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3164 Gold Camp Drive <br /> Suite 200 <br /> Rancho Cordova,CA 95670-6021 <br /> ��Q Environmental U 5 A <br /> Consultants,Inc. 916/638 2085 <br /> FAX 916/638 8385 <br /> November 22, 2000 <br /> Ms Lon Duncan <br /> San Joaquin County, Public Health Services c::: <br /> Environmental Health Division C�) <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 ;; <br /> Subject Soil and Groundwater Investigation Report <br /> ARCO Facility No 2168 ' r, <br /> 441 West Charter Way <br /> Stockton, California <br /> Delta Project No D000-329-1 <br /> Dear Ms Duncan <br /> Delta Environmental Consultants, Inc (Delta) was contracted by Atlantic Richfield <br /> Company (ARCO) to conduct a soil and groundwater investigation at former ARCO <br /> Facility No 2168, located at 441 West Charter Way, Stockton, California (Figure 1) The <br /> objectives of the assessment activities were to assess the vertical and lateral extent of the <br /> petroleum hydrocarbon impacts to soil and groundwater and to further evaluate the <br /> hydrogeology beneath the site Delta implemented the scope of work presented in the <br /> Soil and Water Investigation Work Plan (September 29, 1999) and the Addendum to <br /> Work Plan (December 20, 1999) prepared by the IT Group and subsequently approved by <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> SITE BACKGROUND <br /> The following site background was compiled from the September 29, 1999 work plan <br /> submitted by the IT Group <br /> ARCO Facility 2168 operated until 1995 Between July 1991 and October 1993 RESNA <br /> Industries (RESNA) completed 21 soil borings Seven bonngs were converted to <br /> groundwater monitoring wells (MW 1 through MW7) and seven borings were converted <br /> to vapor extraction wells (VW-1 through VW-7) Between May 1995 and July 1996 <br /> EMCON installed six additional vapor extraction wells (VW-8 through VW-13) <br /> Providing a Competitive Edge <br />