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' S.0 Occurrences of Potential A1~luvial Valley Floors <br />Areas examined for potential AVF's include [he drainages of the mine plan <br />area and [he flood plains of the Yampa and Williams Fork rivers. <br />5.1 Mine Plan Area <br />The Trapper Mine mine plan area was examined for potential AVFs on the <br />basis of geology, soils water availability,.and land use. <br />The Colorado State Geologic map of Moffat County (Miller 1977) was <br />reviewed for presence of quaternary alluvial deposits. No such deposits <br />were mapped on the mine plan area (Exhibit V). <br />• <br />Peters (1980) conductd an order 1 soil survey of the mine plan area and <br />found no AVF's. A map delineating the soil types and description for <br />these soil types of the mine plan area is found in Appendix B.(1) In <br />i <br />drainage bottoms, soils were often not sufficiently different from those <br />on hillsides to warrant separate mapping units. In areas where soils were <br />mapped in association with drainage bottoms, parent material was termed <br />both colluvial and alluvial. This indicates a mixture of these materials <br />where the alluvial materail is transported mainly by slopewash (personal <br />communications, Jeff Peters 1980). Johnson Gulch has a small area of a <br />cumulic soil type which exhibits layering [ha[ is associated with water <br />(1) This information is now included in Section 2.6 of [his permit appli- <br />cation and Map No. M29. <br />-42- <br />