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Vintage Car Wash I - 2 - 1May 2007 <br /> 601 E. Miner Ave., Stockton ) t <br /> Comments: The Wodrplan is conditionally approved by Regional Board staff with the following <br /> modifications: <br /> 1) To be cost effective, justification for sampling needs to be supplied for the eight unnamed <br /> ample locations circled in the attachment. These sample locations do not relate to the <br /> known residual soil contamination from the UST; release. Please provide a letter <br /> justification to fire Workplan for the eight circled sample locations (southwest section of <br /> site), supported by prior data and/or rationale for inclusion in Workplan, for Regional Board <br /> staff approval at least two weeks prior to scheduled fieldwork, or slate in writing that the <br /> eight sample locations will not be incorporated into the fieldwork. <br /> 2) If there are any delays in acquiring access agreements for the off site sample locations, <br /> then the onsile sampling will occur independently of, and prior to, the offsite sampling. - <br /> Further, you are to polity me immediately of any site access delays. <br /> 3) The Workplan states that two soil borings will be advanced to provide samples for analyses <br /> of the physical properties for the soils. The Wodrplan does not specify in the text or show <br /> on the figures, which soil borings, will be used to determine soil physical properties. <br /> Please provide a revised Figure 3 with a letter clan(ation, no later than 10 May 2007, on <br /> the locations of the soil borings, and on how the soil data will be used in the risk <br /> assessment. <br /> 4) In addition to comparison to DTSC's guidance, Regional Board staff require comparison of <br /> the soil vapor data to the San Francisco Bay Regional Board Environmental Screening <br /> Levels (ESLs), which can be downloaded from the Internet at: <br /> hUpJhvww_waterboards.ca.govlsanfranciscobay/esl.him <br /> Please schedule the work as soon as passible (see attached DGS/GeoCon proposed <br /> schedule), acquire all permits from San Joaquin County Environmental Health Department, <br /> and give the County and I at least three working days notice prior to f idwork. You may <br /> contact me at (916) 4644615 or ybarthrin Awaterboardiseagov if you have questions or <br /> comments. <br /> Lr . <br /> James L Barton, P.G. <br /> Engineering Geologist <br /> cc. Mr. Mike Infurna, San Joaquin County Environmental Health Division, Stockton <br /> Mr. Kevin Brown, Geocon ConsuRanls, Inc., 3160 Gold Valley Drive, Suite 800, <br /> Rancho Cordova 95742 <br />