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3.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Based on the results of previous subsurface investigation, soil and groundwater beneath the north <br /> end of the former middle UST are impacted by relatively low concentrations of gasoline <br /> hydrocarbons Except for a couple of low detectable concentrations of MTBE in soil and <br /> 1 groundwater, the oxygenate compounds and 1,2-DCA are not present in soil or groundwater <br /> Most of the petroleum hydrocarbon mass remains concentrated in soil immediately below the <br /> north end of the former middle UST Vertically, the concentrations of gasoline hydrocarbons <br /> decrease rapidly with depth, and are defined between 65 and 80 feet bgs Based on the results <br /> from soil samples collected during the drilling of MW-1, MW-2 and MW-3, the lateral extent of <br /> impacted soil appears to be defined to the area of the former USTs <br /> Impacts to groundwater at the water table are defined to the northwest (MW-1), west (MW-2), and <br /> east (MW-3) The plume of impacted groundwater appears to be undefined to the south and <br /> north-northeast (downgradient) of the former USTs <br /> Based on these conclusions, Ramage Environmental recommends the following course of <br /> environmental corrective action <br /> 1 Continue to monitor and sample groundwater at the site on a quarterly basis The next <br /> groundwater monitoring is scheduled for March 2001 <br /> 2 Complete the sensitive receptor survey for the site vicinity and include it in the next quarterly <br /> groundwater monitoring report, due for publication in early May 2001 <br /> 3 Evaluate quarterly groundwater monitoring and sampling data to determine if an additional <br /> groundwater monitoring well should be installed downgradient of the former USTs <br /> 10 <br />