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1 <br /> LJ <br /> Geological Technics inc. Page 4 <br /> { Interim Soil Investigation <br /> Project No.750.2 <br /> October 2,2003 <br /> 3.0 RESULTS OF INVESTIGATION <br /> Summary analytical data tables are included in Appendix A. Laboratory Data Sheets are <br /> included in Appendix C and borehole logs are included in Appendix B. The analytical <br /> results and field observations are discussed below. <br /> 3.1 Soil Analytical Results <br /> 4+ In summary: <br /> ❑ All samples from SB-1 were non-detect for all analyzed constituents <br /> ❑ No observable contamination at any depth was noted in samples collected from SB-1 <br /> ❑ Field samples from SB-2 collected between 5 and 35 feet bgs showed evidence of <br /> contamination <br /> ❑ Five samples from SB-2 were sent to the Sherwood Labs Corporation for analyses the <br /> i <br /> results are as follows: <br /> • SB-2 at 14.5 feet bgs: Elevated concentrations of BTEX, TPH-G and TBA <br /> • SB-2 at 19.5 feet bgs: Detectable concentrations of BTEX and TPH-G <br /> L • Samples collected from 34.5, 44.5 and 54.5 feet bgs were non-detect for all analyzed <br /> constituents <br /> ❑. MTBE was non-detect in all soil samples. <br /> 3.2 Geology and Field Observations <br /> The following section discusses the subjective field observations and geology documented <br /> during.this investigation based on the interpretations of the field geologist. <br /> ' ❑ Top two feet of the site appears to be backfill materials comprised of gravel and sand <br /> ❑ A brown, poorly sorted, sand from 5 to 10 feet bgs overlies a dry, light brown, silt unit <br /> between 10 and 20 feet bgs <br /> �. ❑ The geology consists of various layers of grey colored silt and sand from 20 to 30 feet <br /> bgs <br /> ❑ The predominant geology between 30 and 45 feet bgs is comprised of a buff color, <br /> I poorly sorted sand containing some clasts greater thanl centimeter in size <br /> ❑ Grey silt and sandy silt layers were noted between 43.5 and 50 feet bgs <br /> ❑ Sand characterizes the 50 to 55 foot interval — buff and well sorted at 50 feet bgs <br /> i <br /> grading down to brown and poorly sorted at 55 feet bgs <br /> t <br /> 4.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 1 This investigation was an effort to determine the effectiveness of the Vapor Extraction <br /> L� System employed at the site. The following conclusions have been drawn from the data <br /> generated from this site investigation work: <br /> Lr' <br /> i <br /> 1 ' <br /> t <br /> f <br />