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<br />Mr. Dan Mathews <br />June 13, 2008 <br />Page 4 <br />YPM-6-2(Options 1 and 2), 6-3(Option 2), 6-4, 7, 8, 10, 17, and 20 to ensure that the profile <br />information is consistent with the slope data provided on Figure 13-12.3 and the supporting <br />SEDCAD demonstrations. <br />17. There was no profile provided for YPM-3-2A on Exhibit 20-2B. If appropriate please add this <br />charnel profile to Exhibit 20-213. <br />18. Revised channel YPM-8 has a nearly 90° turn at the lower end of the channel. This is an abrupt <br />transition and is not a geomorphically stable configuration. The original approved design <br />showed a more gradual bend near the lower end. Please explain why the abrupt bend in the <br />channel configuration has been added to the lower end of the channel or consider revising the <br />channel to a more a stable configuration. <br />19. The Permanent Impoundment Demonstrations Appendix 20-1.2 for Ponds 010, 013, and 014 <br />will need to be amended to include specific information regarding water quality. <br />The water quality discussion provided for each of these ponds is brief and only generally <br />addresses the permanent impoundment requirements of Rules 4.05.9(13) (a). SCC did not <br />adequately demonstrate that water quality in the ponds and discharge from the ponds meet the <br />provisions and criteria of 4.05.9(13) (a). In each of these demonstrations, surface water quality <br />data and details are referenced in the Annual Hydrology Reports. However, the water quality <br />demonstration needs to be in the permit application package. Please provide a demonstration <br />similar to those provided for the Seneca II Mine for permanent pond demonstrations for each of <br />the Yoast Mine ponds that are proposed as permanent features. This should include a <br />comparison of permanent pond effluent to appropriate stream segment standards. Please refer <br />to the Seneca II Mine Permanent Impoundment Water Quality and Water Right Demonstrations <br />permit application package pages 7-379 through 7-387. <br />20. In the Permanent Impoundment Demonstrations Appendix 20-1.2, SCC indicates that they have <br />a water right for Pond 010 and no water rights for Ponds 013 and 014. For Pond 010, please <br />provide the water right decree or reference its location and summarize the decreed amount and <br />Case No. in the Permanent Impoundment Demonstration. For all three permanent pond <br />requests (010, 013, and 014) appropriate application materials should be submitted to the <br />Office of the State Engineer for the permanent structures. All impoundments that are intended <br />to be retained as permanent postmining features shall comply with applicable State Engineer <br />rules and regulations. Under the State Engineers rules a permit is required but water rights are <br />not required for Livestock Water Tanks or Erosion Control Dams, which may be applicable to <br />Ponds 013 and 014. State Engineer and DRMS approval shall be obtained before bond release <br />can occur. <br />21. The Permanent Impoundment Demonstration for Pond 012 is not appropriate at this time since <br />the pond configuration is not stable and a new design and subsequent as-built will be submitted <br />for Pond 012. Please withdraw the Permanent Impoundment Demonstration for Pond 012 from <br />TR-37.