2021-08-06_PERMIT FILE - C1982056A (2)

Home Browse Search

• 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 PHC does not imply actual adverse impacts. Generally, the PHC discussed will not have any long-term adverse effects on the area hydrologic balance. The scope and analysis of PHC 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 I -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 Wolf Creek Reserves (WCR) The projected ground and surface water monitoring plan has been designed to detect impacts to these respective systems. TC will continue to monitor these systems as presented in Exhibit 14. The North Mains presently extend to the northern limit of the SWMD, the EMD, and the NMD. Mining in the SWMD was completed in 1996, the EMD in early 2001, and the NMD in late 2009, and these areas were subsequently sealed. The analysis of subsidence effects due to longwall mining 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 the subsidence analysis presented in Exhibit 7E, Prediction of Subsidence, Eastern Expansion at the Foidel Creek Mine, Exhibit 4e-3, Prediction of Subsidence, NMD, and monitoring data documenting actual subsidence effects were used in the initial assessment and subsequent reviews of the effects on hydrology. TR13-83 2.05-132 11/03/14