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• the underlying material is olive shaly silty clay loam about 13 inches thick, <br />soft shale is at a depth of 18 inches. <br />Permeability of the Moyerson sail is very slow. Available water capacity <br />is very low. Effective rooting depth is 5 to 20 inches. Runoff is rapid, and <br />the hazard of water erosion is high. <br />This unit is used for livestock grazing and wildlife habitat. <br />The potential plant community on this unit is mainly mountain big sage- <br />brush, western wheatgrass, slender wheatgrass and lettermans needlegrass. <br />Other plants that characterize this site are mountain snowberry, lanceleaf <br />rabbitbrush, and bluebunch wheatgrass. The average annual production of air- <br />dry vegetation is about 2,000 pounds per acre. <br />If the range is overgrazed, the proportion of preferred forage plants <br />decreases and the proportion of less preferred forage plants increases. <br />• Therefore, livestock grazing should be managed so that the desired balance of <br />preferred species is maintained in the plant community. Management practices <br />suitable for use on this unit are proper range use, deferred grazing, and <br />rotation grazing. Slope limits access by livestock and results in overgrazing <br />of the less sloping areas. Trails or walkways can be constructed in places to <br />encourage livestock to graze in areas where access is limited. <br />If the Abor soil is used for homesite development, the main limitations <br />are shrink-swell potential, very slow permeability and slope. If buildings <br />are constructed on this soil, properly designing foundations and footings and <br />diverting runoff away from buildings help to prevent structural damage <br />because of shrinking and swelling. The effects of shrinking and swelling can <br />be minimized by using proper engineering designs and by backfilling with <br />material that has low shrink-swell potential. Cuts needed to provide essen- <br />tially level building sites can expose bedrock. Septic tank absorption fields <br />do not function properly because of the very slow permeability. Use of sandy <br />backfill for the trench and long absorption lines helps to compensate for the <br />• very slow permeability. Effluent from septic tank absorption fields can <br />surface in downslope areas and thus create a hazard to health. Slope is a <br />Ex. 16-23 <br />