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WOUNK] <br />State.co.us Executive Branch Mail -Re: Colowyo TR -100 Geotech Review <br />Zuber - DNR, Rob <rob.zuber @state.co.us> Tue, Oct 1, 2013 at 1:06 PM <br />To: "Trujillo - DNR, Zach" <zach.trujillo @state.co.us >, Mary Rodriguez - DNR <mary.rodriguez @state.co.us >, <br />Alysha Hernandez - DNR <alysha.hernandez @ state.co.us> <br />Thank you, Zach. <br />Mary\ Alysha - please scan and file this e-mail and attachment as one document as follows. <br />Name: Trujillo email and MSHA assessment of independent pillars <br />Type & Sequence: TR -100 <br />Thanks, <br />Rob <br />On Tue, Oct 1, 2013 at 12:51 PM, Trujillo - DNR, Zach <zach.trujillo @state.co.us> wrote: <br />Rob, <br />After reviewing Agapito Associates, INC's (AA) Geotechnical Design and Operation Considerations for Highall <br />Mining for Colowyo Mine's TR -100 as well as the MSHA approval of past multi -seam highwall mining design <br />consideration from Colowyo, I concur with AA's design assessment for independent columniation of pillars for <br />the multi -seam highwall mining panels related to TR -100. In AA's report, they sufficiently have shown that no <br />subsidence would occur with independent multi -seam columns and long term global stability would be <br />maintained. <br />If you have any questions, feel free to contact me. <br />Sincerely, <br />https: / /mai l.g oog le.conVmai 1 /u /0 / ?ui =2 &i Ire29129fcb5 &view= pt &search =i nbox&th= 141756al ec239a7c 1/2 <br />