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R10/71-51-1C <br /> o Drilling of 11 new soil boreholes and converting six of these boreholes into <br /> groundwater monitoring wells The new wells are MW13, MW14, MW16, <br /> MW19, MW20, and MW24 <br /> 1 o ix of Development p s new groundwater wells, <br /> o Measurement of water levels in the new and old wells, <br /> 1 o Sampling of newly-installed wells <br /> Tables 10A through 10P (see Appendix C) tabulate analytical results on sod samples at <br /> each sampling horizon Soil samples were initially collected at depth of 1 25 or 1 5 feet <br /> below grade and then at every five feet below grade thereafter In general, the following <br /> sampling locations have non-detectable to low levels of gasoline-derived contaminants <br /> including benzene, toluene and xylenes SB15, MW16, SB18, MW19, MW20, SB22, SB23 <br /> and MW24 The following sampling locations have varying levels of gasoline-derived <br /> contaminants at different horizons MW13, MW14, and SB17 These latter locations are <br /> around the gravel area where underground tanks were removed in the past <br /> Moderate levels of gasoline-derived contaminants are found in MW13 from approximately <br /> 35 feet to 55 feet below the surface <br /> In MW14, the concentration of contaminants appear to increase going down from lust <br /> beneath the surface, maximizing between 25 to 40 feet below grade, and then at <br /> decreased levels down to 70 feet below grade <br /> High levels of gasoline-derived contaminants are found in SB17 at 40 and 45 feet below <br /> grade At this location, gasoline-derived contaminants range from non-detectable <br /> to low levels above 40 feet and high level below 45 feet It is only in SB17 where diesel <br /> contamination was found (at a concentration of 1,800 ug/kg at 1 5 feet below grade) <br /> No halogenated volatile organics were detected in all soil samples tested <br /> Sod samples in locations SB22 and SB23 were tested for total chromium Results P esu s for all <br /> samples tested are lower than the Total Threshold Limit Concentrations (TTLC) of 2,500 <br /> mg/kg and 500 mg/kg for Cr (111) and Cr (IV), respectively All results are also lower than <br /> ten times the Soluble Threshold Limit Concentrations (STLC) of Cr (111) and Cr (VI) which <br /> are 5,600 mg/kg and 50 mg/kg, respectively Hence, the Waste Extraction Test was not <br /> performed on these samples No polychlorinated biphenyls (PCBs) were found in sod <br /> samples from SB22 No gasoline-derived contaminants were found in sample from SB22 <br /> 2 <br />