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I15 October 2002 AGE-NC Project No 96-0232 IPage 7of19 I approximately 0 07 pounds of MTBE removed from MTBE-impacted ground water during this period(Appendix D) I The volume of extracted water between 27 August and 05 September 2002 was equal to 193,763 gallons, which equates to a mass of 1,615,402 pounds of processed water Multiplying the average MTBE concentration (assumed to be 9 4 gg/l based on the average of the 27 August and the 05 I September 2002 influent grab water samples) by the pounds of extracted MTBE-Impacted ground water yields approximately 0 02 pounds of MTBE removed from MTBE-Impacted ground water during this period (Appendix D) During the third quarter, an estimated 0 19 pounds of MTBE was extracted from ground water, to date, the ground water treatment system has removed a total of approximately 10 44 pounds of MTBE from extracted ground water(Table 8) Third quarter mass-volume calculations of MTBE- Impacted ground water extracted from the ground water pump-and-treat system are presented in Appendix D Plots of cumulative ground water pump and treat mass removal trends and Influent ground water MTBE concentrations versus time are in Appendix E 3.0. GROUND WATER MONITORING AND SAMPLING On 04, 05 and 06 September 2002, ground water monitoring and sampling were performed at 26 ground water monitoring wells (MW-1 through MW-13D), at ten ground water extraction wells (EW-1 through EW-10) and two San Joaquin County service area No 31 municipal water wells (CSA-1 and CSA-2) Ground water monitoring wells MW-10A, MW-12A and MW-13A were not sampled due to "dry" screen Intervals, ground water monitoring well MW-10B was not sampled because the sampling tube could not be inserted beyond 15 feet bsg Quarterly ground water monitoring procedures for the site were outlined in the AGE-prepared Work Plan Addendum, dated 28 January 1998, and approved by the SJCEHD by letter dated 24 February 1998 As-built monitoring well construction details are summarized In Table 9 IA coordinated effort was made with Three B's Truck Plaza (14749 Thornton Road, Lodi CA) to conduct ground water monitoring activities concurrently,the Three B's Truck Plaza tabulated ground water elevation results are In Appendix F 3 1 WELL MONITORING AND PURGE PROCEDURES On 04 September 2002, the depth to ground water was measured at each monitoring well from the top of each well casing to the nearest 0 01-foot utilizing a Solinst water level meter The ground . water elevation in each monitoring well was calculated by subtracting the measured depth to ground IAdvanced GeoEnvironrnental,Inc