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CAMBRIA <br /> Soil Types Soil types encountered in borings SB-7 through S13-11 include <br /> clay, silty clay, silt, clayey silt, sandy silt, sand, silty sand, and <br /> gravelly sand Another soil type encountered was "stiff fine- <br /> grained" which is a CPT category that does not translate directly <br /> the Unified Soil Classification System Comparing the CPT logs <br /> to boring logs from hollow-stem auger borings drilled nearby, it <br /> appears that soils logged as "stiff fine-grained" correspond to <br /> silts and clays In general, soils beneath the site are primarily <br /> fine-grained soils (silts and clays) with some coarser-grained <br /> zones (sands) occurring at depths of approximately 80 fbg and <br /> 110 fbg <br /> Chemical Analyses Groundwater and soil samples were analyzed for total <br /> petroleum hydrocarbons as gas (TPHg), benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX), methyl tertiary butyl ether <br /> (MTBE), ethanol, tertiary amyl methyl ether (TAME), ethyl <br /> tertiary butyl ether (ETBE), tertiary butyl alcohol (TBA), <br /> diisopropyl ether (D1PE), 1,2-dichloroethane (1,2-DCA), and <br /> ethylene dibromide (EDB)by EPA Method 8260 <br /> HYDROCARBON DISTRIBUTION IN SOIL <br /> Boring SB-8 was drilled slightly northwest of the northwestern dispenser island Soil samples <br /> were collected from this boring from 10 fbg to 80 fbg to assess the vertical extent of petroleum <br /> hydrocarbons in the soil TPHg and benzene were detected at 70 fbg at concentrations of 17 and <br /> 0 011 parts per million (ppm), respectively TPHg, benzene, fuel oxygenates, or lead scavengers <br /> were not detected in an of the other soil samples from boring SB-8 <br /> The soil chemical analytical data are summarized in Table 2 and are presented on Figure 2 The <br /> certified analytical reports for the soil samples are presented in Appendix C <br /> • <br /> 0797 3 <br />