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Appendix A Revised 12/21/82 <br /> <br />Maintenance Program <br />Maintenance of sedimentation ponds and .diversion ditches will be <br />required during the intended life of the structures. Sediment shall be <br />removed from the ponds when it has accumulated to sixty percent (60%) of <br />the designed sediment storage volume. The sixty percent sediment level <br />is indicated~on the riser pipe of each pond in order to ensure that <br />sediment is removed before it accumulates past that level. Sediment in <br />pond H will be removed on a more regular basis to ensure that it will <br />not accumulate to the gated spillway which is required for the Bourg <br />Mine augmentation plan. In accordance with Rule 4.05.6(11) of the <br />CMLRB, pond embankments should be inspected a minimum of four (4) times <br />per year by the mine operator for structural weakness or erosion, and repairs <br />made when necessary. Rills and gullies deeper than nine inches (9") <br />which develop on an embankment should be filled and revegetated. Operating <br />• spillways may need to be periodically cleaned and repaired to ensure <br />that they operate as designed. Ditches should be maintained at the <br />designed gradients and revegetated when necessary. Vegetative growth <br />on embankments may need to be periodically cut to facilitate inspection <br />and repairs. <br /> <br />