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4/16/2014 State.co.us Executive Branch Mail - Fwd: FW: Wolf Creek Reserve -Response to CDRMS Preli mi nary Comments and Modification of Groundwater Invest... <br />Jason Musick and myself have reviewed the information contained in your e -mail above including the Wadge Coal <br />Structural Contour Map and corresponding discussion. I think your presentation was well thought out and <br />accurate regarding the hydrogeologic conditions that likely exist within and above the Wolf Creek Reserve at this <br />locale. I agree that there is just not a viable location for a down gradient monitoring point given the geologic <br />structure. Your planned approach seems reasonable. With this plan we will at least satisfy the requirements of <br />2.04.7 in obtaining the baseline groundwater information for the Wadge /Wolf Creek Interburden and the Wolf <br />Creek Coal with wells located on both sides of the structural axis of the synclinal basin. This plan; however, <br />does not provide a means for determining future impacts or degradation of groundwater. Given these constraints <br />think the plan may be doable if it is combined with mine inflow monitoring and reporting throughout the life of mine <br />to obtain groundwater quantity and quality data. Or confirm the lack of groundwater. Some more work would be <br />needed to verify with SEO database wells within and adjacent to the permit area to verify non use of the water. <br />The WCR PHC discussion in the permit document would need to be revised and updated accordingly to reflect <br />the closed basin conditions and non use. One remaining question that the Division has is the use of exploration <br />drill holes modified and retrofitted to be utilized as water quality monitoring wells. There are some inherent <br />problems with this approach including proper well development and the ability to obtain good quality samples. <br />You state that TC has several similar 2 -inch wells in place at similar depths, which are successfully monitored <br />on a regular basis. We would like to explore this before we approve the smaller diameter exploration drill holes <br />with a modified well construction design. We would need to know which wells these are and how they are <br />completed;how are these wells purged and sampled; and are they permitted with the DWR. We appreciate your <br />cooperation in this review. Please let me or Jason know if you have questions. Thanks. <br />Mike <br />On Tue, Mar 18, 2014 at 3:11 PM, Nettleton, Jerry <JNettleton peabodyenergy.com> wrote: <br />appreciate We <br />on • Engineers, r research, we are <br />proposing • <br />designations on the attached figure have been changed from the figures originally pro\Aded in the Work Plan. If <br />our proposal is acceptable, we will modify the Work Plan and update the corresponding figures for consistency. <br />g <br />https: / /mail.g oog le.conVmai I /u /0 / ?ui =2 &i k= e29129fcb5 &viev�-- pt &search =i nbox&th= 1456bl4cO8d4b9ff &si ml= 1456bl4cO8d4b9ff 5/9 <br />