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Non-Technical Descriptions <br />Soil Survey Area: 121 WASHINGTON COUNTY, COLORADO <br />Map unit: 17 Colby-Norka loams, 5 to 9 percent slopes <br />Description Category: SOI <br />This map unit is on gently rolling hills. This unit consists of 45 percent Colby and 35 <br />percent Norka soils. The cromponertts are intricately mixed not allowing practical <br />separation in the field. The Colby soil is a deep, well drained soil. It formed in wi <br />nd reworked loess. The surface is a loam. The underlying material is a sift loam. This <br />soil has a moderate permeability. The available water holding capacity is high. Roots <br />penetrate to a depth of 60 inches or more. Runoff is rapid and the erosion hazard <br />due to wind is moderate. The Norka soil is a deep, well drained soil. Ii formed in wind <br />reworked loessal materials. The surtace is a loam. The subsoil is a silty clay loam. The <br />substratum is a loam extending to 60 inches or more. This soil has a moderate <br />ly slow permeability. The available water holding capacity is high. Roots penetrate to a <br />depth of 60 inches or more. Runoff is medium and the erosion hazard due to wind is <br />moderate. <br />Map unit: 5 Baca silt loam <br />Description Category: SOI <br />The Baca soil is a deep, well drained soil. It is formed in loess from mixed silty <br />materials. The surface layer is a sJt loam. The upper poRron of the subsoil is a silty <br />clay and fhe lower portion is a silty clay loam. The Baca soils have slow pertneab <br />ility. The available water holding capacity is high. Effective rooting depth is 60 inches <br />or more. Runoff is medium and the erosion hazard due to wind is moderate. <br />Map unit: 53 Paoli fine sandy loam <br />Description Category: SOI <br />The Paoli soil is a deep, well drained soil. It is formed in alluvium from mixed reworked <br />sandy and loamy material. The surtace layer is a fine sandy loam. The upper portion of <br />the underlying material is a sandy loam. The lower portion of the undedying <br />material is a sandy loam. The substratum is a stratified loamy sand and sandy loam. <br />The Paoli soils have moderately rapid permeability. The available water holding <br />capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is slow and t <br />he erosion hazard due to wind is severe. <br />Tuesday, May 16,1006 Page 1 oj2 <br />