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CAMBRIA HYDROCARBON DISTRIBUTION IN SOIL TPHg was detected in soil samples collected from borings B-1, B-2, B-3, and well boring MW-1 at concentrations ranging from 12 to 340 ppm. The highest TPHg concentrations were detected in the B-2/MW-1 area of the site Benzene,MTBE, and lead scavengers were not detected in any of the soil samples analyzed as part of this investigation /TBA was the only fuel oxygenate detected in soil during this investigation It was detected in soil samples collected from borings B-1 and B-2, and well borings MW4 and MW-5 0 k'b MOM The soil cherrucaI analytical data (including data from previous investigations) are summarized in Table 2 and TPHg, benzene, and MTBE concentrations are presented on Figure 4 Laboratory analytical reports are presented in Appendix D HYDROCARBON DISTRIBUTION IN GROUNDWATER Borings: TPHg was detected in groundwater samples collected fr L borings B-1, B-2, and B-3 at concentrations ranging from 240 to 18,000 parts per billion (pp ) Benzene was detected in the groundwater samples collected from borings B-2 and B-3 at concentrations of 2 4 and 6 0 ppb, respectively No fuel oxygenates or lead scavengers were detected in groundwater samples collected from borings B-1 through B-' No TPHg, benzene,fuel oxygenates, or lead scavengers were detected in groundwater samples collected from borings B4 through B-7 Monstoring Wells: TPHg was detected only in groundwater samples collected from wells MW-1 and MW-3 at concentrations of 680 and 210 ppb, respectively Benzene was detected in wells MW-1 and MW-3 at concentrations of 18 and 0 89 ppb, respectively TBA was detected in wells MW-1 and MW-3 at concentrations of 23 and 18 ppb, respectively 1, 2-DCA was detected in wells MW-3, MW-4, and MW-5 at concentrations of 16, 2 5,and 0 85 ppb,respectively The groundwater chemical analytical data are summarized in Table 3 and in the well concentrations table in Blaine's report (Appendix C), and the benzene and MTBE concentrations are presented on Figure 3 Laboratory analytical data are included in Blaine's report CONCLUSIONS The purpose of this investigation was to delineate the lateral and vertical extent of gasoline constituents previously detected in soil and groundwater beneath this site The soil sample data . from this investigation and the 2001 investigation indicate that the extent of hydrocarbon- impacted soil appears to be limited to the north-central portion of the site Borings in the 1660 5 r