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High-Resolution Geophysical Technologies
ARM Geophysicist scanning with GPR for subsurface voids and potential collapse features. |
ARM uses Ground Penetrating Radar (GPR) as a cost-effective method
that can be used to map underground utilities, pipes, storage tanks, drums, and
voids. Since the GPR is mapping features with different dielectric properties, the
method can be used as a cost-effective method to find both metallic, non-metallic,
and geologic features.
ARM utilizes a Geophysical Survey Systems Inc. SIR3000 GPR with a 400 Megahertz
antenna. The GPR unit is mounted on a three-wheeled cart with a built-in survey
wheel. This design allows for quick and accurate collection of GPR traverses in
the field. In areas where the use of a cart system is not possible, the GPR unit
and antenna can be removed and used with a 30-meter cable.
The main GPR unit is designed for use with different antennas depending on site
and project requirements. The 400 MHz antenna is considered to be the work horse
of the industry. It has a depth capability, depending on the soil composition, of
up to 13 feet with good shallow resolution of targets, such as utilities and voids.
A 200 MHz antenna can resolve targets up to 20 feet below the ground surface. The
1500 MHz antenna is used exclusively for scanning concrete for rebar, wire mesh,
and conduits within concrete.
ARM Geophysicist scanning with GPR for subsurface voids and potential collapse features.
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ARM has also been using its new GPR for a variety of environmental investigations
including underground storage tank (UST) surveys, buried drum investigations, and
subsurface utility mapping. ARM geophysicists perform spot clearing for borehole
drilling as well as site wide utility mark-outs on private property. Use of non-intrusive
GPR utility mark-outs can provide both increased project safety and avoidance of
utility repair and replacement costs.
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Applications:
- UST Surveys
- Buried Drum Investigations
- Subsurface Utility Mapping
- Sink Hole Void Investigations
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