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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 is occurring adjacent to the South Taylor Pit: <br />1) Colowyo established one small (one acre) tall shrub establishment site that that displays a thicker <br />topsoil condition. The location of this field trial is in reclamation unit ST001. Actual results from the trial <br />should yield information that can be used to apply additional stability and/or sediment control measures on <br />larger areas if this attempt is successful. <br />a) The area will be regraded in accordance with PMT requirements. <br />b) The area will be tested for overburden suitability as per requirements. <br />c) Approximately 48 inches of topsoil will be placed to replicate common topsoil depth conditions in <br />the surrounding area in stands of this nature. Once the topsoil has been placed, it will be cross - <br />ripped with a dozer or by other appropriate means to ensure the material is in a loose, rough <br />condition to encourage infiltration of rain/snowmelt an root development. <br />d) The Sagebrush Steppe mix has been modified to reduce the volume of "low shrubs" in favor of tall <br />shrub components of the mix. The grasses currently included in the mix were also reduced to <br />minimize competition, while still providing some soil stabilization function. The entire trial area <br />will be seeded with the modified Sagebrush Steppe Mix as seen below. In the event individual <br />components of the mix are unavailable, guidance from the Division will be sought prior to <br />implementation of the trial. Weedguard fabric or its equivalent will be placed in rows (at <br />intervals of approximately 22 feet) and will be used to severely reduce competition between the <br />containerized plantings and annual weeds and grasses. Please see the "Expected Field <br />Implementation Plan for Tall Shrub Field Trials" illustration below. <br />e) Containerized 2-3 foot serviceberry and chokecherry plants will be utilized from the most similar <br />source elevation available in the region. Based on the volume of containerized plants included in <br />South Taylor/Lower Wilson — Rule 4, Page I 1 Revision Date: 4/7/17 <br />Revision No.: RN -07 <br />