2010-10-12_PERMIT FILE - C1982057A (5)

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embankment because they are "dugout" structures and have a capacity of less than one acre- foot; 7. Treating traffic areas with water or dust suppressant to reduce the potential for wind and water erosion. 8. A sedimentation pond or a series of sedimentation ponds; 9. Soil surface mechanical manipulation measures that include contour furrowing, chiesel plowing, etc.; 10. Topographic manipulations that include recontouring or reshaping of graded material in a manner that minimizes the potential for soil erosion; 11. Surface protection measures that include surface stabilizers such as temporary cover crop, permanent vegetation covers, or geotextile fabrics, etc.; 12. Linear detention and filtering structures that include filter fence, straw bale barrier, brush barrier, and filter berms; 13. Measures used in conjunction with overland conveyances including check dams, sediment traps, and water level spreaders; Siltation structures or sedimentation ponds will be utilized for all major disturbed areas, except those permit areas exempted by regulation. The remaining alternative sediment control methods may be used in conjunction with the siltation structures or, in the case of the permitted areas, which are exempt (e.g., Rule 4.05.2(3) and (4)), they may be utilized individually. Small area exemptions (SAE) have been approved for • various topsoil stockpiles at the mine site and Tie-Across Haul Road (TAHR) (see Attachment 13-8, Designs for Catchment Sumps of Small Area Exemptions [SAE]). All surface mining operations will be conducted to achieve the effluent limitations of Rule 4.05.2(6) for all mixed drainage when it leaves the permit area. Sedimentation ponds or impoundments will be constructed before creating new disturbances, unless approved drainage diversions or other surface water control structures are installed. Diversion Ditches The diversion ditches or collection drains in the permit area are the following: I.D. Name Location Design (rob 13) Approval Date Ditch No. 4 II-W Attachment 13-2 1989 Ditch No. 7 II-W Attachment 13-2 1992 Clean Water Diversion II-W Attachment 13-2 1995 PR-OS 2 Revised 01/06