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GEOLOGY <br /> The on-site investigation conducted thus far has revealed <br /> the following subsurface features . A three to four foot <br /> interval of silty sand and sandy gravel lies beneath the <br /> asphalt surface . It seems likely that this interval consists <br /> of railroad bedding material covered by fill prior to paving . <br /> Undisturbed samples could not be collected due to the quantity <br /> and size of the gravel encountered. <br /> Below the sand and gravel is an extensive clay layer . <br /> Organic and silt components varied vertically throughout the <br /> clay. The clay was not punctured by the soil borings within <br /> which the second boring attained a maximum depth of 18 feet. <br /> The clay was fully penetrated during the installation of <br /> the monitoring well and both piezometers. The subjacent <br /> interval contained silts and very fine sands with a high <br /> percentage of silt and clay-sized particles. <br /> 3 <br />