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the sand /gravel layer. This water level may also not incorporate a seasonally high water level <br />that would be expected during spring conditions, or with adjacent irrigation. Please address the <br />adequacy of the stability analysis to model the seasonally high water level for this site. <br />8) The material properties used during the analysis, shown in Table 3, differ somewhat from the <br />values used during previous stability analyses done in 2009 and with those used by DRMS. <br />Please provide the basis for why these values were modified for this analysis. <br />9) The analysis focuses on conditions during active mining, while the pits are dry. Please provide <br />analysis regarding the post- mining scenario where the pits are flooded, particularly on the area <br />between the two pits. <br />10) Will there be any monitoring of slope stability during operations? What will that entail? <br />The current decision deadline for this technical revision is August 26, 2013. Please provide responses to <br />the above comments soon enough for the Division to review the responses and complete a follow -up <br />exchange of comments and responses prior to the decision deadline. If you are unable to provide <br />satisfactory responses to any inadequacies prior to the decision deadline, it will be your responsibility <br />to request an extension of time to allow for continued review of this application. If there are still <br />unresolved issues when the decision date arrives and no extension has been requested, the application <br />will be denied. <br />If you need additional information please contact me at the Division of Reclamation, Mining and Safety, <br />1313 Sherman St., Room 215 Denver, CO 80203, by telephone at 303 - 866 -3567 extension 8131, or by <br />email at tyler.odonnell@state.co.us. <br />Sincerely, <br />Tyler O'Donnell <br />Environmental Protection Specialist <br />Cc: Tom Kaldenbach, DRMS <br />Mr. Karl Nyquist <br />GP Aggregates, LLC <br />7991 Shaffer Parkway, Suite 200 <br />Littleton, CO 80127 <br />