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• 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. 1. = t, s <br />[ln <br />Performance Standards for Use in Interim Monitoring Assessment <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. A line 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% 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 />2009. 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) for the <br />nearby town of Hayden (57 years) was used as an appropriate base for comparison. Information <br />on degree-days was based on temperature data from met station 2 at the Seneca IIW Mine. <br />RESULTS <br />All numerical data are found in Tables 1-17 of Appendix 1. Data are summarized in Tables 18-21. <br />Sample data for cover, herbaceous production, and woody plant density are summarized in Table <br />18, and data on species density by lifeform are summarized in Table 19. Data for relative cover <br />. by lifeform are in Table 20. Statistical adequacy of sampling is tabulated in Table 21. A complete <br />5