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1.0 EVMODUCTIONIPREVIOUS WORK <br /> This report is being submitted in response to a request by the San Joaquin County Public Health <br /> Services, EnvirGamental Health Division <br /> On March 31, 1989, an underground diesel tank was removed from the H J Heinz facility at <br /> 757 E 11th Street in Tracy. Soil contamination was noted in the sidewalls of the excavation. <br /> Soil samples were collected from each wall of the pit The laboratory results for the samples <br /> -- are included in Appendix I Due to elevated concentrations of diesel constituents in the soils, <br /> combined with presence of groundwater at approximately 10 feet observed in the pit, the San <br /> Joaquin Local Health District required further assessment of soil and groundwater contamination <br /> at the site <br /> On September 14, 17-21, and 24, 1990, the former tank pit area was excavated with a backhoe <br /> ' to remove as much contaminated soil as possible The lateral extent of the excavation was 10 <br /> feet west and east, 8 feet south and 32 feet north of the former tark pit All observable <br /> contaminated soil was removed in the east, and west directions. High voltage utilities and <br /> lighting structures prevented complete excavation of all contaminated soils above the water table <br /> along the northern and southern boundaries of the excavation However, it is clear that the vast u <br /> majority of the contaminated soil in the unsaturated zone has been removed The water table <br /> was encountered at a depth of 9 S feet below grade Approx.mately 800 cubic yards of soil <br /> were removed from the pit Sixteen soil pile composites were collected from this excavated <br /> material Also, soil samples were collected at the bottom of the pit along the side walls in seven <br /> locations These soil samples were submitted to B C Laboratories for analysts Laboratory <br /> data sheets are presented in Appendix II Data is summerized on Table 1 <br /> A composite of the sixteen composites submitted to B C Laboratories was analyzed for soluble <br /> and total metals The analyses showed metals concentrations which ranged from non-detectable <br /> to below the regulatory criteria set form by Title 22, Article II of the California Code of <br /> Regulations for hazardous waste <br /> H77SA8l2 WP l <br />