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CAM BR [ A <br /> and benzene were not detected in any of the other shallow monitoring wells Methanol <br /> was not detected in any of the wells analyzed MTBE was reported by EPA Method 8020 <br /> in wells MW-2 through MW-8 and RW-IA at concentrations ranging from 2 97 to <br /> 124,000 ppb The MTBE result for RW-IA was generated out of hold time MTBE was <br /> detected by EPA Method 8260A in groundwater samples collected from wells MW-5, <br /> MW-8, and RW-IA at concentrations ranging from 3,380 to 139,000 ppb TAME was <br /> detected in wells MW-5, MW-8, and RW-IA at concentrations ranging from 47 1 to <br /> 3,110 ppb TBA was detected to wells MW-5 and MW-8 at concentrations of 28,200 and <br /> 2,620 ppb, respectively The benzene and MTBE data are shown on the chemical <br /> concentration map (Figure 2), historical TPHg, BTEX, and MTBE date 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 RW-IA Beginning in July 1999, GWE occurred 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 May 22, 2000, approximately <br /> 168,255 gallons of water have been removed from RW-IA As shown on Table 2, based <br /> on the concentration data, groundwater extraction has effectively removed <br /> approximately 223 pounds of TPHg, 14 5 pounds of benzene, and 247 pounds of MTBE <br /> • Groundwater samples collected from deep monitoring wells MW-12 through MW-14 did <br /> not contain detectable concentrations of TPHg or MTBE Benzene was detected in well <br /> MW-12 at a concentration of 1 28 ppb Well MW-13 results reported were generated <br /> out of hold time <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) and also on Table 1 <br /> Quarterly Sampling <br /> Groundwater samples from all wells were analyzed for total purgeable hydrocarbons as <br /> gasoline (TPHg) by EPA Method 8015 (Modified), benzene, toluene, ethylbenzene, xylenes <br /> 0783 2 <br />