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WZ1 INC IDdirection of Mr Knoll The soil sample was collected from approximately eight feet below ground surface and was analyzed for benzene, toluene, xylene and total volatile petroleum hydrocarbons (TVPH) by modified U S Environmental Protection Agency (EPA) Test Method 8020, ethylene dfbromide (EDB) by EPA Test Method 8010 and total lead content by EPA Test Method 7420 Analytical laboratory results of these soil samples were reported to contain concentrations of volatile organic compounds (VOC) as high as 600 mg/kg and concentrations of lead as high as 18 mg/kg These data were previously provided to County Public Health in a report prepared by McLaren (1989a) Sebastiani Vineyards subsequently submitted a soil remediation work plan for the exploratory excavation and removal and treatment by aeration of approximately 170 to 300 cubic yards of petroleum hydrocarbon-contaminated soil that was to be excavated from the area directly below the former tank location to a depth of 18 5 feet below ground surface (bgs) The objectives of the exploratory excavation were to determine the extent of soil that had been impacted by petroleum hydrocarbons and remove the contaminated soil from the subsurface, where practical The exploratory excavation and removal of petroleum hydrocarbon-contaminated soil was conducted on April 6, 1989 Approximately 45 cubic yards of soil that was visibly contaminated by petroleum hydrocarbons was removed from the excavation which extended to a depth of 18 feet bgs The concentration of volatile organic compounds in soils was identified in the field, using field gas headspace measurements with a photoionization device (PID) Soil samples were also collected for headspace gas measurements from the backhoe bucket during the excavation work Results of the field gas headspace measurements ranged in concentration from a low of 200 mg/kg to a high of 960 mg/kg (McLaren, 1989a) 19150011 005 8