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yF <br /> F <br /> Results of Initial Investigation and Work Plan December 18, M,0 <br /> ARCO Service Station No. 760, Lodi, California ACS 38048-4 <br /> roil with greater than 10 ppm of fPHg and grea'.er than 1.0 ppm benzene remains in place. <br /> Excavation will continue until the depth of the excavation reaches the safe operating limits <br /> of the equipment with respect to the sidewali stability and surrounding structures. The tank- <br /> removal contractor will be responsible for evaluating the safe limits of all excavations, <br /> sidewall stability, and safe operating limits of the equipment. After the excavation is <br /> terminated, appropriate soil samples will be collected from the limits of the excavated area <br /> do to evaluate if hydrocarbonous soil was removed•by excavation. <br /> Excavated soil will be stockpiled onsite. Composite soil samples will be collected and <br /> analyzed to evaluate disposal options. The stockpiles be covered with plastic sheeting <br /> to restrict vapor emissions and control dust. The disposal of stockpiled soil is ARCO's <br /> responsibility. <br /> Excavation o1? <br /> f Proposed Tank�avity l) <br /> �s <br /> Excavation in the proposed tank cavity will continue until soil containing greater than 10 <br /> « ppm of TPHg and greater than 1,0 ppm benzene is removed, however, excavation will be 4 <br /> terminated if the depth of the excavation reaches the safe operating limits of the equipment <br /> o.if further excavation would endanger any existing structures. We estimate that the final <br /> depth of the excavation will be approximately 12 feet below grade but could be deeper <br /> r' depending on site conditions. One soil sample will be collected under each proposed tank <br /> location. Sidewall soil samples will be collected only if soil exhibiting evidence of <br /> t hydrocarbons remains in place. <br /> m <br /> Excavated soil will be stockpiled onsite. The stockpiles will be covered with plastic sheeting <br /> to restrict vapor emissions and control dust. Composite soil samples will be collected and <br /> analyzed to evaluate disposal options. If Iabc_ziory results of composite soil samples <br /> 15 <br /> -Applied Ge0.5ystems <br />