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9/3/2019 State.co.us Executive Branch Mail-Re: Deserado TR-72 <br /> :f ' ►; O STATE F <br /> STATE Do DRMS—CoalAdmin - DNR, DNR<dnr-drms—coal—admin@state.co.us> <br /> COLO <br /> Re: Deserado TR-72 <br /> 1 message <br /> Trujillo - DNR, Zach <zach.trujillo@state.co.us> Fri, Aug 30, 2019 at 10:02 AM <br /> To: "Wein - DNR, Clayton" <clayton.wein@state.co.us> <br /> Cc: Jason Musick- DNR<jason.musick@state.co.us>, DNR DRMS_CoalAdmin - DNR<dnr_drms_coal_admin@state.co.us> <br /> Clayton, <br /> Attached is my review for the Deserado Mine (C-1981-018)TR-72. If you have questions, feel free to contact me. <br /> Sincerely, <br /> On Fri, Aug 30, 2019 at 9:19 AM Wein - DNR, Clayton <clayton.wein@state.co.us>wrote: <br /> Thank you Zach, I appreciate the time you took to take a look at this for me on short notice. I'll buy you a coffee if you <br /> would like? <br /> Clayton Wein <br /> Environmental Protection Specialist <br /> C 0 L 0 R A D 0 <br /> a-..a Division of Reclamation, <br /> C40 <br /> 7ry�i► Mining and Safety <br /> Department of Natural Resources <br /> P 303.866.3567 x 8144 1 F 303.832.8106 <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 <br /> clayton.wein@state.co.us I http://mining@state.co.us <br /> On Fri, Aug 30, 2019 at 8:13 AM Trujillo- DNR, Zach <zach.trujillo@state.co.us>wrote: <br /> Clayton, <br /> In the event my letter doesn't reach you by the time you have to leave, the following summarizes my only comments <br /> to include into your adequacy letter. <br /> • After reviewing Deserado Mine's TR-72 for proposed refuse pile RP-A, there was no provided information in <br /> how the subgrade or foundation of RP-A will be developed prior to the placement of refuse. Please have <br /> Deserado provide additional information regarding the subgrade or foundation development to RP-A prior to <br /> refuse placement. <br /> • In HB Engineering &Testing, LLC's Report, they discuss the potential of increased pore water pressures <br /> within the refuse pile with the burial of saturated refuse. An increase in pore water pressure could impact the <br /> stability of the refuse pile. Given this concern, HB suggested the potential of including wire piezometers in the <br /> refuse pile to monitor pore pressure as an option. However, given the site's environment and characteristics, <br /> the requirement of piezometers doesn't seem necessary under the assumption that refuse is allowed to <br /> properly dry before being spread, compacted and buried. Please have Deserado provide information and <br /> discussion on how they plan to allow refuse to reach an optimal state prior to burial to insure stability of RP-A. <br /> If I have any other last minute comments, I'll try and get them to you before you leave. <br /> C 0 L 0 R A D 0 <br /> C40 <br /> Division of Reclamation, <br /> Mining and Safety <br /> Department of Natural Resources <br /> Zach Trujillo <br /> Environmental Protection Specialist <br /> P 303.866.3567 x 8164 1 F 303.832.8106 C 303.563.9185 <br /> https://mail.google.com/mail/b/AH1 rexQVbELATZzPp-GyUxhZFuDsRthHssyezvldvGhnrw9iHoJf/u/O?ik=deb7fOcd20&view=pt&search=all&permthid=th... 1/2 <br />