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• this time, this is an adequate amount of sediment storage; therefore, no remedial sediment <br />clean-out work is scheduled during the next year. <br />At this time, no sediment clean-out work is scheduled for the sedimentation ponds at the <br />Seneca II Mine. Peabody Coal Company requests a variance from the requirement to conduct <br />annual sediment surveys of these sedimentation ponds. Based upon the above survey data <br />and calculations, the following sediment survey schedule will be implemented: <br />Sedimentation Pond <br />002 <br />003 <br />004 <br />007 <br />008 <br />Frequency <br />Once every 5 years <br />Once every 5 years <br />Once every 2 years <br />N/A <br />Once every 2 years <br />Next Scheduled Surve <br />1992 <br />1992 <br />1989 <br />N/A <br />1989 <br />This schedule would continue to develop a sediment yield history and also allow advance <br />• warning to operations personnel when sediment clean-out work is required. In accordance <br />with Rule 4.05.6(11)(c), Peabody visually inspects each pond a minimum of quarterly each <br />year. During these inspections, any drastic change in sediment storage or sudden <br />increases in a sediment delta at the inlet to the pond could be detected which would <br />require mitigatory action. <br />• <br />7-11A-10 <br />