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RULE 2 PERMITS <br />, , t k:' .site; •Fr aaP.l,at6P ^ x �. ^p:.. .�, � , _ . ¢, , , � . ,. ,. e,,. �,. ,., <br />2.05.4 (2)(f -h) Disposal, Mine Openings, Water and Air Control <br />Acid -Forming and Toxic -Forming Materials <br />No significant acid-forming materials exist within the overburden soil or coal seams to be mined. <br />Therefore, Colowyo will not undertake special handling procedures as described in Section 2:05.3. A <br />detailed description of the chemical characteristics of soils and overburden materials is presented under <br />Sections 2.04.6 and 2.04.9. <br />For a detailed description of the special handling of spoil material and sampling programs, refer to the <br />Production Methods and Equipment Segment of this section. <br />Flammable liquids, such as oil and fuel, will be protected from spilling into other areas by earthen, <br />concrete or HDPE lined structures surrounding each storage facility. A spill containment control plan <br />protects against spills and will be available to the Division to review as requested. <br />All major equipment on the Collom area mine operation will be equipped with portable fire extinguishers <br />or automatic fire suppression systems. The water trucks used for dust suppression at this location could <br />also be used to control most fires. <br />Sealing of Exploration and In -Pit Mine Drill Holes <br />Exploration and in -pit mine drill holes which remain open for use as a water supply well or for use as a <br />groundwater monitoring well will be completed following the guidelines of the Colorado Division of <br />Water Resources Water Well Construction Rules (2 CCR402-2, Eff. Date January 1, 2005).When the <br />groundwater monitoring wells are no longer needed or required for any purpose, each well will be <br />eliminated by plugging plugged and/or sealed following the before mention guidelines of the Colorado <br />Duivision of Water Resources. <br />Plugging procedures utilized for exploration drill holes that will not be mined through during the current <br />Permit term are as follows: <br />1. Drill holes drilled deeper than the stripping limit (450-500 feet) will be plugged by pumping <br />cement or heavy solids bentonite Plug Gel or chips through the drill stem from the bottom up to <br />within 3 feet of the ground surface. <br />2. Drill holes shallower than stripping limits (450-500 feet) may be plugged with the ready -mix <br />concrete method instead the method in #1 to within 3 feet of the ground surface. <br />3. Drill holes with no water or coal zones may be plugged by backfilling with cuttings, and placing a <br />plug ten feet below the ground surface to support a cement plug or bentonite chips to within 3 feet <br />of the ground surface. <br />For safety considerations, exploration drill holes that will eventually be mined through during the present <br />Permit term need only be covered with wood, plastic or other such material or otherwise bermed to <br />prevent access. <br />Those holes completed in continuous water bearing zones will be sealed entirely with cement or other <br />suitable sealant to within 3 feet of the ground surface. <br />Where possible, the sealed holes will be marked. At times reclamation operations will cover up the sealed <br />drill holes and marking of holes will not be possible. <br />Collom —Rule 2, Page 101 Revision Date: 11/16/16 <br />Revision No.: MR -166 <br />