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SLOPE RECONSTRUCTION BY BACKFILLING Page 3 <br /> Only one area along the south side of the South Area will need any <br /> significant amount of backfilling to create the final slope. All other slopes <br /> are either in native material or graded as part of adjacent reclamation. <br /> This backfill area is divided into three parts. <br /> 1. 755'of 55' high slope along south side east of sediment basin. <br /> 2. 934'of slope that descends from 55'to about 10' high along south edge <br /> of Little Johnson mining area. <br /> 3. 1255'of 25' high slope around south &southeast side of sediment basin. <br /> Slope portions <br /> Uniform Descending Short slope <br /> Parameter height height above sed basin <br /> Length of slope (ft) 755 934 1255 <br /> Mean height of slope (ft) 55 32.5 25 <br /> Initial slope grade (n:1) 1.25 1.25 1.25 <br /> Final slope grade (n:1) 3 3 3 <br /> Initial slope width 68.75 40.625 31.25 <br /> Final slope width 165 97.5 75 <br /> Initial cross-section area 1890.625 660.15625 390.625 <br /> Final cross-section area 4537.5 1584.375 937.5 <br /> Area difference (sq ft) 2646.875 924.21875 546.875 <br /> Volume needed (cu yd) 74,014 31,971 25,420 <br /> Est. cost/cu yd $1.00 $1.00 $1.00 <br /> Est cost for backfilling $74,014.47 $31,971.12 $25,419.56 <br /> TOTAL ESTIMATED COST FOR SLOPE RECONSTRUCTION = $131,405.15 <br />