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All surface mine operations will be conducted to achieve the effluent limitations of 4.05.27(7) <br /> for all mixed drainage when it leaves the permit area. <br /> Sedimentation ponds or impoundments will be constructed before creating new disturbances, <br /> unless approved drainage diversions or other surface water control structures are installed. <br /> Diversion Ditches <br /> The diversion ditches or collection drains in the permit area are the following: <br /> Temporary Ditch <br /> 002 Ditch <br /> 004 Ditch <br /> 005 Ditch <br /> County Road Ditch <br /> Permanent Ditches <br /> Area 1 - (1) Ditch <br /> Area 1 - (2) Ditch <br /> Area 1 - (3) Ditch <br /> Area 1 - (4) Ditch <br /> These ditches are used to transport runoff into sedimentation ponds for treatment in <br /> accordance with the requirements of applicable regulations. Table 13-4 summarized <br /> specification of these ditches. Ditch designs (SEDCAD) are included in Attachment N. The <br /> location of each ditch can be found on Exhibits 13-4. <br /> Each ditch was designed and constructed in accordance with the applicable regulations in <br /> 4.05.3. Diversions were designed, constructed and maintained in a manner which prevents <br /> additional contributions of suspended solids to steam flow and to runoff outside the permit <br /> area. Appropriate sediment control measures for these diversions may include maintenance <br /> of appropriate gradients, channel lining, revegetation roughness structures, and detention <br /> 13-3 Revised 10/22/93 <br />