impact environmental

Using Ground Penetrating Radar (GPR) to Detect Underground Injection Wells (UIWs)

GPR provides a reliable means to detect underground injection wells (UIWs). Generally, the location of underground injection wells can be readily determined due to the contrast in dielectric constants between the UIW walls and the surrounding subsurface material. A void space is often detected between the walls of the UIW structures. The GPR can also be used to track the associated piping leading to and from a UIW.


Radar image of an inaccessible subsurface drywell with a concrete access cover. The drywell was scanned with a 200 MHz antenna without signal filtration.	Radar image of an accessible subsurface drywell with a steel manhole cover.	Image of a cesspool full of sludge and liquids which are highly reflective due to their moisture content (in contrast to the void space shown in the two images to the left).