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i <br /> oc AM B R 9 A <br /> event A permanent GWE and treatment system now removes groundwater, treats it, and <br /> discharges it directly into the sewer system GWE system analytical data and GWE system mass <br /> removal data are presented in Table 2 and Table 3, respectively MTBE concentrations and mass <br /> removal from well RW-1A are depicted in Figure 3 Volume and mass removal data for vacuum <br /> truck operations and the 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 1287 2554 322,200 <br /> System <br /> Total (GWE) 520 926 944,849 <br /> The GWE system was not operating on January 9, 2002, when Blaine performed the first quarter <br /> 2002 groundwater monitoring event The system was down due to damaged power lines at the <br /> station, as noted in Table 3 Consequently, the contour map for this quarter (Figure 2) does not <br /> reflect the system's hydraulic influence that normally exists at the site <br /> ANTICIPATED SECOND OUARTER 2002 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-lA continue to contain the highest levels of hydrocarbons and MTBE Analytical data from <br /> offsite wells suggests the hydrocarbons and MTBE detected in onsite wells are remaining onsite <br /> Cambria recommends continued monitoring and sampling of site monitoring wells to evaluate <br /> concentration trends now that a groundwater extraction system is in operation, full time, at the <br /> site <br /> 0783 2 <br />