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Home My WebLink AboutNC0031879_NOV2021PC0144_RESP_20210315CITY OF MARION PUBLIC WORKS DEPARTMENT P.O. Drawer 700 Marion, NC 28752 828-6524224 March 15, 2021 Mr. Daniel Boss, Assistant Regional Supervisor Water Quality Regional Operations Section, NCDEQ Asheville Regional Office 2090 U.S. Hwy 70 Swannanoa, NC 28778 Subject: Notice of Violation Tracking #: NOV-2021-PC-0144 Permit NO. NCO031879 Corpening Creek WWTP McDowell County Dear Mr. Boss, OFFICE OF THE PUBLIC WORKS DIRECTOR I am writing in response to your letter dated February 17, 2021 and received by the City of Marion on February 18, 2021, requesting, within 30 days of the receipt of the letter, a written response indicating the City's plans to address the indicated violations and other identified issues. The City's plan of action regarding the violations cited and other identified issues is shown below. Description of Violation: 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 clarifiers. Plan of Action: New management staff of the WWTP are currently working to formulate a plan for the repairs and proper operation of the primary clarifiers or for their conversion into true equalization basins, whichever is deemed necessary after a comprehensive assessment. The primary clarifiers are not currently operated as equalization basins. Rather, they are operated as mere pass -through basins that serve no purpose in the treatment process and actually cause problems and operational challenges. According to current and former WWTP employees, the primary clarifiers have been operated in this manner for many years, under the direction of the former ORC who is no longer employed by the City. The exact reason for the primary clarifiers being operated in this manner is unknown. According to a former Lead Operator who no longer works for the City, the primary clarifiers have been operated in this manner for at least 10 — 11 years. The same former Lead Operator also informed me that Primary Clarifier #1 has "not worked right" during his entire 16 year tenure with the City and that no sludge has been pumped Page 1 of 5 (wasted) from the primary clarifiers to the thickeners during the same time frame. The current Lead Operator, who has been employed by the City at the WWTP for 7.3 years has informed me that the drive on Primary Clarifier #1 has not worked at all during his 7.3 year tenure with the City and he has never witnessed sludge being wasted from the primary clarifiers to the thickeners. All of this information is consistent with information found in compliance inspection reports dating back as far as 2007. Please find inspection reports for inspections conducted on 8/21/2007, 2/11/2015, 4/28/2017, and 3/21/2019, attached. Pertinent sections of the reports are highlighted in yellow. As stated previously, the primary clarifiers are operated as pass -through basins, not equalization basins. Equalization basins are typically used to control hydraulic loads by storing peak loads for release and treatment during periods of low loading. To effectively accomplish that in an activated sludge WWTP, the tanks would need to be equipped with aerators or mixers to keep the contents well mixed to provide a consistent organic load to the activated sludge process upon discharge. In addition, the tanks would need to be equipped with pumps capable of pumping to the aeration basins at a constant flow rate during low flow periods. Typically, equalization basins are used in industrial waste treatment plants or in rotating biological contactor (RBC) plants. In RBC plants, equalization basins are typically located after the primary clarifiers and before the rotating biological contactor. If use of an equalization basin is necessary to control flow fluctuations at a conventional activated sludge WWTP, I would recommend that it only be used in addition to the primary clarifiers, not in place of them. The primary clarifiers at the Corpening Creek WWTP are definitely not set up to be used as equalization basins. Current ORC Tim Horton has inherited the problems with the primary clarifiers, and with other plant processes, and has no choice but to operate them in the same manner until a plan can be developed for their repair, replacement, conversion, or elimination. Abrupt changes to plant operation without necessary repairs and/or process changes will cause upset conditions and lead to violations of the NPDES permit limits. New management staff of the WWTP are currently assessing the condition of both primary clarifiers and the associated sludge removal system (which has not been operated in at least 16 years), to determine what repairs are needed and how much those repairs will cost. Staff is also researching old logs and documents in an attempt to determine why the primary clarifiers have been operated in this manner for so long and if the primary clarifiers are even needed. The WWTP, though designed to use the conventional activated sludge process, is (and has been for at least 16 years) operated similar to an extended aeration oxidation ditch. Typically, there are no primary clarifiers ahead of an oxidation ditch. Operating the plant as an oxidation ditch without eliminating or converting the primary clarifiers to aerated or mixed tanks causes significant operational challenges. Staff is currently dealing with these challenges on a daily basis. Failure to remove settled sludge from the primary clarifiers causes gasification to occur in the clarifiers. This gasification results in pH depression, which, if not corrected will prohibit nitrification from occurring in the subsequent activated sludge process (insufficient alkalinity). To combat this, staff adds large amounts of sodium hydroxide and lime ahead of the nitrification process. Sodium bicarbonate is also used as needed. Failure to remove sludge from the primary clarifiers also causes sludge bulking and results in a high BOD load to the aeration basin. Problems are exacerbated when high flows cause organic overload to the secondary processes. As explained earlier, staff is forced to continue operating in this reactive manner until permanent solutions can be developed. Any Page 2 of 5 information the Division can provide as to why the primary clarifiers have been operated in this manner for at least sixteen years would be greatly appreciated. Based on the limited amount of information I have found so far, I can only assume that former WWTP management tried to convert the plant to extended aeration without eliminating or converting the primary clarifiers and without requesting a permit modification. If the WWTP needs to be operated in the extended aeration mode to maintain compliance with permit limits, the primary clarifiers should be eliminated or converted to aerated or mixed equalization basins. Description of Violation: The #1 secondary clarifier is currently out of operation because it is in need of repair due a broken drive unit and sweep arm. Plan of Action: These repairs are currently underway. On February 15, 2021, Kemp Construction Inc. started work on a project, the scope of which was to clean out a clogged suction arm, replace the manifold seals, and install new squeegee blades. While performing this work, Kemp discovered that the drive unit was broken and in need of replacement. Installation of a new drive unit is being planned and coordinated now. In addition, the weirs on clarifier #1 were leveled on 2/12/21. Staff plans to level the weirs on clarifier #2 after clarifier #1 is repaired and returned to service. Description of Violation: A new RAS pump is needed since there is currently no backup RAS pump. Plan of Action: A new RAS pump will be purchased during fiscal year 2021-2022, if not sooner. The ORC is currently trying to obtain proposals from pump vendors. He has requested a quote from a representative of Flygt Pumps. In addition, an employee from Heyward, Inc. was onsite at the WWTP on 3/10/21 to gather information from the existing RAS pumps to assist in finding a replacement pump. The plan is to replace pump #1 with a new pump and retain pump #2 as a backup. Other Identified Issue: 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. Plan of Action: The tertiary filters were included in the Draft NPDES Permit Renewal that is currently being reviewed by WWTP staff. The tertiary filters will be listed in the permit because they are existing structures at the WWTP, but the filters are not operational. Per a former Lead Operator who no longer works for the City, the tertiary filters have not been in operation in at least 16 years. In closing, new management staff at the WWTP have inherited the problems listed above and are working diligently and expeditiously to resolve them. Tim Horton became Superintendent/ORC of the WWTP on 2/13/20 and the WWTP became a division of the Public Works Department on 3/l/20. Since that time, Tim and I have been trying to formulate a plan to correct the operational and mechanical deficiencies at the plant, while simultaneously maintaining compliance with the effluent limits and monitoring requirements. Due to the condition of the plant as we inherited it, we've been forced to be reactive to situations, which has slowed our progress and complicated operations. More comprehensive engineering evaluations will most likely be necessary before a Page 3 of 5 permanent solution to all of the problems can be developed. Since March 1, 2020, all of the following repairs and improvements have been made to the WWTP: Bar Screen Reconditioning: At the time Tim Horton became ORC of the WWTP and the plant became a division of Public Works, the bar screen was not functioning at all. Records indicate that the bar screen had been out of service or not functioning properly since 10/7/2018. Preparations to recondition the bar screen began immediately upon Tim becoming ORC and the plant becoming a division of Public Works. The bar screen was reconditioned via a certified rebuild performed by Parkson Corporation, at a cost of $82,847. Grit Removal Repairs: At the time Tim Horton became ORC of the WWTP and the plant became a division of Public Works, the grit removal system was not functioning at all. Records indicate that the grit removal system had been out of service or not functioning properly since 10/1/2018. Preparations to repair the grit removal system began immediately upon Tim becoming ORC and the plant becoming a division of Public Works. The grit system was repaired and returned to service at a cost of approximately $4,985. Secondary Clarifier Blankets Reduced to Appropriate Levels: At the time Tim Horton became ORC of the WWTP and the plant became a division of Public Works, blankets in the secondary clarifiers consistently ran 6-8 feet. This contributed to loss of solids and TSS violations during times of hydraulic overload. Blankets are now consistently maintained around 2 feet as more wasting is performed, which makes the plant more capable of handling hydraulic overloads. As a result of the increased wasting, the digester is filling more rapidly, which will require land application of biosolids to be increased. This will result in additional expenses of approximately $20,000 this fiscal year. Weirs Leveled on Secondary Clarifier #1 on 2/12/21: The weirs were leveled by WWTP personnel. Suction Arm on Secondary Clarifier #1 Cleaned Out: According to WWTP staff, the drive on secondary clarifier #1 has stopped working on numerous occasions for the last approximately 7 years. The clarifier was drained and it was determined that the cause of the problem was a clogged suction arm. The suction arm was clogged with debris, which caused it to drag the floor of the clarifier on occasion. The drag on the clarifier drive unit caused the drive to fail periodically. Kemp Inc. removed the debris from the suction arm during the week of 2/15/21 at a cost of $9,760 to the City. While removing the debris from the suction arm, Kemp discovered that the drive unit was broken beyond repair and needed to be replaced. Kemp estimated that the drive had been operating "metal on metal' for many years. We are currently in the process of replacing the drive unit. Heyward Inc. has located the drive unit we need and we will be purchasing it once we receive answers to some logistical questions. Kemp Inc. will be installing the drive unit for the City. The total cost of the project will be approximately $80,000. Page 4 of 5 The City would like to request a meeting, either virtual or in person, with D WR ARO staff to discuss the problems at the WWTP in greater detail. We welcome your guidance and recommendations as we devise plans to resolve all of the issues at the WWTP. Should you have further questions regarding the City's plan of action for the violations listed above or for any other issue, please contact meat 828-652-4224 or bsikesna,marionnc.orQ or WWTP Superintendent Tim Horton at 828-652-8843 or thorton@marionnc.org at your convenience. Sincerely, J. Brant Sikes Public Works Director Cc: Bob Boyette, City Manager Tim Horton, WWTP Superintendent/ORC Page 5 of 5 miuiaei r. eearesR wvemur William G. Ross Jr., Secretary Qy North Carolina Department of Environment and Natural Resources Coleen H. Sullins, Director Division of Water Quality ,k Asheville Regional Office SURFACE WATER PROTECTION September 10, 2007 J Robert Boyette City of Marion PO Drawer 700 Marion NC 28752 SUBJECT: Compliance Evaluation Inspection Corpening Creek WWTP McDowell County Dear Mr. Boyette: Enclosed please find a copy of the Compliance Evaluation Inspection Report for the inspection, which I conducted at the subject facility on August 21, 2007. The facility was found to be in Compliance with permit NC0031879. Please refer to the enclosed inspection report for additional observations and comments. If you or your staff has any questions, please do not hesitate to contact me at 828-296-4500. Sincerely , 4/ Keith Haynes Environmental Specialist Enclosure cc: Larry Carver, ORC Central Files Asheville Files 'tur. 2090 U.S. Highway 70, Swannanoa, NC 28778 Telephone: (828) 2964500 Fax: (828) 299-7043 Customer Service 1 877 623-6748 United Stales EnWronmental Protection Agency roved. EPA Washington, D.C. 20460 4057 EAppmval Water Com liance Ins ection Re ort xpires 8-31.98 Section A: National Date System Coding (i.e., PCS) Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type 1 I vl 2 I sl 31 NC0031879 111 121 07/08/21 117 181 ri 191 sl 201 I lJ lJ L LJ U lJ Remarks 2111111111111111111111111111111111111111111111111 Inspection Work Days Facility Self -Monitoring Evaluation Rating at OA —Reserved 67I ' 69 701 1 711 J1 72u 73W 74 75L I I 1 1 1 1 I80 U 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) 09:30 AM 07/08/21 07/01/01 Corpening Creek WWTP NC Hwy 226 3 Exit Time/Date Permit Expiration Date anon 11: 30 AM 07/08/21 10 0l 1 Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s) Other Facility Data Larry Dean Carver/// Larry Dean Carver/ORC/828-652-8843/ Name, Address of Responsible Official/riee/Phone and Fax Number Contacted J Robert Boyette�PO Drawer 700 Marion NC 28752/City Me Manager/828-652-3551/0286521983 Section C: Areas Evaluated Dudng Inspection Check only those areas evaluated) Permit Flow Measurement operations & Maintenance ■ Facility Site Review Compliance Schedules EffluentlReceiving 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 Keith Haynes Aso WQ//828-296-4500/ 4F11f Y t Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date Roger CEdwards- ARO WQ//828-296-9500/ EPA Form 3560-3 (Rev 9.94) Previous editions are obsolete. Page 9 1 NPDES yr/molday Inspection Type 3I NCO031879 I11 12I 07/08/21 I17 18UC Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) The plant is soon to be upgraded. Upgrades include a new barscreen. The sandfilters were not in operation as the sand is in the process of being replaced. U Page 9 2 Permit: NCO031879 Owner -Facility: Corpening Creek wWrP Date: 08/21/2007 inspection Type: Compliance Evaluation Operations & Maintenance Yes No NA NE ■ ❑ ❑ ❑ Is the plant generally clean with acceptable housekeeping? Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable Solids, pH, DO, Sludge ■ ❑ ❑ ❑ Judge, and other that are applicable? Comment: Permit - Yes No NA NE (If the present permitexpires in 6 months or less). Has the permittee submitted a new application? ❑ ❑ ■ ❑ - ■ ❑ O ❑ 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? Comment: Yes No NA NE Bar Screens Type of bar screen n a.Manual - b.Mechanical ■ Q ❑ Cl Are the bars adequately screening debris? ■ ❑ ❑ ❑ Is the screen free of excessive debris? ■ 0 ❑ ❑ Is disposal of screening in compliance? ❑ ■ ❑ ❑ Is the unit in good condition? Comment: The barscreen will be upgraded with the other planned plant improvements Yes No NA NE Primary 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? ■ ❑ n ❑ Is the site free of excessive floating sludge? ■ ❑ ❑ Q Is the drive unit operational? ❑nn■ Is the sludge blanket level acceptable? Page # 3 Permit: NCO031879 Owner - Facility: Corpening Creek W WIP Inspection Date: 08/21/2007 Inspection Type: Compliance Evaluation Primary Clarifier Yes No NA NE Is the sludge blanket level acceptable? (Approximately. %of the sidewall depth) ❑ ❑ ■ ❑ Comment: Only one of the two clarifiers is in use. 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? ■ Cl ❑ Cl 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) ■ ❑ ❑ ❑ Comment: Only one basin is in use for aeration. The other is used as a digester. Disinfection -Gas Yea 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)? 0 ❑ ■ ❑ 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? Comment: Secondary Clarifer 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? ■ ❑ ❑ ❑ `— Page # 4 Permit: NC0031879 Owner -Facility: Corpening Creek W WP Inspection Date: 0821/2007 Inspection Type: Compriance Evaluation Clarifier Yes No NA NE _Secondary 0 ❑ 00 Is the site free of evidence of short-circuiting? in ❑ 00 Is scum removal adequate? M O ❑ ❑ Is the site free of excessive floating sludge? O 011 Is the drive unit operational? Q 0. Q Is the return rate acceptable (low turbulence)? Is the overflow clear of excessive solids/pin floc? ■ ❑ 00 Is the sludge blanket level acceptable? (Approximately %of the sidewall depth) Q DO Comment: The sludge blanket is normally more than 114 of the sidewall depth. Yes No NA NE Standby Power Is automatically activated standby power available? 0 ❑ ❑ O Is the generator tested by interrupting primary power source? m O ❑ ❑ m Q Is the generator tested under load? Was generator tested & operational during the inspection? 0 ❑ El m i Do the generator(s) have adequate capacity to operate the entire wastewater site? m O n Cl Is there an emergency agreement with a fuel vendor for extended run on back-up power? ■ n ❑ n ❑ Is the generator fuel level monitored? Comment: Compliance Schedules - yes No NA NE O 0 Q Is there a compliance schedule for this facility? Is the facility compliant with the permit and conditions for the review period? Q fl Comment: Flow Measurement - Influent vas No NA NE Q M 0 # Is now meter used for reporting? - - - - - -- - m fl fl fl Is flow meter calibrated annually? ■ Q O Is the flow meter operational? (If units are separated) Does the chart recorder match the flow meter? ❑ ❑ ■ ❑ Comment: Flow Measurement - Effluent Yes No NA NE MCI 0 0 # Is flow meter used for reporting? 0 .. Is flow meter calibrated annually? Page # 5 Permit: NC0031879 Owner -Facility: Corpening Creek WWTP Inspection Date: 08/21/2007 inspection Type: Compliance Evaluation Flow Measurement - Effluent Is the flow meter operational? (If units are separated) Does the chart recorder match the flow meter? Comment: Effluent Pipe Is right of way to the outfall property maintained? Are the receiving water free of foam other than trace amounts and other debris? If effluent (diffuser pipes are required) are they operating property?. Comment: Yes No NA NE ■000 ■ 0 C3 0 Yes No NA NE ■000 ■QQO Q ❑ ■ Q Page # 6 NCDENR North Carolina Department of Environment and Natural Resources Pat McCrory Donald R. van der art Secretary Govemor March 13, 2015 J. Robert Boyette, City Manager City of Marion PO Box 700 Marion, NC 28752 SUBJECT: Compliance Evaluation Inspection Corpening Creek WWTP Permit No: NCO031879 McDowell County Dear Mr. Boyette: On February 11, 2015, I conducted a Compliance Evaluation Inspection of the Corpening Creek W WTP. Larry Carver, the Operator in Responsible Charge (ORC), and Tim Heim with the Division of Water Resources were present during the inspection. The facility appeared to be in compliance with permit NC0031879. Please refer to the enclosed inspection report for important observations and comments. If you or your staff have any questions, please call me at 828-296-4500. Sincerely, Linda Wiggs Environmental Senior Specialist Asheville Regional Office Enc. Inspection Report cc: ORC, Larry Carver - MSC 1617-Central Files -Basement Asheville Files . G:\WR\WQ\McDowell\Wwtewater\Municipel\Cotpe-9 Creek wwrP 31879\Feb 2015 respect\M.Feb2015.Ltr.doc Water Quality Regional operations - Asheville Regional Gffice 2090 U.S. Highway 70, Swannanoa, North Carolina 28778 Phone: 828-2964500 FAX: 828-299-7043 Internet: http:rlportal.nodenr.org/webiwq An Equal Gpporbm8yl Affimiaive Action Employer DnReA Stoles Environmental Pmteclicn Agency Form Approved_ EPA Washington, DC 2 OMB No. 2040-0057 Water Compliance Inspection Report Approval expaesMl-98 Section A: National Data System Coding (i.e., PCS) . Transaction Code NPDES yrlmolday Inspection Type Inspector Fac Type 1 Ins I 2 15 I 3 I NCO031879 Ill 12 15/02/11 17 t81Q1 19I S I 2DI 211111IIIII IIIIII IIIIIIIIIIIIIIIIIIIIII 6 Inspection Work Days Facility Self -Monitoring Evaluation Rating Bt CA R$eened W80 67 70 [J 71 L_j 72 L„J 73.I 74 75] Section B: Facility Data Name and Location of Facility Inspected (For Industrial Users discharging to POND, also include Entry Tim/Date Permit Effecava Date POTW name and NPDES permit Number) 10:OOAM 15/02/11 11/12/01 Corpening Creek W*7F Lxd Time/Dat9 Pemlit Expiration Dale 3982 NC Hwy 226 S - - I1:30AM 75102/11 75/01/31 Marion NC 26752 Name(s) of Onsile Rep,esentative(s)rPfes(s)/Phoneand Fax Number($) - _ Omer Facility Date W Name, Address of Responsible Officialfrgle/Phone and Fax Number Contacted Larry Carver, PO Box 700 Marion NC 287521/828-652-884318288591943 Yea Section C: Areas Evaluated During Inspection (Check only those areas evaluated) Permit Flow Measurement Operations & Maintenance RecordslReports Self -Monitoring Program Facility Site Review Compliance Schedules Effluent/Receiving Waters Laboratory Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) (See attachment summary) Narrate) and Signature(s) of Inspeclor(s) Agency/OffceiPhone and Fax Numbers Data Linda S Wiggs '// ARO WQ//828-296A500 Fxt4853/ Timothy Heim c/. /'_ = ARC WQ//828-296-46661 Signature of Management Q AA Reviewer Agency/OfficelPhone and Fax Numbers Data EPA Form 3560-3 (Rev 944) Previous editions are obsolete. Page# NPDES yr/me/day Inspection Type 31 NC0031878 _. I11 12 15/0Y111 17 181„I (Cont) i Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checldists as necessary) Present during the inspection was Larry Carver (ORC) and Tim Heim with DWR. PERMIT: The City has requested an extension of their Compliance Agreement. Regional staff has requested conversation with Central staff regarding this request. The permit is up for renewal. The ORC discussed his concerns regarding the NH3 effluent limit. 0&M: All four weirs (primary and secondary clarifiers) appeared to be out of level. The ORC stated he believed this to be as a consequence of settling due to construction of upgrades. He stated they are scheduled to be leveled this spring/summer. - FACILITY REVIEW. #1 Primary Clarifier and Aeration Basin are not actively in use. Both need to be evaluated for use as EQ per Compliance Agreement. #1 Primary Clarifier has been used on occasion as EQ. #1 Primary Clarifier has maintenance needs if it is to be put back into treatment operation. The tertiary filters are not in use at this time. When the City will be putting these back into operation is unclear. RECORDS: The City needs to submit a copy of the Annual Report to the Asheville Regional Office. An updated ORC designation form needs to be submitted as instructed on the form. The backup ORC needs to be updated. The effluent chart recorder paper was incorrect. ORC stated he would change that immediately. Aliquot obtained for effluent samples is less than 100m1. Page# 2 Permit NCO031879 - Omer-FceBy. conwing Creek WWfP Inspection Date: 02/11/2015inepeetion Type: Compliance Evalua6rn Compliance Schedules Yes No NA NE Is there compliance schedule for this facility? 0 ❑ ❑ ❑ Is the facility compliant with the permit and conditions for the review pedod? ■ ❑ ❑ ❑ Comment: The City requested an extension to the Compliance Agreement C14-001 Operations & Maintenance Yes No NA NE Is the plant generally dean 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 checks sludoe depth using a sludge Was daily and checks D O and MLSS on a less frequent basis. P t Yes No NA NE arms (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? M ❑ ❑ ❑ # Are there any special conditions for the permit? - ❑ ❑ M ❑ Is access to the plant siterestricted to the general public? ❑ ❑ ❑ Is the inspector granted access to all areas for inspection? 0 ❑ ❑ ❑ Comment: The secondary clarifiers need to be added to the permit components list Record Keepina - - Yes No NA NE Are records kept and maintained as required by the permit? ❑ ❑ ❑ Is all required information readily available, complete and current? 0 ❑ ❑ ❑ Are all records maintained for 3 years (lab. reg. required 5 years)? 0 ❑ ❑ ❑ 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 .,._� TransportedCOCs Page* 3 Permit: NCO031879 Owner - FaoiW. CorPemne Creek WwrP Inspection Date: 02/1112015 Iny»olion Type: Compfan Evalua8cn Record Keeping Yes No NA NE Are DMRs complete: do they include all permit parameters? 2 ❑ ❑ ❑ Has the facility submitted its annual compliance report to usersand DWQ? ❑ 0 ❑ ❑ (If the facility is = or> 5 MGD permitted flow) Do they operate 247 with a certified operator ❑ ❑ 0 ❑ 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 NPDE5 permit available on site? Facility has copy of previous year's Annual Report on file for review? ■❑❑❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ■ ❑ ❑ Comment: The annual report has not been sent to DWR. although it has been sent to customers. This facility uses brush aerators. The #1 Aeration Basin was not being operated at the time of Me inspection The ORC stated that the DO levels were maintained around 1 mall in aeration basin a during operation. An updated ORC designation form needs to be submitted. Flow Measurement - Effluent # Is flow meter used for reporting? Is flow meter calibrated annually? Is the flow meter operational? (If units are separated) Does the chartrecorder match the flow meter? Comment: The effluent flow recorder had the wrong chart recorder paper. Pump Station - Influent Is the pump wet well free of bypass lines or structures? Is the wet well free of excessive grease? Are all pumps present? Are all pumps operable? Are float controls operable? Is SCADA telemetry available and operational? Is audible and visual alarm available and operational? Comment: Pump station controls/alarms are checked weekly. Bar Screens Type of bar screen a.Manual Yes No NA NE M ❑ ❑ ❑ ■ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ■ ❑ ❑ Yes No NA NE • ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ • ❑ ❑ ❑ Yes No NA NE Page# 4 Portrait NC0031879 - Owner -Facility: GorpenmBCreek"i"p Inspection Date: 02111/2015- - Inspection Type: CArnpk3nce Evaluation Bar Screens Yes No NA NE b.Mechanical Are the bars adequately screening debris? ❑ ❑ ❑ i - ❑ ❑ Is the screen free of excessive debris? Is disposal of screening in compliance? - M ❑ ❑ ❑ ❑ ❑ ❑ Is the unit in good condition? Comment: Grit Removal - - - Yes No NA NE Type of grit removal ❑ a.Manual b.Mechanical Is the grit free of excessive organic matter? M ❑ ❑ ❑ N ❑ ❑ ❑ Is the grit free of excessive odor? M ❑ ❑ ❑ # Is disposal of grit in compliance? Comment: Equalization Basins Yes No NA NE - ❑ M ❑ ❑ Is the basin aerated? Is the basin free of bypass lines or structures to the natural environment? M ❑ ❑ ❑ M ❑ ❑ ❑ Is the basin free of excessive grease? ❑ ❑ 0 ❑ Are all pumps present? - ❑ ❑ 0 ❑ Are all pumps operable? - - ❑ ❑ ❑ Are float controls operable? ❑ ❑ N ❑ Are audible and visual alarms operable? 0 ❑ ❑ ❑ # Isbasin size/volume adequate? Comment: #1 Primary Clarifier is currently being used an an equalization basin Maintenance is required on the final drive to return this unit to service as a clarfier. Primary Clarifier - Yes No NA NE Is the clarifier free of black and odorous wastewater? N ❑ ❑ ❑ Is the site free of excessive buildup of solids in center well of circular clanfieR M ❑ ❑ ❑ ❑ 0 ❑ ❑ Are weirs level? - - ❑ ❑ ❑ Is the site free of weir blockage? M ❑ ❑ ❑ Is the site free of evidence of short-circuiting? Page# 5 -Permit NCO031879 Imp°8on Date: 02/11/2016 Primary Clarifier Is scum removal adequate? Is the site free of excessive floating sludge? Owner-Faeilty: CorpFsing C2ek VVWTP Inspe lon Type: Cortrplwe Evaluelion Is the drive unit operational? Is the sludge blanket level acceptable? Is the sludge blanket level acceptable? (Approximately %of the sidewall depth) Yes No NA NE s❑❑❑ ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ Comment: As noted above #1 is available for use as EQ. The #2 Primary Clarifier was rehabilitated in 2010. The weirs appeared to be out of level. The ORC stated he believed this to be as a consequence of settling due to construction of upgrades Aeration Basins Yes No NA NE Mode of operation -` Ext. Air Type of aeration system Surface Is the basin free of dead spots? M ❑ ❑ ❑ Are surface aerators and mixers operational? 0 ❑ ❑ ❑ Are the diffusers operational? ❑ ❑ N ❑ Is the foam the proper color for the treatment process? M ❑ ❑ ❑ Does the foam cover less than 25°% of the basin's surface? ® ❑ ❑ ❑ Is the DO level acceptable? i ❑ ❑ ❑ Is the DO level acceptable?(1.0 to 3-0 mgA) 0 ❑ ❑ ❑ Comment: This facility uses brush aerators The ORC stated that the DO levels were maintained around 1 mgA in aeration basins during operation. The #1 Aeration Basin was -not being operated at the time of the inspection Like the #1 Primary Clarifier. the #1 Aeration Basin should be considered for EO if needed. Secondary Clar'rf'ier Yes No NA NE Is the clarifier free of black and odorous wastewater? 0 ❑ ❑ ❑ Is the site free of excessive buildupof 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? N ❑ ❑ ❑ Is the site free of excessive floating sludge? ! ❑ ❑ ❑ Is thedrive unit operational? ❑ ❑ ® ❑ Is the return rate acceptable (low turbulence)? M ❑ ❑ ❑ Page# 6 Permit NCO031879 Owner-Fwiety: corpWIng Creek WWrP Inspection Date: 02(1112015 - InspeUpn Type: Cwnpllanm EvelueAon Secondary Clarlfler Yes No NA NE - - Is the overflow clear of excessive solidsfpin floc? E ❑ ❑ ❑ Is the sludge blanket level acceptable? (Approximately %of the sidewall depth) ❑ ❑ ❑ Comment: The weirs appeared to be out of level The ORC stated he believed this to be as a oonseguence of setting due to construction of upgrades. Filtration (High Rate Tertiary) Yea No NA NE Type of operation: . - Is the filter media present? - ❑ ❑ N ❑ - - - Is the filter surface free of clogging? ❑ ❑ E ❑ Is the fitter free of growth? ❑ ❑ N ❑ - - Is the air scour operational? - ❑ ❑ E ❑ Is the scouring acceptable? - ❑ ❑ N ❑ Is the clear well free of excessive solids and filter media? - ❑ ❑ ❑ - Comment: The tertiary filters are not in use at this time. Disinfection -Gas Yes No NA NE El El El Are cylinders secured adequately? Are cylinders protected from direct sunlight? - - E ❑ ❑ ❑ Is there adequate reserve supply of disinfectant? 0 ❑ ❑ ❑ Is the level of chlorine residual acceptable? ❑ ❑ ❑ 0 Is the contact chamber free of growth, or sludge buildup? N ❑ ❑ ❑ Is there chlorine residual prior to de -chlorination? E ❑ ❑ ❑ Does the Stationary Source have more than 2500 Its of Chlorine (CAS No. 7782-6M)? ❑ ❑ N ❑ If yes, then is there a Risk Management Plan on site? Cl ❑ 0 ❑ If yes, then what is. the EPA twelve digit ID Number? (1000-=___j If yes, then when was the RMP last updated? Comment: 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? ❑ ❑ ❑ Page# 7 Permit N00031879 Owner -Facility: COMPGOMP 19Creek WWlP Inspection Date: 0211112015 Inspection Type: Compliance Evaluation De -chlorination Yes No NA NE Comment: Are the tablets the proper size and type? ❑ ❑ M ❑ Are tablet de -chlorinators operational? ❑ ❑ 0 ❑ Number of tubes in use? - Comment` 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? M ❑ ❑ ❑ If effluent (diffuser pipes are required) are they operating property? - ❑ ❑ ■ ❑ Comment: Laboratory Yes No NA NE Are field parameters performed by certified personnel or laboratory? M ❑ ❑ ❑ Are all other parameters(excluding field parameters) performed by a certified lab? 0 ❑ ❑ ❑ # Is the facility using a contract lab? _ ❑ ❑ ❑ # Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees ❑ ❑ ❑ M Celsius)? Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees? ❑ ❑ ❑ IN Incubator (BOD)set to 20.0 degrees Celsius +/- 1.0 degrees? ❑ ❑ ❑ i Comment: Contract lab is used for Tobcity and Metals Effluent Sampling. Yes No NA NE Is composite sampling flow proportional? M ❑ ❑ ❑ Is sample collected below all treatment units? E ❑ ❑ ❑ 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 0 ❑ ❑ ❑ Celsius)? - Is the facility sampling performed as required by the permit (frequency, sampling type 0 ❑ ❑ ❑ representative)? Comment: Influent aliquot gathered is 50 ml and the effluent aliquot gathered is 60 ml. Page# 8 Water Resources Environmental Quality May 3, 2017 Robert Boyette, City Manager City of Marion PO Box 700 Marion, NC 28752 SUBJECT: Compliance Evaluation Inspection Corpening Creek WWTP Permit No: NCO031879 McDowell County Dear Mr. Boyette: ROY COOPER Governor MICHAEL S. REGAN seeivary S. JAY ZIMMERMAN Director Enclosed please find a copy of the Compliance Evaluation Inspection Form from the inspection of the Corpening Creek WWTP conducted on 4/28/2017. The facility was compliant with permit NC0031879. The assistance of Larry Carver during the inspection was greatly appreciated. Please refer to the enclosed inspection report for additional observations and comments. If you or your staff have any questions, please call me at 828-296-4658. Sincerely, Daniel J. Boss Enclosed: Inspection Report cc: Larry Carver, ORC MSC 1617-Central Files -Basement Asheville Files G:\WR\WQ\McDowell\Wastewater\Municipal\Corpening Creek WWTP 31879\CEI.4.28.2017 compliance letter.doex : - —Nothing Cvmpares7-:.1 State orNorth Carolina I Environmental Quality I Water Resources 2090 U.S. Highway 70, Swannanoa, North Carolina 28778 828-296-4500 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 Fee Type 1 IN 1 2 15 I 3 I N00031879 I11 12 17/04/28 17 181r 1 191 c I 201 I 21IIIIII III III11IIIIII IIIIIIIIIII IIIIIIIIIII �6 Inspection Work Days Facility Self -Monitoring Evaluation Rating B1 CA -------------Reserved-------- 67 70LJ 71 L72 L73II J74 75I I 80 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) 09:30AM 17/04/28 16/05/01 Corpening Creek WWTP 3982 NC Hwy 226 S - Exit Time/Date Permit Expiration Date Marion NC 28752 11:30AM 17/04/28 20/01/31 Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s) Other Facility Data w Larry Dean Carver/ORC/828-652-8843/ Name, Address of Responsible OfficiallTitle/Phone and Fax Number Contacted Larry Carver,PO Box 700 Marion NC 28752//828-652-8843/8286591943 Yes Section C: Areas Evaluated During Inspection (Check only those areas evaluated) Permit E Flow Measurement Operations & Maintenar Records/Reports Sludge Handling Dispos E Facility Site Review Effluent/Receiving Waite 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 Inspectors) Agency/Office/Phone and Fax Numbers Date 06 Daniel J Boss ARO WQ//828-296-4658/ 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# NPDES yr/mo/day Inspection Type 31 NCO031879 I11 12 17/04/28 17 18ICI (Cont.) Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) Mika[ Willmar and I (Daniel Boss) conducted a Compliance Evaluation Inspection at Corpening Creek WWTP on 4/28/2017. We were guided by Larry Carver (ORC) throughout the inspection. Overall the plant appeared well maintained and operated. The primary clarifiers are being used as equalization/retention basins (one used actively, other used as needed). There is an aerobic digester at the facility which is not mentioned anywhere in their permit, but Mr. Carver said it had been included in their permit renewal application. The high rate tertiary filters are not currently in use. The activated sludge process most closely resembles an oxidation ditch. The facility has mechanical surface aerators and the MLSS is kept between 6000-7000 mg/L. Mr. Carver said the high level of MLSS is necessary to get good settling in the secondary clarifier. Weirs need to be adjusted for both the primary and secondary clarifiers as both had effluent flowing through only 1/2 to 2/3 of the v-notches. Mr. Carver said they were already planning on doing that soon. Full chlorine gas cylinders are stored outside with some exposure to direct sunlight. I recommend shading the cylinders in some fashion. Chlorine gas cylinders are stored only about 4ft from dechlorination gas cylinders, but the cylinders are outside where the risk of corrosion from H2SO4 forming is minimal. Page# Permit: NCO031879 Owner -Facility: Corpening Creek WWTP Inspection Date: 04/28/2017 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 ❑ ❑ 0 ❑ 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? 0 ❑ ❑ ❑ Is the inspector granted access to all areas for inspection? ❑ ❑ ❑ Comment: The facility has an aerobic digester which is not mentioned in the permit 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)? 0 ❑ ❑ ❑ Are analytical results consistent with data reported on DMRs? M ❑ ❑ ❑ 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? M ❑ ❑ ❑ 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 operatc ■ ❑ ❑ ❑ 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 ❑ ❑ ❑ Facility has copy of previous year's Annual Report on file for review? ❑ 0 ❑ ❑ Comment: Mr. Carver will be doing an Annual Report on the WWTP for the first time this June Flow Measurement - Effluent # Is flow meter used for reporting? Is flow meter calibrated annually? Yes No NA NE ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ Page# 3 Permit: NCO031879 Owner - Facility: Corpening Creek wwrP Inspection Date: 04/28/2017 Inspection Type: Compliance Evaluation Flow Measurement - Effluent Yes No NA NE Is the flow meter operational? 0 ❑ ❑ ❑ (If units are separated) Does the chart recorder match the flow meter? 0 ❑ ❑ ❑ Comment: 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: MLSS is 6000-7000 mq/L. MCRT is approx 7-10 weeks 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? M ❑ ❑ ❑ Is the unit in good condition? 0 ❑ ❑ ❑ 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? M ❑ ❑ ❑ # Is disposal of grit in compliance? M ❑ ❑ ❑ 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? ❑ ❑ 0 ❑ Are weirs level? ❑ 0 ❑ ❑ Page# 4 Permit: NCO031879 Owner -Facility: Corpening Creek WWiP Inspection Date: 04/28/2017 Inspection Type: Compliance Evaluation Primary Clarifier Yes No NA NE Is the site free of weir blockage? N ❑ ❑ ❑ Is the site free of evidence of short-circuiting? 0 ❑ ❑ ❑ Is scum removal adequate? N ❑ ❑ ❑ Is the site free of excessive floating sludge? 0❑ ❑ ❑ br'v e— u n;+ on PG o l Is the drive unit operational? I -For P Iec s+ - I yeo.rs. ■ El El El Is the sludge blanket level acceptable? S/u J e ups (1a ve n a > 0 ❑ ❑ ❑ pCr a7�g �eeLSf- /6 /ear$ . Is the sludge blanket level acceptable? (Approximate y Y< of the sidewall depth) ❑ ❑ ❑ Comment: The Drimary clarifier is really lust being oneratpd ac an enuali7atinn hasin All wnlidc frnm the Secondary 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? E ❑ ❑ ❑ Is the drive unit operational? E ❑ ❑ ❑ Is the return rate acceptable (low turbulence)? E ❑ ❑ ❑ Is the overflow clear of excessive solids/pin floc? 0 ❑ ❑ ❑ Is the sludge blanket level acceptable? (Approximately Y< of the sidewall depth) 0 ❑ ❑ ❑ Comment: Sludge blanket is kept around 4ft according to Mr. Carver, which is 25% of the total clarifier depth of 16ft. Weirs need to be adjusted. 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 ❑ ❑ ❑ Is the DO level acceptable? 0 ❑ ❑ ❑ Page# 5 Permit: NCO031879 Inspection Date: 04/28/2017 Aeration Basins Is the DO level acceptable?(1.0 to 3.0 mg/1) Owner - Facility: Corpening Creek VwVTP Inspection Type: Compliance Evaluation Yes No NA NE ❑ ❑ ❑ ■ Comment: Mr. Carver said that the typical DO for the aeration basins is between 4-6 mg/L. Filtration (High Rate Tertiary) Yes No NA NE Type of operation: Down flow Is the filter media present? 0 ❑ ❑ ❑ Is the filter surface free of clogging? ❑ ❑ 0 ❑ Is the filter free of growth? ❑ ❑ ■ ❑ Is the air scour operational? ❑ ❑ 0 ❑ Is the scouring acceptable? ❑ ❑ E ❑ Is the clear well free of excessive solids and filter media? ❑ ❑ 0 ❑ Comment: Tertiary filters are not in use Disinfection -Gas Yes No NA NE Are cylinders secured adequately? 0 ❑ ❑ ❑ Are cylinders protected from direct sunlight? ❑ 0 ❑ ❑ Is there adequate reserve supply of disinfectant? 0 ❑ ❑ ❑ Is the level of chlorine residual acceptable? ❑ ❑ ❑ Is the contact chamber free of growth, or sludge buildup? E ❑ ❑ ❑ Is there chlorine residual prior to de -chlorination? ❑ ❑ ❑ Does the Stationary Source have more than 2500 Ibs of Chlorine (CAS No. 7782-50-5)? ❑ 0 ❑ ❑ If yes, then is there a Risk Management Plan on site? ❑ ❑ 0 ❑ If yes, then what is the EPA twelve digit ID Number? (1 000__) If yes, then when was the RMP last updated? Comment: Cylinders should be protected from direct sunlight. De -chlorination Yes No NA NE Type of system ? Gas Is the feed ratio proportional to chlorine amount (1 to 1)? E ❑ ❑ ❑ Is storage appropriate for cylinders? 0 ❑ ❑ ❑ # Is de -chlorination substance stored away from chlorine containers? ❑ 0 ❑ ❑ Are the tablets the proper size and type? ❑ ❑ 0 ❑ Comment: Dechlorination cylinders are stored near the chlolrine gas cylinders in an outdoor location. Page# 6 Permit: NC0031879 Inspection Date: 04/28/2017 De -chlorination Are tablet de -chlorinators operational? Number of tubes in use? Comment: Owner -Facility: Corpening Creek VATP Inspection Type: Compliance Evaluation Effluent Pipe Is right of way to the outfall properly maintained? Are the receiving water free of foam other than trace amounts and other debris? If effluent (diffuser pipes are required) are they operating properly? Comment: Yes No NA NE ❑ ❑ ■ ❑ Yes No NA NE ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ❑ ❑ ® ❑ Page# 7 March 22, 2019 Larry Carver City of Marion PO Box 700 Marion, NC 28752 SUBJECT: Compliance Inspection Report Corpening Creek WWTP NPDES WW Permit No. NC0031879 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, oxuswMa er. aeza„�u3�1a 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\WastevraterlMunicipaACorpening Creek VNNrP.31879\2019 CEI\20190322_NC0031879_CEI Ltr.Docz DocuSign Envelope ID: C76A15D2-70E4.40C8-9C6G-5746F21787F5 n UNIed Stele. F TmmeMel Pm di.n Agenry Form Approved. EPA Washington, D.C. 2D460 OMB No. 2040-0057 Water Compliance Inspection Report Approval expires8-31-98 - Section A: National Data System Coding (i.e.. PCS) Transaction Code - NPDES- yr/mo/day Inspection Type Inspector Fac Type 1 L, I 2 IS 1 3 I NCO031879 I11 121 19/o3i2i 17 181 r. t 191 s I 201 lJ 211 11 Ill I I I I I I I I I 11 I I I I I I I I I I I I I I I I I I 11 I I lL.J Inspection Work Days Facility Self -Monitoring Evaluation Rating B1 OA Reserved- 80 72 L„ 73I 74 75L1_LI�1 _ 67 I I - —, 70L—^71 ilI Secton B: FacilityData - Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include Entry Time(Dale Permit Effective Date POTW name and NPDESoarmil Number) 09:00AM 19/0321 18/D5/D1 Corpening Creek W WiP _. - _. _ _ - _ _ Exit Tins/Date Permit Expiration Data 3982 NO Hwy 226 S 12:00PM 1910321 20/01131 Marion NO 2B752 - - Name(s) of Onsite Representative(s)/rales(s)/Phone and Fax Number(s) Other Facility Date Larry Dean Carver/ORC/828-652-8843/ Name, Address of Responsible OfticiaVTifle/Phone and Fax Number Contacted Larry Carver,PO Box 700 Marion NO 287521/828-052-8843/8286591943 yes Section C: Areas Evaluated During Inspection (Check only those areas evaluated) Permit E. Flow Measurement N Operations & Maintenance RecordslReports Sludge Handling Disposal 0Facility Site Review E Effluent/Receiving Waters Laboratory Section D- Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) (See attachment summary) Names) and Signature(s) of Inspector(s) Agency/01fica/Phona and Fax Numbers Date Timothy H Heim ARC, WO//828-296-4665/ 3/22/2019 wz.q�aq: 1 P I (\UM Signature of Management O A Reviewer Agency/Office/Phone and Fax Numbers Date 3/22/2019 EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete. Page# DocuSign Envelope ID: C75A15D2-70E430C8-9CBC-6746F21787F5 NPDES yr/mo/day Inspection Type (Cont.) t 3I NCO031879 I11 12 2 3/21 17 18 LCj 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 W WTP, 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 fitters (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. Pam 2 DocuSign Envelope ID: C75A15D2-7OE430C8-9CBC-6746F21787F5 Permit: NCO031879 - Owner -Facility: Corpening Creek WWTP Inspection Date: 03/21/2019 - - Inspection Type: Compliance Evaluation 1 Operations & Maintenance - Yes No NA NE Is the plant generally clean with acceptable housekeeping? M ❑ ❑ ❑ Does the facility analyze process control parameters, forex:MISS, MCRT, Settleable 0 ❑ ❑ ❑ 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 pennittee submitted a new ❑ ❑ M ❑ application? Isthe, facility as_described -in.the permit?._ --.__.-. _._. -___ -..-- - - 0-0- 110 # Are there any special conditions for the permit? ❑ 0 ❑ ❑ Is access to the plant site restricted to the general public? i ❑ ❑ ❑ Is the inspector granted access to all areas for inspection? 0 ❑ ❑ ❑ Comment: The permit description of the plant does not include the tertiary sand fitters (currently not Pump Station -- Influent Yes No NA NE Is the pump wet well free of bypass lines or structures? M ❑ ❑ ❑ Is the wet well free of excessive grease? M ❑ ❑ ❑ Are all pumps present? M ❑ ❑ ❑ Are all pumps operable? 0 ❑ ❑ ❑ Are Float controls operable? 0 ❑ ❑ ❑ Is SCADA telemetry available and operational? _ M ❑ ❑ ❑ Is audible and visual alarm available and. operational? - - ❑ ❑. ❑ comment: Bar Screens Yes No NA NE Type of bar screen - ❑ a.Manual _ M b.Mechanical Are the bars adequately screening debris? - N ❑ ❑ ❑ Is the screen free of excessive debris? 0 ❑ ❑ ❑ Is disposal of screening in compliance? _ M ❑ ❑ ❑ M ❑ ❑ ❑ Is the unit in good condition? Page# 3 DocuSign Envelope ID: C75A15D2-70E4-40C8-9CBC-5745F21787F5 Permit: NCO031379 Owner -Facility: Corpening CreekwwrP Inspection Date: 0312112019 Inspection Type: compliance Evaluation Bar Screens Yos 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 tieing 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? ❑ ❑ ❑ Is the grit free of excessive odor? - - - - N ❑ ❑ El # 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? 0 ❑ ❑ ❑ _. Are weirs level? ❑ 0 ❑ ❑ U Is the site free of weir blockage? N ❑ ❑ ❑ Is the site free of evidence of short-circuiting? ❑ ❑ ❑ ❑ ❑ Is scum removal adequate? ❑ Is the site free of excessive floating sludge? p ❑ ❑ ❑ unito operational? Ori vE Uni f On !C.#'� A4.f Y1ol`- 6e.cn Is the drive unit . ❑ ❑ ❑ P opetr4-h�an^4-I -Fr_-) P- teC.St- -I YGk1rf. Is the sludge blanket level acceptable? Soup G U°\P � � �M - /O/e ,l J ■ ❑ ❑ ❑ Is the sludge blanket level acceptable? (Apprdximately Y. of the sidewall depth) J - ❑ ❑ ❑ Comment: #2 primary iu being d to a dual role for Ed rapaa usety 01 orimary was but of service at the time of the inspection for rake repair. Level the weirs y� Aeration Basins �.r Q— reAS-f— / �e krg. Yea 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 ❑ ❑ ❑ ❑ ❑ 0 ❑ 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? ❑ ❑ ❑ Page# 4 DocuSign Envelope ID: C75A15D2-7OE4-40C8-9CBC-6748F21787F5 Permit: NCO031879 D ner Faelllty: Coryening CnmkWWTP Inspection Oats: 0312112019 - - Inspection Type: Compliance Evaluation Aeration Basins Is the DO level acceptable? Is the DO level acceptable?(1.0 to 3.0 mgA) Yes No NA NE ❑ ❑ ❑ ❑ ❑ ❑ Comment: ORC reports DO is maintained at approximately 2 mgA and MLSS at 7000 mall. 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 centerwell 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 Y. 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. 778250-5)? If yes, then is there a Risk Management Plan on site? If yes, then what is the EPA twelve digit iD Number? (1000 _) Yea No NA NE ■ ❑ ❑ ❑ ■ ❑ ❑ ❑ ❑ N ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ■ ❑ ❑ ❑ IN ❑ ❑ ❑ ■ Cl ❑ ❑ ■ ❑ ❑ ❑ E ❑ ❑ ❑ Yes No NA NE ■ ❑ ❑ ❑ ❑ ❑ ❑ ■ Cl ❑ ❑ ❑ ❑ ❑ ■ ❑ ❑ ❑ ❑ ❑ ❑ ■ ❑ N ❑ ❑ ❑ ❑ ■ ❑ If yes, then when was the RMP last updated? Comment: A sun shade has been added to the cylinder storage area since the last inspection. 11—\ De -chlorination Yes No NA NE Page# 5 DocuSign Envelope ID: C75A15D2-70E4-40C8-9CBC-6746F21787F5 Permit NC0031879 Owner-Facillty: Inspection Date: 03/21/2019 - tnspedon Type: Corpaninp Creak NN4TP 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? - ❑ ❑ ❑ #is de -chlorination substance stored awayfrom chlorine containers? - ❑ ❑ ❑ Comment Are the tablets the proper size and type? ❑ ❑ M ❑ Are tablet de -chlorinators operational? ❑ ❑ M ❑ Number of tubes in use? Comment: StandbyPower 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 ❑ Cl ❑ Is there an emergencyagreement with a fuel vendor for extended run on back-up power? 0 ❑ ❑ ❑ Is the generator fuel level monitored?- M ❑ ❑ ❑ Comment: Page# 6