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son <br />. San Joaquin County Public Health Services a <br /> May 26, 1995 (9347-1246) <br /> Conclusions <br /> 1 "Sources" of hydrocarbons in ground water and soil have been removed from the site by <br /> excavation, direct liquid removal and operation of the vapor extraction system <br /> 2 The vent system has removed all of the petroleum hydrocarbons that can be practically <br /> remediated by vapor extraction Nearly 100% of the fuel currently consumed by the <br /> oxidizer is natural gas supplied by PG&E <br /> 3 The Shell-owned VAC 25 vapor extraction unit could be more effectively utilized at <br /> another site <br /> 4 The dissolved and adsorbed hydrocarbons remaining beneath the site may be effectively <br /> addressed using the proposed oxygenation/diffuser system to enhance naturally occurring <br /> attenuation processes <br /> Based on the above information, Fugro requests the approval of San Joaquin County <br /> Public Health Services to discontinue soil vapor extraction at the site and proceed with the <br /> Installation of the ground water oxygenation system Details of the oxygenation/diffuser system, <br />. including schematic drawings will be provided upon approval <br />• <br /> 93471246 LL'I 5 <br />