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' l l August 2003 i AGE-NC Project No 96-0232 ' Page 5 of 15 Utilizing a Blue-White Industries F-2000 flow meter, flow rates were measured and recorded on the ' above dates to be between 19 50 GPM and 22 00 GPM (Appendix A) ' 2 6 RECEIVING WATER MONITORING RESULTS ' In accordance with the requirements of RWQCB Monitoring and Reporting Program No 5-00-119, monthly ground water pump-anal-treat receiving water(R-1 and R-2)monitoring was performed for total dissolved solids, flow rate, specific conductivity(EC), pH and turbidity Observations noted I in a log book (Appendix A) included floating or suspended matter, discoloration, bottom deposits, aquatic life, visible film-sheen-coatings, fungi and potential nuisance conditions I Water monitoring could not be performed from R-1 during the 21 April, 14 Mayor the 25 June 2003 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 20 to 25 GPM Observations logged in a notebook on the above dates indicated that there was no floating or liesuspended 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 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 dates at concentrations between 4 99 mg/l and 6 06 mg/l, EC values were recorded on the same days between 505 µmhos/cm and 644 µmhos/cm,pH values were I recorded at between 7 37 and 7 42, temperatures were measured at between 17 5 °C and 20 4 °C Laboratory analysis ofR-2 grab water samples collected during the above monthlymomtonng events reported turbidity values at concentrations between 0 3 and 7 9 nephelometric turbidity units (NTUs),a TDS value of 581 mg/1 was reported on 25 June 2003 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 2,090,669 gallons of MTBE-impacted water were treated during the second quarter 2003; a total volume of . approximately 21,589,805 gallons of MTBE-impacted water has been treated at the site since the start-up period in November 2000 Advanced GeoEnvyronmental,inc