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i <br /> " QUARTERLY GROUNDWATER MONrMRFNG REPORT <br /> 5131 Pacific Avenue Stockton California <br /> 4 2 Groundwater Sampling and Analysis <br /> On May 12, 1992, Emcon personnel collected groundwater samples from wells MW-1 and <br /> MW-2 -w s no saam ed--due to-the re nce � fi s <br /> All samples were collected according to the Emcon SP included in Appendix A The <br /> samples were delivered under chain-of-custody to Sequoia Analytical of Sacramento, <br /> California, a state-certified analytical laboratory, for analysis The samples were analyzed <br /> for <br /> • TPH, as gasoline, by EPA Method 8015, <br /> • benzene, toluene, ethylbenzene, and total xylenes (BTEX) by EPA Method <br /> 8020, and, <br /> • total and fecal coliform by SM 909C <br /> The analytical reports and chain-of-custody form are included in Appendix B <br /> I Concentrations of benzene reported in Table 2 are also shown on Figure 5 <br /> I Analysis of samples collected on May 12, 1992, indicated concentrations of benzene were <br /> 5 0 parts-per-billion (ppb) and 26 ppb in MW-1 and MW-2, respectively <br /> I <br /> 1 <br /> 90-0206 OMR 3 <br />