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• <br />4.05.6 Sedimentation Ponds <br />A small sedimentation pond will be constructed as close as practicable <br />to the area of Mt. Harris operations. The designed plans and <br />specifications for the sedimentation pond are presented in Section <br />2.05.6. <br />4.05.7 Discharoe Structures <br />The planned drainage and sediment control plan for the Mt. Harris Coal <br />Company is designed to prevent any discharges resulting from the <br />10-year, 24-hour precipitation event. Since no discharges will take <br />place, the requirements of this section are not applicable to Mt. <br />Harris. <br />4.05.8 Acid-Forming and Toxic-Forming Spoil <br />• No acid-forming or toxic-forming spoil material is found at the site. <br />4.05.9 Permanent and Temporary Impoundments <br />Because the post-operational land use will be for industrial purposes, <br />the embankment and sedimentation pond constructed at the Mt. Harris <br />facility will be left. The area is currently disturbed with coal <br />material; the embankment will ensure that no discharges can take place <br />either during or following operations. Details of this plan are set <br />forth in Section 2.05, Exhibit 7, Drainage and Sediment Control Plan, <br />and the Drainage and Sediment Control Plan (Map 7). Routine inspection, <br />during operation, of the embankment and sedimentation pond will be <br />conducted periodically as required. Maintenance procedures for the <br />embankment may include cutting of excess vegetation growth for the <br />purposes of facilitating inspections and repairs and will include <br />keeping the area free of debris. All combustible material other than <br />mulch or other material needed for erosion control will be kept from the <br />• berm embankment. <br />4.05-3 <br />