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24HG2E27XC Sample Hole(s) Project Plan <br />Minor Revision 320 <br />Page 8 of 12 <br />Due to the size and number of drill holes several cuttings retention options aze being <br />analyzed. These include: <br />• Piping of cutting from a mud pit located in native soil on the drill pad through a <br />slurry pipe across MCC owned property to a temporary impoundment located on <br />MCC owned property. Excess water could be decanted from the temporary <br />impoundment and settled solids removed. <br />• Use of mud pits on or neaz the drill pad excavated in native soil. Mud pit <br />dimensions would be 41' x 41' x 8' to accommodate cuttings with 25% swell, the <br />run-off associated with a 2 acre drill pad and 10 year, 24-hour storm event and 1-ft <br />of freeboard. Mudpit designs and calculations for 1.0 foot of freeboard have been <br />previously approved by the CDMG. <br />• Hauling cuttings off the project site and depositing in the Refuse Pile Expansion <br />azea. <br />As the drill pad is located at the floor of a valley, and pits shall be excavated into native <br />soil, mud pit slope failure is not a concern. Excess run-off will be accommodated through <br />a set of diversion ditches and a culvert. <br />Water for the drilling operations will be pumped to the drill sites from the mine <br />dewatering polishing pond using high-pressure hose in combination with frac tanks and <br />high-pressure pumps. Mountain Coal Company, L.L.C. owns water rights for these water <br />resources. <br />DRILLING ACTIVITIES <br />Drilling activities for the proposed methane drainage wells will include mobilizing drill <br />equipment to the sites and drilling and setting approximately 1,000 feet of 17-inch surface <br />casing into bedrock to a zone 50-ft above the coal seam. The holes will then be rotary <br />drilled with a 14-inch diameter hole to the B-Seam. A depiction of a typical completed <br />well will be forwazded to the CDMG along with the typical plug and abandonment <br />diagram. <br />MONITORING <br />Currently, MSHA is requiring monitoring and inspection of the wells twice daily after <br />installation. It is anticipated the frequency of monitoring would decrease to a weekly <br />monitoring and inspection of the installation. Routine maintenance will occur to the <br />extent necessary, simultaneous with the weekly monitoring. <br />