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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br /> Rationale - Page 16. Permit No: CO-0000248 <br /> CHANGES TO PERMIT AFTER PUBLIC NOTICE PERIOD: (Continued) <br /> demonstrations of compliance with the copper and/or cyanide standards at <br /> Frisco Bridge are shown, then instream monitoring by Climax may cease and <br /> higher discharge flows may be resumed. <br /> Based upon the demonstration of greatly improved treatment during 1987 and <br /> 1988, as well as the lowered downstream concentrations during this period, <br /> the Division has determined that no additional instream study is necessary <br /> for evaluation at the 9000 gpm discharge flows. Thus, this study is no <br /> longer required. <br /> However, the quarterly groundwater monitoring is still required, and a <br /> reduction in this monitoring frequency can not be considered until a <br /> sufficient data base is available for review. Typically, monitoring at <br /> groundwater wells for industrial permits is done at least on a quarterly <br /> basis. <br /> Appendix E includes the groundwater data from the first annual report. Well <br /> No. 1 is approximately 3000 feet downgradient from the Mayflower tailing <br /> pond, and Well No. 2 is approximately 4000 feet downgradient from Well No. <br /> 1. Both wells are situated near Tenmile Creek. For further information on <br /> the wells, refer to the 1987 Groundwater Monitoring Wells Annual Report. <br /> Don Holmer <br /> October 26, 1988 <br /> November 10, 1988 <br />