The Oak Ridge Integrated Field Research Challenge (ORIFRC) project is funded by the U.S. Department of Energy’s (DOE’s) Subsurface Biogeochemical Research (SBR) Program in order to study the various biogeochemical processes involved in the remediation as well as natural attenuation of a large contaminant plume that is extant in the vicinity of the former S-3disposal pond area in Oak Ridge, TN. A part of this work has been to characterize the movement of this groundwater/contaminant plume with the use of seismic first-arrival tomography (SFT).