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Home My WebLink AboutNC0031879_NOV2021PC0144 CEI_20210217 SENT VIA ELECTRONIC MAIL ONLY: NO HARD COPY WILL BE MAILED February 17, 2021 J. R. Boyette, City Manager City of Marion Email: bboyette@marionnc.org SUBJECT: NOTICE OF VIOLATION Tracking Number: NOV-2021-PC-0144 Permit No. NC0031879 Corpening Creek WWTP McDowell County Dear Permittee: The North Carolina Division of Water Resources conducted an inspection of the Corpening Creek WWTP on February 5, 2021. 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. A summary of the findings and comments noted during the inspection are provided in the enclosed copy of the inspection report. The Compliance Evaluation inspection was conducted by Division of Water Resources staff from the Asheville Regional Office. The following violation(s) were noted during the inspection: Inspection Area Description of Violation _________________________________________________________________________________________________________________________________________________________________________ Primary Clarifier Both primary clarifiers are being used as equalization basins, and both sweep arms are not operational. Additionally, the sludge blankets are 9 feet out of 16 feet in both primary clarifiers. Permit Standard Conditions Section C. 2 requires the permittee to properly operate and maintain all facilities and systems of treatment which are installed to achieve compliance. _________________________________________________________________________________________________________________________________________________________________________ Secondary Clarifier The #1 secondary clarifier is currently out of operation because it is in need of repair due to a broken drive unit and sweep arm. Permit Standard Conditions Section C. 2 requires the permittee to properly operate and maintain all facilities and systems of treatment which are installed to achieve compliance. _________________________________________________________________________________________________________________________________________________________________________ DocuSign Envelope ID: A045B785-2D59-476B-9979-2F7BA0164F82 Pumps-RAS-WAS A new RAS pump is needed since there is currently no backup RAS pump. Permit Standard Conditions Section C. 2 requires the permittee to properly operate and maintain all facilities and systems of treatment which are installed to achieve compliance. _________________________________________________________________________________________________________________________________________________________________________ In addition, the issue below must also be addressed: The tertiary filters are currently not listed in the permit, but should be added back to the permit because they are existing structures at the WWTP. Remedial actions should have already been taken to correct this problem and prevent further occurrences in the future. The Division of Water Resources may pursue enforcement action for this and any additional violations of State law. To prevent further action, please respond in writing to this office within 30 days upon your receipt of this Notice of Violation regarding your plans or measures to be taken to address the indicated violations and other identified issues, if applicable. If you should have any questions, please do not hesitate to contact Lauren Armeni with the Water Quality Regional Operations Section in the Asheville Regional Office at 828-296-4500. Sincerely, Daniel Boss, Assistant Regional Supervisor Water Quality Regional Operations Section Asheville Regional Office Division of Water Resources, NCDEQ ATTACHMENTS: Inspection Report Ec: Brant Sikes, Public Works Director Tim Horton, ORC LF DocuSign Envelope ID: A045B785-2D59-476B-9979-2F7BA0164F82 EPA United States Environmental Protection Agency Washington, D.C. 20460 Water Compliance Inspection Report Form Approved. OMB No. 2040-0057 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 N 52 NC0031879 21/02/05 C S31112171819 20 21 66 Inspection Work Days Facility Self-Monitoring Evaluation Rating B1 QA ----------------------Reserved------------------- N67707172 73 74 75 80 Section B: Facility Data Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include POTW name and NPDES permit Number) Corpening Creek WWTP 3982 NC Hwy 226 S Marion NC 28752 Entry Time/Date Permit Effective Date Exit Time/Date Permit Expiration Date 11:00AM 21/02/05 16/05/01 Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s) /// Other Facility Data 12:30PM 21/02/05 20/01/31 Name, Address of Responsible Official/Title/Phone and Fax Number Larry Carver,PO Box 700 Marion NC 287520700//828-652-8843/8286591943 Contacted No Section C: Areas Evaluated During Inspection (Check only those areas evaluated) Permit Flow Measurement Operations & Maintenance Records/Reports Self-Monitoring Program Sludge Handling Disposal 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 Lauren E Armeni DWR/ARO WQ/828-296-4500/ Mikal Willmer DWR/Division of Water Quality/828-296-4686/ Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete. Page#1 DocuSign Envelope ID: A045B785-2D59-476B-9979-2F7BA0164F82 2/18/2021 DocuSign Envelope ID: EFC010C6-F66F-4429-960B-126FC3D6F34D 2/18/2021 2/18/2021 NPDES yr/mo/day 21/02/05 Inspection Type C3111218 1 Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) Lauren Armeni and Mikal Willmer, with the Asheville Regional Office, conducted a compliance evaluation inspection of the Corpening Creek WWTP on February 5, 2021. This inspection was conducted to determine whether the facility is being operated and maintained in compliance with NPDES Permit No. NC0031879. Tim Horton (ORC), Jeff Sanders (Lead Operator), and Doug Mackey (Interim Lead Operator) were present and assisted in the inspection. Facility consists of a mechanical step bar screen backed up by a manual bar screen, grit chamber, two circular primary clarifiers (both of these clarifiers are currently being used as EQ basins), two aeration basins (one is operational), two circular secondary clarifiers, baffled chlorine contact chamber, gas chlorination and sulfur dioxide dechlorination, step aeration, two gravity sludge thickeners, and one aerobic digester. The following items were noted during the inspection: Primary Clarifiers: Both primary clarifiers are currently being used as EQ basins. Both sweep arms on the clarifiers are broken and in need of repair. Additionally, the weirs still need to be leveled. The ORC stated the plan is to level the weirs themselves this year. The first clarifier arm stopped working around one year ago, and the second clarifier arm stopped working a couple months ago. The water within the clarifiers was black with scum on the surface. The sludge blanket in both clarifiers is 9 feet with a depth of 16 feet. Sludge was pumped out of one of the primary clarifiers around 10 years ago using a vacuum truck. The pipes from the primary clarifiers to the thickeners have been clogged for more than 10 years. Aeration Basins: One of the two aeration basins is currently operational. The #1 aeration basin is currently being used as a backup EQ basin as needed and some aerators need replaced. The ORC stated they would like to get it cleaned out and back in operation since all the valves work and it would add to their treatment capacity; however, rainfall has made this difficult. This facility utilizes brush aerators. The ORC stated that the DO levels were maintained around 1 mg/L in the aeration basin during operation. The measured DO on the day of inspection was around 3.0 mg/L. The MLSS is still being maintained at 7,000 mg/L; however, the effluent numbers appear to be in compliance and are meeting ammonia limits. Secondary Clarifiers: The weirs on primary clarifier #2 still needs to be leveled and is on the docket to be leveled this year; however, this issue is not currently impacting treatment. The sludge blankets have been significantly reduced due to better solids management within the plant (blankets were previously run 8-9 feet). The sludge blanket in both clarifiers was around two feet and the depth of the clarifiers is ten feet. The sweep arm on secondary clarifier #1 starts and stops, and it appears that the suction arm is clogged and the drive unit is not operational. The staff plans on draining the clarifier and they are having someone out to figure out the exact issue and make necessary repairs. The plant currently has two RAS pumps. One is around 40 years old and the other is around 20 years old. The older RAS pump is not being used, so currently there is no backup. In the new fiscal year (FY22), the plant is planning on buying a new RAS pump and using the 20-year old pump as the backup. Both WAS pumps are operational and in good condition. Tertiary Filters: The tertiary filters are not in use at this time. The ORC indicated they would like to have them operational at some point, but they will first need to be rehabilitated It is recommended that the tertiary filters be added back to the permit since they are still a system component, just not NC0031879 17 (Cont.) Page#2 DocuSign Envelope ID: A045B785-2D59-476B-9979-2F7BA0164F82DocuSign Envelope ID: EFC010C6-F66F-4429-960B-126FC3D6F34D Permit:NC0031879 Inspection Date:02/05/2021 Owner - Facility: Inspection Type: Corpening Creek WWTP Compliance Evaluation currently in operation. Overall, the facility is in non-compliance with the requirements outlined in the permit for the following reasons: 1. Both primary clarifiers are being used as equalization basins. Both primary clarifiers need to be repaired and utilized as they were intended to, otherwise an engineering analysis and permit modification may need to be performed. The sludge blankets are 9 feet in both primary clarifiers, which is a concern for high flows into the plant. 2. The #1 secondary clarifier is in need of repair due to a broken arm. 3. A new RAS pump is needed. There is currently not a backup RAS pump due to the age of the previous backup RAS pump (~40 years old). Page#3 DocuSign Envelope ID: A045B785-2D59-476B-9979-2F7BA0164F82DocuSign Envelope ID: EFC010C6-F66F-4429-960B-126FC3D6F34D Permit:NC0031879 Inspection Date:02/05/2021 Owner - Facility: Inspection Type: Corpening Creek WWTP Compliance Evaluation 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? # Are there any special conditions for the permit? Is access to the plant site restricted to the general public? Is the inspector granted access to all areas for inspection? The permittee has submitted a new application and the permit is currently in draft and under review. Comment: Record Keeping Yes No NA NE Are records kept and maintained as required by the permit? Is all required information readily available, complete and current? Are all records maintained for 3 years (lab. reg. required 5 years)? 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 COCs Are DMRs complete: do they include all permit parameters? Has the facility submitted its annual compliance report to users and DWQ? (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? Is the ORC certified at grade equal to or higher than the facility classification? Is the backup operator certified at one grade less or greater than the facility classification? Is a copy of the current NPDES permit available on site? Facility has copy of previous year's Annual Report on file for review? Comment: Operations & Maintenance Yes No NA NE Is the plant generally clean with acceptable housekeeping? Page#4 DocuSign Envelope ID: A045B785-2D59-476B-9979-2F7BA0164F82DocuSign Envelope ID: EFC010C6-F66F-4429-960B-126FC3D6F34D Permit:NC0031879 Inspection Date:02/05/2021 Owner - Facility: Inspection Type: Corpening Creek WWTP Compliance Evaluation Operations & Maintenance Yes No NA NE Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable Solids, pH, DO, Sludge Judge, and other that are applicable? The facility checks sludge depth daily using a sludge judge. Dissolved oxygen and MLSS are checked weekly. 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? Is the unit in good condition? The mechanical bar screen was previously down for approximately 6 months to a year, but is now repaired and fully operational. Comment: Grit Removal Yes No NA NE Type of grit removal a.Manual b.Mechanical Is the grit free of excessive organic matter? Is the grit free of excessive odor? # Is disposal of grit in compliance? Grit removal was previously not working for approximately 6 months to a year, but is now repaired and fully operational. Since the bar screen and grit removal were down for this amount of time, solids management became an issue, but the ORC appears to have this under control now. Comment: Primary Clarifier Yes No NA NE 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? Page#5 DocuSign Envelope ID: A045B785-2D59-476B-9979-2F7BA0164F82DocuSign Envelope ID: EFC010C6-F66F-4429-960B-126FC3D6F34D Permit:NC0031879 Inspection Date:02/05/2021 Owner - Facility: Inspection Type: Corpening Creek WWTP Compliance Evaluation Primary Clarifier Yes No NA NE Is the drive unit operational? Is the sludge blanket level acceptable? Is the sludge blanket level acceptable? (Approximately ¼ of the sidewall depth) Both primary clarifiers are currently being used as EQ basins, and the weirs need leveled on both. The wastewater within the primary clarifiers appeared black with scum on the surface. The ORC stated the drive units malfunctioning may be the reason the sweep arms stopped working. The sludge blanklet levels in both clarifiers are at 9 feet out of 16 feet. See summary for further details. Comment: Aeration Basins Yes No NA NE Mode of operation Ext. Air Type of aeration system Surface 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/l) Aeration basin #2 is currently in operation and Aeration basin #1 currently needs to be cleaned out in order to be put back online. See summary for futher details. Comment: Secondary Clarifier Yes No NA NE 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 ¼ of the sidewall depth) Page#6 DocuSign Envelope ID: A045B785-2D59-476B-9979-2F7BA0164F82DocuSign Envelope ID: EFC010C6-F66F-4429-960B-126FC3D6F34D Permit:NC0031879 Inspection Date:02/05/2021 Owner - Facility: Inspection Type: Corpening Creek WWTP Compliance Evaluation Secondary Clarifier Yes No NA NE The weirs on secondary clarifier #2 need to be leveled. The drive unit and sweep arm are not operational on secondary clarifier #1. See summary for further details. Comment: Pumps-RAS-WAS Yes No NA NE Are pumps in place? Are pumps operational? Are there adequate spare parts and supplies on site? The current RAS pump is ~20 years old and is operational, but no backup RAS pump is available. The WAS pumps are working and in good condition. Comment: Filtration (High Rate Tertiary)Yes No NA NE Type of operation: Is the filter media present? Is the filter surface free of clogging? Is the filter free of growth? Is the air scour operational? Is the scouring acceptable? Is the clear well free of excessive solids and filter media? The tertiary filters are not in use at this time. See summary for further details. Comment: Disinfection-Gas Yes No NA NE 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 lbs 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? All cylinders are adequately secured and out of direct sunlight.Comment: Page#7 DocuSign Envelope ID: A045B785-2D59-476B-9979-2F7BA0164F82DocuSign Envelope ID: EFC010C6-F66F-4429-960B-126FC3D6F34D Permit:NC0031879 Inspection Date:02/05/2021 Owner - Facility: 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)? Is storage appropriate for cylinders? # Is de-chlorination substance stored away from chlorine containers? Comment: Are the tablets the proper size and type? Are tablet de-chlorinators operational? Number of tubes in use? Comment: Flow Measurement - Effluent Yes No NA NE # Is flow meter used for reporting? Is flow meter calibrated annually? Is the flow meter operational? (If units are separated) Does the chart recorder match the flow meter? Comment: Effluent Sampling Yes No NA NE Is composite sampling flow proportional? Is sample collected below all treatment units? Is proper volume collected? Is the tubing clean? # Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees Celsius)? Is the facility sampling performed as required by the permit (frequency, sampling type representative)? Comment: Laboratory Yes No NA NE Are field parameters performed by certified personnel or laboratory? Are all other parameters(excluding field parameters) performed by a certified lab? # Is the facility using a contract lab? # Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees Celsius)? Page#8 DocuSign Envelope ID: A045B785-2D59-476B-9979-2F7BA0164F82DocuSign Envelope ID: EFC010C6-F66F-4429-960B-126FC3D6F34D Permit:NC0031879 Inspection Date:02/05/2021 Owner - Facility: Inspection Type: Corpening Creek WWTP Compliance Evaluation Laboratory Yes No NA NE Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees? Incubator (BOD) set to 20.0 degrees Celsius +/- 1.0 degrees? Environmental Testing is used for toxicity, metals, total cyanide, total nitrogen, and total phosphorus. Comment: Standby Power Yes No NA NE Is automatically activated standby power available? Is the generator tested by interrupting primary power source? Is the generator tested under load? Was generator tested & operational during the inspection? Do the generator(s) have adequate capacity to operate the entire wastewater site? Is there an emergency agreement with a fuel vendor for extended run on back-up power? Is the generator fuel level monitored? A new generator was installed in February 2020. The generator was assessed during the inspection, and it was found that the digital fuel level was inaccurate (said zero gallons but tank was full). It is recommended to repair this function so it is always known what the precise fuel level is. Comment: Aerobic Digester Yes No NA NE Is the capacity adequate? Is the mixing adequate? Is the site free of excessive foaming in the tank? # Is the odor acceptable? # Is tankage available for properly waste sludge? The ORC stated that some blowers were repaired in early 2020, but there are still blowers that need repaired. Comment: Page#9 DocuSign Envelope ID: A045B785-2D59-476B-9979-2F7BA0164F82DocuSign Envelope ID: EFC010C6-F66F-4429-960B-126FC3D6F34D "',rrr�;c� .fx �,k f �,s ti +1a, qr "i� 3 " � "-'ir rx , ,.. � y. � :s4 r � }� ..iMfy �� ,+,'��c�p, �'�a � as ,,t` � s �1''d . �,�1! Siy�tf;,�.1�;�t � p�.•. ��,r � �i�fi�r� .. i.� �i ; , r . � s. � k. � ti±�j, r ;� s ^ems""' .�� i ! � , � I�,* �' ; f�. � ` �j.`,y r . ��g I,�s ✓ � ��C " � yt"'��ik,.,r�.. `�(f/�, J r ! r r. � ��✓ Y1�.1, � e�'1y ��r !'�,r1%y �� "��`� .t•+... » \:_ r 1 �� J.ix�,u+'�� .a %�� i" } ?5. ,,, i�r ..�r �� ,� �: � f � { .ram ',{l3"p�j �': �i'/�. 1,-�Q � 1�' � �,-�'�. i�1y k��. .Z y��%. �"�. �'i.: '��a� t+• t I �t•� '��' .>or 'A��. �4�`�:e�' �kiil�f �I��it•,p. •. 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