2022-06-13_PERMIT FILE - C1980007 (3)

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West Elk Mine 2.04-133 Rev. 01/94- PR05, 08/94- TR71, 06/95- PR06, 03/06- PR10;02/22- MR460 Original* Map Unit 1980** Map Unit Current Map Unit(s) Agency Designation Soil Classification Soil Series or Association 225 SCS, USFS Herm-Fughes complex 226 SCS,USFS Herm-Fughes-Kolob Family complex 227 SCS,USFS Broad Canyon-Scout Family complex 229 SCS,USFS Cryochrepts-Cryoborolls-Rubble 230 SCS,USFS Haploborolls-Ustochrepts-Rock outcrop 236 USFS Shawa-Sandia Family- Kolob Family complex 240 SCS,USFS Fughes-Curecanti stony loam 250 SCS,USFS 302 SCS,USFS Cumulic Haploborolls * Original map designations from 1976 survey. ** Additional map units from 1980 survey. Drainage Most of the soils of the study area are well drained. Only units 20 and 27 have any limitations in this regard and both occur over very small acreage. Unit 20 in its natural state is poorly to somewhat poorly drained with water tables at or within two feet of the ground surface most of the year. Its degree of drainage is poor enough so that it influences the type of native vegetation. It is an important factor in regulating stream flow in the late summer months and as sources of water for wildlife. Flood Hazard Units 20, 26, X26, 27, and 300 are particularly susceptible to frequent overflow. Most of the other soils of the area may at times of heavy rainfall receive some runoff, but flood waters concentrate in areas of the units listed above making them particularly susceptible to flood damage. Units 20, 26, and X26 occur on the floor and sides of small upland drains and smaller streams where excess water from surrounding slopes concentrates in periods of intense runoff. Units 27 and 300 occur on the floodplains of the North Fork of the Gunnison River. Though annual flooding of these areas no longer occurs due to upstream dams, some flood damage potential still exists. Mass Movement Some soils on steep slopes of the West Elk Mine study area are subject to some mass movement. However, these soils are not associated with the location of surface facility foundations. Such movement is difficult to predict, however, and usually is triggered by some changes in groundwater movement. It should be emphasized that the following soil units have the potential for mass movement. Moreover, not all areas mapped as a given unit have the identical potential. Thus unit 31 on a five