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1 ' 15 October 2002 i AGE-NC Project No 96-0232 ' Page 6 of 19 ' frogs Potential nuisance conditions observed at R-2 Included trash In ditch(I e fast food containers, tire, paper and dry bush cuttings), no potential nuisance conditions were observed at R-1 ' Utilizing an ICM water analyzer and a YSI-50 dissolved oxygen meter In the field,dissolved oxygen was monitored at R-1 during the 29 July and 27 August monitoring events at concentrations of 6 53 mg/1 and 5 81 mg/l, respectively, EC values were recorded on the same days at 785 µmhos/cm and ' 642 µmhos/cm, respectively,pH values were recorded at 7 94 and 7 71,respectively, temperatures were measured at 26 8 °C and 26 4 °C, respectively ' Dissolved oxygen was monitored at R-2 during the 29 August,27 July and 05 September monitoring events at concentrations of 6 21 mg/l, 5 82 and 4 96 mg/l,respectively,EC values were recorded on the same days at 180µmhos/cm, 1,092 grnhos/cm and 516µmhos/cm,respectively,pH values were ' recorded at 7 18, 7 37 and 7 34, respectively, temperatures were measured at 26 6 °C, 27 0 °C and 22 8 'C Laboratory analysis of R-1 and R-2 grab water samples collected during the above monthly monitoring events reported turbidity values at concentrations between 0 4 and 2 8 nephelometric ' turbidity units (NTUs), a TDS value of 481 mg/1 was reported on 05 September 2002 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 1,485,238 gallons of MTBE-Impacted water were treated during the third quarter, a total volume of approximately 15,458,051 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 13 June and 29 July 2002 was equal to 689,487 gallons, which equates to a mass of 5,748,253 pounds of processed water Multiplying the average MTBE concentration (assumed to be 18 gg/l based on the average of the 13 June and the 29 July 2002 Influent grab water samples) by the pounds of extracted MTBE-Impacted ground water yields ' approximately 0 10 pounds of MTBE removed from MTBE-Impacted ground water during this period (Appendix D) ' The volume of extracted water between 29 July and 27 August 2002 was equal to 601,988 gallons, which equates to a mass of 5,018,774 pounds of processed water Multiplying the average MTBE concentration(assumed to be 13 4 µg/1 based on the average of the 29 July and the 27 August 2002 Influent grab water samples) by the pounds of extracted MTBE-Impacted ground water yields ' Advanced GeoEnvironmental,Inc