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Home My WebLink AboutNC0031879_Compliance Evaluation Inspection_20190322DocuSign Envelope ID: C75A15D2-70E4-40C8-9CBC-6746F21787F5 ROY COOPER Gowernor K41CHAEL S. REGAN Scrrefrry LINDA CULPEPPER Director Larry Carver City of Marion PO Box 700 Marion, NC 28752 NOR71-I CAROLINA €nvironmenral Qual" March 22, 2019 SUBJECT: Compliance Inspection Report Corpening Creek WWTP NPDES WW Permit No. NCO031879 McDowell County Dear Permittee: The North Carolina Division of Water Resources conducted an inspection of the Corpening Creek WWTP on 3/21/2019. This inspection was conducted to verify that the facility is operating in compliance with the conditions and limitations specified in NPDES WW Permit No. NC0031879. The findings and comments noted during this inspection are provided in the enclosed copy of the inspection report entitled "Compliance Inspection Report". If you should have any questions, please do not hesitate to contact me with the Water Quality Regional Operations Section in the Asheville Regional Office at 828-296-4500 or via email at tim.heim@ncdenr.gov. Sincerely, EDocuSigned by: fiKtbfAj (�uwt 082B1105A3CA418... Tim Heim, P.E., Environmental Engineer Water Quality Regional Operations Section Asheville Regional Office Division of Water Resources, NCDEQ ATTACHMENTS Ec: WQS-ARO Server LF G:\WR\WQ\Mcdowell\Wastewater\Municipal\Corpening Creek WWTP 31879\2019 CEI\20190322_NC0031879_CEI Ltr.Docx N"NCarokisDepartment ofEnvironmental Quality I OivisionofWater Resources Ashevil ie Regional Office 1 2090 U.S_ 70 if imay I Sw nanoa, North Carolaa 23773 Q 32S 296-4500 DocuSign Envelope ID: C75A15D2-70E4-40C8-9CBC-6746F21787F5 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 IF I 3 I NC0031879 111 12 I 19/03/21 I17 18 I S J 19 L G] 201 I 211111 I I I I I I II I I I I I I I I I I I I I I I I I I I I I I I II I I I I I f6 Inspection Work Days Facility Self -Monitoring Evaluation Rating B1 QA ---------------------- Reserved ------------------- 671 70 I I 71 I I 72 I r I 73 I I 174 751 I I I I I I I80 u I� I I i 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 oermit Number) 09:OOAM 19/03/21 16/05/01 Corpening Creek WWTP 3982 NC Hwy 226 S Exit Time/Date Permit Expiration Date Marion NC 28752 12:OOPM 19/03/21 20/01/31 Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s) Other Facility Data Larry Dean Carver/ORC/828-652-8843/ Name, Address of Responsible Official/Title/Phone and Fax Number Contacted Larry Carver,PO Box 700 Marion INC 28752//828-652-8843/8286591943 Yes Section C: Areas Evaluated During Inspection (Check only those areas evaluated) Permit 0 Flow Measurement Operations & Maintenance Records/Reports Sludge Handling Disposal 0 Facility Site Review Effluent/Receiving Waters 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 Timothy H Heim ARO WQ//828-296-4665/ 3/22/2019 D... Sig-d by: fi�� Lku� Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date D... Sig-d by: 3 / 2 2 / 2 019 IF EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete. Page# DocuSign Envelope ID: C75A15D2-70E4-40C8-9CBC-6746F21787F5 NPDES yr/mo/day Inspection Type (Cont.) NCO031879 I11 121 19/03/21 117 18 JCJ Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) Tim Heim of the Asheville Regional Office performed a Compliance Evaluation Inspection of the Corpening Creek WWTP, on February 22, 2019. Larry Carver (ORC), Ben Worley and Tim Horton were present at the time of the inspection. The system appeared well maintained and operated at the time of the inspection. The following items were noted during the inspection: The weirs on the primary and secondary clarifiers are out of level. Level the weir teeth so that flow is evenly distributed. The permit description of the plant does not include the tertiary sand filters (currently not being used). The ORC requested that this be added back to the permit description in the event the filters are operated in the future. Page# DocuSign Envelope ID: C75A15D2-70E4-40C8-9CBC-6746F21787F5 Permit: NCO031879 Owner - Facility: Corpening Creek WWTP Inspection Date: 03/21/2019 Inspection Type: Compliance Evaluation 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 ❑ ❑ ❑ Solids, pH, DO, Sludge Judge, and other that are applicable? Comment: The facility was well maintained at the time of the inspection. The ORC demonstrated excellent operational knowledge. Permit Yes No NA NE (If the present permit expires in 6 months or less). Has the permittee submitted a new ❑ ❑ ❑ application? 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? ❑ ❑ ❑ Is the inspector granted access to all areas for inspection? 0 ❑ ❑ ❑ Comment: The permit description of the plant does not include the tertiary sand filters (currently not being used). The ORC requested that this be added back to the permit description in the event the filters are operated in the future. Pump Station - Influent Yes No NA NE Is the pump wet well free of bypass lines or structures? 0 ❑ ❑ ❑ Is the wet well free of excessive grease? 0 ❑ ❑ ❑ Are all pumps present? 0 ❑ ❑ ❑ Are all pumps operable? 0 ❑ ❑ ❑ Are float controls operable? 0 ❑ ❑ ❑ Is SCADA telemetry available and operational? 0 ❑ ❑ ❑ Is audible and visual alarm available and operational? 0 ❑ ❑ ❑ Comment: Bar Screens Yes No NA NE Type of bar screen a.Manual ❑ b.Mechanical Are the bars adequately screening debris? 0 ❑ ❑ ❑ Is the screen free of excessive debris? 0 ❑ ❑ ❑ Is disposal of screening in compliance? 0 ❑ ❑ ❑ Is the unit in good condition? 0 ❑ ❑ ❑ Page# 3 DocuSign Envelope ID: C75A15D2-70E4-40C8-9CBC-6746F21787F5 Permit: NCO031879 Owner - Facility: Corpening Creek WWTP Inspection Date: 03/21/2019 Inspection Type: Compliance Evaluation Bar Screens Yes No NA NE Comment: At the time of the inspection, the mechanical screen was undergoing replacement of the bearing and the manual bar screen was being used. The ORC indicated that the mechanical screen should be repaired within the week. Grit Removal Yes No NA NE Type of grit removal a.Manual ❑ b.Mechanical Is the grit free of excessive organic matter? 0 ❑ ❑ ❑ Is the grit free of excessive odor? 0 ❑ ❑ ❑ # Is disposal of grit in compliance? 0 ❑ ❑ ❑ Comment: Primary Clarifier Yes No NA NE Is the clarifier free of black and odorous wastewater? 0 ❑ ❑ ❑ Is the site free of excessive buildup of solids in center well of circular clarifier? N ❑ ❑ ❑ Are weirs level? ❑ 0 ❑ ❑ Is the site free of weir blockage? 0 ❑ ❑ ❑ Is the site free of evidence of short-circuiting? 0 ❑ ❑ ❑ Is scum removal adequate? 0 ❑ ❑ ❑ Is the site free of excessive floating sludge? 0 ❑ ❑ ❑ Is the drive unit operational? 0 ❑ ❑ ❑ Is the sludge blanket level acceptable? 0 ❑ ❑ ❑ Is the sludge blanket level acceptable? (Approximately'/4 of the sidewall depth) 0 ❑ ❑ ❑ Comment: #2 primary is being used in a dual role for EQ capacity, #1 primary was out of service at the time of the inspection for rake repair. Level the weirs. Aeration Basins Yes No NA NE Mode of operation Ext. Air Type of aeration system Surface Is the basin free of dead spots? 0 ❑ ❑ ❑ Are surface aerators and mixers operational? 0 ❑ ❑ ❑ 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? 0 ❑ ❑ ❑ Page# 4 DocuSign Envelope ID: C75A15D2-70E4-40C8-9CBC-6746F21787F5 Permit: NCO031879 Owner - Facility: Corpening Creek WWTP Inspection Date: 03/21/2019 Inspection Type: Compliance Evaluation Aeration Basins Is the DO level acceptable? Is the DO level acceptable?(1.0 to 3.0 mg/1) Yes No NA NE ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ Comment: ORC reports DO is maintained at approximately 2 mq/I and MLSS at 7000 mg/I. This MLSS concentration has proven optimal for this facility. 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'/ of the sidewall depth) Comment: Level the weirs. Disinfection -Gas Are cylinders secured adequately? Are cylinders protected from direct sunlight? Is there adequate reserve supply of disinfectant? Is the level of chlorine residual acceptable? Is the contact chamber free of growth, or sludge buildup? Is there chlorine residual prior to de -chlorination? Does the Stationary Source have more than 2500 Ibs of Chlorine (CAS No. 7782-50-5)? If yes, then is there a Risk Management Plan on site? If yes, then what is the EPA twelve digit ID Number? (1000- - ) If yes, then when was the RMP last updated? Yes No NA NE ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ❑ ■ ❑ ❑ ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ Yes No NA NE Comment: A sun shade has been added to the cylinder storaqe area since the last inspection. De -chlorination ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ❑ ❑ ❑ ■ ■ ❑ ❑ ❑ ❑ ❑ ❑ ■ ❑ ■ ❑ ❑ ❑ ❑ ■ ❑ Page# 5 DocuSign Envelope ID: C75A15D2-70E4-40C8-9CBC-6746F21787F5 Permit: NCO031879 Owner - Facility: Inspection Date: 03/21/2019 Inspection Type: Corpening Creek WWTP Compliance Evaluation De -chlorination Yes No NA NE Type of system ? Gas 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: Are the tablets the proper size and type? ❑ ❑ 0 ❑ Are tablet de -chlorinators operational? ❑ ❑ 0 ❑ Number of tubes in use? Comment: Standby Power Yes No NA NE Is automatically activated standby power available? 0 ❑ ❑ ❑ Is the generator tested by interrupting primary power source? 0 ❑ ❑ ❑ Is the generator tested under load? 0 ❑ ❑ ❑ Was generator tested & operational during the inspection? ❑ ❑ ❑ Do the generator(s) have adequate capacity to operate the entire wastewater site? 0 ❑ ❑ ❑ Is there an emergency agreement with a fuel vendor for extended run on back-up power? 0 ❑ ❑ ❑ Is the generator fuel level monitored? 0 ❑ ❑ ❑ Comment: ORC reports the generator can power the plant for approximately 72 hours before needing to be refueled. Page# 6