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3.0 CONCLUSIONS, RECOMMENDATIONS AND PROJECT STATUS <br /> Between September 15, and December 22, 2003, the groundwater surface rose an average of <br /> 1 08 feet, the groundwater gradient decreased from 0 0080 to 0 0025 foottfoot, and the <br /> groundwater flow direction shifted approximately 55 degrees toward the north-northwest These <br /> groundwater flow and gradient characteristics are relatively consistent with historical trends <br /> Between September 15, and December 22, 2003, the concentrations of TPH-as-gasoline and <br /> BTEX compounds decreased in MW-1 and MW-3, possibly due to fluctuations in the groundwater <br /> surface elevation The concentration of benzene at MW-3 of 13 micrograms per liter(µg11) <br /> exceeds the Maximum Contaminant Level of 1 µg11 <br /> As shown on Figure 6, the lateral extent of impacted groundwater appears to be concentrated <br /> beneath the western and central portions of the site, and remains undefined to the west and <br /> northwest of the former UST system Despite the close proximity and shallow construction of the <br /> on-site water supply well and nearby domestic wells, they do not appear to have been impacted <br /> by gasoline compounds released from the former UST system However, given the risks <br /> associated with operating a water supply well at the site, Ramage Environmental recommends <br /> that the well be properly destroyed, and that the site be connected to city water service <br /> To further evaluate the concentrations of gasoline compounds in groundwater beneath the site, <br /> Ramage Environmental recommends that quarterly groundwater monitoring, sampling and <br /> analysis continue The next monitoring event is scheduled for March 2004 If gasoline <br /> compounds continue to exist in MW-3, it may be necessary to complete additional site <br /> investigation and/or remedial activities <br /> 8 <br />