An environmental engineer with EA Engineering, Science, and Technology, Inc. works to identify more than 220 surface soil sampling sites during a remedial investigation into the presence of Per- and Polyfluoroalkyl substances at Truax Field in Madison, Wisconsin, March 22, 2022. The investigation marks the second major step in the Environmental Protection Agency’s Comprehensive Environmental Response, Compensation, and Liability Act process which will guide the mitigation of PFAS compounds on and around the Air National Guard installation. (U.S. Air National Guard photo by Senior Master Sgt. Paul Gorman)