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�s <br /> 'k <br /> Y <br /> December 18, 1990 <br /> Results of Initial Investigation and Work Plan DeceAGS 30004-2 <br /> ARCO Ser rice Station No.548, Stockton, California <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 operating limits <br /> of the equipment with respect to the sidewall 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 /> to evaluate if hydrocarbonous soil has been removed by excavation. <br /> Composite soil samples will be collected and <br /> Excavated soil will be stockpiled onsite. <br /> analyzed #o evaluate disposal optionss. The stockpiles will be covered with plastic sheeting <br /> f., <br /> to restrict vapor emissions and control dust. The disposal of stockpiled soil is ARCO's <br /> responsibility. <br /> s F�rcava'o of Pro edxl]y <br /> l� <br /> Excavation in the proposed tank cavity will continue until soil containing greater than 10 <br /> and greater than 1.0 pm benzene is removed; however, excavation will be <br /> ppm of TPHg g p <br /> equipment with respect to the sidewall stability <br /> terminated if the safe operating limits of the <br /> e® We estimate that the final depth of the excavation <br /> and surrounding structures are reached. <br /> will be approximately 12 feet below grade. One soil sample will be collected under.each <br /> " proposed tank location. Sidewall soil"samples will be collected ot�iy if..soiI containing <br /> a. t evidence of hydrocarbons remains in place.' <br /> 4 <br /> Excavated soil will be stockpiled onsite. The stockpiles will be covered" =t plastic sheeting i <br /> to restrict vapor emissions and control dust:-Composite sail samples will be collected and - <br /> 13 <br /> s - <br /> ,q, P ed GooSystems <br /> aj <br /> Ill M1111min 1 11,11MM 1111 11 in �1110'111111 1111 NOW ill M'IMM'IMM, .11=1 Mason <br /> 4 <br /> N .. <br />