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Home My WebLink AboutNC0025453_Historical information_20171231Hayes, Mitch i James O. Warren <jowarren@townofclaytonnc.org > Friday, January 06, 2017 7:41 AM Hayes, Mitch Town of Clayton, NC From: Sent: To: Subject: Hi Mitch Just dropping you a line about some activities going on at the Little Creek Water Reclamation Facility NPDES # NC0025453. We currently have one of our tertiary filters down for repair in order to restore the backwash function. We will be pumping around the unit while the repair is in progress. This activity should not impair the effluent quality as most of the clarifier effluent is being filter and already meets the NPDES limits. We have also brought in a contractor to dewater sludge for the winter period, the biosolids will be disposed of in the Johnston County Landfill. We are also taking measures to address the cold weather forecasted for the next few days. Thanks James Warren, Town of Clayton ORC Hayes, Mitch i James O. Warren <jowarren@townofclaytonnc.org > Wednesday, May 10, 2017 3:37 PM Hayes, Mitch Monthly and weekly exceedance BOD From: Sent: To: Subject: Mr. Hayes I will be reporting a monthly and weekly BOD exceedance for the Water Reclamation Facility for April 2017. The monthly average was 5.4 mg/l (limit 5 mg/l) and the 4th weekly average was 8.95 mg/l (limit 7.5 mg/l). This is directly attributed to the excessive inflow and infiltration we experienced during the torrential rain event that occurred April 24-26th. A total of 7.23 inches of rain fell during this time period at the facility. The flow for the period was: 4/25 5.54 mg, 4/26 5.064 mg 4/27 3.732 mg 4/28 2.374 mg. I will be reporting this on the eDMR as required. James Warren, ORC Town of Clayton, NC NPDES# NC0025453 June 19, 2017 Limit Exceedance Violation(s): Date 8.437.54/29/2017001 Effluent Monthly Average Exceeded5.1954/30/2017001 Effluent 1 Sample Location Limit Value Reported Value Type of Violation Weekly Average Exceeded Adam Lindsay, Town Manager Town of Clayton PO Box 879 Clayton, NC 27528-0879 State of North Carolina | Environmental Quality | Water Resources 1628 Mail Service Center, Raleigh, NC 27699-1628 919-791-4200 SUBJECT: NOTICE OF VIOLATION Tracking Number: NOV-2017-LV-0453 Permit No. NC0025453 Little Creek WWTP Johnston County hS Water Resources ENVIHONMBNrAL QUAUTV ROY COOPER Governor MICHAEL S. REGAN Secretary S. JAY ZIMMERMAN Director Dear Mr. Lindsay: A review of the April 2017 Discharge Monitoring Report (DMR) for the subject facility revealed the violation(s) indicated below: Parameter BOD, 5-Day (20 Deg. C) ~ Concentration (CO310) BOD, 5-Day (20 Deg. C) - Concentration (CO310) Certified Mail #7016 3560 0000 4428 7731 Return Receipt Requested Remedial actions, if not already implemented, should be taken to correct any noted problems. The Division of Water Resources may pursue enforcement actions for this and any additional violations. If the violations are of a continuing nature, not related to operation and/or maintenance problems, and you anticpate reme; la construction activities, then you may wish to consider applying for a Special Order by Consent (SOC). Mitchell Hayes of the Cc: If you have any questions concerning this Raleigh Regional Office at 919-791-4200. Danny Smith, Regional Supervisor Water Quality Regional Operations Section Raleigh Regional Office Division of Water Resources, NCDEQ State of North Carolina | Environmental Quality | Water Resources 1628 Mail Service Center, Raleigh, NC 27699-1628 919-791-4200 iO^er or to apply for an SOC, please con^fe Sincerely, (J WQS Raleigh Regional Office - Enforcement File NPDES Compliance/Enforcement Unit - Enforcement File Central Files August 9Z 2017 Dear Mr. Lindsay: Limit Exceedance Deficiency(s): Parameter Date 001 Effluent 5/22/2017 Daily Minimum Not Reached65.7 001 Effluent 5/25/2017 Daily Minimum Not Reached65.8 001 Effluent 5/26/2017 Daily Minimum Not Reached65.6 A review of the May 2017 Discharge Monitoring Report (DMR) for the subject facility revealed the deficiency(s) indicated below: Please be aware that non-compliance with your permit could result in enforcement action by the Division of Water Resources for these and any additional violations of State law. The Raleigh Regional Office encourages you to take all necessary actions to bring your facility into compliance. Sample Location Limit Value Adam Lindsay, Town Manager Town of Clayton PO Box 879 Clayton, NC 27528-0879 SUBJECT: NOTICE OF DEFICIENCY Tracking Number: NOD-2017-LV-0082 Permit No. NC0025453 Little Creek WWTP Johnston County ND Water Resources ENVIftCKMCNT*u QUALIFY State of Nonh Carolina I Environmental Quality I Water Resources 1628 Mail Service Center, Raleigh. NC 27699-1628 919-791-4200 ROY COOPER Gwmar MICHAEL S. REGAN Suirsfory S JAY ZIMMERMAN DllfcfOr Oxygen, Dissolved (DO) (00300) Oxygen, Dissolved (DO) (00300) Oxygen, Dissolved (DO) (00300) Reported Value Type of Deficiency in, please contact Mitchell Cc:WQS Raleigh Regional Office - Enforcement File NPDES Compliance/Enforcement Unit - Enforcement File Sincerely, Danny Smith, 'Regional Supervisor Water Quality Regional Operations Section Raleigh Regional Office Division of Water Resources, NCDEQ State of North Carolina Environmental Quality Water Resources 1628 Mail Service Center, Raleigh, NC 27699-1628 919-791-4200 If you should need any assistance or wou^^e to discuss this non-compliance siti Hayes of the Raleigh Regional Office at 919-791-4200. December 11, 2017 Dear Mr. Lindsay: 2. The 2.5 MGD water reclamation facility consists of the following units: influent head works with a biofilter odor control system; mechanical and automatic bar screens; a vortex type grit removal system; influent pump station with three (3) 60-Hp dry pit submersible pumps and one (1) 40-Hp pump; 9-inch Parshall flume with ultrasonic flow meter; a 214,500 gallon anaerobic selector tank in front of the first stage anoxic tank; a 300,000 gallon first stage anoxic tank in front of oxidation basin # 2; two (2) - oxidation basins; a 200,000 gallon first stage anoxic tank in front of oxidation basin # 1; three (3) secondary clarifiers; Return Activated Sludge pump station; two (2) shallow bed DAVCO traveling bridge type tertiary filters; UV disinfection, two banks, with back-up chlorination / dechlorination; effluent pump station; one (1) 90,000 gallon aerated digester/sludge stabilization tank; two (2) - 360,000 gallon aerated sludge holding tanks; sludge loading station; a sludge thickening building containing two (2) rotary drum thickeners with polymer flocculation; sludge transfer pump station; sludge drying beds; in-plant non-potable water system using reclaimed treated wastewater; a reclaimed water pump station and transmission force main to the Pine Hollow Golf Course and two (2) on-site generators and one portable generator to provide back-up power. Water Resources Fnvircnnieni.il Quality <i>^Nothfng Compares Division of Water Resources. Raleigh Regional Office. Water Quality Operations Section 1628 Mail Service Center, Raleigh, NC 27699-1628 Location: 3800 Barrett Drive. Raleigh. NC 27609 http: portal.ncdenr.org web wq aps Phone: (919)791-4200 Fax: (919)788-7159 ROY COOPER (r'oi enior MICHAEL S. REGAN Secreriirv Linda Culpepper /merini Direcior Adam Lindsay, Town Manager Town of Clayton P.O. Box 879 Clayton, NC 27520 Mitch Hayes of the Raleigh Regional Office conducted the subject inspection on December 7, 2017. The assistance of James Warren, grade WW-4 Operator in Responsible Charge (ORC) and Bill Simpson, Laboratory Supervisor, with this inspection was greatly appreciated. Please find attached to this letter the Basinwide Information Management System (BIMS) check list summarizing the inspection. Below is list of findings developed from the inspection and review of the permit. Subject: Compliance Evaluation Inspection Town of Clayton - Little Creek Water Reclamation Facility NPDES Permit Number NC0025453 Johnston County 1. Permit NC0025453 became effective May 1, 2014 and will expire March 31, 2018. Your permit renewal was received in the Water Quality Permitting Section on September 29, 2017 and is currently under review. 3. 5. this letter, please contact Mitch 227/ cc: permit files, central files Hayes at 919.791.4200 or at mitch.hayes@ncdenr.gov Sincerely, Danny Smith,/Regional Supervisor Water Quality Regional Operations Section Raleigh Regional Office Division of Water Resources, NCDEQ I would like to thank James Warren and Bill Simpson for their time and assistance with this inspection. If you have any questions about the inspection or t At the time of inspection, the biofilter odor control system appear to be operating normally. The automatic and manual bar screens and vortex grit removal system were functioning normally. The number 1 aerated sludge holding tank was approximately 40% full. The number 2 aerated sludge holding tank was approximately 80% full. Aerators in sludge holding tank number 1 and 2 were operational. Both rotary drum thickeners were being operated. Thickened sludge is taken to the Johnston County Landfill or the Triple S Farms. Influent in the two oxidation basins was medium brown in color with very little foam in oxidation ditch #1. Foam covered about 30% of the surface area in ditch #2. Covers have been placed over the anaerobic selector to prevent odor. The #1 secondary clarifier was taken down for general maintenance. Effluent appeared clear flowing off the weirs in secondary clarifiers 2 and 3. Effluent in the wet well at the tertiary filters appeared clear with no foam. One bank of UV disinfection lights was being operated due to low flow. The sludge drying beds had no sludge in them. Effluent at the discharge point in the Neuse River appeared clear with no foam or solids. 4. The laboratory was checked in a cursory manner. Little Creek Wastewater WRF laboratory analyzes BOD, TSS, fecal coliform, Phosphorus, Nitrate, COD and is field certified for TRC. pH, temperature, DO, specific conductance. Environment 1 is the contract lab that analyzes all other parameters. All instruments, meters, probes, photometric cells are maintained in good condition. All standards, reagents and consumables used are within expiration dates. Discharge Monitoring Reports (DMR's) for the period October 2015 through October 2017 were reviewed for compliance with permit limits and monitoring requirements. Weekly and monthly permit limit violations for BOD were noted in April 2017. There were three days in May 2017 for not meeting minimum dissolved oxygen limit. These violations have been addressed. There were no other violations listed for the review period. 6. Commercial lab results, chain of custody records, and bench sheets were compared with data submitted on the DMR for October 2017. No discrepancies were noted. EPA Section A National Data System Coding (i.e. PCS) Inspection Typeyr/mo/dayNPDES I11NC0025453 17/12/0? 21 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I6116 Bl QA --------Reserved-- I 72 |8073 Section B Facility Data Entry Time/Date Permit Effective Date 14/05/0110:30AM 17/12/07 Little Creek VWVTP Exit Time/Date1000 Durham St 17/12/0701 30 PMClayton NC 27520 Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)Other Facility Data Contacted No Section C: Areas Evaluated During Inspection (Check only those areas evaluated) 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 RR0WQ//919-791-4200/ / // 2-C> U r iPage# Name and Location of Facility Inspected (For Industrial Users discharging to POTW also include POTW name and NPDES oermit Number) Flow Measurement Sludge Handling Disposal | Operations & Maintenance | Records/Reports | Facility Site Review | EffluenVReceiving Waters B Permit B Self-Monitoring Program B Laboratory /// Charles Elwood Harrell/ORC/919-553-1535/ James O Warren//919-553-1536 / James O Warren/ORC/919-553-1536/ Form Approved. OMB No. 2040-0057 Approval expires 8-31-98 Permit Expiration Date 18/03/31 Name, Address of Responsible Official/Title/Phone and Fax Number L! r\ds^.y -■Steven-Biggs PO Box 879 Clayton NC 27520/Town Manager/919-553-5866/9195531541 United States Environmental Protection Agency Washington. D.C. 20460 Water Compliance Inspection Report Inspector 19 Date N Inspection Work Days 671 Transaction Code 1 12L Fac Type 20 u Facility Self-Monitoring Evaluation Rating 70 LJ J17 LN74 75l I I I I I I I 31 Mitchell S Hayes Signature of Management A Reviewer/ Agency/Office/Phone and Fax Numbers EPA Form 3&60-3 (Rev 9-94) Previous editions are obsolete. 18^J 71 u 2 LJ 1NPDES(Cont.) 3[NC0025453 17/12/07 Section D Summary of Fmding/Comments (Attach additional sheets of narrative and checklists as necessary) 2Page# 12[ The 2.5 MGD water reclamation facility consists of the following units influent head works with a biofilter odor control system: mechanical and automatic bar screens; a vortex type grit removal system: influent pump station with three (3) 60-Hp dry pit submersible pumps and one (1) 40-Hp pump: 9-inch Parshall flume with ultrasonic flow meter: a 214.500 gallon anaerobic selector tank in front of the first stage anoxic tank: a 300.000 gallon first stage anoxic tank in front of oxidation basin # 2; two (2) - oxidation basins: a 200.000 gallon first stage anoxic tank in front of oxidation basin # 1: three (3) secondary clarifiers; Return Activated Sludge pump station: two (2) shallow bed DAVCO traveling bridge type tertiary filters: UV disinfection, two banks, with back-up chlorination / dechlorination: effluent pump station; one (1) 90.000 gallon aerated digester/sludge stabilization tank; two (2) - 360,000 gallon aerated sludge holding tanks: sludge loading station: a sludge thickening building containing two (2) rotary drum thickeners with polymer flocculation; sludge transfer pump station: sludge drying beds; in-plant non-potable water system using reclaimed treated wastewater; a reclaimed water pump station and transmission force main to the Pine Hollow Golf Course and two (2) on-site generators and one portable generator to provide back-up power. At the time of inspection, the biofilter odor control system appear to be operating normally. The automatic and manual bar screens and vortex grit removal system were functioning normally. The number 1 aerated sludge holding tank was approximately 40% full. The number 2 aerated sludge holding tank was approximately 80% full. Aerators in sludge holding tank number 1 and 2 were operational. Both rotary drum thickeners were being operated. Thickened sludge is taken to the Johnston County Landfill or the Triple S Farms. Influent in the two oxidation basins was medium brown in color with very little foam in oxidation ditch #1. Foam covered about 30% of the surface area in ditch #2. Covers have been placed over the anaerobic selector to prevent odor. The #1 secondary clarifier was taken down for general maintenance. Effluent appeared clear flowing off the weirs in secondary clarifiers 2 and 3. Effluent in the wet well at the tertiary filters appeared clear with no foam. One bank of UV disinfection lights was being operated due to low flow. The sludge drying beds had no sludge in them. Effluent at the discharge point in the Neuse River appeared clear with no foam or solids. The laboratory was checked in a cursory manner. Little Creek Wastewater WRF laboratory analyzes BOD. TSS, fecal coliform, Phosphorus. Nitrate, COD and is field certified for TRC. pH, temperature, DO, specific conductance. Environment 1 is the contract lab that analyzes all other parameters. All instruments, meters, probes, photometric cells are maintained in good condition. All standards, reagents and consumables used are within expiration dates. Discharge Monitoring Reports (DMR’s) for the period October 2015 through October 2017 were reviewed for compliance with permit limits and monitoring requirements. Weekly and monthly permit limit violations for BOD were noted in April 2017. There were three days in May 2017 for not meeting minimum dissolved oxygen limit. These violations have been addressed. There were no other violations listed for the review period. Commercial lab results, chain of custody records, and bench sheets were compared with data submitted on the DMR for October 2017. No discrepancies were noted. I11 J17 yr^j^ay Inspection Type 18 [c] Operations & Maintenance Yes No NA NE Is the plant generally clean with acceptable housekeeping? Comment: Permit Yes No NA NE 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? There are no special conditions. Permit renewal received September 29, 2017Comment: 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 DM Rs? Is the chain-of-custody complete? Dates, times and location of sampling Name of individual .performing the sampling BResults of analysis and calibration ElDates of analysis BName 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? □an 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? 3Page# Does the facility analyze process control parameters, for ex: MLSS. MCRT, Settleable Solids. pH, DO. Sludge Judge, and other that are applicable? (If the facility is = or > 5 MOD permitted flow) Do they operate 24/7 with a certified operator on each shift? Bonn Bonn m a s anna B 0 Permit: NC0025453 Inspection Date: 12/07/2017 a anna a a n anna nan anna a (If the present permit expires in 6 months or less). Has the permittee submitted a new application? Owner - Facility: Little C.^ek WWTP Inspection Type: Compliance Evaluation Little Comment: Effluent Pipe Effluent appeared clear with no foam.Comment: Flow Measurement - Influent # Is flow meter used for reporting? Is flow meter calibrated annually? Effluent meter used for reportingComment: Yes No NA NEFlow Measurement - Effluent # Is flow meter used for reporting? Is flow meter calibrated annually? Comment: Drying Beds 4Page# Is there adequate drying bed space? Is the sludge distribution on drying beds appropriate? Are the drying beds free of vegetation? # Is the site free of dry sludge remaining in beds? # Is the sludge land applied? (Vacuum filters) Is polymer mixing adequate? Is the flow meter operational? (If units are separated) Does the chart recorder match the flow meter? Is the flow meter operational? (If units are separated) Does the chart recorder match the flow meter? Is the site free of stockpiled sludge? Is the filtrate from sludge drying beds returned to the front of the plant? # Is the sludge disposed of through county landfill? Owner - Facility. Inspection Type. M anna h ■ Permit: NC0025453 Inspection Date: 12707/2017 ^^WWTP Compliance Evaluation Record Keeping Facility has copy of previous year's Annual Report on file for review? Yes No NA NE ■ Yes No NA NE ■ ■ B anna Yes No NA NE anna anna □an 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? Yes No NA NE a a ■ ■ B H E H H Little Fk WWTP Drying Beds Yes No NA NE 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?■ Comment. Solids Handling Equipment Yes No NA NE Is the equipment operational? ■ Is the chemical feed equipment operational? Is storage adequate? Is the site free of high level of solids in filtrate from filter presses or vacuum filters? Is the site free of sludge buildup on belts and/or rollers of filter press? B Is the site free of excessive moisture in belt filter press sludge cake? ® The facility has an approved sludge management plan? Comment: Pump Station - Effluent Yes No NA NE Is the pump wet well free of .bypass lines or structures? B Are all pumps present? B Are all pumps operable? ® Are float controls operable? Is SCADA telemetry available and operational? 0 Is audible and visual alarm available and operational? Comment' Pump Station - Influent Yes No NA NE m Is the pump wet well free of bypass lines or structures? m Is the wet well free of excessive grease? 5Page# 2 rotary drum thickeners are used in the process. Sludge is landfilled at the Johnston County landfill or at Triple S Farms. Permit: NC0025453 Inspection Date: 12/07/2017 Owner - Facility: Inspection Type: Compliance Evaluation There are two aerated sludge holding tanks. One is used to thickened sludge, the other is used for storage. The thickened sludge tank was approximately 30% full, the other tank was approximately 80% full. Yes No NA NEPump Station - Influent 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: Yes No NA NEBar Screens Type of bar screen a.Manual b.Mechanical Are the bars adequately screening debris? ■ Is the screen free of excessive debris? B Is disposal of screening in compliance? B Is the unit in good condition? Comment: Yes No NA NEGrit Removal Type of grit removal a.Manual lab.Mechanical a Is the grit free of excessive organic matter? H Is the grit free of excessive odor? ® # Is disposal of grit in compliance? Comment: Yes No NA NENutrient Removal ® # Is total nitrogen removal required? m # Is total phosphorous removal required? Type # Is chemical feed required to sustain process? BonnIs nutrient removal process operating properly? Comment: 6Page# Owner - Facility: Inspection Type: anna Bonn Bonn Bonn Bonn Permit: NC0025453 Inspection Date: 12/07/2017 Little ^^WWTP Compliance Evaluation Biological 0. Little’ Nutrient Removal Yes No NA NE Filtration (High Rate Tertiary)Yes No NA NE Type of operation:Down flow ■ 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? There are two (2) shallow bed DAVCQ traveling bridge type tertiary filtersComment Disinfection - UV Yes No NA NE H Are extra UV bulbs available on site? n Are UV bulbs clean? a Is UV intensity adequate? a Is transmittance at or above designed level? Is there a backup system on site? a Is effluent clear and free of solids? Chlorination and dechlorination are used as back-up systemComment: Standby Power Yes No NA NE E Is automatically activated standby power available? Is the generator tested by interrupting primary power source? s Is the generator tested under load? ® Was generator tested & operational during the inspection? E Do the generator(s) have adequate capacity to operate the entire wastewater site? E Is there an emergency agreement with a fuel vendor for extended run on back-up power? ® Is the generator fuel level monitored? Generators were not tested during the inspectionComment: Pumps-RAS-WAS Yes No NA NE IS Are pumps in place? IB Are pumps operational? 7Page# Owner - Facility: Inspection Type: Permit: NC0025453 Inspection Date: 12/07/2017 WWTP Compliance Evaluation Yes No NA NEPumps-RAS-WAS ■ Are there adequate spare parts and supplies on site? Comment: Yes No NA NELaboratory # Is the facility using a contract lab? Incubator (BOD) set to 20.0 degrees Celsius +/- 1.0 degrees? Environment 1 is used as the contract laboratory. All temperatures were within permit limits.Comment. Yes No NA NEInfluent Sampling # Is composite sampling flow proportional? Is sample collected above side streams? Is proper volume collected? Is the tubing clean? H Comment: Yes No NA NEEffluent Sampling Is composite sampling flow proportional? Is sample collected below all treatment units? Is proper volume collected? Is the tubing clean? H Comment: 8Page# Are field parameters performed by certified personnel or laboratory9 Are all other parameters(excluding field parameters) performed by a certified lab? # Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees Celsius)? Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees? # Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees Celsius)? Is sampling performed according to the permit? # 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)? Permit: NC0025453 Inspection Date: 12/07/2017 ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ® ■ H ■ ■ Owner - Facility: Lltt'e WWP Inspection Type: Compliance Evaluation WWTPLittle'Permit: NC0025453 Compliance EvaluationInspection Date: 12/07/2017 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)?a ■ Is the overflow clear of excessive solids/pin floc? H Is the sludge blanket level acceptable? (Approximately !4 of the sidewall depth) Comment: Aeration Basins Yes No NA NE Mode of operation Ext. Air Type of aeration system Surface ® Is the basin free of dead spots? H Are surface aerators and mixers operational? E Are the diffusers operational? H Is the foam the proper color for the treatment process? ® Does the foam cover less than 25% of the basin's surface? 11 Is the DO level acceptable? o Is the DO level acceptable?(1.0 to 3.0 mg/l) More foam was noted in ditch #2Comment: 9Page# Owner - Facility: Inspection Type: SB in secondary clarifier 3 was 2.5 feet. SB in secondary clarifier 2 was 7.0 feet. Both have 14 feet sidewall depth. > 1