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COLORADO <br />® �/ Division of Reclamation, <br />�il0- Mining and Safety <br />Department of Natural Resources <br />Date: November 6, 2020 <br />To: Tabetha Lynch <br />CC: Jason Musick <br />From: Zach Trujillo <br />RE: Foidel Creek Mine, DRMS File No. C-1982-056 <br />Foidel Creek Mine TR-94 Adequacy Review Memo <br />Tabetha, <br />As requested I have reviewed Foidel Creek Mine's (Foidel) adequacy responses for TR-94. TR-94 <br />proposes to update the Foidel PAP to include modifications to the Coal Refuse Disposal Area (CRDA) <br />due to surveying errors with the construction of the second lift. During my original review, I requested the <br />following information to be provided: <br />• Soil properties used in the geotechnical analysis used for the proposed modified CRDA. <br />• Information that shows where the profiles used in NWCC's geotechnical analysis are located for <br />the proposed modified CRDA. <br />In Foidel's response, they included the report "Geotechnical and Hydrologic Investigation Coal Refuse <br />Disposal Area Expansion" dated June 16, 2009 (the Report). The Report is the geotechnical investigation <br />with the currently approved configuration of the CRDA. In the Report, soil properties were provided <br />along with the location of the profile used in the slope stability analysis. The soil properties have been <br />reviewed and are within reasonable ranges and acceptable values. The profile used in the slope stability <br />analysis is considered to be at the critical area for the previously approved configuration of the CRDA <br />and is still applicable for the currently proposed CRDA configuration. With the Report, Foidel has <br />provided all the above mentioned information requested. At this time, I have no further concerns or <br />comments for the proposed TR-94. This concludes my review of Foidel's TR-94 and if you have any <br />questions, feel free to contact me. <br />Sincerely, <br />� ��-ffla � <br />Zach Trujillo <br />Environmental Protection Specialist <br />(303) 866-3567 ext. 8164 <br />Foidel Creek Mine TR-94 Memo <br />November 6, 2020 <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director <br />