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• No temperature distinction was made in this land type and mapping unit number 200 occurs at elevations <br />both above and below 7,800 feet (approximate 59°F mean summer soil temperature isotherm). It occurs in <br />greatest acreage below 7,800 feet elevation. Above 7,800 feet it contains a component of soils similar to <br />those described for mapping unit number 6. <br />These areas are of considerable importance in the evaluation of surface water flow and yields under <br />di[fering degrees of wetness. Runoff yields during periods of high intensity rainfall are great. <br />ManUine Unit Number 300; Land 'IWoe: Alluvial Land -This land type is used exclusively in the <br />portions of the mine area mapped by personnel of the Soil Conservation Service. It is confined to the low <br />Ooodplains adjacent to the channel of the North Fork of the Gunnison River and consists of variable <br />recent deposits of stream alluvium. Textures are usually sandy foams, foams, or clay foams but the soils of <br />the unit are strongly stratified and both finer and coarser textures occur intermittently and within short <br />distances. <br />Areas of this unit generally are only slightly above the stream channel, subject to frequent flooding, and <br />have seasonally fluctuating water tables controlled by the river stage. Some are poorly drained more or <br />less permanently by standing water tables at or near the surface. These soils occur in very small acreage. <br />Mapping Unit Number 400; Land Tvoe: Stony Alluvial Fans -This is a complex undifferentiated mapping <br />unit used only in that part of the study area mapped by personnel of the Soil Conservation Service as part <br />of the Paonia Area Soil Survey. It is described as an accumulation of deep, well drained stony and cobbly <br />sediments from a variety of rock and upland soil materials deposited on the floodplains of narrow valleys, <br />small fans, and toe slopes. It occurs along the edges of the uplands bordering the North Fork of the <br />Gunnison River and has a small total acreage in the study area. <br />• Textures are variable ranging from sandy foams to clay foams in which are embedded considerable amounts <br />of gravel, cobble, and boulders. The soils are subject [o frequent flooding and the deposition of sediments. <br />• <br />