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DRILL HOLE PLUGGING METHOD <br />SURFACE <br /> <br />CEMENT PLUG <br />HEAVY MUD, DRILL CUTTINGS OR CEMENT <br />.. <br />' 50' <br />-- <br />.; <br />.:.. , <br />_. <br />_ ... _. _ <br />_._._ ; <br />50' <br />HEAVY MUD, DRILL CUTTINGS OR CEMENT <br />50' <br />CEMENT PLUG <br />', / <br />COAL / /i. r /SEAM <br />so' <br />