No preview available
HomeMy WebLinkAboutNC0029033_Pretreatment Audit_20211228DocuSign Envelope ID: 6298500A-DAC7-44EE-850B-897FC729D10D ROY COOPER Governor ELIZABETH S. BISER Secretary S. DANIEL SMITH Director Mr. Robert Massengill, PE Public Utilities Director City of Raleigh PO Box 590 Raleigh, NC 27602 NORTH CAROLINA Environmental Quality December 28, 2021 Subject: Pretreatment Audit City of Raleigh Neuse River Resource Recovery Facility (NRRRF) - NPDES Permit No. NC0029033 Little Creek WWTP - NPDES Permit No. NC0079316 Wake County Dear Mr. Massengill: On September 21, 2021, Cheng Zhang of the Raleigh Regional Office conducted an audit of City of Raleigh's pretreatment program. The assistance given by Ms. Sarah Gornick, the Industrial Pretreatment Coordinator, was greatly appreciated. The inspection report is attached. Findings during the inspection were as follows: 1. There are 17 Significant Industrial Users (SIUs) discharging to the POTW, 15 of which are also Categorical Industrial Users (CIUs). It was noted that no SIUs were in Significant Non -Compliance (SNC) during the two most recent semi-annual periods. 2. The pretreatment inspection file review included Accu-Fab (Permit No. AFAB), Alsco (Permit No. SERV) and Ajinomoto (Permit No. AJIN). The files needed for review were available for inspection, contained all the required elements and were in excellent condition. In the first half of 2021, all three SIUs were in compliance. 3. A review of the files containing the pretreatment program elements was conducted. All files were available, up to date, and well organized. 4. Long Term Monitoring Plan (LTMP) data since the last inspection were reviewed, it was noted that all parameters were sampled at required locations and analyzed with required detection levels. LTMP data was well organized and maintained. 5. As part of the audit, the inspector watched Ms. Gornick conduct an inspection of one of the City's SIUs, Accu-Fab. The inspection was very thorough. It was evident that Ms. NOR�D_E �eeabnenl al EnNrvnmenlel5uelil, North Carolina Department of Environmental Quality I Division of Water Resources Raleigh Regional Office 13800 Barrett Drive I Raleigh, North Carolina 27609 919.791.4200 DocuSign Envelope ID: 6298500A-DAC7-44EE-850B-897FC729D1OD Gornick has good relationship with the industry representative and broad knowledge of the SIU's pretreatment operation. City of Raleigh's pretreatment Program is very well managed. Thank you for your continued support of the Pretreatment Program. If you have any questions or comments, please call Cheng Zhang at (919) 791-4200 (or email: cheng.zhang@ncdenr.gov). Sincerely, FDocuSigned by: iatiu.ssa, . haV>„lt,l, B2916E6AB32144F... Vanessa E. Manuel, Assistant Regional Supervisor Water Quality Regional Operations Section Raleigh Regional Office Division of Water Resources Attachments: PT Audit Form Cc: Central Files w/attachment (Laserfiche) Raleigh Regional Office w/attachment Sarah Gornick, City of Raleigh (electronic copy only) 1:11 NORTH CAROLINA ��� neprhnom of Environmental TunIi North Carolina Department of Environmental Quality I Division of Water Resources Raleigh Regional Office r 3800 Barrett Drive I Raleigh, North Carolina 27609 919.791.4200 DocuSign Envelope ID: 6298500A-DAC7-44EE-850B-897FC729D10D NORTH CAROLINA DIVISION OF WATER RESOURCES PRETREATMENT AUDIT REPORT Water Resources ENVIRONMENTAL QUALITY Background Information [Complete prior to audit; review Program Info Database Sheet(s)] 1. Control Authority (POTW) Name: City of Raleigh 2. Control Authority Representative(s): Sarah Gornick 3. Title(s): Industrial Pretreatment Coordinator 4. Address of POTW: Mailing PO Box 590 City Raleigh, NC Zip Code 27602-0590 Phone Number 919-996-3715 Fax Number 919-996-1858 E-Mail sarah.gornick(i/raleighnc.gov 5. Audit Date 09/21/2021 6. Last Inspection Date: 09/24/2020 Inspection Type: ® PCI ❑ Audit 7. Has Program Completed All Requirements from the Previous Inspection and Program Info Sheet(s) ? ® Yes ❑ No If No, Explain. 8. In the last year has the POTW experienced any NPDES or Sludge Permit compliance problems? ❑ Yes ® No If Yes, Explain. 9. Is POTW under an Order That Includes Pretreatment Conditions? ❑ Yes ® No Order Type and Number: Are Milestone Dates Being Met? ❑ Yes ❑ No ® NA Parameters Covered Under Order ICIS Coding Main Program Permit Number N I C 10I 0I 2 19 1 0 1 3 13 I NC0079316 10. Current Number of Significant Industrial Users (SIUs)? 11. Number of SIUs with No IUP, or with an Expired IUP? MM/DD/YY 09 21 121 17 0 12. Number of SIUs Not Inspected by POTW in Last Calendar Year? 0 13. Number of SIUs Not Sampled by POTW in Last Calendar Year? 0 14. Number of SIUs in SNC for Limits Violations During Either of Last 2 Semi -Annual Periods? 0 15. Number of SIUs in SNC for Reporting During Either of Last 2 Semi -Annual Periods? 0 16. Number of SIUs in SNC with Pretreatment Schedule? 0 17. Number of SIUs on Schedules? 0 18. Current Number of Categorical Industrial Users (CIUs)? 19. Number of CIUs in SNC? 15 0 NC DWR Pretreatment Audit Form Revised: December 2016 Page 1 DocuSign Envelope ID: 6298500A-DAC7-44EE-850B-897FC729D1OD 20. PRETREATMENT PROGRAM ELEMENTS REVIEW- Review POTW files, verify POTW has copy of each Program Element in their File, complete with all supporting documents and PERCS Approval Letter, and dates consistent with Program Info: Program Element Last Submittal Date In file? Last Approval Date In file Date Next Due, If Applicable Headworks Analysis (HWA) 4/1/2020 01 Yes ❑ No 5/28/2021 ❑ Yes ❑ No 4/1/2025 3/29/2018 6/7/2018 4/1/2023 /1 Yes ❑ No /1 Yes ❑ No Industrial Waste Survey (IWS) 1/27/2018 0 Yes ❑ No 2/12/2018 /1 Yes ❑ No 2/1/2023 Sewer Use Ordinance (SUO) 1/2/2013 0 Yes ❑ No 1/3/2013 /1 Yes ❑ No Enforcement Response Plan (ERP) 2/11/2020 0 Yes ❑ No 2/14/2020 /1 Yes ❑ No Long Term Monitoring Plan (LTMP) 5/1/2020 0 Yes ❑ No 7/17/2020 /1 Yes ❑ No 5/1/2020 7/17/2020 Legal Authority (Sewer Use Ordinance-SUO) 21. Do you have any towns and/or areas from which you receive wastewater which are not in your annexed jurisdiction? ® Yes ❑ No If yes, Please list these towns and/or areas. Town of Middlesex and Town of Clayton 22. If yes to #21, Do you have current Interjurisdictional Agreements (IJAs) or other Contracts? ® Yes ❑ No ❑ NA A copy, if not already submitted, should be sent to Division. 23. If yes to #21, Have you had any trouble working with these towns or districts? ❑ Yes ® No ❑ NA If yes, Explain. 24. Date of Last SUO Adoption by Local Council 12/6/2012 25. Have you had any problems interpreting or enforcing any part of the SUO? ❑ Yes ❑ No If yes, Explain. Enforcement (Enforcement Response Plan-ERP) 26. Did you send a copy of the ERP to your industries? ® Yes ❑ No If no, POTW must send copy within 30 days. Sent 9-20-2021 27. Have you had any problems interpreting or enforcing any part of the ERP (i.e. any adjudication, improper enforcement, etc? ❑ Yes ® No If yes, Explain. 28. List Industries under a Schedule or Order and Type of Schedule or Order N/A Resources 29. Please Rate the Followine: S=Satisfactory M=Marninal U=Unsatisfactor Rating Explanation, if Unsatisfactory Personnel Available for Maintaining POTW's Pretreatment Program 2 staff, 1 vacancy 0 S ❑M ❑U Access to POTW Vehicles for Sampling, Inspections, and Emergencies 1 Ford F150, 2 Ford Escapes 0 S ❑M ❑U Access to Operable Sampling Equipment 8 automatic samplers, 2 pH probes, 3 dippers 0 S ❑M ❑U Availability of Funds if Needed for Additional Sampling and/or Analysis Public Utilities has a budget for additional sampling/analysis needs. 0 S ❑M ❑U Reference Materials 2 copies of 40 CFR, 2 copies of NCPC training manuals plus other materials and access to search engines. Manuals are maintained for all equipment. 0 S ❑M ❑U Staff Training (i.e. Annual and Regional Workshops, Etc.) Both staff took Collections 1 this year. Plan to attend NCPC conference, possess grade 3 NCPC certification. /1S ❑M ❑U NC DWR Pretreatment Audit Form Revised: December 2016 Page 2 DocuSign Envelope ID: 6298500A-DAC7-44EE-850B-897FC729D1OD Computer Equipment (Hardware and Software) ®S ❑M ❑U 3 laptops + 2 screens each for each staff and the vacant position. 1 additional laptop for field use. 30. Does the POTW have an adequate data management system to run the pretreatment program? ® Yes ❑ No Explain Yes or No. Hach Water Information Management Solution (Hach WIMS) software, pretreatment software 31. How does the POTW recover the cost of the Pretreatment Program from their industries? Explain. Annual and administrative fees, permit application/modification fees help to offset the cost of the program. However, do not exact cost recovery for the entire program through direct fees and charges. The pretreatment program is an essential function of the POTW and is covered by the rate structure. Public Perception/ Participation 32. Are there any local issues affecting the pretreatment program (e.g.. odor, plant closing, new or proposed plants)? ® Yes ❑ No If yes, Explain. There was an odor complaint regarding the land application practices of one of our industries last year. 33. Has any one from the public ever requested to review pretreatment program files? ® Yes ❑ No If yes, Explain procedure. If no, how would the request be addressed? The person would make a written request and public data would be made available. POTW would confirm with the City's attorney. 34. Has any industry ever requested that certain information remain confidential from the public? ® Yes ❑ No If yes, Explain procedure for determining whether information qualified for confidential status, as well as procedure for keeping files confidential from public. If no how would the request be addressed? Effluent data cannot be kept confidential, but manufacturing processes or plans can be marked as confidential in the file and the information omitted from a request for information if appropriate. If there was a question POTW would ask the City's attorney. 35. In addition to annual inspection, does the POTW periodically meet with industries to discuss pretreatment? ® Yes ❑ No 36. Is the public notified about changes in the SUO or Local Limits? ® Yes ❑ No 37. Were all industries in SNC published in the last notice? ® Yes ❑ No Permitting (Industrial Waste Survey-IWS) 38. How does the POTW become aware of new or changed Users? Some industries call to report changed conditions or request Authorizations to Construct. New or changed Users are discovered during routine PCIs or during Industrial Waste Surveys. 39. Once the POTW becomes aware of new or changed Users, how does the POTW determine which industries have the reasonable potential to adversely impact the WWTP and therefore require a new permit or a permit revision? (Who is an SIU?) Requesting information about the discharged volume. Requesting SDSs for chemical ingredients or products. Collecting an effluent sample from the industry and analyzing for pH and suspected pollutants of concern. 40. Does the POTW receive waste from any groundwater remediation projects (petroleum, CERCLA) or landfill leachate? ®Yes ENo If Yes, How many are there? 3 Please list each site and how it is permitted, if applicable. North Wake Landfill, Wilders Grove Landfill, and NCSU Lot 86 are permitted as non-SIUs. Neuse River East Parallel Interceptor is permitted as a groundwater discharge permit for a short term construction project, <1 yr. 41. Does the POTW accept waste by (mark if applicable) ® Truck ❑Dedicated Pipe ❑ NA 42. If the POTW accepts trucked waste, what controls are placed on this waste? (example. designated point, samples drawn, manifests required) Designated discharge point, controlled discharge hours (8-4, M-F), 24-hour plant staffing, manifests required. POTW will likely implement a general permit for septage next year. 43. How does the POTW allocate its loading to industries? Mark all that apply ❑ Uniform Limits ® Historical Industry Need ❑ By Surcharge ® Categorical Limits ❑ Other Explain Other: 44. Review POTW's copies of current allocation tables for each WWTP. Are there any over allocations? ❑ Yes ® No NC DWR Pretreatment Audit Form Revised: December 2016 Page 3 DocuSign Envelope ID: 6298500A-DAC7-44EE-850B-897FC729D10D If yes, what parameters are over allocated? 45. If yes to #44, What is being done to address the over allocations? (short-term IUPs, HWA to be revised, pollutant study, etc.) 46. Does the POTW keep pollutant loading in reserve for future growth / safety? ® Yes ❑ No If yes, what percentage of each parameter No written policy % 47. Has the POTW experienced any difficulty in allocation? (for example: adjudication by an industry) ® Yes ❑ No If yes, Explain. Silver allocation issue resolved with WER study. 48. How does the POTW decide on which pollutants to limit in the permits? Monitor for? (for example: were only those pollutants listed on the application limited; categorical parameters; NPDES Pollutants of Concern) Categorical limits are used where applicable and appropriate. pH limits are assigned to be protective of our infrastructure. Flow limits are based upon historical industry need. Monitoring requirements are assigned based on historic observation/ industry need or upon the permit application. 49. How does the POTW decide what the monitoring frequency should be for the various pollutants in industry permits? Explain. In General, more frequent sampling is required of large industries because of their greater likelihood of impacting the POTW. More frequent sampling is also required of industries that have widely fluctuating data, especially if they are surcharged based on sampling data. Permit Compliance 50. Does the POTW currently have or during the past year had any permits under adjudication? ❑ Yes ® No If yes, which industries? What was (will be) the outcome of the adjudication? 51. Demonstrate how the POTW judges compliance. This should include compliance judgment on all violations of limits, reporting requirements, and permit conditions, as well as for SNC. Compliance is judged as data is entered each month. Entries are made into a record of permit non-compliance and violations, including late submittals. In general, follow-ups are made as data is entered. 52. Does the POTW use the Division's model inspection form or equivalent? ® Yes ❑ No If no, does the POTW form include all Division data? ❑ Yes ❑ No 53. Were all SIUs evaluated for the need of a slug/spill control plan during their most recent inspections? ® Yes ❑ No If no, Explain. In 2017, Slug Spill Plans were checked against the federal model to make sure SSP requirements were being met. During inspections POTW verifies that each industry has maintained their SSP. SPCCs or other qualifying plans are allowed to be used as an SSP if they meet the criteria. 54. What criteria are used to determine if a slug/spill control plan is needed? All industries are required to develop a slug/spill control plan. 55. What criteria does the POTW use to determine if a submitted slug/spill control plan is adequate? Comparison with federal guidelines 56. How does the POTW decide where the sample point for an SIU should be located? The sample point should be located where all process wastestreams can be captured in a representative way. Dilution water should be excluded from an SIU sampling point. Some SIUs have two sampling locations. 57. Has the POTW established a procedure to ensure that representative samples will be taken by the POTW or SIU each time? (example: correct location; proper programming of sampler; clean equipment; swirling the sample bucket uniformly) POTW: ❑ Yes ❑ No SIU: ❑ Yes ❑ No If yes, Explain. If an SIU is not in operation 24-hours per day, or is a batch discharger, POTW require the use of flow paced sampling. A sampling SOP was provided for metal finishers that use grab samples. An industry will be notified of any housekeeping issues by pretreatment staff. 58. Who performs sample analysis for the POTW for Metals NRRRF Laboratory Conventional Parameters NRRRF Laboratory Organics Wavpoint Laboratory Pace serves as our reserve laboratory if there are any issues with scheduling or equipment. 59. Explain the Chain of Custody Procedure used for both in house and commercial lab samples. NC DWR Pretreatment Audit Form Revised: December 2016 Page 4 DocuSign Envelope ID: 6298500A-DAC7-44EE-850B-897FC729D10D The personnel conducting the sampling complete the chain of custody and sign the samples over to NRRRF Laboratory personnel. NRRRF Laboratory prepares a second chain of custody for samples they have received that will be contracted with a different lab. Long/Short Term Monitoring Plan (L/STMP) and Headworks Analysis (HWA) 60a. Is LTMP/STMP Monitoring Being Conducted at Appropriate Locations and Frequencies? ® YES El NO 60b. Are Correct Detection Levels being used for all LTMP/STMP Monitoring? ® YES El NO 60c. Is LTMP/STMP Data Maintained in Table or Equivalent? ® YES El NO Is Table Adequate? El YES El NO 60d. All LTMP/STMP effluent data on Discharge Monitoring Report (DMR)? ® YES El NO Division Inspector, verify yourself! 60e. If NO to any above, list violations 60f. Should any Pollutants of Concern be Eliminated from or Added to LTMP/STMP? El YES ® NO If yes, which ones? Eliminated: Added: 61. Do you complete your own headworks analysis (HWA) ? ® Yes El No If no, who completes your HWA? Previous HWA completed by Ryan Faw, I will complete the next one Phone ( ) -- 62. Do you have plans to revise your HWA in the near future? El Yes ® No If yes, what is the reason for the revision? (mark all that apply) ❑Increased average flow ❑NPDES limits change ❑More LTMP data available ❑Resolve over allocation ®5 year expiration ❑Other Explain. 63. In general, what is the most limiting criteria of your HWA? ❑Inhibition ® Pass Through El Sludge Quality 64. Do you see any way to increase your loading in the future (Example: obtaining more land for sludge disposal)? ® Yes El No Explain. Loading will be increased with next upgrade. 75MGD upgrade was complete in 2018. Already in planning for next upgrades. City Engineer does modeling for both short term and long term loading, which helps with long range planning. All final sludge will be Class A that does not require land application. Summary 65. Do you plan any significant changes to the pretreatment program or changes to the WWTP that may affect pretreatment? POTW are attempting to reclassify our Utilities Specialist positions to Senior Utilities Specialists for the purpose of staff retention and ability to compensate for added responsibilities. POTW are beginning to survey for PFAS as part of our IWS. We are now implementing a year -long quarterly sampling initiative for PFAS to obtain baseline data for NRRRF and LCRRF as well as Smith Creek. Industrial Pretreatment will be taking over the septage receiving program at NRRRF. NC DWR Pretreatment Audit Form Revised: December 2016 Page 5 DocuSign Envelope ID: 6298500A-DAC7-44EE-850B-897FC729D1OD INDUSTRIAL USER PERMIT (IUP) FILE REVIEW (3 IUP FILE REVIEWS AND 1 IU INSPECTION) 66. User Name 1. Accu-Fab 2. Alsco 3. Ajinomoto 67. IUP Number AFAB SERV AJIN 68. Does File Contain Current Permit? 0 Yes ❑ No 0 Yes ❑ No A Yes ❑ No 69. Permit Expiration Date 12/31/2023 12/31/2023 12/31/2023 70. Categorical Standard Applied (I.E. 40 CFR, Etc.) Or N/A 433.A N/A 439.A 71. Does File Contain Permit Application Completed Within One Year Prior to Permit Issue Date? /1 Yes ❑ No /1 Yes ❑ No 0 Yes ❑ No 72. Does File Contain Inspection Completed Within Last Calendar Year? II Yes ❑ No /1 Yes ❑ No A Yes ❑ No 73. a. Does File Contain Slug/Spill Control Plan? b. If No, is One Needed? (See Inspection Form from POTW) a. ►Yes •No b. ■Yes ■No a. ►Yes •No b. •Yes ■No a. ►Yes •No b. •Yes ■No Certification, Does File Contain a Toxic (TOMP)? DYes❑No❑N/A ❑ Yes ❑No®N/A ❑Yes❑NoON/A 74. For 40 CFR 413 and 433 TTO Organic Management Plan 75. a. Does File Contain Original Permit Review Letter from Division? b. All Issues Resolved? a. ►Yes •No b.❑Yes❑No❑N/A a. Yes •No b.❑Yes❑No❑N/A a. ►Yes •No b.❑Yes❑No❑N/A 76. During Most Recent Semi -Annual Period, Did POTW Complete its Sampling as Required by IUP, including Flow? 0 Yes ❑ No /1 Yes ❑ No /1 Yes ❑ No 77. Does File Contain POTW Sampling Chain -Of -Custody Forms? Al Yes ❑ No /1 Yes ❑ No /1 Yes ❑ No 78. During Most Recent Semi -Annual Period, Did SIU Complete its Sampling as Required by IUP, including Flow? ®Yes❑No❑N/A ® Yes ❑No❑N/A ®Yes❑No❑N/A 79. During Most Recent Semi -Annual Period, Did SIU submit all reports on time? ®Yes❑No❑N/A ®Yes❑No❑N/A ®Yes❑No❑N/A 80a. For categorical IUs with Combined Wastestream Formula (CWF), does file include process/dilution flows as Required by IUP? ❑Yes❑NoON/A ❑ Yes ❑NoON/A ❑Yes❑NoON/A 80b. For categorical IUs with Production based limits, does file include production rates and/or flows as Required by IUP? ❑Yes❑No®N/A ❑ Yes ❑No®N/A ❑ Yes ❑NoON/A 81. During Most Recent Semi -Annual Period, Did POTW Identify All Limits Non -Compliance from Both POTW and SIU Sampling? ❑ Yes ❑NoON/A ❑ Yes ❑NoON/A ❑Yes❑NoON/A 82. During Most Recent Semi -Annual Period, Did POTW Identify All Reporting Non -Compliance from SIU Sampling? ❑Yes❑NoON/A ❑ Yes ❑No®N/A ❑Yes❑NoON/A 83. a. Was POTW Notified by SIU (Within 24 Hours) of All Self- Monitoring Violations? b. Did Industry Resample and submit results to POTW within 30 Days? c. If applicable, did POTW resample and obtain results within 30 days of becoming aware of SIU limit violations in the POTW's sampling of SIU? a.❑Yes❑NOON/A b.❑Yes❑No®N/A c.❑Yes❑No®N/A a.❑Yes ❑No®N/A b.❑Yes❑No®N/A c.❑Yes❑No®N/A a.❑Yes❑No®N/A b.❑Yes❑NOON/A c.❑Yes❑No®N/A 84. During Most Recent Semi -Annual Period, Was SIU in SNC? ❑ Yes i1 No ❑ Yes i1 No ❑ Yes A No 85. During Most Recent Semi -Annual Period, Was Enforcement Taken as Specified in POTW's ERP (NOVs, Penalties, timing, etc.)? ❑Yes❑No®N/A ❑Yes❑NoON/A ❑Yes❑NoNN/A 86. Does File Contain Penalty Assessment Notices? ❑Yes❑NoON/A ❑Yes❑No®N/A ❑Yes❑No®N/A 87. Does File Contain Proof Of Penalty Collection? ❑Yes❑NoNN/A ❑ Yes ❑No0N/A ❑Yes❑NoNN/A 88. a. Does File Contain Any Current Enforcement Orders? b. Is SIU in Compliance with Order? a.❑Yes❑No®N/A b.❑Yes❑No®N/A a.❑Yes ❑No®N/A b.❑Yes ❑NoEIN/A a.❑Yes❑No®N/A b.❑Yes❑No®N/A 89. Did POTW Representative Have Difficulty in Obtaining Any Requested Information For You? ❑ Yes I No ❑ Yes /1 No ❑ Yes 1 No FILE REVIEW COMMENTS: NC DWR Pretreatment Audit Form Revised: December 2016 Page 6 DocuSign Envelope ID: 6298500A-DAC7-44EE-850B-897FC729D10D INDUSTRY INSPECTION ICIS CODING: Main Program Permit Number MM/DD/YY INICIO 10 1 2 1 9 10 1 3 1 3 I 109 121 121 I 1. Industry Inspected: Accu-Fab 2. Industry Address: 801 Beacon Lake Dr., Raleigh, NC 27610 3. Type of Industry/Product: Metal finisher/Metal frames 4. Industry Contact: Sonya Walsh Title: EHS Officer Phone: Fax: 5. Does the POTW Use the Division Model Inspection Form or Equivalent? ® Yes ❑ No 6. Did the POTW Contact Conduct the Following Parts of the Industrial Inspection Thoroughly? Comments: A. Initial Interview B. Plant Tour C. Pretreatment Tour D. Sampling Review E. Exit Interview Industrial Inspection Comments: ® Yes ® Yes ® Yes ® Yes ® Yes ❑ No ❑ No ❑ No ❑ No ❑ No POTW representative conducted a thorough inspection. Audit SUMMARY AND COMMENTS: Audit Comments: The program is well managed. Requirements: None Recommendations: None NOD: ❑ Yes NOV: ❑ Yes QNCR: ❑ Yes POTW Rating: ® No ® No ® No Satisfactory Marginal ❑ Unsatisfactory ❑ Audit COMPLETED BY: Cheng Zhang, Raleigh Regional Office DATE: 9/21/2021 NC DWR Pretreatment Audit Form Revised: December 2016 Page 7