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CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD INSPECTION REPORT 6 November 2003 DISCHARGER: San Joaquin County Service Area 31 LOCATION & COUNTY: Flag City Wastewater Treatment Plant, San Joaquin County CONTACT(S): Ron Rall, Daniel Mullins, Ben Guzman INSPECTION DATE: 14 October 2003 INSPECTED BY: George Lockwood ACCOMPANIED BY: Ron Rall, Daniel Mullins, Ben Guzman OBSERVATIONS AND COMMENTS: Pre Inspection and Arrival: Prior arrangements were made with Ron Rall to inspect the Flag City Wastewater Treatment Plant on 14 October 2003, at 1200. The facility is regulated by Waste Discharge Requirements (WDRs) Order No. R5 2003-0061, NPDES No. CA0082848, and Cease and Desist Order No. R5-2003-0062 for a surface water discharge to Highline Canal. Prior to the inspection, the May, June, and July Discharger self-Monitoring Reports were reviewed. Upon arrival at 1200, the inspection started with the treatment plant grounds (see photo log Attachment A). After the treatment plant inspection was completed, a review of the June monitoring report was conducted with plant staff. The inspection concluded at the discharge outfall. The sky was clear the, sun was shining, air temperature was warm, and a slight breeze was observed. The plant treatment train consists of headworks, primary tank, secondary aeration reactor w/overflow basin, s6condary/final clarifier, aerated sludge digester, sludge dewateing unit/w drying area, chlorine contact tank, effluent holding tank/w dechlorination, outfall to Highline Canal, and/or disposal pond. Dried sludge is taken to the local landfill for disposal. Denitrification for the wastewater is achieved at the plant by periodically halting the flow of air to the aerobic processes. This allows for anaerobic nitrogen conversion so that the plant can comply with WDRs. This plant does not have a state certified laboratory for sample analysis. Much of the process control sampling is performed by staff with hand held devices or other methods that can be completed in a limited service laboratory. Presently domestic wastewater is receivedfrom the Flag City commercial development at Highway 12 and Interstate Freeway 5. The commercial development consists largely of service stations and fast food restaurants. There are 29 connections and only 15 are currently active. Flow averaged about 50,000 gallons per day (gpd), influent BOD was about 600 mg/l, and TSS was about 400 for the month of June. These influent parameter can and do fluctuate from month to month. The plant design average dry weather flow is 160,000 gpd.