Study the geophysical response of infrastructure sites within the National Petroleum Reserve - Alaska (NPRA) that are threatened by erosion. The primary goal is to improve imaging of the subsurface by utilizing a portable broadband EM induction system to determine volumes of materials, resulting in the development of new procedures for data collection, processing, and inversion of the EM data. Enhance the state-of-the-art in near-surface imaging by utilizing new technologies for calibration and inversion. Use the results from the geophysical investigations to plan site characterization activities including: sample placement, trenching, excavation, and removal.