Rock Trenching The Right Way | Underground Construction
An unexpected complication was an underground void encountered while digging 14-foot-deep trench. Collapsing soil created a 15 by 15-foot sink hole. "We had to relocate 500 feet from that
Sub-bottom Profiling | Ground Penetrating Radar System
For freshwater sub-bottom profiling, a ground penetrating radar system can also be used. Marine seismic refraction is used to map geologic strata and to obtain compressional wave velocities