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CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD INSPECTI=REPORT 18 August 2003 DISCHARGER: City of Stockton LOCATION & COUNTY: Stockton-RWCF, San Joaquin County CONTACT(S): Mark Madison and Steve Gittings INSPECTION DATE: 25 June 2003 - INSPECTED BY: George Lockwood ACCOMPANIED BY: David Thornburgh, Ava Langston-Kenney, Dennis Burrell OBSERVATIONS AND COMMENTS: Pre Inspection and Arrival: Prior arrangements were made with Steve Gittings to inspect the City of Stockton—Regional Wastewater Control Facility(RWCF) on 25 June 2003 at 0800. The RWCF is regulated by Waste Discharge Requirements (WDRs) Order No. R5 2002-0083, NPDES No. CA0079138. and Cease and Desist Order No. R5-2002-0084. Prior to the inspection, the January, February, and April Discharger self-monitoring reports were reviewed. The inspection started upon arrival at the RWCF location at 0727 on 25 June 2003 (for location see Attachment A). Sky was clear the, sun was shining, and a slight breeze was observed. While turning into the RWCF parking lot driveway from Navy Drive, odors were observed immediately from within the vehicle with windows rolled up and air-conditioning in operation. At the entrance to the administration building, an accumulation of flies was observed resting on the ceiling. A short meeting was held with Steve Gittings and David Thornburgh prior to the RWCF inspection. Lab certification was requested and a copy received (see Attachment B). Notice, the lab certification expiration date is 31 May 2003. The certification had expired 26 days earlier and no new certification had been issued. According to Larry Huber lab director, due to lack of action on the part of DHS a new certification had not been issued. Subsequently the City of Stockton has sent(via fax on 1 July 2003) a copy of a conditional certification from DHS dated 1 May 2003. Sample Collection: A 24-hour composite sample was collected from the sampler in the presence of Mr. Thornburgh. The sample data results measured were within the discharge limitations specified in the NPDES permit (see sample results Attachment C). A composite sample was collected for CBOD, TSS, and NH3 and a grab sample was collected for total coliform. Physical collection of the samples was completed by David Callous, a City of Stockton employee (see pictures Attachment D). Twining Laboratories picked up the samples in the RWCF parking lot at 1116. Main Plant: The headworks have mechanical bar screens, which are automatically cleaned. The foul air pit is the headworks vented directly to the atmosphere. The foul air pit is a source for a large portion of the facility's odor issue. Several primary sedimentation tanks precede the trickling filter bio-towers.