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Doc Date:12/11/2001 -~ III IIIIIIIII IIII III <br />Section 816.47 Continued. <br />• <br />released from sedimentation ponds will travel through channels <br />lined with riprap, gravel, or natural vegetation before being <br />discharged into streams. Surge ponds at discharge points will not <br />be necessary to handle the low discharge rates expected from a <br />design event. Erosion downstream from the proposed sedimentation <br />ponds will be minimized by use of gravel dams and other sediment <br />filters placed in the stream channels where necessary. The place- <br />ment and use of these facilities will depend on local channel <br />geometry downstream from the discharge points of ponds and ditches. <br />The discharge structures described in this section will be in- <br />stalled where necessary after completion of the tributary ponds and <br />ditches and will be designed according to standard engineering <br />design procedures. <br />. ~~ 816.48 Hydrologic balance: Acid-forming and toxic-forming spoil <br />Drainage from acid-forming and toxic-forming spoil into ground and <br />surface water shall be avoided by-- <br />(a) Identifying, burying, and treating where necessary, spoil which, in <br />the judgment of the regulatory authority, may be detrimental to vegeta- <br />tion or may adversely affect water quality if not treated or buried; <br />(b) Preventing water from coming into contact with acid-forming and <br />toxic-forming spoil in accordance with Section 816.103, and other meas- <br />ures as required by the regulatory authority; and <br />(c) Burying or otherwise treating all acid-forming or toxic-forming <br />spoil within 30 days after it is first exposed on the mine site, or <br />within a lesser period required by the regulatory authority. Temporary <br />. storage of the spoil may be approved by the regulatory authority upon a <br />finding that burial or treatment within 30 days is not feasible and will <br />816-62 <br />