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Wind and water erodibility are of primary concern when dealing with topsoil materials in this area. Several <br />soils have high silt, fine sand, and very fine sand levels in the upper portion of the profile, which, when <br />disturbed, are highly susceptible to wind and water erosion. Handling and grading destroys some of the <br />aggregate stability, further increasing erosion hazards. Because of these potential hazards, specific <br />protedive measures are required. Such measures will indude rapid establishment of vegetation, cover <br />cropping, and mulching, when necessary. Stabilization measures are described in more detail in Tab 22. <br />Stable postmine slopes wit! be designed to minimize sediment runoff and gullying. Postmine contours, <br />shown on 6diibit 20-2 and 20-2A. <br />• <br />• <br />28a Revised 7/02 <br />