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layer Increased oxygen would result in increased bioactivity. As the diesel affected <br /> substrata generally consists of sands and silty sands, the SVE system was generally quite <br /> effective. The residual diesel impacted soils appear to be areally Iimited <br /> 6.0 Recommendations <br /> Although the SVE system appears to have indirectly reduced the diesel impact to soil quality, <br /> areally limited residual diesel concentrations exist at this time Since, the ground surface <br /> overlying the former tank location is not sealed, the potential for leaching of the diesel fuel <br /> still exists rT recommends spot excavation to remove the residual diesel impacted silty soils <br /> located beneath the former tank location, so that site closure may be obtained <br /> MZ/12-08-93/ENG/93-1065 nbr <br /> 8 <br />