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' ATTACHMENT A <br /> SUMMARY OF PREVIOUS INVESTIGATIONS <br /> Chevron Service Station 9-1452, 334 East Main Street, Ripon, California <br /> On September 27, 1995 four underground storage tanks were removed, including two <br /> 10,000-gallon gasoline tanks, one 5,000-gallon gasoline tank, and one 1,000-gallon waste-oil <br /> tank Three 12,000-gallon gasoline USTs were installed northwest of the former UST <br /> complex <br /> Four groundwater-monitoring wells have been installed previously at the site Laboratory <br /> test results from fourth quarter 1997 groundwater monitoring, the last data available, reported <br /> no detectable concentrations of total petroleum hydrocarbons quantified as diesel (TPHd) and <br /> total petroleum hydrocarbons quantified as gasoline (TPHg), benzene, toluene, ethyl <br /> benzene, and xylenes (BTEX), or methyl tertiary butyl ether (MtBE) Groundwater flow was <br /> reported consistently to the southwest at gradients ranging from 0 0002 to 0 003 feet/feet <br />