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Technical Revision (TR-28) Climax Molybdenum Company <br /> Environmental Protection Plan Permit No. M-1977-493 <br /> upstream of its confluence with West Fork Tenmile Creek near Copper Mountain. These conditions were <br /> attributable primarily to acid mine drainage from historic mining activity within the headwaters area of <br /> Tenmile Creek. Over the past 40 years, Climax has implemented a water treatment/management system <br /> in the Tenmile headwaters area, which has included reclamation of many historic mining sites, and <br /> capture and treatment of impacted waters from many inactive mines in the drainage area. Since Climax <br /> has implemented its water treatment/management scheme, Tenmile Creek has recovered to support a <br /> viable and reproducing fishery downstream from the point of the Climax outfall. The complete <br /> responsibility accepted by Climax for water treatment/management within the headwaters area of Tenmile <br /> Creek is reflected in the Water Quality Control Commission's 1987 rulemaking regarding the Climax <br /> outfall, in which the Commission stated: <br /> The evidence in these proceedings on Ten Mile Creek have shown that Ten Mile Creek for all <br /> intents and purposes begins at the Climax property boundary at a place designated as the <br /> "Parshall Flume." It is at this point that the natural flows that are intercepted by Climax in the Ten <br /> Mile Creek Basin are channeled together and form the source of Ten Mile Creek. Hence the <br /> Commission believes Parshall Flume to be the source of the mainstem of Ten Mile Creek. Also <br /> included in this segment are all tributaries to Ten Mile Creek including those natural tributaries <br /> intercepted by Climax. (5 CCR 1002-33.11 &33.16) <br /> Storm water management information for the Climax Mine site is discussed throughout this EPP. Storm <br /> water is managed in accordance with Storm Water Permit COR-040178 <br /> T-8 Water Quality Monitoring Plan <br /> A Groundwater Monitoring Plan for the Climax Mine was previously submitted to DRMS as TR-08 in <br /> September 1995 and TR-18 in December 2011. An updated Water Quality Monitoring Plan is included in <br /> this Environmental Protection Plan as Appendix T-C. The WQMP includes points of compliance, <br /> identifies appropriate standards, and includes internal monitoring locations upgradient of Clinton <br /> Reservoir and Eagle Park Reservoir. <br /> This monitoring program is intended to provide data for (1) demonstrating that EPP requirements are <br /> being met; and (2) evaluating changes in water quality that may be related to mining and milling <br /> operations at the site. It also provides a process for identifying when changes may be occurring so that <br /> appropriate actions can be taken to prevent adverse off-site impacts. <br /> T-9 Climate and Air Quality <br /> Information regarding climate as required in the EPP Rules is in AM-06 Exhibit K— Climate Information. <br /> In addition, details regarding air emissions and the fugitive dust control plan are found in the Construction <br /> permit issued by the Air Pollution Control Division of the CDPHE. <br /> T-10 Geochemical Information <br /> Geochemical data, including acid/base accounting, pH data and metals data (both SPLP and total <br /> metals), have been summarized for TR-18 and are included as Appendix T-E. Data were collected from <br /> overburden material, road fill material, tailing material, and material from each of the TSFs. Soil samples <br /> were analyzed, as well as water samples from waste rock reactors constructed on McNulty OSF. The <br /> data are summarized in several tables identified as Tables T-E-1 through T-E-5. <br /> T-11 Construction Information <br /> Construction schedule information will be provided as new EPFs are proposed and designed. Design <br /> submittals for new EPFs will also describe the quality assurance (QA) and quality control (QC) program <br /> and measures to be employed during their construction. In general, the QA/QC program will consist of <br /> construction observation, inspection of materials for use in construction, survey control and field <br /> measurements, and appropriate field testing during construction to ensure that work is conducted and <br /> completed in accordance with the project-specific design and technical specifications. <br /> EPP: Version R4 T-36 August 2018 <br />