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C1*4%,N8r1NC. SACRAMENTO <br /> 1. 0 INTRODUCTION <br /> This report describes the methods, procedures and findings <br /> of an interim remediation/pilot study at the Pacific Bell <br /> switching station facility, located at 7644 Ashley Lane in <br /> Stockton, California (hereinafter referred to as the site) . The <br /> site location is shown in Figure 1. <br /> This Interim Remediation/Pilot Study Report has been <br /> prepared by Versar Inc. (Versar) on behalf of Pacific Bell as <br /> part of the remediation of diesel--impacted soils at the site. <br /> The interim remediation/pilot study was approved by the San <br /> Joaquin County Public Health Services - Environmental Health <br /> Division (SJEHD) , as an addendum to the original remediation <br /> workplan (Versar, 1990) . <br /> 1. 1 Backc <br /> iroundZSite History <br /> The Pacific Bell Ashley Road facility is located in San <br /> Joaquin County, northeast of the city of Stockton, California. <br /> Figure 2 presents the layout of the site. The property was <br /> equipped with a 1, 000-gallon underground storage tank (UST) which <br /> was used to store diesel to operate the facility's emergency <br /> generator. As part of an upgrade of the facility, Pacific Bell <br /> contracted LBME Corporation (LBME) to remove and replace the UST. <br /> In April 1988, petroleum hydrocarbons as diesel were detected <br /> through the analysis of two soil samples collected during the <br /> removal of the UST. An Unauthorized Release/Contaminated Site <br /> Report was submitted to SJEHD by LBME on behalf of Pacific Bell . <br /> Based upon a letter work plan prepared by LBME, a site <br /> investigation was conducted on October 31 and November 1, 1988. <br /> At the request of Pacific Bell, the investigation, which included <br /> the drilling of four boreholes, was supervised by Versar. The <br /> results of the investigation were documented, by Versar in a <br /> report entitled "Site Assessment of the Pacific Bell Ashley Road <br />[ Stockton Facility (UE-132) " (Versar, 1989) . The site <br /> 1 <br /> I <br />