2009-08-13_PERMIT FILE - C1981019A (4)

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RULE 2 PERMITS • square meter. Perennial forbs produced 79.5 gams per square meter, one-flowered helianthella produced 19.5 gams per square meter and silvery lupine produced 16.8 gams per square meter. Other miscellaneous perennial forbs produced 32.3 gams per square meter. Annual forbs produced 21.6 gams per square meter. Total above Bound herbaceous production in the reference azea was significantly Beater than that of herbaceous production in study azea samples. Total shrub density within the mountain shrub vegetation type was 53.9 individual shrubs per 50 square meters. Western snowbeny was the most abundant shrub with 31.9 individuals per 50 square meters followed by Gambel oakbrush with 11.4 and serviceberry with 4.6 individuals per 50 square meters. The mean number of species encountered along the 50 meter point cover transect was 9.5 and 14.9, respectively, for the study area and reference area samples (Table 3.5 of Exhibit 10, Item 5). Average herbaceous production in the mountain shrub Type was 1,351 lbs. /acre oven-dry forage. Converting oven to air-dry forage by a factor of 1.11, yields 1,500 ]bs. /acre available herbaceous air-dry forage. Assuming a 50 per cent utilization factor and 900 lbs. /acre cattle animal unit, the cattle carrying capacity was 0.83 AUM's per acre. For sheep the carrying capacity was 5.00 AUM's per acre. Saa_ebrush-Grassland -The sagebrush-gassland vegetation type occurred on the lower elevations of the study area on ridges and southeast and southwest facing slopes. The majoriTy of the type occurred north of West Fork. The sagebrush-gassland Type within the study area was quite variable and several phases of the type were noted. The most abundant phase was the sagebrush-snowberry phase (Figure 3.5 of Exhibit 10, Item 5). This phase occurred on the deeper soils and had an understory composed primarily of Kentucky bluegass, subalpine needlegass, Letterman needle-Bass, nodding brome and slender • wheatgass. In section 15, the mountain shrub vegetation type has been converted to a sagebrush- snowbeny phase by mechanically removing all the large shrubs. In these areas, snowberry was more common than sagebrush. The sagebrush-bluebunch wheatgass phase occurred on shallow soils usually on steep terrain (Figure 3.6 of Exhibit 10, Item 5). This type primazily occurs near Highway 13 along Good Spring Creek. Study sites 18, 19, 21 and 25 are representative of this phase of the sagebrush gassland type. Bluebunch wheatgass was the dominant Bass species within this phase. A gassland phase of the sagebrush-gassland occurred on thin scabby sites located on ridgetops primarily in sections 30 and 29 north of West Fork (Figure 3.7 of Exhibit 10, Item 5). Here the phase occurred on southwest facing slopes. These sites have served as bedding areas for sheep and cattle and are subject to intense gazing. Sites 1, 23, 14 and 2 are representative of this phase. Grasses are the dominant goup within this phase, with needle-and-thread, western wheatgass, and prairie junegass being common. Shrub density within the type is exceedingly low. Douglas rabbitbrush was the dominant shrub. The sagebrush- gassland (Artemisia nova) phase occurs on one ridge within the study area, in sections 30 and 19 (Figure 3.8). This phase has a distinct dominant shrub layer of black sagebrush. Otherwise gasses were similar to that of the gassland phase of the sagebrush gassland type. No plots were randomly located within this phase. In several azeas neaz sections 15 and 16, range improvements have been made which have altered the vegetation. The large shrubs have been removed to allow the understory species to be more productive. The practice has removed most of the serviceberry and in the process, most of the sagebrush. Snowberry dominates these sites with numerous gasses and forbs (Figure 3.9 of Exhibit 10, Item 5). Absence of gazing for the past four years in section 11 was another factor contributing to the variability within the sagebrush-gassland type. This area is controlled by the Colowyo mine and is within their fenced perimeter boundary. Samples sites 4, 5, 12, and 16 were within this area. All samples from the vazious phases were pooled for the sagebrush-gassland analysis. The sagebrush-gassland reference area was located in section 30 on asouth-facing slope at an elevation of 8,040 feet. Total vegetation cover within the sagebrush-gassland type from study area samples was 59.3 percent (Table 3.7 of Exhibit 10, Item 5). Baze Bound exposure was 12.5 percent while rock and litter combined South Taylor/Lower Wilson -Rule 2, Page 67 Revision Date: 1 /3 I /07 Revision No.: PR-02