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k • <br /> The product releases oxygen when it comes in contact with water as shown by the following equation: <br /> M902 + H2O —► 'b02 t + Mg(OH)2 <br /> ORC will stop releasing oxygen when dry and will again release when rehydrated. The by-products of the reaction are <br /> oxygen and ordinary magnesium hydroxide, which make ORC environmentally safe to use. <br /> KINETICS OF OXYGEN RELEASE FROM ORC <br /> 100% <br /> 80% <br /> 80% <br /> ¢N <br /> W 70% <br /> 6 <br /> Z 60% <br /> C50% <br /> 40% <br /> � 30% I I <br /> f <br /> v <br /> 20% <br /> n0% <br /> 0% <br /> O 60 120 180 240 300 360 420 <br /> DAYS <br /> Figure 1 presents the oxygen release kinetics of ORC. The product releases about 10%of the available oxygen in the first <br /> few weeks and then releases the balance over period of six months to a year depending on the level of contaminant flux. <br /> ■ ■ • ■KUM I k,0 71 <br /> ORC should be considered for contaminated groundwater sites where aerobic bioremediation is the appropriate <br /> treatment technology. For application, ORC powder is mixed in a carrier matrix and contained in inert filter socks. A <br /> string of ORC Filter Socks is laced together and lowered into a well through the length of the contaminated saturated <br /> zone where contact with groundwater will initiate the release of oxygen. ORC Filter Socks are configured for two-, <br /> four-, and six-inch diameter wells (see Figure 2). When the oxygen returns to background levels,the socks containing <br /> ORC are removed from the well and, if necessary, new charges of ORC are added. <br /> ORC OXYGEN BARRIER <br /> ;x r. <br /> Dlssolrud-Phase <br /> Hydrocarbon Plume <br /> sr <br /> Groundwate Oeygen Borrier <br /> Direaion _ -- <br /> Plume Remediated <br /> OR(Socks in the Well <br /> Figure 2 depicts the Oxygen Barrier <br /> concept which prevents plume migration. <br />