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WIN EMIEZ 11,11: Oxygen Release Compound (ORC') offers a passive, cost-effective approach to accelerating aerobic bioremediation. ORC is a patented formulation of magricsium peroxide that time-releases oxygen when hydrated in accordance with the following reaction: Mg02 + H2O -- '/202 + Mg(OH)2 Oxygen is often the limiting factor for aerobic microbes capable of biologically degrading contaminants such as petroleum hydrocarbons. Without adequate oxygen, contaminant degradation will either cease or may proceed by muds slower anaerobic(oxygen-free)processes. ORC releases oxygen for six months to one year. 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., nitroaniline, nitrobenzene), chloroaromatics (e.g., chlorobenzene,perttac}tlorophenol)and certain chlorinated aliphatics (e.g.,vinyl chloride, dichloromethane). ORC's Time-Release Feature: It's Benefits I. Low Capital. Design. and 0&M Costs: 4. Minimal Site Disturbance: Since ORC is a passive, in-situ approach, substantial ORC offers an in-situ treatment that requires no above- design, capital, and operations/maintenance (O&M) ground equipment after initial injection,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. 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 rate of oxygen released by ORC avoids ciated with other chemical oxygen sources. the potential hazards with the injection of highly reactive materials such as hydrogen peroxide. 2. Eliminates Long-Term Monitoring Costs Associated with Natural Attenuation: 6. Environmental 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(OM, 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 plume can pose significant Slow-release compounds are ideal for sites where financial and health risks. ORC can be strategically geological or physical conditions make active systems applied to remediate contaminants around the plume's inappropriate. Particularly in clay soils,where pumping perimeter to abate plume migration and avoid the is difficult and sparging promotes channeling, the slow potential liability associated with unmanaged natural release of diffusible materials has distinct advantages. attenuation.