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• <br />of accumulated sediment. A Universal recording precipitation gage, <br />installed in February, 1977 will be operated on a continuing basis to <br />rnonitcr rainfall. The spillway of the lowermost pond will be equipped <br />with a stilling well and water level recorder to monitor ary overflows <br />should they occur. <br />It is proposed that after mining has ceased, that the retention <br />• <br />ponds remain in place to form a series of drops in this reach of channel. <br />The channel trould be reinforced ~•rith heavy riprap where necessary to <br />prevent scouring of hod and banks. It is believed that the stream will <br />have begun to adjust itself to a new flow regime by the time mining <br />activities are terminated. Additional disturbance by removal of the <br />structures would again disrupt the flow regime causing increases in <br />sedimentation and changes in channel morphology. <br />The waste disposal area will be located immediately downstream from <br />the TLS Bench as shown in Figure 3. This area will contain mine spoils <br />and stockpiled top soil. P1ine refuse and topsoil embankments ~•rill be <br />engineered, constructed, and reclaimed in accordance with ~?ESA specifica- <br />tions (see Leaf, 1977-Appendix III). All surface runoff from these <br />embankments will be routed through the sediment retention ponds. The <br />ponds will be cleaned as needed to ensure adequate storage capacity. <br />Sediment removed from these ponds will be trucked back to the waste dis- <br />posal area, and used in mine-reclamation activities. The configuration <br />of spoils placement during phase I will be approximately as shown in <br />Figure 4-1 "Starter Embankment." <br />• <br />