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I ya iw 18 8 8 0 ----------------- Oxygen Release Compound (ORC') offers a passive, cost-effective approach to accelerating aerobic bioremediation. ORC is a patented fonnu.lation of magnesium peroxide that time-releases oxygen when hydrated in accordance with the following reaction: 1 Mg02 + H2O - I/202 + Mg(OH)2 I Oxygen is often the limiting factor for aerobic microbes capable of biologically degrading contaminants such as petroleum hydrocarbons Without adequate oxygen, contaminant degr-id-ition will either cease or may proceed by mudn slower anaerobic(oxygen-free)processes ORC releases oxygen for six months to one dear Indigenous aerobic microbes flourish in the presence of the long-lasting oxygen source, accelerating natural attenuation of target contaminants such as BTEX, ' gasoline and diesel range organics, MTBE, nitroaromatics (e g, nitroanilme, nitrobenzene), chloroaromatres (e g, chlorobenzene,pentaeliloroplienol)and certain chlorinated ahphatics(e g,vinyl chloride, dichloromethane) ORC's Time-Release Feature: Id's Benefits I. 1 Low Capita( Design and O&M Costs 4 Minimal Site Disturbance Since ORC is a passive, in-situ approach, substantial ORC offers in in-situ treatinent that requires no above- design, capital, and operations/maintenance (O&M) ground equipment after initial infection, thereby allowing costs are avoided Actively engineered systems such as remediation without disrupting normal business or pump and treat or air sparging with soil vapor extraction commercial activities Applying ORC to the subsurface are expensive, time-consuming, and often require is fast and easy, leaving no visible sign of its activity I extensive site design Furthermore, by providing a con- stant, steady oxygen source, ORC reduces O&M costs 5 Safe Application and Treatment compared to the repeated or continuous injections asso- The controlled rite of oxygen released by ORC avoids ' ciated with other chemical oxygen sources the potential h izards with the injection of highly reactive materials such as hydrogen peroxide 2 Eliminates Long-Terra Monitoring Costs Associated with Natural Attenuation 6 Environrnentat Safety By accelerating the rate of natural attenuation, ORC Besides oxygen the only other byproduct of ORC's decreases the time to site closure This eliminates the reaction with water is magnesium hydroxide Mg(OH)2 cost of quarterly or yearly monitoring events that would or Milk of Magnesia, a substance routinely ingested as have been required for unassisted natural attenuation an antacid 3 Reduces Risk and Potential Liability 7 Applicable at Difficult to Manage Sites If left unchecked,a migrating plurne can pose significant Slow-release compounds are ideal for sites where financial and health risks ORC can be strategically geological or phvsical conditions make active systems applied to remediate contamin ants around the plume's inappropriate Particularly in clay soils, where pumping perimeter to abate plume migration and avoid the is difficult and spargnng promotes channeling, the slow potential liability associated with unmanaged natural release of diffusible materials has distinct advantages • attenuation