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GENERAL32632
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Last modified
8/24/2016 7:55:04 PM
Creation date
11/23/2007 7:22:20 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981071
IBM Index Class Name
General Documents
Doc Date
3/27/1997
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR RN3
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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3. Wolf Creek Coal (11-21') - variable sulfur, sub-bituminous coal to be <br />mined in the eastern part of the proposed Little Middle Creek tract; <br />4. Wolf Creek Overburden (approximately 160') - predominantly sandstone and <br />siltstone with interbedded claystone and shales; <br />5. Wadge Coal (7-11.5') - low-sulfur, sub-bituminous coal to be mined in the <br />western portion of the permit area; <br />6. Wadge Overburden (60-90') - interbedded, sandstones, siltstones and <br />shales; <br />7. Lennox Coal (0-2') - discontinuous coal seam; <br />8. Lennox Sandstone (0-10') - discontinuous, lenticular sandstone; <br />9. Lewis Shale (approximately 700') - massive, marine shale; and, <br />10. Twentymile Sandstone (100-200') - massive, white sandstones. <br />The bedrock is mantled on hill slopes by quaternary colluvial deposits, <br />especially at the base of scarp slopes. Alluvial deposits exist along Foidel <br />Creek. Alluvial deposits are present in the lower reaches of Foidel Creek and <br />at the confluence of Foidel and Middle Creeks. Alluvial deposits are also <br />present along Fish Creek, Middle Creek and Trout Creek. <br />The stratigraphy and geologic structure within the Twentymile Park Synclinal <br />Basin control the ground water flow in the basin. The three regional bedrock <br />aquifers that are present within the basin are the Trout Creek sandstone, the <br />Twentymile sandstone, and the Wadge coal-overburden aquifer. All three <br />aquifers exhibit artesian heads in the central part of the Twentymile Park <br />Basin. The water quality in all three aquifers is moderately poor but is <br />potable and is used for mining, irrigation and domestic purposes. <br />Ground water flow in the aquifers moves downdip toward the center of the <br />basin, controlled by the geologic structure. Faults may have higher hydraulic <br />conductivities and may allow vertical flow to occur between aquifers which are <br />displaced. Pump tests performed near faults indicate that fault zones act as <br />barriers to horizontal ground water flow. <br />Aquifer recharge occurs along the edges of the Twentymile Park Basin where the <br />rocks crop out. Recharge is primarily by direct infiltration where the <br />aquifers are exposed while secondary recharge is provided by deep percolation <br />of water through overlying strata. <br />Two broadly classified soil complexes exist within the proposed permit area. <br />These are topic Paleoborolls - Borollic Camborthids and Argic Cryoborolls - <br />Cryic Paleoborolls. The former complex consists primarily of clayey, well <br />drained soils developing in place from soft shales. These soils are used for <br />cropland, pastureland and rangeland, with native vegetation consisting <br />primarily of big sagebrush and mountain shrub communities. These soils occur <br />primarily in the Mine 2 area, and lower slopes of Mine 1 and Eckman Park. The <br />latter complex consists of moderately deep to deep, well drained loamy soils <br />formed from sandstone and shale on mountain sides and ridges. These soils are <br />used almost exclusively as rangeland and wildlife habitat, supporting native <br />vegetation communities including mountain shrub, big sagebrush and aspen. <br />These soils occur predominately within Eckman Park. <br />-7- <br />
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