1995-08-11_REVISION - M1977493 (9)

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0 Storke Yard Reclamation Proiect: Dismantling of structures and demolition of buildings and foundations in the Storke yard began in 1993 when underground mining operations were discontinued. This program of building reduction continued through 1994 and was expanded to include removal of or approved burial of building debris at the area. Reclamation of the area will continue into 1997. In 1995, building demolition was completed leaving only the hoist, hoist house, fan house, and the compressor building intact. The area was graded for drainage control, and capped with geochemically benign aggregate and growth media material stored at the area (Appendix C). Revegetation of this site is scheduled'for late 1995. This project also will include reclamation of the Arkansas River channel presently routed in culvert under the yard area. This reclamation project may be carried to completion in 1997. Reclamation of the Storke yard is considered an EPF in the passive sense. Once completed and established, seepage and stormwater/snowmelt run-off should be reduced and will be specifically routed to the Arkansas River or to the pump station if testing indicates the presence of contamination. 5.2 Eagle River Watershed 5.2.1 Potential Sources of Contamination a The upper watershed of the East Fork of the Eagle River w' PP g rthm the Climax property contains the following sources of potential contamination: 1) Eagle Park Reservoir; 2) Robinson Reservoir (aka: Robinson Lake); and a 3) a portion of the Robinson tailing impoundment. As Figure 1 illustrates, these potential sources of contamination are in-line, with Eagle Park Reservoir being the lowermost or last exit point from the Climax property. Drainage or release of contaminants from Robinson tailing impoundment (the uppermost source) would first enter Robinson Reservoir. Any release or overflow from Robinson Reservoir would enter the Eagle Park Reservoir before impacting of the Eagle River and its environs below the Climax boundary. The Eagle Park Reservoir (aka: Oxide Pond, No. 4 Dam Reservoir) was constructed in 1965 to impound tailing material from the oxide ore processing facility at Climax. Oxide ore processing was discontinued in 1968. The tailing material and sediments in this impoundment are acidic and contain elevated levels of metals. Seep water emanating from the toe of the dam likewise is acidic (Appendix G). The impoundment also presently serves as a seepage collection facility for the upstream Robinson Reservoir. In 1993, a project was initiated to convert the Eagle Park Reservoir to a fresh water impoundment to allow Climax to sell storage and water rights. These rights were purchased by Vail Associates. Such a conversion of this impoundment requires draining of contaminated water, removal of tailing material and contaminated sediments, and prevention of Robinson Reservoir 16