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CHRONOLOGICAL HISTORY OF REVEGETATION <br />No areas were revegetated in 2011 at the Seneca II Mine. <br />SEDIMENTATION POND SURVEYS <br />SCC is required by Permit C -80 -005 to monitor sedimentation ponds for sediment storage <br />capacities on varying schedules. Per page 7 -333 in the PAP, capacity survey at Pond 008 is <br />required 2 years. Since pond 008 was surveyed in 2010 it will not be resurveyed until 2012. <br />This schedule provides a sediment yield history and gives advance warning to operations <br />personnel when sediment clean-out work is required. <br />In accordance with Rule 4.05.6(11)(c), SCC visually inspects the pond a minimum of quarterly <br />each year. During these inspections, any drastic change in sedimentation storage or sudden <br />increase in a sediment delta at the inlet to the pond would be detected which could require <br />mitigation. <br />Based on the 2006, 2008 and 2010 surveys, the sediment pond has sufficient sediment storage. <br />Additionally, the pond has been discharging in compliance with the approved NPDES permit <br />effluent limitations. Yearly sediment delivery estimates to the pond is considerably less than <br />originally calculated, since the areas in the watersheds have now been reclaimed and revegetated. <br />Table 11.1, Sediment Pond Capacity lists the 2006, 2008 and 2010 surveyed capacities of <br />sediment pond 008: <br />From the past history of sediment delivery to all of these ponds there is adequate sediment <br />storage capacity available. These ponds were approved as permanent. <br />STOCK TANKS <br />There are no stock tanks in the Seneca II mined/reclaimed. No new stock tanks were constructed <br />during the 2011 season. <br />LITERATURE CITED <br />2008 Annual Reclamation Report, Seneca II Mine, Routt County, Colorado. Submitted to the <br />Division of Reclamation, Mining and Safety in March 2008 by Seneca Coal Company, <br />Hayden, Colorado. <br />Seneca II Mine. Permit Application Package, Permit No.0 -80 -005 <br />2009 Annual Reclamation Report, Seneca II Mine, Routt County, Colorado. Submitted to the <br />Division of Reclamation, Mining and Safety in March 2009 by Seneca Coal Company, <br />Hayden, Colorado. <br />Seneca II Mine. Permit Application Package, Permit No.0 -80 -005 <br />3 <br />