1999-12-14_GENERAL DOCUMENTS - C1981038

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The drainage and sediment control system at the mine and loadout were reviewed for compliance with Rules 2.05.3(4) and 4.05. This information is briefly described on pages 27 to 40 and pages 48 to 50 of Rule 2.05. Substantial design detail can be found in Volumes 8 and 8A, Sheet 6, of the Bowie No. 1 West Mine design specifications, Volume 6, Map 6A-2C of the Waste Disposal Appendix, and Map 6A-SD of the Reclaimed Configuration Appendix. Findines - The applicant has demonstrated that sediment ponds and/or treatment facilities will function properly to ensure [hat disturbed-area drainage will meet the effluent limitations of 4.05.2 and the applicable State and Federal water quality requirements for downstream receiving waters. The Division has granted small area exemption status from use of sediment ponds to seven azeas of the Bowie No. 1 Mine due to the limited size of the areas and due to the fact that ponds and treatment facilities are not necessary for the drainage to meet the effluent limitations of Rule 4.05.2 and applicable State and Federal water quality standards for receiving streams and also due to the fact that no mixing of surface drainage with a dischazge from underground workings will occur. The small areas to be exempted are the Bowie No. 1 West Mine fill outslopes (north and south), Bowie No. 1 West Mine vent fan site, training trailer area outslopes, [he silo area railroad outslopes, the Bowie No. 1 main facilities fan area and the south portion of the highway coal stockpile area. See permit application Section 2.05, page 113, 113a-c, Volume 8, pages SAE 1-30, and Maps 8-lA, 8-2, 8-3, 8-6, and 8-7 (4.05.2(3)(b)(i)). Stream Channel Diversions - Clean water diversions above the main facilities areas of both the Bowie No. 1 Mine and the Bowie No. 1 West Mine direct undisturbed area flows around the facilities areas [o minimize surface water flow through these sites. A system of lined and unlined ditches convey waters from the disturbed areas to the sediment ponds. Design details can be found in the approved permit application, Volumes 6, 8, and 8A. In order to minimize water quality impact to water flowing through the Bowie No. 1 West Mine area, water from East Roatcap Creek is diverted to West Roatcap Creek. To verify that no water is lost through diversion of the Overland Ditch, surface water monitoring point SW-09 was moved to, and is currently monitored at, the point of the diversion from East Roatcap Creek. Sedimentation Ponds - The Bowie No. 1 mine plan is designed to minimize the impacts of the project on the surface water hydrology of the region. Disturbed area drainage from the mine benches, parking area, west portal fill, and loadout site is collected and treated on the site. Four sediment ponds collect disturbed-area drainage from the mine benches. Another pond 28