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• Access to the mine property is controlled. Therefore, unauthorized persons are not likely to have access <br />to the pit area. The area will not be leased for grazing, thus stock will not be endangered by the open <br />pits. Sedimentation ponds in llte and Johnson Gulch will be maintained during the temporary <br />abandonment as a safeguard against the contribution of suspended solids to area streams. A seed <br />mbdure of alfalfa, intermediate wheatgress and pubescent wheatgress was seeded on the reconloured <br />spoils and prestrip area to aid in erosion control. Additionally, contour dttches and other appropriate <br />erosion control structures and practices approved wtthin this permit application are used as needed to <br />control surface runoff. <br />If for some unforeseeable reason tt becomes necessary to abandon an area, the final highwall and pit will <br />be eliminated in accordance wtth applicable regulations. Portions of each of the last three spoil rows and <br />overburden material from the pits highwall would be used to backfill the pit (refer to Figure 3.52). Gre- <br />dients and sideslopes would be similar to pre-mining drainageway gradients and sldeslopes for the <br />general area. Depending upon equipment availability and economics, dreglines, trucks, shovels, back- <br />hoes, scrapers or conveyors woukt be used to move the material. Amore detailed plan for the specific <br />ptt closure and elimination of the sper~c final highwall will be submitted within 80 days of becoming <br />aware of the need for abandonment. <br />3.5.8 Covering Coal and Acid or Toxic Forming Material <br />• The only waste needing special attention is natural pre-existing coal wastes. These coal wastes occur <br />from coal croplines, oxidized or burned areas, and seams that are too thin to economically mine. When <br />coal of this nature is encountered, the dregline operators cast the wasted coal into the spoil piles in such <br />a manner to ensure the coal is adequately covered with overburden material. <br />It is not anticipated that any coal stockpiles will be abandoned during the penntt period. However, if such <br />action should become necessary, the coal that is not of sufficient quality to deliver per contractual <br />agreemerts will be hauled <br />• .:.-..PR.-~ -- -- <br />3-48 ....;; ~ _ . <br />-- may 13 i99a <br />