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C A M B R I A <br /> Soil Types Encountered LEthology encountered while drilling the borings consisted <br /> primarily of silt and clay with lesser amounts of sand to the <br /> total explored depth of the boring (Appendix A) A sand <br /> layer at the approximate depth of 10 fbg was noted in each of <br /> the four CPT logs Alternating silt and clay layers were found <br /> below this sand layer to the depth of approximately 43 fbg <br /> Below this depth, alternating silt, clay, and sand layers were <br /> encountered in each of the four borings Although there was a <br /> general increase in the occurrence of sand below 43 feet, the <br /> depths of these sand layers did not correlate well from boring <br /> to boring <br /> Soil Chemical Analyses Selected soil samples were analyzed for TPHg, benzene, <br /> toluene, ethylbenzene, and xylenes (BTEX), by EPA Method <br /> 8015/8020 (Modified), fuel oxygenates (tertiary amyl methyl <br /> ether (TAME), tertiary butyl alcohol (TBA), di-isopropyl <br /> ether (DIPE), MTBE, ethyl tertiary butyl ether <br /> . (ETBE), ethanol), 1,2-dichloroethane (1,2-DCA) and <br /> 1,2-dibrromethane (EDB) by PA 8260B, and methanol by <br /> 8015M <br /> Groundwater Analyses Groundwater samples were analyzed for TPHg, BTEX by EPA <br /> Method 8015/8020 (Modified), oxygenates, ethanol, 1,2- <br /> DCA and EDB by EPA 8260B, methanol by 8015M <br /> HYDROCARBON DISTRIBUTION IN SOIL <br /> TPHg was detected in four of 33 soil samples collected from CPT-1 through CPT-4 at <br /> concentrations ranging from 8 85 ppm to 3,150 ppm The highest TPHg concentration was <br /> from 50 fbg in boring CPT-2 Benzene was detected in 21 of 33 soil samples collected from <br /> the four borings at concentrations ranging from 0 00826 ppm to 24 7 ppm The highest <br /> benzene concentration was from the 50 fbg sample from boring CPT-2 MTBE (by EPA <br /> Method 8260B) was detected in only one of 33 soil samples, 0 0334 ppm from boring CPT-l <br /> at 60 fbg No other fuel oxygenates or lead scavengers were detected in the soil samples <br /> collected from borings CPT-1 through CPT-4 Soil chemical analytical data are summarized <br /> in Table 2 and presented on Figure 2 Laboratory analytical data are presented in <br /> • Appendix B <br /> 1399 4 <br />