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r <br /> Chevron/South Center <br /> November 1989 <br /> - 6 <br /> D Samples of the native soil will be collected for <br /> laboratory analyses at the limits of the excavation <br /> both laterally and vertically based on observed rued field <br /> o If the limits of h <br /> ydrocarbon-impacted soils cannot be <br /> established or field evidence ;indicates that <br /> hydrocarbons <br /> may f y have migrated to the water table, up <br /> to four on-site soil borings will be drilled. These <br /> borings will extend below the water table and be <br /> completed as r <br /> groundwater monitoring wells. The wells <br /> Will be developed and sampled to <br /> assess the <br /> presence of dissolved-hydrocarbons in the possible <br /> groundwater. <br /> o A report of the results and findings of this <br /> -- will be issued.will <br /> t TANK REMOVAL <br /> The four existing underground-storage tanks will be <br /> removed <br /> by licensed subcontractors, prior to excavation, the tanks will <br /> be emptied and triple-rinsed with the rinsate being removed b <br /> vacuum truck. Once the tanks are completel Y <br /> will be inverted Y exposed, the tanks <br /> Prior to their removal. This will be done by <br /> placing an appropriate amount of dry ice into each tank throe h <br /> �. the fill pipe. Carbon dioxide from the dr g <br /> [ _ residual hydrocarbon vapors. Y ice displaces any <br /> p An air-monitoring explosion meter <br /> will be used to check conditions <br /> inside each tank. When safe, <br /> the tanks will be removed from the <br /> transported off site for disposal. ground using a backhoe and <br /> underground fuel lines will be removedditionally, all existing <br /> GRol.. [)11,ATfiR <br /> TEC[{s0l0C1,.INC, <br />