2010-06-04_PERMIT FILE - C1982056A (10)

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• Determination of baseline surface and ground water quality and quantity conditions • Identification of normal seasonal and areal variations in baseline levels • Definition of the relationship between surface and ground water systems • Definition and evaluation of potential mining related impacts on the area hydrologic system • Identification and evaluation of protection and mitigation measures • Evaluation of the significance of potential mining related impacts given the factors of baseline conditions, hydrologic connection, mitigation measures, relative contributions, time constraints and water use permits. It should be noted that discussion of "probable hydrologic consequences" does not imply actual adverse impacts. Generally, the probable hydrologic consequences discussed will not have any long -term adverse effects on the area hydrologic balance. The scope and analysis of probable hydrologic consequences predictions has focused on quantifying the impacts that may be expected to occur based on our understanding of the site hydrology. These predictions will be re- evaluated as observed effects are measured by the on -going and proposed monitoring program as described in Exhibit 14, Hydrologic Monitoring Plan. For purposes of the hydrologic discussions, the present and future mining area has been subdivided into mining districts. • North Mains and portal area (NMS) • 1 - South Panel, Southwest Mining District (Panels 1 -SW to 3 -SW) and the South Panels (Panels 1 -Left to 6 -Left): the Southwest Mining District (SWMD) • Panels 2 -Right to 9- Right: Eastern Mining District (EMD) • Reserves north of the EMD: Northern Mining District (NMD) • Reserves north and west of the SWMD: Western Mining District (WMD) • The projected ground and surface water monitoring plan has been designed to detect impacts to these respective systems. TCC will continue to monitor these systems as presented in Exhibit 14. The North Mains presently extend to the northern limit of the SWMD and the EMD. Mining in the SWMD was completed in 1996, and the area subsequently sealed. As of June 1999, mining of the EMD was approximately 65percent complete. The NMD is planned to be developed next. The mining activities within the presently active EMD consist of longwall mining operations in eight panels. These panels are approximately 11,500 to 20,000 feet long and 850 feet wide. The panels are numbered from "9- Right" for the northern-most to "2- Right" for the southern-most panel. The analysis of subsidence effects due to longwall mining in the EMD on the surface and ground water hydrology in the study area is based on the site - specific morphologic, hydrologic, and hydrogeologic characteristics. The results of subsidence analysis presented in Exhibit 7E, Prediction of Subsidence, Eastern Expansion at the Foidel Creek Mine, used in the assessment of the effects on hydrology. The mining activities within the NMD, subject to PR 99 -05, consist of longwall mining operations in five panels. These panels are approximately 11,500 to 20,000 feet long and 1000 feet wide. The panels are numbered from "12- Right" for the southern-most to "16- Right" for the Northern-most panel. The analysis of subsidence effects due to longwall mining in the EMD on the surface and ground water hydrology in the study area is based on the site - specific morphologic, hydrologic, and hydrogeologic characteristics. The results of subsidence analysis presented in Exhibit 4e -3, Prediction of Subsidence, NMD, used in the assessment of the effects of hydrology. 0 PR09 -08 2.05 -132 04/22/09