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igm <br /> s _ =0-:7 <br /> r'. <br /> __I--M*M%I- <br /> x <br /> i <br /> PROBLEM ASSESSMENT REPORT <br /> Moore Petrolem, Inc. <br /> 5941 F Street, Banta, CA <br /> NGA Project No. 10-90.481 <br /> Paye 8 <br /> �.6 grQUnd-Water Analytical Results <br /> Following the installation and development of monitoring wells Mw- <br /> 4, MW-5, and MW-6 all monitoring wells at the site were sampled on <br /> July 6, 1990. Samples were analyzed for BTEX, EDC, EDB, and TPH <br /> by a California-certified laboratory. Results of all ground-water <br /> sampling at the site are summarized in Table 5. Laboratory <br /> analytical reports are presented in Appendix B. <br /> Examination of Table 5 indicates that concentrations of petroleum <br /> constituents at MW-2, NW-3, NW-4, are low, with concentrations <br /> never exceeding maximum contaminant levels (mcls) for BTEX. No <br /> petroleum constituents were detected at MW-6. Concentrations of <br /> benzene excoed mcla at monitoring wells MW-1 and NW-5, but appear <br /> to have fallen appreciably at NW-1 since the first sampling event <br /> in August, 1988. <br /> TABLE 5 <br /> Ground-Water Analytical Results <br /> sample Ethyl- <br /> ID pi g Benzene Toluene Benzene Xylenes FDD EDB TPH <br /> ::1-1 08-22-88 NE" .: NF NF 11.0 7.30 NF 930.0 <br /> 05-12-89 130.0 30.0 90.0 . 90.0 NF NF <500.0 <br /> 06-27-89 150.0 NF 72.0 30.0 NF NF 600.0 <br /> 07-06-90 11.0NF 3.4 1.6 NF . NF 410.0 <br /> MW-2 05-12-89 0.5 NF NF 2.0 NF NF <100.0 <br /> 07-06-90 0.9 NF NF 1.3 NF NF 65.0 <br /> MW-3 05-12-89 0.3 NF NF 2.0 NF NF <100.0 <br /> 07-06-90 1.0 NF NF NF NF NF NF <br /> MW-4 07-06-90 0.9 NF NF NF NF NF NF <br /> NW-5 07-06-90 7.6' NF 5.8 1.7 NF NF . 160.0 <br /> - (dup) 07-06-90 7.0 NF 5.9 1.7 NF NF 150.0 <br /> MW-6 07-06-90 NF NF NF NF NF NF NF <br /> NOTES: all values in ppb <br /> NF = Not Found <br /> TPH = Total Purgeable Petroleum Hydrocarbons <br /> EDC = 1,2-Dichloroethane <br /> EDB = Ethylene Dibromide <br />