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. EXECUTIVE SUMMARY <br /> Upgradient Environmental Consultants visited the Valley Motors dealership on June 7 to measure <br /> water depths and collect groundwater samples from the six on-site wells The depth to groundwater <br /> is a few inches less than it was in March, when the site was last monitored Depth measurements <br /> indicate that groundwater continues to flow to the east <br /> After measuring the depth to groundwater, the wells were purged with a submersible groundwater <br /> pump and water samples were collected with disposable Teflon bailers,poured into 40-m1 vials and <br /> preserved for laboratory analysis All samples were analyzed for TPH-gasoline using EPA method <br /> 602 and for BTEX using EPA method 8020 The samples from two wells(VM-4 and S W-1) were <br /> also analyzed for five oxygenates using EPA method 8260 <br /> Since March, TPH-g concentrations have decreased in four of the five wells and BTEX <br /> concentrations have increased in two wells (VM-1 and VM-3) and decreased in two others (VM-2 <br /> and SW-1) Thus, BTEX concentrations have been on the rise in VM-1 and on the decline in VM-2 <br /> since October 1999 Concentrations in VM-3 and VM-4 have fluctuated during this period MTBE <br /> was detected at 0 8 µgd in VM4 Due to matrix interference from TPH-g(32,100 �tg/l), the <br /> detection limit for MTBE in SW-1 was 50 ppb, and no MTBE was detected above this limit <br /> • <br /> 1 <br />