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t' } <br /> overexcavation over the use of air sparging/vapor extraction due to similar costs with a faster and <br /> more effective cleanup using overexcavation. <br /> PHS/EHD recommends that in order to properly determine which alternative would be more cost <br /> effective the vertical extent of soil contamination below groundwater should be determined. The <br /> required analyses should reflect data obtained from the'tank removal which confirmed the <br /> presence of diesel, gasoline, benzene, toluene, ethyl benzene and xylene. <br /> Summary <br /> In conclusion, PHS/EHD concurs with the recommendations contained in the CAP for tank area <br /> 3,4,5,6 and tank area I. Vertical definition of tank area 8 is necessary to determine the cost <br /> effectiveness of overexcavation and air sparge with vapor extraction. Please submit a workplan <br /> that will provide a method to determine the vertical extent of contamination below the tank 8 area <br /> by December 5 1997. <br /> If you have any questions, please contact Steve Sasson REHS, at(209)468-3459. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> StevenSasson, Senior REHS Margare Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> cc: Mel Jacobo, SWRCB <br /> cc: Pat Anderson, CVRWQCB ' <br /> cc: Kevin McKibben, Advanced Geo Environmental <br /> . i <br /> i <br />