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p� • 30 October 2004 AGE-NC Project No 96-0232 - Page 5 of 14 total dissolved solids, flow rate, specific conductivity (EC), pH and turbidity on 15 July 2004 In addition, observations were noted in a log book (Appendix A) of floating or suspended matter, discoloration,bottom deposits,aquatic life,visible film-sheen-coatings,fungi and potential nuisance conditions Water monitoring could not be performed from R-1 during the 15 July 2004 monthly monitoring events because there was no upstream water flow Because there was no upstream flow at R-1, the downstream flow rate at R-2 appeared to be equal to the ground water pump and treat effluent flow rate of approximately 21 GPM Observations logged in a notebook on the above dates indicated that there was no floating or suspended matter,discoloration,bottom deposits or visible film-sheen-coatings at R-1/R-2,however there was a small amount of algae growth at the bottom of the ditch Visible aquatic life at R-2 included minnows, insects and frogs Potential nuisance conditions observed at R-2 included trash in ditch(i e fast food containers,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-2 on the above date at a concentration of 4 84 mg/l, EC was recorded on the same day from R-2 at 771 gmhos/cm and a pH value at 7 41 Laboratory analysis of the above R-2 grab water sample reported a turbidity value at a concentration of 0 2 nephelometric turbidity units (NTUs) Field measurements are recorded in Appendix A, laboratory reports are in Appendix B 2 7 MASS-VOLUME REMOVAL CALCULATIONS Based on effluent flow meter observations(Appendix A, Table 5),approximately 885,468 gallons of MTBE-impacted water were treated between 15 June and 17 August 2004, a total volume of approximately 27,086,201 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 June 2004 and 17 August 2004 was equal to 885,468 gallons, which equates to a volume of 3,355,924 liters of processed water Multiplying the average MTBE concentration (assumed to be 47 gg/1 based on the July 2004 influent grab water samples) by the pounds of extracted MTBE-impacted ground water yields approximately 0 35 pounds of MTBE removed from MTBE-impacted ground water during this period (Appendix C) Advanced GeoEnvironmental,Inc