Geophysical Mapping: Problem Details Problem Name: Quantity/ Thickness Problem Type: Hazardous Waste Assigned Methods: + DC geoelectrics - Sounding Electrical Methods + Geoelectrics - Tomography (surface based) Electrical Methods + Induced polarization - Sounding Electrical Methods + Refraction seismic tomography (surface-based) Seismic Techniques + Seismic surface waves methods Seismic Techniques + Standard refraction seismics Seismic Techniques 0 DC geoelectrics - Profiling Electrical Methods 0 Geoelectrics - Crosshole tomography Electrical Methods 0 Ground penetrating radar (surface-based) Electromagnetic Methods 0 Ground penetrating radar - Borehole tomography Electromagnetic Methods 0 Seismic crosshole tomography Seismic Techniques 0 Time-domain electromagnetics - Profiling Electromagnetic Methods 0 Time-domain electromagnetics - Sounding Electromagnetic Methods 0 VLF / VLF-R, Radiomagnetotellurics Electromagnetic Methods 0 Vertical seismic profiling (VSP) Seismic Techniques 0 Very-high resolution reflection seismics Seismic Techniques    '+' = Technique applicable; '0' = Application possible/limited use