Ground Penetrating Radar (GPR)
GPR surveys can be a valuable resource for environmental professionals and are commonly performed during environmental subsurface investigations. The GPR method uses high-frequency-pulsed electromagnetic waves to acquire subsurface information. GPR equipment utilized for the measurement of subsurface conditions typically consists of a transmitter and receiver antenna, a radar control unit, and a data storage and display device. The transmitting antenna sends electromagnetic waves downward into the ground; as the waves encounter subsurface boundaries between media of different electromagnetic properties, the signal is reflected back up into the receiving antenna. These reflected signals are then recorded to produce a scan of the radar data and visual representation of the subsurface conditions. Under favorable conditions, GPR surveys can provide precise information concerning the nature and location of buried targets.
In the Environmental Consulting and Remediation Industry, GPR surveys can be a great way to noninvasively and cost efficiently:
- Locate orphan underground storage tanks (USTs);
- Identify locations of previously removed USTs (void detection);
- Delineate landfill boundaries; and
- Map stratigraphic layers under favorable conditions.
To learn more about the GPR method, or to find out whether GPR would work for your next project call EPS Environmental!
Example 1: Location of Orphan Gasoline UST at a Historic Filling Station
Example 2: Location of Removed UST (Void Detection) at a Recently Demolished Commercial Building
Example 3: Location of Orphan Heating Oil UST and Associated Piping
at a Commercial Facility