Aug. 11, 2021, Update on NIST’s Champlain Towers South Investigation
 NIST continues its investigative work, studying the geologic characteristics underneath the collapsed building site, as well as the properties of the building’s foundation system. The subsurface investigation includes standardized procedures for monitoring the groundwater, as well as field and laboratory testing of the soil and rock. Field testing will seek to shed light on how the subsurface soil layers vary in depth below the building and across the building’s footprint. This will include performing standard penetration testing to reveal the stiffness of different layers of soil and creating small-diameter (5-centimeter, or 2-inch) boreholes to collect soil samples that can be used for determining the general characteristics and type (e.g., sand, clay, rock) of soil deposits, the general soil classification, the size of the grains within the soil mass, and soil strength characteristics.
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