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Home My WebLink AboutNC0043176_Inspection_20060302• Michael F. Easley, Governor William G. Ross Ir., Secretary North Carolina Department of Environment and Natural Resources Alan W. Klimek, P.E., Director Division of Water Quality March 2; 2006 Ronald D. Autry City of Dunn PO Box 1065 Dunn, NC 28335 SUBJECT: February 21, 2006 Compliance Evaluation Inspection City of Dunn Dunn WWTP Permit No: NC0043176 Harnett County. Dear Mr. Autry: Enclosed please find a copy of the Compliance Evaluation Inspection Report from the inspection conducted on February 2.1, 2006. The time and assistance given by Mr. Bobby Burnette, ORC, and Ms. "Donrie Dukes, Laboratory Supervisor, is greatly appreciated. Mark Brantley, Trent Allen and myself conducted a follow-up visit on March 1, 2006 to confirm that the„effluent sampler is set up on a flow proportional basis. Ms. Dukes was also present and again I would like to extend my gratitude for her time and assistance. The facility was found to be in Compliance with permit NC0043176. Please refer to the enclosed inspection report for additional observations and comments. If you or your staff has any questions, please call me at 910-486-1541, ext. 729. Sincerely, Michael Lawyer Environmental Technician cc: Bobby Burnette, ORC Donrie Dukes, Laboratory Supervisor Central Files NorthCarolina naturally North Carolina Division of Water Quality 225 Green Street, Suite 714 Fayetteville, NC 28301-5043 Phone (910) 486,1541 Customer Service Fax (910) 486-0707 ,1-877-623-6748 , Internet: www.ncwatercinalitv.orti An Equal Opportunity/Affirmative Action Employer-50% Recycled/10% Post Consumer Paper NPDES yr/mo/day Inspection Type 3I NC0043176 111 121 06/02/21 1 17 181A (cont.) 1 Section D: Summary of Finding/Comments (Attach additional sheets of. narrative and checklists as necessary) Inspection was conducted with the assistance of Mr. Bobby Burnette, ORC, and Ms. Donrie Dukes, Lab Supervisor. A copy of the current NPDES permit was presented, upon request and Discharge Monitoring Reports from January, April and September 2005 were reviewed for accuracy and completeness. While no permit limits were exceeded for the respective months, the monthly average for various parameters that included results of less than detection limits were calculated incorrectly. The correct method for calculating averages with results of zerowas discussed with Mr. Burnette and Ms. Dukes. Following the records review, a tour of the facility was conducted. All treatment units at the time of inspection appeared to be in good working order. Upon inspecting the building which houses the chlorine gas and sulfur dioxide gas used for chlorination and dechiorination respectively, it was noticed that cylinders for both gases are routinely kept side by side with no separation. This practice poses a potentially dangerous situation and as suggested in many previous inspection reports should be reconsidered. Sludge in the aerobic digestor had recently been pumped into the facility's sludge holding tank where it will subsequently be removed and land applied. Page # 2 Permit: NC0043176 Owner - Facility: Dunn WVVrP Inspection Date: 02/21/2006 Inspection Type: Compliance Evaluation Record Keeping Yes No NA NE (If the facility is = or > 5MGD permitted flow) Do they operate 24/7 with a certified operator on each shift? n n ■ n Is the ORC visitation log available and current? ■ n n ❑ Is the ORC certifiedat grade equal to or higher than the facility classification? ■- n n n Is the backup operator certified at one grade lessor greater than the facility classification? ■ n n n Is a copy of the current NPDES permit available on site? ■ n n n Facility has copy of previous year's Annual Report on file for review? n n n ■ Comment: Operations & Maintenance Yes . No NA NE Is the plant generally clean with acceptable housekeeping? '■ n n n Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable Solids, pH, DO, Sludge • ❑ n n Judge, and other that are applicable? Comment: Standby Power Is automatically activated standby power available? ■ n n n Is the generator tested by interrupting primary power source? ■ n n n Is the generator tested under load? ■ n n n Was generator tested & operational during the inspection? = n n n ■ Do the generator(s) have•adequate capacity to operate the entire wastewater site? ■ n n n Is there an emergency agreement with a fuel vendor for extended run on back-up power? n n n ■ Is the generator fuel level monitored? ■ n n n Comment: On -site generator performs a self -test every Monday and runs for approximately 1 hour. The fuel tank holds approximately 1500 gallons and is checked on a regular basis. If the fuel level drops to 1000 gallons, it is filled up. Pump Station - Influent Yes No NA NE Is the pump -wet well free of bypass lines or structures? n n n ■ Is the wet well free of excessive grease? n ❑ ❑ ■ Are all pumps present? ■ n n n Are all pumps operable? ■ n n n Are float controls operable? n n ■ n Is SCADA telemetry available and operational? n n ■ n Is audible and visual alarm available and operational? ■ n n n Yes -No NA NE Page # 4 Permit: NC0043176 Inspection Date: 02/21/2006 Owner - Facility: Dunn w1MP Inspection Type: Compliance Evaluation Flow Measurement - Influent Is the flow meter operational? (If units are separated) Does the chart recorder match the flow meter? Comment: Flow meter was last calibrated in April 2005. Aeration Basins Mode of operation Type of aeration system Is the basin free of dead spots? Are surface aerators and mixers operational? Are the diffusers operational? Is the foam the proper color for the treatment process? Does the foam cover less than 25% of the basin's surface? Is the DO level acceptable? Is the DO level acceptable?(1.0 to 3.0 mg/I) Comment: According to the ORC, DO levels typically fall between 0.5-2.5 mg/L. Aerobic Digester 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: At the time of inspection, the sludge had been pumped out of the digestor and into the holding tank. Secondary 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? Is the site free of excessive floating sludge? Yes No NA NE ■ nnn n nn■ Yes No NA NE Ext. Air Diffused ■ nnn nn■n ■ nnn ■ nnn ■ nnn ■ nnn ■ nnn Yes No NA NE ■ nnn -nn.n■ n nn■ n nn■ ■ nnn Yes No NA NE' 1nnn ■ nnn ■ nnn ■ nnn ■ nnn ■ nnn ■ nnn Page # Permit: NC0043176 Owner - Facility: Dunn WWTP Inspection Date: 02/21/2006 Inspection Type: Compliance Evaluation Flow Measurement - Effluent (If units are separated) Does the chart recorder match the flow meter? Comment: Flow meter was last calibrated in October 2005. Effluent Sampling Is composite sampling flow proportional? Is sample collected below all treatment units? Is proper volume collected? Is the tubing clean? Is proper temperature set for sample storage (kept at 1.0 to 4.4 degrees Celsius)? Is the facility sampling performed as required by the permit (frequency, sampling type representative)? Comment: Pump Station - Effluent Is the pump wet well free of bypass lines or structures? Are all pumps present? Are all pumps operable? Are float controls operable? Is SCADA telemetry available and operational? h1 . Is audible and visual alarm available and operational? Comment: The pumps,are controlled by a dopier system. Yes No NA NE ■ nnn Yes No NA NE ■ nnn ■ nnn ■ nnn ■ nnn ■ 000 ■ nnn Yes No NA NE ■ nnn ■ nnn ■ .nnn n n■n n n■n n nn■ Page # 8