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S = sample variance <br />d = 0.1 (0.15 for woody plant) (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 by <br />the standard error of the mean of the sampled area. <br />C.I. = t <br />"In <br />Performance Standards for Use in Interim Monitoring Assessment <br />COVER AND PRODUCTION: <br />For purposes of comparison only, cover and herbaceous production performance standards were <br />calculated in accordance with procedures contained in the Yoast permit. A line that indicates 90 <br />percent of this standard has been placed on Figures 1 and 2 for informational purposes. At such <br />time as bond release is formally sought, revegetation will be considered successful for cover <br />when mean cover for a bond release block is at least 90% of the calculated success standard or <br />approved technical standard. <br />WOODY PLANT DENSITY: <br />For purposes of comparisons in this document, general (background) woody plant density at the <br />Yoast Mine is evaluated using a technical standard of 200 shrubs per acre. Woody plant <br />concentration areas that are included in eventual bond release blocks are judged by a standard of <br />2000 stems per acre. <br />Climatic Data <br />Seneca Coal Company (SCC) has historically provided precipitation data for the nearby Seneca II <br />and IIW Mines, however 2011 data was not available as of March 2012, and therefore 2011 <br />precipitation data was obtained from the NOAA administered Western Regional Climate Center <br />5 <br />