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Ol1A4T11,1,1,1 MOIJIT 11 REPORT <br />' 1 6131 Pacific Avenue Stockton California <br /> 4 2 Groundwater Sampling and Analysis <br /> On February 26, 1992, Emcon personnel collected groundwater samples from wells MW-1 <br /> and MW-2 Well MW-3 was not sampled due to the presence of floating liquid <br /> hydrocarbons All samples were collected according to the Emcon SP included in <br /> Appendix A The samples were delivered under chain-of-custody to NET Pacific, Inc , of <br /> Santa Rosa, California, a state-certified analytical laboratory, for analysis Water sample <br /> field data sheets are included as Appendix B The samples were analyzed for <br /> • TPH, as gasoline, by GC/FED Method 5030, <br /> • benzene, toluene, ethylbenzene, and total xylenes (BTEX) by EPA Method <br /> 8020, and, <br /> • total and fecal coliform by MMO/MUG <br /> The analytical reports and chain-of-custody form are included in Appendix C <br /> Concentrations of TPH, as gasoline, and benzene reported in Table 2 are also shown on <br /> Figure 5 <br /> Analysis of samples collected on February 26, 1992, indicated concentrations of TPH, as <br /> gasoline, of 0 43 and 17 ppm in MW-1 and MW-2, respectively Concentrations of <br /> benzene were 8 3 parts-per-billion (ppb) and 7,400 ppb in MW-1 and MW-2, respectively <br /> Both total and fecal coliform in both samples were reported at less than the reporting limit <br /> of 2 MPN/100 (most probable number of bacteria per one hundred milliliters of sample) <br /> I <br /> r <br /> r <br /> 90 020A OMR 3 <br /> I <br />