Geopier GP3 ® Rammed Aggregate Pier ® Elements Ground Improvement PROJECT CHALLENGES The site had challenging subsurface conditions, including a 4- to 13-foot-thick layer of unsuitable granular fill underlain by a layer of soft peat and organic silt that was up to 10-feet-thick. Groundwater levels were encountered at depths ranging from 4 to 11 feet. Supporting the railroad section over the existing unimproved fill, peat, and orga

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