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<br /> <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />John W. Hickenlooper, Governor | Mike King, Executive Director | Virginia Brannon, Director <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br /> <br /> November 19, 2015 <br /> <br />Alex Schatz <br />Brannan Sand & Gravel Company <br />2500 East Brannan way <br />Denver, CO 80229 <br /> <br />Re: Pit 29, DRMS File No. M-1980-183 <br />Technical Revision No. 5 (TR-05) <br />Preliminary Adequacy Review <br /> <br />Dear Mr. Schatz: <br /> <br />The Division of Reclamation, Mining and Safety (Division) received Technical Revision No. 5 (TR-05) for the above <br />referenced site on November 13, 2015. The decision date for TR-05 is December 14, 2015. The Division has reviewed <br />TR-05 and has the following comments and questions: <br /> <br />1) Please specify the diameter of the perforations in the 12 inch HDPE pipe. <br /> <br />2) The original design for the filter material inside of the geotextile, surrounding the pipe was specified as a 2 inch <br />washed rock. The new design proposed in TR-05 calls for the use of clean granular material. The Division is <br />concerned that the clean granular material may contain particles smaller than the perforations of the pipe, thus <br />creating the potential to clog or silt in the pipe. Please specify the size of the material to be placed inside of the <br />geotextile. <br />This concludes the Division’s preliminary adequacy review of TR-05. This letter shall not be construed to mean that there are <br />no other technical deficiencies in your submittal. Please remember that the decision date for TR-05 is December 14, 2015. <br />At this time, if you are unable to provide satisfactory responses to any inadequacies prior to this date, it will be your <br />responsibility to request an extension of time to allow for continued review of this Technical Revision. If there are <br />still unresolved issues when the decision date arrives and no extension has been requested, TR-05 will be denied. <br /> <br />If you need additional information please contact me at the Division of Reclamation, Mining and Safety, 1313 Sherman St., <br />Room 215, Denver, CO 80203, by telephone at 303-866-3567, extension 8131, or by email at Tyler.ODonnell@state.co.us. <br /> <br />Sincerely, <br /> <br /> <br />Tyler O’Donnell <br />Environmental Protection Specialist <br /> <br />ec: Wally Erickson, DRMS