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<br />Mr. Gary Tuttle <br />December 16, 1997 <br />Page 3 <br />State Engineer. <br />7. Exhibits D and <br />created in the <br />supply for the <br />Please describe <br /> <br />G state that a 4 acre lined pond will be <br />southwestern portion of the permit as a water <br />concrete, asphalt and washing facilities. <br />how this pond will be lined. <br />Pursuant to C.R.S. 34-32-116(7)(g), the Division is concerned <br />that disturbance to the quality of surface and groundwater be <br />minimized during and after the mining operation. Please <br />describe the operation of the concrete, asphalt and wash <br />plants in enough detail to show how process water will be <br />handled. Please explain what measures will be used to <br />protect the groundwater. Your response needs to explain if <br />all process water pits and/or settling ponds will be lined, <br />how blow-down water will be contained, and where and what <br />types of flocculants will be used. In addition, please commit <br />to protecting the ground below the asphalt loadout by lining <br />the area with concrete or gravel which is periodically <br />recycled in the asphalt plant. <br />8. Please describe in more detail, the slurry wall or walls to be <br />placed around phases two and three. Show the location of the <br />slurry wall(s) on map Exhibit C. If two separate walls are to <br />be installed, explain the timing of their installation. The <br />mining plan states that sandstone and siltstone underlies the <br />gravel to be mined. How effective will the slurry wall be if <br />it is keyed into sandstone and siltstone as apposed to clay or <br />shale? Discuss the method of installation, the geology of <br />the underlying bedrock including its permeability, and how the <br />slurry wall will be keyed into the underlying bedrock. State <br />the slurry wall depth, the groundwater gradient, and how that <br />was determined. <br />9. The mining plan states that the process area will be mined <br />last. Will on site processing still take place during that <br />time? If so, please explain where the processing will take <br />place and how that area will be reclaimed. <br />10. Please state what spill prevention measures will be used for <br />fuel tanks. If fuel tanks are to be placed inside an <br />enclosure, the cost for demolition and disposal will need to <br />