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• footings and diverting runoff away from buildings help to prevent structural damage because of shrinking and swelling. Septic tank absorption fields do not function properly because of very slow permeability. Use of sandy back- fill for the trench and long absorption lines helps to compensate for the very slow permeability. Effluent from septic tank absorption fields can surface in downslope areas and thus create a hazard to health. This sail is subject to slippage if it becomes saturated. This map unit is in capability subclass VIIe. It is in Claypan range site. X10F--Abor-Moyerson association, 25 to 65 percent slopes. This map unit is on hillsides and ridge crests. They farmed in residuum weathered from shale. Elevation is 6,300 to 7,000 feet. The average annual precipitation is about 15 to 17 inches, the average annual air temperature is about 41 to 43 degrees F, and the frost-free season is 75 to 95 days. • This unit is 55 percent Abor soil and 35 percent Moyerson soil. Included in this unit are small areas of Bulkley silty clay loam, and small areas with- stones on the surface. The Abor soil is moderately deep and well drained. It formed in residuum derived from shale. Typically, the surface layer is brown silty clay loam about 10 inches thick. The subsoil is pale brown silty clay loam about 10 inches thick. The substratum is pale brown silty clay about 8 inches thick. Partially weathered shale is at a depth of 28 inches. Permeability of the Abor soil is very slow. Available water capacity is low. Effective rooting depth is 20 to 40 inches. Runoff is rapid, and the hazard of water erosion is high. The Moyerson soil is shallow and well drained. It formed in residuum derived from shale. Typically, the surface layer is light brownish gray silty clay loam about 2 inches thick. The upper part of the underlying material is • light brownish gray silty clay loam about 3 inches thick. The lower part of Ex. 16-22