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i � AMBRIA <br /> (BTEX), and methyl tertiary butyl ether (MTBE) by EPA Method 8020 Groundwater <br /> samples from wells MW-5, MW-8, RW-]A, the CalTrans well, and the domestic wells were <br /> also analyzed for fuel oxygenates (ethanol, TBA, MTBE, ETBE, DIPS, and TAME) by EPA <br /> Method 8260A Groundwater samples from wells MW-5, MW-8, and RW-IA were also <br /> analyzed for methanol by EPA 8015 (Modified) <br /> Field monitoring data and chemical analytical data are presented in a summary table in <br /> Blaine's groundwater monitoring report (Appendix A) Additional analytical data are <br /> summarized on Table 1 <br /> Conclusions and Recommendations <br /> The petroleum hydrocarbon and MTBE concentrations in groundwater samples collected <br /> from the shallow wells this quarter are within the historical norm for this site Wells MW-5, <br /> MW-8, and RW-1A continue to contain the highest levels of hydrocarbons and MTBE <br /> However, analytical data from offsite wells suggests the hydrocarbons and MTBE detected <br /> onsite wells (MW-5, MW-8, and RW-1A) are remaining onsite <br /> Groundwater samples from the CalTrans irrigation well and the private water wells did not <br /> contain TPHg, benzene, or fuel oxygenates this quarter We will continue quarterly <br /> groundwater sampling and analysis to confirm the presence or absence of MTBE to these <br /> wells <br /> Cambria will continue to monitor groundwater analytical data from the monitoring wells at <br /> this site to determine if additional plume delineation is necessary If additional investigative <br /> work is warranted in the future, we will make recommendations for this work <br /> 0783 3 <br />