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*JAN-16-1996 15:20 REGENESIS <br /> �../ <br /> P.05 <br /> Various applications of ORO can meet a wide range of remediation objectives. As a primary treatment system in <br /> groundwater applications, ORC can be configured to form an Oxygen Barrier across-a contaminated Plume. A properly <br /> placed row of wells or a trench containing ORC will slowly release oxygen, enhance bioremediation, and cut off the <br /> Plume in the oxygenated zone (see Figures 2 and 3).The Oxygen Barrier concept was successfully demonstrated by <br /> the University of Waterloo in Canada and at sites in North Carolina, Alaska and New Mexico. BTEX compounds were <br /> significantly remediated at points downgradient from the Oxygen Barrier. <br /> TOTAL BTEX CONCENTRATIONS PARTS PER MILLION(PPM) <br /> " El. p <br /> .. <br /> BMW= SO DAYS AFTER INSTALLATION <br /> 93 BAYS AFTER INSTALLATION <br /> figure 3 illustrates the reduction of 8 rU as it attempts to3 4 now through <br /> REPRESENT(PPM) the oxygenated zone generated by an ORC Oxygen Barrier at a site in <br /> New Mexico. The view is presented as if one were in the saturated zone <br /> facing the barrier. The area represented here Is 20'x 20' <br /> Primary Treatment —ORO can be used as the primary treatment method at sites where groundwater contamination <br /> concentrations require active remediation.The goal is prevention of plume migration off-site. <br /> Concurrent Treatment—At sites where another technology such as pump and treat is already installed, or planned for <br /> installation,ORC can be used to concurrently improve remediation results. <br /> Follow-on Treatment—ORO can be used to continue groundwater remediation at sites where the primary technology <br /> is no longer cost effective—as when pump and treat operations reach an inefficient plateau. <br /> Monitoring/Risk Reduction—This includes introducing ORC into existing monitoring wells at sites with groundwater <br /> contamination. ORC may reduce the required frequency and duration of monitoring by promoting degradation of low <br /> levels of contaminants and in certain situations may reduce source area contaminants enough to meet risk reduction <br /> objectives. Also this can be a cost effective method of performing a pilot study to determine how well ORC will work <br /> on a particular site before more extensive ORO treatment. <br /> OTHER REMEDIAT10I11 OPTIONS <br /> Sail Treatment — ORC can be mixed directly in soil to supply oxygen for remediation in biopiles and landfarming <br /> applications. This is particularly useful when soil conditions and/or physical location contraindicate mechanical <br /> aeration strategies. In some cases, ORC can be mixed into soil on the floor of an excavation, as clean fill is added, to <br /> prevent recontamination by groundwater as the table rises. <br /> Odor Control—ORC has been Successfully demonstrated to control odor in anaerobic impoundments. <br /> 0 Page <br />