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• The maximum concentration of petroleum hydrocarbons for each layer was <br /> used to predict migration rates It was assumed that this concentration was <br /> present throughout the entire layer. <br /> * The depth to groundwater (55 feet) was based on the most recent <br /> groundwater sampling round conducted by ERM-West At this depth, the <br /> environmental fate and transport modeling predicted that the petroleum <br /> hydrocarbons would not reach groundwater Historical groundwater levels to <br /> the vicinity of the site provided by the San Joaquin County of Public Works <br /> have generally demonstrated that groundwater levels are substantially below <br /> the deepest estimated depth of petroleum hydrocarbon migration It is <br /> estimated that continued water demand will result in sustained groundwater <br /> pumping, maintaining the present groundwater table elevation In addition, <br /> the partitioning studies suggest that no detectable petroleum hydrocarbons <br /> would partition into the groundwater <br /> i <br /> G UMIMAn"E FNUlo"W 26 93 5-2 chendtMe 1993 <br /> I <br />