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CHRONOLOGY OF EVENTS <br /> GRANITE CONSTRUCTION FACILITY <br /> 10500 South Harlan Road <br /> French Camp, California <br /> 1992 <br /> April 22, 1992 - Five underground storage tanks (USTs) and associated dispenser <br /> islands were removed from the site by Aronson Engineering of <br /> Rancho Cordova, CA. Subsequent analysis of soil samples revealed <br /> detectable concentrations of petroleum hydrocarbons beneath the <br /> USTs and former dispenser islands. <br /> 1993 <br /> l <br /> March 9-12, 1993 - Drilled a total of 20 soil borings (B 1 - B 17) and constructed three <br /> groundwater monitoring wells.(MW1 -MW3). Soil borings BI <br /> and B2 were"angle" drilled beneath the former waste oil UST. I <br /> The remaining borings were drilled in the vicinity of the former <br /> USTs and dispenser island. A total of 40 soil samples were <br /> analyzed for petroleum hydrocarbons. Analysis of soil samples <br /> collected from the"angle" borings did not reveal elevated <br /> concentrations of petroleum hydrocarbons or waste oil metals. <br /> Petroleum hydrocarbons as diesel were detected at a depth of at <br /> least 12"feet beneath the former dispenser islands. Subsurface soils <br /> in the vicinity of the former USTs revealed TPH as gasoline to <br /> depths ranging from,45 to 25 feet. <br /> March 26, 1993 - Groundwater samples were collected from monitoring wells MW 1 - <br /> MW3. Monitoring well MW1 and MW2 did not reveal any TPH as <br /> gasoline or BTEX. However, monitoring wells MW3 revealed <br /> WALLACE•KUHL <br /> &ASSOCIATES INC. <br /> Recycled paper - <br />