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Bac kfillinq and Grading <br />The first major phase in the reclamation of disturbed land is backfilling and <br />grading the cut and fill areas. This Process is also discussed in the <br />Bac kfillinq and Grading Plan found in Tab 18. <br />The first step is the determination of volumes. Cross sections were developed <br />in the rail spur area with the aid of a computer program from SoftDesk (see <br />Exhibit 18-2). Postmine slopes were then superimposed on the diagrams. For the <br />sake of continuity, it was estimated that all material would be graded toward <br />the railroad cut at slopes between 5H:1V and 10H:1V when sufficient adjacent <br />land was available. A digitizer was used to balance the cut and fill volumes of <br />material needed to create the above-described topography. This produced a final <br />topography that could not only be revegetated, but would also allow drainage to <br />flow through the reclaimed area without impounding water. <br />The CDMG utilized the CIRCES Cost Estimation Software to determine dozer <br />production. The program utilizes information given in the Caterpillar Handbook. <br />All tables and charts are computerized to simulate production for track type <br />equipment. See the various worksheets in Attachment 23-1 for production and <br />costs. <br />It is not anticipated that wheel type earthmovers will be needed to backfill the <br />cut areas. Sufficient material exists adjacent to the cut areas for backfill <br />purposes. <br />Topsoil Replacement. Topsoil replacement volumes were based on the volume of <br />material in stockpiles as determined by the soil survey. The CIRCES Cost <br />Estimation Software was used to estimate scraper production. Attachment 23-1 <br />includes scraper product and cost worksheets. <br />Topsoiling was broken down into two tasks: 1) Topsoiling the approximately 9,200 <br />feet of spur track, north of the loop area (costs were also included for support <br />equipment and a D10N dozer was used to push the topsoil off the side slopes for <br />later distribution); 2) topsoiling the remaining loop track area and facilities <br />areas including Haul Road HGLF-HR2. <br />TR-07 2 Revised 03/06 <br />