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• Ground Water Monitoring <br />Since 1979, Peabody (New Horizon Mine's predecessor) progressively installed an extensive <br />network of 35 wells to monitor the shallow aquifers beneath both the New Horizon 1 and the New <br />Horizon 2 mining areas. The current ground water monitoring plan employed to monitor the extent <br />and magnitude of any mining impacts is also discussed in Sections 2.04.7 and Section <br />2.05.6(3)(V}, Hydrologic Reclamation Plan. The ground water monitoring wells will be maintained <br />for the life of the mining operations or until such time as the CDMG may agree that they are no <br />longer necessary. All ground water monitoring installations will be removed upon completion of the <br />postmining hydrologic monitoring phase of the Hydrologic Monitoring Program. <br />All ground water data collected from monitoring wells in each future wateryearwill be compiled and <br />submitted to the CDMG in the form of the New Horizon Annual Hydrology Report (AHR). The <br />AHRs will be submitted within three months after the end of each water year. <br />Surface Water Protection <br />Section 2.05.3(3), Mine Facilities, contains descriptions, designs, and plans for a sediment pond, <br />roads, diversions, and culverts that will be constructed and utilized at New Horizon 2 mining area <br />• during mining. All facilities that are discussed in Section 2.05.3(3) have been designed to ensure <br />that the hydrologic balance is protected. <br />The discussion for surface water protection has been separated into three parts: 1) surface water <br />quality; 2) surface water quantity; and 3) surface water monitoring. <br />Surface Water Quality <br />-With the addition of Garvey and Burbridge properties for mining, the sediment pond (Pond 007) <br />will be enlarged during the proposed operations for controlling surface water runoff from disturbed <br />and reclaimed areas. The design of the pond has been developed to prevent additional <br />contributions of sediment to stream flow outside the permit area, to minimize erosion, and <br />incorporates detention times sufficient to ensure that all applicable efFluent standards will be met. <br />The pond discharge structures are designed according to standard engineering design procedures <br />for protecting against erosion via emplacement of riprap and/or energy dissipators. The pond will <br />be removed and reclaimed following the completion of mining and reclamation unless prior <br />approval to retain this impoundment is obtained. The 1999 amendment to add lands to the north <br />and west of the initial New Horizon 2 mine area resulted in the need for a number of new sediment <br />• ponds, which are shown in detail in the section on Mine Facilities. <br />REVISED MARCH 2006 2.05.6(3)-7 <br />