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Third Park Federal Coal Exploration License Environmental Assessment <br />Drill holes would typically be less than 6 inches in diameter and would have an average depth of about <br />135 feet. Drilling mud would be used to plug each hole. Drilling mud would be pumped through the drill <br />pipe to the bottom of the hole, and the hole would be filled while removing the drill pipe. Bentonite chips <br />(approximately I50 pounds of 3/8-inch) and drill cuttings would be added to the hole within a depth of 10 <br />feet below ground surface. Commercially available "sakcrete" would be used to complete the plug, filling <br />the hole level with the ground surface. This method of hole plugging is consistent with procedures <br />approved and incorporated in the New Horizon Mine Permit (C-81-008) issued by the Colorado Division <br />of Minerals and Geology. An aluminum cap with the hole identification code would be set in the cement <br />plug. <br />Western Fuels CEL Envirorcmenm! Assessment <br />