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Dissolved petroleum hydrocarbons have been detected in groundwater (Upper A zone, A zone, and B zone) in <br /> the area of the former transmix UST. However, these results are commingled with petroleum hydrocarbon <br /> impacts located upgradient and/or downgradient of the former transmix UST. Hydrocarbons reported in <br /> groundwater samples collected from monitoring wells adjacent to the former transmix UST cannot readily be <br /> discerned from those associated with the surrounding AST plume, therefore, should be considered commingled. <br /> The elevated concentrations of dissolved petroleum hydrocarbons reported for groundwater samples collected <br /> from MW-69UA (located approximately 40 feet upgradient of the former transmix UST) in 4Q05 as <br /> summarized above, suggest this well may be located within the area impacted by the former UST, given the low <br /> horizontal gradient of the Upper A zone (i.e.; 0.003 ft/ft), or the existence of a possible upgradient source of <br /> ' petroleum hydrocarbons. <br /> BLASLAND, BOUCK &LEE, INC. <br /> 3124106 engineers,scientists,economists 4-2 <br /> J:\D0006\44634_00161022_Conceptual Site Model.doc <br />