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If soil samples from the floor of the new tank excavation contain hydrocarbons, conductor <br /> casings will be installed between the new tanks in the areas that contain residual <br /> of six conductor casings, two between each set.of tanks will be <br /> hydrocarbons. A maximum <br /> installed. The purpose of the conductors are to provide a large enough diameter casing to <br /> allow for future soil borings or vapor extraction wells in the area immediately adjacent to <br /> _ the new underground storage tanks. The conductor easings will be driven approximately'2 <br /> feet.into native soil then surrounded by clean pea gravel backfill. 'The conductors will be <br /> r( <br /> constructed of 12-inch-diameter schedule 80 polyvinyl chloride(PVC)non-perforated'casing: <br /> 1 <br /> The approximate limits of the proposed excavation are shown on Figure 3. The L <br /> i <br /> approximate limits of the excavation shown are based on information gathered during the <br /> 4 <br /> . 1limited environmental investigation. TF.;actual size of the excavation will he determined. <br /> 6r <br /> by site conditions and the extent and degree"of soil contamination encountered=duruig <br /> excavation. We estimate 3800 cubic yards of soil may be excavated. Excavated soil will be <br /> 1. <br /> stockpiled on-site. a stockpiles will be covered with plastic sheets so that vapor emissions <br /> 6� <br /> and dust controls re restricted. s <br /> � y j <br /> 6.2 Soil Sampling <br /> -- Once the excavations have been completed, soil samples will be collected for laboratory <br /> F analysis from the native soil at the base and walls of the excavations. Approximately one <br /> soil sample will be collected for every 20 square feet of excavated surface. Areas exhibiting <br /> ' J subjective evidence of hydrocarbon contamination will be sampled. <br /> 7 Doc#.r1RD6767W 1.1 <br />