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15 July 2002 AGE -NC Project No 96-0232 Page 6 of 21 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 22 May and 13 June monitoring events at concentrations of 7 71 mg/1 and 6 64 mg/l, respectively, EC values were recorded on the same days at 626 µmhos/cm and 664 mmhos/cm, respectively, pH values were recorded at 7 08 and 7 94, respectively, temperatures were measured at 17 8 °C and 18 6 °C Dissolved oxygen was monitored at R-2 during the 16 April, 22 May and 13 June monitoring events at concentrations of 5 22 mg/l, 7 37 and 6 94 mg/l, respectively, EC values were recorded on the same days at 967 ,umhos/cm, 728 umhos/cm and 1,034 ,umhos/cm, respectively, pH values were recorded at 7 24, 7 12 and 7 94, respectively, temperatures were measured at 17 5 'C, 17 6 'C and 205 °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 2 9 and 4 8 nephelometric turbidity mots (NTUs), TDS ,values of at concentrations between 60 mg/l and 603 mg/1 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 1,075,700 gallons of MTBE -impacted water were treated during the second quarter, a total volume of approximately 13,972,813 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 27 March and 16 April 2002 was equal to 370,027 gallons, which equates to a mass of 3,084,915 pounds of water Multiplying the average MTBE concentration (assumed to be 22 5 yg/l based on the average of the 27 March and the 16 April 2002 influent grab water samples) by the pounds of extracted MTBE-unpacted 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 16 April and 22 May 2002 was equal to 287,717 gallons, which equates to a mass of 2,398,697 pounds of water Multiplying the average MTBE concentration (assumed to be 30 5 ,ug/l based on the average of the 16 April and the 22 May 2002 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) r Advanced GeoEnvironmental, Inc.