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Peabody Sage Creek Mine July 2014 <br />SL -3 Phase III Bond Release Request <br />Sample adequacy for total vegetation cover was achieved for the BRB PSCM -1 Phase III bond <br />release area and the sagebrush and mountain brush reference areas in 2010 and 2011. For total <br />allowable first hit herbaceous cover, adequacy based on first hit cover and was achieved for BRB <br />PSCM -1 and the sagebrush reference area but not for the mountain brush reference area. <br />Considering this, calculation of sample adequacy in the mountain brush reference area using all <br />hit herbaceous cover was proposed to CDRMS. Once sample adequacy was achieved based on <br />all hit herbaceous cover, the ratio of first hit to all hit herbaceous cover is then assessed for <br />sample adequacy. The all hit mean herbaceous cover would then be converted to a first hit basis <br />using this ratio and that converted value is then used in the calculation of the performance <br />standard. This approach was reviewed and approved by Dan Matthews of CDRMS on August <br />11, 2009. Please refer to page 6, Attachment I ( CDRMS approval) and Tables C4 and G2 in the <br />vegetation report contained in Attachment D for more detail. <br />Sampling results and statistics for total first hit cover and allowable first hit herbaceous cover are <br />summarized below in Tables 2 and 3. See pages 19 and 23 and Table C -4 in the vegetation report <br />contained in Attachment D. <br />Table 2. 2010 and 2011 Data and Sample Adequacy Summary for Total First Hit Cover, <br />Phase III BRB PSCM -1 and Sagebrush and Mountain Brush Reference Areas. <br />Area <br />Total First Hit Cover (x) <br />s <br />N <br />N.j. <br />t <br />Phase III Bond Release <br />BRB PSCM -1 2010 <br />58.8 <br />9.7 <br />30 <br />5 <br />1.311 <br />Mountain Brush RA 2010 <br />71.5 <br />7.4 <br />15 <br />2 <br />1.345 <br />Sagebrush RA 2010 <br />71.1 <br />5.9 <br />15 <br />2 <br />1.345 <br />Phase III Bond Release <br />BRB PSCM -1 2011 <br />60.1 <br />7.7 <br />30 <br />3 <br />1.311 <br />Mountain Brush RA 2011 <br />85.3 <br />5.9 <br />21 <br />1 <br />1.325 <br />Sagebrush RA 2011 <br />74.3 <br />5.9 <br />15 <br />2 <br />1.345 <br />Ell <br />