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. extractionfinjection system <br /> 53 Groundwater_Monitoring <br /> Three previously-euishng monitoring wells were destroyed and four new monitoring wells <br /> (MW-1, MW-2, MW-3 and MW-4) were installed. Initial groundwater sampling of the new <br /> monitoring wells was conducted in May 1993 <br /> Groundwater sampling and analysis conducted subsequent to removal of impacted soil <br /> and the replacement of the pre-existing monitoring wells (January and April 1994) has shown <br /> an overall order-of-magnitude reduction of petroleum hydrocarbon concentrations {Table 4-1) <br /> The localized area of impacted groundwater is illustrated in isoconcentration plots for <br /> gasoline, diesel, and benzene (Drawings 4-1, 4-2, and 4-3) The impacted area is in the vicinity <br /> of monitoring well MW-2 <br /> i <br /> • <br /> FASCLOSE 5 5-2 92-1177102 36 <br />