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� v <br /> 0 <br /> A S S O C I A T E S I N C <br /> 4_2 Groundwater Analytical Results <br /> Detectable levels of MTBE were found 1n monitoring wells MW2, MW4R, MW5, MW6, and <br /> MW7 with the maximum contaminant level (MCL) exceeded at monitoring wells MW4R, MW5, <br /> and MW7 Benzene was , MW5, and MW7 Benzene was detected at monitoring well MW7 <br /> where the MCL was exceeded Total petroleum hydrocarbons as diesel was detected at <br /> monitoring wells MW3, MW4R, MW5, MW6, and MW7 Toluene, ethylbenzene, and xylenes <br /> were not detected during the April 2001 sampling event <br /> 5.0 DISCUSSION <br />' Soil samples collected from boring MW7, located on the levee, at 5 feet bgs contained moderate <br /> levels of MTBE and TPHg High concentrations of MTBE were found in groundwater at <br />' monitoring well MW7, the highest concentrations on site to date This MTBE plume appears to <br /> be related to the former product line located adjacent to the levee This also appears to be the <br /> source area for the MTBE plume ATC Associates recommends an evaluation of remedial <br />' alternatives and continued groundwater monitoring of the site <br /> I <br />' W 1625141reportslsup_sub_mv doc 6 <br />