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Mathews <br />Page 5 <br />November 13, 2000 <br />Please provide the latest survey information from which each of the revised SEDCAD runs for <br />Ponds 2-3,4, and SA are based on. This information will be used to verify current sediment <br />storage volume, current sediment level, and pond volumes. <br />Sa. As stated on Page IV-39 of the permit document, BME is currently required to maintain a <br />10-yeaz runoff storage volume in each of the Refuse Disposal Area ponds after a major storm <br />event. In order to maintain a 10-year runoff storage volume after a major storm event, the water <br />level in Pond RP-2/3 will be dewatered ] .6 feet, the water level in Pond RP-4 will be dewatered <br />2.0 feet, and the water in Pond RP-5 will be dewatered 1.65 feet below the primary spillway. <br />Please clarify how the 10-year runoff storage volume will be maintained if the sediment level is <br />raised in each of the Refuse Disposal Area ponds to within .5 feet of the primary spillway. <br />6. A C value of 0.9 is acceptable for the condition of the refuse piles. BME indicates that <br />crop management practices will be utilized for sediment determination. Pleasae clarify this and <br />provide a detailed description of crop management practices to be used at the Refuse Disposal <br />Areas. <br />