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DRILL HOLE PLUGGING METHOD <br />SURFACE <br />CEMENT PLUC <br />HEAVY MUD, DRILL CUTTINGS OR CEMENT <br /> <br />~. -~ <br />. I <br />• i~ <br />HEAVY MUD, DRILL CUTTINGS OR CEMENT <br />50' <br />CEMENT PLUG <br />', / <br />coal ~ ~~.:r ~ sEaM <br />i <br />50' <br />