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r�, y . Beacon Station No 641 August 2, 1996 1210 East Hammer Lane Stockton California Letter Re ort and ranged from 11 to 12 mg/kg, and in samples collected from the dispenser excavation ranging from 10 to 12 mg/kg Soil samples collected from the product line trench were below laboratory detection limits for total lead Soil samples collected from the dispenser excavation were below laboratory detection limits for MTBE The two soil samples collected from the product line trench ranged from below laboratory detection limits (S-PL-1V) to 12 mg/kg (S-PL-IE) MTBE was detected in the soil samples analyzed from the UST excavation and ranged from below laboratory detection limits to 5 7 mg/kg Laboratory results are summarized in Table 1 Laboratory analytical reports and COC records are presented as Appendix B Soil samples were collected from the soil stockpile for disposal options These samples were collected at random locations in the stockpile to be composited at the laboratory and analyzed for gasoline hydrocarbons and total lead Laboratory results of the stockpiled soil composite OkiAppendix are listed in Table 2 Laboratory analytical reports and COC forms are presented as Appendix A Soil Disposal Soil generated dunng excavation operations was stockpiled on and covered with plastic sheeting prior to removal from the site for disposal On June 17 and 18, 1996, excavated soil was transported from the site by Luttrel Trucking of Bakersfield, California to the TPS Technology tit Facility in Richmond, California On July 11, 1996, Horizon personnel sampled additional stockpiled soil, approximately 100 yards, that was excavated from the product line and dispenser areas Results of the previously mentioned sampling are shown on Table 2 of this report This additional excavated soil was transported from the site by Luttrel Trucking to TPS on July 25, 1996 A total of approximately 1,100 cubic yards of soil were excavated and transported from the site Discussion 12 Following completion of the additional excavation, approval was given by SJCPHS to begin backfilling of the excavation and installation of the new USTs, associated piping and dispensers Ten 18-inch diameter conductor casings were installed in the overexcavated UST cavity and imported crushed rock was deposited Into the excavation to a depth that correlates to the approximate bottom of the new USTs The conductor casings will be utilized dunng future I subsurface assessment work in these areas The analytical results indicate that gasoline hydrocarbons are present in the soil in the vicinity of . the UST cavity at depths of 19 feet Soil containing gasoline hydrocarbons in other areas of the site, such as the dispenser islands, was removed by overexcavation 1641-11 rpt 3 HORIZON ENVIRONMENTAL INC