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1,2,4-trimethylbenzene, 2,2,4-trimethylpentane, 1,3-butadiene, 2-propanol, <br /> 2-butanone (methyl ethyl ketone), 4-methyl-2-pentanone, 4-ethyltoluene, <br /> acetone, carbon disulfide, cyclohexane, ethanol, heptane, propylbenzene, and <br /> tetra hyd rofu ran. CHHSLs have not been established for any of these <br /> compounds. <br /> Grab Groundwater Sample Analytical Results <br /> Grab groundwater sample analytical results are summarized in Table 3. Appendix A <br /> contains the complete laboratory analytical reports and chain-of-custody documentation. <br /> For screening purposes, the reported chemical concentrations are compared to <br /> California (2003, with updates) and US EPA (2003, with updates) maximum contaminant <br /> levels (MCLs) which have been established for public water systems to be generally <br /> protective of human health. Although MCLs are applicable to drinking water purveyors <br /> supplying water to the public, and not necessarily to groundwater, their use here is <br /> appropriate for preliminary screening and discussion purposes. <br /> • Bis(2-ethylhexyl)phthalate was reported in two grab groundwater samples, at <br /> concentrations of 390 micrograms per liter (µg/L) at SV-2 and 85 µg/l- at SV-3. <br /> Both reported concentrations are above the California MCL for bis(2-ethylhexyl) <br /> phthalate of 4 µg/L and the EPA MCL of 6 µg/L. <br /> • Naphthalene was not reported in any of the grab groundwater samples. <br /> Page 4 of 4 January 2006 <br />