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,r 1 grade in the existing tank area. The purpose of the excavation is to remove as much of the <br /> C" <br /> contaminated soil as possible. Following completion of soil excavation and tank <br /> replacement activities,soil borings will be drilled to further delineate the extent and degree <br /> of contaminated soil not excavated. Arco will then evaluate remedial options based on the <br /> results of the delineation. <br /> i <br /> I., Excavation in the existing tank cavity will continue until the depth of the excavation exceeds <br /> i <br /> the safe operating limits of the equipment or if further excavation would endanger the ! <br /> existing station building. The tank i6m6val contractor will be'responsible for-all"civil <br /> t <br /> excavation will be between <br /> engineering at the Site. We estimate that the final depth of the <br /> 5 <br /> T 20 and 25 feet below grade. Soil samples will be collected from the native soil at the,base <br /> and walls.of.the`exeavationr,° <br /> a 6.1.2 New Tar.: Cavity Excavation <br /> � R <br /> i..f <br /> Excavation in the proposed new tank cavity will continue, if possible, until no subjective <br /> { evidence of contamination remains. If the depth of the excavation exceeds the site <br /> 1 <br /> operating lirn�w of the equipment or if further excavation would endanger the building, <br /> pump islands, or Patterson Pass Road, the excavation will be terinated. We estimate that <br /> m <br /> ,the final depth of the'excavation will be between 20 and 25 feet below grade. Soil samples <br /> i w will then be collected from the native soil at the base and walls of the excavation. <br />} _ 6 Doc#ARc6767W..1.r <br />_ 4 <br />