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2. Colowyo demonstrated that fill proposed to eliminate the highwall and depressions meets all <br /> the requirements of 4.05, 4.06, 4.09 and 4.15. Therefore, the Division proposes that excess <br /> material not required for reclaiming highwalls and other depressions need not be returned to <br /> approximate original contour(Rule 4.14.1(2)(a)). <br /> 3. In order to conserve soil moisture, ensure stability, and control erosion on final graded <br /> slopes, the Division approved cutandfill terraces. These terraces are compatible with the <br /> postmining land use, and will meet all the requirements of Rule 4.14.2(2). <br /> 4. Permitted small depressions (less than two acre-foot in capacity, embankments less than five- <br /> feet) in the backfill are used to minimize erosion, create or enhance wildlife habitat, conserve <br /> soil moisture, and promote revegetation. The Division specifically approves each such small <br /> depression (Rule 4.14.2(3)). <br /> 5. The Division approved Colowyo's plan for disposal of debris, acidforming or toxic materials, <br /> or materials constituting a fire hazard in a manner designed to prevent contamination of <br /> ground or surface waters. A contingency plan has also been developed to prevent sustained <br /> combustion of flammable materials (Rule 4.14.3(1)(a)). <br /> 6. The Division approved the method and design specifications for covering of acidand <br /> toxicforming materials in order to prevent leaching into surface and ground water and to <br /> ensure backfill stability Rule 4.14.3(2)). <br /> XIII. Revegetation -Rule 4.15 <br /> The Permit was found to be in compliance with Rule 4.15. <br /> A. Baseline Vegetation Information <br /> Baseline vegetation information is found in Section 2.04.10, Exhibit 10 and Maps 3 and 4 of the PAP <br /> (Volume I for the East Pit, West Pit, Section 16 Pit, Facilities Area and Gossard Loadout;Volume 12 <br /> for South Taylor Pit; Volume 15 for Collom Pit). A summary of this information is found in the <br /> section of this document entitled"Description of the Environment." <br /> Mountain Shrub and Sagebrush communities are the dominant vegetation types throughout the <br /> original permit area. Mountain Shrub is the dominant community in disturbed areas associated with <br /> the South Taylor Pit and Collom Pit, with lesser but significant acreages of Sagebrush and Aspen <br /> Woodland communities. Communities of minor extent include Bottomland and Grassland. The <br /> same mix of communities occurs in the Lower Wilson expansion area, along with small areas of <br /> Juniper Scrub and Cropland. <br /> B. Plant Establishment <br /> Colowyo will establish a diverse, effective and permanent vegetative cover such as is necessary <br /> 47 <br /> Permit Revision No.5(PR-05),G 1981-019 <br />