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West E!k Mine • Table 22 Original and Current Soil Classification Designations, West Elk Mine Correlating 1976,1980,1993, and 1994 Mapping, Cont. 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 Het7tt-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-Curecantistony loam 250 SCS,USFS 302 SCS,USFS CumulicHaploborolls ' Originalmap designations from 1976 survey. Additionalmap 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 watets 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 sursounding 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. • 2.04-132 J/94 PRO5; 8/9477!71; Revised tort. J995 PR06