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Environmental Protection Facility Certification <br /> Henderson Mine — Permit No. M-1977-342 <br /> Technical Revision 30 <br /> Seepwater Detention Berm Road Raise Project <br /> The Seepwater Detention Berm Road Raise Project was approved as Technical Revision No. <br /> 30 to Mine Permit No. M-1977-342 on September 19, 2018. This project is located at Climax <br /> Molybdenum Company's Henderson Mill in Grand County. The project involved the <br /> construction of an embankment raise of the access road berm for the Primary Seepwater <br /> Collection and Detention Area (SDA) below 1 Dam. The undersigned was responsible for the <br /> design of the seepwater berm road raise. <br /> Henderson Mill personnel have substantially completed the construction of the project. The <br /> design earthwork raise was achieved. The 1 Dam Primary SDA volumetric storage capacity <br /> increased from 29.5 acre-feet to 85.4 acre-feet, which is greater than the design criteria of 68 <br /> acre-feet to detain the 100-year ARI snowmelt. Geometric changes to the road width and <br /> length from design to construction were for access and traffic flow considerations and do not <br /> affect the design storage capacity or road berm stability. Record Drawings of the project are <br /> attached. <br /> Pursuant to Rule 7.3.2, the Professional Engineer that has signed and sealed below certifies <br /> that the project was completed in general conformance with the approved design as submitted <br /> to the Division of Reclamation, Mining, and Safety. This statement is based in part on <br /> information that has been provided by others. <br /> O�'Ojq�C�ti <br /> �CC 48387 <br /> .�v <br /> December 13, 2019 <br /> Trevor E. Mugele, P.E. Date <br /> W. W. Wheeler and Associates, Inc. <br />