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There are no designated chemicals stored or utilized in the Eagle River watershed. <br /> 5.2.2 Environmental Protection Facilities <br /> In the Eagle River watershed affected by Climax Mine operations, there are four (4) controls <br /> which are considered EPFs. <br /> No.I Dam: Robinson Tailing Impoundment: The No. 1 Dam acts as the first line defense EPF <br /> in the Eagle River watershed by containing tailing material within the Robinson impoundment and <br /> by acting to contain an industrial process water pool. This latter characteristic is discussed in <br /> more depth in the section on the Ten Mile Creek watershed. <br /> No. 1 Dam was upgraded and reconfigured in a project which was initiated in 1989 and <br /> completed in 1992. Briefly, this project entailed construction of a large diameter toe drain <br /> collection and discharge system, flattening of the slope of the dam from approximately 2h:1v to <br /> approximately 4h:ly, and armoring of the face of the dam with rock material. The dam was <br /> revegetated at the end of this project. <br /> As mentioned in Section 5.2.1, a proposed seepage collection system for No. 1 Dam is being <br /> investigated. This project would convert the Robinson Reservoir into a fresh water storage <br /> facility. This proposed project could eliminate the present use of Robinson Reservoir as a <br /> seepage and toe drainage/process water collection system and construct a seep/drain water <br /> collection system dedicated to the Robinson tailing impoundment. Conceptually, this system <br /> would entail construction of a positive cutoff through the overburden to bedrock; construction of <br /> an earthfill dam and associated collection system and retention pond at the toe of No. 1 Dam; <br /> establishment of a return water pump station or water treatment system. If this project <br /> develops, plans will be certified and submitted to DMG as per the Rules. <br /> Another component of the No. 1 Dam/Robinson tailing impoundment EPF is the capping and <br /> reclamation program. As discussed earlier,No. 1 Dam was graded and capped in the early 1990s. <br /> Capping of the remainder of the impoundment with rock material from the E-Dump and the open <br /> pit cirque area was initiated in 1993 and was essentially complete in 1994. This cap is expected <br /> to slow infiltration of surface water into the tailing material and reduce available oxygen <br /> (particularly during the winter months) necessary for acid production. <br /> Robinson Reservoir and Pump Station: The next control system considered to be an EPF in the <br /> Eagle River watershed is the Robinson Reservoir system including the reservoir proper, the dam, <br /> and the return water pump station located directly below the dam. Robinson Reservoir serves as <br /> a collection system to collect and retain seepage and drainage from beneath No. 1 Dam and from <br /> 18 <br />