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Logs of borings from previous investigations in this area are included in Appendix C along <br />with the logs from borings drilled during the most recent investigation. <br />4.3 GROUND WATER <br />No ground water was encountered in the auger borings. This is consistent with vicinity <br />hydrogeologic studies which indicate the ground water table is well below the depth of our <br />exploration. Perched water was, however, encountered in the random fill. Based on the <br />knowledge of the site, some perched ground water is also expected in the lower till and outwash <br />layers. <br />5.0 RECOMMENDATIONS - NEW ADDITION <br />5.1 GENERAL <br />Foundations for the proposed expansion may be supported either on drilled piers (caissons) <br />or steel H-piles embedded into the natural glacial till or outwash soils. The letter is generally <br />prevailing in the north -antral area of the expansion where the revises existed prior to fill <br />placement. The approximate delineation of these materials are shown on Plate 7. The depths <br />from the existing ground surface to the top of the bearing stratum am shown on Plate g. <br />A combination of the two support methods may be used. Caisson/pile lengths of up to 140 <br />feet could be required. Downdrag forces on some of the caisson/piles will occur due to long term <br />settlements within the organic rich tone of the fill soils. The downdrag may preclude the we of <br />caissons in areas of organic rich soils. <br />The design parameters for caissons and pile foundation& are presented in the following <br />sections of this report. The following Bating shows some of the features associated with these <br />foundation. <br />■•005-00695.016\ssos0700.op <br />006"-509.016 6 <br />