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0 <br /> CL�EARWATER <br /> G R O U P <br /> Enolronrnrntcl Srroecn <br /> The oxygen feed pressures for the individual wells range between 3 5 psi and 5 0 psi Gas flow <br /> rates for each of the wells is 20 cc/min Dissolved oxygen in the remediation wells increased <br /> from approximately 10 mg/L to concentrations on the order of 30 mg/L within the first two <br /> weeks of iSOC system operation <br /> SUMMARY AND CONCLUSIONS <br /> Results from this quarterly monitoring event appear generally consistent with those from <br /> previous groundwater monitoring activities However, trace amounts of BTEX were detected in <br /> the samples from MW-2, MW-3, and MW-4 after numerous quarters in which they remained <br /> below detection limits Known contaminant concentrations are currently highest at monitoring <br /> wells MW-1, MW-5B, and MWA and in comparison with previous quarters, have increased in <br /> MW-1 and MWA and have diminished in MW-513 <br /> During the third quarter, twelve remediation infection wells and an oxygen-infusion system <br /> ("iSOC") were installed on the site The iSOC system has increased DO in the remediation wells <br /> from "baseline" levels of approximately 1 mg/L to concentrations on the order of 30 mg/L <br /> Clearwater is currently conducting monitoring of the 1SOC system, and collection of DO, ORP, <br /> total and ferrous iron, pH, temperature, and specific conductivity measurements on a bi-weekly <br /> basis Clearwater will perform system monitoring on a monthly basis Clearwater will be <br /> continuing with the regular quarterly groundwater monitoring schedule for the foreseeable <br /> future <br /> ZB178C/3rdQtr 2004 Monitoring Rpt 9 October 8,2004 <br />