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EXECUTIVE SUMMARY <br /> Upgradient Environmental Consultants visited the Valley Motors dealership on December S to <br /> measure water depths and collect groundwater samples from the four on-site monitoring wells The <br /> depth to groundwater is unchanged since September, and remains at an average depth of 32 feet <br /> below grade Depth measurements indicate that groundwater continues to flow to the east or <br /> northeast <br /> After the depth to groundwater was measured,the wells were purged with a submersible <br /> groundwater pump and water samples were collected with disposable Teflon bailers,poured into <br /> 40-m1 vials and preserved for laboratory analysis Four samples were collected and analyzed foi <br /> TPH-gasoline using EPA method 602 and for BTEX using EPA method 8020 <br /> Hydrocarbon concentrations decreased substantially in VM-1 during the quarter, and for the first <br /> time since monitoring began m 1996, gasoline (TPH-g)was not detected Ethylbenzene and xylene <br /> also decreased below detection limits Substantial decreases were also reported in each of the other <br /> wells, including a 50%decrease in all analytes in VM-2 These results are very encouraging, but the <br /> cause of such a significant change is unknown <br /> 1 <br />