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REV103458
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REV103458
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Entry Properties
Last modified
8/25/2016 1:14:18 AM
Creation date
11/22/2007 1:07:09 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980004
IBM Index Class Name
Revision
Doc Date
4/3/2006
Doc Name
Completeness Letter & Enclosures
From
DMG
To
OSM
Type & Sequence
TR15
Media Type
D
Archive
No
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Biological Assessment for DMG Permit Renewals McClane Canyon & Munger Canyon Mines <br />Surface disturbance directly affects approximately 3 acres of semi-desert shrublands associated <br />with East Salt Creek, and includes one bridge crossing of East Salt Creek. The remaining 6.5 <br />acres of surface disturbance directly affects semi-desert shrublands in McClane Canyon's <br />ephemeral drainage, and includes two culvert crossings of the drainage. <br />4.2 Munger Canyon Mine Assessment Area <br />The Munger assessment area is the 1,023-acre Proposed Munger Permit Boundary area <br />described in Section 3.2 and depicted on Figure 2. Most of the assessment area is undisturbed <br />pinyon-juniper woodland or mixed montane shrublands in topographically complex canyon and <br />ridge country. The soils in the assessment area derive primarily from the Upper Cretaceous <br />Mesaverde Formation (Figure 3), whose outcrops are visible in narrow cliff bands and ledges <br />throughout the assessment area (Photopoints 6 through 9; locations keyed to Figure 4). The <br />approximately 17 acres of permitted surface disturbance includes a gravel access road crossing <br />an approximately 0.3-mile stretch of the East Salt Creek riparian corridor and semi-desert <br />shrublands (Photopoint 5) with one bridge crossing of East Salt Creek, then extends <br />approximately 1.3 miles up Munger Creek, and an additional 0.4 miles up a Munger Creek side <br />canyon (Figure 2). <br />Elevations in the Munger assessment area range from approximately 5,300 feet at the <br />intersection of the access road and SH-139 to approximately 7,000 feet at the east boundary. <br />Within the area of permitted surface disturbance, elevations range from 5,300 to about 5,800 <br />feet (Figure 2). Average annual rainfall in the assessment area ranges from 10 to 25 inches, <br />and average annual low and high temperatures are 31°F and 62°F (Garfield County Planning <br />Commission 2002). <br />~~ <br />East Salt Creek flows year-round although its flow regime along this stretch is affected <br />significantly by seasonal precipitation and spring runoff. Dominant vegetation in the East Salt <br />Creek corridor consisted of greasewood, big sagebrush, coyote willow, tamarisk, and Rio <br />Grande cottonwood. Cottonwoods were confined to the creek's channel banks, were small in <br />stature, and scattered. Thickets of dense tamarisk and willow or greasewood occupied channel <br />banks, grading into stands of pure greasewood across the floodplain, and eventually to big <br />sagebrush near the floodplain-canyon side-slope transition. Shrub canopy cover across the <br />floodplain was greater than 50 percent. <br />Munger Creek and canyon bottoms support a narrow ephemeral drainage dominated by <br />greasewood and big sagebrush, grading into sparse Gambel oak, serviceberry, sagebrush, and <br />pinyon-juniper farther up the drainages. North-facing canyon slopes supported pinyon-juniper <br />woodlands with a mixed shrub understory dominated by big sagebrush, serviceberry, and an <br />occasional shadscale shrub. Cheatgrass was present in the understory, especially at the fringes <br />of the permitted area of surface disturbance. Indian ricegrass, needle-and-thread, and other <br />native bunchgrasses were present. Steep, south-facing canyon slopes supported shadscale, <br />scattered small junipers, cheatgrass, and native bunchgrasses observed on north-facing slopes. <br />Bare soil, steep rock faces, and ledges were typical of the canyon slopes, especially on higher <br />elevation south-facing slopes. Rock surfaces were pocked and fissured, providing crevices, <br />ledges, and pockets for wildlife roost or nest sites. <br />Surface disturbance directly affects approximately 1.5 acres of semi-desert shrublands <br />associated with East Salt Creek, and includes one bridge crossing of East Salt Creek. Surface <br />disturbance directly affects approximately 5 acres of semi-desert shrublands associated with <br />Munger Creek and includes 2 culvert crossings of Munger Creek and one culvert crossing of a <br />March 27, 2006 7 Rare Earth Science, LLC <br />
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