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. 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 m 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 2 3 ppm vinyl acetate, 15 ppm isopropylbenzene, 5 1 ppm n-propylbenzene, 330 p p m 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 1998 Area Well Sur vey In August 1998, Remedy, Inc conducted an area well survey foi the site and identified 46 drinking water wells within 0 5 miles from the site, including a di inking water well on-Site Groundwater samples were collected from the on-site drinking water well in July 1997, Januazy 1998, Apiil 1998 and July 1998 Up to 24 ppb 1 ,2-dichloropiopane was detected in groundwater samples collected from the drinking water well 2 .6 Anril 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-hydi ocarbon 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- dichloropiopane 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 48 p p b 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 2.7 __�Ly_, 1999 Menyt�ring W�Lu Installat3en . In May 1999, ASE installed monitoring wells MWA through MW-10 at the site (Figure 3) Monitoring wells MWA through MW-6 are screened Frank's One Stop Workplan — September 2000 -3-