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2021-09-03_PERMIT FILE - C1981019A (8)
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2021-09-03_PERMIT FILE - C1981019A (8)
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Last modified
5/10/2023 2:22:44 PM
Creation date
4/27/2022 2:26:16 PM
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Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
9/3/2021
Doc Name
Permits
Section_Exhibit Name
Volume 15 Rule 2
Media Type
D
Archive
Yes
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RULE 2 PERMITS <br /> 'c2&.'''F 4PN :JL4:t 'CrrwN.:4's, 3- ..-a. z ;b.:o.r¢•c„icr.�ks�c.4 *we&<}x<rta::�:•\*WW.a>:x,»b..nr1!' ^t;swWoRt,b4AW,tk+ '7.P 4. ..m"ae <br /> contributing 37 pounds per acre). Noxious weeds were not found in any of the sampling quadrants in the <br /> sagebrush reference area(Table 2.04.10-69). <br /> Woody plant density in the sagebrush reference area was 3,275 woody plants per acre with dominance by <br /> mountain big sagebrush (1,679 plants per acre) and low rabbitbrush (1,541 plants per acre). The shrub <br /> lifeform accounts for 100 percent of the total(Table 2.04.10-70). <br /> The comparison of the calculated t-statistic (t*) for the sagebrush community baseline study area and the <br /> sagebrush reference area with the respective tabular t values indicates that in each case t* is less than t. <br /> So, it can be concluded that the total vegetation ground cover and production for the sagebrush <br /> community baseline study area is comparable(equal)to the values obtained from the sagebrush reference <br /> area(Table 2.04.10-38). <br /> Minor Vegetation Communities <br /> Improved Pasture - As indicated on Map 4, a single developed field of improved pasture (23.5 acres) <br /> occurs in the southeastern portion of the study area where a relatively flat bench of shrubland/forest was <br /> cleared and planted primarily to smooth brome (Bromus inermis) and thickspike wheatgrass (Agropyron <br /> dasystachyum). <br /> A reference area for improved pasture (11.1 acres) was established along lower Morgan Creek northwest <br /> and external to the study area boundary (Map 4). This reference area was selected because of its <br /> elevation, ease of access, low probability for future disturbance, and representation of early mine <br /> reclamation (1970 - 1990) at the existing Colowyo operation. Mine revegetation from this period <br /> typically included "improved" varieties or genotypes of both introduced and native species that exhibit <br /> better germination, larger growth form, and/or have more efficient nutrient uptake. <br /> A total of 12 plant species were observed within the reference area. No sensitive species were observed. <br /> Two noxious weed species were observed,Canada thistle and whitetop(Table 2.04.10-34). <br /> The average vegetation cover within the reference area was 74.0 percent, with 0.0 percent rock, 19.6 <br /> percent litter, and 6.5 percent bare ground exposure. Dominant species and their ground cover percentage <br /> included: smooth brome (57.1 percent), crested wheatgrass (Agropyron cristatum) (8.4 percent), and <br /> povertyweed (3.2 percent). Of the total plant cover 99 percent (73.5 percent average cover) was due to <br /> perennial plants (excluding noxious weeds). Annual species contributed 0.6 percent and noxious weeds <br /> contributed 0.1 percent of the composition. Four perennial species contributed at least 3 percent relative <br /> cover or composition (3 percent is the typical lower limit for plant diversity bond release evaluations), <br /> three of those species being grasses and one forb(Table 2.04.10-71). <br /> The average herbaceous production within the improved pasture reference area was 1,476 pounds per <br /> acre, oven-dry weight, with 99 percent (1,472 pounds per acre) due to perennial species (grasses <br /> contributing 1,453 pounds per acre and forbs contributing 18 pounds per acre), and less than 1 percent <br /> due to annuals (grasses contributing 3 pounds per acre and forbs contributing 0 pounds per acre). The <br /> remaining 0.1 percent(1.3 pounds per acre)was comprised of noxious weeds(Table 2.04.10-72). <br /> Woody plant density in the improved pasture reference area was 6.7 woody plants per acre with <br /> dominance by rubber rabbitbrush(4 plants per acre). Shrubs accounted for 100 percent of the total woody <br /> plant density(Table 2.04.10-73). <br /> Cu ltivoteil Land(Cropland) - As indicated on Map 4, the dry-land "ropland minor community occupies <br /> 68.5 acres and is located in the northeast corner of the study area next to the coal loadout and railroad <br /> Collom—Rule 2,Page 57 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />
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