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J <br /> 3.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Groundwater levels have dropped an average of 0.79 feet since groundwater levels were last <br /> measured on August 7, 1998. The groundwater gradient was calculated at 0.002 foottfoot in a <br /> northeasterly direction. This result is consistent with historical groundwater flow and gradient data. <br /> Concentrations of dissolved gasoline hydrocarbons in the groundwater samples collected this <br /> quarter from MW-6, MW-7, VW-1 and VW-2 remain relatively consistent with previous sampling <br /> g <br /> results. In VW-2, the concentration of TPH-as-gasoline increased from 550 ppb on August 7, 1998 <br /> to 4,200 ppb this quarter. Concentrations of benzene and MTBE in VW-2 also increased, since the <br /> last sampling event. In VW-1, the concentration of TPH-as-gasoline was below the detection limit <br /> of 50 ppb for the second consecutive quarter. TPH-as-gasoline, BTEX and MTBE were not <br /> 4 detected i - <br /> n MW 6 and MW-7. <br /> Ramage Environmental recommends the following course of environmental corrective action: <br /> i <br /> 1. Continue with the plan to construct and operate a soil vapor extraction and air sparging system <br /> at the site. <br /> 2. Continue to monitor and sample groundwater from the four water table wells on a quarterly <br /> basis. The UST Cleanup Fund has already pre-approved the cost of quarterly monitoring <br /> through February 1999. <br /> k. <br /> t{� <br /> k <br /> l <br /> 5 <br /> 1 <br />