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J 30 July 2004 AGE-NC Project No 96-0232 Page 6 of 16 Utilizing an ICM water analyzer and a YSI-50 dissolved oxygen meter in the field,dissolved oxygen was monitored at R-2 on the above dates at concentrations between 4 31 mg/1 and 4 92 mg/l, and from R-I at 4 59 mg/1 EC values were recorded on the same days from R-2 between 168 µmhos/cm and 919 µmhos/cm and pH values between 7 23.and 7 41, and from R-1 at 60 mhos/cm and 7 35, _ - respectively Temperatures were measured from R-2 between 20 8 °C and 26 3 °C, and from R-1 at286 °C Laboratory analysis of R-2 grab water samples collected during the above monthly monitoring events reported turbidity values at concentrations between 0 3 and 10 nephelometric turbidity units(NTUs), and from R-1 at 2 7 NTU TDS values of 35 mg/l and 120 mg/1 were reported on 15 June 2003 from R-1 and R-2, respectively 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 1,212,292 gallons of MTBE-impacted water were treated during the second quarter 2004, a total volume of approximately 26,200,733 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 16 March 2004 and 14 April 2004 was equal to 483,301 gallons, which equates to a volume of 1,831,710 liters of processed water Multiplying the average MTBE concentration(assumed to be 17 gg/l based on the average of the March 2004 and the April 2004 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) The volume of extracted water between 14 April 2004 and 13 May 2004 was equal to 325,352 gallons, which equates to a volume of 1,233,842 liters of processed water Multiplying the average MTBE concentration(assumed to be 17 5 µg/1 based on the average,of the April 2004 and the May 2004 influent grab water samples)by the pounds of extracted MTBE-impacted ground water yields approximately 0 05 pounds of MTBE removed from MTBE-impacted ground water during this period(Appendix D) The volume of extracted water between 13 May 2004 and 15 June 2004 was equal to 403,439 gallons,which equates to a volume of 1,529,033 liters of processed water Multiplying the average MTBE concentration (assumed to be 17 gg/l based on the average of the May 2004 and the June 2004 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) Advanced GeoEnv roamental,Inc