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N • WIFernmar.c. SACRAMENTO } drilling at the Pacific Bell Stockton facility. 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 LBME report and the SJLHD letter are included in Versar's Site Assessment report which is enclosed here as Appendix A. 4.0 VERSAR INVESTIGATION On October 31, and November 1, 1988, the preliminary investigation of the soil contamination at the Pacific Bell Ashley Road 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. A detailed discussion of the investigation w procedures, observations, and conclusions can be found in the Versar report entitled: Site Assessment of the Pacific Bell Ashley Road Stockton Facility (UE-132) 7644 Ashley Road, Stockton, California, dated January 3, 1989, which is included as Appendix A. Four boreholes were drilled in and around the former site of the UST. The locations are shown in Figure 4-1. Boreholes BH3, BH4, and BHS were located on the perimeter of the UST excavation site. Each of the three boreholes were completed to a depth of 31 .5 feet below the " surface, which was 15 feet below the deepest detected contamination based on headspace analyses. Borehole BH1 was located over the center of the UST excavation site. Borehole BH1 was extended to 41 .5 feet below the surface, which was 10 feet below the deepest detected contamination from headspace analyses. Based on headspace analysis six soil samples were analyzed for TPH by EPA Method 8015M and for BTEX by EPA Method 8020 by Chemwest Analytical Laboratory, Inc. The chain of custody form and the laboratory analytical results are included in Appendix A and are summarized in Table 4-1 . 7