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RULE 4 PERFORMANCE STANDARDS <br />4.23.10 Backfill and Grading Requirements <br />Highwall mining will be conducted in accordance with the backfilling and grading requirements of 4.14. <br />4.23.11 Highwall Shall be Eliminated <br />Highwall mining is proposed to occur in areas previously mined with adequate material on hand to <br />backfill the pits with proper static safety factors for stability to the approved postmining topography <br />thereby eliminating all highwalls. Any minimal spoil material generated by the highwall mining <br />operation will be buried at depth in the pit backfill. All coal seams mined will be adequately covered by <br />pit backfilling in conformance with the permitted PMT and reclamation plan. No remnant highwalls will <br />be left at conclusion of the reclamation activities and no spoil material will be place on any outslopes. <br />4.24 Operations in Alluvial Valley Floors <br />The field investigation described in Section 2.04.7 and 2.06.8 resulted in no identification of alluvial <br />valley floors in the general area which would be adversely affected by mining operations; therefore, no <br />special performance standards for operations in the alluvial valley floors are applicable to this mining <br />permit application, and no protection or remedial measures are proposed for compliance to this Section. <br />4.25 Operations on Prime Farmlands <br />Since a negative determination of prime farmland was arrived at using the eligibility requirements <br />established for prime farmland under Section 2.04.12, these performance standards do not apply to the <br />present permit application. <br />4.26 Mountaintop Removal <br />No mountaintop removal will be conducted by Colowyo. <br />4.27 Operations on Steep Slopes <br />No operations at Colowyo will be conducted on steep slopes as defined in this seciton. <br />4.28 Coal Processing Plants and Support Facilities not Located at or Near the Mine Site or not <br />Within the Permit Area for the Mine <br />Colowyo will not use any coal processing plants or support facilities not located at or near the mine sites <br />therefore, this Section is not applicable to the permit application. <br />4.29 In -Situ Processing <br />Colowyo will conduct no in-situ processing; therefore, this Section is not applicable to the permit <br />application. <br />4.30 Cessation of Operations <br />4.30.1 Temporary <br />If, for any unforeseeable circumstances, temporary cessation of mining and reclamation operations at the <br />Colowyo operation becomes necessary for a period of thirty (30) days or more, Colowyo will submit to <br />Rule 4 Performance Standards 4-79 Revision Date: 1/31/18 <br />Revision No.: TR -119 <br />