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• contiguously by hand on maps of 1:4,800 scale. Sample locations were selected from the <br />numbered grid cells. The SCC-assigned numbers of samples for a given parameter in a given <br />area reflected previously experienced sample variability or the level of precision required in a <br />given area. Random numbers generated by computer were used to select grid cells, in the <br />middle of which a sample point was placed. These sample points were located as accurately as <br />possible in the field using aerial and topographic maps and pacing from known locations. Cover <br />and woody density transects were located and oriented using a blind throw of a meter stick. Final <br />location of each herbaceous production quadrat was accomplished with a blind throw of the <br />sampling hoop made from the origin of the associated cover/woody plant density transect. At <br />each cover/woody plant density sampling location, the slope (percent) and aspect of the site (in <br />degrees not corrected for magnetic declination) were determined and recorded, as was the <br />orientation of the transect (in degrees not corrected for magnetic declination). <br />Sample Adequacy Calculations <br />Sample adequacy calculations parameter estimation without hypothesis testing were carried out <br />using the formula as prescribed by the Colorado Mined Land Reclamation Board for parameter <br />estimation without hypothesis testing (CMLRB) (1995): <br />t2 92 <br />Nmin= ----------- <br />(d x )z <br />where: <br />• to =one-tailed t-value with (n-1) degrees of freedom, a=0.10 <br />sz =sample variance <br />d = 0.1 (level of precision or desired detectable reduction) <br />x =sample mean <br />Confidence Limits <br />Confidence limits for comparisons to reference areas and technical standards were calculated <br />using a 1-tailed t-value for alpha error probability of 0.10 at (n-1) degrees of freedom multiplied <br />by the standard error of the mean of the sampled area. <br />C.l.=~ ~S 1 <br />Jn <br />Performance Standards <br />COVER: For purposes of comparison only, a cover performance standard was calculated in <br />accordance with procedures contained in the Seneca II-W. Aline that indicates 90 percent of <br />this standard has been placed on Figure 1 for informational purposes. At such time as bond <br />release is formally sought, revegetation will be considered successful for cover when mean cover <br />for a bond release block is at least 90% of the calculated success standard or approved technical <br />• standard. <br />