Geophysical Mapping: Problem Details Problem Name: Monitoring Problem Type: Hazardous Waste Assigned 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 + Ground spectrometry Radioactivity + Self potential Electrical Methods + VLF / VLF-R, Radiomagnetotellurics Electromagnetic Methods 0 DC geoelectrics - Profiling Electrical Methods 0 Refraction seismic tomography (surface-based) Seismic Techniques 0 Seismic crosshole tomography Seismic Techniques    '+' = Technique applicable; '0' = Application possible/limited use