2011-03-21_PERMIT FILE - C2009087A (2)

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RULE 2 - PERMITS . and for a short period of time following diversion of flows until the surface stabilization is achieved All proposed culverts are located along existing or proposed ephemeral ditches; none are located in flowing streams. PSCM will effectively minimize the impacts to stream flows and sedimentation by scheduling culvert placement, removal, and post- mining stream channel restoration during dry weather, if feasible; utilizing silt fences to minimize potential sediment contributions both during and following construction; extensive use of riprap and other erosion control materials in both the channel and adjacent bank areas; and, revegetating all construction disturbance areas. There are negligible potential mining- related impacts on water rights and use in Little Grassy Creek. SCCC holds sufficient water rights within the Grassy Creek basin to offset any decreases. Excess mine drainage not used for underground operations, which does not result in any reduction in surface flows due to the lack of a direct hydraulic connection, will probably result in some variable discharge of excess mine water to the surface system, effectively augmenting surface flows on a year -round basis. SCCC is committed to mitigate any significant adverse impacts to offsite water rights through augmentation of any affected water rights, development of alternative watering facilities, or other appropriate mitigation measures. Potential Acid- or Toxic - Producing Materials and Drainage - Comprehensive discussions of the chemical characteristics of coal and other materials to be disturbed or handled in conjunction with mining and related activities are presented in Section 2.04.6, Geology Description. Evaluation of all available chemical analyses has resulted in no indications that the sampled materials are or will be potentially acid- or toxic - forming. In addition, ongoing experience with mining the Wadge Coal • seam at the Seneca II, Foidel, and Yoast mine sites indicates there is no significant potential for development of acidic or toxic drainage as a result of any mine water discharge or resaturation following mine abandonment and sealing. While underground mining may result in shifts in surface and ground water chemistry and changes in TDS levels and concentrations of specific chemical components discussed above, these changes in water quality will be localized and are not expected to result in any significant adverse impacts on surface or ground water systems or the planned postmining land use. Given these considerations, no special measures are necessary to control or mitigate potential impacts from acid - or toxic - forming materials. However, mine drainage control, controlled placement and off -site disposal of non -coal wastes, and sealing of mine openings will certainly serve to minimize any potential minor impacts. Potential for Interruption, Diminution, or Contamination of Water Supply Sources - As previously discussed., PSCM's mining and related operations are not expected to adversely impact any surface or ground water sources or water rights. Consequently, there is no need to explicitly address provisions for replacement of impacted water rights at this time. In the unlikely event however, that proximate contamination, diminution, or interruption does occur and can be documented as resulting from their existing or proposed mining and related operations, PSCM will mitigate the associated water rights impacts through discussion and development of a cooperative agreement with any affected water rights holder(s). Potential mitigation options may include but will not be limited to replacement or augmentation of affected water rights or development of • alternative watering facilities. PSCM controls several senior water rights in the area which should be more than sufficient to mitigate any impacts on beneficial water use resulting from potential mining - related impacts to the hydrologic balance. PSCM Permit App. 2.05 -91 Revision 03/05/10