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Technical Revision (TR-28) Climax Molybdenum Company <br /> Environmental Protection Plan Permit No. M-1977-493 <br /> Potential Area of Potential Contaminant Direct(Governing) Internal Controls <br /> Impacts Sources EPF/Control <br /> (PDWTP), East <br /> Interceptor, West <br /> Interceptor, <br /> Pit Dewatering <br /> S stem <br /> TDL, <br /> Tailing stored in TSFs 2 Dam, <br /> 3 Dam, <br /> 5 Dam <br /> Diversion structures to <br /> prevent runon and to direct Material <br /> Acid-generating overburden impacted runoff to segregation, <br /> materials treatment facilities, concurrent <br /> collection drains beneath reclamation <br /> and adjacent to OSFs <br /> T-5.9 Arkansas River Watershed <br /> T-5.1.1 Potential Sources of Contamination <br /> The upper Arkansas River Watershed contains portions of the Climax site that supported the historic <br /> underground mining operations. Prior to closure of the underground mine, the entrance to the <br /> underground operation at Climax was through 5-Shaft and the Storke Portal at the Storke Yard just east <br /> of the hairpin turn on Highway 91, in the upper Arkansas River Watershed. <br /> When the underground operation was terminated in December 1994, equipment was salvaged and <br /> pumping was curtailed allowing the deeper workings to be inundated. Water in contact with sulfide <br /> mineralization underground meets the definition of "Acid Mine Drainage" in Rule 1.1 (2), and thus, is a <br /> potential source of contamination to the upper Arkansas River Watershed should water levels rise <br /> uncontrolled. Storm water becomes impacted as it passes through the open pit area and collects in the <br /> underground mine workings. Former underground workings and the open pit are connected to the 5- <br /> Shaft located in the Storke Yard area and, as described below, a pumping station installed in 5-Shaft <br /> maintains the water level by pumping water through the Storke Pipeline to the ETDL and water <br /> treatment/process water circuit in the Tenmile Creek Watershed. <br /> The Storke Yard historically incorporated some mine waste rock material for construction fill. The areas <br /> of the mine in the upper Arkansas River Watershed have been the focus of major reclamation activities <br /> since the late 1980s. Equipment was removed and buildings were demolished in preparation for final <br /> reclamation of the Storke Yard in 1995 and beyond. Impacted water from the Storke Yard area is <br /> directed to the Storke Wastewater Pump Station, described below. In addition to historic Climax <br /> operations, there are other non-Climax, abandoned mined land (AML) features present in the upper <br /> Arkansas River Watershed. As part of previous reclamation activities in this area, some impacted water <br /> from these AML features is directed to the Storke Wastewater Pump Station. <br /> A project to restore a buried segment of the East Fork Arkansas River running along the south side of the <br /> Storke Yard was completed in 2008. The area of the Arkansas River to the south-southwest of the Storke <br /> Yard was reclaimed in the late 1980s into the early 1990s. This area terminates in the gravel pit at the <br /> Climax property line. The East Fork Arkansas River runs through this reclaimed gravel pit before leaving <br /> the property and groundwater under the direct influence of surface water in this area is the source of <br /> domestic water for the mill as described in AM-06 Exhibit G —Water Information. <br /> Mine development work includes improvements to an existing haul road along Ceresco Ridge (TR-22). <br /> Storm water runoff from this area is managed to prevent impacts to the Arkansas River. <br /> EPP: Version R4 T-18 August 2018 <br />