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Injection of 180 tons of liquid carbon dioxide (equivalent to 3 million cubic feet as a gas) into the fire area through Borehole 2 was completed at 8:15 p.m. on January 17. A "Huff and Puff" exchanger regulated the flow of the liquid carbon dioxide into the mine. After a waiting period to allow the pipe and strata to warm, sampling at Borehole 2 resumed on January 20. Gas concentrations at Borehole 2 was approximately Methane-63%, Oxygen-0.6%, Carbon Monoxide-33 ppm, Carbon Dioxide-28%, and Hydrogen-6 ppm.