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April 28, 1988 AG.' Job No. 038012-1 <br /> Former UNOCAL Service Station, Stockton, California <br /> total petrolet• .i hydrocarbons (TPH) by Environmental Protection <br /> Agency (EPA) Method 8015 (modified) and the volatile organic <br /> constituents benzene, toluene, ethylbenzene, and total xylene <br /> isomers (BETX) by EPA Method 8020. This procedure was also used <br /> to characterize the relatively uncontaminated soil. Additional <br /> soil samples were taken from the base of the deepened excavation <br /> r <br /> in the manner described above and analyzed for TPH, BETY., and <br /> organic lead. The results of these analyses are shown in Tables <br /> 1 and 2. A Chain of Custody Record was initiated by the sampler <br /> and accompanied the samples to the analytical laboratory. A copy <br /> :, .• of this record is included in Appendix A of this report. <br /> On April 7, 1988, excavated soil that had been stockpiled at the <br /> F site was removed to the yard of North Cal Construction for <br /> aeration with the approval of the SJLHD and the California <br /> Regional Water Quality Control Board. The tank cavity was then <br /> backfilled under the direction of UNOCAL personnel using <br /> materials and methods selected by UNOCAL. <br /> v <br />