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West Elk Mine <br />~ble 22 Original and Current Soil Classification Designations, West Elk Mine <br />Correlating 1976, 1980, 1993, and 1994 Mapping, Cont. <br />Original* <br />Ma Unit 1950** <br />Ma Uni[ Current <br />Ma Units Agency <br />Desi nation Soil <br />Classification Soil Series or Association <br /> 225 SCS, USFS Herm-Fu es com lex <br /> 226 SCS,USFS Herm-Fughes-Kolob <br />Famil com lex <br /> 227 SCS,USFS Broad Canyon-Scout <br />Famil com ]ex <br /> 229 SCS,USFS C ochre is-C oborolls-Rubble <br /> 230 SCS,USFS Haploborolls-Ustocluepts-Rock <br />outcrop <br /> 236 USFS Shawa-Sandia Family- <br />Kolob Famil com lex <br /> 240 SCS,USFS Fughes-Curecanti stony <br />loam <br /> 250 SCS,USFS <br /> 302 SCS,USFS Cumulic Ha loborolls <br />` Original map designations from 1976 survey. <br />" Additional map units from 1960 survey. <br />Drainage <br />• Most of the soils of the study area are well drained. Only units 20 and 27 have any limitations in this <br />regard and both occur over very small acreage. Unit 20 in its natural state is poorly to somewhat <br />poorly drained with water tables at or within two feet of the ground surface most of the year. Its <br />degree of drainage is poor enough so that it influences the type of native vegetation. It is an <br />important factor in regulating stream flow in the late summer months and as sources of water for <br />wildlife. <br />Flood Hazard <br />Units 20, 26, X26, 27, and 300 are particularly susceptible to frequent overflow. Most of the other <br />soils of the area may at times of heavy rainfall receive some runoff, but flood waters concentrate in <br />areas of the units listed above making them particulazly susceptible to flood damage. <br />Units 20, 26, and X26 occur on the floor and sides of small upland drains and smaller streams where <br />excess water from surrounding slopes concentrates in periods of intense runoff. Units 27 and 300 <br />occur on the floodplains of the North Fork of the Gunnison River. Though annual flooding of these <br />azeas no longer occurs due to upstream dams, some flood damage potential still exists. <br />Mass Movement <br />Some soils on steep slopes of the West Elk Mine study azea aze subject to some mass movement. <br />However, these soils are not associated with the location of surface facility foundations. Such <br />2.04-133 1/94 PRt15; 8/94 TR77; Revised Jun. 1995 PR06, /1/04 PRIG <br />