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4.0 CONCLUSIONS AND RECOMMENDATIONS <br /> In sal, significant concentrations of TPH-as-gasoline, BTEX and MTBE extend through the <br />' unsaturated soil to groundwater beneath the former UST#3 Although the lateral extent of <br /> impacted soil is undefined, former UST #3 appears to be the primary source of gasoline in <br />' groundwater beneath the site <br /> In groundwater, gasoline hydrocarbons are concentrated as free product near former UST#3 <br />' Concentrations of gasoline compounds decrease with distance to the east and northeast of <br /> former UST#3 As shown on the isoconcentration map for MTBE in groundwater (Figure 4), the <br />' lateral extent of impacted groundwater at the water table is undefined The vertical extent of <br /> impacted groundwater has not been investigated <br /> 1 Between December 18, 2000 and December 6, 2001, the groundwater surface dropped an <br /> average of 3 13 feet The groundwater flow direction appears to be toward the south, away from <br /> the municipal irrigation well <br /> Although the irrigation well was inactive, a sample collected from the pressure tank did not contain <br /> detectable concentrations of gasoline compounds An additional water well sample should be <br /> collected from the irrigation well, while the well is active during the spring or summer <br /> Based on these conclusions, Ramage Environmental recommends that a work plan be prepared <br /> to further investigate the lateral and vertical extent of impacted soil and groundwater, and to <br />' initiate sal and groundwater remediation at the site <br /> 1 <br />' 11 <br /> 1 <br />