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30 January 2004 AGE-NC Project No 96-0232 Page 6 of 15 Laboratory analysis ofR-2 grab water samples collected during the above monthlymomtormg events reported turbidity values at concentrations between 0 1 and 3 7 nephelometric turbidity units (NTUs), a TDS value of 571 mg/1 was reported on 09 December 2003 Analytical results are summarized In Table 2, field measurements and laboratory reports are in Appendix C 2 7 MASS-VOLUME REMOVAL CALCULATIONS Based on effluent flow meter observations(Appendix A,Table 8),approximately 1,109,431 gallons of MTBE-impacted water were treated during the fourth quarter 2003, a total volurne of approximately 23,535,076 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 15 September and 06 November 2003 was equal to 520,191 gallons, which equates to a mass of 4,336,832 pounds of processed water Multiplying the average MTBE concentration (assumed to be 24 5 µg/1 based on the average of the September and the November 2003 influent grab water samples) by the pounds of extracted MTBE-impacted ground water yields approximately 0 11 pounds of MTBE removed from MTBE-impacted ground water during this period(Appendix D) The volume of extracted water between 06 November and 19 November 2003 was equal to 231,641 gallons,which equates to amass of 1,931,191 pounds of processed water Multiplying the average MTBE concentration (assumed to be 29 �ig/l based on the average of the 06 November and the 19 November 2003 influent grab water samples)by the pounds of extracted MTBE-impacted ground water yields approximately 0 06 pounds of MTBE removed from MTBE-impacted ground water during this period (Appendix D) The volume of extracted water between 19 November and 09 December 2003 was equal to 171,423 gallons,which equates to a mass of 1,429,154 pounds of processed water Multiplying the average MTBE concentration (assumed to be 23 5 gg/1 based on the average of the November and the December 2003 Influent grab water samples) by the pounds of extracted MTBE-impacted ground water yields approximately 0 07 pounds of MTBE removed from MTBE-impacted ground water during this period (Appendix D) During the fourth quarter 2003, an estimated 0 24 pounds of MTBE was extracted from ground water,to date,the groundwater treatment system has removed a total of approximately 12 53 pounds of MTBE from extracted ground water(Table 8) Fourth 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 Advanced GeoEnwronmental,Inc