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1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br />1 <br /> <br /> <br /> <br />1 <br /> <br /> <br />AOpendu A -Vegetarian Sampling (or 1993 <br />absolute cover on the reclaimed area is 96.1 percent of that sampled on the reference area (22.80 <br />vs. 23.73 percent). <br />PRODUCTION - 1998 <br />The sample mean for production values on the reclaimed area is more than double the sample <br />mean for production values on the reference area (Tables A-8 and A-9). Determination of sample <br />adequacy was based upon the "wet weights" of clipped vegetation in the field (Table A-2). <br />Adequacy was reached on the reference area with fifteen samples. Production values on the <br />reclaimed area were highly variable, and sample adequacy was not achieved after clipping fifty <br />plots. <br />Table A-2 <br />Colorado Coal Mine No. 1 <br />0.5 square-meter Production Plots <br />Summary of Sample Adequacy Calculations <br /> Mean Computed <br /> Field "Wet" Weight Standard Actual Adequate <br />Area (grams) Deviation Sample Size Sample Size <br />Reclaimed Area 57.12 47.42 50 116.30 <br />Reference Area 24.14 6.91 15 14.80 <br />Density calculations were based upon the resulting total "dry" weights. The mean density on the <br />reclaimed area is 542.52 lbs./acre, more than double the estimated production density of 238.13 <br />lbs./acre sampled on the reference area. Since sample adequacy on the reclaimed area was not <br />achieved, Equation 4 was used to prove that the lower confidence limit of [he reclaimed area <br />production data is greater than the success standard (the reference area sample mean) at the 90% <br />confidence level. The results of this analysis, shown on Table A-10, prove that the production <br />values on the reclaimed area exceed the 90%o standard required in relation to the reference area <br />data. <br />SPECIES DIVERSITY - 7998 <br />Analysis of species present on the two areas indicates each is dominated by perennial grasses; <br />80.32 percent relative cover on the reference area, 87.28 (June) and 80.43 (Sep[.) percent on the <br />reclaimed area. Relative cover of perennial forbs is 6.38 percent on the reference area. Perennial <br />forb relative cover on the reclaimed area for June and September are 5.24 and 5.29 percent, <br />respectively. Shrubs comprise 7.97 percent of the relative cover on the reference area with the <br />reclaimed area having a relative shrub cover of 3.74 and 4.76 percent for June and September, <br />respectively. Annual forbs and grasses comprised 5.32 percent of the relative cover in the <br />Bond053 1999-OSJ.wpd\Fcbruary 26. 1999 A-8 <br />1 <br />