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Section 816.46 (u) Continued. <br />after the termination of mining activities, but not until the <br />disturbed areas has been restored and the vegetation requirements <br />of 30 CFR 816.111-816.117 are met (See the discussion under each <br />Section) and the drainage entering the pond is approximately equal <br />to the quality of the receiving stream before the initiation of <br />any mining activity, as established by baseline water quality data. <br />Upon removal of each sedimentation pond, the affected land will be <br />regraded and revegetated as required by 30 CFR 816.100-816.106 and <br />Sections 816.111-816.117 and as described in detail under Section <br />780.18 <br />Section 816.47 Hydrologic balance: Discharge structures. <br />Discharge from sedimentation ponds, permanent and temporary impound- <br />ments, coal processing waste dams and embankments, and diversions shall <br />be controlled, by energy dissipators, riprap channels, and other devices, <br />where necessary, to reduce erosion, to prevent deepening or enlargement <br />of stream channels, and to minimize disturbance of the hydrologic balance. <br />Discharge structures will be designed according to standard engineering- <br />design procedures. <br />Discharge from surface water facilities will be controlled by the <br />use of energy dissipating and flow check devices where necessary. <br />Water released from sedimentation ponds will travel through spillways <br />lined with riprap, gravel or natural vegetation before being dis- <br />charged into streams. Surge ponds at discharge points will not be <br />necessary to handle the low discharge rates to be expected from the <br />design event. Erosion downstream from the proposed sedimentation <br />ponds will be minimized by use of grave]. dims and other sediment <br />filters placed. in the intermittent streams and perennial streams, <br />as shown on the Fckman Park Hydrology (Map 14) and the Energy Mines <br />No. 1 and 2 Y,ydrology (Map 13). Additional discussion and designs <br />for discharge structures are presented in Exhibit 13, Sedimentation <br />Ponds - Hydrologic Investigations, Figure 32, Permanent Diversion <br />Structures, and Table 100, Temporary Diversion Structure Specifications. <br />Exhibit 8p 816-49 12/13/99 <br />