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.,, nc113 1rlvry anu AW-IAat concentrations of 3,020 and 2,370 ppb, respectively. <br /> These data are shown o e chemical concentration map (Figure..Oand are summarized <br /> in 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-IA this quarter. <br /> • From March through June 1999, weekly groundwater extraction (GWE) was performed <br /> on well RWAA. 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 RWAA. 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 in 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 /> n7•I <br />