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Ouary Department — Portland Plant Holcim (US) Inc. Phone 719-784-6325 <br />3500 State Hwy 120 Fax- 719-784-3470 <br />tHolcim Florence, CO 81226 www.lafargeholcim.us <br />January 15, 2018 Certified Mail: 7017 0660 0000 7954 6602 <br />Amy Eschberger M4977 -3U TRO8 <br />Environmental Protection Specialist Annual Fee/Report: CW <br />Division of Reclamation, Mining, and Safety ;: Violations <br />1313 Sherman Street, Room 215 MV -1992-060 8/27/1992 <br />Denver, Colorado 80203 AB 10/20/1992 <br />Subject: Technical Revision to Mine Permit # M-1977-348 RECEIVE® <br />Request for US 287 Realignment Geotechnical Investigation JAN 2 3 2018 <br />Dear Ms. Eschberger: DIVISION OF RECLAMATION' <br />MINING AND SAFETY <br />Holcim (US) Inc. is submitting a request for a Technical Revision (TR) to DRMS Permit No. M- <br />1977-348. This TR is being requested to allow Yeh and Associates to conduct geotechnical <br />investigations supporting the realignment of US Highway 287 as part of the Glade Reservoir <br />Project. <br />The details of the geotechnical investigation can be found in the attached TR Request Document. <br />If you have any questions, please feel free to contact me at 719-288-1423 or <br />derrick.dease0lafargeholcim. <br />Sincerely, <br />Derrick Dease <br />Area Environment and Public Affairs Manager <br />Holcim (US) Inc. <br />Enclosure <br />