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I ORC TECHNICAL BULLETIN # I.2a I , Oxygen Release Compound,ORC® Early Proof-of-Concept Experiments in the Field After successful laboratory demonstrations, the industry's need for this innovative and effective technology prompted R EC EN ES IS to conduct several large-scale field tests of ORC. The OXYGEN BARRIER concept--involving the subsurface.placement of ORC to effect remediation of dissolved phase hydrocarbons -- was successfully demonstrated and the results published. The abstract from a study at the University of Waterloo is as follows: "A field test to evaluate the applicability of an oxygen releasing compound (ORC) to the remediation of ground water contaminated with benzene and toluene was conducted in the Borden Aquifer in Ontario, Canada. Benzene and toluene were injected as organic substrates to represent BTEX compounds, bromide was used as a tracer, and nitrate was added to avoid nitrate-limited conditions.' 'The fate of solutes was monitored along four lines of monitoring points and wells. Two - lines studied the behavior of the solutes upgradient and downgradient of two large- diameter well screens filled with briquets containing ORC and briquets without ORC. One line was used to study the solute behavior upgradient and downgradient of columns of ORC powder placed directly in the saturated zone. The remaining line was the control.' 'The results indicated that ORC in both briquet and powder form can release significant amounts of oxygen to contaminated groundwater passing by it. In the. formulation used in this work, oxygen persisted for at least 10 weeks. Furthermore, the study indicates that the enhancement of the available dissolved oxygen content of the ground water by ORC, can support the biodegradation of at least 4 mg/L each of benzene and toluene. Such concentrations are typical of those encountered at sites contaminated with petroleum hydrocarbons; therefore,these results suggest there is promise for ORC to enhance in-situ biodegradation of BTEX contaminants at sites using passive systems to contact the contaminated ground water with the oxygen source." Bianchi-Mosquera, et al. (1994). Enhanced Degradation of Dissolved Benzene and Toluene Using a Solid Oxygen-Releasing Compound, Ground Water Monitoring and Remediation, (GWMR),Winter 1994.