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A10/71-51-1c <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 /> 1 to low levels above 40 feet and high levels below 45 feet <br /> Diesel contamination was found only in two samples Diesel was found at a high level of <br /> 1,800 mg/kg at 1 5 feet below grade in S131 Diesel was detected at a low levelof 5 3 <br /> mg/kg at 40 feet below grade in MW13 <br /> 1 No halogenated volatile organics were detected in all sod samples tested <br /> Sod samples in locations SB22 and SB23 were tested for total chromium SB22 and SB23 <br /> are within the area of the former waste oil tank Results for all samples tested are lower <br /> than the Total Threshold Limit Concentrations (TTLC) of 2,500 mg/kg and 500 mg/kg for <br /> Cr(111) and Cr (IV), respectively (see Table 12, Appendix D) All results are also lower than <br /> ten tames the Soluble Threshold Limit Concentrations (STLC) of Cr(III) 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 sal <br /> samples from SB22 (see Table 12, Appendix C) No gasoline-derived contaminants were <br /> found in sample from SB22 A low level (18 mg/kg) of total petroleum hydrocarbons was <br /> found at the depth of 35 feet in SB22 (see Table 12, Appendix C) <br /> 5 2 2 Groundwater <br /> Table 8 (See Appendix C) summarizes the results of the analyses of groundwater <br /> samples In general, non-detectable to low levels of gasoline-derived contaminants (e g , <br /> benzene, toluene, ethylbenzene and total xylenes) were found at the following <br /> groundwater monitoring wells MW7, MW12, MW14, MW16, MW19, MW20 and MW24 <br /> Gasoline-derived contaminants exceeding water quality goals (see Table 8, Appendix C) <br /> are found in monitoring wells MW10, MW11 for the wells located in Shop 10 Appendix <br /> J presents Figures 26, 27, and 28 which show zero concentration maps for benzene, <br /> toluene and xylenes respectively, for the groundwater at Shop 10 <br /> A low level of chloroform at 11 u L was detected only see Table 8, Appendix <br /> 9/ Y in MW19 � PP <br /> C) This result is isolated <br /> 17 <br />