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l <br /> U <br /> i <br /> i Ramage Environmental recognizes that the lateral extent of impacted vadose zone soil is not <br /> defined to the south and that diesel concentrations of 10,000 ppm are present within 6 feet of <br /> the current groundwater surface. As such, the recommendation to consider the site for closure <br /> i <br /> is based on the following assumptions: <br /> • The lateral extent of residual diesel hydrocarbons in a southerly direction from the former <br /> { <br /> UST does not exceed 2 f - <br /> -� 0 feet beyond SB 6. This allows for an assumed finite amount of <br /> �E diesel plume mass; <br /> • Concentrations of petroleum hydrocarbons do not increase in the undefined part of the <br /> plume; <br /> Groundwater elevations will not increase in the future such that contact between residual <br />` diesel hydrocarbons and non-impacted groundwater does not occur; <br /> f <br /> • Any future leaching of residual diesel hydrocarbons to groundwater via rainfall infiltration is <br /> not significant. <br /> J <br /> i <br /> r 12 <br />