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The location, configuration, and components of the 6MN Mine Water Storage Reservoir installation are shown on <br />Map 24 (sheet 2 of 3), Surface Facilities and Freshwater Systems. Related design information is provided in <br />Exhibit 490, 6MN Mine Water Storage Reservoir — Design Drawings, including a design stability analysis for the <br />•pond embankment (also refer to detailed Reservoir description on pages 2.05-45.6f through 2.05-45.8). Because <br />the proposed Reservoir storage volume is greater then 20 acre-feet, design and compliance documentation have also <br />been submitted to the Mine Safety and Health Administration (MSHA) for review and approval. <br />• <br />SMALL AREA EXEMPTIONS AND ALTERNATIVE SEDIMENT CONTROLS <br />TCC has been granted several Small Area Exemptions (SAE'S) and/or approvals to utilize Alternative Sedimant <br />Controls (ASC's) within the permit area. Effective drainage and sedimentation control in these areas will be <br />achieved through the use of a number of individual or combined methods, including gravel -surfacing; erosion <br />control fabric or materials; berms; contour furrows; sediment traps; rock check dams; vegetative filters; the use of <br />silt fences, straw wattles, or straw bales; or other approved methods. Specific SAE/ASC practices are described in <br />the following sections. <br />MR09-239 2.05-82.1 09/24/09 <br />