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The PDWTP return line will be constructed of 24 -inch welded steel pipe to prevent leakage and, like <br />the supply line, also will be inspected each shift during times of usage. The PDWTP return line is <br />only intended for intermittent use. It will be used for several days during start-up of the PDWTP to <br />return water that does not meet treatment objectives while the system is calibrated for optimal <br />treatment effectiveness. The return line also will be used during operational upsets or to return <br />storm water from the Events Pond. <br />Due to the alignment of the pipeline along existing roads, a portion of the return pipeline will be <br />below the elevation of the return pumps at the PDWTP such that some water would remain in the <br />pipeline at all times. After the pipeline is used to discharge "off- spec" water to the Mayflower TSF, <br />the pipeline will be drained. However the section of pipe below the elevation of the pumps will <br />retain water (approximately 1,700 feet of pipeline). This section of pipeline will be lined to <br />minimize corrosion from the standing water. To prevent the potential for environmental impacts <br />from leakage, the pipeline will be flushed with treated water once the plant is again meeting <br />discharge limits. Given the limited usage of the return line, visual inspections, and the operational <br />procedure of flushing the line with treated water after use, any environmental risk from leakage <br />should be minimal to nonexistent. <br />Climax Mine has an excellent environmental record and is cognizant of potential water quality <br />impacts that could affect Tenmile Creek. Additional verification of surface water and groundwater <br />protection below the Mayflower TSF and PDWTP will be achieved through monitoring at Outfall <br />001 in accordance with the Climax CDPS permit. <br />- I don't see any reason at this time that DRMS couldn't include the wetlands mitigation project in <br />the existing bond — especially considering the timeframe for completion. Do you need any <br />"specific" language from the DRMS to satisfy COE or do we just need to approve the TR with the <br />mitigation plan included as it is? <br />Response: Based on conversations with the Corps of Engineers, Climax understands that the <br />language in Section 4 accompanied by the DRMS TR -19 approval letter should be sufficient. <br />Climax appreciates the Division's consideration of these responses and looks forward to receiving <br />approval of Technical Revision TR -19. Please feel free to contact me at 719- 486 -7584 if you need <br />anything further. <br />Sincerely, <br />Raymond Lazuk <br />Environmental Manager <br />attachments <br />3 <br />