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4 <br />These treatment •terials would have a moderatel•igh water storage <br />capacit}'• Permeability should be moderate. <br />. These soils have moderately high natural fertility, but mixing would tend <br />to locaer fertility slightly. Supplemental fertilization to insure vigorous <br />growth is suggested. <br />If top dressing and revegetation is discounted as an economically feasible <br />treatment scheme, some other method of stabilization will have to be <br />employed since these extremely fine textured tailings are very susceptible <br />to both wind and water erosion. Chemical stabilizers or gravel surfacing <br />are viable alternatives. <br />Area E contains shallow to moderately deep soils derived from volcanic <br />bedrock, specifically the Windy Gulch formation. This poorly welded ashflow <br />tuff has eaeathered largely by mechanical action to produce caell-drained, <br />coarse textured soils. <br />The major land disruption in Area E will be an access road to ventilation <br />portals. Actual production acres lost is minimal. [.There the road travels <br />through wooded portions, soils seldom exceed a depth of 2 feet. Large <br />slabs of bedrock can occur as shallow as 4" covered by only a thin veneer <br />of organic material anchored by trees. The only evidence of development <br />is a small accumulation of organic matter in the surface layer with an <br />occasional slight concentration of clay in the subsoils. Naturally, the <br />ability of these materials to supply nutrients is limited largely by depth. <br />Soil depth and consequently site productivity increases in the small <br />• adjacent meadoca. The stable soils in the park are well developed and <br />exhibit an A-B-C profile sequence (Cryoborolls). Organic ^;atter and clay <br />accumulations increase with depth and therefore nitrogen and phosphorus <br />are more readily available for plant growth. <br />Area F consists of cold, thin, well-drained soils on steep sideslopes. <br />Rock outcrops and rock slides occupy a large percentage of the area where <br />soil occurs only in patches 2-4" thick. These slopes have high runoff <br />hazard and poor storage of water for vegetation due to lack of soil. <br />Revegetation efforts will be slow and costly on sideslopes due to lack <br />of topsoil, but essential to help control runoff and erosion. <br />The severe slopes will limit the use of equipment and confine most disturbance <br />activity to the more gradual locaer slopes. Soils in these more stable <br />slope positions are well drained, moderately deep Cryoboralfs. The <br />soils have been stable long enough to exhibit a significant accumulation of <br />clay in the B horizon, yet young enough to retain notable supplies of <br />primary minerals and available plant nutrients. Fertility is moderate to <br />high. <br />-39- ~ <br />