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ATTACHMENT A <br /> SUMMARY OF PREVIOUS INVESTIGATIONS <br /> Chevron 9-9840, 4344 Waterloo Road, Stockton, California <br /> MtBE was detected using EPA Method 8260 at concentrations of 98 µg/1 in the sample <br /> collected from MW-1 and 57 µg/1 in the sample collected from MW-2 Groundwater <br /> elevations across the site increased an average of approximately 2 61 feet this quarter <br /> Groundwater flow was to the northeast at 0 002 ft/ft, consistent with historical data <br /> i <br />