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CAMBRIA <br /> i <br /> On June 20, 2001, a permanent GWE and treatment system began removing groundwater, <br /> treating it, and discharging it directly into the sanitary sewer system GWE system analytical <br /> data and GWE system mass removal data are presented in Table 1 and Table 2, respectively <br /> Methyl tertiary butyl ether (MTBE) concentrations and mass removal from well RW-lA are <br /> depicted in Figure 3 Volume and mass removal data for vacuum truck operations and the <br /> permanent GWE system are summarized in the table below <br /> Mass TPHg Mass MTBE Volume <br /> Removed (pounds) Removed (pounds) Groundwater <br /> Removed(gallons) <br /> Vacuum Truck 397 671 622,649 <br /> Operations <br /> Permanent GWE 610 752 2,189,660 <br /> System <br /> Total (GWE) 1007 1423 2,812,309 <br /> According to the City of Stockton's October 10, 2003 letter, discharge linuts for fuel oxygenates <br /> at non-detect levels now apply to our GWE system effluent Cambria received this letter on <br /> October 14, 2003, and immediately shut the GWE system down, pending an evaluation of <br /> appropriate design changes to our treatment system in order to address these new discharge <br /> limitations The GWE system was restarted on June 8, pumping into an above-ground storage <br /> tank onsite GWE system effluent samples were collected on June 11, 2004 to verify permit <br /> compliance Discharge to the sanitary sewer resumed on June 23, 2004, after notifying the City <br /> of Stockton of the analytical results Cambria will continue to evaluate concentration trends at <br /> the site <br /> ANTICIPATED THIRD QUARTER 2004 ACTIVITIES <br /> Blaine will gauge and sample the site wells according to the established sampling schedule and <br /> tabulate the data Cambria will prepare a groundwater monitoring report <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The petroleum hydrocarbon and MTBE concentrations in groundwater samples collected from <br /> the shallow wells this quarter are within the historical norm for this site Wells MW-5 and <br /> RW-1A continue to contain the highest levels of hydrocarbons and MTBE, however it appears <br /> that GWE efforts have reduced MTBE and benzene concentrations in the vicinity of these wells <br /> 0783 2 <br />