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TR -18 to Permit M- 1977 -342 <br />Environmental Protection Plan <br />11. SURFACE WATER QUALITY DATA <br />11.1. Local Water Uses and Standards <br />Mine: Adjacent to the Henderson Mine, Segment 4 of Clear Creek runs from the source of the <br />West Fork of Clear Creek to the confluence with Woods Creek and is classified as Aquatic Life <br />(cold) Class 1, Recreation E, Water Supply, and Agriculture. Downstream of the Henderson <br />Mine, Segment 5 of Clear Creek runs from the confluence with Woods Creek to the confluence <br />with Clear Creek and is classified as Aquatic Life (cold) Class 1, Recreation E and Agriculture. <br />Stream segments are noted, relative to Mine operations, in Figure 1. <br />Mill: Adjacent to the Henderson Mill, the Williams Fork River, from the source to the confluence <br />with the Colorado River, is Segment 8 of the Upper Colorado River basin. This segment is <br />classified as Aquatic Life (cold) Class 1, Recreation E, Water Supply, and Agriculture. Stream <br />segment location is noted, relative to Mill operations, in Figure 2. <br />11.2. Surface Water Quality Data <br />The CDPS Permit requires sampling and monitoring at both the Mine and Mill sites. A large <br />database of surface water quality data exists in the public record and on file as part of this permit. <br />Surface water quality data indicates that Mine and Mill operations are not adversely impacting <br />water quality downstream of the sites. <br />Surface water data upstream and downstream of the Mine and Mill is included in Appendix H <br />"Quarterly Surface Water Quality Data" for the past five successive calendar quarters. <br />TR -16 stipulates that ongoing surface and groundwater monitoring, including upstream and <br />downstream of the mine and mill sites, will be conducted and submitted to the DRMS. The <br />ongoing collection of this data will be sufficient to provide a basis for the evaluation of <br />reclamation performance standards and the adequacy of Environmental Protection Facility <br />design, maintenance and operation. <br />Climax Molybdenum Company <br />Henderson Operations <br />October, 2012 <br />Page 31 of 40 <br />