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RULE 4 PERFORMANCE STANDARDS <br /> 4.14.3 Covering Coal and Acid and Toxic Forming Materials <br /> Colowyo will not have any exposed coal seams remaining at the end of mining and reclamation. Colowyo <br /> does not have any acid forming materials at the mine. For discussion on acid- and toxic-forming materials, <br /> refer to Section 2.04.6. For disposal of non-coal wastes or materials constituting a fire hazard,refer to Section <br /> 4.11.4. <br /> 4.14.4 Thin Overburden <br /> Colowyo does not have a thin overburden situation as defined in Section 4.14.4 of the regulations. <br /> 4.14.5 Thick Overburden <br /> Colowyo does not have a thick overburden situation as defined in Section 4.14.5 of the regulations. <br /> 4.14.6 Re-grading or Stabilizing Rills and Gullies <br /> Please see Section 4.14.6 in Volume 1. <br /> 4.15 REVEGETATION REQUIREMENTS <br /> 4.15.1—4.15.7 Revegetation Requirements,Various <br /> These sections are addressed in the Volume 1. <br /> Field Trails <br /> A full description of field trials that have occurred adjacent to the South Taylor Pit can be found in Volume 1, <br /> Section 4.15.6. <br /> 4.15.8 Revegetation Success Criteria <br /> The vegetation monitoring methods and statistical analyses for the demonstration of revegetation success, <br /> vegetation cover, herbaceous production, and woody plant density are described in Volume 1, Sections 4.15.7 <br /> and 4.15.8. Refer to Section 2.04.10 of Volume 12 regarding vegetation reference areas applicable to the <br /> South Taylor and Lower Wilson mine areas. <br /> 4.15.9 Cropland Revegetation Success <br /> None of the reclaimed land will be used as cropland; therefore, the requirements of this subsection are not <br /> applicable. <br /> 4.15.10 Previously Mined Land Revegetation Success Criteria <br /> Although portions of the South Taylor pit have been previously mined, the revegetation success criteria <br /> established in 4.15.8 shall be used across the entire South Taylor pit. <br /> South Taylor/Lower Wilson—Rule 4,Page i l Revision Date: 7/23/18 <br /> Revision No.: TR-123 <br />