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Page 14 FE 382-063-00 <br /> OBecause oL the probabiiity of high differential settlements , the <br /> structures may be supported on deep foundations extending through <br /> the f ill and into the underlying native material. Driven piles <br /> would cause ground vibration . The potential effects of this <br /> ground vibration would have to be checked as they relate to the <br /> nearby structures , railroad embankment and bridge. Furthermore , <br /> piles may • encounter very high resistance in miscellaneous fill <br /> prior to reaching its designed depths in natiVe materials.. We <br /> therefore suggest that the proposed structures be supported on <br /> drilled pie.rs. Drilled piers would not only requirecasing to <br /> support potential loose fill and voids , but also to allow <br /> inspection of the bearing statism. In addition, it is anticipated <br /> that dewatering may be required prior to placing concrete for <br /> piers . <br /> The d if f erential movement of pier supported structures and <br /> the soil surrounding the piers is likely to result in a <br /> "downdrag" on the pier. The additional loads from the downdrag <br /> <� must be accounted for in the design of piers o r be compensated <br /> for by extending the piers a distance of about, 20 feet into the <br /> native soils beneath the existing fill . It is suggested that <br /> entry ramps and utility connections be designed to accommodate <br /> the potential differential settlement between the pier supported <br /> structure and the surrounding ground. Finally, if the interior <br /> slabs are not structurally supported, some settlement may occur . <br /> Ilse Foundation Engninecra, Inc. <br />