2013-01-29_PERMIT FILE - C1981022A (3)

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Saver - 2.05.6 • Initiation of reclamation operations as soon as practical following completion of mining • • Effective reclamation to minimi~r gradienu, reestablish surface drainage patterns, restore pre-mining runoff and infiltration characteristics, and establish an effective and self- sustaining vegetative cover. • Post-reclamation land use management OMI has incorporated specific control and mitigation measures in mining, processing, and reclamation plans in order to prevent any significant irnpacu on surface or ground water quantity and quality. All mining related activities including soil/substirute removal, mine development, coal recovery, mine sealing, backfilling and grading, soil/substirute replacement, and revegetation are designed and sequenced to minimi~P disturbance and progress in a logical manner towards effective restoration of disturbed areas to a condition and configuration consistent with conditions which Brasted prior to mine development. The following sections discuss the details of the various components of the hydrologic protection plan. Components of Hydrologic Protettion Plans -The hydrologic protection plans outline specific measures Eor the Somerset, Sanborn Creek, and Elk Creek Mines that will be taken to: • Avoid acid or toxic drainage • Prevent additional contributions of suspended sohds to area drainages • Control runoff and erosion • Protect or replace affected water righu • Restore approximate pre-mining recharge capabilities • Specific prevention, control, and mitigation measures will include limiting the area of surface disturbance; construction, operation, and maintenance of an effective drainage and sediment control system; controlled collection, storage, use, and recycling of mine drainage; and effective reclamation of surface disturbance areas and restoration of surface drainage patterns. In addition to descriptions of specific hydrologic control and mitigation measures, compliance with specific applicable design standards and requiremenu are addressed, and potential adverse hydrologic consequences specific to the site are identified in the Probable Hydrologic Consequences (PHQ determination. Protection of Surface Water Quantity and Quality - OMI has incorporated specific control and mitigation measures in the proposed mitring, processing, and reclamation plans to effectively prevent or minimise significant mining-related impacts on surface water quantity and quality. Surface water systems will be protected by limiting surface disturbance; controlling surface runoff and erosion; handling earth materials, any ground water discharges, and runoff in a manner that minimises the fomration of acidic or toxic drainage, prevents additional contributions of suspended solids to streamflow outside of the permit area, and otherwise prevents pollution of surface water. As needed, surface water treatment facilities may ako be used to protett surface water. OMI's mining operations and related activities have the potential to effect surface water quantity through modification of surface runoff characteristics and increased sediment contributions from surface disturbance areas; consumptive rue of surface water for mining operations and support activities; any discharge of mine water to the surface system; and discharge of sediment and other potential pollutants from mining-related surface activities. Muting and related operations may also effect surface water quality by modifying surface water chemistry, altering pH, and increasing concentrations of TSS, TDS, and specific chemical corutiruenu. Specific activities which may . potentially impact surface water quantity and quality include the following: • Removal of vegetation and soil materials from disturbance areas • Realignment and culverting of portions of the Elk Creek channel PR04 2.05-78 Revered August 2000