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• TCC will examine the ponds quarterly and complete maintenance of <br />the structure to ensure that it fulfills its intended use. <br />Discharge Structures <br />Discharge from the sedimentation pond will be controlled by the use <br />of a principle spillway with a gate valve. An emergency spillway <br />will also be constructed on the sedimentation pond. The water <br />released from the pond will travel through the spillway which will <br />be lined with riprap, gravel or natural vegetation before being <br />discharged into the natural drainage. Discharge from the dugout <br />ponds will be through a combination, open channel, emergency and <br />principle spillway. <br />Permanent and Temporary Impoundments <br />No permanent impoundments are planned at TCC loadout facilities. <br />The sedimentation pond and dugout pond will be the only temporary <br />impoundments for use during operations and will be maintained in a <br />safe condition to ensure that it serves its intended purpose. <br />• Maintenance procedures for the ponds may include mowing and cutting <br />any excess vegetation growth for the purpose of facilitating <br />inspections. Repair will include keeping ditches, culverts, <br />spillways and other outflow structures free of debris. All <br />combustible material other than mulch or other material needed for <br />erosion control and surface stability will be removed. <br />u <br />0 <br />Surface Water Monitoring <br />The surface water monitoring plan includes monitoring required <br />under an NPDES permit issued by the Colorado Department of Health. <br />Surface water samples will typically be analyzed for pH (s. u.), <br />Settleable Solids (ml/1), Total Dissolved Solids (mg/1) and Oil and <br />2.05 - 24R <br />Rev. 10-30-92 <br />