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i ' 09 May 2003 AGE-NC Project No 96-0232 ' Page 6 of 16 ' 2 7 MASS-VOLUME REMOVAL CALCULATIONS Based on effluent flow meter observations(Appendix A,Table 8),approximately 2,871,250 gallons ' of MTBE-unpacted water were treated during the first quarter 2003,a total volume of approximately 19,499,136 gallons of MTBE-impacted water has been treated at the site since the start-up period in November 2000 ' The volume of extracted water between 05 December 2002 and 27 January was 2003 equal to 4 1,224,920 gallons, which equates to a mass of 10,212,158 pounds of processed water Multiplying ' the average MTBE concentration(assumed to be 21 pg/1 based on the average of the 05 December 2002 and the 27 January 2003 influent grab water samples) by the pounds of extracted MTBE- impacted ground water yields approximately 0 21 pounds ofMTBE removed from MTBE-impacted ' ground water during this period (Appendix D) The volume of extracted water between 27 January and 24 February 2003 was equal to 798,190 ' gallons,which equates to a mass of 6,654,510 pounds of processed water Multiplying the average MTBE concentration (assumed to be 31 µg/1 based on the average of the 27 January and the 24 February 2003 influent grab water samples)by the pounds of extracted MTBE-impacted ground 10 water yields approximately 0 21 pounds of MTBE removed from MTBE-impacted ground water during this period (Appendix D) The volume of extracted water between 24 February and 25 March 2003 was equal to 848,140 gallons, which equates to a mass of 7,070,943 pounds of processed water Multiplying the average MTBE concentration (assumed to be 62 µg/1 based on the average of the 24 February and the 25 March 2003 influent grab water samples) by the pounds of extracted MTBE-impacted ground water yields approximately 0 44 pounds of MTBE removed from MTBE-impacted ground water Iduring this period (Appendix D) During the first quarter 2003,an estimated 0 86 pounds of MTBE was extracted from ground water, to date, the ground water treatment system has removed a total of approximately 1142 pounds of MTBE from extracted ground water (Table 8) First 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 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 24 and 25 March 2003, ground water monitoring and sampling were performed at 35 ground water monitoring wells (MW-1 through MW-18) and at nine ground water extraction wells(EW-1 F through EW-4 and EW-6 through EW-10),in addition,grab water samples were collected from two If Advanced GeoEnvironmentai,inc