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established not less than the ground cover, which existed before redisturbance. <br />The portion of the No. 5A portal area sampled during September 1983 will be used as the success standard for the red <br />rock crusher site. Baseline vegetation data is discussed in Section 2.04.10 Vegetation Information under the heading <br />of Ve eta Sampling. The study conducted in September 1983 revealed that mean ground cover of perennial <br />grasses, Forbes, and shrubs was 32.5 percent. Therefore, this area will be successfully revegetated when ground cover <br />reaches 33 percent and no erosion problems are noted. <br />Utah Tract <br />MCM is responsible for reclaiming the area known as the Utah Tract depicted on Map 20, Vegetation Map. This area <br />was originally mined and reclaimed by Trapper Mining, Inc. Trapper has designated two different range sites within <br />the Utah Tract. However, within the immediate area adjacent to the Utah Tract, three range sites, as defined by <br />Trapper Mining, are identified; the distinction between the range sites is based upon elevation. Range Site A is <br />associated with areas located above 7,200 feet, Range Site B is located between 7,200 feet and 6,700 feet, and Range <br />Site C is located below 6,700. The following tables identify species associated with these three range sites. <br />The Utah Tract is traversed by range sites A and B. The previous success criteria established for the Utah Tract <br />focused on comparisons made between the individual reclaimed range site and its associated reference area. The <br />reference area for Range Site A is located within the south central portion of the N/2 SW/4. Section 2, T5N, R91 W <br />(reference site 5) and the extreme northwest portion of the SEA SW/4, Section 30, T6N, R91W (reference site 6). <br />Reference Sites 5 and 6 are located on Map No. M17, Vegetation Available for Domestic Grazing Under Utah <br />Surface Control, of the approved Trapper Permit, No. C-010-81. The reference site for Range Site B (reference area <br />3) is shown on RAG Empire's Map No. 20, Vegetation. <br />In lieu of a reference area comparison,(effective TR16-37) the ground -cover technical standards for Range Site A and <br />B developed by and approved for the Trapper Mine will be used for comparison to Utah Tract Range Site A and B, <br />respectively. The following methodology will be used to evaluate the reclaimed sites relative to their corresponding <br />reference area or technical standard, as applicable. <br />Revegetation of the reclaimed sites will be deemed successful when measurements of reclaimed allowable cover <br />and/or herbaceous production are at least 90 percent of the cover and/or production values for the reference area with <br />90 percent statistical confidence (CDMG 2005 revised rule, 4.15.11 (2)(a)). If total allowable cover and/or <br />herbaceous production on the revegetated area are determined to be less than 90 percent of the cover and/or <br />production values for the reference area with 90 percent statistical confidence, a one -tailed 'T' test will be performed <br />to determine if there is a statistically significant difference. Based on this test, revegetation will be deemed successful <br />when the calculated 'T' is less than or equal to the 'T' value from the one -tailed 'T' distribution table. The following <br />equation, which is from page 22 of the DMG Vegetation Guidelines, will be used to evaluate vegetation success. <br />to = Q=x <br />S, <br />Where: Q = 90% of the standard <br />X = Bond release block sample mean <br />S, = Standard error of the mean (sin) <br />s = Sample Standard deviation <br />n = Sample size <br />t, = Calculated t value <br />TR16-37 2.05-35 Revised 12/23/16 <br />