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<br />where all variables are the same as previously described; <br />the value of 0.1 in the denominator represents the <br />detectable change in the sample mean, which in this case is <br />still ten percent. <br />The vegetation cover data for this study: <br /><t.20)2C2s2) <br />number of samples <br />C1.73)2 C2)2 <br />6 <br />[(.10) (69.6)]2 <br />10 samples <br />• <br />• <br />As shown, sampling was adequate even to meet this more <br />stringent requirement. <br />Monthly precipitation data from the Rifle Weather Station is <br />submitted with the baseline data. The precipitation data <br />documents that the sampling year was not a below average <br />precipitation year (see Table 16t Precipitation Records). <br />When reclamation is nearing completion, the same sampling <br />methods will be used. Th• same methods will develop <br />consistent values with the vegetation baseline study. If <br />the area exhibits an unusually high percentage of cover due <br />to the sagebrush cover, an alternate method of determining <br />revegetation success may be determined. An alternative <br />method would b• one based on standards set by the Soil <br />Conservation Service and Colorado State University Range <br />Management to prevent erosion of reclaimed areas. <br />Vegetation - Environmental Factors. The environmental <br />factors that control or limit species distribution include <br />physiographic features, climate features, soils, and usage <br />stability. The physiograpic features of the site include <br />moderately steep to very steep hillsides. Slopes range from <br />IS% to 70%. Those slopes in the affected area usually face <br />south or west. The elevation ranges from 5,000 feet to <br />7,000 feet. <br />The limiting climate features include an annual <br />precipitation of approximately 11 inches to 14 inches. The <br />average annual air temperature is 4B degrees farenheit, and <br />the average frost-free period is about 125 days. <br />83 <br />Revised 5/87 <br />