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Peabod <br />was not conducted for production in 2009 and 2011). These data are contained in annual <br />monitoring reports submitted to CDRMS for the above years. The tests were two - sample t -tests <br />assuming equal variance. The results of these analyses are shown in Figures 1 and 2 enclosed <br />with this submittal letter. As shown in the Figures, no statistically significant difference between <br />the eastern half of the reference area and the whole reference area is indicated for cover or <br />production in any of the fifteen years evaluated. <br />Included with this submittal are: <br />• Figures with Test Results <br />• Insertion Instructions <br />• Application for Revision <br />• Public Notice <br />• Text Revision <br />We would appreciate your consideration and cooperation in facilitating timely review and <br />approval of this submittal. Once you have had opportunity to review this submittal package, <br />please feel free to contact me at 970 - 276 -7003 with any questions or comments. <br />Best regards, <br />III ENERGY <br />Peabody Sage Creek Mining, LLC <br />B. Scott Cowman <br />Senior Environmental Specialist <br />Peabody Sage Creek Mining LLC <br />Peabody Sage Creek Mine <br />attachment(s) <br />cc: Foster Kirby (OSMRE) <br />Jennifer Maiolo (BLM) <br />Peabody Sage Creek Mine <br />PO Box 250 <br />36600 Routt County Road 27 <br />Hayden, CO. 81639 <br />