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_ . <br /> e : <br /> 11 10 11 <br /> NEW <br /> Results of Initial Investigation and Work Flan December 18, 1990 <br /> ARCO Service Station No. 548, Stockton, California AGS 30004-2 <br /> analyzed to evaluate disposal options. If laboratory results of composite soil samples <br /> indicate concentrations of TPHg and BTFX compounds are less than 10 and 1.0 ppm, <br /> respectively,the soil will be used to backfill the former gasoline tank cavity. If laboratory <br /> results of the composite soil samples indicate concentrations of TPHg and BTEX <br /> compounds are greater than 10 and 1.0 ppm respectively, the soil will be disposed of <br /> �+ properly. The disposal of stockpiled soil is ARCO's responsibility. <br /> Excavation of Wasteit vi <br /> A geologist from Appli::d GeoSystems will be onsite to obsteo,".excavation of the waste-oil <br /> tank. Immediately following the removal of the four existing underground-storage tanks,the <br /> f: tank cavity will be excavated to a depth between 2 and 4 feet below the former tank. A soil <br /> sample will be collected within 2 to 4 feet below the base of the former fill port to evaluate <br /> if waste oil remains in place. <br /> �p If field evidence or laboratory analyses indicate waste oil remains in place,we will observe <br /> excavation of soil in and around the existing waste-oil tank until the safe operating limits <br /> 1: of the equipment with respect to sidewall stability and the surrounding structures are <br /> reached. After the excavation is terminated,other soil samples will be collected to evaluate <br /> the vertical or lateral extent of waste oil. These soil samples will be analyzed for the <br /> compounds detected in the soil sample collected from under the fill ports. <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 wail is ARCO's <br /> responsibility._ -- - - - - - - - - <br /> - <br /> x <br /> 14 <br /> r <br /> INS�ti ' <br />