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' 30 October 2003 AGE-NC Project No 96-0232 ' Page 6 of 15 ' 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 20 to 25 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-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 a 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 dates at concentrations between 3 76 mg/1 and 4 20 mg/l, EC values were recorded on the same days between 712 µmhos/cm and 805 gmhos/cm,pH values were recorded at between 6 86 and 7 70, temperatures were measured at between 21 6 °C and 25 9 °C Laboratory analysis ofR-2 grab water samples collected during the above monthly momtonng events reported turbidity values at concentrations between 0 3 and 1 0 nephelometric turbidity p b ity units (NTUs), a TDS value of 571 mg/1 was reported on 15 September 2003 Analytical results are summarized in Table 2, field measurements and Iaboratory reports are in Appendix C 2 7 MASS-VOLUME REMOVAL CALCULATIONS I Based on effluent flow meter observations (Appendix A, Table 8), approximately 835,840 gallons of MTBE-impacted water were treated during the third quarter 2003, a total volume of approximately 22,425,645 gallons of MTBE-impacted water has been treated at the site since the start-up period m November 2000 The volume of extracted water between 25 June and 25 July 2003 was equal to 346,816 gallons, which equates to a mass of 2,891,405 pounds of processed water Multiplying the average MTBE concentration (assumed to be 18 µg/1 based on the average of the June and the July 2003 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 25 July and 29 August 2003 was equal to 317,601 gallons, which equates to a mass of 2,647,840 pounds of processed water Multiplying the average MTBE concentration(assumed to be 18 5 gg/l based on the average ofthe July and the August 2003 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) I Advanced GeoEnvironinental,inc I