Pyramid Geophysical Services has performed a multitude of Underground Storage Tank (UST) investigations throughout North Carolina using geophysical methods. These metallic USTs are often left behind at old fuel service stations that have closed down. Old home heating oil tanks are also often left in the ground after … [Read more...]
Seismic (MASW) Surveys to Investigate Top of Rock
One of the most common applications of near-surface seismic testing is to identify the depth of the top of a bedrock unit in the subsurface. The two most effective seismic methods associated with this application are: 1) Seismic refraction, and 2) Multi-Channel Analysis of Surface Waves (MASW). Most people who are … [Read more...]
Slope Stability Analysis Using Geophysics
Pyramid Geophysical Services was contracted to assist in a comprehensive evaluation of subsurface geologic and hydrogeologic conditions along a causeway in South Carolina. The causeway was experiencing slope failures and ground collapses. These failures were thought to be the result of both the presence of buried … [Read more...]
Ground Penetrating Radar (GPR) Investigation of Shallow Bedrock
Ground penetrating radar (GPR) is an effective tool to rapidly image shallow bedrock under the right conditions. This project was conducted along a proposed pipeline alignment where geotechnical boring logs showed variable bedrock depth along the entirety of the alignment. The alignment consisted of a variety of ground … [Read more...]
Geophysical Ground Conductivity Mapping
The use of electromagnetic (EM) geophysical methods to evaluate ground conductivity variations is an effective tool to resolve environmental issues. However, the EM profiling instruments commonly used (such as the Geonics EM31 ground conductivity meter) for such applications provide depth-averaged conductivity values … [Read more...]
- 1
- 2
- 3
- 4
- Next Page »
