0610 Monitor and Report Daily Composite E Fecal Coliform 31616 (geometric mean) 200/100 mL 400/100 mL Daily Grab E Dissolved Oxygen 00300 Monitor and Report Daily Grab E pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab E Temperature (°C) 00010 Monitor and Report Daily... Grab E Total Residual Chlorine 4 50060 28 µg/L Daily Grab E Total Phosphorus (mg/L) C0665 Monitor and Report Monthly Composite E TKN (mg/L) 00625 Monitor and Report Monthly Composite E NO3-N + NO2-N (mg/L) 00630 Monitor and Report Monthly Composite E Total Nitrogen s (mg/L) C0600 Monitor and Report Monthly Calculated E Total Selenium 01147 62.5 µg/L 1 927.6 µg/L Monthly Composite E 1,4-Dioxane6 82388 Monitor and Report Quarterly Grab E PFAS Various Footnote 7 Footnote 7 Grab E Chronic Toxicity $ TGP3B Monitor and Report Quarterly Composite E Effluent Pollutant Scan 9 NCO] Monitor and Report Footnote 9 Footnote 9 E Hardness10 -Total as CaCO3 (mg/L) 00900 Monitor and Report Quarterly Composite E Footnotes: 1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. See Special Condition A.(11.). 2. Sample locations I -Influent, E-Effluent. 3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal). 4. The facility shall monitor TRC when using chlorination for disinfection. The Division shall consider all effluent total residual chlorine values reported below 50 µg/l 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 µg/l. 5. For a given wastewater sample, TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total Kjeldahl Nitrogen, and NO3-N and NO2-N are Nitrate and Nitrite Nitrogen, respectively. 6. Samples will be analyzed and reported using sufficiently sensitive test procedures (i.e., methods) approved under 40 CFR part 136 for the analysis of pollutants or pollutant parameters. After a 24-month sampling period, the Permittee may request the Division conduct a review of submitted data for assessment and approval of a 1,4-dioxane monitoring frequency reduction from quarterly to annually. 7. See Special Condition A.(11.). Footnotes continue on the next page. Page 5 of 19 Permit NCO021717 Footnotes continued from A.(2.) Effluent Limitations and Monitoring Requirements: 8. Chronic Toxicity (Ceriodaphnia dubia) P/F at 5.0% with testing in March, June, September, and December. See Special Condition A.(4.). 9. The permittee shall perform three effluent pollution scans during the term of this permit. See Special Condition A.(5.). 10. Effluent hardness shall be performed in conjunction with testing for hardness dependent metals. There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 6 of 19 Permit NCO021717 A.(3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [8.0 MGD] [15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.] Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302] (a.) During the period beginning upon expansion to 8.0 MGD and lasting until permit expiration, the permittee is authorized to discharge treated municipal and industrial wastewater from Outfall 001. Such discharges shall be limited and monitored' by the permittee as specified below: PARAMETER 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 Total Monthly Flow (MG) 82220 Monitor and Report Monthly Calculated E BOD, 5 day, 20°C 3 C0310 24.4 mg/L 36.6 mg/L Daily Composite I and E Total Suspended Solids C0530 30.0 mg/L 45.0 mg/L Daily Composite I and E NH3 as N (Apr 1 - Oct 31) C0610 13.3 mg/L 35.0 mg/L Daily Composite E NH3 as N (Nov 1 - Mar 31) C0610 Monitor and Report Daily Composite E Fecal Coliform 31616 (geometric mean) 200/100 mL 400/100 mL Daily Grab E Dissolved Oxygen 00300 Monitor and Report Daily Grab E pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab E Temperature (°C) 00010 Monitor and Report Daily Grab E Total Residual Chlorine 4 50060 1 1 28 µg/L Daily Grab E TKN (mg/L) 00625 Monitor and Report Monthly Composite E NO3-N + NO2-N (mg/L) 00630 Monitor and Report Monthly Composite E Total Nitrogen s (mg/L) C0600 Monitor and Report Monthly Calculated E TN Load 6 QM600 QY600 Monitor and Report (lb/month) 205,476 lb/yr Monthly Annually Calculated E Total Phosphorus (mg/L) C0665 Monitor and Report Monthly Composite E TP Load s QM600 QY600 Monitor and Report (lb/month) 109,872 lb/yr Monthly Annually Calculated E Total Selenium 01147 52.1 µg/L 1 1 775.1 µg/L Monthly Composite E 1,4-Dioxane7 82388 Monitor and Report Quarterly Grab E PFAS Various Footnote 8 Footnote 8 Grab E Chronic Toxicity 9 TGP3B Monitor and Report Quarterly Composite E Effluent Pollutant Scan 10 NCO] ' Monitor and Report Footnote 10 Footnote 10 E Hardness" -Total as CaCO3 (mg/L) 00900 Monitor and Report Quarterly Composite E Footnotes: 1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. See Special Condition A.(11.). 2. Sample locations I -Influent, E-Effluent. 3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal). 4. The facility shall monitor TRC when using chlorination for disinfection. The Division shall consider all effluent total residual chlorine values reported below 50 µg/l 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 µg/l. 5. For a given wastewater sample, TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total Kjeldahl Nitrogen, and NO3-N and NO2-N are Nitrate and Nitrite Nitrogen, respectively. 6. TN or TP Load is the mass quantity of Total Nitrogen or Total Phosphorus discharged in a given period of time. See Special Condition A.(6.). Footnotes continue on the next page. Page 7 of 19 Permit NCO021717 Footnotes continued from A.(3.) Effluent Limitations and Monitoring Requirements: 7. Samples will be analyzed and reported using sufficiently sensitive test procedures (i.e., methods) approved under 40 CFR part 136 for the analysis of pollutants or pollutant parameters. After a 24-month sampling period, the Permittee may request the Division conduct a review of submitted data for assessment and approval of a 1,4-dioxane monitoring frequency reduction from quarterly to annually. 8. See Special Condition A.(11.). 9. Chronic Toxicity (Ceriodaphnia dubia) P/F at 6.0% with testing in March, June, September, and December. See Special Condition A.(4.). 10. The permittee shall perform three effluent pollution scans during the term of this permit. See Special Condition A.(5.). 11. Effluent hardness shall be performed in conjunction with testing for hardness dependent metals. There shall be no discharge of floating solids or visible foam in other than trace amounts. A.(4.) INSTREAM MONITORING REQUIREMENTS [15A NCAC 02B.0500 et seq.] Beginning on the effective date of this permit and lasting until lasting until permit expiration, the Permittee shall perform instream sampling upstream and downstream of Outfall 001 as specified below: PARAMETER Parameter Code MONITORING REQUIREMENTS Measurement Frequency Sample Type Sample Location' Dissolved Oxygen (mg/L) 00300 Variable Grab U Temperature (°C) 00010 Variable Grab U and D Conductivity (µmhos/cm) 00094 Variable Grab U and D pH (s.u.) 00400 Monthly Grab U and D Fecal Coliform (#/l00mL) 31616 Monthly Grab U and D NH3 as N (mg/L) C0610 Monthly Grab U and D TKN (mg/L) 00625 Monthly Grab U and D NO3-N + NO2-N (mg/L) 00630 Monthly Calculated U and D Total Nitrogen 5 (mg/L) C0600 Monthly Grab U and D Total Phosphorus (mg/L) C0665 Monthly Grab U and D Turbidity (NTUs) 00070 Monthly Grab U and D Hardness -Total as CaCO3 (mg/L) z 00900 Quarterly Grab U and D Fnntnntec! 1. Sample locations U-Upstream = at Wilkesboro Blvd., D-Downstream = 100 yards below the outfall. Upstream and downstream samples shall be grab samples collected 3/week during June, July, August, and September and 1/week during the remainder of the year. Instream sampling requirements are provisionally waived in light of the permittee's participation in the Yadkin -Pee Dee River Basin Association. Should participation in the association cease, all instream sampling requirements are immediately reinstated. Should representative instream monitoring not be conducted by the Yadkin -Pee Dee River Basin Association, instream monitoring requirements are immediately reinstated until confirmation of the coalition's activation of such sampling stations are received by the Division. 2. The permittee shall sample instream hardness upstream of the facility's discharge. The sample shall be representative of the hardness in the stream. Page 8 of 19 Permit NCO021717 A.(5.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) [15A NCAC 02B .0200] [15A NCAC 02B .0500 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 3.7% at 4.9 MGD, 5.0% at 6.6 MGD and 6.0% at 8.0 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 Il Chronic Whole Effluent Toxicity Test Procedure" (Revised December 2010, or subsequent versions). The tests will be performed during the months of March, June, September, and December. These months signify the first month of each three-month toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be obtained during representative effluent discharge and 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 TGP313 for the pass/fail results and THP313 for the Chronic Value. Additionally, DWR Form AT-3 (original) is to be sent to the following address: North Carolina Division of Water Resources Water Sciences Section/Aquatic Toxicology Branch 1621 Mail Service Center Raleigh, NC 27699-1621 Or, results can be sent to the email, ATForms.ATB@deq.nc.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 9 of 19 Permit NCO021717 A.(6.) ADDITIONAL MONITORING REQUIREMENTS FOR PERMIT RENEWAL [G. S. 143-215.1(B)] (a.) Effluent Pollutant Scans. 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: 2025, 2026, and 2027. 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. Each annual sample shall coincide with one quarterly toxicity test each year (see Condition A.(4.) (CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY))), and each must be collected in a different calendar quarter to 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) C0610 Trans-1,2-dichloroethylene 34546 Bis (2-chloroethyl) ether 34273 Chlorine (total residual, TRC) 50060 1, 1 -dichloroethylene 34501 Bis (2-chloroisopropyl) ether 34283 Dissolved oxygen 00300 1,2-dichloropropane C0541 Bis (2-ethylhexyl) phthalate C0100 Nitrate / Nitrite 00630 1,3-dichloropropylene 77163 4-bromophenyl phenyl ether 34636 Kjeldahl nitrogen 00625 Ethylbenzene 34371 Butyl benzyl phthalate 34292 Oil and grease 00556 Methyl bromide 34413 2-chloronaphthalene 34581 Phosphorus C0665 Methyl chloride 34418 4-chlorophenyl phenyl ether 34641 Total dissolved solids 70295 Methylene chloride 34423 Chrysene 34320 Hardness 00900 1,1,2,2-tetrachloroethane 81549 Di-n-butyl phthalate 39110 Antimony 01097 Tetrachloroethylene 34475 Di-n-octyl phthalate 34596 Arsenic 01002 Toluene 34010 Dibenzo(a,h)anthracene 34556 Beryllium 01012 1, 1, 1 -trichloroethane 34506 1,2-dichlorobenzene 34536 Cadmium 01027 1,1,2-trichloroethane 34511 1,3-dichlorobenzene 34566 Chromium C0034 Trichloroethylene 39180 1,4-dichlorobenzene 34571 Copper 01042 Vinyl chloride 39175 3,3-dichlorobenzidine 34631 Lead 01051 Acid -extractable compounds: Diethyl phthalate 34336 Mercury (Method 1631E) COMER P-chloro-m-cresol 34452 Dimethyl phthalate 34341 Nickel 01067 2-chlorophenol 34586 2,4-dinitrotoluene 34611 Selenium 01147 2,4-dichlorophenol 34601 2,6-dinitrotoluene C0626 Silver (PQL < 1 µg/L) 01077 2,4-dimethylphenol 34606 1,2-diphenylhydrazine 34346 Thallium 01059 4,6-dinitro-o-cresol 34657 Fluoranthene C0376 Zinc 01092 2,4-dinitrophenol 34616 Fluorene 34381 Cyanide 00720 2-nitrophenol 34591 Hexachlorobenzene C0700 Total phenolic compounds 32730 4-nitrophenol 34646 Hexachlorobutadiene C0702 Volatile organic compounds: Pentachlorophenol 39032 Hexachlorocyclo-pentadiene 34386 Acrolein 34210 Phenol 34694 Hexachloroethane 34396 Acrylonitrile 34215 2,4,6-trichlorophenol 34621 Indeno(1,2,3-cd)pyrene 34403 Benzene 34030 Base -neutral compounds: Isophorone 34408 Bromoform 32104 Acenaphthene 34205 Naphthalene 34696 Carbon tetrachloride 32102 Acenaphthylene 34200 Nitrobenzene 34447 Chlorobenzene 34301 Anthracene CO220 N-nitrosodi-n-propylamine 34428 Chlorodibromomethane 34306 Benzidine 39120 N-nitrosodimethylamine 34438 Chloroethane 85811 Benzo(a)anthracene C0526 N-nitrosodiphenylamine 34433 2-chloroethyl vinyl ether 34576 Benzo(a)pyrene 34247 Phenanthrene 34461 Chloroform 32106 3,4 benzofluoranthene 34230 Pyrene 34469 Dichlorobromomethane 32101 Benzo(ghi)perylene 34521 1,2,4-trichlorobenzene C0551 1, 1 -dichloroethane 34496 Benzo(k)fluoranthene 34242 1,2-dichloroethane 32103 Bis (2-chloroethoxy) methane 34278 Page 10 of 19 Permit NC0021717 (b.) Effluent Scan Reporting. Test results shall be reported electronically via eDMR by December 31 st of each designated sampling year, except that, subject to prior written approval by the Director, results can be reported on DWR Form DMR-PPA-1 or other form approved by the Director. The permittee must at least report completion of the test in the eDMR system by entering " 1 " or "Y" for parameter code NCO 1 - Annual Pollutant Scan. If written reports are approved, the report shall be submitted to the following address: North Carolina Division of Water Resources Central Files 1617 Mail Service Center Raleigh, North Carolina 27699-1617 Or the form may be uploaded at: https:Hedocs.deq.nc.gov/Forms/NPDES_WW-EDMR- Supplemental-Form (c.) 2nd-Species Toxicity Testing and Reporting. (i.) In addition to the quarterly toxicity tests required in Condition A.(4.) (CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)), the Permittee shall perform and report the results of four (4) toxicity tests using the same test methods using a second species of test organism suitable to the tests being conducted. (ii.) The 2nd species toxicity tests shall be conducted either: (A) Once per quarter in a single 12-month period (four samples); if this option is chosen, the sample for each 2nd species test shall coincide with the quarterly samples collected for (CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)); or (B) Once per 12-month period in the four -and one-half year period prior to the scheduled application for permit renewal (four samples); if this option is chosen, three of the samples for the 2nd species test shall coincide with those for the annual effluent scans and the coincident quarterly toxicity test, and each of the four annual samples shall be collected in a different calendar quarter in order to represent seasonal variation. (iii.) The results of the toxicity tests shall be submitted to 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@ deq.nc.gov. (iv.) Results of the 2nd species tests shall also be summarized in Part E (Toxicity Testing Data) of EPA Municipal Application Form 2A when submitting the permit renewal application to the NPDES Wastewater Program. The Permittee may contact the Division's Aquatic Toxicology Branch at 919-743-8401 for guidance on conducting the additional toxicity tests and reporting of the results. Page 11 of 19 Permit NCO021717 A.(7.) CALCULATION OF TOTAL NITROGEN AND TOTAL PHOSPHOROUS LOADS [G.S. 143-215.1(b)] (a.) The Permittee shall calculate monthly and annual TN and TP Loads as follows: (i.) Monthly TN (or TP) Load (lb/mo) = TN (or TP) x TMF x 8.34 where: TN or TP = the average Total Nitrogen or Total Phosphorous concentration (mg/L) of the composite samples collected during the month TMF = the Total Monthly Flow of wastewater discharged during the month (MG/mo); and 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 discharge monitoring report for that month and shall report each year's annual results (lb/yr) in the December report for that year. A.(8.) MERCURY MINIMIZATION PLAN (MMP) , [G.S. 143-215.1 (B)] The Permittee shall maintain and continue to implement the Mercury Minimization Plan (MMP) developed in the previous permit term. The MMP shall continue to be available for inspection on -site. 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 MMP 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.) NUTRIENT REOPENER FOR HIGH ROCK LAKE [G.S. 143-215.1 (B)] This permit may be reopened and modified to implement nutrient requirements in accordance with any future TMDL and/or nutrient management strategy for High Rock Lake. A.(10.) 1,4-DIOXANE RE -OPENER [G.S. 143-215.1 (B)] Pursuant to N.C. General Statutes Section 143-215.1 and the implementing rules found in the North Carolina Administrative Code at 15A NCAC 2H.0112 (b) (1) and 2H.0114 (a) and Part 11, Sections B- 12 and B-13 of this permit, the Director of DWR may reopen this permit to modify permit requirements to address 1,4-Dioxane monitoring, treatment and/or compliance. Page 12 of 19 Permit NCO021717 A.(11.) PFAS MONITORING REQUIREMENT [G.S. 143-215.1 (b)] (a.) In the absence of an approved 40 CFR Part 136 method published in Federal Register, influent and effluent PFAS monitoring shall be conducted. The 3rd draft or more recent wastewater analytical method 1633 (see 40 CFR 122.21(e)(3)(ii) and 40 CFR 122.44(i)(1)(iv)(B)) shall be used and shall include all target analytes listed under Table 1 of the method until such time as the Permittee uses the approved PFAS Method for wastewater. Effective the first full calendar quarter following six (6) months after EPA publishes a 40 CFR Part 136 PFAS Method for wastewater in the Federal Register, influent and effluent PFAS monitoring shall be conducted using the approved EPA PFAS Method 1633. See Appendix A for list of analytes. (b) Influent and effluent monitoring using the draft analytical method takes effect the first full calendar quarter following six (6) months after the effective date of the permit (Month xx, 2024) and will be at a quarterly frequency thereafter. Appendix A has been added to the permit to identify the current analytes listed under Table 1 of Method 1633 Analysis of Per- and Polyfluoroalkyl Substances (PFAS) in Aqueous, Solid, Biosolids, and Tissue Samples by LC-MS/MS (EPA, January 2024) and the appropriate ICIS codes for use when reporting in the electronic Discharge Monitoring Reports (eDMRs). The method and list of analytes may also be found at: https://www.epa.gov/system/files/documents/2024-01/method-1633-final-for-web-posting.pdf PFAS Monitoring using the Draft Method or January 2024 Method 1633 shall be reported quarterly using the Division -provided submittal form and shall be submitted to the following address: NCDEQ / Division of Water Resources NPDES Permitting 1617 Mail Service Center Raleigh, NC 27699-1617 NCDEQ / Division of Water Resources Winston-Salem Regional Office 450 West Hanes Mill Road, Suite 300 Winston-Salem, NC 27105 Once PFAS monitoring is conducted using the PFAS Method 1633 in 40 CFR Part 136, data shall be reported in the monthly eDMRs. Please note that specific considerations and protocols are required to avoid cross -contamination and minimize sample bias for PFAS. A current listing of laboratories accredited by the Perry Johnson Laboratory Accreditation, Inc. (PJLA), ANSI National Accreditation Board (ANAB), or the American Association for Laboratory Accreditation (A2LA) to perform EPA Method 1633 can be found by contacting the individual associations. Please note that different labs are accredited for different matrices. Sampling and Analytical Notes: • Sampling shall be planned so that required holding times for analytical methods are met. • Using one of the analytical laboratories included above will allow consistency in analytical method and in anticipation of a final method. • "J" flag values shall be reported when the "J" flag value is associated with the method's upper bound. "J" flag values need not be reported when less than the method's Minimum Reporting Level (listed in Method 1633). • Laboratories approved for Aqueous matrix may be utilized. Please note that the lab used does not have to be in North Carolina. Page 13 of 19 Permit NCO021717 A.(12.) ELECTRONIC REPORTING - DISCHARGE MONITORING REPORTS [G.S. 143-215.1 (b)] 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.) • Section D. (6.) • Section E. (5.) Reporting Records Retention 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:Hdeq.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. Monitoring results obtained during the previous month(s) shall be summarized for each month and reported via the eDMR system no later than the last calendar day of the month following the completed reporting period. 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. Starting on December 21, 2025, the permittee must electronically report the following compliance monitoring data and reports, when applicable: Sewer Overflow/Bypass Event Reports; and Pretreatment Program Annual Reports; and Clean Water Act (CWA) Section 316(b) Annual Reports. Page 14 of 19 Permit NC0021717 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. (I 1.)(a) or by a duly authorized representative of that person as described in Part II, Section B. (I 1.)(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 Page 15 of 19 Permit NC0021717 Certification. Any person submitting an electronic DMR using the state's eDMR system shall make the following certification [40 CFR 122.221. NO OTHER STATEMENTS OF CERTIFICATION WILL BE ACCEPTED: '7 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 ]. Page 16 of 19 Permit NCO021717 Lt Downstream, P Imo - A 4rr- 7 . OL�'f L Upstream . . . . . . . ...... 'Y Outfall a 1 N. X L 4 I j n.; v I V, xv OD I-' L I , _0 Q Latitude: Sub -Basin: 03-07-01 Facility Langitude 91'09'20 Location Quad# CANW, Wilkesbaro Stream Class: C Receivin Stream- Yadkin River Permitted Flow- 49 MG D, 66 MG D, & 80 Mr. D Town of Wilkesboro North Wilkesboro WRF Page 17 of 19 Permit NCO021717 Appendix A. PFAS Target Analytes EPA Method 1633 (EPA, January 2024) Target Analyte Name Abbreviation CAS Number Parameter Code Perfluoroalkyl carboxylic acids Perfluorobutanoic acid PFBA 375-22-4 51522 Perfluoropentanoic acid PFPeA 2706-90-3 51623 Perfluorohexanoic acid PFHxA 307-24-4 51624 Perfluoroheptanoic acid PFHpA 375-85-9 51625 Perfluorooctanoic acid PFOA 335-67-1 51521 Perfluorononanoic acid PFNA 375-95-1 51626 Perfluorodecanoic acid PFDA 335-76-2 51627 Perfluoroundecanoic acid PFUnA 2058-94-8 51628 Perfluorododecanoic acid PFDoA 307-55-1 51629 Perfluorotridecanoic acid PFTrDA 72629-94-8 51630 Perfluorotetradecanoic acid PFTeDA 376-06-7 51531 Perfluoroalkyl sulfonic acids Perfluorobutanesulfonic acid PFBS 375-73-5 52602 Perfluoropentanesulfonic acid PFPeS 2706-91-4 52610 Perfluorohexanesulfonic acid PFHxS 355-46-4 52605 Perfluoroheptanesulfonic acid PFHpS 375-92-8 52604 Perfluorooctanesulfonic acid PFOS 1763-23-1 52606 Perfluorononanesulfonic acid PFNS 68259-12-1 52611 Perfluorodecanesulfonic acid PFDS 335-77-3 52603 Perfluorododecanesulfonic acid PFDoS 79780-39-5 52632 Fluorotelomer sulfonic acids 1H,1H,2H,2H-Perfluorohexane sulfonic acid 4:2FTS 757124-72-4 52607 1H,1H,2H,2H-Perfluorooctane sulfonic acid 6:2FTS 27619-97-2 52608 1H,1H,2H,2H-Perfluorodecane sulfonic acid 8:2FTS 39108-34-4 52609 Perfluorooctane sulfonamides Perfluorooctanesulfonamide PFOSA 754-91-6 51525 N-methyl perfluorooctanesulfonamide NMeFOSA 31506-32-8 52641 N-ethyl perfluorooctanesulfonamide NEtFOSA 4151-50-2 52642 Table continues on next page. Page 18 of 19 Permit NCO021717 Table continued from Appendix A. PFAS Target Analytes EPA Method 1633 (EPA, January 2024). Target Analyte Name Abbreviation CAS Number Parameter Code Perfluorooctane sulfonamidoacetic acids N-methyl perfluorooctanesulfonamidoacetic acid NMeFOSAA 2355-31-9 51644 N-ethyl perfluorooctanesulfonamidoacetic acid NEtFOSAA 2991-50-6 51643 Perfluorooctane sulfonamide ethanols N-methyl perfluorooctanesulfonamidoethanol NMeFOSE 24448-09-7 51642 N-ethyl perfluorooctanesulfonamidoethanol NetFOSE 1691-99-2 51641 Per- and Polyfluorother carboxylic acids Hexafluoropropylene oxide dimer acid HFPO-DA 13252-13-6 52612 4,8-Dioxa-3H-perfluorononanoic acid ADONA 919005-14-4 52636 Perfluoro-3-methoxypropanoic acid PFMPA 377-73-1 PF002 Perlfuoro-4-methoxybutanoic acid PFMBA 863090-89-5 PF006 Nonafluoro-3,6-dioxaheptanoic acid NFDHA 151772-58-6 52626 Ether sulfonic acids 9-Chlorohexadecafluoro-3-oxanonane-l-sulfonic acid 9C1-PF3ONS 756426-58-1 PF003 11-Chloroeicosafluoro-3-oxaundecane-l-sulfonic acid 11C1-PF3OUdS 763051-92-9 PF004 Perfluoro(2-ethoxyethane)sulfonic acid PFEESA 113507-82-7 52629 Fluorotelomer carboxylic acids 3-Perfluoropropyl propanoic acid 3:3FTCA 356-02-5 PF001 2H,2H,3H,3H-Perfluorooctanoic acid 5:3FTCA 914637-49-3 PF007 3-Perfluoroheptyl propanoic acid 7:3FTCA 812-70-4 PF005 Page 19 of 19