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J) <br /> 3164 Gold Camp Driva <br /> . y - Suite 200 <br /> Rancho CDrdova,CA 9557()-6021 <br /> U.S.A. <br /> 915/638-2085 <br /> FAX:916/638-8385 <br /> October 4, 2000 <br /> Mr. Ronald Ro,,ve <br /> San Joaquin County, Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Subject: Well Installation Report <br /> ARCO Facility No. 5469 <br /> 130)0 South Wilson Way <br /> Stockton, California <br /> Delta Project No. D000-336 <br /> Dear Mr. Rowe: <br /> Delta Environmental Consultants, Inc. (Delta) was contracted by Atlantic Richfield Company <br /> (AP CO) to install six 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 the hydrocarbon-affected <br /> soil and evaluate groundwater quality beneath the site. <br /> In a letter dated February 2, 2000, the San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD) requested further characterization of soil and <br /> groundwater at the. site. The request was based on the findings of soil sampling performed <br /> during product line removal activities in February 1999. In response to the letter, the IT Group <br /> (IT) proposed to install three onsite groundwater monitoring wells. In a letter dated April 4, <br /> 1999, PHS/EHD issued a Workplan Approval Letter that requested additional wells be installed. <br /> On May 1, 1999, Delta submitted a Workplan Addendum proposing a total of six onsite <br /> groundwater monitoring wells, This report presents the data collected during the installation and <br /> sampling of the groundwater monitoring wells. <br /> Site Background <br /> In February 1999, IT observed the removal and replacement of product lines and associated <br /> dispensers. Soil samples were collected at depths ranging between 3.3 to 5.5 feet below ground <br /> surface (bgs) in the vicinity of the product lines and dispenser locations following their removal. <br /> Samples collected in the vicinity of the dispenser islands indicated the presence of total <br /> petroleum hydrocarbons as gasoline (TP14G) at concentrations ranging up to 7.32 milligrams per <br /> Provid!ng a, oomast,:,,Ve Edge- <br />