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Home My WebLink AboutNC0081621_Review of Plant Upset_20170720Water Resources Environmental Quality July 20, 2017 Mr Timothy Mauldin Waste Water Operations Manager Water & Sewer Authority of Cabarrus County Post Office Box 428 Concord, North Carolina 28086 SUBJECT: Review of Plant Upset Muddy Creek WWTP NPDES Permit NCO081621 Cabarrus County, NC Dear Mr Mauldin ROY COOPER Governor MICHAEL S. REGAN Secretary S. JAY ZIMMERMAN Director RECEIVEMCDEWWR AUG -1 2017 Water Quality Permitting Section On July 14, 2017, at 11 17 a.m this Office received a phone call from Ms Kim Holt (ORC) to report plant upset of biological treatment at Muddy Creek Wastewater Treatment facility. The plant upset was investigated by Roberto Scheller of this Office on July 17, 2017 During the on-site visit a 30 -minute settability test and microscopic examination of Mix Liquors Suspended Solids (MLSS) was conducted Test indicated that the biological process appeared to be recovering from upset It was noted that Ms. Holt is very knowledgeable of treatment plant operations and biological treatment processes Due to Ms Holt's quick response to plant upset the treatment process appeared to be recovering quickly This Office recommends that commercial and industrial users of the collection system be visited to determine source of plant upset Collection system users should be reminded that unused and/or outdated chemicals and cleaning products should be disposed of properly The enclosed report should be self-explanatory; however, should you have any questions, please do not hesitate to contact myself or Roberto Scheller at (704) 235-2204 or roberto.scheller@ncdenr gov Enclosed CC. Wastewater Branch File rls Sincerely, a 1=v�- W Corey Basinger, Regional Supervisor Water Quality Regional Operations Section Division of Water Resources, NCDEQ ___�-^�.lc�thlrst� C«raapare� State of North Carolina I Environmental Quality 1611 Mail Service Center I Raleigh, North Carolina 27699-1611 919-707-9000 W 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 Inspecbon Type Inspector Fac Type 1 IN 1 2 15 I 3 1 NCO081621 111 121 17/07/17 117 18 I R J 19 L! -j 201 2111 1 1 1 1 1 1 1 1 11 1 1 11 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 11 1 1 1 1 1 166 Inspection Work Days Facility Self -Monitoring Evaluation Rating 131 QA --------Reserved- 671 70 71 LI 72 ti LJ 73 I I 174 751 1 1 1 1 1 1 18FacilityLJ I I I Section 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 37AM 17/07/17 14/10/01 Muddy Creek WWTP 14655 Hopewell Church Rd Exit Time/Date Permit Expiration Date Midland NC 28107 12 25PM 17/07/17 18/10/31 Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s) Other Facility Data Kimberly Dawn Holt/ORC/704-788-4164/ Name, Address of Responsible Official/Title/Phone and Fax Number Contacted Coleman M Keeter,PO Box 428 Concord NC 280260428/Executive Director/704-786-1783/7047951564 No Section C Areas Evaluated During Inspection (Check only those areas evaluated) Operations & Maintenance 0 Effluent/Receiving Waters 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 obe o Scheller MRO WQ//252-946-6481/ Oz—� Signature of Management A Agency/Office/Phone and Fax Numbers Date Ro rw Corey Basinger 9 WQ//704-235-2194/ '1 20 i i EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete Page# 11 NPDES yr/mo/day Inspection Type (Cont) 31 NCo081621 I11 12 17/07/17 17 18 I p 1 Section D Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) On July 14, 2017 Ms Kim Holt (ORC) reported an upset of biological treatment at Muddy Creek VWVfP A site visit was conducted by Mr Roberto Scheller of this Office on July 17, 2017 at 10 37 a m A 30 -minute settabillty test and microscopic exam of the MLSS was conducted during the visit Test indicate that biological process appears to be recovering from upset It was noted that Ms Holt is very knowledgeable of treatment plant operations and biological treatment processes Due to Ms Holt's quick responce to plant upset the plant appeared to be recovering quickly It is recommendation of this Office that commercial and industrial users of the collection system be visited to determine source of plant upset Collection system users should be reminded that unused and/or outdated chemicals and cleaning products should be disposed of properly Page# I Permit NCO081621 Inspection Date 07/17/2017 Owner -Facility Muddy Creek WWTP Inspection Type Reconnaissance Operations & Maintenance Yes No NA NE Is the plant generally clean with acceptable housekeeping? 0 ❑ ❑ ❑ Does the facility analyze process control parameters, for ex MLSS, MCRT, Settleable 0 ❑ ❑ ❑ Solids, pH, DO, Sludge Judge, and other that are applicable? Comment On July 14, 2017 at 11 17 a m this Office received notice of impact to biological treatment at the Muddy Creek VWVFP (NC0081621) A review of the facility was conducted on July 17, 2017 Aeration Basins Yes No NA NE Mode of operation Ext Air Type of aeration system Diffused Is the basin free of dead spots? E ❑ ❑ ❑ Are surface aerators and mixers operational? ❑ ❑ N ❑ Are the diffusers operational? 0 ❑ ❑ ❑ Is the foam the proper color for the treatment process? 0 ❑ ❑ ❑ Does the foam cover less than 25% of the basin's surface? E ❑ ❑ ❑ Is the DO level acceptable? 0 ❑ ❑ ❑ Is the DO level acceptable?(1 0 to 3 0 mg/I) ❑ ❑ ❑ N Comment At the time of the on-site review MLSS had good color with only a slight amount of white foam on surface of aeration basins 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 1/4 of the sidewall depth) Yes No NA NE N ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ ■ ❑ ❑ ❑ E ❑ ❑ ❑ ■ ❑ ❑ ❑ N ❑ ❑ ❑ E ❑ ❑ ❑ ■ ❑ ❑ ❑ Comment Effluent from clarifiers #2 and #4 was clear with few suspended solids Effluent from clarifiers #1 and #3 was turbid with suspended soilds going over weirs Page# 3 Permit NC0081621 Inspection Date 07/17/2017 Owner - Facility Muddy Creek WWTP Inspection Type Reconnaissance Effluent Pipe Yes No NA NE Is right of way to the outfall properly maintained? ❑ ❑ ❑ M 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? ❑ ❑ M ❑ Comment Effluent at step aerator, downstream of filters was clear with no visible suspended solids It was noted that effluent had slight amount of turbidity Page# 4