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<br />Response: WMI will excavate all recoverable gravel above the bedrock. <br />;-~ 10. Comment: Please specify the dimensions of any existing or proposed road(s) that <br />will be used during the mining operation. Describe any improvements <br />necessary on existing roads and the specifications to be used in <br />construction of new roads. New or improved roads must be included as <br />part of the permitted acreage. In addition, please describe any associated <br />drainage and runoff conveyance structures to include sufficient <br />information to evaluate structure sizing. <br />Response: WMI will not construct any permanent roads as part of the amended <br />mine azea. Existing roads used in association with the Lyons operation <br />aze part of the currently approved DMG permit for the Rockin' WP site <br />(Permit No. M-74015). <br />X11. Comment: The applicant states that a dewatering trench will be constructed to <br />facilitate mining. Please indicate the dimensions of the trench in the <br />application, and provide a typical cross section of the dewatering trench. <br />In addition, please indicate where the water will be pumped and <br />discharged and/or if any diversion or impoundments will be created. <br />Response: The evacuation of the dewatering trench is part of the mining process. <br />Typically, the dewatering trench is excavated azound the perimeter of <br />the stage to be mined in order to facilitate dewatering prior to <br />1 excavation and reclamation. Attachment #4, "Mining and Reclamation <br />Sequence," depicts the excavated dewatering trench in the context of <br />the mining and reclamation process. Water is discharged per an NPDES <br />permit. <br />12. Comment: On Page E-3. the applicant states that two reservoirs aze proposed for <br />the West Plant site. Will the reservoirs be sealed and capture surface <br />water, or will they be rechazged by groundwater? Please indicate <br />appropriate water right and provide designs of how the reservoirs will <br />be constructed (i.e. pond slopes, material to be used, compaction, inlets, <br />spillways...) and provide an appropriate cross section. <br />Response: The proposed water storage reservoirs will not be hydrologically <br />connected to the St. Vrain Creek alluvium. The right to store water in <br />the "Rockin' WP Ranch" Lake No. 5 is described in Case No. <br />' DMG Adequacy Review Response Page 4 <br />