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V4Z! INC <br /> addition, the water sample was analyzed for MBTE using USEPA Test Method 524 All <br /> analytical results for this sample were reported to contain concentrations below analytical <br /> laboratory detection limits <br /> A workplan to conduct a vadose zone site assessment was prepared and submitted to <br /> PHSEHD The workplan was designed to complete the site assessment investigation by <br /> overexcavation of the hydrocarbon impacted soil within the area immediately below the <br /> former gasoline UST (Tank #1) The workplan was approved by PHSEHD and <br /> implemented on September 3, 1996 <br /> A John Deere 790 excavator and a front end loader were used to excavate the <br /> hydrocarbon impacted soil from beneath the former tank location A total of approximately <br /> 6,500 cubic yards of clean and hydrocarbon impacted soil was removed from the <br /> excavation Of this volume, approximately 3,000 cubic yards of soil was classified as <br /> hydrocarbon impacted and 3,500 cubic yards were classified as clean overburden <br /> Soil samples were collected from the floor and sidewalls of the excavation The soil <br /> samples were submitted to a State of California certified analytical laboratory for analysis <br /> Analytical results indicated that the majority of hydrocarbon impacted soil had been <br /> removed from the subsurface except for approximately 150 cubic yards of hydrocarbon <br /> impacted soil that was left in place along the west sidewall of the excavation because it <br /> would not been cost effective to remove this material without additional extensive <br /> excavation This hydrocarbon impacted soil is estimated to contain concentrations only <br /> of toluene (8 mglkg), xylene (13 mg/kg) and gasoline (trace detection at about 1 mglkg) <br /> The volume of gasoline fuel and its components within this volume of soil represents <br /> approximately 0 45 pounds of product remaining in the subsurface <br /> S08220010 011 4 <br />