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I 15 January 2002 AGE-NC Project No 96-0232 ' Page 11 of 16 ' According to the fourth quarter 2001 update letter,the BFLP is in the process of obtaining an "out- of-agency" water service for the Rocky's Restaurant At this time, the San Joaquin County Public Works is reviewing engineering plans (prepared by Dillon&Murphy Engineering) for a permanent ' water connection to County Service Area No 31 The results of pump and treat ground water remediation between 01 October and 31 December 2001 ' are as follows • Approximately 2,043,809 gallons of MTBE-impacted ground water were continuously ' extracted from wells EW-4 and EW-5 and selectively extracted from wells EW-2, EW-6, EW-7, EW-8, EW-9 and EW-10, which are completed in the First Zone aquifer ' • A total volume of approximately 9,303,630 gallons of MTBE-impacted water has been treated at the site since the start-up period in November 2000 ' • Dissolved MTBE was detected(utilizing EPA Method 8260M) in water samples collected from the extraction wells at concentrations between 2 3 and 53 ,ug/l, the greatest MTBE- impacted water was collected from extraction well EW-4 near the southwest corner of the liesite • Dissolved MTBE was detected from grab samples collected at the influent-end of the treatment system at concentrations between 20 and 23 µg11 • Laboratory analysis of three grab water samples collected at the effluent-end of the pump and treat system did not detect any constituents of concern ' fl Between 06 September and 15 October 2001, the mass of MTBE-impacted ground water processed during operation of the pump and treat system was calculated to be 8,220,499 ' pounds Multiplying the average MTBE concentration (15 4g/1) by the pounds of MTBE- extracted water yielded a mass of approximately 0 12 pounds of MTBE removed from the extracted ground water(Table 8, Appendix D) ' Between 15 October and 07 November 2001, the mass of MTBE-impacted ground water processed during operation of the pump and treat system was calculated to be 3,976,449 pounds Multiplying the average MTBE concentration (21 5 µg/1)by the pounds of MTBE- extracted water yielded a mass of approximately 0 08 pounds of MTBE removed from extracted ground water(Table 8, Appendix D) ' Between 07 November and 12 December 2001, the mass of MTBE-impacted ground water processed during operation of the pump and treat system was calculated to be 6,437,298 pounds Multiplying the average MTBE concentration (20 µg11) by the pounds of MTBE- extracted water yielded a mass of approximately 0 13 pounds of MTBE removed from extracted ground water(Appendix D) Advanced GeoEnviroumental,Inc I