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CM0001466 <br />Climax Mine - Robinson Lake Pump Station Replacement <br />® Eagle County 1041 Application Submittal <br />of Climax's Mine Reclamation Permit (#M-77-493) issued by the Colorado DRMS. As a Designated <br />Mining Operation (DMO) under Rule 7 of the Colorado Mined Land Reclamation Board's Mineral Rules <br />and Regulations, an Environmental Protection Plan is required to describe how areas that have the <br />potential to be affected by designated chemicals, toxic or acid-forming materials, or acid mine drainage <br />will be protected. As with EPFs throughout the site, those in the Eagle River watershed (including the <br />Robinson Lake Pump Station) have been highly effective in containing and controlling the release of <br />potential contaminants during the recent history of the mine, allowing Climax to continue its stewardship <br />of water quality in the headwaters of the watersheds in which the site is located. <br />Robinson Lake serves as a collection system to collect and retain process water return from the Tenmile <br />and Mayflower tailing storage facilities, seepage from beneath the 1 Dam (Robinson tailing storage <br />facility), seepage from beneath the Robinson Lake Dam, and seepage from beneath the Eagle Park <br />Reservoir Dam (4 Dam). The Eagle Park Reservoir seepage collection and pump station will remain in <br />place and fully functional until such time that seepage from beneath the dam meets water quality <br />standards for this segment of the Eagle River. Environmental protections associated with the Project <br />include: system alarms and Project Logic Control (PLC) connected telemetrically to the mill control room <br />to monitor water level and pump operations; an existing grout curtain installed below Robinson Lake dam <br />(Robinson Seep Cutoff Wall) to prevent potential seepage from entering Eagle Park Reservoir, and <br />features to provide secondary containment around the section of pipe below the Robinson Lake dam and <br />provide for the collection of water that may have to be drained from the pipeline to accommodate system <br />repairs (water to be managed through Robinson Seepwater Pump Station). All of these environmental <br />protections and the associated monitoring performed in accordance with the EPP serve to ensure the <br />protection of surface water quality. <br />Specific features of the EPFs currently in place, and to be maintained, between Robinson Lake and Eagle <br />Park Reservoir are identified on Figure 3 and on the Overall General Arrangement Drawing for the <br />Robinson Seep Pumping System, included in Attachment C. As indicated on Figure 3 there are two <br />existing interceptor ditches that divert water from unimpacted areas (from outside of the affected lands <br />boundary) around or into Eagle Park Reservoir. An existing containment pond and pump station <br />(Robinson Lake Seepwater Pump Station) is located between these two interceptors and below the <br />Robinson Lake Dam. The grout curtain, referenced above, intersects the drainage area below Robinson <br />Lake at the location of the containment pond embankment (identified as the containment wall on the <br />General Arrangement (GA) Drawing in Attachment C). This containment pond is located at the lower end <br />of the existing process water containment system (see Attachment C GA Drawing) and captures <br />stormwater run-off from the Robinson Lake Pump Station area, below the dam, and seepage from the <br />Robinson Lake Dam and pumps the water back into Robinson Lake. The new Robinson Lake Pump <br />Station (RLPS) pipeline will be constructed to include secondary containment from the pump station to <br />• <br />12 <br />