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' 11 August 2003 S AGE-NC Project No 96-0232 ' Page 6 of 15 ' The volume of extracted water between 25 March and 21 April 2003 was equal to 701,055 gallons, which equates to a mass of 5,844,696 pounds of processed water Multiplying the average MTBE concentration(assumed to be 66 µg/l based on the average of the March and April 2003 influent grab ' water samples) by the pounds of extracted MTBE-impacted ground water yields approximately 0 39 pounds of MTBE removed from MTBE-impacted ground water during this period (Appendix D) ' The volume of extracted water between 21 Apnl and 14 May 2003 was equal to 245,406 gallons, which equates to a mass of 2,045,950 pounds of processed water Multiplying the average MTBE ' concentration(assumed to be 43 µg/1 based on the average of the April and May 2003 influent grab water samples) by the pounds of extracted MTBE-impacted ground water yields approximately 0 09 pounds of MTBE removed from MTBE-impacted ground water during this period ' (Appendix D) The volume of extracted water between 14 May and 25 June 2003 was equal to 1.144,208 gallons, ' which equates to a mass of 9,539,262 pounds of processed water Multiplying the average MTBE concentration(assumed to be 27 µg/1 based on the average of the May and June 2003 influent grab water samples) by the pounds of extracted MTBE-impacted ground water yields approximately ' • 0 26 pounds of MTBE removed from MTBE-impacted ground water during this period (Appendix D) fDuring the second quarter 2003, an estimated 0 74 pounds of MTBE was extracted from ground water,to date,the ground water treatment system has removed a total of approximately 12 16 pounds ' of MTBE from extracted ground water (Table 8) Second quarter 2003 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 waterpump 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 24 through 27 June 2003, ground water monitoring and sampling were performed at 35 ground water monitoring wells (MW-1 through MW-18) and at ten ground water extraction wells (EW-1 through EW-10), in addition, grab water samples were collected from two San Joaquin County service area No 31 municipal water wells (CSA-1 and CSA-2) on 27 June 2003 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 San Joaquin County Environmental Health Department (SJCEHD) by letter dated 24 February 1998 As-built monitoring well construction details are summarized in Table 9 Advanced GeoEnvironmentai,Inc I