Fresh impacts of NAPL materials (fuels, solvents, etc.) present as subsurface resistive anomalous zones as they slow electrical current moving through those areas. Weathered impacts affected by microbial activity become highly electrically conductive due to the films and colony structure of microbes. To highlight the features of interest, Aestus will generates color scales to emphasize anomalous conductive or resistive zones based on historical and/or confirmation drilling data, which identify levels of resistivity of concern for the biogeochemistry of the particular site relative to cleanup goals. Below LNAPL site example has the same final dataset color contoured two different ways