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Page 14 FE 382- 063- 00 <br /> Because of theprobabil:ity of high differential settlements , the <br /> structures may be supported on deep foundations extending through <br /> the fill 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 piers . Drilled piers would not only require casing to <br /> support potential loose fill and voids , but also to allow <br /> inspection of the bearing statum. In addition, it is anticipated <br /> that dewatering may be required prior to placing concrete for <br /> piers . <br /> The differential movement of pier supported structures and <br /> the soil surrounding the piers is likely to result in a <br /> " downdraq " on the pier. The additional loads from the downdrag <br /> must be accounted for in the design of piers or 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 /> 7he Foundation Er*eers, Inc. <br />