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ATTACHMENT A <br /> SUMMARY OF PREVIOUS INVESTIGATIONS <br /> Chevron 9-4275, 2905 Benjamin Holt Drive, Stockton, CA <br /> was reported in 1995 ARCO's hydrocarbon plume may be co-mingled with the Chevron <br /> hydrocarbon plume, evidenced by elevated methyl tertiary butyl ether (MtBE) detections in MW- <br /> 9 on September 24, 1996, which was previously unaffected Historical MtBE concentrations in <br /> ARCO wells near Benjamin Holt Drive have been an order of magnitude greater than the <br /> Chevron wells <br /> The City of Stockton maintains a nearby inactive municipal well No 10, which is routinely <br /> sampled Second quarter 2001 laboratory results reported no detectable concentrations of TPHg, <br /> BTEX, or MtBE for the municipal well During the second quarter, groundwater was measured <br /> at approximately 7 5 to 10 feet bgs Groundwater flow was to the south at a gradient of 0 036 <br /> feet per foot (ft/ft) <br /> i <br />