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Geological Tecluttcsl Page 4 <br /> ' Groundwater Monitoring Report <br /> Project No 662 2 <br /> January 25,2006 <br /> As required under AB2886, the groundwater elevation & laboratory data were submitted <br /> electronically to GeoTracker on January 24, 2006 (confirmation # 4963560342 & <br /> ' 1582968473) <br /> 2,0 FINDINGS AND DISCUSSION <br /> The results of the groundwater sample analyses indicate the following <br /> ' Shallow Aquifer <br /> ' • Well MW-1 contained the gasoline oxygenate MTBE at 1770 µg/1 This well has <br /> consistently contained MTBE The well also contained 82 5 ug/1 TPH-G This is the <br /> fourth consecutive event in which TPH-G was detected in the well above the laboratory <br /> ' reporting limit <br /> • Well MW-2, which is upgradient of the former USTs, has not contained contaminant <br /> concentrations above the laboratory detection limits for all quarterly events completed <br /> ' thus far in the investigation <br /> • Well MW-3 contained the gasoline oxygenate MTBE at 2310 µg/1 and 50 8 ug/l TPH-G <br /> Extraction well EW-2 contained 932 µg/l MTBE The well had contained TPH-G for the <br /> three previous events, but not this time <br /> Deep Aquifer <br /> ' • Well MW-5 contained 1 1 µg/1 MTBE <br /> • Well MW-6 contained 86 µg/i TPH-G <br /> • Well MW-104 contained 8 µg/1 MTBE <br /> ' The distribution ofg roundwater contaminants is summarized as follows <br /> ' (Note The Isoconcentration contours are generated utilizing the SURFER® computer <br /> modeling program We recognize that computer generated contour maps do not provide the <br /> ' most accurate representation of what is taking place to the field However, even hand- <br /> contoured maps at best provide a shadow of reality Both need to be looked at as <br /> interpretation, not reality) <br /> ' • Figure 4 Shallow Well MTBE Concentrations shows that the highest level of MTBE <br /> (2310 ug/1) is present in well MW-3 The plume is limited in lateral extent and attenuates <br /> to the north, northwest and southeast locations of well MW-1, MW-2 and EW-2, <br /> respectively <br /> • Figure 5 Shallow Well TPH-G Concentrations shows that the highest level of TPH-G <br /> (82 5 ug/1) is present in well MW-1 The plume is limited in lateral extent and it <br /> attenuates to the west and south locations of well MW-2 and MW-3 <br />