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•CAMBRfA removal data are presented in Table 2 and Table 3, respectively MTBE concentrations and mass removal from well RW-lA are depicted in Figure 3 Volume and mass removal data for vacuum truck operations and the permanent GWE system are summanzed in the table below Mass TPHg Mass MTBE Volume Removed (pounds) Removed (pounds) Groundwater Removed (gallons) Vacuum Truck 397 671 622,649 Operations Permanent GWE 416 579 1,051,389 System Total (GWE) 813 1250 1,674,038 ANTICIPATED FIRST QUARTER 2003 ACTIVITIES Blaine will gauge and sample the site wells according to the established sampling schedule and tabulate the data Cambria will prepare a groundwater monitoring report . CONCLUSIONS AND RECOMMENDATIONS The petroleum hydrocarbon and MTBE concentrations in groundwater samples collected from the shallow wells this quarter are within the historical norm for this site Wells MW-5, MW-8 and RW-1A continue to contain the highest levels of hydrocarbons and MTBE Analytical data from offsite wells suggests the hydrocarbons and MTBE detected in onsite wells are remaining onsite Cambria recommends continued monitoring and sampling of site monitoring wells to ev"luat- Z concentration trends now that a groundwater extraction system is in operation, ful e, at the O site m Analytical Reduction Recommendation Cambria recommends reducing TPHg and BTEX analysis for wells MW-2, MW-3, MW4, MW-6, MW-7, MW-9, MW-10, and MW-1 I to annual, and continuing to analyze for MTBE on a quarterly basis in these wells These wells have historically contained little or no TPHg and BTEX The one exception to this is well MW-2, but the recent history of this well shows that it has not contained TPHg or BTEX for the last 11 quarters We believe that annual monitoring will be sufficient to monitor TPHg and BTEX in these wells We will implement this analytical change once we have received approval for the change from San Joaquin County Environmental Health Department 0783 2