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f, benzene, 5,000 ppb total xylenes and 16,000 ppb MTBE were detected in grab groundwater samples collected from the UST excavations A total of 15 soil samples were collected along the pipelines Up to 9,600 p p m TPH-G, 9,900 ppm TPH-D, 9 7 ppm benzene, 500 ppm toluene, 190 p p in ethyl benzene, 1,100 ppm total xylenes and 10 ppm MTBE were detected in soil samples collected along the pipelines Other compounds detected in the soil samples collected along the piping were up to 23 ppm vinyl acetate, 15 ppm isopropylbenzene, 51 ppm n-propylbenzene, 330 ppm 1,3,5-trimethylbenzene, 910 ppm 1,2,4-trimethylbenzene, 2 3 ppm sec- buylbenzene and 140 ppm n-butylbenzene Approximately 726 tons of contaminated soil were overexcavated from the former tank excavations and were disposed of at the Altamont Landfill in Livermore, California 2 -5 August 1999 Area Wen Survey In August 1998, Remedy, Inc conducted an area well survey for the site and identified 46 drinking water wells within 0 5 miles from the site, including a drinking water well on-site Groundwater samples were collected from the on-site drinking water well in July 1997, January 1998 , April 1998 and July 1998 Up to 24 ppb 1,2-dichloropropane (1,2-DCP) was detected in groundwater samples collected from the drinking water well 2-f) April 1999 CPT Borings In April 1999, ASE drilled soil borings CPT-13 and CPT-14 at the site using a CPT direct push drill rig (Figure 3) Groundwater samples were collected from the borings at 40-feet bgs, 70-feet bgs and 117-feet bgs using a SimulProbe sampler Relatively low petroleum-hydrocarbon and VOC concentrations were detected in the groundwater samples collected from the CPT borings It is interesting to note that the petroleum-hydrocarbon concentrations detected in both of these CPT borings were approximately five times higher at a depth of 70-feet bgs than at 40-feet bgs The only hydrocarbons and/oi VOCs detected in the groundwater samples collected from 117-feet bgs was 69 ppb TPH-G and 4 6 ppb 1 ,2- dichloropropane The only concentration detected in any of these samples which exceeded a California Department of Health Services (DHS) maximum contaminant level (MCL) for drinking water was 4 8 ppb benzene detected in the groundwater sample collected from 70-feet bgs in boring CPT-13 All of the other concentrations detected were below DHS MCLs for drinking water Frank's One Stop Workplan — December 2000 -3-