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R10/71-51-1C <br /> o Pump and Treat with Air Stripping to remove/reduce groundwater <br /> contamination within the vicinity of the former underground fuel tanks <br /> Contaminated groundwater is pumped from one or more recovery wells and <br /> channelled to a collection point The contaminated groundwater is then <br /> treated by air stripping Air stripping is a unit process in which water and <br /> air are brought into contact with each other for the purpose of removing <br />' volatile substances from the waste stream The treated groundwater is then <br /> disposed of into POTW, natural water, or recharged /irrigated on site The <br /> present worth cost estimate of this option is $ 966,000 during a five year <br /> period of operation <br />' Excavation and removal of any remaining contaminated soil in the gravel area should first <br /> be initiated If a budding will be built over the area now contaminated, this should help <br /> retarding the downward flow of the contamination as the area will be capped and water <br />' percolation from rains and surface run-off will be minimized <br /> In any case, a groundwater extraction need to be initiated in order to prevent further <br />' spread of the contamination At least one extraction well should be located adjacent to <br /> the former tank location At resent a relative) "clean zone" of sal xi is between the <br /> present groundwater level of ap roximatel 68 ft below rade u to a roximatel 55 ft <br /> below rade within the vicinity of the former tank location If groundwater does not rise <br /> above 55 ft be ow grade, an i esu ace sod is adequately capped (as with the <br /> construction of a building above it), little downward movement of contaminants should be <br /> expected <br /> 1 <br /> 5 <br />