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GAS MIGRATION PROBE DATA <br /> Sample Sample Sample Hydrocarbons Measured as Methane <br /> Number Date Time (ppm or percent by volume) <br /> P-1 02/16/88 13:50 50 percent <br /> P-2 02/16/88 16:00 2 ppm <br /> P-3 02/18/88 10:36 3 ppm <br /> P-4 02/18/88 11:28 10 ppm <br /> P-5 02/18/88 14:41 0.4 percent <br /> P-6 02/18/88 15:32 30 percent <br />