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n <br />LJ <br />• <br />• <br />vegetation if stockpiles will not be disturbed for six months or more. <br />In addition to these specific measures, any runoff from topsoil stockpiles <br />will be contained within the drainage and sediment control network for the <br />coal refuse stockpile. <br />Following topsoil removal, the foundation area will be ripped to alleviate <br />compaction and provide for an effective bond between surficial materials <br />and coal refuse. As indicated by the Hydrogeologic Map (Plate 2) included <br />in Section 2.04.7, Hydrology, of the EFCI permit application document <br />(Volume 2), the surficial material in the refuse pile expansion area is <br />essentially the same as foundation materials for the existing refuse pile. <br />surficial materials for the entire refuse pile area, including the <br />expansion area, consist of unconsolidated to moderately consolidated <br />sands, silts and conglomerates. Evaluation of the suitability of these <br />materials relative to foundation stability is discussed in Appendix 1, <br />Geotechnical Report. In addition, foundation stability has been proven <br />under actual operating conditions in the existing refuse pile. While <br />there may be minor localized variations in the characteristics of <br />surficial materials over the refuse pile area these should not <br />significantly effect pile stability as indicated by analysis results <br />comparing low and high strength foundation materials as discussed in <br />Appendix 1, Geotechnical Report. <br />7Ra Revised - February, 1990 <br />