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D 3164 Gold Camp Drive <br /> Delta Suite 200 <br /> Rancho <br /> Cordova,CA 95670-6021 <br /> Environmental U.S.A. <br /> Consultants,Inc. 9161638-2085 <br /> FAX:9161638-8385 <br /> i <br /> August 17, 2001 <br /> n <br /> Mrs. Margaret Lagorio <br /> San Joaquin County, Public Health Services <br /> Environmental Health Division ry <br /> 304 East Weber Avenue, Third Floor r%0 <br /> Stockton, California 95202 <br /> Subject: Well Installation Report <br /> ARCO Facility No. 5469 <br /> 130 South Wilson Way <br /> Stockton, California <br /> Delta Project No. D000-336 <br /> Dear Mrs. Lagorio: <br /> Delta Environmental Consultants, Inc. (Delta) was contracted by Atlantic Richfield Company <br /> (ARCO) to install four groundwater monitoring wells at ARCO Facility No. 5469 (the site), <br /> located at 130 South Wilson Way in Stockton, California (Figure 1). The objectives of the <br /> assessment activities were to assess the vertical and lateral extent of petroleum hydrocarbon <br /> impact to soil and groundwater. <br /> In a letter dated January 24, 2001, San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS/EHD) requested further characterization of soil and groundwater at the <br /> site. On March 19,. 2001, Delta submitted a Work Plan for Additional Site Assessment, <br /> proposing the installation of two additional onsite groundwater monitoring wells in the northeast <br /> portion of the Site to evaluate the lateral extent of petroleum hydrocarbon impact to groundwater. <br /> In a letter dated April 4, 2001, San Joaquin County PHS/EHD requested a Work Plan Addendum <br /> to evaluate the vertical extent of petroleum hydrocarbon impact to groundwater in this area. <br /> Therefore on May 14, 2001, Delta submitted the Work Plan Addendum, proposing the <br /> installation of two additional monitoring wells screened to a depth of approximately 70 feet <br /> below ground surface (bgs). San Joaquin County PHS/EHD subsequently approved the Work <br /> Plan Addendum on May 21, 2001. This report presents the data collected during the installation <br /> and sampling of the groundwater monitoring wells. Also included in this report are the results of <br /> a search for water production wells within a 2,000-foot radius of the site. <br /> Providing a Competitive Edge <br />