Geophysical Mapping: Problem Details 5 of 39 Problem Name: Contaminant plumes Problem Type: Hazardous Waste Assigned Methods: + DC geoelectrics - Profiling Electrical Methods + Electrical and induction logging Borehole Methods + Fluid logging, Flow meter Borehole Methods + Frequency-domain electromagnetics - Profiling Electromagnetic Methods + Frequency-domain electromagnetics - Sounding Electromagnetic Methods + Geoelectrics - Crosshole tomography Electrical Methods + Geoelectrics - Tomography (surface based) Electrical Methods + Ground penetrating radar (surface-based) Electromagnetic Methods + Ground penetrating radar - Borehole tomography Electromagnetic Methods + Induced polarization - Tomography (surface-based) Electrical Methods + VLF / VLF-R, Radiomagnetotellurics Electromagnetic Methods 0 Borehole imaging, Structure logging Borehole Methods 0 Induced polarization - Profiling Electrical Methods 0 Induced polarization - Sounding Electrical Methods 0 Time-domain electromagnetics - Profiling Electromagnetic Methods 0 Time-domain electromagnetics - Sounding Electromagnetic Methods    '+' = Technique applicable; '0' = Application possible/limited use