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Reveaetation ear Standar tabular tvalue t* statistic <br />Riparian 2006 90% of 1,000 1.3277 571.1975 <br />Comparison of the calculated t-statistic (t") for the standard with the respective tabular tvalue <br />indicates that 1"` is equal to or greater than t. This results in the conclusion that the cerformance <br />standard was met at the required significance level of a = 0.1 for the riparian revegetation unit in 2006. <br />Therefore, the woody Dlant densiri standards have been met with absolute confidence in both <br />reveaetation units in 2006. <br />3.6 Utility <br />Although a determination of utility is not mandated by permitting requirements, little argument can <br />be generated regarding the revegetated area's utility for the primary intended post-mining land use <br />(livestock grazing) as well as incidental use by wildlife. The increased utility of these revegetated areas is <br />evident from an analysis of the various data collected for cover, production, and diversity and from <br />observation of wildlife sign left routinely around the reclaimed area. <br />With regard to the measured variables, the increase in utility of the reclaimed area is self-evident. <br />The average total herbaceous cover of the grassland and riparian revegetation exhibited 244% and <br />129% of that found on the analogous reference areas in 2006, respectively. Average total herbaceous <br />production of the grassland and riparian revegetation exhibited 209% and 115% of that found on the <br />analogous reference area in 2006, respectively. Therefore, measured ground cover in the grassland unit <br />has been increased by nearly two and a half times that of the reference area while measured production <br />has been increased over two times. As one would expect, cover and production increases in the riparian <br />unit are more modest. <br />CEDAR CREEK ASSOCIATES, INC. Page 17 Blue Ribbon Mine - 2006 <br />Phase III Bond Release Evaluation <br />