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King Coal Mine (C-1981-035) TR -25 Adequacy Review #2DRMS <br />SedCad Runs <br />16. Due to software issues, I have not been able to verify SedCad runs provided with this TR. I <br />may have questions in the near future regarding SedCad results. <br />DRMS Dec 2015 The SedCad runs provided adequately address the structures in place. <br />Resolved <br />Rule: 4.05.2 (1)-(8) Water Ouality and Effluent Limitations <br />This Rule addresses drainage from disturbed areas, sediment ponds, and meeting water quality <br />standards and includes: <br />o Requirement that all drainage from disturbed area be passed through a sediment pond <br />o Maintenance of sediment ponds <br />o Ponds and other treatment facilities shall be constructed as per Rule 4.05.6 <br />The water quality and effluent guidelines required by Rule 4.05.2 have been adequately <br />provided and include: Maps King II 007A, B and C. Please see requested information <br />specific to these maps. <br />Resolved <br />Rule: 4.05.3 Conveyance of Overland Flow <br />This Rule addresses flow from undisturbed areas, and includes: <br />o Requirement that temporary diversions shall safely pass peak runoff from a precipitation event <br />with a 2 year <br />recurrence interval <br />o Protecting property and avoiding danger to public health, permanent diversions shall <br />safely pass peak runoff from a 10 year event. <br />o Diversions shall be designed, constructed and maintained to prevent additional <br />contributions of suspended solids to streamflow and runoff outside the permit area. <br />The guidelines provided in Rule 4.05.3 have been adequately provided and include: <br />o Maps King II 007A, B and C. Please see requested information specific to these maps. <br />Resolved <br />o Tables of Drainage Basins, Ditch Capacities and Culvert Capacities <br />o SedCad Model Runs. I may request additional information once I can verify these <br />runs. <br />DRMS Dec 2015: The updated tables provided by GCC for Appendix 11 adequately <br />describe the surface water infrastructure and flow. <br />Resolved <br />Rule: 4.05.6 Sediment Ponds <br />This Rule addresses design, construction and maintenance of sediment ponds and other treatment <br />facilities and includes: <br />o Providing adequate sediment storage volume and periodic sediment removal <br />o Provide adequate capacity to contain or treat runoff or inflow resulting from a 10 year 24 hour <br />event. <br />The guidelines provided in Rule 4.05.6 have been adequately provided and include: <br />o Maps King II 007A, B and C. Please see requested information specific to these maps. <br />Resolved <br />Prepared by: R. Reilley December 2015 <br />File location: M:\Coal\rar\1MKingCoal\TR25 Page 6 <br />