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• surface discharge, without any indication of delayed response in <br />the groundwater system. <br />5.1.4.6 Soils <br />Soils information is not available for Alkali Creek, but soils in <br />this area should be similar to those north of the hogback, except <br />possibly sandier. <br />5.1.4.7 Subirrigation <br />Subirrigation along Alkali Creek is limited to land immediately <br />adjacent to the creek. Vegetation outside the active channel <br />receives its water from surface irrigation and/or by precipitation. <br />5.1.5 South Canyon Creek <br />5.1.5.1 Unconsolidated Sediments <br />Because South Canyon Creek is perpendicular to the structural <br />fabric of the area, as opposed to being parallel as are Alkali <br />Creek and the Colorado River, the geomorphic characteristics of <br />this drainage are quite different than the other two drainages. <br />The valley of South Canyon Creek is relatively narrow and steep- <br />sided. The widest portion of the valley is in an area of Mancos <br />Shale, which is easily eroded. In contrast to the other two <br />drainages, alluvial sediments along South Canyon Creek are <br />relatively thin, narrow, and discontinuous in areas of exposed <br />bedrock. Because of their limited extent, alluvial contacts were <br />not drawn on Figure 5.1-1. <br />5.1.5.2 Monitoring <br />Because this drainage is outside any planned disturbed areas, <br />. monitoring has not been required. <br />NCEC - Coal Ridge #1 5-7 ABC/1145/900301 <br />