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b) An area under study for designation as unsuitable for surface coal mining operations <br />c) The boundaries of the National Park System, the National Wildlife Refuge System, the <br />National System of Trails, the National Wilderness Preservation System, the Wild and <br />Scenic Rivers System including rivers under study for designation, and National <br />Recreation Areas [2.07.6(2)(d)(iii)(A)]; <br />d) Three hundred feet of any public building, school, church, community or institutional <br />building, or public park [2.07.6(2)(d)(iii)(B)]; <br />e) One hundred feet of a cemetery [2.07.6(2)(d)(iii)(C)]; <br />f) The boundaries of any National Forest unless the required finding of compatibility has <br />been made by the Secretary of the U.S. Department of Agriculture [2.07.6(2)(d)(iii)(D)]; <br />g) One hundred feet of the outside right-of--way line of any public road except where mine <br />access or haul roads join such line, and excepting any roads for which the necessary <br />approvals have been received, notices published, public hearing opportunities provided, <br />and written findings made. <br />PR-02 approved undermining a portion of Routt County Road No. 27 in Section 33 of <br />TSN R86W and Section 25 of TSN R87W. Routt County approved this undermining and <br />subsidence of the road and the Division stipulated that the written approval from Routt <br />County be submitted prior to any longwall mining below the surface of the road. The <br />Division published notice of a public hearing in the Steamboat Pilot on July 16, 1992. <br />No comments concerning the mining within 100 feet of the right-of--way were received <br />from the public. Warning signs were posted along the road in the zone of subsidence. <br />Subsidence and rockfall due to mining in Panel 6 in the SW Mining District required <br />that the operator re-design the mitigative measures proposed originally under PR-02 to <br />protect the use of County Road No. 27 in Sections 33, TSN R86W and Section 25 of <br />TSN, R87W. Technical revision 19 (TR-19) approved construction of a trench berm <br />system approximately 4200 feet in length adjacent to County Road No. 27 to stop any <br />rockfall prior to reaching the county road. Exhibit 7a, Stability Investigation of the <br />Twentymile Sandstone Cliff, and Exhibit 7f, Rockfall Hazard Assessment and Selection <br />of Hazard Control or Mitigation Measures, outline details with regard to the cliff, <br />County Road No. 27 and required mitigation measures. As a result of undermining the <br />cliff along County Road No. 27 in Panels 7, 8 and 9 of the Southwest Mining District, <br />substantial rockfall did occur. The trench berm system along the road, in addition to <br />slight road relocation, proved to be an effective and necessary measure to protect the <br />safety of the public users of this road as numerous boulders were trapped in the <br />trench berm system. <br />17 <br />