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® COLORADO OPERATIONS <br /> Climax Molybdenum <br /> �"- Henderson Mine and Mill <br /> P.O. Box 68 <br /> A Freeport-McMoRan Compaj Empire, CO 80438 <br /> Phone(303)569-3221 <br /> Fax(303)569-2830 = a Cn <br /> TR30 MJ j 'Y <br /> � aCD <br /> � � Z <br /> ' v <br /> September 19, 2018 5 m <br /> RECEIVED <br /> Sent Via Email and UPS#: 1Z8046410193430496 <br /> SEP 2 0 2018 <br /> Mr. Peter Hays <br /> Division of Reclamation Mining and Safety D SIONOF <br /> RECLAMATION ev <br /> 1313 Sherman St., Rm. 215 MINING AND SAFE <br /> TY <br /> Denver, CO 80203 <br /> RE: Climax Molybdenum Company, Henderson Mill, Permit No. M-1977-342, Technical Revision <br /> 30, Mill-EPF 1.5— Seep Water Collection and Return System Improvements i� T <br /> ~O IN <br /> 3� Cl) <br /> Dear Mr. Hays: <br /> During your recent visit to the Henderson Mill on August 30, 2018, a project to improve the 1 Dam Primary <br /> Seepwater Detention Area was briefly discussed. This area is part of Mill-EPF 1.5—Seep Water Collection <br /> and Return System. Enclosed is a technical memorandum and design drawings that describe the basis for <br /> these improvements, the expected outcome and provide the details for construction. <br /> These improvements consist of raising the seep water detention berm approximately two and a half feet, <br /> extending portions of culvert under the road that direct water to the Ute Park Pump Station, raising the gate <br /> operator electronics, and installing new communications cabling for the gate controls. These improvements <br /> will allow for additional storage capacity of the Seep Water Collection and Return System EPF to contain <br /> various hydrologic events or for emergency storage during an upset condition associated with the Ute Park <br /> Pump Station. <br /> Please let me know if you need any additional information to complete your review of this request. <br /> Regards, <br /> Aaron Hilshorst <br /> Chief Environmental Engineer <br /> Henderson Operations <br /> Climax Molybdenum Company <br /> Enc. W. W. Wheeler&Associates, Inc. —Technical Memorandum — Henderson Mill Seepwater <br /> Detention Berm Road Raise Hydrologic Design Basis <br /> W. W. Wheeler&Associates, Inc. —Seepwater Detention Berm Road Raise IFC Drawings <br /> cc: M. Hamarat, Climax <br /> D. Benbow, Climax <br />