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especially important the stability of Sunshine Canyon Drive be addressed in this amendment <br /> application. Please provide a notarized structure agreement with the owner of Sunshine Canyon <br /> Drive. If such an agreement cannot be reached, please provide an appropriate engineering <br /> evaluation that demonstrates this road will not be damaged by activities occurring at the mining <br /> operation in accordance with Rule 6.3.12(b). <br /> CMC Response: CMC and the Boulder County Transportation Department entered into an <br /> Agreement to address the stability and safety of that portion of Sunshine Canyon that was <br /> damaged when the Times Mine adit's old timbers collapsed. For the last two years, the slope <br /> above the Times Mine adit portal has been observed and monitored for any signs of weakness or <br /> slope failure. Because the galvanized culvert was extended much further out from the hard rock <br /> entrance to the Times Mine Cross-cut, the angle of repose of the material built up over the years <br /> is now much less steep than before. Additional material composed of decomposed granite was <br /> used to lessen the angle of repose above the Times Mine adit, and the slope above the entrance to <br /> the mine appears to have stabilized. The Boulder County Transportation Department was given a <br /> notarized Structure Agreement, and it is under consideration and will be forwarded to the DRMS <br /> as soon as possible. <br /> Additional Item(s): <br /> 32) The Division previously forwarded all comment letters received for the amendment <br /> application during the public comment period that closed on January 24, 2018. Please respond to <br /> any jurisdictional concerns expressed by objectors, including the Pine Brook Water District <br /> (objection letter enclosed). <br /> CMC Response: CMC responded to everyone who sent the DRMS negative comments about <br /> the Amendment Application. Copies of all of the letters that CMC sent to the objectors, <br /> including the Pine Brook Water District are attached to this Response Letter. <br /> 33) The Division accepts the operator's response to comments received from Boulder County <br /> Parks and Open Space, Boulder County Land Use Department, Colorado Historical Society, and <br /> Division of Water Resources. Please address any concerns or recommendations in agency <br /> comment letters received from the U.S. Army Corps of Engineers (February 6, 2018; comment <br /> letter enclosed) and the City of Boulder Public Works (March 5, 2018; comment letter enclosed). <br /> CMC Response: CMC addressed any concerns and accepted the recommendations of the U.S. <br /> Army Corps of Engineers by contacting the Boulder County Engineer's Office about obtaining a <br /> Floodplain Development Permit for the installation of the lowermost portion of the Gold Hill <br /> Mill Waterline. This will now be limited to the flexible hose and the metal screened box that the <br /> intake pipe will be inserted into to pump water from Left Hand Creek under the terms of the <br /> Water Court Decree obtained on October 2, 1985. <br /> 16 <br />