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w 3) CQnr njl Alions of Hydrogai-�ns in the Skil 13 Iow the Product Linrs: <br /> Laboratory analyses of the four soil samples collected from the base of the former <br /> product line trenches indicated 1PFI-G concentrations from 300 to 5,700 mg/kg <br /> " (Table 2). Maximum levels of BTEX were as follows: <br /> • benzene, 115 mg/kg <br /> • toluene, 400 mg/kg <br /> • ethylbenzene, 130 mg/kg <br /> • total xylenes, 360 mg/kg <br /> To facilitate further investigation and possible remediation of the Site, nine conductor <br /> casings have been installed (Figure 5). The conductor casing consist of 12-inch diameter <br /> PVC soli, pipe installed from Iand surface to the base of the tank cavity excavation. Each <br /> conductor casing was covered at land surface with a traffic rated steel vault box. The <br /> conductor casings will enable the drilling of soil borings into the native soil below the tank <br /> cavity excavation. <br /> It is our understanding that ARCO has retained Applied GeoSystems to prepare a work <br /> plan and carry out a Site investigation to evaluate the horizontal and vertical extent of <br /> hydrocarbon impacted soil underlying the Site. <br /> wi <br /> RO63X ASS04NAT-S 11 Doc#AR06776W 1.1 <br /> r-� <br />