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• <br />Reclamation: At the time that this site will be reclaimed, after mining ceases, the permit holder <br />will be required to recontour the site to the approximate original configuration. This will <br />generally involve flattening cut slopes and revegetation. Further, we assume that fills, <br />particularly those containing structures such as ttmnels and culverts, will be removed and used <br />to flatten cut slopes. It is our opinion that returning the site [o original grades will be successful <br />if the criteria for fill placement are followed. We do not recommend placing permanent, <br />reclaimed slopes at inclinations steeper than 2H:IV. The use of benches to controi slope <br />drainage and erosion and promote revegetation should be incorporated into the reclamation plan. <br />• FOUNDATIONS <br />A variety of structures are planned for this project. They include overland and tunnel <br />conveyors, storage silo, water tank, elec[rical substation, process, office, maintenance and <br />sewage treatment buildings. The following discussion is presented for planning purposes. R'e <br />recommend that, particularly where fills will be placed in structure areas, that a fmal <br />geotechnical engineering study be performed to more completely determine the fmal foundation <br />design criteria. <br />Most non-critical structures such as steel buildings can utilize spread footings, and drilled <br />piers can be considered for structures that cannot tolerate differential movements, or where <br />subsurface wetting is probable, due to surface drainage problems or wet processes in the <br />building, such as coal washing or sewage treatment. For very stiff to hard clays of low moisture <br /> <br />18 <br />