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RULE 4 PERFORMANCE STANDARDS <br />Collom – Rule 4, Page 22 Revision Date: 4/28/22 <br />Revision No.: TR-154 <br />4.23.2(5) Holes Not Need to be Plugged <br />Colowyo will backfill and plugge each highwall miner entrance hole. As required, this will occur within <br />30 days following coal extraction. Further, all highwall miner entrance holes will be buried by pit <br />backfill during the normal backfill sequence for the pit to remain in compliance with Rules 4.05.1 and <br />4.05.2. <br />4.23.2(6) Division Shall Prohibit Auger (Highwall) Mining <br />There is no probable reason to prohibit the highwall mining in light of no anticipated adverse impacts to <br />water quality, fill stability, pit backfilling, increased resource recovery, and highwall mining is designed <br />for zero subsidence to prevent disturbance or damage to power lines, buildings, or other surface facilities. <br />4.23.2(7) Backfill and Grading Requirements <br />Highwall mining will be conducted in accordance with the backfilling and grading requirements of 4.14. <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 mining area which would be adversely affected by mining operations; <br />therefore, no special performance standards for operations in the alluvial valley floors are applicable to <br />this mining permit application, and no protection or remedial measures are proposed for compliance to <br />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 />Based on the present data, no determination of mountain top removal has been made. When available, the <br />pertinent data will be delivered to the Division for a determination. <br />4.27 OPERATIONS ON STEEP SLOPES <br />Mining and reclamation activities for the Collom operation will generally occur on slopes that are less <br />than 20 degrees. On occasion, in limited areas, operations will occur on slopes greater than 20 degrees. <br />In accordance in Rule 4.27.2, operations can occur occasionally on steep slopes and the requirements of <br />Rule 4.27 do not apply. The Collom operations meet this definition. <br />4.28 FACILITIES NOT LOCATED AT THE MINESITE <br />All facilities used by Colowyo will be within the current permit boundary. Therefore, this section is not <br />applicable. <br />4.29 IN SITU PROCESSING <br />This section is not applicable.