2021-03-15_REVISION - C1981044 (2)

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topsoil to a minimum depth of six inches. Vegetation success criteria for pre 1978 (prelaw), area entails limited vegetation sampling that includes a qualitative description. A diverse and permanent vegetation cover, capable of self-generation, comprised of species native to the area, and at least equal in extent of cover to pre mining vegetation shall be achieved. The premining cover standard for the pre law area of the Strip Pit is understood by the permittee to be 30% or greater,based on the 1983 cover sampling period and one year of sampling. Additionally, a letter from the Soil Conservation Service stating that post mining land use criteria has been met is required. These areas will be deemed successfully revegetated when the cover of these areas is 30%or greater. Regarding the"post law" (land affected after May 3, 1978), a reference area was established (reference area B),to evaluate revegetation success. Vegetative cover is considered successful for this portion of Williams Fork Mine Strip Pit when cover in the reclaimed areas is not less than 90% of the cover in reference area B,with a 90% statistical confidence for lands affected after May 3, 1978. The Utah Tract, formally part of the Trapper Mine permit was regarded, topsoiled, seeded and mulched between 1979 and 1983. When this area was acquired by MCM's predecessor company(RAG),the acquisition included assumption of reclamation responsibility,revegetation success and bond release. The approved reclamation plan for the Utah Tract calls for replacement of topsoil to 12 inches or more. MCM utilizes a technical standards for cover and production on the Utah Tract Range Site A area. Reference area 3 was sampled to provide cover and production data for comparison with Range Site B.As discussed in section 2.05.4 and Exhibit 14a of the PAP, reclaimed parcels are compared to three different range standards based on elevation. The Utah Tract has two different range sites designated as follows: 1. Range site A standards apply to elevations greater than 7200 feet 2. Range site B standards apply to elevations between 6700 and 7200 feet. For Range Site A,vegetative cover will be acceptable when the site achieves at least 33%herbaceous cover plus 19%litter, and a total allowable cover value of at least 52%. These technical standards were developed for Range Site A from range site estimated pre and post mining soil loss,based on the lowest percent cover from premine areas. Reclaimed Range Site B will be deemed successful through comparison with the reference area parameters. Phase III Bond Release Vegetation success criteria for pre the 1978 (prelaw), area in the Strip Pit entails limited vegetation sampling that includes a qualitative description. Quantitative production,woody plant density and species density performance standards are not required in pre law areas. Permit Number C1981044 Page 11 of 25