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A detailed description of the sealing of underground openings may be found in Section <br />2.05.4 of the permit with a typical portal seal illustrated in Figure 57. Drill hole sealing <br />may be found on in Section 2.05 of the permit. All existing and future drill holes will be <br />sealed in accordance with Rule 4.07. Mine No. 9 portals were sealed prior to waste <br />material being placed at the No. 9 Mine Portal Excavation. Inspection reports indicate <br />that sealing and initial material storage in the No. 9 Mine Portal Excavation commenced <br />prior to 1991. The Mine No. 5 portals were sealed in 1997 in accordance with Rule <br />4.07.3. Final backfill of the portals and highwall above the portals has not been <br />completed at the time of this permit renewal. Mine No. SA portals were sealed in 2003 <br />in accordance with Rule 4.07.3. Backfill of the Mine No. SA portals has not occurred at <br />the time of this writing (2003). <br />V. Use of Explosives <br />RAG Empire Corporation is not proposing to conduct surface blasting in their mining <br />operation. Should RAG Empire need to conduct surface blasting in the mining <br />operation, the requirements of this section must be addressed and submitted to the <br />Division for approval. <br />VI. Coal Mine Waste Banks <br />The applicant has presented a detailed engineering design for an approximately one- <br />million-cubic-yazd coal processing waste pile, also known as the Surface Waste Pile, <br />located within the boundaries of the Eagle Mine Complex permit area, as depicted on <br />Permit Map 25. Exhibit 21 of the permit contains a design report for the coal processing <br />waste pile prepared by CTL/Thompson, Inc., and three supplemental documents <br />pertaining to amendments in design details and construction specifications, aswell as <br />results of inspection certifications performed by the design engineer. Collectively, these <br />documents represent the.amended design for the coal processing waste pile at the Eagle <br />Mine Complex. <br />The applicant will dispose of an additional 200,000 cubic yards of waste in the <br />abandoned Eagle No. 9 Mine's Portal Excavation, depicted on Permit Map 25. The <br />details of this disposal plan aze presented on Map 28 of the amended permit application, <br />including a detailed site plan and appropriate cross sections. Mining ceased at the No. 9 <br />Mine in 1985. <br />The combined capacities of these two disposal azeas represent the refuse generated by <br />the production of 60 million tons of coal. At the maximum projected annual production <br />rate of 4.0 million tons, this represents a 15-year disposal capacity. <br />The pile has been designed with maximum facial outslopes of 4:1 (horizontal to vertical) <br />and a maximum height of 55 feet. A stability analysis performed by CTL/Thompson, <br />Inc. ascertained a minimum static slope safety factor of 3.6, assuming an angle of <br />internal friction of 42° and cohesion of 0 pounds per square foot. Confirming laboratory <br />testing performed by the applicant determined an angle of internal friction of 42° and a <br />27 <br />