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ARM Geophysics
1129 West Governor Road
P.O. Box 797
Hershey, PA 17033-0797

Scott Wendling, PG
Phone: 717-508-0583
[email protected]

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EM-31 Terrain Conductivity Surveys
High Resolution Geophysical Technologies

ARM Geophysics performs Terrain Conductivity Surveys for a variety of applications. To perform Terrain Conductivity Surveys, ARM uses a Geonics EM-31DL conductivity meter. For environmental applications the EM-31 data can be used to map landfills, buried drums, and shallow groundwater contamination. It also has geotechnical applications such as soil thickness and possible sinkhole or pinnacle locations in karst terrain.

Where possible, ARM integrates the data collection with Global Positioning Systems (GPS) with at least sub-meter accuracy. Depending on how the data are collected, the effective depth of the system is approximately 7.5 or 18 feet. The system is a non-intrusive conductivity measuring device, and data can be collected almost as fast as the operator can walk. The system provides two measurements, Quadrature (apparent conductivity) and In-phase data (metallic response). The data are digitally recorded and periodically down-loaded to a field computer for quality assurance and preliminary interpretation.

At the conclusion of a survey, the EM-31 data are interpreted and mapped as shown in the example. The EM-31 data are contoured, and presented in a fashion that will show the interpreted subsurface features (ie; areas of concern).




 

An EM-31 survey, which measures the apparent conductivity of the subsurface, can be used to estimate the relative amounts of soil and rock within the area of measurement. Higher apparent conductivities measurements imply a thicker soil cover, while lower apparent conductivities suggest a greater effect from bedrock, therefore indicating a thinner soil cover. Discrete areas of elevated conductivity within a limited areal extent can be an indicator of subsurface sinkhole development activity.

ARM EM31 Towed System

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