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i sI p 3.4.2 Table 3, Analytical Results, "Lateral Extent"� i_ Sample # Depth Benzene, Toluene, Ethyl Total TPH ppb ppb Benzene,; Xylene, Gasoline, ppb ppb PPI HA West c@17 16.5-17 ND ND ND bo ND HA West ®19 18.5-19 ND ND ND ND ND HA West @27 26.5-27 ND ND ND ND ND HA South c@17 16.5-17 ND ND ND ND ND HA South @19 18.5-19 ND ND ND ND ND HA South @27 26.5-27 ND ND ND ND ND HA East @17 16.5-17 ND ND ND �� ND ND . ' HA East @19 18.5-19 ND ND ND ND ND HA East @27 26.5-27 ND ND ND NDND HA North @17 16.5-17 ND ND ND ND' ND HA North r@19 18.5-19 ND ND ND ND ND HA North @27 26.5-27 ND ND ND 3 ND ND 4.0 Conclusion&THscussion from/of Site Investigation 4.1 Native Soils I� The soil boring logs from Beta Associates, the May 1993 investigation, and the December 1994 investigation,describe the native soil; (see Appendix Boring Logs). The upper soil, from surface to approximately eighteen feet, is generally clay containing varying portions of silt and sand. From approximately 18.4 feet to approximately 25 feet there is a silty sand layer. From approximately 25 j feet to 29 feet there is a clayey sand. From approximately 29 to 35 feet there is a very stiff clayey silt. From approximately 35 to 43 feet there is a stiff silty clay. From approximately 43 feet to the bottom of the beta boring @55 feet there is silty sand. Beta encountered water in the sand layer at approximately 43 to 55 feet. 4.2 Extent of Contamination The boring performed in May of 1993 shows soil vertical contamination extent; [contamination commencing at approximately 16.5 feet and ending at approximately 27 feet]. Further investigation performed in December of 1994 indicates the contamination has not migrated laterally beyond the limits of the area directly beneath the original tank excavation. Page 4 i ,�I