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tion, revegetation success monitoring will be conducted (refer to Section <br />• 2.05.6) to determine whether revegetation is successfully stabilizing the back- <br />filled mine area. <br />Backfilling and Grading - Reclaimed Mine Area <br />Sun Coal Company completed the approved reclamation plan including all <br />activities related to backfilling, grading, topsoil replacement, and revegeta- <br />tion. Prior to backfilling activities, Sun Coal Company instigated an acidic <br />and toxic forming material identification program (Table 2.05.3-10). The <br />program included sampling spoil materials on a 250-foot sampling grid, obtaining <br />samples in 2-foot increments to a depth of 6 feet, and analyzing for agronomic <br />inhibiting soil parameters. Parameters included: <br />pH <br />Particle size texture <br />• Soluble sodium <br />SAR <br />Acid base potential <br />Boron <br />Copper <br />Electric conductivity <br />Soluble magnesium <br />Soluble copper <br />Nitrate-Nitrogen <br />Selenium <br />Molybdenum <br />After sample results were obtained, Sun Coal Company, .with CMLRD con- <br />currence, determined no toxic or acid-forming materials were present to warrant <br />selective handling and/or burial. <br />Backfilling plans as previously discussed were developed from pre-mine base <br />maps (Map 15), disturbed mine area (Map 16), and the designed post-mine <br />topographic map (Map 17). The final "as-built" contour map completed by Sun Coal <br />Company is illustrated on Map 19. The goal of the grading program was to elimi- <br />nate high walls, spoii piles, and depressions. Activities were restricted to <br />using all available material within the disturbed permit area. <br /> <br />- 318 - <br />(Rev. 5/86) <br />