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Stockpiles are specifically located to avoid erosion from wind and water and additional compaction or contamination. As can be determined from the Topsoil Handling Map (Map 28), all proposed stockpiles are located within stable areas. The piles will be protected from wind erosion by planting a perennial mixture as explained in Section 4.06.3 as soon as conditions allow. Proper seasons of planting will be early spring or late fall. In addition to the planted material, a considerable amount of volunteer growth can be expected to grow on all stockpiled topsoil. External erosion will be controlled through proper location of the stockpiles. No permanent topsoil stockpiles will be placed in a drainage bottom where external erosion might pose a potential threat. Unnecessary compaction will be avoided by keeping all but essential traffic off the stockpiled areas. Topsoil signs will identify topsoil stockpiles. Contamination of the stockpiles will be eliminated by the careful selection of sites that are distant from the areas where actual mining activities are occurring. Drainage ways and areas near spoiling and blasting will be avoided where possible. Overburden and Coal The complete description of the removal, handling and storage of all overburden material within the permit area is described under the Production, Methods and Equipment Section found at the beginning of Section 2.05.3. The mining sequence for the planned operation is shown on the Mine Plan Map (Map 23). Cross sections showing the mining operation during the "steady-state" operation are found on the Mining Range Diagram (Map 24). The planned coal production at the Colowyo operation is shown in Table 3, Historic and Anticipated Annual Coal Production. Colowyo usually engages in blasting of overburden and coal before its removal. A general sequence for drilling and blasting of overburden and coal will proceed as follows: ~~~~I V ~~ 2.05-27 DEC 1 0 1991 C Mined Land ova( '~~rhmofin,l I7i~dr,nn