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CLEARWATER <br /> G R O U P <br /> Envtronmenta7 Services <br /> Oxidation-reduction potential (ORP) over the past quarter ranged from a low of —24 millivolts <br /> (mV) in MW-7 in October 7, 2004 to a high of+31 mV on the same date in MW-3 The ORP <br /> for the iSOC wells ranged from —100 mV in IW-12 to +33 mV in IW-5 on December 7, 2004 <br /> The ORP readings indicate a change from originally reducing environment prior to 1SOC <br /> installation to a marginally oxidizing environment at present The shallow groundwater is <br /> currently not strongly oxidizing <br /> SUMMARY AND CONCLUSIONS <br /> • The estimated groundwater flow during this quarter is in southeast direction with a <br /> gradient of approximately from 0 0048 ft/ft to 0 0056 ft/ft <br /> • Groundwater under the site changes gradually from reducing to oxidizing conditions <br /> • Analyzed hydrocarbon concentrations sampled from this quarterly monitoring event <br /> appear to be generally lower than those obtained from previous groundwater monitoring <br /> activities The lower concentrations in the monitoring wells might be related to changes <br /> in water elevation or the influence of 1SOC remediation system <br /> • Continued treatment and monitoring is scheduled for the foreseeable future <br /> I <br /> 4Q/04 Groundwater Monitoring Report 10 <br />