The uppermost tens of meters beneath Earth’s surface has been studied for several decades by water specialists, soil scientists, ecologists, geologists, geotechnical engineers, environmentalists, and agricultural engineers. That portion of Earth both affects and is impacted by human activity such as building, excavating, tunneling, and storing or accidentally releasing hazardous materials.
Electrical Resistivity Tomography (ERT) is a cost effective, non-distractive geophysical technique that images variations in the electrical resistivity of the subsurface.
ERT technique is a 2D electrical imaging survey which is carried out using a large number of electrodes connected to a multi-core cable. In order to obtain a 2D electrical image as shown below, a horizontal and vertical data coverage is achieved by automatic sequential measurements of current and potential locations.
Afzelia provides the following services to its clients:
- Characterize subsurface geology and hydrogeology
- Borehole siting
- Delineate groundwater contamination and LNAPL plumes
- Determine depth to bedrock / overburden thickness
- Determine depth to bedrock and overburden interface
- Determine depth to groundwater
- Map salt water intrusion
- Map vertical extent of certain types of soil
- Map clay aquitards
- Estimate landfill thickness
- Characterize near surface water distribution and support hydropedology surveys