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Home My WebLink AboutNC0081426_Compliance Evaluation Inspection_20170501Water Resources ENVIRONMENTAL QUALITY May 1, 2017 Mr. Steven Drew, Director Water Resources Department City of Greensboro P.O. Box 3136 Greensboro, NC 27402-3136 SUBJECT: Compliance Evaluation Inspection N.L. Mitchell WTP Discharge — City of Greensboro NPDES Permit No. NCO081426 Guilford County Dear Mr. Drew: ROY COOPER Governor MICHAEL S. REGAN Secretary S. JAY ZIMMERMAN Director RECEIVEDINCDEOIDWR;4',", MAY 0 9 , 2017 Water Quality Permitting Section, On April 20, 2017, Min Xiao of this office met with Dell Harney, Larry Nance, and Marie Shandor to perform a Compliance Evaluation Inspection on the NPDES wastewater discharge from the Mitchell Water Treatment Plant (WTP). The inspection findings are detailed below and an inspection checklist is attached. I. Permit The previous NPDES permit expired on June 30, 2016. The renewal permit became effective April 24, 2017, and will expire at midnight on June 30, 2021. H. Self -Monitoring Program The plant upgrading started from December, 2014 Due to the construction, instead of direct discharging, the effluent has drained to the sanitary sewer line connected to T.Z. Osborne WWTP since May, 2015. TSS, pH, TRC, and Turbidity were measured on-site, the other parameters were tested by Meritech lab. III. Flow Measurement The NPDES permit requires continuous flow recording and annual calibration of the flow measuring device When discharging, the daily effluent flow values reported on the DMRs are measured using an in-line totalizing meter on the decant line. This meter is calibrated every six months by city staff. A new meter was installed to replace the old one. IV. Sludge Handling and Disposal When the facility is discharging to surface waters, the solids collected in the settling basin/waste clarifier are removed on a daily basis and pumped directly to the Greensboro North Buffalo POTW. V. Operations and Maintenance Construction is currently underway at the Mitchell WTP to upgrade the water treatment facility. It is expected that the discharge to surface waters will commence again once this project is closer to completion. City of Greensboro Water Resources Department was discussing different plans for clarifier upgrading. A new clarifier might be added to the plant. State of North Carolina I Environmental Quality I Water Resources 450 West Hanes Mill Road, Suite 300, Winston-Salem, NC 27105 Phone 336-776-98001 Intemet www ncdenr gov VI. Facility Site Review The treatment components for the filter backwash wastewater consist of the following: a transfer basin with three pumps, dechlorination using calcium thiosulfate, a single settling basin/waste clarifier with four floating decanters and a water spray pump for chlorine dissipation, in-line totalizing flow meter and effluent discharge line VII. Effluent/Receiving Waters The system discharges into North Buffalo Creek, class "WS -V, NSW" waters in the Cape Fear River Basin. As noted previously, no discharge has occurred since May, 2015. Should you have any questions concerning this report, please contact Min Xiao or me at (336) 776-9800. Sincerely, hr Sherri V. Knight, PE Regional Supervisor Water Quality Regional Operations Section Division of Water Resources cc: Larry Nance (larry.nance@greensboro-nc.gov) Marie Shandor (marie.shandor@greensboro-nc.gov) Central Files NPDES Unit WSRO 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 I 2 15 I 3 I NCO081426 I11 12 17/04/20 J17 18Ij I 19I G I 201 I 211111 I I I I I III I I I I I III I I I I I I I I I I I I I I III I 11 11_J6 Inspection Work Days Facility Self -Monitoring Evaluation Rating B1 QA -------------------Reserved-------------- 72 I N I 7374 751 67 701 I 71 � L LJ J I I I I I I 180 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) 10 OOAM 17/04/20 11/08/01 N L Mitchell WTP 1041 Battleground Ave Exit Time/Date Permit Expiration Date Greensboro NC 274088322 12 30PM 17/04/20 16/06/30 Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s) Other Facility Data /// Larry S Nance/ORC/336-373-7660/ Name, Address of Responsible Official/Title/Phone and Fax Number Contacted Barry K Parsons,PO Box 3136 Greensboro NC 274023136/!336-373-7643! Yes Section C Areas Evaluated During Inspection (Check only those areas evaluated) Permit E Flow Measurement Operations & Maintenar N Records/Reports Self -Monitoring Progran 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 Min Xiao WSRO WQ//336769800/ / Signature f 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 31 NCO081426 I11 1 17/04/20 17 18I Section D Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) Page# i Permit: NCO081426 Owner - Facility: N L Mitchell WTP Inspection Date: 04/20/2017 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 E ❑ ❑ ❑ application? ❑ Is all required information readily available, complete and current? N ❑ Is the facility as described in the permit? 0 ❑ ❑ ❑ # Are there any special conditions for the permit? ❑ 0 ❑ ❑ Is access to the plant site restricted to the general public? 0 ❑ ❑ ❑ Is the inspector granted access to all areas for inspection? 0 ❑ ❑ ❑ Comment The previous NPDES permit expired on June 30, 2016 The renewal permit became effective April 24, 2017, and will expire at midnight on June 30, 2021. 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? N ❑ ❑ ❑ Are all records maintained for 3 years (lab reg required 5 years)? 0 ❑ ❑ ❑ Are analytical results consistent with data reported on DMRs? 0 ❑ ❑ ❑ Is the chain -of -custody complete? ❑ ❑ 0 ❑ 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? 0 ❑ ❑ ❑ 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 operato ❑ ❑ 0 ❑ on each shift? Is the ORC visitation log available and current? N ❑ ❑ ❑ Is the ORC certified at grade equal to or higher than the facility classification? E ❑ ❑ ❑ Is the backup operator certified at one grade less or greater than the facility classification' S ❑ ❑ ❑ Is a copy of the current NPDES permit available on site? N ❑ ❑ ❑ Facility has copy of previous year's Annual Report on file for review? ❑ ❑ N ❑ Comment. Operations & Maintenance Yes No NA NE Is the plant generally clean with acceptable housekeeping? 0 ❑ ❑ ❑ Page# 3 Permit: NCO081426 Owner - Facility: N L Mitchell wTP Inspection Date: 04/20/2017 Inspection Type: Compliance Evaluation Operations & Maintenance Yes No NA NE Does the facility analyze process control parameters, for ex MLSS, MCRT, Settleable ❑ ❑ 0 ❑ Solids, pH, DO, Sludge Judge, and other that are applicable? Comment. Construction is currently underway at the Mitchell WTP to upgrade the water treatment facility It is expected that the discharge to surface waters will commence again once this prosect is closer to completion. De -chlorination Yes No NA NE Type of system ? Liquid Is the feed ratio proportional to chlorine amount (1 to 1)? ❑ 0 ❑ ❑ Is storage appropriate for cylinders? ❑ ❑ 0 ❑ # Is de -chlorination substance stored away from chlorine containers? ❑ ❑ 0 ❑ Comment: Calcium thiosulfate is added at the transfer basin. The feed rate is controlled manually. Are the tablets the proper size and type? ❑ ❑ 0 ❑ Are tablet de -chlorinators operational? ❑ ❑ N ❑ Number of tubes in use? Comment. Flow Measurement - Effluent Yes No NA NE # Is flow meter used for reporting? E ❑ ❑ ❑ Is flow meter calibrated annually? 0 ❑ ❑ ❑ Is the flow meter operational? N ❑ ❑ ❑ (If units are separated) Does the chart recorder match the flow meter? ❑ ❑ E ❑ Comment: When discharging, the daily effluent flow values reported on the DMRs are measured using an in-line totalizing meter on the decant line. Effluent Pipe Yes No. NA NE Is right of way to the outfall properly maintained? 0 ❑ ❑ ❑ Are the receiving water free of foam other than trace amounts and other debris? ❑ ❑ 0 ❑ If effluent (diffuser pipes are required) are they operating properly? ❑ ❑ N ❑ Comment: No discharge has occurred since May. 2015 due to construction. Page# 4 r