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vegetation variability in the MBRA is very high making sample adequacy difficult to achieve <br />during sampling. SCC proposes that the mean cover value will be the upper limit of the <br />90% confidence interval of the mean calculated after 15 samples. The mean cover value of <br />the MBRA will then be multiplied by two and used in determining the weighted average for <br />the success standard as outlined in the permits. <br />I feel that this method meets or exceeds the standard set by the previous method used to <br />determine sample adequacy for the reference area. Also, a technical revision for this <br />change is not necessary because sample adequacy calculations/ requirements were not <br />specified in the permits for the reference areas, only the bond release areas. <br />I do not have any further questions or comments regarding these bond release applications. <br />If you have any comments or questions, please do not hesitate to ask. <br />Brock Bowles <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />303 - 866 -3567 ext. 8142 <br />2 <br />