SAVANNAH, Ga. — Graham Johnston (left), and John Markov (right), of the U.S. Army Corps of Engineers Savannah District monitor data collected by a 20-ton CPT Push Platform, a device used to collect soil samples in subsurface environments. e 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.