SAVANNAH, Ga. — Graham Johnston, a geologist with the U.S. Army Corps of Engineers Savannah District, preps a cone for use in the 20-ton CPT Push Platform, a piece of equipment that collects soil samples in subsurface environments. The U.S. Army Corps of Engineers Savannah District hosted 82 engineers, geologists, drillers, and other professionals from locations across USACE for the Joint Conference of the Geology and Geotechnical Communities of Practice, Aug. 14-16, 2012.