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lFelemar.c. SACRAMENTO <br /> 1 .0 INTRODUCTION <br /> The purpose of this report is to present Versar's remediation plan <br /> for the diesel fuel contamination at the Pacific Bell facility (UE-132) <br /> located at 7644 Ashley Road, Stockton, California. The contaminated <br /> material consists of soil from the former location of an underground <br /> storage tank (UST) which contained diesel fuel . Remediation will involve <br /> the excavation of soil at the UST site which contains greater than 100 <br /> milligrams per kilogram (mg/kg) total petroleum hydrocarbons (TPH) . After <br /> excavation, the contaminated soil will either be treated on site <br /> utilizing bioremediation or disposed of in a Class I landfill untreated. <br /> An underground fuel storage tank was removed at the Pacific Bell <br /> Ashley Road facility in April , 1988. Soil samples obtained from beneath <br /> the tank contained petroleum hydrocarbons, which were identified by <br /> Eureka Laboratories, Inc. , as diesel fuel . On May 12, 1988, the results <br /> were reported to the San Joaquin Local Health District (SJLHD) in a <br /> report by LBME Corporation. A site assessment was conducted on October <br /> 31, and November 1, 1988, which entailed the drilling of four boreholes <br /> in and around the former location of the UST. Laboratory analysis of <br /> soil samples obtained during drilling identified significant levels of <br /> diesel fuel contamination in the vicinity of the former LIST. Also <br /> detected in the analyses were low levels of benzene, toluene, <br /> ethylbenzene, and xylene (BTEX) of undetermined etiology. The <br /> contamination extends to a depth of approximately 33 feet below surface <br /> level and it does not appear to have reached the ground water. <br /> u <br /> 2.0 ENVIRONMENTAL SETTING <br /> 2. 1 Facility Location and Operations <br /> The Pacific Bell Ashley Road facility is located in a rural area of <br /> San Joaquin County, approximately two miles east of Highway 99 and <br /> approximately 100 yards north of the Calaveras River. The location of <br /> the facility is shown in Figure 2-1 and Figure 2-2. The site layout is <br /> 1� <br /> 1 <br />