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Home My WebLink AboutNC0047384_Compliance Evaluation Inspection_20170203XIA February 3, 2017 Mr. Steven Drew, Director Water Resources Department City of Greensboro P.O. Box 3136 Greensboro, NC 27402-3136 SUBJECT: Compliance Evaluation Inspection City of Greensboro - T.Z. Osborne WWTP NPDES Permit No. NCO047384 Guilford County Dear Mr. Drew: ROY COOPER Governor MICHAEL S. REGAN Secretary S. JAY ZIMMERMAN Director RECEIVEDINMCDEQ019R 'FEB 4 2017 VVatet Quality perr^tttAng Section On January 26, 2017, Min Xiao and Ron Boone of this office met with Mr. Elijah Williams, Mr. Bradley Flynt, Mr. Lawrence O'Neal, Ms. Martie Groome and Ms. Alicia Goots to perform a Compliance Evaluation Inspection of the NPDES wastewater discharge from the T.Z. Osborne facility (TZO). The inspection findings are detailed below and an inspection checklist is attached. I. Permit The NPDES was reissued on July 1, 2014. TZO is currently being upgraded to 56.0 MGD to accommodate flow from the planned North Buffalo decommissioning and to meet the proposed total nitrogen limits. H. Self -Monitoring Program The monthly Discharge Monitoring Reports (DMRs) were reviewed for the,period November 2015 through October 2016. The facility was only found to be non-compliant with the effluent limits for weekly average NH3-N in the weeks of April 9r'' and April 30`i' in 2016. In regards to the permit monitoring requirements, it was noted that all sampling was performed per the frequencies specified in the permit. M. Flow Measurement An ultrasonic meter with parshall flume is used to report effluent flow on the DMRs. The meter is calibrated once per year. It was last calibrated on March 15, 2016 by city staff. In addition, flow proportional composite samples are collected of the effluent as required by the permit. IV. Sludge Handling and Disposal Solids handling consists of two sludge receiving tanks, four gravity thickeners, three centrifuges, thickened sludge holding tanks and two fluidized bed incinerators. Incinerator ash is taken to the landfill. Solids from the North Buffalo facility are also handled at TZO. V. Operations and Maintenance This inspection indicated that the operation and maintenance of TZO WWTP was performed excellently by operators and laboratory staff. The lab was also observed to be clean and organized. State of North Carolina I Environmental Quality 450 W. Hanes Mill Road, Suite 300, Winston-Salem, North Carolina 27105 Phone: 336-776-98001 FAX: 336-776-9797 Page 2 VI. Facility Site Review Please see the attached inspection checklist for specific comments on the system components. It was noted that the construction is continuing in order to upgrade the facility from 40 MGD to 56 MGD. The construction is expected to be completed by 2020. VII. Records/Reports All required information was readily available, complete, and current. A comparison of the February 2016 DMR with the laboratory records for pH, dissolved oxygen, CBOD, total phosphorus and selenium revealed that these parameters were accurately transcribed onto the monitoring report. In addition, the 2015 Annual Performance Report was available for review. VIII. Effluent/Receivin Waters The system discharges into South Buffalo Creek, class "WS -V; NSW" waters in the Cape Fear River Basin. The effluent was clear on the day of inspection. Should you have any questions concerning this report, please contact Min Xiao or me at (336) 776-9800. Sincerely, 17`/Sherri V. Knight, PE Regional Supervisor Water Quality Regional Operations Section Division of Water Resources cc: Elijah Williams (elijah.williams@greensboro-nc.gov) Bradley Flynt (bradley.flynt@greensboro-nc.gov) Martie Groome (martie.groome@greensboro-nc.gov) Central Files NPDES Unit WSRO United States Environmental Protection Agency Form Approved. EPA Washington, D.C. 20460 OMB No. 2040-0057 Water Compliance Inspection Report Approval expires 8-31-98 Section A: National Data System Coding (i.e., PCS) Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type 1 I,, 1 2 15 I 3 I NC0047384 I11 12 17/01/26 17 18 L_ i 19 L G 201 2111.11 I I I I I III I I I I I I I I I I I I I I I I I I I I I I III I I I I 1166 Inspection Work Days Facility Self -Monitoring Evaluation Rating B1 - QA -----------Reserved------- I 71 I I 72 L N J 731 I 174 75III 67 70 Iu it L J I I I 80 Section B: Facility Data 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:OOAM 17/01/26 14/07/01 T.Z. Osborne WWTP 2350 Huffine Mill Rd Exit Time/Date Permit Expiration Date Mc Leansville NC 27301 12:45PM 17/01/26 19/06/30 Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s) Other Facility Data Bradley Todd Flynt/ORC/336-433-7262/ Name, Address of Responsible Official/Title/Phone and Fax Number Contacted Steven Drew,PO Box 3136 Greensboro NC 274023136//336-373-2055/3364126305 No Section C: Areas Evaluated During Inspection (Check only those areas evaluated) Permit Flow Measurement ® Operations & Maintenance Records/Reports Self -Monitoring Program Sludge Handling Disposal Facility Site Review Effluent/Receiving Waters 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 Ron Boone WSRO WQH336-776-9690/f/ � Min Xiao _ WSRO WQ//336769800/ Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Signature Date 1,711 EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete. Page# NPDES yr/mo/day Inspection Type 31 NCO047384 I� � 121 17/01/26 17 18 I Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) Page# Jj S Permit: NCO047384 Owner - Facility: T.Z. Osborne WWTP Inspection Date: 01/26/2017 Inspection Type: Compliance Evaluation Permit Yes No NA NE (If the present permit Iexpires in 6 months or less). Has the permittee submitted a new. ❑ ❑ 0 ❑ application? 0 ❑ ❑ ❑ Is the facility as described in the permit? 0 ❑ ❑ ❑ # Are there any special conditions for the permit? M ❑ ❑ ❑ Is access to the plant site restricted to the general public? M ❑ ❑ ❑ Is the inspector granted access to all areas for inspection? M ❑ ❑ ❑ Comment: T.Z. Osborne WWTP is now in the process of upgrading from 40 MGD to 56 MGD. Around July 2017 the staff will conduct a pilot test of taking more wastewater from North Buffalo Creek WWTP to ensure the effluent limits will still be in compliance with the permit. All the construction is expected to be completed by 2020. Operations & Maintenance Yes No NA NE Is the plant generally clean with acceptable housekeeping? M ❑ ❑ ❑ Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable M ❑. ❑ ❑ Solids, pH, DO, Sludge Judge, and other that are applicable? Comment: _ Record Keeping 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 (lab. reg. required 5 years)? M ❑ ❑ ❑ Are analytical results consistent with data reported on DMRs? M ❑ ❑ ❑ Is the chain -of -custody complete? 0 ❑ ❑ ❑ Dates, times and location of sampling ❑ ❑ (If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified operator 0 Name of individual performing the sampling ❑ . on each shift? Results of analysis and calibration Dates of analysis Name of person performing analyses Transported CDCs 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 operator 0 ❑ ❑ ❑ on each shift? Is the ORC visitation log available and current? M ❑ ❑ ❑ Is the ORC certified at grade equal to or higher than the facility classification? M ❑ ❑ ❑ Page# 3 W Permit: NCO047384 Owner - Facility: T.Z. Osborne WwrP Yes No NA NE Is the pump wet well free of bypass lines or structures? 0 ❑ Inspection Date: 01/26/2017 Inspection Type: Compliance Evaluation ❑ Is the wet well free of excessive grease? 0 ❑ Record Keeping Yes No NA NE Is the backup operator certified at one grade less or greater than the facility classification? M ❑ ❑ ❑ Is a copy of the current NPDES permit available on site? M ❑ ❑ ❑ Facility has copy of previous year's Annual Report on file for review? ■ ❑ ❑ ❑ Comment: A comparison of the February 2016 DMR with the laboratory records for PH dissolved oxygen, CBOD, total phosphorus and selenium revealed that these parameters were accurately transcribed onto the monitoring report. The 2015 Annual Performance Report was prepared and also available online and in local library. Pump Station - Influent Yes No NA NE Is the pump wet well free of bypass lines or structures? 0 ❑ ❑ ❑ Is the wet well free of excessive grease? 0 ❑ ❑ ❑ Are all pumps present? M ❑ ❑ ❑ Are all pumps operable? ❑ M ❑ ❑ Are float controls operable? M ❑ ❑ ❑ Is SCADA telemetry available and operational? M ❑ ❑ ❑ Is audible and visual alarm available and operational? M ❑ ❑ ❑ Comment: There are 4 pumps in total. Only two of the pumps were operating during the inspection. For another two pumps, one was out of service and the other one was being rebuilt. 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? ■ ❑ ❑ ❑ Is disposal of screening in compliance? ❑ ❑ ❑ Is the unit in good condition? ® ❑ ❑ ❑ Comment: The bar screens are 36 feet Ion Grit. Removal Yes No NA NE Type of grit removal a.Manual ❑ b. Mechan ical Is the grit free of excessive organic matter? M ❑ ❑ ❑ Is. the grit free of excessive odor? 0 ❑ ❑ ❑ Page# 4 :. Permit: NC0047384 Owner - Facility: T.Z. Osborne WWrP Inspection Date: 01/26/2017 Inspection Type: Compliance Evaluation Grit Removal Yes No NA NE # Is disposal of grit in compliance? N ❑ ❑ ❑ Comment: Primary Clarifier Yes No NA NE Is the clarifier free of black and odorous wastewater? 0 ❑ ❑ ❑ Is the site free of excessive buildup of solids in center well of circular clarifier? N ❑ ❑ '❑ Are weirs level? N ❑ ❑ ❑ Is the site free of weir blockage? 0 ❑ ❑ ❑ is the site free of evidence of short-circuiting? E ❑ ❑ ❑ Is scum removal adequate? 0 ❑ ❑ ❑ Is the site free of excessive floating sludge? E ❑ ❑ ❑ Is the drive unit operational? ■ ❑ ❑ ❑ Is the sludge blanket level acceptable? E ❑ ❑ ❑ Is the sludge blanket level acceptable? (Approximately %4 of the sidewall depth) N ❑ ❑ ❑ Comment: There are 6 primary clarifiers (2 circular and 4 rectangular). Equalization Basins Yes No NA NE Is the basin aerated? ❑ ❑ ❑ 0 Is the basin free of bypass lines or structures to the ,natural environment? N ❑ ❑ ❑ Is the basin free of excessive grease? E ❑ ❑ ❑ Are all pumps present? 0 ❑ ❑ 0 Are all pumps operable? ❑ ❑ ❑ E Are float controls operable? ❑ ❑ ❑ Are audible and visual alarms, operable? ❑ ❑ ❑ E # Is basin size/volume adequate? E ❑ ❑ ❑ Comment: The old 3.5 MG EQ basin and a new 4.5 MG EQ basin were in use. Aeration Basins Yes No NA NE Mode of operation Ext. Air Type of aeration system Diffused Is the basin free of dead spots? 0 ❑ ❑ ❑ Are surface aerators and mixers operational? 0 ❑ ❑ ❑ Are the diffusers operational?' 0 ❑ ❑ ❑ Page# 5 Permit: N00047384 Owner - Facility: T.Z. Osborne WWTP Is the clarifier free of black and odorous wastewater? 0 ❑ Inspection Date: 01/26/2017 ' Inspection Type: Compliance Evaluation Is the site free of excessive buildup of solids in center well of circular clarifier? e ❑ Aeration Basins Yes No NA NE Is the foam the proper color for the treatment process? ® ❑ ❑ ❑ Does the foam cover less than 25% of the basin's surface? e ❑ ❑ ❑ Is the DO level acceptable? 0 ❑ ❑ ❑ Is the DO level acceptable?(1.0 to 3.0 mg/1) 0 ❑ ❑ ❑ Comment: , There are 12 aeration basins in total. Only 11 of them were being used during the inspection. The DO level observed was 2.58 mg/I. 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? e ❑ ❑ ❑ Are weirs level? ® ❑ ❑ ❑ Is the site free of weir blockage? e ❑ ❑ ❑ Is the site free of evidence of short-circuiting? 0 ❑ ❑ ❑ Is scum removal adequate? 0 ❑ ❑ ❑ Is the site free of excessive floating sludge? 0 ❑ ❑ '❑ Is the drive unit operational? ❑ ❑ ❑ Is the return rate acceptable (low turbulence)? N ❑ ❑ ❑ Is the overflow clear of excessive solids/pin floc? M ❑ ❑ ❑ Is the sludge blanket level acceptable? (Approximately %< of the sidewall depth) N ❑ ❑ ❑ Comment: Seven secondary clarifiers with covered weir troughs to control algea (5 in use now, 2 under construction). Another 3 new secondary clarifiers are being built. Filtration (High Rate Tertiary) Type of operation: Is the filter media present? Is the filter surface free of clogging? Is the filter free of growth? Is the air scour operational? Is the scouring acceptable? Is the clear well free of excessive solids and filter media? Yes No NA NE N ❑ ❑ ❑ ■ ❑ ❑ ❑ ❑ ❑ ❑ ■ ❑ ❑ ■ ❑ ❑ ❑ N ❑ ❑ ❑ N ❑ Comment: The sand filters are no longer in use since the beginning of 2017. Instead. six AguaDiamond@ Cloth Media Filters were completed construction (3 in use now). This new filtration system is more cost-efficient. Disinfection -Liquid Yes No NA NE Page# 6 Permit: NCO047384 Owner -Facility: T.Z.OsborneWWTP Yes No NA NE Type of system ? Liquid ❑ Inspection Date: 01/26/2017 Inspection Type: Compliance Evaluation ❑ Is the feed ratio proportional to chlorine amount (1 to 1)? ❑ 0 Disinfection -Liquid Yes No NA NE Is there adequate reserve supply of disinfectant? ❑ ❑ ❑ ❑ (Sodium Hypochlorite) Is pump feed system operational? 0 ❑ ❑ ❑ Is bulk storage tank containment area adequate? (free of leaks/open drains) 0 ❑ ❑ ❑ Is the level of chlorine residual acceptable? M ❑ ❑ ❑ Is the contact chamber free of growth, or sludge buildup? 0 ❑ ❑ ❑ Is there chlorine residual prior to de -chlorination? E ❑ ❑ ❑ Comment: Two more contact chambers are being constructed (four contact chambers existed). De -chlorination Yes No NA NE Type of system ? Liquid ❑ ❑ ❑ Is the feed ratio proportional to chlorine amount (1 to 1)? ❑ 0 ❑ ❑ Is storage appropriate for cylinders? ❑ ❑ M ❑ # Is de -chlorination substance stored away from chlorine containers? ❑ ❑ ❑ M Are the tablets the proper size and type? ❑ ❑ M ❑ Comment: The feed ratio of sodium bisulfite to chlorine amount was approximately 6 to 15. Page# 7 Are tablet de -chlorinators operational? ❑ ❑ 0 ❑ Number of tubes in use? Comment: Flow Measurement - Effluent Yes No NA NE # Is flow meter used for reporting? 0 ❑ ❑ ❑ Is flow meter calibrated annually? M ❑ ❑ ❑ Is the flow meter operational? 0 ❑ ❑ ❑ (If units are separated) Does the chart recorder match the flow meter? ❑ ❑ 0 0 Comment: The meter was calibrated once per year. It was last calibrated on March 15, 2016 by city staff. Page# 7 Effluent Sampling Yes No NA NE Is composite sampling flow proportional? . 0 ❑ ❑ ❑ Is sample collected below all treatment units? M ❑ ❑ ❑ Is proper volume collected? 0 ❑ ❑ ❑ Is the tubing clean? M ❑ ❑ ❑ # Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees M ❑ ❑ El Celsius)? Page# 7 Permit: NCO047384 Owner -Facility: T.Z. OsborneWWTP Inspection Date: 01/26/2017 Inspection Type: Compliance Evaluation Effluent Sampling Yes No NA NE Is the facility sampling performed as required by the permit (frequency, sampling type 0 ❑ ❑ ❑ representative)? Comment: The refrigeration temperature was 3.17 Celcius degrees. Effluent Pipe Yes No NA NE Is right of way to the outfall properly maintained? M ❑ ❑ ❑ Are the receiving water free of foam other than trace amounts and other debris? 0 ❑ ❑ ❑ If effluent (diffuser pipes. are required) are they operating properly? N ❑ ❑ ❑ Comment: The system discharges into South Buffalo Creek, class "WS -V; NSW waters in the Cape 0 ❑ Fear River Basin. The effluent was clear on the day of inspection. ❑ Is the site free of sludge buildup on belts and/or rollers of filter press? M ❑ Solids Handling Equipment Yes No NA NE Is the equipment operational? 0 ❑ ❑ ❑ Is the chemical feed equipment operational? N ❑ ❑ ❑ Is storage adequate? 0 ❑ ❑ ❑ Is the site free of high level of solids in filtrate from filter presses or vacuum filters? 0 ❑ ❑ ❑ 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? N ❑ ❑ ❑ The facility has an approved sludge management plan? 0 ❑ ❑ ❑ Comment: After belt filter press (solid content around 25 to 30 %), the sludge will be sent to the incinerators. Incinerator ash is taken to the landfill. The solids from North Buffalo are pumped to TZO for handling. Page# 8