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U-Haul#709-50 <br /> ' Additional Site Charactenzation Blaes Environmental <br /> 4• RESULTS AND FINDINGS <br /> ' 41 H TE T F Y R N IN 1L <br /> The characterization of hydrocarbons in soil involved incorporation of the following results of previous <br /> ' investigations, the stratigraphy of the site, recent observations taken during soil sampling, and laboratory <br /> analytical results of recent soil sampling <br /> 4 1 1r sous,Re ultc <br /> Results of the previous investigations conducted by ETS and Applied Consultants provided soil analytical <br /> data to approximately 70 and 75 feet bgs (Appendix A) In general, results of these investigations <br /> identified a release area near soil boring B7 The lateral extent of impacted soil was defined at soil <br /> borings B5 (MW-5), B6 (MW-6), and BS With one central boring (B7) and limited data from the other <br /> borings, the hydrocarbon plume remained undefined The recent soil sampling activities further defined <br /> the extent of hydrocarbons in soil <br /> 4 12 Cross SeQ11= <br /> Using the descriptions of soil from the six boreholes and other soil borings, Blaes Environmental <br />' developed two cross-section of the site (Figures 5 and 6) Both cross-sections indicate the soil beneath <br /> the site is not layered into easily definable stratigraphic horizons Rather, soil types vary with depth and <br /> locations Soil beneath the site consist of sandy silt, silt and sandy clay with interbedded silty sand and <br />' sand One visible trend with cross section A - A' indicates that soil on the eastern <br /> portion of the site is <br /> more clayey than the western portion of the site <br /> 4 13 Field Observations <br />' Observations made during drilling and soil sampling activities are described below The logs of soil <br /> borings are included as Appendix B <br /> + Soil collected at approximately 29 to 30 feet bgs in borehole DP-2 appeared to be saturated with <br /> free-phase hydrocarbons Soil at this depth consisted of silty sand Soil collected at the next <br /> sampling interval at approximately 49 to 51 feet bgs did not show evidence of free-phase <br /> hydrocarbons <br /> • Soil samples collected from approximately PP y 65 to 110 feet bgs at borehole DP-2 consisted of silty <br /> sand, and clayey sand at 110 feet bgs Soil samples collected within this depth interval did not <br /> 14 <br />