ARCHIVED REPORTS XR0000149 - Laserfiche WebLink

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Fe ;gill NC • 3.0 PREVIOUS WORK In April , 1988, a 1,000-gallon underground diesel storage tank was removed from in front of the building at the Pacific Bell Stockton facility. During the tank removal , two soil samples were taken from beneath the tank in the excavation pit, after which the excavation was filled. The soil samples were analyzed by Eureka Laboratories, Inc. , for total petroleum hydrocarbons (TPH) using EPA Method 8015M and for benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA Method 8020. Samples one and two were found to contain TPH, which were identified as diesel fuel , at levels of 2,980 milligrams per kilogram (mg/kg) and 1 ,000 mg/kg, respectively. Sample one also contained 0.073 (mg/kg) of xylene and 0.015 mg/kg of ethylbenzene, while sample two contained 0.0120 mg/kg of xylene and 0.025 mg/kg of ethylbenzene. The chain of custody and laboratory analytical results are included in Appendix A. The results of the laboratory analyses of the soil samples were reported to the SJLHD in a report from LBME Corporation dated May 12, 1988. Included in the LBME report was a work plan for preliminary drilling at the Pacific Bell Stockton facility. A copy of the LBME report is included in Appendix A. The SJLHD approved the proposed work plan contingent upon three considerations which were outlined in a letter dated August 12, 1988. A copy of the letter is enclosed as Appendix B. M 4.0 VERSAR INVESTIGATION On October 31, and November 1 , 1988, the preliminary investigation of the soil contamination at the Pacific Bell Stockton facility was undertaken. Versar Inc. was requested by Pacific Bell to oversee the geological aspects of the investigation and assess the reported soil contamination at the site. LBME Corporation contracted with Hogate Drilling Co. to drill a series of four boreholes in and around the 6