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La Plata County Area. Colcradn <br />Management for wildlife should include protecting the <br />unit from overgrazing and other disturbances. <br />This unit is suited to homesite and urban development. <br />Gobbles and gravel in the substratum aftect excavation <br />for foundations and utility lines. Construction of sanitary <br />facilities poses a risk of polluting nearby water. This <br />limitation can be overcome by excavating and backfilling <br />with finer textured material to reduce seepage. Sewage <br />lagoons should be lined to reduce seepage. <br />This map unit is in capability subclasses Ille, irrigated, <br />and Illc, nonirrigated. <br />This deep, somewhat poorly <br />drained soil is on f ood plains and alluvial valley floors <br />(fig. t0). It formed in mixed alluvium. Tha soil is <br />63 <br />dissected by oxbows and ofd channels in many places. <br />Slope is t to 3 percent. Elevation is 6,000 to 7,500 feat. <br />The average annual precipitation is 16 to t9 inches. The <br />average annual air temperature is d5 to 53 degrees F, <br />and the average frost-free period is 105 to 130 days. <br />Typically, the upper part of the surface layer is light <br />brownish gray loam about 5 inches thick and the lower <br />part is pale brown loam and fine sandy loam about t2 <br />inches thick. The underlying material is pinkish gray loam <br />that is stratified with very fine sandy foam and find sandy <br />loam and is about 39 inches thick. Below this are sand <br />and gravel that extend to a depth of 60 inches or more. <br />In some places the surface layer is fine sandy loam. <br />Included in this unit are about 20 percent Pescar fine <br />sandy loam, about 10 percent Alamosa loam, and small <br />... ...., c.fi _•,4py4ut^F <br />Figure 70.-Area of Tefton loam that has been flooded. <br />