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C' A M B R I A V;CE <br /> 03 JU,I 30 AM 11: 56 <br /> June 24, 2003 <br /> Mr Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> Re Site Investigation Report <br /> Shell-branded Service Station <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> SAP Code 136186 <br /> Incident No 98996222 <br /> Dear Mr Knoll <br /> Cambria Environmental Technology, Inc (Cambna) on behalf of Equilon Enterprises LLC dba <br /> Shell Oil Products US (Shell) prepared this report to document site )Investigation activities <br /> performed during December 2001 at the above referenced site (Figures I and 2) This <br /> investigation was performed to assess the vertical extent of gasoline constituents in groundwater <br /> beneath the site The scope of work followed during this investigation was presented in <br /> Cambria's April 26, 2001 Site Investigation Work Plan and was approved by theJSan Joaquin <br /> County Environmental Health Department (SJCEHD) in their June 15, 2001 letter to Shell The <br /> work was performed in accordance with SJCEHD and Regional Water Quality Control Board <br /> guidelines <br /> The delay in reporting this data results from unresolved encroachment permit issues with the City <br /> of Tracy We were seeking an encroachment permit for the installation of the proposed offsite <br /> wells Since an encroachment permit was never granted we have not installed the offsite wells <br /> During the period of time when we were pursuing the encroachment permit, the periodic <br /> groundwater extraction program dramatically reduced groundwater impact beneath the site The <br /> results of vertical extent investigation (this report) and the apparent success of the remedial <br /> efforts at this site seem to suggest that the installation of additional groundwater monitoring <br /> wells is no longer warranted <br /> Oakland CA <br /> San Ramon CA We had intended to prepare one site investigation report that documented the vertical delineation <br /> Sonoma, CA work as well as the well installation work Since it appears that the wells may not need to be <br /> installed, we are reporting only the vertical delineation findings in this report This report also <br /> Cambna includes our rationale for not installing the five groundwater monitoring wells proposed in our <br /> Environmental <br /> Technology, Inc April 26, 2001 work plan <br /> GeTkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />