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• 4. SEDIMENT PONDS <br />A. NPDES 4uarterly Reports <br />All sediment pond discharges were sampled and monitoring <br />data was reported to the appropriate State and Federal <br />agencies. Copies of the quarterly monitoring reports are <br />found in Exhibit 6. <br />B. Ouarter_y Inspections <br />The quarterly inspection reports are found in Exhibit 7. <br />All the inspection reports indicate there are no problems <br />with any pond. <br />C. sediment survey <br />During 1991 detailed topographic surveys of all sediment <br />ponds were performed by an independent surveying company. <br />The results of the surveys indicate that all ponds, both <br />at the minesite and at the loadout, have adequate <br />sediment storage capacity available. <br />During 1991, TR-60 to Modify Sediment Control Structures, <br />was approved by CMLRD. The SEDCAD sizing for Explosives <br />• Storage Point 001, Landfill Point 002, and Shop/Office <br />Point 003, showed that both the runoff volume and the <br />sidement delivered to each pond is zero. Therefore, <br />adequate sediment storage for these three ponds is <br />guaranteed. <br />A volumetric summary for sediment volumes in each pond <br />follows: <br />• <br />4 <br />