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ila <br /> Work Plan, Excavation and Soil Sampling April 24, 1989 <br /> ARCO Service Station No. 760, Lodi, California 38048-2W <br /> required before the SJLHD could permit additional excavation. <br /> One soil sample was collected from the base of the excavation, <br /> approximately 8 feet below grade (or 2 feet below the base of and <br /> adjacent to the fill-port end of the excavated tank) . The native <br /> soil that was sampled consisted of sandy silt. <br /> Becaese of safely considerations, ARCO requested that the <br /> excavation be backfilled with clean, imported pea gravel. ARCO <br /> f and Tom Mehringer Construction were responsible for the selection <br /> and placement of backfill. Excavated soil was placed on and <br /> covered with plastic sheeting. This soil was removed from the <br /> r=� site on September 16, 1988, and was taken by Universal <br /> Engineering to the Kettleman Hills Class Z Waste Management Unit. . <br /> �.a Laboratory analysis indicated that the: soil sample contained <br /> 1,660 parts per million (ppm) of total oil and grease (TOG) , 530 <br /> ppm total petroleum hydrocarbons (TPH) as diesel, 29 ppm TPH as <br /> gasoline and 630 ppm of 1,2--dichlorobenzene. In addition, the <br /> r <br /> sample contained 13 ppm of chromium and 17 212M-Of total lead. <br /> These concentratiors of heavy metals are below levels recommended <br /> a for soil by the California Department of Health Services (DHS) <br /> for chromiu�i but exceed those levels for lead. Polychlorinated <br /> t� <br /> ._, 3 <br /> y Apv/led GOOS.VSAMS 1 <br />