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10/12!1998 16.09 9165350207 APEX ENVIROTECH <br /> PAGE 17 <br /> Kir, E <br /> More About. SRC <br /> l+ n�..�y <br /> TeCh"f <br /> ORCM <br /> NA <br /> f" r,Y1 ap <br /> t <br /> u <br /> ABOUT OXYGEN.'RELEASE COMPOUND, ORCW <br /> Oxygen Release Compound, CIRC, is a patented formulation ofmagnesium peroxide, M'902, which <br /> when moist releases oxygen slowly. The hydrated product is magnesium hydroxide, Mg(OH)2.The <br /> oxygen release rates is dependent upon the level of the contaminantflux. Generally, the product <br /> aril! continue to release oxygen for about 6 months. <br /> We have found; and the literature supports, that 'coxygen is the limiting factor in aerobic <br /> bioremediation. The",microorganisms, nutrients and moisture are typically present but most sites <br /> are oxygen defla't, with bioremediation proceeding anaerobically. The addition of oxygen <br /> significantly Increases the remediation rate, typically by one.or two orders of magnitude. <br /> ORC will not harm an aquifer. It is virtually Insoluble. 6iofoul ng is inhibited by an elevated, but <br /> localized, pH. Iron fouling is avoided, particularly when compared to air sparging, by:.the long, <br /> gentle release of dissolved oxygen which is dispersed widely. The hydrated product -is harrmles's <br /> Mille of Magnesia which converts to a solid form. This ESRC residue may be used as a grout or filler <br /> material In the saturated zone. <br /> ORC is useful as a slow release source of oxygen in the remediation of any compound that is <br /> aerobically degradable. ORC has been used In the successful remediation of dissolved phase>TPH <br /> .. and BTEX compounds. ORC is most frequently used to address dissolved phase contamination plus <br /> sorbed material in the saturated, capillary fringe and smear zones. ORC should not be usedwhenmore than a sheen offree product is evident. <br /> ORC may be applied to mast several Objectives. The product may be used in an excavated tank pit <br /> to eliminate one of the toughest and most persistent sources of contarrtinatton at, or near, the <br /> solllgrouundwater,interface. ORC may be applied in the aquifer creating a highly oxygenated.zone <br /> near the original source of the contamination. The resultant<increased microbial activity will <br /> reduce the contaminant,mass, thereby collapsing the plume so that compliance at a point closer to <br /> F <br />