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ponds are utilized, minimum water levels will be established to ensure sufficient water is left for <br />stock and wildlife. <br />Upon hole completion, one truck mounted geophysical logging unit may be used at the <br />exploration hole location. If requested, Ark Land Company will retain in its 61es all drill and <br />geophysical logs and all un-analyzed drill cores for at least 1 year, and will make them available <br />for inspection by an authorized officer. <br />Estimated Size and Depth of Holes <br />Drilling conditions and diameters are variable on the pad area Geotechnical holes (up to 4) will <br />be drilled at 5-inches and will be drilled to refusal. <br />Initial diameter of the exploration hole will be 6 inches to allow for the placement of up to 100 <br />feet of surface casing. Tlus casing is centered and cemented in-place from the top of the hole. <br />The exploration hole will be continuously cored from bedrock to a point approximately 50 ft <br />below the E Seam (total expected depth from the surface approximately 450 ft). The primary <br />drilling medium w=ill be water to aid in the circulation of cuttings to the surface. <br />The core retrieved from the hole will be approximately 3 inches in diameter although smaller <br />diameter core (1 7/8'~ maybe used in some instances. The outer diameter of the cored portion of <br />the hole will be 5 inches or less. <br />Modification of Drill Holes to Surveillance for Water Levels <br />MCC is not proposing to convert any of the holes to water monitoring wells. <br />Drill Hole Abandonment Methods <br />MCC plans to plug and abandon the exploration hole once all geotechnical testing and <br />hydrologic information has been obtained <br />The drill hole plugging method described in 43 CFR II 3484.1(a) will be used for the exploration <br />hole. Each hole will be plugged with cement slurry through mineably thick coal beds and <br />aquifers for a distance of at least 50 feet above and below. The rest of the hole will be filled with <br />an approved bentonitic complefion mud or gel, cuttings, or cement to within 10 feet of the <br />surface. A 10.foot surface plug will be set, and a brass tag or monument marking the drill hole <br />I.D. will be cemented atop the surface plug. Surface casing will be cut off at or just below the <br />level of the drill pad, allowing for future location and identification of the drill hole. <br />Geotechnical holes will be reclaimed by using the soils and cuttings placed back in the hole <br />