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C A M B R I A <br /> data are summarized in Table 2 and presented on Plate 2 Laboratory analytical data are <br /> presented in Appendix C <br /> HYDROCARBON DISTRIBUTION IN WATER <br /> The water samples collected from Boring SB-3 contained 46,000 parts per billion (ppb) <br /> TPHg, 243 ppb benzene, and 28,000 ppb MTBE The water samples collected from Boring <br /> SB-4 contained 6,610 ppb TPHg, 63 6 ppb benzene, and 9,080 ppb MTBE <br /> Groundwater chemical analytical data are summarized in Table 3 and presented on Plate 2 <br /> Laboratory analytical data are presented in Appendix C <br /> CONCLUSIONS <br /> The soil analytical data indicate MTBE has migrated vertically through the soil to <br /> groundwater Groundwater was encountered at an approximate depth of 50 fbg Soil samples <br /> collected beneath groundwater (Borings SB-3 and SB-4) contained less than 0 5 ppm of <br /> • MTBE Based on these data, it appears that MTBE has not migrated vertically a significant <br /> distance into saturated soils <br /> Groundwater samples collected from Borings SB-3 and SB-4 indicate MTBE is present in <br /> groundwater at concentrations ranging from 9,080 to 28,400 ppb TPHg and benzene were <br /> also detected in groundwater at concentrations ranging from 6610 to 46,000ppb for TPHg, <br /> and 63 6 to 243 ppb for benzene <br /> Recommendations <br /> Cambria recommends further investigation at this site to determine the lateral extent of <br /> petroleum hydrocarbons and MTBE in soil and groundwater in the vicinity of this site <br /> 241-0955 4 <br />