Geoelectrical Liner Integrity and Leak Location Surveys

Peak GeoSolutions is proud to announce the addition of Geoelectrical Liner Integrity and Leak Location surveys to our list of client services. Increasingly, regulators and design engineers are specifying liner integrity surveys as the final stage of liner CQA for landfills, leachate ponds, heap leach pads, and other primary and secondary lined containment facilities. This new trend is the result of comprehensive studies that indicate liner integrity surveys will significantly reduce the number of undetected defects in your liner system. Peak GeoSolutions believes that liner integrity surveys are a natural extension to our geomembrane liner CQA services, so we’ve invested heavily in staff training, certification and equipment. Peak utilizes the new Smart 3G leak detection equipment developed by TRI Environmental of Austin, Texas, and has pursued the industry leading LIS Certification program developed by Dr. Ian Peggs at ICORP. Geoelectric leak detection can be utilized in two different scenarios. Liner Integrity Surveys (LIS) are performed on new geomembrane liners as the final stage of CQA and Leak Location Surveys (LLS) are commonly performed on in-service geomembrane liners to detect and repair known or suspected leaks or to certify those liners as leakFree.

Soil or Water Covered Liners
The principle of the geoelectrical leak detection method on a soil or water covered geomembrane liner is to apply a voltage across the liner and locate points where electrical current flows through discontinuities (leaks) in the geomembrane. Voltage is applied to an electrode in the soil or water covering the geomembrane and to another electrode in a conductive material under the geomembrane liner. Because the geomembrane is an electrical insulating material, the applied voltage produces a uniform electrical potential distribution in the material above the liner when no leaks are present. If a leak is present in the liner the electrical current will flow through the leak, which produces high current density and a localized abnormality of the potential distribution in the material above the liner. Electrical measurements are made in the soil or water covering the geomembrane using either a dipole survey probe or scissor action water survey probe. A compact monitoring meter produces an audio signal that increases in intensity when approaching a leak, and then becomes immediately silent when the leak is passed. Two arrows on the meter will then indicate whether the leak is in front or behind the probe, and their intensity indicates the direction of the leak. The leak is zeroed in on as it is approached, pinpointing it in real time. Standard practices for this geo-electrical leak detection method are specified in ASTM D7007; Electrical Methods for Locating Leaks in Geomembranes Covered with Water or Earth Materials.

Exposed Liners
The geoelectrical method on an exposed or bare liner also applies a voltage across the liner and locates points where electrical current flows through discontinuities (leaks) in the geomembrane. Voltage is applied to an electrode in a water source above the geomembrane and to another electrode in a conductive material under the geomembrane liner. The conductive water is systematically applied over the geomembrane liner in a long water stream with a water lance probe. A compact monitoring meter produces an audio signal that increases in pitch and amplitude when the water flows through the leak. Standard practices for this geoelectrical leak detection method are specified in ASTM D7002; Leak Location on Exposed Geomembrane Using the Water Puddle System.

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Please feel free to contact us by your preferred method. We can be reached via the telephone at 877-721-4196. Our administrative email address is as follows: admin@peakgeo.com. If you would like to contact a member of our staff directly, please proceed to our personnel directory.

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Throughout the construction phase of this project, Peak’s team of professionals was extremely proficient and diligent in performing the required tasks and responding to key issues during the project. Peak’s hard work and proactive attitude resulted in a project that was completed on time and within budget.

Environmental Engineer
County Public Works Department