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and wetting solution, is not identified as a hazardous substance, and contains no volatiles or cutback <br />solvents. Coherex (typically mixed with water at a ratio of 1 part Coherex to 5 parts water) has been <br />applied in the past at Climax and is currently applied annually to exposed tailing at the Henderson Mill to <br />control dust, with no known or identified environmental concerns. Coherex will be stored in a tank, <br />within secondary containment, near the west abutment of 2 Dam in accordance with the Climax Spill <br />Prevention Control and Countermeasures (SPCC) Plan/Materials Containment Plan (MCP). <br />- Sec 5.2.1 Will there be surveyed markers placed for visual assessment of the required 6ft of freeboard <br />and/or minimum 500ft beach width to make sure upper operating level is not exceeded? <br />Response: Freeboard will be monitored using water pool level measurements at the Tenmile Decant <br />Structure that are collected and recorded on a daily basis and dam crest elevation, which will be <br />determined by surveying after each lift of the dam crest is completed. These measurements are currently <br />recorded manually, but the installation of a water level probe to automatically record the water level is <br />planned for 2012. As described in Section 6.2 of the O &M Plan, the minimum beach width will be <br />monitored using an electronic distance meter or other suitable method, which could include marker posts <br />installed 500 feet upstream of the dam crest. <br />- Sec 5.3.2 Are there plans to install a flume to monitor the flow rate of discharge from South Portal of <br />the Tenmile tunnel as suggested? <br />Response: The installation of a flume at the South Portal is currently scheduled for the summer of 2012. <br />- Sec 6.1/6.2 The trigger levels for the piezometer monitoring program need to be specified. <br />Response: The text has been revised to state, "...system will trigger notification at designated <br />fluctuations. The notification indicates review is required when phreatic elevation increases greater than <br />5 feet in a one -month period, greater than 5 feet in a three -month period, and greater than 10 feet in a one- <br />year period. See and insert attached replacement Section 6 pages for updated text (revised text included <br />on page 6 -1). <br />- Sec 6.3 What is the expected response time for the URS on -call support if there are anomalies observed? <br />Response: URS representatives are available 24 hours per day and are generally mobilized to the site <br />within 2 to 4 hours after notification and request of on -site support from Climax. <br />- What are the plans to implement other recommendations, such as additional monitoring wells, <br />monitoring /sampling tailings characteristics, etc. that are presented in these documents (specifically <br />Section 5 of the Stability Analysis)? These processes need to be in place ASAP so that startup conditions <br />can be monitored, and any required adjustments to the process as outlined can be made in a timely <br />fashion. <br />Response: The following bullets are expanded process and implementation recommendations for the <br />items included in Section 5.2 of the stability report (new text below is underlined). Note the third <br />recommendation has been combined with the first recommendation. <br />• Perform beach profile sampling to evaluate newly deposited tailing to verify the material <br />properties are consistent with those envisioned in the design. This will include evaluating the <br />whole tailing gradation as it compares to past whole tailing gradations. Profile sampling should <br />be performed near the end of the first spigot season (estimated late summer /early fall 2012). The <br />2 <br />