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09 May 2002 AGE-NC Project No 96-0232 Page 7 of 18 3 7 MASS-VOLUME REMOVAL CALCULATIONS Based on effluent flow meter observations(Appendix B,Table 8),approximately 3,054,581 gallons of MTBE-Impacted water were treated during the first quarter 2002,a total volume of approximately 12,897,113 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 12 December 2001 and 03 January 2002 was equal to 538,902 gallons, which equates to a mass of 4,492,826 pounds of water Multiplying the average MTBE concentration (assumed to be 30 5 µg/1 based on 12 December 2001 and 03 January 2002 Influent grab water samples) by the pounds of extracted MTBE-Impacted ground water yields approximately 0 13 pounds of MTBE removed from MTBE-Impacted ground water between 12 December and 03 January 2002 The volume of extracted water between 03 January and 04 February 2002 was equal to 842,673 gallons, which equates to a mass of 7,025,365 pounds of water Multiplying the average MTBE concentration(assumed to be 35 µg/1 based on 03 January and 04 February 2002 influent grab water . samples) by the pounds of extracted MTBE-Impacted ground water yields approximately 0 25 pounds ofMTBE removed from MTBE-Impacted groundwater between 03 January and 04 February 2002 The volume of extracted water between 04 February and 27 March 2002 was equal to 2,211,908 gallons, which equates to a mass of 18,440,677 pounds of water Multiplying the average MTBE concentration(assumed to be 20 5 µg/1 based on 04 February and 27 March 2002 Influent grab water sample)by the pounds of extracted MTBE-Impacted ground water yields approximately 0 37 pounds of MTBE removed from MTBE-Impacted ground water between 04 February and 27 March 2002 During the first quarter 2002, an estimated 0 75 pounds of MTBE was extracted from ground water, to date, the ground water treatment system has removed a total of approximately 10 03 pounds of MTBE from extracted ground water (Table 8) First quarter 2002 mass-volume calculations of MTBE-Impacted ground water extracted from the ground water pump-and-treat system are presented In Appendix E Plots of cumulative ground water pump and treat mass removal trends and Influent ground water MTBE concentrations versus time are In Appendix F 4 0. QUARTERLY GROUND WATER MONITORING AND SAMPLING EVENT On 26, 27 & 28 March 2002, ground water monitoring and sampling were performed at 30 ground water monitoring wells (MW-1 through MW-13D), at nine ground water extraction wells (EW-2 • through EW-10),one domestic drinking water well located at 14749 Thornton Road(DW-1)and two Advanced 6eoEnvironmental,Inc