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Ms. Dennis <br />Page 12 <br />April 14, 2014 <br />height of the CKD stockpile may affect groundwater and surface water. Please provide a <br />discussion of the possible impacts to the hydrologic balance and describe how the Operator <br />intends to mitigate against any possible impacts. <br />7. The Operator has proposed using the truck wash water for dust control around C -Pit. Please <br />specify the average volume of water that is used for dust control around C -Pit on a monthly <br />basis. In addition, please specify the estimated amount of water from the truck wash area <br />which would be placed into C -Pit and describe how the water would be transported to C -Pit. <br />8. Both the Division and the Operator have spent an extensive amount of time investigating <br />sources of groundwater inflow into C -Pit, in an effort to minimize or eliminate ponding in the <br />CKD disposal area. The Operator has undertaken efforts such as placing shale along the <br />southwestern highwall to prevent inflow. In addition, a pump was installed to draw down the <br />water level in C -Pit. The Division approved of this consumptive use of the water in C -Pit <br />since the efforts to eliminate inflow have not been successful. The proposal to place excess <br />truck wash water into C -Pit seems to be counter to all previous efforts to eliminate water <br />within the pit. Please explain how placing excess truck wash water into C -Pit aids in the <br />reclamation of the CKD disposal area. <br />9. Currently truck wash water is discharged into the Ortho Ponds. Please describe what will <br />happen to the Ortho Ponds if they are no longer used as the discharge point. How will be they <br />be reclaimed and when would reclamation occur? <br />This concludes the Division's preliminary adequacy review of this Technical Revision. Please <br />remember that the decision date for this Technical Revision is April 23, 2014. As previously <br />mentioned, if you are unable to provide satisfactory responses to any inadequacies prior to this <br />date, it will be your responsibility to request an extension of time to allow for continued review <br />of this Technical Revision. If there are still unresolved issues when the decision date arrives and <br />no extension has been requested, the Technical Revision will be denied. <br />If you have any questions, please contact me at (303)866 -3567 x8116. <br />Sincerely, <br />d- - <br />Michael A. Cu Ingham <br />Environmental Protection Specialist <br />CC: Tom Kaldenbach, DRMS <br />ti OF COLO�F <br />1313 Sherman St., Room 215, Denver, CO 80203 P 303 - 866 -3567 <br />1876 <br />