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21 <br /> 4 LABORATORY RESULTS <br /> This chapter provides a summary of laboratory results for soil and groundwater <br />' samples that were collected during this project's field activities Soil sample results include <br /> those that were measured during the chemical-analytical, physical, and microbiological tests <br /> 1 <br /> 4.1 Soil Sample Analytical Results <br /> 1 <br /> The 14 soil samples that were submitted for chemical analysis were selected to <br />' evaluate the extent and magnitude of potentially hydrocarbon-impacted soil Samples were <br /> also selected based on a request by the PHS/EHD to analyze soil between the depths of 35 to <br /> 55 feet BGS, which corresponds to depth to first groundwater in 1986 and current depth to <br />' groundwater, respectively <br /> As shown on Table 3, Soil Sample Analytical Results, only one of the 14 samples <br /> c <br /> contained measurable hydrocarbon concentrations The 60-foot-depth soil sample from <br /> Borehole MW-13, collected dust below the groundwater table, contained a benzene <br /> concentration of 10 micrograms per kilogram (µg/kg) Soil sample laboratory analytical <br /> reports are contained in Appendix D <br /> 4.2 Soil Sample Physical Test Results <br />' Four soil samples from boreholes MW-9 25 feet BGS), MW-10 (35 feet), and <br /> MW-11 (45 and 55 feet) were submitted to Burlington's materials laboratory for grain size <br /> analysis Test results are included in Appendix E, and summarized on Table 4 <br /> Grain size analyses indicate that the samples from boreholes MW-9 and MW-10 are <br /> relatively fine-grained (clay) since 95 to 96 percent of their soils passed a #200-screen sieve <br />' The samples from borehole MW-11 have more size gradation, and can be characterized as <br /> clayey sands <br /> 04/94/121382/125997/STOCKREP REP/i <br /> 1 <br />