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DULLC 1 IN if I.La <br /> Oxygen Release Compound,ORC® <br /> i Early Proof-of-Concept <br /> Experiments in the Field <br /> After successful laboratory demonstrations, the industry's need for this innovative and <br /> effective technology prompted R EG E N ES 1 S to conduct several large-scale field <br /> tests of ORC <br /> The OXYGEN BARRIER concept--involving the subsurface placement of ORC to <br /> effect remediation of dissolved phase hydrocarbons -- was successfully demonstrated <br /> and the results published The abstract from a study at the University of Waterloo is as <br /> follows <br /> "A field test to evaluate the applicability of an oxygen releasing compound (ORC) to <br /> the remediation of ground water contaminated with benzene and toluene was conducted <br /> in the Borden Aquifer in Ontario, Canada Benzene and toluene were injected as <br /> organic substrates to represent BTEX compounds, bromide was used as a tracer, and <br /> nitrate was added to avoid nitrate-limited conditions ' <br /> 'The fate of solutes was monitored alongfour lures of monitoring points and wells Two <br /> g <br /> lines studied the behavior of the solutes upgradient and downgradient of two large- <br /> diameter well screens filled with briquets containing ORC and briquets without ORC. <br /> One line was used to study the solute behavior upgradient and downgradient of columns <br /> of ORC powder placed directly in the saturated zone. The remaining line was the <br /> control.' <br /> 'The results indicated that ORC in both briquet and powder form can release <br /> significant amounts of oxygen to contaminated groundwater passing by it In the <br /> formulation used in this work, oxygen persisted for at least 10 weeks. Furthermore, <br /> the study indicates that the enhancement of the available dissolved oxygen content <br /> of the ground water by ORC, can support the biodegradation of at least 4 mg/L <br /> each of benzene and toluene. Such concentrations are typical of those encountered <br /> at sites contaminated with petroleum hydrocarbons;therefore,these results suggest there <br /> is promise for ORC to enhance in-situ biodegradation of BTEX contaminants at sites <br /> using passive systems to contact the contaminated ground water with the oxygen <br /> source." <br /> Bianchi-Mosquera, et al (1994) Enhanced Deagdation is v d enzene <br /> and &Iuene U <br /> &Lnga SQltd e - elea rn m nd Ground Water <br /> Monitoring and Remediation, (GWMR),Winter 1994 <br />