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�vv <br /> CLEARWATER <br /> 10G R O U P <br /> Enaro mn[eq ta! Sera[es <br /> estimated degradation rate of 0 1024 per day The degradation rates are consistent with previous <br /> observations <br /> iSOCrm System Monitoring <br /> The iSOC system began operating on August 8, 2004 After the initial system installation and <br /> start-up monitoring activities, the system was placed on a monthly operations and maintenance <br /> (O&M) schedule During the first quarter of 2006, Clearwater conducted O&M activities at the <br /> project site on January 10th, February 71h, and March 8, 2006 The oxygen supply control panel is <br /> connected to the individual wells and uifusers via underground plastic tubing (Figure 9) The <br /> trenches where the plastic tubing is laid were inspected for damage and repaired or patched as <br /> needed The iSOCTM oxygen infusers installed in each of the remediation wells (IW-1 through <br /> IW-12) and the centrally regulated oxygen gas supply were inspected for damage and/or leaks <br /> The five tank manifold and regulator both have brass fittings Over time these fittings become <br /> stripped and worn, causing small gas leaks On January 10, 2006 the regulator and manifold were <br /> replaced The gas supply was replaced during the February 7, 2006 O&M visit After the tanks <br /> were replaced a leak was detected in the oxygen line for IS-8 between the oxygen control panel <br /> and where the line enters the trench A piece of new tubing was spliced into the line to replace <br /> the defective area During the March 81h event it was determined that one of the "pigtails" of the <br /> five tank manifold was defective The "pigtail" was removed from the manifold and returned to <br /> the manufacturer for repair. The oxygen (feed)pressures for the individual wells ranged between <br /> 6 5 psi and 19 psi The oxygen gas flow rate into each of the wells is maintained at <br /> approximately 20 cc/min <br /> Depth to water data was collected from each iSOCTM system well for use in oxygen consumption <br /> calculations,which predict the lifespan of the source oxygen supply On March 8, 2006 the static <br /> depth to water measured in the iSOCTM wells ranged from 8 07 feet bgs (IW-11) to 9 00 feet bgs <br /> (IW-4) <br />• <br /> ZB178I 5 of 10 May 2006 <br />