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d Third Quarter 1997 Groundwater Monitoring Report F✓ Moore Petroleum,Inc.,5491 "F",Street,Banta,CA September 17, 1997 Page 3 groundwater samples from monitoring wells MW-1 through MW-6 in accordance to the Apex SOP included as Appendix A. The samples were submitted, under chain-of-custody documentation, to Sparger Technology of Sacramento, California, a state-certified analytical laboratory. The groundwater monitoring well samples were analyzed for the following: 1) TPH, as gasoline and diesel, by Modified EPA Method 8015; 2) benzene, toluene, ethylbenzene, and total xylenes (BTEX), by EPA Method 8020; and 3) methanol, ethanol, tertiary butanol, methyl- tert-butyl-ether (MTBE), di-isopropyl ether (DIPS), ethyl tertiary butyl ether(ETBE), and tertiary amyl methyl ether (TAME), by EPA Method 8260. Analytical results of TPH as gasoline and diesel, and BTEX are summarized in Table 2. Analytical results of MTBE, DIPE, ETBE, and TAME (oxygenates) did not identify these constituents above the laboratory detection limit. The laboratory analytical reports and chain-of-custody form are included in Appendix B. Based on the decrease of petroleum hydrocarbon concentrations from natural attenuation and remedial operations, Apex proposes that groundwater monitoring wells MW-1 and MW-4 be the only wells sampled during the next three quarters. In addition, since the above-mentioned oxygenates were not detected above the laboratory detection limit during the July 29, 1997 sampling event, future sample analysis for these constituents will not be conducted. REPORT DISTRIBUTION { Apex submitted copies of this report, in final form, to: 1. Ms. E. Thayer Central Valley Regional Water Control Board 3443 Routier Road, Suite 'A' Sacramento, California 95827-3098 f a i I w J1 9 C:KBPROJ-t1ERA021ERA02,0041QMR_0897.WPD