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• All ground water monitoring installations will be removed upon completion of the postmining <br />hydrologic monitoring phase of the Hydrologic Monitoring Program. <br />All ground water data collected from monitoring wells in each future water yearwill be compiled and <br />submitted to the CDMG in the form of the New Horizon Annual Hydrology Report (AHR). The AHRs <br />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) will <br />be enlarged during the proposed operations for controlling surface water runoff from disturbed and <br />reclaimed areas. The design of the pond has been developed to prevent additional contributions <br />of sediment to stream flow outside the permit area, to minimize erosion, and incorporates detention <br />times sufficient to ensure that all applicable effluent standards will be met. The pond discharge <br />structures are designed according to standard engineering design procedures for protecting against <br />erosion via emplacement of riprap and/or energy dissipators. The pond will be removed and <br />reclaimed following the completion of mining and reclamation unless prior approval to retain this <br />impoundment is obtained. The 1999 amendment to add lands to the north and west of the initial <br />New Horizon 2 mine area resulted in the need far a number of new sediment ponds, which are <br />shown in detail in the section on Mine Facilities. <br />The impact of a sediment pond and runoff from reclaimed areas on the quality of receiving streams <br />was found to be of minimal significance (see Probable Hydrologic Consequences at the end of this <br />section). Existing NPDES permit (CO-0000213) has been modified to include 007. All terms and <br />agreements specified in the approved permit will be adhered to during the mining operation to <br />ensure that effluent will meet the permit limitations. Based on past water quality monitoring, it is <br />anticipated that no treatment of pond effluent is necessary. However, should the need for treatment <br />• (REVISED 6/01) 2.05.6(3) - 5 <br />