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• Map Unit Descriptions <br />Aquolls, Sandy-Skeletal, 1 to 12 Percent Slopes <br />This unit consists of moderately deep to deep, poorly drained soils on <br />terraces and valley bottoms. The soils formed in alluvial materials <br />from mixed mineralogy parent materials. <br />This unit occurs in the floodplain along both sides of the Roaring <br />Fork River. Disturbance of this soil by mining activities will not be <br />too significant, It is crossed by the conveyor overhead and disturbed <br />only by a small construction area for a conveyor support structure <br />(bent ), <br />Included in this unit are small areas of deeper cumulic soils in the <br />convex portions, all having slopes of 3 to 12 percent. <br />• Typically the surface layer is black loam about 8 inches thick. The <br />subsurface is dark brown loam to sandy loam about 20 inches thick. <br />The substratum is gravelly and cobbly sandy loam to loamy sand that <br />extends below 60 inches. This is an "average" profile; because of <br />extensive reworking by water (fluvaquentic character), surface and <br />subsurface textures and soil depths are variable. Our sample is typi- <br />cal in depth and texture for the specific areas mapped in this report. <br />Permeability is moderately rapid. Effective rooting depth is 15 to 25 <br />inches. Available water holding capacity is 0.12 to 0.17 inches per <br />i inch. Organic matter content in the surface layer is high. Surface <br />runoff is slow and erosion hazard is slight. <br />These soils have a high water table and are subject to frequent <br />flooding, and thus are severly limited for urban development. <br /> <br />3-115 <br />