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- z o - <br />not exceeding 2 feet in loose thickness and compacted to at <br />least 90 % of maximum dry density as determined by the AASHTO <br />T-99 test method to insure adequate impermeability. <br />The thickness of the soil cover should be determined <br />after definitive classification of the waste rock material. <br />If the waste rock is ultimately classified as coal processing <br />waste, the thickness of cover should be 4 feet. However, if <br />the material can be classified as underground development <br />waste, the thickness of soil cover need only be adequate for <br />proper revegetation. <br />Topsoil should be used to assist in revegetation. <br />1 <br /> <br /> <br />1 <br /> <br />1 <br />1 <br /> <br />4.7 INSPECTION AND CERTIFICATION <br />Inspections by a suitably qualified registered pro- <br />fessional engineer will be required during important stages <br />of the site preparation and construction of the pile. The <br />engineer should ensure that all construction recommendations <br />are complied with and inspect the pile for any potential <br />ha2ards or instability. He should prepare a written report <br />subsequent to each inspection and submit it to the mine <br />management and all appropriate regulatory agencies. <br />We recommend that inspections be made at the following <br />critical times: <br />o Subsequent to topsoil removal and foundation <br />preparation. <br />o At three month invervals during construction of <br />the pile. <br />o After final grading of the pile surface. <br />o After final covering in preparation for revegetation. <br />~coNrooo coHSmnnc, iNC. <br />