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7 r i f i <br /> _�}s�CoR <br /> e <br /> - <br /> Into national Incorporated <br /> July 28, 1999 <br /> Protect No 7GO07-018-01 <br /> Mr Brett Hunter <br /> Chevron Products Company <br /> P O Box 6004 <br /> San Ramon, CA 94 583 <br /> Re Site Assessment Report <br /> Former Chevron Station 9-6258 <br /> 2409 East Main Street at F Street <br /> Stockton, California <br /> Dear Mr Hunter <br /> SECOR International Incorporated (SECOR) has prepared tlus letter on behalf of <br /> Chevron Products Company(Chevron)to document the results of a recent site <br /> assessment performed at the site referenced above (Figures 1 and 2) This assessment <br /> involved the drilling and sampling of three exploratory soil bongs, followed by the <br /> installation of three groundwater monitoring wells in the borings The purpose of the <br /> work was to evaluate the vertical and lateral extent of hydrocarbons in soil and <br /> groundwater beneath the site This work was performed as described in the SECOR <br /> Work Plan for Further Site Assessment, dated October 28, 1998 <br /> The San Joaquin County Department of Health Services, Environmental Health Division <br /> (SCEP`j approved the work plan on NovenA)er 2, 1998 With the approval, the <br /> SCEHD requested the following 1)a minimum of two boreholes should be continuously <br /> cored, 2)MtBE TAME, DIPE, and EtBE (Fuel Oxygenates) must be included in the <br /> laboratory analysts, and 3) a cross section of the three wells should be included with the <br /> report (Attachment A) <br /> SITE BACKGROUND AND PREVIOUS INVESTIGATIONS <br /> In February 1995, The Mark Group performed a Phase I Environmental Site Assessment <br /> (ESA) at the site and concluded that further investigation should be performed In April <br /> 1995, The Mark Group performed a preliminary subsurface investigation involving the <br /> drilling of six soil borings The Mark Group reported residual concentrations of <br /> hydrocarbons in the former UST excavation backfill Groundwater was not encountered <br /> and was reported to be in excess of 50 feet below the ground surface (bgs) <br /> 991213rt,rlre+� Palk 0)u, SieaL 100 Saclanuculo (A 95827 (916) i64-1880 (916) )64-P)89 lejx ucrup (Lo) coix <br />