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n r First Quarter 1997 Groundwater Monitoring Report • Moore Petroleum, 14800 W Frontage Rd,Manteca,CA March 27, 1997 Page 3 well were analyzed for 1,2 Dichloroethane (DCE)by EPA Method 601 Groundwater samples collected from monitoring wells MW-1 through MW-4 and DM-2 were analyzed for TPH, as diesel, by EPA Method 8015 Modified The groundwater samples collected from MW-1 was analyzed for methyl-tert-butyl-ether(MTBE)by EPA Method 8020 On February 19, 1997, a split sample taken from the station's domestic well (DM-1)was also submitted, under cham-of-custody, to Sequoia Analytical of Sacramento, California, a state- certified analytical laboratory The split sample was analyzed for 1,2 Dichloroethane (DCE)by EPA Method 601 The results of this sampling event is summarized in Table 2 The most recent laboratory analytical reports and chain-of-custody forms are included in Appendix B RECOMMENDATIONS Apex recommends one more quarter of groundwater monitoring at the subject site The groundwater samples from the nine monitoring wells(MW-1 through MW-9) and the two domestic wells(DM-1 and DM-2) will be analyzed for total petroleum hydrocarbons(TPH), as gasoline, • benzene, toluene, ethylbenzene and total xylenes(BTEX)by EPA Method 8020/8015 Groundwater samples collected from monitoring wells MW-1 through MW-5 and the two domestic wells will be analyzed for 1,2 Dichloroethane (DCE)by EPA Method 601 Groundwater samples collected from monitoring wells MW-1 through MW-4 and the two domestic wells will be analyzed for TPH, as diesel, by EPA Method 8015 Modified The groundwater sample collected from MW- 1 will be analyzed for methyl-tert-butyl-ether(MTBE)by EPA Method 8020 Following the next groundwater monitoring event, a closure request will be submitted to San Joaquin County Environmental Health Division following Appendix B of the Tn-Regional Guidelines