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4.0 FINDINGS 4.1 Stratigraphy and Field Observations Dry salt to fine sandy-silts were present in borings CB-1 and CB-2 from surface grade to a depth of approximately 20 feet Dry to damp sands were encountered from 20 feet to 30 feet and again from 35 feet to 53 feet Damp silts were present from 30 to 35 feet However, a gravel layer was noted in CB-2 from approximately 33 to 35 feet Fine sandy silt to clayey salt was present from 53 feet to 65 feet (total depth) Hydrocarbon odors were noted in samples from boring CB-1 at depths from 20 feet to 45 feet and in boring CB-2 at depths from 35 feet to 45 feet Organic vapors were detected by the PID at concentrations up to 564 ppm (CB2-35) The generalized stratigraphy between CB-1 and CB-2 is illustrated on Figure 3 Borings MW-8 and MW-9 penetrated silts from surface grade to 20 feet A silty clay was encountered in boring MW-9 near ground surface Stratigraphy in boring MW-8 vaned widely from 20 feet to 53 feet Soils consisted of inter-bedded clays, silts, sands and gravel Boring MW-9 contained a clay layer from approximately 22 feet to 28 feet, underlain by silt Fine sandy silt to clayey silt was present in both borings from approximately 53 feet to 75 feet (total depth) No hydrocarbon odors or organic vapors were detected in borings MW-8 or MW-9 The boring logs are included in Appendix B 4.2 Analytical Results of Soil Samples A total of 16 soil samples were analyzed for TPH as gasoline and BTE&X No petroleum hydrocarbons were detected in samples from MW-8 or MW-9 TPH as gasoline was detected in samples CB-1-20 and CBI-35 at 300 ppm and 2,200 ppm, respectively Toluene, ethylbenzene and xylenes were detected in sample C131-35 at concentrations of 0 14 ppm, 14 ppm, and 23 ppm, respectively TPH as gasoline was detected in boring CB-2 at depths of 30 feet and 35 feet (39 ppm and 450 ppm) Xylene was detected in C132-35 at 15 ppm Xylenes were detected in sample CB2-40 at a concentration of 0 0054 ppm No benzene was detected in any of the samples analyzed Figure 3 shows the initial extent of impacted soil from the drilling of MW-2 and EW-1 Figure 4 shows the extent of remaining impacted soil Two soil samples were analyzed for total lead Lead was detected in samples CB1-15 and CB1-20 at concentrations of 12 ppm and 9 ppm, respectively The analytical results of the soil samples are summarized in Table 2 The laboratory report and chain-of-custody are included in Appendix C C�bBa3 Acd1 Semsa I.c 0-w.5.k.ry'.n 94,11