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• 3 7 September 2010 <br /> Mr. Mike Bauer <br /> Chevron Banta Terminal <br /> from the transmix filter vessels at the Site. Central Valley Water Board staff conducted a <br /> site visit on 20 July and was informed by Chevron staff that the total volume of the <br /> release was about 50 gallons. A 31 August email from ARCADIS listed the suite of <br /> laboratory analytical tests that will be performed on soil samples obtained from the <br /> excavation. Page 15 of the Second QMR states that details of the release will be <br /> presented under separate cover. <br /> Our comments are presented below. <br /> 1. We concur with Chevron's proposal to submit a work plan to evaluate the <br /> of the work <br /> chromatograms of TPHd detections at this Site.To expedite our app <br /> roval plan, the work plan must (1) limit the evaluation to a single sampling event, <br /> (2) include all on- and off-site detections, (3) include submittal of the laboratory <br /> analytical results of an equipment blank and all standardso conduct an evaluation of <br /> sed to create the <br /> calibration curve for the sampling event, and (4) propose <br /> the existing oxygenation system to determine whether operation of the remedial <br /> system is delivering a mass of oxygen sufficient to consume the TPHd and MTBE <br /> -plume-emanating-of-site to-the north. <br /> 2. To fuitherinvesfigate the possibility that pollutants in some of the monitoring wells <br /> on Chevron's property may have originated from the card lock facility, Central Valley <br /> Water Board staff contacted San Joaquin County Environmental Health Department <br /> (County) staff and requested contact information for parties with financial <br /> responsibility for the facility. Through email correspondence, County st ch had <br /> Pstatedaff that <br /> the card lock facility is operated by Valley Pacific Petroleum (VPP), <br /> documented spills in 1998 and 2008. <br /> The County's report on the 14 March 1998 spill shows that 40 to 50 gallons of diesel <br /> were released to a bermed area when the nozzle to a dispenser hose was reportedly <br /> deliberately severed. The fire department also estimates that about 7 to 8_gallons of <br /> diesel were released to the dirt roadway leading from the dispenser area after a plug <br /> was removed from the berm. Cleanup activities were conducted between <br /> 14 and 16 March, which generated five containers of waste consisting of dirt and <br /> adsorbent pads. <br /> The County's report on the 24 July 2008 release stated that the diesel release <br /> occurred when a tractor trailer be to a Lodi trucking company tipped <br /> water in the irrigation ditch at the southeastern entrance of VPP's facility. The <br /> County's emergency response report shows that about 21,000 gallons of fuel/water <br /> mixture and five drums of debris, adsorbent pads'and dirt were removed from the <br /> spill site. Subsequent groundwater to obtained from monitoring wells closest to - <br /> the spill do not display a spike in TPHd concentrations. <br /> Water Board staff will contact VPP to determine if-a subsurface investigation is <br /> warranted at that site. <br /> 3. Chevron's 31 August email regarding the 19 July 2010 release states that the area <br /> of concern has been excavated as deep and wide as the infrastructure and <br />