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i <br /> 3' <br /> 2905 West Benjamin Holt Drive, Stockton, California March 16, 1994 <br /> Chevron U.S.A. Products Company _ Page 19 <br /> It appears that the highest percentage of hydrocarbon mass is contained in hydrocarbon-impacted soils. <br /> Therefore, remediation efforts will be most effective if.targeted at hydrocarbon-impacted soils both above <br /> and beneath the water table. Results of.bio-sparge.testing will determine the effectiveness of this <br /> remediation technology at depleting the mass of hydrocarbons in the unsaturated and saturated zones. <br /> A mass-removal technology (bio-sparging) is recommended because of its ability to remediate the <br /> remaining source of groundwater contamination in situ, while causing the lowest impact to service <br /> station business. Biodegradation of the!hydrocarbon mass reduces exposure to long-term liabilit that <br /> g Y <br /> could result by leaving the hydrocarbon impacted material in place. A remediation system for the site <br /> can be effectively designed once testing is complete and remediation goals for hydrocarbon-impacted <br /> soil and groundwater have been set. <br />{ <br /> I <br /> E <br /> f <br /> so73aaR.flPr _ V! GROUNDWATER <br /> TECHNOLOGY <br />