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Home My WebLink AboutNC0050342_Fact Sheet_20230920A B C D E F I G I H I I I J K L M N O 1 P 1 NPDES/PT POC Review Form Version:2022.06.22 2 1. Facility's General Information 3 Date of (draft) Review 5/15/2023 c. POC review due to: e. Contact Information 4 Date of (final) Review Municipal NPDES renewal ❑s Regional Office (RO) Winston-Salem 5 NPDES Permit Writer (pw) Gary Perlmutter HWA-AT/LTMP Review ❑ RO PT Staff Jenny Graznak RO NPDES Staff Lon Snider Perm ittee-Facility Name City of Winston-Salem - Muddy Creek New Industries E]Facility PT Staff, email _F Joel Freeman <joelf .cityofws.org> 7 NPDES Permit Number NCO050342 WWTP expansion ❑ f. Receiving Stream 8 NPDES Permit Effective Date 12/1/2013 Stream reclass./adjustment ❑ Outfall 1 9 Chemical Addendum Submittal Date Outfall relocation/adjustment ❑ Receiving Stream: Yadkin River QA, cfs: 1849 10 NPDES Permit Public Notice Date 7Q10 update ❑ Stream Class WS-IV 7Q10 (S), cfs: 554 11 eDMR data evaluated from: to Other POC review trigger, explain: Oufall Lat. 35.55.51 N Outfall Long. 80.22.09 W 12 a. WWTP Capacity Summary Outfall II 13 Current Permitted Flow, mgd 21.0 Designed Flow, mgd L Receiving Stream: Muddy Creek QA, cfs: NA 14 Permitted SIU Flow, mgd 2.12 d. IU Summary Stream Class C 7Q10, cfs: NA 15 b. PT Docs. Summary # IUs Oufall Lat. 35.58.36 N Outfall Long. 80.22.59 16 IWS approval date 9/2/2016 # SIUs 8 Is there a PWS downstream of the Facility's Outfalls? 0 YES ❑ NO 17 L/STMP approval date: 3/5/2019 # CIUs 2 Comments: 18 HWA approval date 2/28//2018 # NSCIUs 19 # IUs w/Local Permits or Other ITypes 20 2. Industrial Users' Information. 21 L # Industrial User (IU) Name IU Activity IU Non Conventional Pollutans & Toxic Pollutant IUP Effective Date 22 L 1 Ardagh Metal Packaging USA, Corp. 40 CFR 465 Flow, Cr, Cu, F, Mn, TP, Zn,CN,HOG, TTO, pH 7/1/2022 23 2 Crothall Laundry Laundry Flow, pH 7/1/2022 24 E a 3 Grass America, Inc. 40 CFR 433 Flow, Cd, Cr, Pb, Ni, Ag, Zn, CN, TTO, pH 7/1/2022 25 W 4 Herbalife Nutrition (HIMWS) Food Suppl. Flow, BOD, TSS, pH 7/1/2022 26 a 5 Ingredion, Inc. Corn Milling Flow, BOD, TSS, Zn, pH 7/1/2022 27 Z 6 John Deere Kernersville, LLC 40 CFR 433 Flow, Cd, Cr, Cu, Pb, Ni, Ag, Zn, CN, TTO, pH 7/1/222 28 7 Lantal Textiles, Inc. Textiles Flow, BOD, TSS, pH 7/1/2022 29 8 Liquid Environmental Solutions (LES) 40 CFR 403 Flow, BOD, TSS, FOG, pH 7/1/2022 30 9 Progress Rail 40 CFR 433 Flow, Cd, Cr, Cu, Pb, Ni, Ag, Zn, CN, TTO, pH 7/1/2022 31 10 R.J. Reynolds Company Tobaccoville Tobacco Flow, BOD, TSS, Zn, pH 7/1/2022 32 11 R.J. Reynolds Company Whitaker Park Tobacco Flow, BOD, TSS, Zn, pH 7/1/2022 33 12 Siemens Energy 40 CFR 433 Flow, Cd, Cr, Cu, Pb, Ni, Ag, Zn, CN, TTO, pH 7/1/2022 34 13 Superior Manufacturing Company 40 CFR 433 Flow, Cd, Cr, Cu, Pb, Ni, Ag, Zn, CN, TTO, pH 7/1/2022 35 14 TexTech Coatings, LLC Coatings Flow, EPA 624, pH 7/1/2022 36 15 UniFirst Corp. Laundry Flow, BOD, Cd, Cu, Pb, Zn, pH 7/1/2022 37 16 Westrock CP, LLC Manufacturing Flow, BOD, TSS, Cu, Zn, CN, pH 7/1/2022 38 17 Westrock Merchandizing Displays Manufacturing Flow, BOD, TSS, pH 7/1/2022 39 40 Comment: The following IUs are shared with Archie Elledge WWTP: Ardagh, Grass America, Herbalife, Ingredion, John Deere, LES, Progress Rail, TexTech, UniFirst, 41 3. Status of Pretreatment Program (check all that apply) 42 Status of Pretreatment Program (check all that apply) 43 ❑ 1) facility has no SIUs, does have Division approved Pretreatment Program that is INACTIVE 2) facility has no SIU's, does not have Division approved Pretreatment Program 3) facility has SIUs and DWQ approved Pretreatment Program 3a) Full Program with LTMP 3b) Modified Program with STMP 4) additional conditions regarding Pretreatment attached or listed below 5) facility's sludge is being land applied or composted 6) facility's sludge is incinerated (add Beryllium and Mercury sampling according to § 503.43) 44 ❑ 45 ❑ 46 p 47 ❑ 48 ❑ 49 p 50 ❑ 51 ❑ 7) facility's sludge is taken to a landfill, if yes which landfill: 52 ❑ 8) other 53 Sludge Disposal Plan: Sludge is anaerobically digested then pumped 5.2 miles to two blending tanks at Archie Elledge WWTP. At Archie Elledge WWTP the sludge is blended with the latter WWTP's sludge, then centrifuged to create pellets which are then land applied as Class A biosolids under permit number WQ0029804 or disposed of by other approved methods. 54 55 56 Sludge Permit No: WQ0029804 Page 1 50342 POC Review Form 2023 AlB I C D I E I F I G I H I I I J I K I L I M I N 1 O 1 P 57 4. LTMP/STMP and HWA Review 58 PW: Find L/STMP document, HWA spreadsheet, DMR, previous and new NPDES permit for next section. 59 a �Comment J c tU a Parameter of Concern (POC) Check List New NPDES POC Previous NPDES POC Required by EPA PT(1) POC due to Sludge (2) POC due to SIU (3) POTW POC (4) a /o Removal Rate L/STMP Effluent Freq NPDES Effluent Freq PQLs review 60 PQL from L/STMP, ug/I Required PQL per NPDES permit Recomm. PQL, ug/I 61 0 Flow ❑ 0 0 ❑ 62 p BOD p p ❑ 2 mg/L 63 ❑' TSS ❑ ❑r ❑r ❑ 2 mg/L 64 0 NH3 ❑ 0 0 ❑ 100.0 65 0 Arsenic ❑ ❑ 0 0 ❑ 5.0 2. Reduce to recommended level 66 ❑ Barium ❑ ❑ ❑ ❑ ❑ 67 ❑ Beryllium(5) ❑ ❑ ❑ ❑ ❑ 68 p Cadmium(1) ❑ ❑ ❑� 0 0 ❑ 2.0 Reduce to recommended level 69 p Chromium(1) ❑ ❑ p p p ❑ 5.0 70 p Copper(1) ❑ ❑ p p p ❑ 2.0 2.0 71 0 Cyanide ❑ ❑ p p ❑ 5.0 72 0 Lead(1) ❑ ❑ ❑2 0 ❑ 10.0 2.0 Reduce to recommended level 73 0 Mercury(5) ❑ ❑ 0 p ❑ 0.001 0.001 74 0 Molybdenum ❑ ❑ 0 0 ❑ 5.0 10.0 75 0 Nickel(l) ❑ ❑ ❑ ❑✓ 1Z ❑ 10.0 5.0 Reduce to recommended level 76 0 Selenium ❑ ❑ 0 0 ❑ 10.0 77 p Silver ❑ ❑ 0 p ❑ 1.0 0 78 0 Zinc(1) ❑ ❑ ❑ 0 0 ❑ 10.0 79 ❑ Sludge Flow to Disposal ❑ ❑ ❑ 80 ❑ % Solids to Disposal ❑ ❑ ❑ 81 ❑ Oil & Grease ❑ ❑ 82 p TN ❑ p ❑ ❑ 100.0 83 0 TP ❑ 0 X ❑ ❑ 10.0 84 p TKN ❑ ❑ X p ❑ 100.0 85 p 1,4-Dioxane El ❑ ❑ Recommend adding parameter to LTMP 86 0 PFAS 0 ❑ ❑ ❑ Recommend adding parameter to LTMP 87 ❑ ❑ ❑ ❑ ❑ 88 ❑ ❑ ❑ ❑ ❑ 89 ❑ ❑ ❑ ❑ ❑ 90 ❑ ❑ ❑ ❑ ❑ 91 Footnotes: (1) Always in the LTMP/STMP due to EPA -PT requirement (2) Only in LTMP/STMP if listed in sludge permit (3) Only in LTMP/STMP while SIU still discharges to POTW (4) Only in LTMP/STMP when pollutant is still of concern to POTW (5) In LTMP/STMP, if sewage sludge is incinerated Please use blue font for the info updated by pw Please use red font for POC that need to be added/modified in L/STMP sampling plan .....,... a f^nf —4 c+r;k , Blue shaded cell (D60:1-182): Parameters usually included under that POC list 92 93 94 95 96 97 98 99 100 101 5. Comments 102 Facility Summary/background information/NPDES-PT regulatory action: POC to be added/modified in L/STMP: 103 ORC's comments on IU/POC: 104 POC submitted through Chemical Addendum or Supplemental Chemical Datasheet: 105 Additional pollutants added to L/STMP due to POTWs concerns: 106 NPDES pw's comments on IU/POC: 107 6. Pretreatment updates in response to NPDES permit renewal 108 NPDES Permit Effective Date 1180 days after effective (date): 7Permit writer, please add list of required/recommended PT updates in NPDES permit cover letter. Page 2 50342 POC Review Form 2023 DocuSign Envelope ID: ED25EFBO-6368-41 E5-9EA9-60194135C8295 ROY COOPER Governor ELIZABETH BISER Secretary S. DANIEL SMITH Director NORTH CAROLINA Environmental Quality 7/1/2021 CERTIFIED MAIL 7018 1830 0001 8037 1806 RETURN RECEIPT REQUESTED City of Winston-Salem David K. Saunders, P.E., Director of Utilities Public Works Department Winston-Salem, North Carolina 27102 Subject: Imposition of Sewer Line Moratorium Demonstration of Future Wastewater Treatment Capacities NPDES Permit NCO050342 City of Winston-Salem, Muddy Creek WWTP, WPCS Grade V Forsyth County Dear Permittee: 15A NCAC 02T .0118, "Demonstration of Future Wastewater Treatment Capacities," was adopted by the Environmental Management Commission to ensure that wastewater treatment systems owned or operated by municipalities, counties, sanitary districts, or public utilities do not exceed their hydraulic treatment capacities. This Rule specifies that no permits for sewer line extensions will be issued by the Division of Water Resources to facilities exceeding 80% of their hydraulic treatment capacity unless specific evaluations of future wastewater treatment needs have been completed. A review of your self -monitoring reports has indicated flow at the subject facility is at or exceeding the 80% threshold for the period Jan2020 through May2021. The average flow calculated for this period was 16.79 MGD representing 80% of your current treatment capacity. Therefore, we will be unable to approve any further sewer line extensions for this facility until such time as you have complied with the requirements contained in the Rule. To attain compliance with the Rule, you must submit an approvable engineering evaluation of future wastewater treatment needs. This evaluation must outline specific plans for system expansion and include the sources of funding for the expansion. If future expansion is not proposed, a detailed justification must be made based on past growth records and future growth projections and as appropriate, shall include conservation plans or other specific measures to achieve waste flow reductions. To prevent delays in the processing of your future permit applications for sewer line extensions, please submit a plan of action containing the information necessary to comply with the appropriate demonstrations as described above to the following address: North Carolina Department of Environmental Quality I Division of Water Resources ,f� 512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617 — '�� 919.707.3616 DocuSign Envelope ID: ED25EFB0-6368-41E5-9EA9-60194B5C8295 DEQ-DWR Compliance & Expedited Permitting Unit 1617 Mail Service Center Raleigh, North Carolina 27699-1617 Provision For Sewer Line Approvals While On Moratorium Per the terms of NCAC 02T .0118 (3), the Director may, on a case -by -case basis, allow permits to be issued to facilities exceeding the 80 percent loading rate if: 1) additional flow will not cause the facility to exceed its permitted hydraulic capacity, 2) the facility has complied with all other permit limitations and requirements, and 3) the Permiee demonstrates adequate progress to develop the required engineering evaluations and/or plans and specifications. If you wish to obtain sewer extension permits while under moratorium per this provision of the rule, please send all required information in support of your request to the Winston-Salem Regional Office (WSRO). Any plans and specifications for expansion should be submitted to the Division of Water Resources. Notification of 90% Hydraulic Treatment Capacity Requirements To attain compliance with the Rule, prior to reaching the 90% hydraulic treatment capacity threshold, you must obtain all permits needed for expansion of the wastewater treatment system and, if construction is needed, submit approvable final plans and specifications for expansion of the wastewater treatment system, including a construction schedule. If expansion is not proposed or is proposed for a later date, a detailed justification must be made and approved by the Director based on past growth records and future growth projections and as appropriate, shall include conservation plans or other specific measures to achieve waste flow reductions. We look forward to working with you on development of plans to meet your future wastewater treatment needs. If you have any questions regarding this matter, please contact the Water Quality Regional Operations staff of our Winston-Salem Regional Office at 336-776-9800 or email Joe R. Corporon of the Compliance & Expedited Permitting Unit D oe. corporon@ncdenr. gov] . Sincerely, DocuSigned by: ✓TJ�x C 1. 832044CE9EB4A1... for S. Daniel Smith, Director Division of Water Resources Attachment (15A NCAC 02T .0118) cc: Laserfiche Winston-Salem Regional Office Municipal Permitting Unit DocuSign Envelope ID: ED25EFBO-6368-41 E5-9EA9-60194B5C8295 15A NCAC 02T .0118 DEMONSTRATION OF FUTURE WASTEWATER TREATMENT CAPACITIES To ensure treatment, utilization, or disposal systems do not exceed their hydraulic treatment capacities, no permits for sewer line extensions shall be issued to wastewater treatment systems owned or operated by municipalities, counties, sanitary districts or public utilities unless they meet the following requirements: 1) Prior to exceeding 80 percent of the wastewater treatment system's permitted hydraulic capacity (based on the average flow of the last calendar year), the permittee must submit an approvable engineering evaluation of their future wastewater treatment, utilization, and disposal needs. This evaluation must outline specific plans for meeting future wastewater treatment, utilization, or disposal needs by either expansion of the existing system, elimination or reduction of extraneous flows, or water conservation and must include the source(s) of funding for the improvements. If expansion is not proposed or is proposed for a later date, a detailed justification must be made to the satisfaction of the Director that wastewater treatment needs will be met based on past growth records and future growth projections and, as appropriate, shall include conservation plans or other specific measures to achieve waste flow reductions. 2) Prior to exceeding 90 percent of the wastewater treatment, utilization, or disposal systems permitted hydraulic capacity, (based on the last calendar year), the permittee must obtain all permits needed for the expansion of the wastewater treatment, utilization, or disposal system and, if construction is needed, submit approvable final plans and specifications for expansion including a construction schedule. If expansion is not proposed or is proposed for a later date, a detailed justification must be made to the satisfaction of the Director that wastewater treatment needs will be met based on past growth records and future growth projections and, as appropriate, shall include conservation plans or other specific measures to achieve waste flow reductions. 3) The Director shall allow permits to be issued to facilities that are exceeding the 80 percent or 90 percent loading rates if the additional flow is not projected to result in the facility exceeding its permitted hydraulic capacity, the facility is in compliance with all other permit limitations and requirements, and it is demonstrated to the satisfaction of the Director that adequate progress is being made in developing the needed engineering evaluations or plans and specifications. In determining the adequacy of the progress, the Director shall consider the projected flows, the complexity and scope of the work to be completed and any projected environmental impacts. History Note: Authority G.S. 143-215.3; Efj`.' September 1, 2006 �- '.) I - -.. , - r .. I 0 ID L. � 16' rl DocuSign Envelope ID: CB44EF54-BEF5-4F1 1-916B-D4E602AD1 396 ROY COOPER Governor ELIZABETH BISER Secretary S. DANIEL SMITH Director NORTH CAROLINA EnWrtdfimerrtal Qrlalrfy 8/27/2021 CERTIFIED MAIL 7018 1830 0001 8037 1844 RETURN RECEIPT REQUESTED City of Winston-Salem Courtney Driver, P.E., Utilities Director Winston-Salem/Forsyth County Utilities Winston-Salem, North Carolina 27102 Subject: Retraction of Sewer Line Moratorium Demonstration of Future Wastewater Treatment Capacities NPDES Permit NCO050342 Muddy Creek WWTP, Biological WPCS Grade V Forsyth County Mr. Driver: On July 1, 2021, the Division issued a sewer -line moratorium against the Winston-Salem/Forsyth County Utilities, Muddy Creek WWTP, based on our review of your self -monitoring reports. Your report period January 2020 through December 2020 indicated that your current treatment flow capacity for that time period exceeded or met its 80% threshold. Based on recent email correspondence with WRSO staff and further review of your letter to the Division dated May 12, 2021, Winston-Salem/Forsyth County Utilities has now met its requirements under 15A NCAC 02T.0118, Demonstration of Future Wastewater Treatment Capacities. Therefore, the Division hereby lifts the sewer line moratorium imposed against the subject Muddy Creek WWTP. Please note that future moratoriums may still be imposed for exceeding a 90% threshold of the current treatment capacity, or if Muddy Creek WWTP demonstrates an inability to sufficiently treat the volume of wastewater entering the facility. Thank you for your prompt attention to this matter. If you have questions about this letter or discharge monitoring reports, please contact Jenny Graznak (WSRO) or Joe Corporon of my staff via e-mail at D o e. corporon@nc denr. gov] . Sincerely, EDocuSigned by: 8644CE9EB4A1... for S. Daniel Smith, Director Division of Water Resources North Carolina Department of Environmental Quality cc: Laserfiche Winston-Salem Regional Office Municipal Permitting Unit MONITORING REPORT(MR) VIOLATIONS for: Report Date: 05/18/22 Page 1 of 3 Permit: NCO050342 MRS Betweei 3 - 2018 and 5 - 2023 Region: % Violation Category:% Program Category: Facility Name: % Param Nam(% County: % Subbasin: % Violation Action: % Major Minor: % PERMIT: NCO050342 FACILITY: City of Winston-Salem - Muddy Creek WWTP COUNTY: Forsyth REGION: Winston-Salem Limit Violation MONITORING VIOLATION UNIT OF CALCULATED % REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION 10 - 2021 001 Effluent BOD, Carbonaceous 05 Day, 10/02/21 2 X week mg/I 40 46 15.0 Weekly Average Proceed to NOD 20 C Exceeded 07 - 2022 001 Effluent BOD, Carbonaceous 05 Day, 07/09/22 2 X week mg/I 40 65 62.5 Weekly Average No Action, BPJ 20 C Exceeded 07 - 2022 001 Effluent BOD, Carbonaceous 05 Day, 07/23/22 2 X week mg/I 40 66.25 65.6 Weekly Average No Action, BPJ 20 C Exceeded 07 - 2022 001 Effluent BOD, Carbonaceous 05 Day, 07/31/22 2 X week mg/I 25 43.81 75.3 Monthly Average No Action, BPJ 20 C Exceeded 07 - 2018 001 Effluent Chlorine, Total Residual 07/25/18 5 X week ug/I 28 38 35.7 Daily Maximum No Action, BPJ Exceeded 04 - 2020 001 Effluent Chlorine, Total Residual 04/02/20 5 X week ug/I 28 46 64.3 Daily Maximum No Action, BPJ Exceeded 04 - 2020 001 Effluent Chlorine, Total Residual 04/09/20 5 X week ug/I 28 39 39.3 Daily Maximum No Action, BPJ Exceeded 07 - 2020 001 Effluent Chlorine, Total Residual 07/16/20 5 X week ug/I 28 32 14.3 Daily Maximum No Action, BPJ Exceeded 12 - 2021 001 Effluent Chlorine, Total Residual 12/17/21 5 X week ug/I 28 45 60.7 Daily Maximum No Action, BPJ Exceeded 12 - 2018 001 Effluent Flow, in conduit or thru 12/31/18 Continuous mgd 21 21.62 2.9 Monthly Average No Action, BPJ treatment plant Exceeded 02 - 2020 001 Effluent Flow, in conduit or thru 02/29/20 Continuous mgd 21 21.54 2.6 Monthly Average No Action, BPJ treatment plant Exceeded 06-2018 001 Effluent pH 06/01/18 5Xweek su 6 5.9 1.7 Daily Minimum Not No Action, BPJ Reached 10-2018 001 Effluent pH 10/22/18 5 X week su 6 5.5 8.3 Daily Minimum Not Proceed to NOD Reached 10-2018 001 Effluent pH 10/30/18 5 X week su 6 5.1 15.0 Daily Minimum Not Proceed to NOD Reached 10-2020 001 Effluent Solids, Total Suspended - 10/31/20 2 X week mg/I 45 145.4 223.1 Weekly Average Proceed to NOV Concentration Exceeded MONITORING REPORT(MR) VIOLATIONS for: Report Date: 05/18/2� Page 2 of 3 Permit: NCO050342 MRS Betweel 3 - 2018 and 5 - 2023 Region: % Violation Category:% Program Category: % Facility Name: % Param Nam(% County: % Subbasin: % Violation Action: % Major Minor: % PERMIT: NCO050342 FACILITY: City of Winston-Salem - Muddy Creek WWTP COUNTY: Forsyth REGION: Winston-Salem Limit Violation MONITORING VIOLATION UNIT OF CALCULATED % REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION 10 -2020 001 Effluent Solids, Total Suspended - 10/31/20 2 X week mg/I 30 46.14 53.8 Monthly Average Proceed to NOV Concentration Exceeded 07 - 2022 001 Effluent Solids, Total Suspended - 07/02/22 2 X week mg/I 45 53.8 19.6 Weekly Average No Action, BPJ Concentration Exceeded Monitoring Violation MONITORING VIOLATION UNIT OF CALCULATED % REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION 08 -2018 001 Effluent Chlorine, Total Residual 08/04/18 5 X week ug/I Frequency Violation No Action, BPJ 09 - 2018 001 Effluent Chlorine, Total Residual 09/22/18 5 X week ug/I Frequency Violation No Action, BPJ 10 - 2018 001 Effluent Chlorine, Total Residual 10/13/18 5 X week ug/I Frequency Violation No Action, BPJ 11 -2018 001 Effluent Chlorine, Total Residual 11/17/18 5 X week ug/I Frequency Violation No Action, BPJ 12 - 2018 001 Effluent Chlorine, Total Residual 12/15/18 5 X week ug/I Frequency Violation No Action, BPJ 12 - 2018 001 Effluent Chlorine, Total Residual 12/22/18 5 X week ug/I Frequency Violation No Action, BPJ 02 - 2020 001 Effluent Chlorine, Total Residual 02/08/20 5 X week ug/I Frequency Violation No Action, BPJ 05 - 2020 001 Effluent Chlorine, Total Residual 05/23/20 5 X week ug/I Frequency Violation No Action, BPJ 01 -2022 001 Effluent Chlorine, Total Residual 01/22/22 5 X week ug/I Frequency Violation Proceed to NOD 04 - 2022 001 Effluent Chlorine, Total Residual 04/16/22 5 X week ug/I Frequency Violation No Action, BPJ 08 - 2018 001 Effluent Conductivity 08/04/18 5 X week umhos/cm Frequency Violation No Action, BPJ 09 - 2018 001 Effluent Conductivity 09/22/18 5 X week umhos/cm Frequency Violation No Action, BPJ 10 - 2018 001 Effluent Conductivity 10/13/18 5 X week umhos/cm Frequency Violation No Action, BPJ 11 -2018 001 Effluent Conductivity 11/17/18 5 X week umhos/cm Frequency Violation No Action, BPJ 12 - 2018 001 Effluent Conductivity 12/15/18 5 X week umhos/cm Frequency Violation No Action, BPJ MONITORING REPORT(MR) VIOLATIONS for: Report Date: 05/18/2� Page 3 of 3 Permit: NCO050342 MRS Betweel 3 - 2018 and 5 - 2023 Region: % Violation Category:% Program Category: % Facility Name: % Param Nam(% County: % Subbasin: % Violation Action: % Major Minor: % PERMIT: NCO050342 FACILITY: City of Winston-Salem - Muddy Creek WWTP COUNTY: Forsyth REGION: Winston-Salem Monitoring Violation MONITORING VIOLATION UNIT OF CALCULATED % REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION 12 - 2018 001 Effluent Conductivity 12/22/18 5 X week umhos/cm Frequency Violation No Action, BPJ 12 - 2018 001 Effluent Conductivity 12/29/18 5 X week umhos/cm Frequency Violation No Action, BPJ 02 - 2020 001 Effluent Conductivity 02/08/20 5 X week umhos/cm Frequency Violation No Action, BPJ 05 - 2020 001 Effluent Conductivity 05/23/20 5 X week umhos/cm Frequency Violation No Action, BPJ 01 -2022 001 Effluent Conductivity 01/22/22 5 X week umhos/cm Frequency Violation Proceed to NOD 04 - 2022 001 Effluent Conductivity 04/16/22 5 X week umhos/cm Frequency Violation No Action, BPJ 08 - 2018 001 Effluent pH 08/04/18 5 X week su Frequency Violation No Action, BPJ 09 - 2018 001 Effluent pH 09/22/18 5 X week su Frequency Violation No Action, BPJ 10 - 2018 001 Effluent pH 10/13/18 5 X week su Frequency Violation No Action, BPJ 11 -2018 001 Effluent pH 11/17/18 5 X week su Frequency Violation No Action, BPJ 12 - 2018 001 Effluent pH 12/15/18 5 X week su Frequency Violation No Action, BPJ 12 - 2018 001 Effluent pH 12/22/18 5 X week su Frequency Violation No Action, BPJ 02 - 2020 001 Effluent pH 02/08/20 5 X week su Frequency Violation No Action, BPJ 05 - 2020 001 Effluent pH 05/23/20 5 X week su Frequency Violation No Action, BPJ 01 -2022 001 Effluent pH 01/22/22 5 X week su Frequency Violation Proceed to NOD 04 - 2022 001 Effluent pH 04/16/22 5 X week su Frequency Violation No Action, BPJ Whole Effluent Toxicity Testing and Self Monitoring Summary Winston-Salem Archie Elledge WWTP NCO037834/001 County: Forsyth Region: WSRO Basin: YAD04 Jan Apr Jul Oct Ceri7dPF Begin: 8/1/2017 chr lim: 76% NonComp: ChV Avg 7Q10: 15.0 PF: 30 IWC: 75.6 Freq: Q J F M A M J J A S O 2019 Pass - - Pass - - Pass - - Pass 2020 Pass - - Pass - - Pass - - Pass >96% (P) 2021 Pass - - Pass - - Pass - - Pass 2022 Pass - - Pass - - Pass - - Pass 2023 Pass - - Pass - - - - - - Winston-Salem Lower Muddy Crk NCO050342/001 County: Forsyth Region: WSRO Basin: YAD04 Jan Apr Jul Oct Ceri7dPF Begin: 9/1/2017 chr lim: 5.5% NonComp: ChV Avg 70,10: 554.0 PF: 21.0 IWC: 5.5 Freq: Q J F M A M J J A S O 2019 Pass - - Pass - - Pass >22(P) - - Pass 2020 Pass - - Pass - - Pass - - Pass >22(P) 2021 Pass - - Pass - - Pass - - Pass 2022 Pass - - Pass - - Pass - - Pass 2023 Pass - - Pass - - - - - - Woodfin Sanitary WTP (NCG590012) NCO083178/001 County: Buncombe Ceri7dPF Begin: 7/1/2016 ANNUAL (NCG59001 NonComp: Single J F M A M 2019 - - - - Pass 2020 2021 - - - - Pass 2022 - - - - Pass 2023 - - - - Pass Woodlake Yacht Club (Aqua) NCO061719/001 County: Moore Ceri7dPF Begin: 8/1/2016 2.8% (0.3 MGD), 4.6 NonComp: J F M A M 2019 - Pass - - Pass 2020 - - Pass - Pass 2021 - Pass - - Pass 2022 - Pass - - Pass 2023 - Pass - - - Worsley Co./Dixie Boy Truck/003 NCO065307/003 County: New Hanover Fthd24PF Begin: 8/1/2014 Ac P/F Monit: 90% Ft NonComp: J F M A M 2019 Fail - - Pass - 2020 Fail - - Fail - 2021 Fail - - Fail - 2022 Fail - - Fail - 2023 Fail - - Fail - SOC JOC: N >96 (P) SOC JOC: N >22 (P) Region: ARO Basin: FRB02 Mar Jun Sep Dec SOC JOC: 7Q10: 0.61 PF: .0337 IWC: 8.0 Freq: A J J A S O N Pass Region: FRO Basin: CPF14 Feb May Aug Nov SOC JOC: 7Q10: 16 PF: 0.5 IWC: 8.82 Freq: Q J J A S O N - - Pass - - Pass - - Pass - - Pass - - Pass - - Pass - - Pass - - Pass Region: WIRO Basin: CPF17 Jan Apr Jul Oct SOC JOC: 7Q10: 26.3 PF: - IWC: NA Freq: Q J J A S O N - Fail - - Fail - - Fail Pass - Fail - - Fail - - Fail - - Fail - - Fail - C C G C C Leeend: P= Fathead minnow (Pimohales oromelas). H=No Flow (facilitv is active). s = Split test between Certified Labs Page 114 of 115 United States Environmental Protection Agency Form Approved. EPA Washington, D.C. 20460 OMB No. 2040-0057 Water Compliance Inspection Report Approval expires 8-31-98 Section A: National Data System Coding (i.e., PCS) Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type 1 IN 1 2 u 3 I NC0050342 111 121 21/07/30 I17 18 LC] I 19 I s I 20L] 21111I I I I I I I II I I I I I I I I I I I I I I I I I I I I I I I II I I I I I r6 Inspection Work Days Facility Self -Monitoring Evaluation Rating B1 QA ---------------------- Reserved ------------------- 67 I 72 I n, I 71 I 74 79 I I I I I I I80 701 I 71 I LL -1 I I LJ Section B: Facility Data Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include Entry Time/Date Permit Effective Date POTW name and NPDES permit Number) 09:OOAM 21/07/30 17/09/01 Muddy Creek WWTP 4561 Cooper Rd Exit Time/Date Permit Expiration Date Winston Salem NC 27102 12:30PM 21/07/30 22/06/30 Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s) Other Facility Data Ozie Keith Jones/ORC/336-397-7679/ Name, Address of Responsible Official/Title/Phone and Fax Number Contacted Ozie K Jones,4561 Cooper Rd Winston Salem NC 27127//336-397-7679/3363977667 No Section C: Areas Evaluated During Inspection (Check only those areas evaluated) Permit 0 Flow Measurement Operations & Maintenar 0 Records/Reports Sludge Handling Dispo: 0 Facility Site Review Effluent/Receiving Wate Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) (See attachment summary) Name(s) and Signature(s) of Inspector(s) Agency/Office/Phone and Fax Numbers Date Gary Hudson DWR/Division of Water Qua Iity/336-776-9694/ Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete. Page# NPDES yr/mo/day Inspection Type NCO050342 I11 12I 21/07/30 117 18 i c i (Cont.) Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) *The current permit became effective September 1, 2017, and will expire June 30, 2022. The WWTP staff are currently in the process of completing the permit renewal application. *The WWTP appeared to be very well operated and maintained. The WWTP staff uses a target mean cell residence time (MCRT) to adjust sludge wasting rates, which varies between summer and winter months. At the time of the inspection the MCRT target was 11 days. *WWTP staff as well as the laboratory staff do a very good job of keeping records of all plant data. *The aeration basins appeared clean and very well maintained. *All of the secondary clarifiers were clean and well maintained. *The effluent flow meter is calibrated every month by city maintenance personnel. Page# Permit: NCO050342 Owner -Facility: Muddy Creek WWTP Inspection Date: 07/30/2021 Inspection Type: Compliance Evaluation Permit Yes No NA NE (If the present permit expires in 6 months or less). Has the permittee submitted a new ❑ ❑ ■ ❑ application? Is the facility as described in the permit? ■ ❑ ❑ ❑ # Are there any special conditions for the permit? ❑ ■ ❑ ❑ Is access to the plant site restricted to the general public? ■ ❑ ❑ ❑ Is the inspector granted access to all areas for inspection? ■ ❑ ❑ ❑ Comment: The current permit became effective September 1, 2017, and will expire June 30, 2022. The WWTP staff are currently in the process of completing the permit renewal application. Operations & Maintenance Yes No NA NE Is the plant generally clean with acceptable housekeeping? ■ ❑ ❑ ❑ Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable ■ ❑ ❑ ❑ Solids, pH, DO, Sludge Judge, and other that are applicable? Comment: The WWTP appeared to be very well operated and maintained. The WWTP staff uses a target mean cell residence time (MCRT) to adjust sludge wasting rates, which varies between summer and winter months. At the time of the inspection the MCRT target was 11 days. Record Keeping Yes No NA NE Are records kept and maintained as required by the permit? ■ ❑ ❑ ❑ Is all required information readily available, complete and current? ■ ❑ ❑ ❑ Are all records maintained for 3 years (lab. reg. required 5 years)? ■ ❑ ❑ ❑ Are analytical results consistent with data reported on DMRs? ■ ❑ ❑ ❑ Is the chain -of -custody complete? ■ ❑ ❑ ❑ Dates, times and location of sampling ■ Name of individual performing the sampling ■ Results of analysis and calibration ■ Dates of analysis ■ Name of person performing analyses ■ Transported COCs ■ Are DMRs complete: do they include all permit parameters? ■ ❑ ❑ ❑ Has the facility submitted its annual compliance report to users and DWQ? ■ ❑ ❑ ❑ (If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified ■ ❑ ❑ ❑ operator on each shift? Is the ORC visitation log available and current? ■ ❑ ❑ ❑ Page# 3 Permit: NCO050342 Owner -Facility: Muddy Creek WWTP Inspection Date: 07/30/2021 Inspection Type: Compliance Evaluation Record Keeping Yes No NA NE Is the ORC certified at grade equal to or higher than the facility classification? ■ ❑ ❑ ❑ Is the backup operator certified at one grade less or greater than the facility ■ ❑ ❑ ❑ classification? Is a copy of the current NPDES permit available on site? ■ ❑ ❑ ❑ Facility has copy of previous year's Annual Report on file for review? ■ ❑ ❑ ❑ Comment: WWTP staff as well as the laboratory staff do a very good job of keeping records of all plant data. Bar Screens Yes No NA NE Type of bar screen a.Manual ❑ b.Mechanical ■ Are the bars adequately screening debris? ■ ❑ ❑ ❑ Is the screen free of excessive debris? ■ ❑ ❑ ❑ Is disposal of screening in compliance? ■ ❑ ❑ ❑ Is the unit in good condition? ■ ❑ ❑ ❑ Comment: Aeration Basins Yes No NA NE Mode of operation Ext. Air Type of aeration system Diffused Is the basin free of dead spots? ■ ❑ ❑ ❑ Are surface aerators and mixers operational? ❑ ❑ ■ ❑ Are the diffusers operational? ■ ❑ ❑ ❑ Is the foam the proper color for the treatment process? ■ ❑ ❑ ❑ Does the foam cover less than 25% of the basin's surface? ■ ❑ ❑ ❑ Is the DO level acceptable? ❑ ❑ ❑ ■ Is the DO level acceptable?(1.0 to 3.0 mg/1) ❑ ❑ ❑ ■ Comment: The aeration basins appeared clean and very well maintained. Secondary Clarifier Yes No NA NE Is the clarifier free of black and odorous wastewater? ■ ❑ ❑ ❑ Is the site free of excessive buildup of solids in center well of circular clarifier? ■ ❑ ❑ ❑ Are weirs level? ■ ❑ ❑ ❑ Page# 4 Permit: NC0050342 Inspection Date: 07/30/2021 Secondary Clarifier Is the site free of weir blockage? Is the site free of evidence of short-circuiting? Is scum removal adequate? Is the site free of excessive floating sludge? Is the drive unit operational? Owner -Facility: Muddy Creek WWTP Inspection Type: Compliance Evaluation Is the return rate acceptable (low turbulence)? Is the overflow clear of excessive solids/pin floc? Is the sludge blanket level acceptable? (Approximately'/4 of the sidewall depth) Comment: All of the secondary clarifiers were clean and well maintained. Disinfection -Liquid Is there adequate reserve supply of disinfectant? (Sodium Hypochlorite) Is pump feed system operational? Is bulk storage tank containment area adequate? (free of leaks/open drains) Is the level of chlorine residual acceptable? Is the contact chamber free of growth, or sludge buildup? Is there chlorine residual prior to de -chlorination? Comment: De -chlorination Type of system ? Is the feed ratio proportional to chlorine amount (1 to 1)? Is storage appropriate for cylinders? # Is de -chlorination substance stored away from chlorine containers? Comment: Are the tablets the proper size and type? Are tablet de -chlorinators operational? Number of tubes in use? Comment: Flow Measurement - Effluent # Is flow meter used for reporting? Is flow meter calibrated annually? Yes No NA NE • ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ ❑ ❑ ❑ ■ Yes No NA NE • ❑ ❑ ❑ • ❑ ❑ ❑ ■ ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ Yes No NA NE Liquid ■ ❑ ❑ ❑ ❑ ❑ ■ ❑ ■ ❑ ❑ ❑ ❑ ❑ ■ ❑ ❑ ❑ ■ ❑ Yes No NA NE • ❑ ❑ ❑ • ❑ ❑ ❑ Page# 5 Permit: NC0050342 Owner -Facility: Muddy Creek WWTP Inspection Date: 07/30/2021 Inspection Type: Compliance Evaluation Flow Measurement - Effluent Yes No NA NE Is the flow meter operational? 0 ❑ ❑ ❑ (If units are separated) Does the chart recorder match the flow meter? 0 ❑ ❑ ❑ Comment: The effluent flow meter is calibrated every month by city maintenance personnel. Anaerobic Digester Type of operation: Is the capacity adequate? # Is gas stored on site? Is the digester(s) free of tilting covers? Is the gas burner operational? Is the digester heated? Is the temperature maintained constantly? Is tankage available for properly waste sludge? Comment: Yes No NA NE Floating cover ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ ■ ❑ ❑ ❑ Page# 6 NH3/TRC WLA Calculations Muddy Creek WWTP Permit No. NC0050342 Prepared By: Gary Perlmutter Enter Design Flow (MGD): 21 Enter s7Q10 (cfs): 554 Enter w7Q10 (cfs): 854 Total Residual Chlorine (TRC) Ammonia (Summer) Daily Maximum Limit (ug/1) Monthly Average Limit (mg NH3-N/1) s7Q10 (CFS) 554 s7Q10 (CFS) 554 DESIGN FLOW (MGD) 21 DESIGN FLOW (MGD) 21 DESIGN FLOW (CFS) 32.55 DESIGN FLOW (CFS) 32.55 STREAM STD (UG/L) 17.0 STREAM STD (MG/L) 1.0 Upstream Bkgd (ug/1) 0 Upstream Bkgd (mg/1) 0.22 IWC (%) 5.55 IWC (%) 5.55 Allowable Conc. (ug/1) 306 Allowable Conc. (mg/1) 14.3 Ammonia (Winter) Monthly Average Limit (mg NH3-N/1) Fecal Coliform w7Q10 (CFS) 854 Monthly Average Limit: 200/100ml DESIGN FLOW (MGD) 21 (If DF >331; Monitor) DESIGN FLOW (CFS) 32.55 (If DF<331; Limit) STREAM STD (MG/L) 1.8 Dilution Factor (DF) 18.02 Upstream Bkgd (mg/1) 0.22 IWC (%) 3.67 Allowable Conc. (mg/1) 43.3 Total Residual Chlorine 1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity Ammonia (as NH3-N) 1. If Allowable Conc > 35 mg/l, Monitor Only 2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/I 3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis); capped at 35 mg/I Fecal Coliform 1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni) Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators MAXIMUM DATA POINTS = 58 Table 1. Project Information ❑ CHECK IF HQW OR ORW WQS Facility Name Winston-Salem - Muddy Creek WWTP WWTP/WTP Class Grade IV NPDES Permit NCO053042 Outfal I 001 Flow, Qw (MGD) 21.000 Receiving Stream Yadkin River HUC Number 03010104 Stream Class ElApply WS Hardness WQC WS-IV 7Q10s (cfs) 554.00 854.00 7Q10w (cfs) 30Q2 (cfs) 1849.00 QA (cfs) 446.82 1 Q10s (cfs) Effluent Hardness - - - - - - - - - - - - - 121.26 mg/L (Avg) - - - - - - - - - - - - - - - - - - - - - - Upstream Hardness - - - - - - - - - - - - - 30.55 mg/L (Avg) - - - - - - - - - - - - - - - - - - - - - - Combined Hardness Chronic 35.59 mg/L Combined Hardness Acute 36.71 m /L Data Source(s) Permittee-submitted DMRs and PPAs plus submitted instream hardness data. ❑ CHECK TO APPLY MODEL REQUIRED DATA ENTRY Par01 Par02 Par03 Par04 Par05 Par0611111111 Par07 Par08 Par09 Par10 Par11 Par12 Par13 Par14 Par15 Par16 Par17 Par18 Par19 Par20 Par21 Par22 Par23 Par24 Table 2. Parameters of Concern Name WQs Type Chronic Modifier Acute PQL Units Arsenic Aquactic Life C 150 FW 340 ug/L Arsenic Human Health Water Supply C 10 HH/WS N/A ug/L Beryllium Aquatic Life NC 6.5 FW 65 ug/L Cadmium Aquatic Life NC 0.7704 FW 4.5307 ug/L Chlorides Aquatic Life NC 230 FW mg/L Chlorinated Phenolic Compounds Water Supply NC 1 A ug/L Total Phenolic Compounds Aquatic Life NC 300 A ug/L Chromium III Aquatic Life NC 157.2092 FW 1239.7804 ug/L Chromium VI Aquatic Life NC 11 FW 16 pg/L Chromium, Total Aquatic Life NC N/A FW N/A pg/L Copper Aquatic Life NC 10.6558 FW 15.0398 ug/L Cyanide Aquatic Life NC 5 FW 22 10 ug/L Fluoride Aquatic Life NC 1,800 FW ug/L Lead Aquatic Life NC 4.3720 FW 116.1667 ug/L Mercury Aquatic Life NC 12 FW 0.5 na/L Molybdenum Human Health NC 2000 HH ug/L Nickel Aquatic Life NC 50.1915 FW 463.9566 pg/L Nickel Water Supply NC 25.0000 WS N/A pg/L Selenium Aquatic Life NC 5 FW 56 ug/L Silver Aquatic Life NC 0.06 FW 0.5739 ug/L Zinc Aquatic Life NC 170.9276 FW 174.0734 ug/L Chlorodibromomethane Human Health C 21 HH pg/L Chloroform Human Health NC 2000 HH pg/L Dichlorobromomethane Human Health I C 27 HH pg/L 50342 FW RPA 2023, input 8/3/2023 REASONABLE POTENTIAL ANALYSIS H1 Date 1 1 /2/2019 2 4/3/2019 3 4/24/2019 4 7/9/2019 5 10/14/2019 6 1 /15/2020 7 4/9/2020 8 7/27/2020 9 10/27/2020 10 1 /5/2021 11 1 /6/2021 12 4/13/2021 13 7/15/2021 14 10/13/2021 15 2/2/2022 16 4/13/2022 17 7/20/2022 18 10/12/2022 19 1 /11 /2023 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Data Effluent Hardness I BDL=1/2DL 100 100 112 112 112 112 124 124 148 148 100 100 144 144 136 136 118 118 122 122 120 120 132 132 144 144 132 132 108 108 68 68 132 132 132 132 120 120 Results Std Dev. Mean C.V. n 10th Per value Average Value Max. Value Use "PASTE SPECIAL- 11-12 Values" then "COPY". Maximum data points = 58 19.0579 121.2632 0.1572 19 100.00 mg/L 121.26 mg/L 148.00 mg/L Date 1 9/18/2017 2 11/13/2017 3 2/19/2018 4 5/14/2018 5 8/27/2018 6 11 /6/2018 7 2/5/2019 8 5/21 /2019 9 8/20/2019 10 11/12/2019 11 2/4/2020 12 5/5/2020 13 8/25/2020 14 11 /10/2020 15 2/16/2021 16 5/4/2021 17 8/10/2021 18 8/10/2021 19 11 /16/2021 20 2/22/2022 21 5/10/2022 22 5/10/2022 23 8/23/2022 24 8/23/2022 25 8/23/2022 26 8/23/2022 27 11 /15/2022 28 11 /15/2022 29 2/21 /2023 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Upstream Hardness Data BDL=1/2DL 16 16 32 32 32 32 32 32 24 24 40 40 20 20 104 104 23 23 20 20 28 28 16 16 38 38 20 20 36 36 18 18 22 22 22 22 47 47 24 24 20 20 20 20 41 41 41 41 41 41 41 41 24 24 24 24 20 20 Results Std Dev. Mean C.V. n 10th Per value Average Value Max. Value Use "PASTE SPECIAL - Values" then "COPY". Maximum data points = 58 16.8111 30.5517 0.5503 29 19.60 mg/L 30.55 mg/L 104.00 mg/L 50342 FW RPA 2023, data -2- 8/3/2023 REASONABLE POTENTIAL ANALYSIS Par01 & Par02 Date Data 1 1 /16/2019 < 2 4/3/2019 < 3 5/8/2019 < 4 7/17/2019 < 5 10/16/2019 < 6 1 /15/2020 < 7 6/18/2020 < 8 7/15/2020 < 9 10/14/2020 < 10 1 /6/2021 < 11 1 /13/2021 < 12 4/21 /2021 < 13 7/21 /2021 < 14 10/13/2021 < 15 2/2/2022 < 16 4/13/2022 < 17 7/20/2022 < 18 10/12/2022 < 19 1 /11 /2023 < 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Arsenic Use "PASTE SPECIAL - Values" then "COPY". Par03 Beryllium Maximum data points = 58 BDL=1/2DL Results Date Data BDL=1/2DL Results 2 1 Std Dev. 0.0000 1 10/2/2017 < 0.5 0.25 Std Dev. 2 1 Mean 1.0000 2 4/2/2019 < 0.5 0.25 Mean 2 1 C.V. 0.0000 3 1/6/2021 < 0.5 0.25 C.V. (default) 2 1 n 19 4 n 2 1 5 2 1 Mult Factor = 1.00 6 Mult Factor = 2 1 Max. Value 1.0 ug/L 7 Max. Value 2 1 Max. Pred Cw 1.0 ug/L 8 Max. Pred Cw 2 1 9 2 1 10 2 1 11 2 1 12 2 1 13 2 1 14 2 1 15 2 1 16 2 1 17 2 1 18 2 1 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Use "PASTE SPECIAL - Values" then "COPY". Maximum data points = 58 0.0000 0.2500 0.6000 3 3.00 0.25 ug/L 0.75 ug/L -3- 50342 FW RPA 2023, data 8/3/2023 REASONABLE POTENTIAL ANALYSIS Par04 Cadmium Use "PASTE SPECIAL - Values" then "COPY". Par05 Maximum data points = 58 Date Data BDL=1/2DL Results 1 1 /16/2019 < 0.15 0.075 Std Dev. 0.1533 1 2 4/3/2019 < 0.15 0.075 Mean 0.1279 2 3 5/8/2019 < 0.2 0.1 C.V. 1.1984 3 4 7/17/2019 < 0.2 0.1 n 19 4 5 10/16/2019 < 0.2 0.1 5 6 1/15/2020 < 0.2 0.1 Mult Factor = 1.75 6 7 6/18/2020 < 0.2 0.1 Max. Value 0.750 ug/L 7 8 7/15/2020 < 1.5 0.75 Max. Pred Cw 1.313 ug/L 8 9 10/14/2020 < 0.2 0.1 9 10 1 /6/2021 < 0.15 0.075 10 11 1 /13/2021 < 0.15 0.075 11 12 4/21 /2021 < 0.15 0.075 12 13 7/21 /2021 < 0.15 0.075 13 14 10/13/2021 0.18 0.18 14 15 2/2/2022 < 0.15 0.075 15 16 4/13/2022 < 0.15 0.075 16 17 7/20/2022 < 0.15 0.075 17 18 10/12/2022 < 0.15 0.075 18 19 1 /11 /2023 0.15 0.15 19 20 20 21 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 35 35 36 36 37 37 38 38 39 39 40 40 41 41 42 42 43 43 44 44 45 45 46 46 47 47 48 48 49 49 50 50 51 51 52 52 53 53 54 54 55 55 56 56 57 57 58 58 Date Data Chlorides BDL=1/2DL Results Std Dev Mean C.V. n Mult Factor = Max. Value Max. Pred Cw Use "PASTE SPECIAL - Values" then "COPY". Maximum data points = 58 NO DATA NO DATA NO DATA 0 N/A N/A mg/L N/A mg/L 50342 FW RPA 2023, data -4- 8/3/2023 REASONABLE POTENTIAL ANALYSIS Par06 Par07 Use "PASTE SPECIAL - Chlorinated Phenolic Compounds values" then "COPY Maximum data points = 58 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Date Data BDL=1/2DL Results Std Dev. Mean C.V. n Mult Factor = Max. Value Max. Pred Cw Total Phenolic Compounds Date Data 1 4/2/2019 < NO DATA NO DATA 2 1/5/2021 NO DATA 3 0 4 5 N/A 6 N/A ug/L 7 N/A ug/L 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 BDL=1/2DL Results 10 5 Std Dev. 42 42 Mean C.V. (default) n Mult Factor = Max. Value Max. Pred Cw Use "PASTE SPECIAL - Values" then "COPY". Maximum data points = 58 26.1630 23.5000 0.6000 2 3.79 42.0 ug/L 159.2 ug/L 50342 FW RPA 2023, data -5- 8/3/2023 REASONABLE POTENTIAL ANALYSIS 50342 FW RPA 2023, data 8/3/2023 REASONABLE POTENTIAL ANALYSIS Par10 Date Data 1 1 /16/2019 < 2 4/3/2019 < 3 5/8/2019 < 4 7/17/2019 < 5 10/16/2019 < 6 1 /15/2020 < 7 6/18/2020 < 8 7/15/2020 < 9 10/14/2020 < 10 1 /6/2021 < 11 1 /13/2021 < 12 4/21 /2021 < 13 7/21 /2021 < 14 10/13/2021 < 15 2/2/2022 < 16 4/13/2022 < 17 7/20/2022 < 18 10/12/2022 < 19 1 /11 /2023 < 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Chromium, Total BDL=1/2DL Results 2 1 Std Dev. 2 1 Mean 2 1 C.V. 2 1 n 2 1 2 1 Mult Factor = 2 1 Max. Value 2 1 Max. Pred Cw 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 Pall Use "PASTE SPECIAL - Values" then "COPY" . Maximum data points = 58 Date Data 0.0000 1 1 /16/2019 1.0000 2 4/3/2019 0.0000 3 5/8/2019 19 4 7/17/2019 5 10/16/2019 1.00 6 1/15/2020 1.0 Ng/L 7 6/18/2020 1.0 dig/L 8 7/15/2020 9 10/14/2020 10 1 /6/2021 11 1 /13/2021 12 4/21 /2021 13 7/21 /2021 14 10/13/2021 15 2/2/2022 16 4/13/2022 17 7/20/2022 18 10/12/2022 19 1 /11 /2023 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Use "PASTE SPECIAL - Copper Values" then "COPY". Maximum data points --58 BDL=1/2DL Results 9 9 Std Dev. 4 4 Mean 3 3 C.V. 5 5 n 5 5 5 5 Mult Factor = 5 5 Max. Value 7 7 Max. Pred Cw 6 6 3 3 2 2 3 3 3 3 24 24 3 3 4.2 4.2 2 2 7 7 3 3 4.8654 5.4316 0.8958 19 1.57 24.00 ug/L 37.68 ug/L 50342 FW RPA 2023, data -7- 8/3/2023 REASONABLE POTENTIAL ANALYSIS Par12 Date Data 1 1/15/2019 2 4/2/2019 3 5/7/2019 4 7/16/2019 5 10/15/2019 6 1 /14/2020 7 6/17/2020 < 8 7/14/2020 < 9 10/13/2020 < 10 1 /5/2021 < 11 1 /12/2021 < 12 4/20/2021 < 13 7/20/2021 14 10/12/2021 < 15 2/1/2022 < 16 4/12/2022 < 17 7/19/2022 18 10/11 /2022 < 19 1 /10/2023 < 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Par13 Use "PASTE SPECIAL- Use "PASTE SPECIAL - Cyanide Values" then "COPY". Fluoride Values" then "COPY". Maximum data points Maximum data points = 58 = 58 BDL=1/2DL Results Date Data BDL=1/2DL Results 10 10 Std Dev. 3.2209 1 Std Dev. NO DATA 5 5 Mean 10.53 2 Mean NO DATA 11 11 C.V. 0.3060 3 C.V. NO DATA 11 11 n 19 4 n 0 13 13 5 11 11 Mult Factor = 1.19 6 Mult Factor = N/A 20 10 Max. Value 21.0 ug/L 7 Max. Value N/A ug/L 20 10 Max. Pred Cw 25.0 ug/L 8 Max. Pred Cw N/A ug/L 20 10 9 20 10 10 20 10 11 5 5 12 21 21 13 20 10 14 20 10 15 20 10 16 13 13 17 20 10 18 20 10 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 50342 FW RPA 2023, data -8- 8/3/2023 REASONABLE POTENTIAL ANALYSIS Par14 Date 1 1 /16/2019 < 2 4/3/2019 < 3 5/8/2019 < 4 7/17/2019 < 5 10/16/2019 < 6 1 /15/2020 < 7 6/18/2020 < 8 7/15/2020 < 9 10/14/2020 < 10 1 /6/2021 < 11 1 /13/2021 < 12 4/21 /2021 < 13 7/21 /2021 < 14 10/13/2021 15 2/2/2022 < 16 4/13/2022 < 17 7/20/2022 < 18 10/12/2022 < 19 1 /11 /2023 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Par15 Use "PASTE SPECIAL- Use "PASTE SPECIAL - Lead Values" then "COPY". Mercury Values" then "COPY". Maximum data points Maximum data points = 58 = 58 BDL=1/2DL Results Date Data BDL=1/2DL Results 0.5 0.25 Std Dev. 2.9222 1 Std Dev. NO DATA 0.5 0.25 Mean 0.9353 2 Mean NO DATA 0.5 0.25 C.V. 3.1244 3 C.V. NO DATA 0.5 0.25 n 19 4 n 0 0.5 0.25 5 0.5 0.25 Mult Factor = 2.48 6 Mult Factor = N/A 0.5 0.25 Max. Value 13.000 ug/L 7 Max. Value N/A ng/L 0.5 0.25 Max. Pred Cw 32.240 ug/L 8 Max. Pred Cw N/A ng/L 0.5 0.25 9 0.5 0.25 10 0.5 0.25 11 0.54 0.27 12 0.5 0.25 13 13 13 14 0.5 0.25 15 0.5 0.25 16 0.5 0.25 17 0.5 0.25 18 0.5 0.5 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 50342 FW RPA 2023, data -9- 8/3/2023 REASONABLE POTENTIAL ANALYSIS Par16 Date Data 1 1 /16/2019 < 2 5/8/2019 < 3 7/17/2019 < 4 10/16/2019 < 5 1 /15/2020 < 6 6/18/2020 < 7 10/14/2020 < 8 1 /13/2021 < 9 4/21 /2021 < 10 7/21 /2021 < 11 10/13/2021 < 12 2/2/2022 < 13 4/13/2022 < 14 7/20/2022 < 15 10/12/2022 < 16 1 /11 /2023 < 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Par17 & Par18 Use "PASTE SPECIAL- Use "PASTE SPECIAL - Molybdenum Values" then "COPY". Nickel Values" then "COPY". Maximum data points Maximum data points = 58 = 58 BDL=1/2DL Results Date Data BDL=1/2DL Results 2 1 Std Dev. 0.1250 1 1/16/2019 3.6 3.6 Std Dev. 0.5666 2 1 Mean 1.0313 2 4/3/2019 2 2 Mean 1.9105 2 1 C.V. 0.1212 3 5/8/2019 1.5 1.5 C.V. 0.2965 2 1 n 16 4 7/17/2019 1.8 1.8 n 19 3 1.5 5 10/16/2019 2.2 2.2 2 1 Mult Factor = 1.09 6 1/15/2020 1.5 1.5 Mult Factor = 1.19 2 1 Max. Value 1.5 ug/L 7 6/18/2020 1.6 1.6 Max. Value 3.6 Ng/L 2 1 Max. Pred Cw 1.6 ug/L 8 7/15/2020 1.9 1.9 Max. Pred Cw 4.3 Ng/L 2 1 9 10/14/2020 1.7 1.7 2 1 10 1 /6/2021 2 2 2 1 11 1 /13/2021 1 1 2 1 12 4/21 /2021 2 2 2 1 13 7/21 /2021 2 2 2 1 14 10/13/2021 2.7 2.7 2 1 15 2/2/2022 2 2 2 1 16 4/13/2022 1.8 1.8 17 7/20/2022 2 2 18 10/12/2022 2 2 19 1 /11 /2023 1 1 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 -10- 50342 FW RPA 2023, data 8/3/2023 REASONABLE POTENTIAL ANALYSIS Par19 Par20 Use "PASTE SPECIAL- Use "PASTE SPECIAL - Selenium Values" then "COPY". Silver Values" then "COPY". Maximum data points Maximum data points = 58 = 58 Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results 1 1 /16/2019 < 2 1 Std Dev. 0.1873 1 1 /16/2019 < 0.5 0.25 Std Dev. 1.5715 2 4/3/2019 < 1 0.5 Mean 0.5789 2 4/3/2019 < 0.5 0.25 Mean 0.6105 3 5/8/2019 < 1 0.5 C.V. 0.3235 3 5/8/2019 < 0.5 0.25 C.V. 2.5740 4 7/17/2019 < 2 1 n 19 4 7/17/2019 < 0.5 0.25 n 19 5 10/16/2019 < 1 0.5 5 10/16/2019 < 0.5 0.25 6 1/15/2020 < 1 0.5 Mult Factor = 1.20 6 1/15/2020 7.1 7.1 Mult Factor = 2.32 7 6/18/2020 < 1 0.5 Max. Value 1.0 ug/L 7 6/18/2020 < 0.5 0.25 Max. Value 7.100 ug/L 8 7/15/2020 < 2 1 Max. Pred Cw 1.2 ug/L 8 7/15/2020 < 0.5 0.25 Max. Pred Cw 16.472 ug/L 9 10/14/2020 < 1 0.5 9 10/14/2020 < 0.5 0.25 10 1 /6/2021 < 1 0.5 10 1 /6/2021 < 0.5 0.25 11 1 /13/2021 < 1 0.5 11 1 /13/2021 < 0.5 0.25 12 4/21 /2021 < 1 0.5 12 4/21 /2021 < 0.5 0.25 13 7/21 /2021 < 1 0.5 13 7/21 /2021 < 0.5 0.25 14 10/13/2021 < 1 0.5 14 10/13/2021 < 0.5 0.25 15 2/2/2022 < 1 0.5 15 2/2/2022 < 0.5 0.25 16 4/13/2022 < 1 0.5 16 4/13/2022 < 0.5 0.25 17 7/20/2022 < 1 0.5 17 7/20/2022 < 0.5 0.25 18 10/12/2022 < 1 0.5 18 10/12/2022 < 0.5 0.25 19 1 /11 /2023 < 1 0.5 19 1 /11 /2023 < 0.5 0.25 20 20 21 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 35 35 36 36 37 37 38 38 39 39 40 40 41 41 42 42 43 43 44 44 45 45 46 46 47 47 48 48 49 49 50 50 51 51 52 52 53 53 54 54 55 55 56 56 57 57 58 58 50342 FW RPA 2023, data - 11 - 8/3/2023 REASONABLE POTENTIAL ANALYSIS Par21 Par22 Use "PASTE SPECIAL- Use "PASTE SPECIAL - Zinc Values" then "COPY". Chlorodibromomethane Values" then "COPY". Maximum data points Maximum data points = 58 = 58 Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results 1 1 /16/2019 98 98 Std Dev. 39.5641 1 10/2/2017 4.48 4.48 Std Dev. 1.2800 2 4/3/2019 52 52 Mean 58.1053 2 4/2/2019 < 10 5 Mean 3.6475 3 5/8/2019 39 39 C.V. 0.6809 3 6/11/2019 2.61 2.61 C.V. (default) 0.6000 4 7/17/2019 44 44 n 19 4 1 /5/2021 2.5 2.5 n 4 5 10/16/2019 49 49 5 6 1/15/2020 55 55 Mult Factor = 1.44 6 Mult Factor = 2.59 7 6/18/2020 36 36 Max. Value 210.0 ug/L 7 Max. Value 5.000000 pg/L 8 7/15/2020 53 53 Max. Pred Cw 302.4 ug/L 8 Max. Pred Cw 12.950000 pg/L 9 10/14/2020 46 46 9 10 1 /6/2021 38 38 10 11 1 /13/2021 42 42 11 12 4/21 /2021 42 42 12 13 7/21 /2021 40 40 13 14 10/13/2021 210 210 14 15 2/2/2022 58 58 15 16 4/13/2022 59 59 16 17 7/20/2022 35 35 17 18 10/12/2022 67 67 18 19 1 /11 /2023 41 41 19 20 20 21 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 35 35 36 36 37 37 38 38 39 39 40 40 41 41 42 42 43 43 44 44 45 45 46 46 47 47 48 48 49 49 50 50 51 51 52 52 53 53 54 54 55 55 56 56 57 57 58 58 50342 FW RPA 2023, data -12- 8/3/2023 REASONABLE POTENTIAL ANALYSIS Par23 Par24 Use "PASTE SPECIAL - Chloroform Values" then "COPY". Maximum data points = 58 Date Data 1 10/2/2017 2 4/2/2019 < 3 6/11 /2019 4 1 /5/2021 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Use "PASTE SPECIAL- Dichlorobromomethane Values" then "COPY". BDL=1/2DL Results Date Data 6.95 6.95 Std Dev. 1.1156 1 10/2/2017 10 5 Mean 5.8925 2 4/2/2019 < 6.76 6.76 C.V. (default) 0.6000 3 6/11/2019 4.86 4.86 n 4 4 1 /5/2021 5 Mult Factor = 2.59 6 Max. Value 6.950000 dig/L 7 Max. Pred Cw 18.000500 dig/L 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Maximum data points = 58 BDL=1/2DL Results 8.6 8.6 Std Dev. 1.6446 10 5 Mean 6.2050 5.94 5.94 C.V. (default) 0.6000 5.28 5.28 n 4 Mult Factor = 2.59 Max. Value 8.600000 pg/L Max. Pred Cw 22.274000 pg/L 50342 FW RPA 2023, data -13- 8/3/2023 REASONABLE POTENTIAL ANALYSIS -14- 50342 FW RPA 2023, data 8/3/2023 Winston-Salem - Muddy Creek WWTP NCO053042 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators MAXIMUM DATA POINTS = 58 Qw (MGD) = 21.0000 WWTP/WTP Class: Grade IV 1 Q l 0S (cfs) = 446.82 IWC% @ 1 Q 10S = 6.790162088 7Q10S (cfs) = 554.00 IWC% @ 7Q10S = 5.549399028 7Q10W (cfs) = 854.00 IWC% @ 7Q10W 3.671535728 30Q2 (cfs) = NO 30Q2 DATA IWC% @ 30Q2 = N/A Avg. Stream Flow, QA (cfs) = 1849.00 IW%C @ QA = 1.729956685 Receiving Stream: Yadkin River HUC 03010104 Stream Class: WS-IV Outfall 001 Qw = 21 MGD COMBINED HARDNESS (mg/L) Acute = 36.71 mg/L Chronic = 35.59 mg/L PARAMETER NC STANDARDS OR EPA CRITERIA co REASONABLE POTENTIAL RESULTS RECOMMENDED ACTION TYPE J H Chronic AcuteApplied D n # Det. Max Pred Cw Allowable Cw Standard Acute (FW): 5,007.2 Arsenic C 150 FW(7Q10s) 340 ug/L 19 0 1.0 _ Chronic (FW) 2,703.0 =2 Arsenic C 10 HH/WS(Qavg) ug/L NO DETECTS _Max _MDL Chronic (HH) 578.0 No detects - no monitoring or limits required Max MDL = 2 Acute: 957.27 Beryllium NC 6.5 FW(7Q10s) 65 ug/L 3 0 0.75 Note: n < 9 C.V. (default) Chronic: 117.13 No detects - no monitoring or limits required Limited data set NO DETECTS Max MDL = 0.5 Acute: 66.724 Cadmium NC 0.7704 FW(7Q10s) 4.5307 ug/L 19 2 1.313 Chronic: 13.883 No RP, Predicted Max < 50% of Allowable Cw - No No value > Allowable Cw Monitoring required Acute: NO WQS Chlorides NC 230 FW(7Q10s) mg/L 0 0 N/A --Chronic: ----4,144.E-- -------------------------- Acute: NO WQS Chlorinated Phenolic Compounds NC 1 A(30Q2) ug/L 0 0 N/A --Chronic: ----IWC? -- -------------------------- Acute: NO WQS Total Phenolic Compounds NC 300 A(30Q2) ug/L 2 1 159.2 Note: n < 9 C.V. (default) Chronic: IWC? Limited data set Acute: 18,258.5 Chromium III NC 157.2092 FW(7Q10s) 1239.7804 µg/L 0 0 N/A --Chronic:----2,832.9-- -------------------------- Acute: 235.6 Chromium VI NC 11 FW(7Q10s) 16 µg/L 0 0 N/A --Chronic:-----198.2 -- -------------------------- Chromium, Total NC µg/L 19 0 1.0 Max reported value = 1 No detects - no monitoring or limits required NO DETECTS Max MDL 2 Page 15 of 16 50342 FW RPA 2023, rpa 8/3/2023 Winston-Salem - Muddy Creek WWTP Outfall 001 NCO053042 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw=21 MGD Acute: 221.49 Copper NC 10.6558 FW(7Q10s) 15.0398 ug/L 19 19 37.68 Chronic: 192.02 No RP, Predicted Max < 50% of Allowable Cw - No No value > Allowable Cw Monitoring required Acute: 324.0 Cyanide NC 5 FW(7Q10s) 22 10 ug/L 19 8 25.0___ Chronic: 90.1 No RP, Predicted Max < 50% of Allowable Cw - No No value > Allowable Cw Monitoring required Acute: NO WQS Fluoride NC 1800 FW(7Q10s) ug/L 0 0 N/A --Chronic: --- 32,435.9 - -------------------------- Acute: 1,710.808 Lead NC 4.3720 FW(7Q10s) 116.1667 ug/L 19 2 32.240 Chronic: 78.783 No RP, Predicted Max < 50% of Allowable Cw - No No value > Allowable Cw Monitoring required Acute: NO WQS Mercury NC 12 FW(7Q10s) 0.5 ng/L 0 0 N/A --Chronic: ---- -- -------------------------- 216.2 Acute: NO WQS Molybdenum NC 2000 HH(7Q10s) ug/L 16 0 1.6 --Chronic: --- - -------------------------- 36,039.9 No detects - no monitoring or limits required NO DETECTS Max MDL = 3 Acute (FW): 6,832.8 Nickel NC 50.1915 FW(7Q10s) 463.9566 µg/L 19 19 4.3 _ Chronic (FW) 904.4 No RP, Predicted Max < 50% of Allowable Cw - No No value > Allowable Cw Monitoring required Nickel NC 25.0000 WS(7Q10s) µg/L ------------------------------ Chronic (WS) 450.5 No value > Allowable Cw Acute: 824.7 Selenium NC 5 FW(7Q10s) 56 ug/L 19 0 1.2 --Chronic:-----90-1 -- -------------------------- No detects - no monitoring or limits required NO DETECTS Max MDL = 2 Acute: 8.453 Silver NC 0.06 FW(7Q10s) 0.5739 ug/L 19 1 16.472 Chronic: 1.081 All data < 0.5 ug/L except for one value of 7.1 ug/L on 1 values > Allowable Cw 1/15/2020 Acute: 2,563.6 Zinc NC 170.9276 FW(7Q10s) 174.0734 ug/L 19 19 302.4 Chronic: 3,080.1 No RP, Predicted Max < 50% of Allowable Cw - No No value > Allowable Cw Monitoring required Acute: NO WQS Chlorodibromomethane C 21 HH(Qavg) µg/L 4 3 12.95000 Note: n < 9 C.V. (default) Chronic: 1213.90323 Limited data set No value > Allowable Cw Acute: NO WQS Chloroform NC 2000 HH(7Q1Os) µg/L 4 3 18.00050 Note: n < 9 C.V. (default) Chronic: 36039.93856 Limited data set No value > Allowable Cw Acute: NO WQS Dichlorobromomethane C 27 HH(Qavg) µg/L 4 3 22.27400 Note: n < 9 C.V. (default) Chronic: 1560.73272 Limited data set No value > Allowable Cw 50342 FW RPA 2023, rpa Page 16 of 16 8/3/2023 2018 Generic RPA - 95% Probability/95% Confidence MAXIMUM DATA POINTS = 58 `REQUIRED DATA ENTRY Table 1. Project Information ❑ CHECK IF HQW OR ORW Facility Name Winston-Salem - Muddy Creek WWTP WWTP/WTP Class Class IV NPDES Permit Outfall Flow, Qw (MGD) Receiving Stream Stream Class HUC Number 7Q10s (cfs) 7Q10w (cfs) 30Q2 (cfs) QA (cfs) 1 Q10s (cfs) Data Source(s) ❑ CHECK TO APPLY MODEL INt-WOU.542 001 21.000 Yadkin River WS-IV 03010104 554.00 854.00 446.62 Water Supply parameters of concern, data from DMRs Follow directions for data entry. In some cases a comment menu list the available choices or a dropdown menu will provide a list you may select from. Error message occur if data entry does not meet input criteria. Par01 Par02 Par03 Par04 3 Par05 Par06 Par07 Par08 Par09 Par10 Par11 Par12 Par13 Par14 Par15 Par16 Par17 Par18 Par19 Par20 Par21 Par22 Table 2. Parameters of Concern Name Type Chronic Modifier Acute PQL Units Nitrate Nitrogen NC 10 WS mg/L Hardness NC 100 WS mg/L 50342 RPA ext, input 8/3/2023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 REASONABLE POTENTIAL ANALYSIS Nitrate Nitrogen values" then "COPY" Hardness Values" then "COPY" Maximum data . Maximum data points = 58 points = 58 Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results 1/3/2023 22.7 22.7 Std Dev. 4.4303 1 1/2/2019 100 100 Std Dev. 19.0579 1/4/2023 24.5 24.5 Mean 21.0760 2 4/3/2019 112 112 Mean 121.2632 1/5/2023 21.4 21.4 C.V. 0.2102 3 4/24/2019 112 112 C.V. 0.1572 1 /6/2023 15.4 15.4 n 50 4 7/9/2019 124 124 n 19 1/9/2023 25.2 25.2 5 10/14/2019 148 148 1/10/2023 25 25 Mult Factor = 1.0200 6 1/15/2020 100 100 Mult Factor = 1.1000 1/11/2023 21.2 21.2 Max. Value 30.6 mg/L 7 4/9/2020 144 144 Max. Value 148.0 mg/L 1/12/2023 17.1 17.1 Max. Pred Cw 31.2 mg/L 8 7/27/2020 136 136 Max. Pred Cw 162.8 mg/L 1 /13/2023 19.9 19.9 9 10/27/2020 118 118 1 /17/2023 19.1 19.1 10 1 /5/2021 122 122 1 /18/2023 21 21 11 1 /6/2021 120 120 1/19/2023 22.9 22.9 12 4/13/2021 132 132 1/20/2023 25 25 13 7/15/2021 144 144 1/23/2023 27.9 27.9 14 10/13/2021 132 132 1 /24/2023 20.2 20.2 15 2/2/2022 108 108 1/25/2023 19.8 19.8 16 4/13/2022 68 68 1 /26/2023 19.1 19.1 17 7/20/2022 132 132 1 /27/2023 17.4 17.4 18 10/12/2022 132 132 1 /30/2023 17 17 19 1 /11 /2023 120 120 2/17/2023 16.3 16.3 20 2/20/2023 14.7 14.7 21 2/21 /2023 10.7 10.7 22 2/22/2023 10.2 10.2 23 2/23/2023 14 14 24 2/24/2023 14.7 14.7 25 2/27/2023 19.2 19.2 26 2/28/2023 19 19 27 3/1 /2023 19.3 19.3 28 3/2/2023 22.7 22.7 29 3/3/2023 16.5 16.5 30 3/6/2023 18.5 18.5 31 3/7/2023 21.1 21.1 32 3/8/2023 20.4 20.4 33 3/9/2023 19.3 19.3 34 3/10/2023 19.2 19.2 35 3/13/2023 26 26 36 3/14/2023 25.7 25.7 37 3/15/2023 25.6 25.6 38 3/16/2023 29 29 39 3/17/2023 30.6 30.6 40 3/20/2023 26.8 26.8 41 3/21 /2023 25.6 25.6 42 3/22/2023 24.1 24.1 43 3/23/2023 21.3 21.3 44 3/24/2023 20.8 20.8 45 3/27/2023 23 23 46 3/28/2023 24 24 47 3/29/2023 24.4 24.4 48 3/30/2023 24.2 24.2 49 3/31 /2023 25.1 25.1 50 51 52 53 54 55 56 57 58 50342 RPA ext, data -2- 8/3/2023 Winston-Salem - Muddy Creek WWTP REASONABLE POTENTIAL ANALYSIS Outfall 001 NCOO5O342 2018 Generic RPA - 95% Probability/95% Confidence MAXIMUM DATA POINTS = 58 Qw (MGD) = 21.0000 WWTP/WTP Class: Class IV IQ10S (cfs) = 446.82 IWC% @ 1Q10S = 6.79016209 7Q10S (cfs) = 554.00 IWC% @ 7Q10S — 5.54939903 7Q10W (cfs) = 854.00 IW%C @ 7Q10W = 3.67153573 30Q2 (cfs) = NO 30Q2 DATA IWC% @ 30Q2 = N/A Avg. Stream Flow, QA (cfs) = 1849.00 IWC% @ QA = 1.72995668 Receiving Stream: Yadkin River HUC 03010104 Stream Class: WS-IV Qw=21 MGD PARAMETER NC STANDARDS OR EPA CRITERIA (n REASONABLE POTENTIAL RESULTS RECOMMENDED ACTION TYPE J M Applied Chronic Acute n # Det. Max Pred Cw Allowable Cw Standard Acute: NO WQS Nitrate Nitrogen NC 10 WS(7QIOs) mg/L 50 50 31.2 Chronic:-----180.20 ------------------------------ No value > Allowable Cw Acute: NO WQS Hardness NC 100 WS(7Q10s) mg/L 19 19 162.8 Chronic:----1,802.00 ----------------------------- No value > Allowable Cw Acute: 0 0 N/A Acute: 0 0 N/A Acute: 0 0 N/A ---------------- Chronic: -------------------------- Acute: 0 0 N/A Acute: 0 0 N/A Acute: 0 0 N/A Acute: 0 0 N/A ---------------- Chronic: -------------------------- Acute: 0 0 N/A Chronic: Page 3 of 3 50342 RPA ext, rpa 8/3/2023 Permit No. NC0050342 NPDES Implementation of Instream Dissolved Metals Standards - Freshwater Standards The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by the NC Environmental Management Commission (EMC) on November 13, 2014. The US EPA subsequently approved the WQS revisions on April 6, 2016, with some exceptions. Therefore, metal limits in draft permits out to public notice after April 6, 2016 must be calculated to protect the new standards - as approved. Table 1. NC Dissolved Metals Water Q ality Standards/A uatic Life Protection Parameter Acute FW, µg/1 (Dissolved) Chronic FW, µg/l (Dissolved) Acute SW, µg/l (Dissolved) Chronic SW, µg/l (Dissolved) Arsenic 340 150 69 36 Beryllium 65 6.5 --- --- Cadmium Calculation Calculation 40 8.8 Chromium III Calculation Calculation --- --- Chromium VI 16 11 1100 50 Copper Calculation Calculation 4.8 3.1 Lead Calculation Calculation 210 8.1 Nickel Calculation Calculation 74 8.2 Silver Calculation 0.06 1.9 0.1 Zinc Calculation Calculation 90 81 Table 1 Notes: 1. FW= Freshwater, SW= Saltwater 2. Calculation = Hardness dependent standard 3. Only the aquatic life standards listed above are expressed in dissolved form. Aquatic life standards for Mercury and selenium are still expressed as Total Recoverable Metals due to bioaccumulative concerns (as are all human health standards for all metals). It is still necessary to evaluate total recoverable aquatic life and human health standards listed in 15A NCAC 213.0200 (e.g., arsenic at 10 µg/l for human health protection; cyanide at 5 µg/L and fluoride at 1.8 mg/L for aquatic life protection). Table 2. Dissolved Freshwater Standards for Hardness -Dependent Metals The Water Effects Ratio (WER) is equal to one unless determined otherwise under 15A NCAC 02B .0211 Subparagraph (11)(d) Metal NC Dissolved Standard, µg/I Cadmium, Acute WER*{1.136672-[ln hardness](0.041838)} e^{0.9151 [In hardness]-3.1485{ Cadmium, Acute Trout waters WER*{1.136672-[ln hardness](0.041838)} e^{0.9151[In hardness]-3.6236} Cadmium, Chronic WER*{1.101672-[ln hardness](0.041838)} e^{0.7998[ln hardness]-4.4451} Chromium III, Acute WER*0.316 e^{0.8190[ln hardness]+3.7256} Chromium III, Chronic WER*0.860 e^{0.8190[ln hardness]+0.6848} Copper, Acute WER*0.960 e^{0.9422[ln hardness]-1.700} Copper, Chronic WER*0.960 e^{0.8545[ln hardness]-1.702} Lead, Acute WER*{1.46203-[ln hardness](0.145712)} • e^{1.273[ln hardness]-1.4601 Lead, Chronic WER*{1.46203-[ln hardness](0.145712)} • e^{1.273[ln hardness]-4.705} Nickel, Acute WER*0.998 e^{0.8460[ln hardness]+2.255} Nickel, Chronic WER*0.997 e^{0.8460[ln hardness]+0.0584} Page 1 of 4 Permit No. NCO050342 Silver, Acute WER*0.85 • e^{1.72[ln hardness]-6.59) Silver, Chronic Not applicable Zinc, Acute WER*0.978 e^{0.8473[ln hardness]+0.884) Zinc, Chronic WER*0.986 e^{0.8473[ln hardness]+0.884) General Information on the Reasonable Potential Analysis (RPA) The RPA process itself did not change as the result of the new metals standards. However, application of the dissolved and hardness -dependent standards requires additional consideration in order to establish the numeric standard for each metal of concern of each individual discharge. The hardness -based standards require some knowledge of the effluent and instream (upstream) hardness and so must be calculated case -by -case for each discharge. Metals limits must be expressed as `total recoverable' metals in accordance with 40 CFR 122.45(c). The discharge -specific standards must be converted to the equivalent total values for use in the RPA calculations. We will generally rely on default translator values developed for each metal (more on that below), but it is also possible to consider case -specific translators developed in accordance with established methodology. RPA Permitting Guidance/WQBELs for Hardness -Dependent Metals - Freshwater The RPA is designed to predict the maximum likely effluent concentrations for each metal of concern, based on recent effluent data, and calculate the allowable effluent concentrations, based on applicable standards and the critical low -flow values for the receiving stream. If the maximum predicted value is greater than the maximum allowed value (chronic or acute), the discharge has reasonable potential to exceed the standard, which warrants a permit limit in most cases. If monitoring for a particular pollutant indicates that the pollutant is not present (i.e. consistently below detection level), then the Division may remove the monitoring requirement in the reissued permit. To perform a RPA on the Freshwater hardness -dependent metals the Permit Writer compiles the following information: • Critical low flow of the receiving stream, 7Q 10 (the spreadsheet automatically calculates the 1 Q 10 using the formula 1 Q 10 = 0.843 (s7Q 10, cfs) 0.993 • Effluent hardness and upstream hardness, site -specific data is preferred • Permitted flow • Receiving stream classification 2. In order to establish the numeric standard for each hardness -dependent metal of concern and for each individual discharge, the Permit Writer must first determine what effluent and instream (upstream) hardness values to use in the equations. The permit writer reviews DMR's, Effluent Pollutant Scans, and Toxicity Test results for any hardness data and contacts the Permittee to see if any additional data is available for instream hardness values, upstream of the discharge. If no hardness data is available, the permit writer may choose to do an initial evaluation using a default hardness of 25 mg/L (CaCO3 or (Ca + Mg)). Minimum and maximum limits on the hardness value used for water quality calculations are 25 mg/L and 400 mg/L, respectively. If the use of a default hardness value results in a hardness -dependent metal showing reasonable potential, the permit writer contacts the Permittee and requests 5 site -specific effluent and upstream hardness samples over a period of one week. The RPA is rerun using the new data. Page 2 of 4 Permit No. NCO050342 The overall hardness value used in the water quality calculations is calculated as follows: Combined Hardness (chronic) _ (Permitted Flow, cfs *Avg. Effluent Hardness, mg/L) + (s7Q 10, cfs *Avg. Upstream Hardness, mg/L) (Permitted Flow, cfs + s7Q 10, cfs) The Combined Hardness for acute is the same but the calculation uses the IQ 10 flow. 3. The permit writer converts the numeric standard for each metal of concern to a total recoverable metal, using the EPA Default Partition Coefficients (DPCs) or site -specific translators, if any have been developed using federally approved methodology. EPA default partition coefficients or the "Fraction Dissolved" converts the value for dissolved metal at laboratory conditions to total recoverable metal at in -stream ambient conditions. This factor is calculated using the linear partition coefficients found in The Metals Translator: Guidance for Calculating a Total Recoverable Permit Limit from a Dissolved Criterion (EPA 823-B-96-007, June 1996) and the equation: Cdiss = 1 Ctotal 1 + { [Kpo] [ss(I+a)] [10-6] } Where: ss = in -stream suspended solids concentration [mg/1], minimum of 10 mg/L used, and Kpo and a = constants that express the equilibrium relationship between dissolved and adsorbed forms of metals. A list of constants used for each hardness -dependent metal can also be found in the RPA program under a sheet labeled DPCs. 4. The numeric standard for each metal of concern is divided by the default partition coefficient (or site -specific translator) to obtain a Total Recoverable Metal at ambient conditions. In some cases, where an EPA default partition coefficient translator does not exist (ie. silver), the dissolved numeric standard for each metal of concern is divided by the EPA conversion factor to obtain a Total Recoverable Metal at ambient conditions. This method presumes that the metal is dissolved to the same extent as it was during EPA's criteria development for metals. For more information on conversion factors see the June, 1996 EPA Translator Guidance Document. 5. The RPA spreadsheet uses a mass balance equation to determine the total allowable concentration (permit limits) for each pollutant using the following equation: Ca = (s7Q 10 + Qw) (Cwgs)-(s7Q10) (Cb) Qw Where: Ca = allowable effluent concentration (µg/L or mg/L) Cwqs = NC Water Quality Standard or federal criteria (µg/L or mg/L) Cb = background concentration: assume zero for all toxicants except NH3* (µg/L or mg/L) Qw = permitted effluent flow (cfs, match s7Q 10) s7Q 10 = summer low flow used to protect aquatic life from chronic toxicity and human health through the consumption of water, fish, and shellfish from noncarcinogens (cfs) * Discussions are on -going with EPA on how best to address background concentrations Flows other than s7Q 10 may be incorporated as applicable: IQ 10 = used in the equation to protect aquatic life from acute toxicity Page 3 of 4 Permit No. NC0050342 QA = used in the equation to protect human health through the consumption of water, fish, and shellfish from carcinogens 30Q2 = used in the equation to protect aesthetic quality 6. The permit writer enters the most recent 2-3 years of effluent data for each pollutant of concern. Data entered must have been taken within four and one-half years prior to the date of the permit application (40 CFR 122.21). The RPA spreadsheet estimates the 95th percentile upper concentration of each pollutant. The Predicted Max concentrations are compared to the Total allowable concentrations to determine if a permit limit is necessary. If the predicted max exceeds the acute or chronic Total allowable concentrations, the discharge is considered to show reasonable potential to violate the water quality standard, and a permit limit (Total allowable concentration) is included in the permit in accordance with the U.S. EPA Technical Support Document for Water Quality -Based Toxics Control published in 1991. 7. When appropriate, permit writers develop facility specific compliance schedules in accordance with the EPA Headquarters Memo dated May 10, 2007 from James Hanlon to Alexis Strauss on 40 CFR 122.47 Compliance Schedule Requirements. The Total Chromium NC WQS was removed and replaced with trivalent chromium and hexavalent chromium Water Quality Standards. As a cost savings measure, total chromium data results may be used as a conservative surrogate in cases where there are no analytical results based on chromium III or VI. In these cases, the projected maximum concentration (95th %) for total chromium will be compared against water quality standards for chromium III and chromium VI. 9. Effluent hardness sampling and instream hardness sampling, upstream of the discharge, are inserted into all permits with facilities monitoring for hardness -dependent metals to ensure the accuracy of the permit limits and to build a more robust hardness dataset. 10. Hardness and flow values used in the Reasonable Potential Analysis for this permit included: Parameter Value Comments (Data Source) Average Effluent Hardness, mg/L 121 Permittee submitted DMRs (Total as CaCO3) Average Upstream Hardness, mg/L 30.6 Permittee submitted data (Total as CaCO3) 7Q10 summer (cfs) 554 Reported in previous permit Fact Sheet 1Q10 (cfs) 446.82 Calculated in RPA spreadsheet Permitted Flow (MGD) 21.0 Design flow Date: June 16, 2023 Permit Writer: Gary Perlmutter Page 4 of 4 8/3/23 WQS = 12 ng/L MERCURY WQBEL/TBEL EVALUATION V:2013-6 Facility Name Winston-Salem - Muddy Creek WWTP / NC0050342 No Limit Required /Permit No. MMP Required Total Mercury 1631E PQL = 0.5 ng/L 7Q10s = 554.000 cfs WQBEL = 216.24 ng/L Date Modifier Data Entry Value Permitted Flow = 21.000 47 ng/L 4/2/19 1.95 1.95 5/7/19 1.26 1.26 7/17/19 4.85 4.85 10/16/19 5.83 5.83 3.5 ng/L - Annual Average for 2019 1/22/20 1.62 1.62 4/3/20 1.63 1.63 7/10/20 2.03 2.03 10/2/20 < 0.5 0.5 1.4 ng/L - Annual Average for 2020 1/8/21 1.26 1.26 4/12/21 1.15 1.15 7/9/21 1.51 1.51 10/1/21 1.13 1.13 1.3 ng/L - Annual Average for 2021 1/7/22 1.46 1.46 4/8/22 0.76 0.76 7/15/22 1.43 1.43 10/14/22 4.56 4.56 2.1 ng/L - Annual Average for 2022 1/13/23 1.95 1.95 2.0 ng/L - Annual Average for 2023 RE: [EXTERNAL] Re: Additional Information request: Muddy Cr WWTP Bonnie McKee <BONNIEM@cityofws.org> Wed 5/17/2023 8:46 AM To: Keith Jones < keithj@cityofws.org >;Bill Brewer<billb@cityofws.org>;Perlmutter, Gary <gary.perlmutter@ncdenr.gov> Cc: Courtney Driver <courtneyd@cityofws.org>;Michael W. Stover < michaelws@cityofws.org >;Joel Freeman <JOELF@cityofws.org>;Matthew Lavigne <mathewl@cityofws.org> 2 attachments (1 MB) Muddy Chronic TOX Tables E.pdf, V2Muddy Creek Flow Diagram 122021.pdf, CAUTION: External email. Do not click links or open attachments unless verified. Report suspicious emails with the Report Message button located on your Outlook menu bar on the Home tab. Good Morning, I hope you are well. Our final application package is quite large and I wasn't sure if it would come through to you. I'm sending the individual files for the items your requesting. Attached are the Fathead Minnow reports and the Process Narrative. As for the Chemical Addendum, we currently do not have any additional pollutants to report. Please let me know if you need anything additional. Bonnie McKee Archie Elledge WWTP Utilities Plant Supervisor -Manson Meads Laboratory 2799 Griffith Rd. Winston Salem, NC 27103 336.397.7618 bonniem@cityofws.org From: Keith Jones <keithj@cityofws.org> Sent: Tuesday, May 16, 2023 4:48 PM To: Bill Brewer <billb@cityofws.org> Cc: Courtney Driver <courtneyd@cityofws.org>; Michael W. Stover <michaelws@cityofws.org>; Joel Freeman <JOELF@cityofws.org>; Matthew Lavigne <mathewl@cityofws.org>; Bonnie McKee <BONNIEM@cityofws.org> Subject: FW: [EXTERNAL] Re: Additional Information request: Muddy Cr WWTP no Please look at the forwarded email from Gary Hudson about the Muddy Creek WWTP permit renewal. Joel and I have had some conversations about the requested information and have some thoughts about this. I was able to find all the documents that were used or sent in for permit renewal. I am planning on meeting with the wastewater staff first and getting our thoughts together. You are more than welcome to join our conversation about this matter. Then I will request a meeting with Gary about his questions. I just want to keep you in the loop about this situation. Thanks Keith Jones Assistant Utility Plant Superintendent Winston-Salem/Forsyth County Utilities Manson Meads Complex 2799 Griffith Road Winston-Salem, N.C. 27103 0: 336-397-7678, M: 336-345-7277 Keith) cityofws.org From: Joel Freeman <JOELF cityofws.org> Sent: Tuesday, May 16, 2023 4:04 PM To: Keith Jones <keithj@cityofws.org> Subject: FW: [EXTERNAL] Re: Additional Information request: Muddy Cr WWTP From: Perlmutter, Gary <garyperlmutter@ncdenr.gov> Sent: Tuesday, May 16, 2023 4:03 PM To: Joel Freeman <JOELF cityofws.org> Subject: [EXTERNAL] Re: Additional Information request: Muddy Cr WWTP CAUTION:***EXTERNAL SENDER *** STOP. EVALUATE. VERIFY. Were you expecting this email? Does the content make sense? Can you verify the sender? If the email is suspicious: Do not click links or open attachments. Click the Report Message button in Outlook to notify Information Systems. P.S. One more item to request: the second species (Fathead Minnow) toxicity lab report from July 2019. Thank you again, Gary Perlmutter, MSc. Environmental Specialist II NCDEQ/Division of Water Resources NPDES Municipal Permitting Unit 919-707-3611 Office 919-306-1017 Cell garyperlmutter@ncdenr.gov Physical Address: 512 N Salisbury St., Raleigh, NC 27604 Mailing Address: 1617 Mail Service Center, Raleigh, NC 27699-1617 Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. From: Perlmutter, Gary <gary.perlmutter @ncdenr.gov> Sent: Tuesday, May 16, 2023 3:45 PM To: joelf@cityofws.org <joelf@cityofws.org> Subject: Additional Information request: Muddy Cr WWTP Dear Joel, I have left a message on your voicemail and am following up here. I am working on the Muddy Creek WWTP and in review of the N PDES permit (NC0050342) renewal application, I found the following items missing and here requested: • Process Narrative Mercury Minimization Plan (MMP) update Chemical Addendum Regarding the Chemical Addendum, please complete the attached Excel forms with additional chemicals you anticipate to be in the facility's effluent not currently reported. These include the emerging contaminants 1,4- Dioxane and PFAS chemical group. Please use the Chemical Addendum to NPDES application for those parameters that are tested for by an EPA -approved method (e.g., 1,4-Dioxane); the Chemical Addendum - Supplemental is for those parameters lacking an EPA -approved method (e.g., PFAS chemicals). More information can be found here: https://www.deq.nc.gov/about/divisions/water-resources/permittingLpdes- wastewater/npdes-permitting=process npdes-individual-permit-applications. Also, I have come across an e-mail correspondence between you and my predecessor, Diana Yitbarek dated February 2021, regarding a split industrial flow to Muddy Creek and Archie Elledge WWTPs (attached). I can insert the suggested language into the permit renewals (I will be working on Archie Elledge WWTP's permit as well) as proposed for a modification in 2021. Please let me know what you think. I look forward to your response. Thanks, Gary Perlmutter Gary Perlmutter, MSc. Environmental Specialist II NCDEQ/Division of Water Resources NPDES Municipal Permitting Unit 919-707-3611 Office 919-306-1017 Cell ga ry. pert m utter@ ncden r.gov Physical Address: 512 N Salisbury St., Raleigh, NC 27604 Mailing Address: 1617 Mail Service Center, Raleigh, NC 27699-1617 Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. tUnston-Salem / Forsyth County tiolieties Water • Wastewater • Solid Waste Wastewater Division, 2799 Griffith Road, Winston-Salem, NC 27103 O: 336-727-8000, F: 336-659-4320, wskutiiities.org June 15, 2023 Gary Perlmutter, MSc. NCDEQ/Division of Water Resources NPDES Municipal Permitting Unit 512 N Salisbury St. Raleigh, NC 27604 Permit Renewal Reduced Monitoring Request Dear Mr. Perlmutter, The City of Winston Salem would like to request reduced monitoring for the Muddy Creek WWTP NCO050342 for the following parameters; cBOD, TSS, Ammonia, fecal coliform, and specific conductance. The following table shows the 3 year mean for each. Muddy Creek 3 Year Averages cBOD TSS N113 Fecal Conductivity Weekly Limit Weekly Limit Weekly Limit Weely Limit No Assigned 40 m 45 m 35 m 400/100mL Limit 14 17 0,48 64 688 The Muddy Creek facility has fulfilled all the approval criteria listed in the DWQ Guidance Regarding the Reduction of Monitoring Frequencies in the NPDES Permits for Exceptionally Performing Facilities October 22, 2012 document. Sincerely, Ozie LhJoneso Assistant Utilities Plant Superintendent GOISM City Council: Mayor Allen Joines; Denise D, Adams, Mayor Pro Tempore, North Ward; Barbara Hanes Burke, Northeast Ward; Robert C. Clark, West Ward; John C. Larson, South Ward; Jeff Macintosh, Northwest Ward, Kevin Mundy, Southwest Ward; Annette Scipplo, East Ward; James Taylor, Jr., SoutheastWard; City Manager: Lee D. Garrity County Commissioners: Don Martin, Chair, Glorfa D. Whlsenhunt, Vice Chair; Dan Besse; Richard V. Linville; Tonya D. McDaniel; David R. Plyler, Malishal Call311 nr336-727.8000 Woodbury; County Manager: DudleyWatts,Jr. titylink@eityoiws.nr0 Win ston-Salem/ForsythCounty tJtility Commission: L. Wesley Curtis, Jr., Chair; Chris Parker, Vice Chair; Simpson 0. Brown, Jr.;Harold Eustache;Tom Griffin; Yvonne H. Hines; Hugh W. Jernigan; Duane Long; Calvin McRae; Charles Wilson; Allan Younger Reduction in Frequency Evalaution Facility: Muddy Creek WWTP Permit No. NC0050342 Review period 04/2021 - 03/2023 (use 3 yrs) Approval Criteria: Y/N? 1. Not currently under SOC Y 2. Not on EPA Quarterly noncompliance report Y 3. Facility or employees convicted of CWA violations N # of non - Monthly 3-yr mean # daily # daily Reduce Weekly 50% 200% < 200% monthly #civil penalty Data Review Units average (geomean < 50%7 samples samples < 20? > 2? > 1? Frequency? average limit limit MA for FC) MA > 200% 157 WA >200% limit asessment (Yes/No) violations CBOD (summer) mg/L 40.00 25.00 1 13 15.40 N 50.00 3 Y 1 N 0 N N TSS mg/L 45.00 30.00 15 10.96 Y 60.00 3 Y 0 N 0 N Y Ammonia (summer) mg/L 35.00 14.00 7 0.31 Y 28.00 0 Y 0 N 0 N Y Fecal Coliform #/100 400.00 200.00 100 19.79 Y 800 4 Y 0 N 0 N Y