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Using the scenario above and fora 25-yr 24-hr event, Table Att 2.05.3(3)7-1 shows the disturbance details and run-off volumes for the annual topsoil disturbance for years 2003 through 2008. This "traveling" pond procedure will be repeated in the 2008 to 2013 Permit renewal until the coal pit passes to the west of the Pond 010 proposed location sometime in 2013. Then, since the coal pit will no longer function as a sediment control device, Pond 010 will be built. Map 2.05.3(3) shows the drainage basin for Pond 010. The SEDCAD4 engineering hydrologic runoff calculations for the Small Areas Exemption and the "Traveling "Pond areas can be reviewed in Attachment 2.05.3(3)-7. The above alternative sediment control techniques will meet all applicable state and federal effluent limitations. The area exemption effectiveness will be demonstrated by computer simulation or real-world event sampling. Discharge Structures • Discharge from the sedimentation pond, diversions and pit dewatering will be controlled by energy dissipators, riprap channels, and other means or devices, where necessary, to reduce erosion, to prevent deepening or enlargement of stream channels, and to minimize disturbance of the hydrologic balance. Discharge structures will be designed according to standard engineering design procedures. Transportation Facilities Haul Roads. The following describes the design and construction of haul roads at the New Horizon Mine. General Reouirements. WFC will construct, maintain and reclaim haul roads to minimize erosion and siltation, air and water pollution and damage to public and private property. To the extent possible, using the best technology currently available, haul roads will not cause damage to fish, wildlife, or related environmental values and will not cause additional contributions of suspended solids to stream flow or to runoff outside the permit area. 2.05.3(3) - 21