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Scott Wanstedt <br />Page 2 <br />8/23/2016 <br />Maintenance work conducted during the 2nd quarter included placing and spreading refuse on RP -2/3/4 <br />and 5a; as well as, spreading and compacting the winter stockpile. Twelve compaction tests were <br />performed this quarter, all of the test results produced proctor values above 90 percent. There were no <br />indications of seepage or any indications of slope failure. The slopes of the piles are stable and only some <br />localized erosion has occurred. The surface drainage facilities are properly conveying surface runoff from <br />the refuse bank areas. <br />This concludes the Division's review of the 2nd Quarter 2016 Professional Certification of the Coal <br />Processing Waste Banks for the Deserado Mine. If you have any questions, please contact me at (303)- <br />866-3567 x 8144 or clayton.wein@state.co.us. <br />Sincerely, <br />U <br />Clayton Wein <br />Environmental Protection Specialist <br />'c <br />555 Street Address, Room 555, Denver, CO 55555-5555 P 555.555.5555 <br />ic <br />* 1876 <br />