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This U.S. Geological Survey (USGS) Data Release contains tree-core, groundwater, and soil data collected at the Vienna Wells Superfund site in Vienna, Missouri by the U.S. Geological Survey between 2011 and 2016. Concentrations of tetrachloroethylene (PCE), trichloroethylene (TCE), and 1,1,2-Trichloro-1,2,2-trifluoroethane (CFC-113) are reported for each location or sample in each medium. Tree-core sampling was conducted over seven days during six major phases occurring during September 2011, May 2013, August 2013, July 2014, May 2015, and October 2015. A total of 470 tree-core samples were collected and analyzed using established methods. A total of 56 groundwater samples were collected from monitoring wells on...