The Image above is from a survey of a former gas station conducted by Great Lakes GPR.

​​Ground penetrating radar (GPR) offers the means to detect embedded or hidden objects within the near subsurface. This non-destructive method uses electromagnetic energy to detect reflected signals from subsurface structures. GPR can be used in a variety of media including concrete, brick, asphalt, and soil. GPR can detect objects, changes in material, as well as voids and fractures.
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GPR uses transmitting and receiving antennas. The transmitting antenna radiates short pulses of the high-frequency (usually polarized) radio waves into the surface. When the wavelet hits an embedded object or a boundary with different dielectric constants the receiving antenna records variations in the reflected return signal.

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Applications for GPR

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• Utility location
• Conduit location  
• Reinforcement location  
• Post tension cable location 
• Slab thickness 
• Voids 
• Underground storage tank location 
• Drum location 
• Duct bank location 
• Septic system location  
• Wall and ceiling surveys 
• Structural boundary surveys  

• Soil interface survey 
• Detection of bridge deterioration 
• Site assessment for Phase II investigation 
• Water table mapping  
• Shallow bathymetry investigation  
• Engineering site investigations  
• Hydrogeological investigations  
• Detection of sub-surface cavities  
• Location and orientation of buried metallic objects  
• Archeological investigations 
• Forensic investigations