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W. W. WHEELER <br /> & ASSOCIATES, INC. <br /> Water Resources Engineers WWW.WWWHEELER.COM <br /> 3700 S. INCA STREET 1 ENGLEWOOD, 00 B01 1 0-3405 <br /> 303-761-41 30 1 FAX 303-76 1-2802 <br /> TECHNICAL MEMORANDUM <br /> September 11, 2018 <br /> To: Geoff Niggeler <br /> Climax Molybdenum Company, Henderson Mill <br /> Parshall, Colorado <br /> From: Steven M. Maly, P.E. and Trevor Mugele, P.E. <br /> W. W. Wheeler&Associates, Inc. <br /> Re: 1333.01.13 <br /> Henderson Mill Seepwater Detention Berm Road Raise <br /> Hydrologic Design Basis <br /> The purpose of this memorandum is to present the design basis for upgrades to the 1 Dam <br /> Primary Seepwater Detention Area (SDA) at the Henderson Mill (Henderson). <br /> Background <br /> Based on the 2014 TRB recommendations, Henderson contracted Wheeler to perform <br /> evaluations of the volumetric and flow rate capacity to handle rain flood and snow flood events of <br /> the primary SDA at the toe of the Henderson 1 Dam. The seepage collection and detention <br /> system at the base of 1 Dam is formed by a berm that also serves as an access road. Raising <br /> the level of this Seep Road would increase the storage capacity in the area upstream of the berm, <br /> referred to as the 1 Dam Primary SDA. The additional storage capacity would then be available <br /> to contain various hydrologic events or for emergency storage during an upset condition <br /> associated with the pumping system. <br /> System Evaluation Results and Conclusions <br /> The evaluation included hydrologic and hydraulic modelling of the SDA and the downstream face <br /> of 1 Dam. The evaluation determined the SDA has sufficient capacity to completely detain <br /> (temporarily store, then gradually release to the Ute Park Pump Station) seepage and runoff from <br /> c\users\trevor\desktop\2018sept11_tm_design basis.docx <br />