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• <br />GENERAL DESCRIPTION <br />This section of the Drainage and Sediment Control Plan addresses <br />existing drainage and sediment control structures. Design information <br />for these structures was submitted in the original Kerr Application in <br />1980. Designs for these structures have been approved, and the <br />structures have been constructed, and currently exist at the Kerr Mine. <br />The existing structures are as follows: <br />- Sedimentation Ponds - A, B, C, D, E, F, G <br />- Diversion Ditches - A1, A2, B1, B2, C1, D1, F1, G1 <br />- Cu]verts - 1, 2, 3, 4, 5, 6, 7, 8, 9 <br />A number of these structures were constructed prior to promulgation of <br />the Surface Mining Control and Reclamation Act of 1977 and the <br />subsequent Colorado regulatory program. The affected structures were <br />• modified or reconstructed during 1979-1980 to effect compliance with <br />applicable regulations. <br />The original certified drawings reflecting current pond configurations. <br />Sedimentation Ponds Kerr Coal Mine (Plate I), and Sedimentation Ponds - <br />Hydrology and Hydraulics (Plate II), have been included without revision <br />in this revised exhibit. The following structures have been redesigned <br />to reflect changes in the mining and reclamation plans and should be <br />disregarded on these drawings: <br />- Sedimentation Ponds - H, I, J, K, L, M, N <br />- Diversion Ditches - H1, I1, I2, I3, K1. M1, N1, N2, I4 <br />• <br />Design Methodology, assumptions, parameters, and calculations for the <br />existing structures are based upon applicable regulations at the time of <br />approval. As a consequence, same of this infonnatlon may not be <br />consistent with current regulatory guidelines. <br />23-4 <br />