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C- 1981 -008 - SL -12 <br />Preliminary Adequacy Review <br />26 May 2010 <br />Page 7 of 7 <br />value as the consultant, and this value (3705.3) is also listed on the Attachment 2 <br />spreadsheet. <br />c) The same minor error (use of alpha error probability value of 0.1 for table t- statistic), <br />and the same more serious error (Excel formula error with resultant extremely high <br />value for the calculated t- statistic) were both incorporated into the success <br />demonstrations for the 2008 IP production data, the 2007 Dryland Pasture production <br />data, and the 2008 Dryland Pasture production data. <br />Please re -run the 2- sample reverse null t -tests for 2007 and 2008 IP and DP production <br />success demonstrations using the appropriate .02 alpha error probability for the table t- <br />statistic, and the corrected Excel formula for the calculated t- statistic, and revise <br />Production Text Tables 2, 4, b, and 8 with the corrected values. If the success results for <br />any particular comparison change or are reversed based on the corrected test results, the <br />corresponding "Comparison to Standard" narrative will need to be revised, along with <br />other narrative sections of the application, as appropriate. <br />This concludes the preliminary adequacy review for the SL -12 Performance Bond Release <br />request for the New Horizon Mine. The bond release inspection, to be conducted in accordance <br />with Section 3.03.2(2), is scheduled to begin at 10:30 a.m. on Wednesday, June 2, 2010. <br />Sediment loss demonstrations will be evaluated subsequent to the bond release inspection. <br />Please contact me with any questions you may have. <br />Sincerely, <br />�� =11 / � <br />Marcia L. Talvitie, P.E. <br />Environmental Protection Specialist <br />cc: Greg Lewicki and Associates <br />Sandy Brown, DRMS <br />