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SOIL PROFILE DESCRIPTIONS <br />• <br />Profile descriptions are included in Appendix A of this exhibit <br />and were used to obtain information on topsoil stripping depths. <br />However, they are described for soil series only. Therefore, <br />profile descriptions for soil associations are obtained by using <br />the description of each soil series that makes up the association <br />(USDA 1977). <br />There are no profile descriptions for mapping units AW, RLS, or <br />RLX. These are recently formed soils that have not had enough <br />time to develop distinguishing physical properties or horizonation. <br />SUITABILITY AND STRIPPING DEPTHS <br />Topsoil suitability ratings are based on a combination of general <br />soil characteristics which are apparent in the field and physical <br />• and chemical characteristics obtained through analysis of collected <br />samples. Wyoming Department of Environmental Quality, Land Quality <br />Division, Guideline No. 3 (Table I-1) was used as a reference in <br />determining the suitability of those soils examined (Anon. 1976). <br />This guideline provides a means for determining soil suitability <br />based on chemical and physical characteristics of the soil, but <br />does not consider such factors as soil structure and the percentage <br />of coarse fragments (channery material). Tables I-2 and I-3 present <br />topsoil suitability ratings and those factors considered to be <br />limiting to suitability in each mapping unit. <br />Topsoil stripping depth is that depth to which soils are considered <br />suitable as a plant growth medium. This determination is based <br />primarily upon profile descriptions and examination in the field, <br />although under some circumstances the results from chemical and <br />physical analysis became a very important factor in this determi- <br />• nation. Stripping depths are presented in Tables I-2 and I-3. <br />I-20 <br />