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<br /> <br />This unit is about 55 percent Limon soil and about 35 percent Gaynor soil. The Limon <br />soil is on foot slopes and draingeways, and the Gaynor soil I on side slopes and foot slopes. <br />Included in this unit is about 10 percent shallow Midway clay loam on upper side slopes. Also <br />included are 1 to 5 percent gullies, ranging generally 8 to 15 feet in depth. <br />The Limon soil is deep and well drained. It formed in alluvium derived dominantly from <br />shale. Typically, the surface layer is brown silty clay loam about 3 inches thick. The substratum <br />is silty clay about 43 inches thick over shale at a depth of 46 inches. The soil is moderately <br />alkaline. <br />Permeability of the Limon soil is slow. Available water capacity is moderate. Effective <br />rooting depth is 40 inches or more. Runoff is rapid to very rapid, and the hazard of water erosion <br />is high to very high. <br />The Gaynor soil is moderately dep and well drained. It formed in alluvium and residuum <br />derived from shale. Typically, the surface layer is grayish brown silty clay loam about 4 inches <br />thick. The substratum us silty clay about 26 inches thick over sofr, weathered shale. The soil is <br />moderately alkaline. <br />Permeability of the Gaynor soil is slow. Available water capacity is low. Effective <br />rooting depth is 20 to 40 inches. Runoff is rapid to very rapid, and hazard of water erosion is <br />high to very high. <br />When these soils dry, cracks form that aze %z to 12 inch wide and 4 to 12 inches deep. <br />This unit is used for rangeland. <br />The potential plant community on the Limon soil is mainly alkali sacaton, blue grams, <br />western wheatgrass, and fourwing saltbush. The average annual production of air-dry vegetation <br />is about 800 pounds per acre. If the condition of the range deteriorates, fourwing saltbush, black <br />greasewood, and blue grams increase. <br />The potential plan community on the Gaynor soil is mainly alkali sacaton, blue grams, <br />and western wheatgrass. The average annual. Production of air-dry vegetation is about 800 <br />pounds per acre. If the condition of the range deteriorates, western wheatgrass, fourwing <br />saltbush, shadscale, and franl: bush increase. <br />Livestock grazing should be managed to protect the unit from excessive erosion. If the <br />plant cover is reduced, protection is needed to control gullying, streambank cutting, and sheet <br />erosion. Loss of the surface layer results in a severe decrease in productivity and in the potential <br />of the unit to produce plants suitable for grazing. The main limitations for seeding aze the poor <br />tilth of the natural topsoil and the shallow wetting of the soils by natural precipitation. <br />If this unit is used for homesite development, the main limitations aze slow permeability <br />and high shrink-swell capacity of the soils. Depth to shale is also a significant limitation of use <br />of the soils as septic tank absorption fields where depth is less than about 40 inches. <br />The effects of shrinking and swelling can be reduced by maintaining a constant moisture <br />content around the foundation. Foundations and bearings walls should be designed to offset the <br />effects of shrinking and swelling. Backfilling the excavation with material that has low shrink- <br />swellpotential can also reduce the effects of shrinking and swelling. Septic taril: absorption <br />fields of conventional size do not function adequately because of the slow permeability of the <br />soil. Other kinks of sewage disposal systems may be needed. Preserving the existing plant cover <br />during construction helps to control erosion. <br />This map unit is in capability subclass Vle, non-irrigated. It is 60 percent Salt Flat #34 <br />range site and 40 percent Shaly Plains #46 range site. <br /> <br />