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CAMBRIA s TPHg, at a concentration of 2 58 ppm, was detected only in the 65 fbg soil sample from SB-4 Benzene was detected in soil samples collected from SB-4 only at depths of 65 fbg, 70 fbg, 75 fbg, and 105 fbg at concentrations of 0 124 ppm, 0 212 ppm, 0 0186 ppm, and 0 00925 ppm, respectively 1,2-dichloroethane was detected only in the 70 fbg soil sample from SB-4 at a concentration of 0 141 ppm Boring SB-5 was drilled west of SB-4 to delineate the lateral extent of petroleum hydrocarbons in soil Soil samples collected from this boring at depths of 30 fbg to 80 fbg (at 10-foot intervals) did not contain TPHg or benzene with one exception Benzene was detected at a concentration of 0 127 ppm in the sample collected from 70 fbg Boring SB-6 was drilled east of SB-4 to delineate the lateral extent of petroleum hydrocarbons in soil Soil samples collected from this boring at depths of 10 fbg, 20 fbg, 30 fbg, and 70 fbg contained TPHg at concentrations of 1,640 ppm, 7,820 ppm, 370 ppm, and 15 1 ppm, respectively Benzene was not detected in any of the soil samples from boring SB-6 • Soil samples collected from well S-4 did not contain detectable levels of TPHg and BTEX MTBE (by EPA Method 8020) was not detected in any of the soil samples collected from borings SB-4, SB-5, and SB-6 The soil chemical analytical data are summarized in Table 2 and are presented on Figure 2 The certified analytical reports for the soil samples are presented in Appendix E HYDROCARBON DISTRIBUTION IN GROUNDWATER Groundwater samples collected from boring SB-4 at 60 fbg contained 3,900 ppb of TPHg and 3 96 ppb of benzene The groundwater samples from 72 fbg contained 22,700 ppb of TPHg and 3,150 ppb of benzene Groundwater sample collected at 82 fbg contained 21,800 ppb of TPHg, and 131 ppb of benzene The groundwater samples collected at 95 fbg contained 90 3 ppb of TPHg and 1 00 ppb of benzene MTBE was not detected in any of the groundwater samples collected from boring S13-4 One groundwater sample was also collected from boring SB-5 at 56 fbg This sample contained 431 ppb of TPHg, <0 500 ppb of benzene, and 1 82 ppb of MTBE (by EPA Method 8260) 0797 6