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Home My WebLink AboutNC0020389_Compliance Evaluation Inspection_20200224 Y a ROY COOPER Governor MICHAEL S.REGAN Secretary S.DANIEL SMITH NORTH CAROLINA Director Environmental Quality February 24. 2020 Fredrick D. Nelson, Town Manager Town of Benson 303 E. Church Street Benson, NC 27504 Subject: Compliance Evaluation Inspection Benson WWTP NPDES Permit NCO020389 Johnston County Dear Mr. Nelson, On Monday, February 17, 2020, Zaeh Thomas and Jason Robinson of the Raleigh Regional Office of the Division of Water Resources conducted a compliance evaluation inspection of tile treatment facilities located at the Benson WWTP. The purpose of this inspection was to ensure compliance with the subject NPDES permit. During the inspection. the presence and cooperation of Brian Leavitt, Operator in Responsible Charge (ORC). Tim Robbins (Director of PU), Steve Procter(BUORC & Lab Supervisor). Brian Gay and other staff was helpful and appreciated. The Benson WWTP is located at 770 Hannah Creek Road. Four Oaks, North Carolina. The WW-4 facility is permitted and authorized to discharge 1.9 MGD of treated wastewater through Outfall 001 into Hannah Creek. classified C-NSW, as part of the Neuse River Basin. This NPDES compliance evaluation inspection consisted of the following: • Review of the NPDES permit; • Review of the owner/facility information; • Review of ORC log books and other operation documents: • Review of August 2018- January 2020 monitoring data; • Review of August 2018—January 2020 compliance history; • On-site inspection of the laboratory; • On-site inspection of the wastewater treatment units. Findings during the inspection were as follows: I. The current NPDES permit was issued effective on September 1, 2013, and expired on April 30, 2018. A copy was available on-site. The Division received the permit renewal application for the facility on September 18, 2017 and is currently under review, M ,,A North Carolina Department of Environmental Quality I Division of Water Resources _ Raleigh Regional Offi,e 13800 Barrett Drive I Raleigh.North Carolina 27bO9 919.7914200 2. As listed in the subject permit, the treatment components include: one(I)are bar screen, grit removal system,dual manual bar screens, parshall flume with flow measurement, influent composite sampler, three(3) influent screw pumps,three(3)oxidation ditches(Ditches #1 & #3 are used for aeration and ditch#2 is kept anoxic for nutrient removal), five(5)secondary clarifiers,a return and waste sludge pump station, five(5)tertiary filters, a chlorine contact basin (changed from gas to liquid since last inspection), a dechlorination basin with post aeration, an effluent flow meter(used for reporting;), effluent composite sampler, one(1) concrete lined sludge lagoon(not currently aerated), and two(2) stabilization lagoons/influent flow storage,and backup generator. Chemical feed systems(alum and lime)are no longer used in treatment process. 3. For the review period August 2018—January 2020, DMR violations and enforcement actions (Notices of Deficiency,Notices of Violation, or Civil Penalty Assessments)were issued. These actions were handled in separate correspondence. During this inspection, DWR staff also evaluated whether the remediation efforts requested from last inspection were performed. Many improvements were made to the facility and are detailed in item t•7 below. 'I. The inspector compared February 2019 and July 2019 DMR data against the bench and analytical data. No discrepancies were noted. For the review period, Benson WWTP has been compliant with its Whole Effluent Toxicity limit and monitoring requirements(July 2019 results indicated a"fail", samples were collected the two following months and results indicated a"pass''.). 5. The laboratory at Benson WWTP operates under field certification#196 and analyzes the following parameters: pl-1, temperature, dissolved oxygen, chlorine,TP, TSS, local coliform, and conductivity. All other parameters are analyzed by Environment I or Meritech Inc. A brief inspection of the meter calibration logs and standards showed the Benson WWTP laboratory to be compliant with record- keeping;requirements. Disposable NISI certified thermometers, which are good for I year, are used by the operators to measure temperature. 6. The ORC logbook was complete and contained detailed information that included daily clarifier sludge levels, freeboard levels,etc. The 2019 Annual Report was provided and is available as of January 2020 for review on the Town's website in addition to being posted at Town Mall. 7. The following treatment units.were evaluated during this inspection: a) Arc/manual bar screens: Debris is collected in a rolling;trash bin, then placed in a dumpster and picked up by waste management. The ORC has implemented a higher frequency of observation to mitigate issues. During;the inspection,the chain inside of the unit came undone and was attended to immediately. The unit is noticeably older, rusted, and staff expressed a want to replace the entire arc bar unit to increase efficiency. b) Grit removal system: The unit«as offline and actively being rehabbed on the day of inspection. It was scheduled to be brought back online that afternoon. Repairs were made to the concrete floor and walls,surfaces of unit and motor were painted and coated to help prevent breakdown. Please notify this office tit-hen the writ is filly brought hack online. c) Influent flow meter& sampler: The influent flow meter was last calibrated 8-30-2019 by Clearwater. The sampler temperature was noted as 3.1 degrees Celsius. The previous inspection noted that samples were being collected at a rate that did not meet permit requirements. The sampler is now set to collect 120 mL samples and is flow proportional. d) Screw pumps: 2 of the 3 screw pumps .vere in operation. The other scree pumps motor was to be replaced and staff are waiting on the part to arrive. Please not f►,this office when the third screir pump is brought back online. e) Oxidation ditches: Ditches#1 & #3 are used for aeration and Ditch #2 is kept anoxic for nutrient removal. The previous inspection noted that multiple rotors were inoperable. Rotor#1 in Ditch #1 has been rehabbed. Concrete has been repaired and the motor has been replaced. An electrical part is on order and will be installed shortly after to bring the rotor back online. All other rotors appeared to be in working order; Ditch 92 did not have any rotors running due to it being the designated anoxic zone. f) Clarifiers: The previous inspection revealed only 3 of the 5 clarifiers were operable. Repairs have been made and now all five clarifiers are in good working order. Sludge blankets are measured and documented once per day and more frequently under inclement weather. Blanket levels appeared to be compliant. Of the 5 clarifiers, 2 are 10 ft. in depth, 2 are 12 ft. in depth and the larger is 1511. in depth. Algae is cleaned from the weirs weekly or as needed and placed in the sludge wasting pit to be sent to the sludge holding lagoon. g) Sludge Pump Station: New pumps and electrical equipment were added or replaced in the pump house to better regulate flow to the different treatment units and the lagoon. h) Tertiary Filters: The previous inspection revealed that only 3 of the 5 filters were operable. Repairs have been made and 4 of 5 are back online. The 5"' filter contains broken plates that are no longer manufactured. Staff are looking into best options for bringing this unit back online. All operable filters are backwashed on NI, W, F or as needed and appeared to be operating sufficiently. i) Disinfection: Per the ORC,the plant has changed from using gas to liquid sodium hypochlorite after discussing the change with Central Office staff. Waterguard is scheduled to supply material every two weeks. The facility keeps a powder mix as a back-up. Estimated contact time in the chamber is 30 minutes. j) De-chlorination and post aeration: Calcium thiosulfate is added and the effluent is post aerated by units from the bottom of the chamber. Waterguard also supplies this material. k) Effluent flow meter& sampler: The effluent flow meter is used for reporting and was last calibrated 8-30-2019 by Clearwater. The meter display showed 1.88 MGD at approximately 1 1:40 AM. The sampler temperature was noted as 3.0 degrees Celsius. The previous inspection noted that samples were being collected at a rate that did not meet permit requirements. The sampler is now set to collect 120 rnL samples and is flow proportional. 1) Standby Power: The generator on site is equipped to provide power for the entire plant. The unit is manually tested. The ORC stated that it has been several months since a test was last performed. D1PR staff reconuireilded testirtg7rttto-te.stiiig the generator on a regular basis and periodically under load 6virh crppropricrre clactopienlation) to ensure that it will ftoiction properly: when necessctrj� rm) Treatment lagoons: The facility contains three(3) lagoons. Lagoon I is the larger lagoon located on the SW side of the plant. It is clay lined with a concrete curtain and is used as an equalization basin (flow is diverted from the headworks unit). Lagoon 2 is the smaller lagoon located on the SE side of plant. It is clay lined with a concrete curtain and is also used as an equalization basin. The third lagoon is completely concrete and is used as sludge waste containment with a capacity of approximately 3MG. It contains aerators, but are currently not in use until more sludge can be removed. A previous inspection revealed an overflow that occurred from the sludge lagoon, high freeboard levels,and excessive amounts of vegetation growing inside of the units; this resulted in PC-2018-0019. Sludge has since been extracted from the lagoons and cleanup efforts have been performed. Staff stated that approximately 1500 tons of sludge and vegetation have been removed from Lagoon #2. In addition, debris and sludge has been removed from the sludge wasting lagoon itself. Facility staff stated that they anticipate another round of debris removal from the lagoons in the coming months. Freeboard levels in both EQ basins are checked daily and documented. At the time of inspection, freeboard levels in the sludge lagoon were compliant. Please describe the location cued process in tivhichfcrcifY stuff checkft•eebocu•d levels daily to ensure comj)ha rce ivith the?fool fi•eebocrrd requirements Stated in A. (6). of the issued permit. 8. The inspector observed the effluent discharge to Hannah's Creek via the outfall pipe to be clear with no observable solids or foam. No detrimental impacts from the effluent discharge were observed. The area around the outfall pipe was clear and accessible. It appears to have a ''Y-split''and discharges from two separate outlets in the same location. Please verify this crud describe location af' split. 9. The ORC and Public Utility Director stated that in addition to the cleanup of the lagoons, repair of the rotors inside of the oxidation ditches and maintenance/replacement of'screen units are a top priority. Prioritizing these items will help ensure efficiency, help prevent damage to downstream units, and protect the Town's recent investments at the treatment facility. Please address the conditions outlined in numbers 7 (b, d, c, 1, m) & 8 of this letter and notify the inspector at the contact information below within 45 days of receipt of this letter. If you have questions or comments about the inspection, this report or the requirements to take corrective action (if applicable),please contact: Zach Thomas at 919-791-4247 or via email at zacharn.thonias a ncdenr.aov. Sincerely, Scott Vinson Regional Supervisor Water Quality Regional Operations Section Raleigh Regional Office Division of Water Resources, NCDEQ Attachments: EPA Water Compliance Inspection Report Cc: Brian Leavitt, ORC (via email: bleaN itt et to«nofbenson.coni) Tim Robbins, Public Utilities Director(via email: trobbins-a to«notbenson.com) RRO Files Laserliche Uniled States Environmental Protect'. n Agen.y Form Approved. EPA Washmgtan 0 C 20460 OMB No 204MO57 Water Compliance Inspection Report Approval expires 8-31-98 Section A:National Data System Coding(i.e..PCS) Transaction Code NPDES yrrmolday Inspection Type Inspector Fac Type ' U 2 u 3 1 NC0020389 11 121 20102:17 I17 18 [1 c` 19 I LJ L! I 201J 21L_Ll J 6 Inspection Work Days Facility Self-Monitoring Evaluation Rating B1 oA ••-• Reserved 67 70 L—I 71 t J 72 u ) 73 !74 751 I I I I I I80 Section B:Facility Data L Name and Location of Facility Inspected(For industrial Users discharging to POTW.also inc3udo Entry Time/Dale Perm I Effective Date POTW name and NPDES Permit Number) 10 00AM 20/02/17 13/09/01 Benson WWTP 770 Hannah Creek Rd Exit TimofDate Permit Expiration Date Benson NC 27504 12 15PM 20/02/17 18104-30 Name(s)of Onsile Representative(s)1Tittes(s)IPhone and Fax Number(s) Other Facility Data 111 Brian Peter Leavitt/ORC1919-894-2373/ Name,Address of Responsible Ol6ciallTitlelPhone and Fax Number Keith Ryker Langdon,PO Box 69 Benson NC 2750400691Town Ccntacled Manager191 9-894-4 953191 9894 1 28 3 No Section C:Areas Evaluated During Inspection(Check only those areas evaluated) Permit N Flow Measurement Operations&Maintenance Records/Reports Self-Monitoring Program Sludge Handling Disposal Facility Site Review i Compliance Schedules Ef(IuentlReceiving Waters Laboratory Section D:Summary of Finding/Comments(Attach additional sheets of narrative and checklists as necessary) (See attachment summary) Name(s)and Signature of I`nssppector s) 4 Agency/Office/Phone and Fax Numbers Date Jason T Robinson 4 ! ✓r- DWRIRRO WOI919-791-42001 Zachary ThomasDWRIRRO Wo1919-791.42001 fj L'{-il"`f Signature of M nagement 0 A Reviewer Agency/Office/Phone and Fax Numbers Date y120 20 EPA Form 3560-3(Rev 9-94)Previous editions are obsolete. Page# 1 NPOES yrlmolday Inspection Type 1 31 NCO020389 11 1 12+ 20102/17 117 18 1 C 1 Section D:Summary ofl Find ing/Comments(Attach additional sheets of narrative and checklists as necessary) Please see report for details. f>ageN 2 Permit: NCO020389 Owner-Facility: Benson WWTP Inspection Date: 021M2020 Inspection Type: Compliance Evaluation Compliance Schedules Yes No NA NE Is there a compliance schedule for this facility? ❑ ❑ ❑ a Is the facility compliant with the permit and conditions for the review period'? 0 ❑ ❑ ❑ Comment: 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? ■ ❑ ❑ ❑ #Are there any special conditions for the permit? ❑ 0 ❑ ❑ Is access to the plant site restricted to the general public? M ❑ ❑ ❑ Is the inspector granted access to all areas for inspection? 0 ❑ ❑ ❑ Comment: The Division received the permit renewal application for the facility on September 18, 2017 and is currently under review. Record Keepina Yes No NA NE Are records kept and maintained as required by the permit? M ❑ ❑ ❑ Is all required information readily available, complete and current? 0 ❑ ❑ ❑ Are all records maintained for 3 years(tab, reg. required 5 years)? 0 ❑ ❑ ❑ Are analytical results consistent with data reported on DMRs? 0 ❑ ❑ ❑ Is the chain-of-custody complete? Cl ❑ ❑ Dates, limes 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? a ❑ ❑ ❑ 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 2417 with a certified operator ❑ ❑ M ❑ 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? ❑ ❑ Cl 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? ❑ ❑ ❑ Page# 3 Permit: NCO020389 Owner-Facility: Ronson WWTP Inspection Date: 02/17/2020 Inspection Type: Compliance Evaluation Record Keeping Yes No NA NE Facility has copy of previous year's Annual Report on file for review? No ❑ ❑ Comment Operations & Maintenance Yes No NA NE Is the plant generally clean with acceptable housekeeping? 0 ❑ ❑ ❑ Does the facil.ty analyze process control parameters,for ex:MLSS, MCRT, Settleable ❑ ❑ ❑ Solids, pH,DO,Sludge Judge,and other that are applicable? 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? M ❑ ❑ ❑ #Is the facility using a contract lab? a ❑ ❑ ❑ #Is proper temperature set for sample storage(kept at less than or equal to 6.0 degrees 0 ❑ ❑ ❑ Celsius)? Incubator(Fecal Coliform)set to 44.5 degrees Celsius+/_0.2 degrees? a ❑ ❑ ❑ Incubator(BOD)set to 20.0 degrees Celsius+1- 1.0 degrees? ❑ ❑ M ❑ Comment: Field Cert# 1969 some parameters are analyzed by Environment 1 or Meritech. Influent Sampling Yes No NA NE #Is composite sampling flow proportional? 0 ❑ ❑ ❑ Is sample collected above side streams? M ❑ ❑ ❑ Is proper volume collected? 8 ❑ ❑ ❑ Is the tubing clean? 0 ❑ ❑ ❑ #Is proper temperature set for sample storage(kept at less than or equal to 6.0 degrees M ❑ ❑ ❑ Celsius)? Is sampling performed according to the permit? ❑ ❑ ❑ Comment: The sampler temperature was noted as 3.1 decirees Celsius. Flow Measurement - Influent Yes No NA NE #Is Flow meter used for reporting? ❑ M ❑ ❑ Is flow metcr calibratcd annually? M ❑ ❑ ❑ Is the flow meter operational? o ❑ ❑ ❑ (if units are separated)Does the chart recorder match the flow meter? ❑ ❑ M ❑ f age# 4 Permit: NCO020389 Owner-Facility: Berison WWTP Inspection Date: 02117.-2020 Inspection Type: Compliance Evaluation Flow Measurement-Influent Yes No NA NE Comment. The influent flow meter was last calibrated 8-30-2019 by Clearwater. Bar Screens Yes No NA NE Type of bar screen a.Manual b.Mechanical Are the bars adequately screening debris? M ❑ ❑ ❑ Is the screen free of excessive debris? 0 ❑ ❑ ❑ Is disposal of screening in compliance? 0 ❑ ❑ ❑ Is the unit in good condition? 0 ❑ ❑ ❑ Comment: Debris is collected in a rolling trash bin,then iced in a dumpster and picked up by waste management. The ORC has imalemented_a_higher frequency of observation to mitigate issues. During the inspection, the chain inside of the unit came undone and was attended to immediately. The unit is noticeably older, rusted, and staff expressed a want to replace the entire arc bar unit to increase efficiency. 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? ❑ ❑ ❑ a #Is disposal of grit in compliance? ■ ❑ ❑ ❑ Comment: The unit was offline and actively being rehabbed on the day of inspection. It was scheduled to be brought back online that afternoon. Repairs were made to the concrete floor and walls, surfaces of unit and motor were painted and coated to help prevent breakdown. Staff is to notify DWR when brought back online. Equalization Basins Yes No NA NE Is the basin aerated? ❑ ❑ 0 ❑ Is the basin free of bypass lines or structures to the natural environment? ❑ ❑ ❑ Is the basin free of excessive grease? 0 ❑ ❑ ❑ Are all pumps present? M ❑ ❑ ❑ Are all pumps operable? 0 ❑ ❑ ❑ Are float controls operable? ❑ ❑ ❑ Page# 5 Permit.' NCO020389 Owner-Facility: Benson W WTP Inspection Date: 0 211 712 02 0 Inspection Type: Compliance Evaluation Equalization Basins Yes No NA NE Are audible and visual alarms operable? ❑ ❑ ❑ 0 #Is basin size/volume adequate? M ❑ ❑ ❑ Comment: Freeboard levels in both EQ basins are checked daily and documented. Staff are to describe location and process in which freeboard levels are checked to ensure permit compliance. See report for more details. Lagoons Yes No NA NE Type of lagoons? Facultative #Number of lagoons in operation at time of visit? 3 Are lagoons operated in? Parallel #Is a re-circulation line present? M ❑ ❑ ❑ Is lagoon free of excessive floating materials? ■ ❑ ❑ ❑ #Are baffles between ponds or effluent baffles adjustable? ❑ ❑ IN ❑ Are dike slopes clear of woody vegetation? 0 ❑ ❑ ❑ Are weeds controlled around the edge of the lagoon? 0 ❑ ❑ ❑ Are dikes free of seepage? ■ ❑ ❑ ❑ Are dikes free of erosion? M ❑ ❑ ❑ Are dikes free of burrowing animals? ❑ ❑ ❑ #Has the sludge blanket in the lagoon(s)been measured periodically in multiple ❑ ❑ ❑ locations? #If excessive algae is present, has barley straw been used to help control the growth? ❑ ❑ E ❑ Is the lagoon surface free of weeds? 0 ❑ ❑ ❑ Is the lagoon free of short circuiting? M ❑ ❑ ❑ Comment: An evaluation of the lagoon depths was performed on 4-23-2019._ Grass area along edge is well maintained. See report for more details. Aerobic Digester Yes No NA NE Is the capacity adequate? a ❑ ❑ ❑ Is the mixing adequate? ❑ ❑ M ❑ Is the site free of excessive foaming in the tank? 0 ❑ ❑ ❑ #Is the odor acceptable? M ❑ ❑ ❑ #Is tankage available for properly waste sludge? ❑ ❑ ❑ Comment: Permit: NC0420jag Owner-Facility: S"son WWTP Inspection Date: 02l17r2020 Inspection Type: Compliance Evaluation Secondary Clarifier Yes No NA NE Is the clarifier free of black and odorous wastewater? M ❑ ❑ ❑ Is the site free of excessive buildup of sol ds in center well of circular clarifier? M ❑ ❑ ❑ 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? N ❑ ❑ ❑ Is the drive unit operational? 0 ❑ ❑ Cl I's the return rate acceptable(low turbulence)? 0 ❑ ❑ ❑ Is the overflow clear of excessive solids?pin floc? ❑ ❑ ❑ Is the sludge blanket level acceptable?(Approximately ,of the sidewall depth) ❑ ❑ ❑ Comment: All five clarifiers are in good working order, Sludge blankets are measured once Per day and more frequently under inclement weather. Blanket levels appeared to be compliant. Of the 5 clarifiers 2 are 10 ft. in de th 2 are 12 ft. in depth and the larger is 15ft. in depth. Algae is cleaned from the weirs weekly or as needed and placed in the sludge wasting it to be sent to the sludge holding lagoon. Oxidation Ditches Yes No NA NE Are the aerators operational? M ❑ ❑ ❑ Are the aerators free of excessive solids build up? 0 ❑ ❑ ❑ #Is the foam the proper color for the treatment process? 0 0 ❑ ❑ Does the foam cover less than 25%of the basin's surface? ❑ ❑ ❑ Is the DO level acceptable? ❑ ❑ ❑ Are seltleometer results acceptable(> 30 minutes)? ❑ ❑ ❑ 0 Is the DO level acceptable?(1.0 to 3.0 mg11) ■ ❑ Are settelometer results acceptable?(400 to 800 mill in 30 minutes) ❑ ❑ ❑ Comment: Rotor#1 in Ditch#1 has been rehabbed. Concrete has been repaired and the motor has been replaced. An electrical part is on order and staff is to notify DWR when it is back online. All other rotors a0peared to be in working order,• Ditch#2 did not have any rotors running due to it being the designated anoxic zone. Nutrient Removal Yes No NA NE #Is total nitrogen removal required? M ❑ ❑ ❑ #Is total phosphorous removal required? 0 ❑ ❑ ❑ Type Biological #Is chemical feed required to sustain process? ❑ ❑ ❑ Page# 7 Permit: NC0020389 Owner-Facility: Benson WWTP Inspection Dale: 02/1712020 Inspection Type: Compliance Evaluation Nutrient Removal Yes No NA NE Is nutrient removal process operating property? ■ ❑ ❑ ❑ Comment: Alum and time are no longer used at the facility. Filtration (High Rate Tertiary) Yes No NA NE Type of operation: Down flaw Is the filler media present? 0 ❑ ❑ ❑ 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? M ❑ ❑ ❑ Comment: 4 of 5 filters are online. The 5th filter contains broken plates that are no longer manufactured. Staff are continuing to look into best options for bringing this unit back online. All operable filters are backwashed on M W F or as needed and appeared to be operating- sufficiently. Solids Handling Equipment Yes No NA NE Is the equipment operational? ❑ ❑ 0 ❑ Is the chemical feed equipment operational? ❑ ❑ ❑ Is storage adequate? ❑ ❑ N ❑ Is the site free of high level of solids in filtrate from filter presses or varuum filters? ❑ ❑ M ❑ Is the site free of sludge buildup on belts and+or rollers of filter press? ❑ ❑ M ❑ Is the site free of excessive moisture in belt filter press sludge cake? ❑ ❑ a ❑ The facility has an approved sludge management plan? 0 ❑ ❑ ❑ Comment: New pumps and electrical equipment were added or replaced in the pump house to better regulate flow to the different treatment units and the lagoon. Disinfection-Liquid Yes No NA NE Is there adequate reserve supply of disinfectant? 0 ❑ ❑ ❑ (Sodium Hypochlorite)Is pump feed system operational? ■ ❑ ❑ ❑ Is bulk storage tank containment area adequate?(free of leaks open drains) 0 ❑ ❑ ❑ Is the level of chlorine residual acceptable? ❑ ❑ ❑ 0 Is the contact chamber free of growth,or sludge buildup? M ❑ ❑ ❑ Is there chlorine residual prior to de-chlorinat=on? ❑ ❑ ❑ M Page# 8 Permit: NCO020389 Owner-Facility: Ben-acn WWTP Inspection Date: 02117,2020 Inspection Type. [>mpl:ance EvaleaGon Disinfection-Liquid Yes No NA NE Comment: Per the ORC, the plant has changed from using gas to liquid sodium hypochlorite after discussing the change with Central Office staff. Waterguard is scheduled to supply material every,two weeks. The facility keeps a powder mix as a back-up. Estimated contact time in the chamber is 30 minutes. De-chlorination Yes No NA NE Type of system 7 Liquid Is the feed ratio proportional to chlorine amount(1 to 1)? 0 ❑ ❑ ❑ Is storage appropriate for cylinders? 0 ❑ ❑ ❑ #is de-chlorination substance stored away from chlorine containers? 0 ❑ ❑ ❑ Are the tablets the proper size and type? 110 0 ❑ Comment: Calcium thiosulfate is added and the effluent is post aerated-by units from the bottom of the chamber. Waterguard also supplies this material. Are tablet de-chlorinators operational? ❑ ❑ 0 ❑ Number of tubes in use? 0 Comment: Flow Measurement - Effluent Yes No NA NE #Is flow meter used for reporting? M ❑ ❑ ❑ Is flow meter calibrated annually? M ❑ ❑ ❑ Is the flow meter operational? 0 ❑ ❑ ❑ (If units are separated)Does the chart recorder match the flow meter? ❑ ❑ ❑ Comment: The effluent flow meter is used for reporting and was last calibrated 8-30-2019 b Clearwater. The meter display showed 1.88 MGD at approximately 11:40 AM. Effluent Pipe Yes No NA NE 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? ❑ ❑ 0 ❑ Comment: Outfall appears to have a "Y-s lit"and discharges from two separate outlets in the same location. Staff is requested to veriy and describe location of split. Effluent Sampling Yes No NA NE Is composite sampling flow proportional? M ❑ ❑ ❑ Is sample collected below all treatment units? M ❑ ❑ ❑ Is proper volume collected? ❑ ❑ ❑ Page# .9 Permit: NCO020389 Owner-Facility: Benson W WTP Inspection Date: 02/1712020 Inspection Type: Compliance Evaluation Effluent Sampling Yes No NA NE Is the tubing clean? 0 ❑ ❑ ❑ #Is proper temperature set for sample storage(kept at less than or equal to 6.0 degrees a ❑ ❑ ❑ Celsius)? Is the facility sampling performed as required by the permit((requency,sampling type M ❑ ❑ ❑ representative)? Comment: The sampler temperature was noted as 3.0 degrees Celsius. The revious inspection noted that samples were being collected at a rate that did not meek permit requirements. The sampler is now set to collect 120 mL samples and is flow_proportional. 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? 0 ❑ ❑ ❑ Was generator tested&operational during the inspection? ❑ 0 ❑ ❑ Do the generator(s)have adequate capacity to operate the entire wastewater site? M ❑ ❑ ❑ Is there an emergency agreement with a fuel vendor for extended run on back-up power? ❑ 0 ❑ ❑ Is the generator fuel level monitored? M ❑ ❑ ❑ Comment: The generator on site is equipped to provide power for the entire plant. The unit is manually tested. The ORC stated that it has been several months since a test was last performed._ DWR staff recommended testing tau to-testin q the generator on a regular basis and periodically under load (with appropriate documentation)to ensure that it will function properly when necessary. Pages 10