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EFCI will continue to add successive lifts until design refuse pile height <br />is achieved. In conjunction with the refuse pile expansion revision <br />submitted in 1989. EFCI opted to increase stockpile height to the maximum <br />design height of 75'. In order to provide a smooth transition between the <br />existing stockpile surface and future elevated areas, EFCI designed a <br />3H:1V slope up from the existing crest to the 75 foot level. Subsequent <br />reevaluation of refuse pile stability in 1992 resulted in a determination <br />that maximum stockpile height could be increased up to 80 feet. Upon <br />completion of coal refuse placement, the top surface and side slopes of <br />the refuse pile will be rough graded to provide for effective drainage <br />utilizing either a tracked dozer or motor grader. Refuse pile side slopes <br />will be established at a maximum gradient of approximately 3H:1V. The <br />upper surface of the refuse pile will be graded from west to east <br />establishing a minimum gradient of 0.5X to ensure drainage and prevent any <br />ponding of runoff on refuse materials. <br />In order to minimize total disturbance area and control erosion and <br />sedimentation, suitable cover/topsoil replacement and revegetation will <br />follow refuse placement as soon as operationally practical. A minimum of <br />4 feet of soil or other suitable material will be placed on regraded <br />portions of the refuse pile using tractor scrapers or a wheel loader and <br />trucks to move these materials from either topsoil removal areas or <br />existing stockpiles to replacement areas. <br />In conjunction with PR-O1, EFCI noted that topsoil availability is limited <br />due to historic site disturbance where topsoil was not recovered. Given <br />this limitation and a desire to use the available soil resources to best <br />advantage. EFCI completed physical and chemical analyses to evaluate the <br />suitability of refuse as a revegetation medium. The results of the <br />analyses, as summarized in Exhibit 9, Comparison of Refuse and Soil <br />Suitabilities, indicate that further testing to verify the suitability of <br />refuse materials may be justified. <br /> <br />REVTR75.REV <br />11/75/9311am 2.05.3.36R Revised - November 1993 <br />