GEOMEMBRANE ELECTRICAL LEAK LOCATION SURVEYS

THE PROCESS

The Leak Location Survey and Liner Integrity Survey method

This method of Leak Location is used for detecting and locating leaks in geomembrane liners that are exposed and that contain liquid or solid materials. In general, a voltage is introduced across the liner system being tested between two electrodes. One electrode is placed in a conductive medium beneath the liner being tested and the second electrode is placed in the contained material above the liner being tested or within the water source for exposed liner testing. If there is a leak in the liner a current will flow through the leak. Handheld Leak Location Survey specialized voltage meters are utilized to detect the location of the electrical potential through the leak.

The following conditions must be met in order to perform a successful Leak Location Survey or Liner Integrity Survey. There must be a conductive medium above the geomembrane, there must be a conductive medium in the holes through the geomembrane and there must be a conductive medium beneath the geomembrane. Additionally, there must not be any contact with the medium above the geomembrane and below the geomembrane other than through the holes. The goal of the survey is for current to flow only through leaks in the geomembrane.
There are four general Leak Location Survey methods including, liquid – wading survey utilizing a submersible hand held probe, a liquid – deep survey utilizing a Leak Location remote probe, a Leak Location water probe or a Leak Location water lance survey performed on slopes and exposed geomembranes and a soil covered geomembrane survey utilizing a soil hand held Leak Location probe.
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