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' 13 July 2001 • AGE-NC Project No 96-0232 ' Page 6of15 ' mg/l and 3 58 mg/1, respectively, EC values on the same days were at 948 ymhos/cm, 1,030 µmhos/cm and 910 umhos/cm,respectively, pH values were detected on the same days at 7 04, 7 16 and 7 24, respectively, temperatures were observed on the same days at 18 1 °C, 21 4 °C ' and 33 4 °C Laboratory analysis of R-2 grab water samples collected on 09 April, 03 May and 04 June 2001 ' reported turbidity values at 0 2 NTUs, 6 2 NTUs and 13 NTUs, laboratory analysis of R-2 reported TDS values of 620 mg/L, 610 mg/L and 540 mg/L, respectively Analytical results of are summarized in Table 2, field measurements and laboratory reports are in Appendix A and Appendix ' C, respectively ' 2 8 MASS-VOLUME REMOVAL CALCULATIONS ' Based on effluent flow meter observations (Appendix A), approximately 2,395,645 gallons of MTBE-impacted water were treated during the second quarter 2001, a total volume of approximately 5,875,416 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 08 March and 09 April 2001 was equal to 836,907 gallons, which equates to a mass of 6,977,294 pounds of water Multiplying the average MTBE concentration (assumed to be 100 5 µg/l based on 08 March and 09 April 2001 influent grab water samples)by the pounds of extracted MTBE-impacted ground water yields approximately 0 70 pounds of MTBE removed from MTBE-impacted ground water between 08 March and 09 April 2001 (Appendix D) The volume of extracted water between 09 April and 03 May 2001 was equal to 543,352 gallons, Iwhich equates to a mass of 4,529,926 pounds of water Multiplying the average MTBE concentration (assumed to be 120µg/l based on 09 April and 03 May 2001 influent grab water samples) by the pounds of extracted MTBE-impacted ground water yields approximately 0 54 pounds of MTBE removed from MTBE-impacted ground water between 09 April and 03 May 2001 (Appendix D) The volume of extracted water between 03 May and 04 June 2001 was equal to 866,753 gallons, which equates to a mass of 7,226,120 pounds of water Multiplying the average MTBE concentration (assumed to be 91 ug/1 based on 03 May and 04 June 2001 influent grab water samples) by the pounds of extracted MTBE-impacted ground water yields approximately 0 66 pounds of MTBE removed from MTBE-impacted ground water between 03 May and 04 June 2001(Appendix D) The volume of extracted water between 04 June and 02 July 2001 was equal to 747,592 gallons, which equates to a mass of 6,232,675 pounds of water Multiplying the average MTBE concentration (assumed to be 35 Acg/l based on 04 June and 02 July 2001 influent grab water samples) by the Advanced GeoEnvironmental,Inc