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Home My WebLink AboutWQ0021828_Compliance Evaluation Inspection_20220926 Certified Mail # 7020 3160 0000 2219 4515 Return Receipt Requested September 26, 2022 Monica S Dodson Orange Water and Sewer Authority 400 Jones Ferry Road Carrboro, NC 27510-2001 SUBJECT: Compliance Inspection Report OWASA DCAR Non-discharge Permit No. WQ0021828 Orange County Dear Permittee: The North Carolina Division of Water Resources conducted an inspection of the OWASA DCAR on 8/22/2022. This inspection was conducted to verify that the facility is operating in compliance with the conditions and limitations specified in Non-discharge Permit No. WQ0021828. The findings and comments noted during this inspection are provided in the enclosed copy of the inspection report entitled "Compliance Inspection Report". The facility continues operation of a residuals management program for Orange Water and Sewer Authority and consisting of the distribution of Class A residuals generated by the facility. The facility (Mason Farm Wastewater Treatment Plant) Anaerobic Digestion Process provides treatment for both primary and waste activated sludges in a four-stage digestion process. The four anaerobic digestion tanks provide approximately 1,800,000 gallons of digestion capacity and are operated in a series. Normally, the first three anaerobic digesters are maintained in the thermophilic temperature range, in excess of 125° F and the fourth anaerobic digester is operated in the mesophilic temperature range, less then 115° Fahrenheit. The average temperature and time for biosolids processed through the Class A thermophilic process was 139.3° F and 28 hours. The digester operation - temperatures, recirculation and mixing rates are monitored continuously, in addition to gas production. The process control testing (VA/ALK ratios, pH and alkalinity, etc.) is checked routinely. Transfers into and out of the various digester tanks are monitored and recorded. The facility was well maintained, safety measures were in place, required documents and records were easily found. The residuals were not being land applied at the time of the inspection. No significant issues or findings were noted during the inspection. Therefore, a response to this inspection report is not required. DocuSign Envelope ID: 3608D8B7-0132-40A1-A20F-D57AFC01991C If you should have any questions, please do not hesitate to contact Dorothy Robson with the Water Quality Regional Operations Section in the Raleigh Regional Office at 919-791-4200 or via email at dorothy.robson@ncdenr.gov. Sincerely, Vanessa E Manuel, Assistant Regional Supervisor Water Quality Regional Operations Section Raleigh Regional Office Division of Water Resources, NCDEQ ATTACHMENTS: Compliance Inspection Form Cc: NON-DISCHARGE Laserfiche DocuSign Envelope ID: 3608D8B7-0132-40A1-A20F-D57AFC01991C Compliance Inspection Report Permit:WQ0021828 Effective:02/01/18 Expiration:01/31/23 Owner :Orange Water and Sewer Authority SOC: Contact Person: Region: County: Directions to Facility: Orange Raleigh Monica S Dodson Effective:Expiration:Facility:OWASA DCAR 400 Jones Ferry Rd Carrboro NC 275100366 Title:Phone:919-537-4205 Secondary ORC(s): Phone:Certification:Primary ORC: System Classifications: On-Site Representative(s): Related Permits: NC0025241 Orange Water and Sewer Authority - Mason Farm WWTP Secondary Inspector(s): Primary Inspector: Inspection Date:Exit Time:Entry Time: Phone: 08/22/2022 09:30AM 11:00AM Dorothy M Robson 919-791-4241 Facility Status: Permit Inspection Type: Reason for Inspection:Inspection Type: Not CompliantCompliant Routine Distribution of Residual Solids (503) Compliance Evaluation Question Areas: Miscellaneous Questions Record Keeping Treatment Pathogen and Vector Attraction Storage (See attachment summary) Page 1 of 4 DocuSign Envelope ID: 3608D8B7-0132-40A1-A20F-D57AFC01991C Inspection Date: Permit: Inspection Type : Owner - Facility: Reason for Visit: WQ0021828 08/22/2022 Compliance Evaluation Orange Water and Sewer Authority Routine Inspection Summary: The facility continues operation of a residuals management program for Orange Water and Sewer Authority and consisting of the distribution of Class A residuals generated by the facility. The facility (Mason Farm Wastewater Treatment Plant) Anaerobic Digestion Process provides treatment for both primary and waste activated sludges in a four-stage digestion process. The four anaerobic digestion tanks provide approximately 1,800,000 gallons of digestion capacity and are operated in a series. Normally, the first three anaerobic digesters are maintained in the thermophilic temperature range, in excess of 125° F and the fourth anaerobic digester is operated in the mesophilic temperature range, less then 115° Fahrenheit. The average temperature and time for biosolids processed through the Class A thermophilic process was 139.3° F and 28 hours. The digester operation - temperatures, recirculation and mixing rates are monitored continuously, in addition to gas production. The process control testing (VA/ALK ratios, pH and alkalinity, etc.) is checked routinely. Transfers into and out of the various digester tanks are monitored and recorded. The facility was well maintained, safety measures were in place, required documents and records were easily found. The residuals were not being land applied at the time of the inspection. No significant issues or findings were noted during the inspection. Therefore, a response to this inspection report is not required. Page 2 of 4 DocuSign Envelope ID: 3608D8B7-0132-40A1-A20F-D57AFC01991C Inspection Date: Permit: Inspection Type : Owner - Facility: Reason for Visit: WQ0021828 08/22/2022 Compliance Evaluation Orange Water and Sewer Authority Routine Type Yes No NA NE Land Application Distribution and Marketing Record Keeping Yes No NA NE Is GW monitoring being conducted, if required? Are GW samples from all MWs sampled for all required parameters? Are there any GW quality violations? Is GW-59A certification form completed for facility? Is a copy of current permit on-site? Are current metals and nutrient analysis available? Are nutrient and metal loading calculating most limiting parameters? a. TCLP analysis? b. SSFA (Standard Soil Fertility Analysis)? Are PAN balances being maintained? Are PAN balances within permit limits? Has land application equipment been calibrated? Are there pH records for alkaline stabilization? Are there pH records for the land application site? Are nutrient/crop removal practices in place? Do lab sheets support data reported on Residual Analysis Summary? Are hauling records available? Are hauling records maintained and up-to-date? # Has permittee been free of public complaints in last 12 months? Has application occurred during Seasonal Restriction window? Comment: Pathogen and Vector Attraction Yes No NA NE a. Fecal coliform SM 9221 E (Class A or B) Class A, all test must be <1000 MPN/dry gram Geometric mean of 7 samples per monitoring period for class B<2.0*10E6 CFU/dry gram Fecal coliform SM 9222 D (Class B only) Geometric mean of 7 samples per monitoring period for class B<2.0*10E6 CFU/dry gram b. pH records for alkaline stabilization (Class A) c. pH records for alkaline stabilization (Class B) Temperature corrected d. Salmonella (Class A, all test must be < 3MPN/4 gram day) Page 3 of 4 DocuSign Envelope ID: 3608D8B7-0132-40A1-A20F-D57AFC01991C Inspection Date: Permit: Inspection Type : Owner - Facility: Reason for Visit: WQ0021828 08/22/2022 Compliance Evaluation Orange Water and Sewer Authority Routine e. Time/Temp on: Digester (MCRT) Compost Class A lime stabilization f. Volatile Solids Calculations g. Bench-top Aerobic/Anaerobic digestion results Comment: Treatment Yes No NA NE Check all that apply Aerobic Digestion Anaerobic Digestion Alkaline Pasteurization (Class A) Alkaline Stabilization (Class B) Compost Drying Beds Other Comment: Page 4 of 4 DocuSign Envelope ID: 3608D8B7-0132-40A1-A20F-D57AFC01991C