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• If this unit is used for homesite development, the main limitations are <br />shrink-swell potential and very slow permeability. If buildings are <br />constructed on the soil in this unit, properly designing foundations and <br />footings and diverting runoff away from buildings help to prevent structural <br />damage because of shrinking and swelling. Septic tank absorption fields do <br />not function properly because of very slow permeability. Use of sandy back- <br />fill for the trench and long absorption lines helps to compensate for the very <br />slow permeability. <br />This map unit is in capability subclass VIe. It is in Claypan range <br />site. <br />D10--Binco silty clay loam, 12 to 25 percent slopes. This deep, well <br />drained soil is on hillsides. It formed in residuum and alluvium derived <br />dominantly from shale. Elevation is 6,800 to 8,200 feet. The average annual <br />precipitation is 16 to 18 inches, the average annual air temperature is 37 to <br />40 degrees F, and the frost-free season is 40 to 65 days. <br />• Typically, the surface layer is grayish brown silty clay loam about <br />4 inches thick. The subsoil is grayish brown clay about 22 inches thick. The <br />substratum to a depth of 60 inches or more is light brownish gray clay. <br />Included in this unit are small areas of Milren loam and Aaberg silty <br />clay. <br />Permeability of this Binco soil is very slow. Effective rooting depth is <br />60 inches or more. Available water capacity is moderate. Runoff is rapid, <br />and the hazard of water erosion is high. . <br />Most areas of this unit are used for livestock grazing. Some areas are <br />used for nonirrigated crops, mainly winter wheat and spring barley. <br />If this unit is used for nonirrigated crops, the main Imitations are the <br />high hazard of water erosion, the short growing season, and the clayey soil <br />• texture. <br />Ex. 16-19 <br />