ࡱ> VXU7 (bjbjUU VL7|7|$l l$zzzPdk72N^ttt   0 0 0 0KT0L3L6$8 :7    7tt%7 tt0 0j#,|^.tB @I:d zp-.;70k71-;3;.CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD  ADVANCE \d 5 INSPECTION REPORT 21 November 2002 DISCHARGER: City of Auburn LOCATION & COUNTY: Auburn Wastewater Treatment Plant, Auburn, Placer County CONTACT(S): Jim KingProject Manager OMI, Inc./Auburn Daniel BurnsOperator (Grade III) OMI, Inc./Auburn Thomas FossumPublic Works Director/City Engineer INSPECTION DATE: 20 November 2002 INSPECTED BY: Melissa Hall, WRCE ACCOMPANIED BY: Daniel Burns (Auburn WWTP Plant Operator), Richard McHenry (Regional Board staff) Mark Tavianini (California Air Resources Board staff) INTRODUCTION: The City of Auburn owns the Auburn Wastewater Treatment Plant, which is operated by Operations Management International, Incorporated (OMI). The treatment system at this plant consists of treatment and equalization ponds, an oxidation ditch, secondary clarification, coagulation and flocculation, filtration, disinfection, and removal of disinfectant. Treated wastewater is discharged into Auburn Ravine, a tributary to the Sacramento River. Sludge is dewatered with a belt filter press and removed to the Lincoln Landfill. An inspection of this facility was conducted to determine compliance with Waste Discharge Requirements (WDRs), Order No. 98-189 (NPDES No. CA0077712), and with the State of California General Permit for Storm Water Discharges Associated with Industrial Activities (industrial stormwater permit), Order No. 97-03-DWQ (WDID# 5S31S002989). The inspection included a tour of the facilities; a review of the treatment processes; sampling for influent, effluent, and receiving water constituents and parameters as required by Monitoring and Reporting Program No. 98-189; review of discharger self-monitoring reports (DSMRs) submitted for the months of June 2002 through October 2002; and review of the Storm Water Pollution Prevention Plan (SWPPP). OBSERVATIONS AND COMMENTS: Regional Board staff, accompanied by Mr. Mark Tavianini (California Air Resources Board staff), arrived at the Auburn WWTP at 8:05 a.m. The plant was last inspected on 20June 2002. The plant appeared to be clean, well-maintained, and in good operating condition. The weather was mild and clear. The mechanically cleaned bar screen was in service at the time of the inspection; the manually cleaned bar screen was not being used at the time. A portion of the influent wastewater (0.27 mgd at 8:25 a.m.) was being routed through Pond 1A during the inspection for flow equalization. Aeration in Pond 1A is provided by surface aerators. The first baffled section of the aerated pond has nine aerators, four of which were in use during the inspection. The second, third, and fourth (final) baffled sections of the aerated pond each have one surface aerator; the aerators in the second and fourth sections were in use. Pond 1A has a concrete lining along the sides of the pond and a clay-lined bottom. The remainder of the influent flow (0.676 mgd at 8:25 a.m.) was being directed to the oxidation ditch. The influent compositer was appropriately cool, with the compositer thermometer reading 3.5 C. Following biological treatment in the oxidation ditch, flows are directed to one of two secondary clarifiers. Secondary effluent appeared to be of high quality. After clarification, wastewater is flash-mixed with poly aluminum chloride prior to flowing through a small mixing chamber and through one of the continuous backwash sand filter cells. The #5 and #6 cells were on-line during the inspection. Mr. Burns noted that aeration of the flow diversion tank for the filters had significantly reduced the maintenance required for scum removal in this area. After filtration, the treated wastewater was directed to one of the two chlorine contact chambers. A 12.5% solution of sodium hypochlorite is being used for disinfection, and calcium thiosulfate is being used for dechlorination. Use of calcium thiosulfate means chemical adjustment of pH is unnecessary. A silicone-based, food-grade defoaming agent is also added. Although, no aquatic life was observed, receiving water monitoring points upstream and downstream of the plant appeared to be healthy, with low turbidity and temperatures and high concentrations of dissolved oxygen. Flows in Auburn Ravine near the point of discharge have been relatively low since 14October2002. Stormwater This inspection included a cursory review of compliance with the general industrial stormwater permit. No non-stormwater discharges other than those permitted by the individual NPDES permit were observed. The SWPPP was available for review at the time of the inspection, in accordance with Section A.2 of the general industrial stormwater permit, and appeared to be complete. Sampling Sampling of the treatment plant influent, effluent, and receiving waters was conducted during the inspection. Constituents and parameters for which sampling was conducted include the following: Influent 5-day, 20C biochemical oxygen demand (BOD); total suspended solids (TSS); flow Effluent BOD, TSS, settleable solids (SS), total dissolved solids (TDS), temperature, ammonia, turbidity, total coliform organisms, standard minerals, oil and grease, MBAS R-1 and R-2 dissolved oxygen (DO), temperature, fecal coliform organisms, turbidity, chlorine residual R-1: 50 feet upstream from the point of discharge R-2: 100 feet downstream from the point of discharge Tests for dissolved oxygen, temperature, and chlorine residual were performed on-site by Board staff using portable meters. Flows were read from meters at the treatment plant. The oil and grease analysis is being performed by California Laboratory Services in Rancho Cordova. Analyses for the remaining constituents are being performed by Sierra Foothill Laboratory in Jackson. All samples were grab samples. Laboratory Audit The laboratory at the treatment plant is currently certified by the California Department of Health Services Environmental Laboratory Accreditation Program (ELAP) for the following analyses: Coliform organisms (multiple tube method)BODTSSAquatic toxicity bioassay with rainbow troutAmmoniaTDSTotal chlorine residualTurbiditySSSpecific conductivity The certification number for the laboratory is 2038. Certification was renewed 1 December 2000 and expires 31 December 2002. The laboratory audit included a comparison of a recent DSMR (August 2002) to laboratory records. The comparison revealed that the laboratory has been conducting duplicate analyses for BOD and TSS for quality assurance/quality control. The results of these analyses have not been shown in the DSMRs. The third paragraph of the Reporting section in Monitoring and Reporting Program No.98189 reads as follows: If the Discharger monitors any pollutant at the locations designated herein more frequently than is required by this Order, the results of such monitoring shall be included in the calculation and reporting of the values required in the discharge monitoring report form. Such increased frequency shall be indicated on the discharge monitoring report form. Future DSMRs must be modified to include these results. Results of Sampling Analyses Results from the laboratory analyses have not yet been received. Portable meter analytical laboratory results are shown in the following table: EffluentR-1R-2Temperature (F, C)62.6,17.050.0,10.054.5,12.5Dissolved oxygen (mg/l)9.310.7511.14 (% saturation)--107.6104.8Chlorine (mg/l)--<0.1<0.1 In addition, the plant meters for turbidity read 1.391 NTU coming out of the filters and 1.901 NTU for final effluent at 11:22 a.m. and the plant meter for effluent calcium thiosulfate residual read 1.75 mg/l at 11:25 a.m. on the day of the inspection. All meter/kit results for the effluent were within permit limitations. Review of Discharger Self-Monitoring Reports A review of the monthly DSMRs for the months of June 2002 through October 2002 was conducted prior to this inspection. The following violation was noted: As reported by the Discharger in the October 2002 DSMR and in separate verbal and written reports, the Auburn WWTP effluent exceeded the daily maximum total coliform organisms limitation of 23 MPN/100 ml on 30 October 2002. According to the report, Discharger operations staff believe the high result to be have been caused by a faulty sampling procedure. The duplicate sample result was 2MPN/100 ml. Previous inspection reports discussed the need for a summary of receiving water condition notes as required by Monitoring and Reporting Program No.98189. The October 2002 DSMR included the check sheet for the receiving stream used by the Discharger. SUMMARY: A SWPPP was readily available for review by Regional Board staff at the facility. The SWPPP appeared to be complete and facility employees are trained for stormwater. This facility appears to be in compliance with the general industrial stormwater permit. 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