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• rill be represented by a reference area. Sampling of the area to be mined <br />l <br />x111, therefore, be stratified according to the soil survey. <br />B,4, Density of SandsaRe <br />B,4,1. Purpose of sampllnK <br />Because the density of sandsage is a relatively stable attribute, the mean <br />density by subsite on the area to be mined provides the most appropriate <br />base for success standard, This corresponds to the regulations at 4,15.7 <br />(2)(d)(iii), <br />B,4.2. General sampling procedure <br />We prepared a grid 600 by 600 feet beginning at the SW corner of Section 25, <br />which lies xithin the area to be mined. This grid extended therefrom into <br />Sections 25, 26, 35 and 36 to cover the area to be mined. A total of 120 <br />• points were obtained xith 28 points on Osgood Sand and 92 points on Valent <br />Sand. Of the 28 points on Osgood Sand, xe chose at random 15 points to be <br />sampled. Of the 92 points on Valent Sand, xe chose ZO points at random <br />to be sampled. All sampling points rill be located by pacing along compass <br />lines, Densities rill be reported in number per acre. <br />B,4,3, Plot size <br />Preliminary sampling indicates sandsage density in the general range of <br />1,000 to 3,000 per acre. To obtain counts large enough to pexait the uae <br />of normal-theory statistics on uncoded date, we propose a plot size of <br />1100 th acre (5 by 87 feet). <br />B.4,4. Sample size <br />Fifteen to 20 plots on each subsite should be sufficient. If additional <br />plots are needed, the random selection of grid points rill be expanded. <br />• <br />C <br />3 <br />