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Home My WebLink AboutNC0025071_Compliance Evaluation Inspection Report_20171220Water Resources Environmental Quality Mr. Brad Corcoran, City Manager City of Eden PO Box 70 Eden, NC 27289-0070 Subject: Compliance Evaluation Inspection Report NPDES Permit NCO025071 Mebane Bridge WWTP, Rockingham County Dear Mr. Corcoran: ROY COOPER Governor MICHAEL S. REGAN Secretary LINDA CULPEPPER Interim Director December 20, 2017 ftcle/VIS®/ 8 DFC 2 ��Ri��J � 1I �ept�7N 9 Ou'96rees tion On December 13, 2017, Paul DiMatteo and Jim Gonsiewski of the Division of Water Resources ("Division"), Winston-Salem Regional Office conducted a Compliance Evaluation Inspection of the above referenced wastewater treatment system. The presence and cooperation of Ms. Melinda Ward and Mr. Chris Powell was greatly appreciated. This type of inspection consists of two basic parts: an on-site inspection of the facility and a review of facility files and self-monitoring data. Observations from each area of the inspection are summarized below. Site Review 1. Permit The current permit became effective on March 1, 2015 and expires on April 30, 2018. A permit renewal application was received by the Division on November 1, 2017. A copy of the current permit was available for review. Permitted components include bar screens, two aeration basins, four clarifiers, gas chlorine disinfection and dechlorination. 2. Facility Site Review The facility was as described in the permit, and is operated 24 hours per day, 7 days per week. At the time of inspection, the two larger clarifiers and one aeration basin were offline due to prolonged low flows. The operators said that an emergency generator at the nearby water treatment plant is capable of powering both facilities. 3. Operation and Maintenance Melinda Ward is the current Operator in Responsible Charge, and Chris Powell, Glenn Pulliam and Ronald Wright are backup ORCs. All operators are properly designated and hold the correct credentials. The facility was very clean at the time of the inspection and appeared to be well operated and managed. -51 -'Nothing Compares_�____ State of North Carolina I Environmental Quality 450 W Hanes Mill Road, Suite 300, Winston-Salem, North Carolina 27105 Phone: 336-776-98001 FAX 336-776-9797 4. Flow Measurement Influent flow is measured using an ultrasonic device set above a stilling well located next to a Parshall flume. The flume is completely covered with a grate except for a section above the stilling well. The stilling well appeared to be located next to the throat of the flume. The reading from the stilling well should be checked against the standard measurement location to ensure that reported flow is within 10% of the true value. The ultrasonic device's calibration was last checked on November 22, 2017 by Instrumentation Services, Inc., and is usually checked quarterly. 5. Effluent/Receiving Waters The effluent is discharged to the Dan River, Class WS -IV waters in the Roanoke River Basin. The outfall was not observed during the inspection due to accessibility issues. Documentation Review 6. Records/Reports Discharge Monitoring Reports (DMRs) and lab data are maintained according to the permit. DMRs include all permit parameters. Copies of DMRs, operator visitation logs, daily operation sheets, maintenance reports, lab reports and Chain -of -Custody forms were available for review during the inspection. 7. Self -Monitoring Program A review of DMRs from August, 2016 through October, 2017 showed no violations, and a comparison of submitted DMR data with bench records showed no errors or concerns. 8. Laboratory The facility analyzes TSS, fecal coliform, pH, temperature, and DO under certification #168. Other parameters are analyzed by Pace Analytical. Copies of all laboratory documentation are kept on site. Procedures for analyzing field parameters appeared acceptable. Composite samplers are programmed to be time -proportional (one aliquot every 15 minutes). Please note that item (4) under the definition of "Composite Sample," Permit Part II Section A states that use of constant time,tconstant volume composite sampling requires prior approval by the Director and may only be used in certain circumstances. Otherwise, sampling should be flow - proportional. 9. Sludge Handling Disposal Sludge is currently held in an aerated basin until it is hauled off site for further processing. The operators said that the facility was planning on overhauling its sludge handling processes. We appreciate the efforts made to effectively operate and maintain this treatment facility. If you should have any questions, please do not hesitate to contact Paul DiMatteo at (336) 776-9691 or our office at (336) 776-9800. Sincerely, fflm��MM Sherri V. Knight, P.E., Regional Supervisor Water Quality Regional Operations Section Winston-Salem Regional Office Division of Water Resources, NCDEQ Enclosures —Inspection Report and Summary CC: WQS Winston-Salem Regional Office - Enforcement File NPDES Compliance/Enforcement Unit - Enforcement File Central Files 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 'r 1 I 2 I. 1 3 I NCO025071 I11 12 17/12/13 17 18 l C l 19 l S l 20I -166 2111111111111111 1 11111111111111111111111111 1 l —Reserved Inspection Work Days Facility Self -Monitoring Evaluation Rating B1 QA ---Reserved- 67 70 IJ 71I 72 Lti_I I I I 73I l X74 75 III I I 80 671 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) 12 30PM 17/12/13 15/03/01 Mebane Bridge WWTP 204 Mebane Bridge Rd Exit Time/Date Permit Expiration Date Eden NC 27288 • 02 30PM 17/12/13 18/04/30 Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s) Other Facility Data Melinda Sessoms Ward/ORC/336-627-1009/ Name, Address of Responsible Official/Title/Phone and Fax Number Contacted Brad Corcoran,PO Box 70 Eden NC 272890070/City Yes Manager/336-623-2110/3366232726 Section C Areas Evaluated During Inspection (Check only those areas evaluated) Permit N Flow Measurement Operations & Maintenance Records/Reports Self -Monitoring Program N Sludge Handling Disposal Facility Site Review Laboratory 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 Jim J Gonsiewski Division of Water Quality//336-776-97041 Paul DiMa�WSRO WQ//336-776-9691/ T r iix� 1L 2b1�c't Signature off Man-agementQ AA Relvie'wer Agency/Office/Phone and Fax Numbers Date � 7 v EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete Page# NPDES yr/mo/day I Inspection Type (Cont.) 1 31 NC0025071 I11 12 17/12/13 j 17 I 18 I S I Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) Site Review 1. Permit The current permit became effective on March 1, 2015 and expires on April 30, 2018. A permit renewal application was received by the Division on November 1, 2017. A copy of the current permit was available for review Permitted components include bar screens, two aeration basins, four clarifiers, gas chlorine disinfection and dechlorinatil n. 2. Facility Site Review The facility was as described in the permit, and is operated 24 hours per day, 7 days per week. At the time of inspection, the two larger clarifiers and one aeration basin were offline due to prolonged low flows. The operators said that an emergency generator at the nearby water treatment plant is capable of powering both facilities. I 3. Operation and Maintenance Melinda Ward is the current Operator in Responsible Charge, and Chris Powell, Glenn Pulliam and Ronald Wright are backup ORCs. All operators aIre properly designated and hold the correct credentials. The facility was very clean at the time of the inspection and appeared to be well operated and managed. I 4. Flow Measurement Influent flow is measured using an ultrasonic device set above a stilling well located next to a Parshall flume. The flume is completely covered with a grate except for a section above the stilling well. The stilling well appeared to be located next to the throat of the flume The reading from the stilling well should be checked against the standard measurement location to ensure that reported flow is within 10% of the true value. The ultrasonic device's calibration was last checked on November 22, 2017 by Instrumentation Services, Inc., and is usually checked quarterly. 5 Effluent/Receiving Waters The effluent is discharged to the Dan River, Class WS -IV waters in the Roanoke River Basin. The outfall was not observed during the inspection due to accessibility issues. Documentation Review 6 Records/Reports Discharge Monitoring Reports (DMRs) and lab data are maintained according to the permit. DMRs include all permit parameters Copies of DMRs, operator visitation logs, daily operation sheets, maintenance reports, lab reports and Chain -of -Custody forms were available for review during the inspection. 7. Self -Monitoring Program A review of DMRs from August, 2016 through October, 2017 showed no violations, and a comparison of submitted DMR data with bench recordslshowed no errors or concerns. 8. Laboratory The facility analyzes TSS, fecal coliform, p�, temperature, and DO under certification #168. Other parameters are analyzed by Pace Analytical. Copies of all laboratory documentation are kept on site. Procedures for analyzing field parameters lappeared acceptable. Composite samplers are programmed to be time -proportional (one aliquot every 15 minutes). Please note that item (4) under the definition of "Composite Sample," Permit Part II Section A states that use of constant time/constant volume composite1sampling requires prior approval by the Director and may only be used in certain circumstances. Otherwise, sampling should be flow -proportional. 9 Sludge Handling Disposal Sludge is currently held in an aerated basin until it is hauled off site for further processing. The operators said that the facility was planning on overhauling its sludge handling processes Page# 2 Permit. NCO025071 Owner - Facility: Mebane Bridge WWTP Inspection Date: 12/13/2017 Inspection Type- Compliance Evaluation Operations & Maintenance Yes No NA NE Is the plant generally clean with acceptable housekeeping? N ❑ ❑ ❑ Does the facility analyze process control parameters, for ex MLSS, MCRT, Settleable 0111111 Solids, pH, DO, Sludge Judge, and other that are applicable? Comment: Permit Yes No NA NE (If the present permit expires in 6 months or less). Has the permittee submitted a new ❑ ❑ ❑ ❑ application? 0 ❑ ❑ ❑ Is the facility as described in the permit? 0 ❑ ❑ ❑ # Are there any special conditions for the permit? ❑ N ❑ ❑ Is access to the plant site restricted to the general public? 0 ❑ ❑ ❑ Is the inspector granted access to all areas for inspection? N ❑ ❑ ❑ Comment: Record Keeping Yes No NA NE Are records kept and maintained as required by the permit? 0 ❑ ❑ ❑ Is all required information readily available, complete and current? 0 ❑ ❑ ❑ Are all records maintained for 3 years (lab. reg required 5 years)? N ❑ ❑ ❑ 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 CDCs Are DMRs complete- do they include all permit parameters? ❑ ❑ ❑ Has the facility submitted its annual compliance report to users and DWQ? 0 ❑ ❑ ❑ (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? 0 ❑ ❑ ❑ Is the ORC certified at grade equal to or higher than the facility classification? 0 ❑ ❑ ❑ Is the backup operator certified at one grade less or greater than the facility classification? 0 ❑ ❑ ❑ Is a copy of the current NPDES permit available on site? 0 ❑ ❑ ❑ Page# 3 Permit NC0025071 Owner -Facility. Mebane Bndge WWTP Inspection Date- 12/13/2017 Inspection Type- Compliance Evaluation Record Keeping Yes No NA NE Facility has copy of previous year's Annual Report on file for review? M ❑ ❑ ❑ Comment. Flow Measurement - Influent Yes No NA NE # Is flow meter used for reporting? N ❑ ❑ ❑ Is flow meter calibrated annually? 0 ❑ ❑ ❑ Is the flow meter operational? N ❑ ❑ ❑ (If units are separated) Does the chart recorder match the flow meter? ❑ ❑ 0 ❑ Comment. Aerobic Digester Yes No NA NE Is the capacity adequate? N ❑ ❑ ❑ Is the mixing adequate? N ❑ ❑ ❑ Is the site free of excessive foaming in the tank? 0 ❑ ❑ ❑ # Is the odor acceptable? N ❑ ❑ ❑ # Is tankage available for properly waste sludge? 0 ❑ ❑ ❑ Comment: 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? M ❑ ❑ ❑ Is the unit in good condition? N ❑ ❑ ❑ Comment: There are 5 bar screens on site Two are located near the influent, before grit removal Two were placed at the end of the aeration basins because they were having issues with smaller debris getting through the Initial screens and accumulating into larger masses In the aeration basin The use of these bar screens is being phased out. A newer, fine bar screen was installed after the initial bar screens, which the operators said has greatly helped the accumulation issue. Grit Removal Type of grit removal Yes No NA NE Page# 4 e permit- NCO025071 Owner- Facility. Mebane Bridge WWTP Surface Inspection Date, 12/13/2017 Inspection Type Compliance Evaluation ■ ❑ Grit Removal Yes No NA NE a.Manual ❑ 1:1 El 1:1 b.Mechanical 0 E Is the grit free of excessive organic matter? ❑ ❑ ❑ Is the grit free of excessive odor? 0 ❑ ❑ ❑ # Is disposal of grit in compliance? N ❑ ❑ ❑ Comment: Secondary Clarifier 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? 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? Is the return rate acceptable (low turbulence)? Is the overflow clear of excessive solids/pin floc? Is the sludge blanket level acceptable? (Approximately V4 of the sidewall depth) Yes No NA NE ■ ❑ 111:1 N ❑ 111:1 N ❑ 111:1 ■ ❑ 111:1 ■ ❑ ❑ ❑ N ❑ ❑ ❑ N ❑ ❑ ❑ ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ❑ ❑ ❑ ■ Comment: The two larger clarifiers are out of service due to prolonged low flow. Operators said they usually try to keep the sludge blanket to about 2 feet Aeration Basins Mode of operation Type of aeration system 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) Yes No NA NE 6d. Air Surface ■ ❑ ❑ ❑ 0 E 1:1 El 1:1 El 0 E ❑ ❑ ❑ ■ Page# 5 Permit NCO025071 j Owner - Facility- Mebane Bridge WWTP Compliance Evaluation Inspection Date- 12/13!2017 Inspection Type- Com P Yes No NA NE Type of system ? Liquid ❑ Aeration Basins ! Yes No NA NE Comment One aeration basin is out of service due to prolonged low flows. The operators said that ❑ ❑ Is storage appropriate for cylinders? water could directed to the out of service basin during high flow so that It can act as an ❑ ❑ # Is de -chlorination substance stored away from chlorine containers? equalization basin. ❑ ❑ ❑ ❑ Disinfection -Gas i Yes No NA NE Are cylinders secured adequately? E ❑ ❑ ❑ Are cylinders protected from direct sunlight? ❑ ❑ ❑ Is there adequate reserve supply of disinfectant? j ❑ ❑ ❑ Is the level of chlorine residual acceptable? I E ❑ ❑ ❑ Is the contact chamber free of growth, or sludge buildup? 0 ❑ ❑ ❑ Is there chlorine residual prior to de -chlorination? ❑ ❑ ❑ 0 Does the Stationary Source have more than 2500 Ills of Chlorine (CAS No. 7782-50-5)9 ❑ ❑ ❑ E If yes, then is there a Risk Management Plan on site? I ❑ ❑ ❑ If yes, then what is the EPA twelve digit ID Numbet? (1000- -___) If yes, then when was the RMP last updated? i Comment: De -chlorination Yes No NA NE Type of system ? Liquid ❑ ❑ Is the feed ratio proportional to chlorine amountl(1 to 1)? ❑ ❑ ❑ Is storage appropriate for cylinders? 0 ❑ ❑ ❑ # Is de -chlorination substance stored away from chlorine containers? N ❑ ❑ ❑ Comment: Are the tablets the proper size and type? ❑ ❑ N ❑ Are tablet de -chlorinators operational? ❑ ❑ 0 ❑ Number of tubes in use? Comment: Laboratory I Yes No NA NE Are field parameters performed by certified personnel or laboratory? I 0 ❑ ❑ ❑ Are all other parameters(excluding field parameters) performed by a certified lab? 0 ❑ ❑ ❑ # Is the facility using a contract lab? j 11M 11 E]# Is proper temperature set for sample storage (kept at less than or equal to 6 0 degrees ❑ ❑ ❑ 0 Celsius)? Page# 6 permit- NCO025071 Owner - Facility: Mebane Bridge WWTP Inspection Date: 12/13/2017 Inspection Type- Compliance Evaluation Laboratory Yes No NA NE Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees? 0 ❑ ❑ ❑ Incubator (BOD) set to 20.0 degrees Celsius +/-1.0 degrees? ❑ ❑ ❑ 0 Comment: Analyze TSS, fecal coliform. PH, temp, and DO on site The rest is sent to Pace Analytical. Influent Sampling Yes No NA NE # Is composite sampling flow proportional? ❑ N ❑ ❑ Is sample collected above side streams? 0 ❑ ❑ ❑ Is proper volume collected ❑ ❑ ❑ ❑ Is the tubing clean? 0 ❑ ❑ ❑ # Is proper temperature set for sample storage (kept at less than or equal to 6 0 degrees ❑ ❑ ❑ 0 Celsius)? Is sampling performed according to the permit? ❑ ❑ ❑ Comment: Operators reported that the night before the inspection their influent composite sampler had somehow broken They were compositing by hand while the sampler was being repaired. Comment The sampler collected a 110 ml aliquot during Inspection. The repair was expected to be completed that day. Thermometer in refrigerator read <6.0 C. Effluent Sampling Yes No NA NE Is composite sampling flow proportional? ❑ 0 ❑ ❑ Is sample collected below all treatment units? 0 ❑ ❑ ❑ Is proper volume collected? N ❑ ❑ ❑ Is the tubing clean? N ❑ ❑ ❑ # Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees 0 ❑ ❑ ❑ Celsius)? Is the facility sampling performed as required by the permit (frequency, sampling type ❑ ❑ ❑ representative)? Comment The sampler collected a 110 ml aliquot during Inspection. Thermometer in refrigerator read <6.0 C. Operators reported that sampler is set to grab an aliquot every 15 minutes Upstream / Downstream Sampling Yes No NA NE Is the facility sampling performed as required by the permit (frequency, sampling type, and ❑ ❑ ❑ sampling location)? Comment Page# 7