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s2 =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, s <br />Jn <br />Performance Standards <br />COVER and HERBACEOUS PRODUCTION: For purposes of comparison only, cover and <br />herbaceous production performance standards were calculated in accordance with procedures <br />contained in the Yoast permit. Aline that indicates 90 percent of this standard has been placed <br />on Figures 1 a and 2 for informational purposes. At such time as bond release is formally sought, <br />revegetation will be considered successful for cover when mean cover for a bond release block is <br />• at least 90 percent of the calculated success standard or approved technical standard. <br />WOODY PLANT DENSITY: For purposes of comparisons in this document, general (background) <br />woody plant density at the Yoast Mine is evaluated using a technical standard of 200 shrubs per <br />acre. Shrub concentration areas such as may be included in eventual bond release blocks are <br />judged by a standard of 2000 stems per acre. <br />Climatic Data <br />Precipitation data were collected at the nearby Seneca IIW Mine during the period 1990 through <br />2007. Since the data record for Seneca IIW exists for only a relatively short period, the long term. <br />average monthly precipitation data from the Western Regional Climate Center (WRCC, WRCC <br />2007) for the nearby town of Hayden (56 years) was used as an appropriate base for comparison. <br />Information on degree-days was based on temperature data from met station 2 at the Seneca IIW <br />Mine. <br />RESULTS <br />All numerical data are found in Tables 1-12 of Appendix 1. Data are summarized in Tables 13-16. <br />Sample data for cover, herbaceous production,. and woody plant density are summarized in Table <br />5 <br />