2023-07-27_REVISION - C1981038 (10)

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A small shop,sewage treatment and substation are still in place at the site.Although mining has ceased, the unit train loadout is still being utilized as a coal mining support facility. All facilities and coal handling structures are in compliance with the rules and regulations. III. Hydrologic Balance - Rule 4.05 Sediment Ponds and Other Drainage and Sediment Control The drainage and sediment control system designs at the mine and loadout were reviewed for compliance with Rules 2.05.3(4) and 4.05. This information is briefly described in Section 2.05 of the PAP (Volumes 1 and 7). Substantial design detail can be found in Volumes 6A, 8 and 8A of the PAP. The Bowie No. 1 mine plan was designed to minimize the impacts of the project on the surface water hydrology of the region. Disturbed area drainage from the East Mine benches, parking area, west portal fill, and loadout site were collected and treated on the site. Four sediment ponds collected disturbed area drainage from the mine benches. Another pond controlled sediment generated by the West Ridge Waste Pile. One pond controlled drainage from the timber storage area (i.e., training trailer area and ROM area), and two ponds collect drainage from the disturbed areas of the loadout, truck scales, and highway coal stockpile area. The reclamation activities associated with SL-6 removed the five ponds at the East Mine and the one pond at the timber storage area. The West Mine portal bench area drained to one sedimentation pond except for exempted portions of the fill face and the ventilation fan facilities,which had small area exemption waivers (SAES). With the reclamation work at the West Mine portal bench area, the backfilled and graded area now drains to two sedimentation ponds above the culvert in East Roatcap Creek. Small area exemptions have also been approved, as discussed above. Details can be found in the approved permit application, Volumes 8 and 8A. Alternative design criteria and specifications have been approved for use in sediment pond design and/or construction. This decision is based on a thorough analytical demonstration by a qualified professional engineer that the resulting sediment pond will be environmentally sound and structurally stable, taking into consideration physical, climatological, and other characteristics of the site (4.05.6(11)). The Division has granted small area exemption status from use of sediment ponds to several areas of the Bowie No. 1 Mine (SAES). These exemptions are justified by: • The limited size of the areas • 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 23