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�� m - <br /> Q <br /> Results of Initial Investigation and Work Plan December 18, 1990 <br /> ARCO Service Station No. 2076, Lodi,California AGS 30008-2 <br /> We will collect two soil samples within 2 to 4 feet below the base of each former <br /> underground tank. If PID readings are less than 50 ppmv, we will submit the soil samples <br /> to the laboratory for analyses. If PID readings are greater than 50 ppmv,we will observe <br /> additional excavation in the gasoline-tank cavity until PID readings are less than 50 ppmv. <br /> We will then collect soil samples from the additional excavation and submit these soil <br /> samples to the laboratory. We will continue excavating only if laboratory results indicate <br /> soil with greater than 10 ppm of TPHg and greater than 1.0 ppm benzene remains in place. <br /> Excavation will continue until the depth of the excavation reaches the safe operatill;limits <br /> of the equipment with respect to the surrounding structures. The tank removal contractor <br /> will be responsible for evaluating the safe limits of all excavations, sidewall stability, and <br /> X' safe operating limits of the equipment. After the excavation is terminated,appropriate soil <br /> r samples will be collected from the limits of additional excavated area to evaluate if <br /> 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 will be covered with plastic sheeting <br /> . to restrict vapor emissions and control dust. The disposal of stockpiled soil is ARCO's <br /> responsibility. <br /> f <br /> Eya#im of Proposed_Tank Cavy► <br /> ,a <br /> Excavation in the proposed tank cavity will continue until soil containing greater than 10 <br /> �5 ppm of TPHg and greater than 1.0 ppm benzene is removed; however, excavation will be <br /> F <br /> terminated if the depth of the excavation reaches.the safe operating limits of the equipment <br /> or if further excavation would endanger any existing structures. We estimate that the final <br /> y <br /> 4 ---depth of the excavation-will-be-approximately 12-feet-below-grade-but-could-be.deeper T--T <br /> , <br /> s 12. <br /> '��SM4fVMs <br />