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Seneca 11 Mine <br />SL -6 Phase ❑I Bond Release Request <br />June 2014 <br />Since critical t,, = 0.852 (one - tailed, alpha = 0.2, 36 df,,) and t,: (16.41) is greater than this critical <br />value, the hypothesis of less than or equal to 90% of the standard is rejected. Consequently <br />revegetation success for Phase III in BRB -5 relative to the Sagebrush Reference Area is <br />demonstrated. <br />Since the herbaceous production of BRB -5 has been shown to exceed both reference areas via <br />the above hypothesis tests, revegetation success is indicated for Phase III BRB -5 herbaceous <br />production in 2011. <br />2012 Herbaceous Production Success Evaluation <br />The 2012 herbaceous production values for the mountain brush and sagebrush reference areas <br />are summarized in Table 6 above. Calculation of 90 percent of the cover performance standard <br />appropriate for 2012 sampling is demonstrated below. <br />Mountain Brush Reference Area Allowable herbaceous production* = 214.5 lbs /acre <br />Sagebrush Reference Area Allowable herbaceous production * = 456.8 lbs /acre <br />90 percent of the Production Standard = 0.90 [0.83(214.5) + 0.17(456.8)] = 230.1 lbs /acre <br />The 2012 Phase III BRB -5 mean allowable herbaceous production of 976.1 pounds per acre <br />(Table 5) exceeds 230.1 pounds per acre, which is 90 percent of the production performance <br />standard. The average annual and biennial sampled 2012 BRB -5 production was not greater than <br />10 percent of total herbaceous production and therefore no "excess" annual /biennial production <br />deduction was required in 2012. Noxious weed production was not collected. <br />The 2012 BRB -5 allowable herbaceous production exceeds 90 percent of the production <br />performance standard but sample adequacy was not demonstrated with a minimum of 30 <br />samples taken in either the reclaimed or the reference areas. Therefore reclamation success for <br />Phase 111 2012 herbaceous production is demonstrated by passing a two- sample t -test of Reverse <br />Null Hypothesis with Satterthwaite's Adjustment (CDMG 2010 proposed rules revisions 4.15.1 <br />(2)(c)). Refer to the text and Appendix C in the Report contained in Attachment D to this <br />document for additional information. <br />13 <br />