2008-06-12_GENERAL DOCUMENTS - C1980007 (3)

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Summary • EM64--s on Resourcre Issues Residual surface tension cracks may remain in more brittle bedrock material on ridges or cliffs. • 1?1 A1tej-iiaYis,e , 41 Topographic, geologic, and soil conditions would remain in their current condition, except that natural processes, including erosion and mass wasting, would continue. Afte °ia,qE6 )e B Seven to 14 feet of subsidence could occur in over most lands in the tract and up to 14 feet of subsidence could occur if both the B and E Seams are mined. Overburdened strata would be pennanently altered through caving and fracturing, however this should not be visible from the land surface. Residual surface tension cracks may remain in more brittle bedrock material on ridges or cliffs. The movement of existing landslides and rock falls may be aggravated (two are known in the area). Other than lowering the land surface, the long-term effects are expected to be minimal and even unnoticeable to most casual observers. Overall, the topography would be similar to pre-mining conditions but at a lower elevation. Cracks would create soil disturbance, which is likely to heal a few years after mining is complete. Erosion rates could temporarily increase. An estimated 60 acres would potentially be disturbed by post-lease development activities. The movement of existing landslides and rock falls may be aggravated (two are known in the area). Other than lowering the land surface; the long-term effects would be minimal and even unnoticeable to most casual observers. Overall, the topography would be similar to pre-mining conditions, but at a lower elevation. Cracks would create soil disturbance, which is likely to heal a few years after mining is complete. Erosion rates could temporarily increase. An estimated 43 acres would potentially be disturbed by post-lease development activities. Water- Resources Ala`2e"°native A No mining-induced effects on water resources would occur. AfteF°rs tlve B Subsidence may alter surface water and groundwater hydrology. Changes in channel morphology may occur, including minor cutting, pooling, soil erosion, and sedimentation, but it would be minimal in the long-tenn. Springs may migrate a few feet, but no discernable loss of water is anticipated. Surface tension cracks could temporarily divert precipitation away (less than 200 feet) but flow would remain in the drainage. A 900- foot reach of Deep reek was subsided from longwall mining in 2003 with no apparent effects to the drainage. Ah'_-__ nzat .ve C Seven to 14 feet of subsidence could occur in over most lands in the tract. Fourteen feet of subsidence would occur if both the B and E Seams are mined. Overburdened strata would be permanently altered through caving and fracturing, however, this should not be visible from the land surface. Effects would be the same as Alternative B, but to a lesser degree and for a shorter period. There would be no subsidence under Deep Creek; therefore, no impacts to channel morphology or surface water would occur. The risk of affecting the channel morphology and flows of Deep Creek would be eliminated. Dry Fork Lease-By-Application FEIS S-7