2011-02-15_REVISION - C1980004 (2)

Home Browse Search

Corey Heaps McClave Canyon Mining, LLC February 15, 2011 Page 18 the parameters included in the Leachate and Mine Water Metal Analysis should be included on the parameter list. Please update Section 2.05.6 with an appropriate groundwater parameter list for laboratory analyses. 90. The surface water monitoring plan proposed in PR -2 does not match the currently approved surface water monitoring plan. On revised permit text page 2.05 -63, it is stated that the surface water monitoring stations SW -1, SW -4 and SW -8 are to be sampled quarterly for field parameters and semi - annually for the full suite parameters. However, as stated on approved permit text page 4 -20, SW -1 and SW -8 are to be sampled quarterly for the full suite analyses and for flow. Concerning SW -4, however, it is not clear to the Division if SW -4 is currently part of the McClane Mine monitoring program. As also stated on page 4 -20, SW -2 and SW -5 are to be sampled twice a year for the full suite parameters, one time during spring snow melt and one time during a storm event in the spring or summer. Flow is to be measured at SW -2 in addition at SW -1 and SW -8. Please justify the change in the surface water monitoring program or revise the PR -2 submittal to conform to the currently approved monitoring program. The Division also requests that flow be added to Tables 1 and 2 on revised pages 2.0564 and 65. 91. On revised page 2.05 -66, it is stated that water monitoring results will be submitted to the Division annually. However, the currently approved submittal process, as stated on permit application page 4 -20, states that the quarterly sampling results will be submitted to the Division within one month of the end of the quarter. Please either justify this change or revise the permit text to conform to the currently approved plan. Also, please include the timing of the submittal of the discharge monitoring reports in the permit text discussion. 92. In Appendix M, the Sedcad hydrology designs use 2.4 inches for the 100 year -24 hour precipitation event. However, it appears from the NOAA Atlas 2, Volume III that the.value should be 2.6 inches. Please explain the use of 2.4 inches or provide revised hydrology designs for those structures using the 100 year -24 hour precipitation event. 93. Please provide the Subwatershed Hydrology Detail design sheets and the Structure Summary design sheets for the 100 year -24 hour precipitation event Sedcad run for the operational configuration and the 10 year and 100 year precipitation event Sedcad runs for the reclaimed configuration. 94. What is the reclamation plan for the existing sediment pond before it becomes the topsoil storage area as proposed in PR -2. Please provide a discussion in the permit text that describes the method for reclaiming the current sediment pond, including what will be done with the pond cleanings. 95. It appears that page 35 of Appendix M should actually be numbered page 31. If this is correct, please revise Appendix M accordingly.