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• concern in installing septic tank absorption fields. Absorption lines should <br />be installed on the contour. <br />If the Moyerson soil is used for homesite development, the main limita- <br />tions are depth to bedrock, slope and shrink-swell potential. Excavation for <br />building sites is limited by the bedrock. If buildings are constructed on <br />this soil, properly designing foundations and footings and diverting runoff <br />away from buildings help to prevent structural damage because of shrinking and <br />swelling. The effects of shrinking and swelling can be minimized by using <br />proper engineering designs and by backfilling with material that has low <br />shrink-swell potential. <br />This map unit is in capability subclass VIIe. It is in Deep Clay Loam <br />range site. <br />23A--Gapo clay loam, 0 to 3 percent slopes. This deep, poorly drained <br />soil is on flood plains. It formed in mixed, alluvium. Elevation is 6,100 to <br />• 8,000 feet. The average annual precipitation is 15 to 20 inches, the average <br />annual air temperature is 37 to 40 degrees F, and the frost-free season is 40 <br />to 65 days. <br />Typically, the surface layer is dark gray clay loam. The underlying <br />material is stratified light gray to dark grayish brown clay extending to <br />60 inches or more. <br />Included in this unit are small areas of Milren loam and Venable loam. <br />Permeability of this Gapo soil is very slow. Effective rooting depth is <br />60 inches or more. Available water capacity is moderate. Runoff is slow, and <br />the hazard of water erosion is slight. <br />This unit is used for irrigated hay and nonirrigated winter wheat and <br />spring barley. <br />• This unit is well suited to irrigated hay. It has few limitations. <br />Fertilizer is needed to insure optimum growth of grasses and legumes. To <br />Ex. 16-24 <br />