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i J <br /> CAMBRIA <br /> TPHg and benzene were not detected in any of the other shallow monitoring wells <br /> Methanol was detected in well MW-8 at a concentration of 28,900 ppb, but not in wells <br /> MW-5 and RW-IA Groundwater samples collected from wells MW-5, MW-8, and <br /> RW-IA contained MTBE (by EPA Method 8260A) at concentrations ranging from <br /> 8,140 to 143,000 ppb Wells MW-2, MW-4, and MW-6 contained MTBE (by EPA <br /> Method 8020) at concentrations ranging from 14 5 to 3,390 ppb TAME was detected <br /> in wells MW-5 and RW-IA at concentrations of 3,020 and 2,370 ppb, respectively <br /> These data are shown on the chemical concentration map (Figure 2) and are summarized <br /> to the table in Blaine's monitoring report (Appendix A) Additional analytical data are <br /> summarized in Table 1 <br /> • Separate phase petroleum hydrocarbons were not present in well RW-1A this quarter <br /> • From March through June 1999, weekly groundwater extraction (GWE) was performed <br /> on well RW-IA Beginning in July 1999, GWE occurs bi-weekly During each GWE <br /> event, approximately 5,000 gallons of water is purged by a vacuum truck and transported <br /> to the Martinez Refining Company for recycling As of January 31, 2000, <br /> approximately 128,151 gallons of water have been removed from RW-lA These data <br /> are presented on Table 2 <br /> • Groundwater samples collected from deep monitoring wells MW-12 through MW-14 did <br /> not contain detectable concentrations of TPHg, benzene, MTBE, or other fuel <br /> oxygenates <br /> • TPHg, benzene, MTBE, and fuel oxygenates were not detected in the groundwater <br /> samples collected from the CalTrans irrigation well nor in any of the domestic wells The <br /> laboratory analytical results are summarized to the table in Blaine's monitoring report <br /> (Appendix A) Additional analytical data are summarized on Table 1 <br /> Quarterly Sampling <br /> Groundwater samples from all wells were analyzed for total purgeable hydrocarbons as <br /> gasoline (TPHg) according to EPA Method 8015 (Modified), benzene, toluene, ethylbenzene, <br /> xylenes (BTEX), and methyl tertiary butyl ether (MTBE) according to EPA Method 8020 <br /> Groundwater samples from wells MW-5, MW-8, RW-IA, the CalTrans well, and the domestic <br /> wells were also analyzed for methanol according to EPA Method 8015 (Modified), and fuel <br /> . oxygenates (ethanol, TBA, MTBE, ETBE, DIPE, and TAME) by EPA Method 8260A <br /> 0783 2 <br />