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I • Ce4MB R IA monitoring wells Methanol was not detected in any of the wells analyzed MTBE was reported by EPA Method 8020 in wells MW-2, MW-4 through MW-8, and RW-1A at concentrations ranging from 25 8 to 133,000 ppb MTBE was detected by EPA Method 8260A in groundwater samples collected from wells MW-5, MW-8, and RW-IA at concentrations ranging from 259 to 152,000 ppb, however the results were generated out of hold time In MW-8 the value that was detected for MTBE by EPA Method 8260A is only an estimated value because of coelution with another analyte The benzene and MTBE data are shown on the chemical concentration map (Figure 2), historical TPHg, BTEX, and MTBE date are summarized in the table in Blaine's monitoring report (Appendix A) Additional analytical data are summarized in Table 1 ® Separate phase petroleum hydrocarbons were not present in well RW-1 A this quarter o Groundwater samples collected from deep monitoring wells MW-12 through MW-14 did not contain detectable concentrations of TPHg, benzene, or MTBE ® TPHg, benzene, MTBE, and fuel oxygenates were not detected in the groundwater . samples collected from the CalTrans irrigation well nor to any of the domestic wells except for the Foster well and the Sanella well MTBE in the Foster well was reported at a concentration of 15 0 ppb MTBE by EPA Method 8020, and detected at a concentration of 12 6 ppb by EPA Method 8260 TPHg was detected in the Sanella well at a concentration of 1,370 ppb The Sanella well was previously referred to as the Warman well, but the property has been sold by the Warmans to the Sanellas The laboratory analytical results are summarized in the table in Blaine's monitoring report (Appendix A) and also on Table 1 o From March through June 1999, weekly groundwater extraction (GWE) was performed on well RW-IA Beginning in July 1999, GWE occurred bi-monthly During each GWE event, approximately 5,000 gallons of water is purged by a vacuum truck and transported to the Martinez Refining Company for recycling As of August 22, 2000, approximately 193,455 gallons of water have been removed from RW-lA As shown on Table 2, based on the concentration data, groundwater extraction has effectively removed approximately 235 pounds of TPHg, 17 5 pounds of benzene, and 277 pounds of MTBE On August 22, 2000 a pump was installed to RW-lA and it currently pumps into a Baker tank A vacuum truck then empties this tank as previously described above 0783 2