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The most used and effective way of testing the liner integrity on green roofs is to survey using SENSOR DDS® technology. As the technology is based on the distribution of the geoelectrical field below and above the liner the problem could be presence of the thermo-isolation which is non-conductive.

Sensor leak detection geotextile is installed as a standard geotextile with an overlap of minimum 100mm. After installation of the geomembrane we can test its integrity using the SENSOR DDS® MIT portable Arc Testing device. In this step we can eliminate every pinhole found in flat areas or corners.

For the next step a drainage gravel layer is carefully installed on top of the tested roof liner.  The final test of geomembrane integrity is completed using our SENSOR DDS® Mobile dipole testing kit which identifies tiny damage caused by sharp stones when placing the overliner.

Exposed and covered liner integrity testing at Tailing Dam – Gold mining

A tailings dam is typically an earth-fill embankment dam used to store byproducts of mining operations after separating the ore from the gangue. Stored tailings can be liquid, solid or slurry of fine particles and are usually highly toxic. Therefore a protection of the environment surrounding the tailing dam should be the highest priority. To stop the leakage of toxic material from the tailing dam to its sub-grade and contamination of groundwater SENSOR DDS® technology should be used. To test the integrity of the sealing layer of a tailing dam after its installation in order to detect and locate the leaks we use the Arc Tester – SENSOR DDS® MIT. For testing the geomembrane integrity after placing an overliner (gravel) we use Sensor’s dipole testing kit SENSOR DDS® Mobile.

Arc Tester – SENSOR DDS® MIT and SENSOR DDS® Mobile dipole survey

General project info:

  • Area tested was 283 000m²
  • Single layer of HDPE 1.5mm geomembrane installed
  • Protective layer: 500mm gravel
  • For exposed liner testing Arc Tester SENSOR DDS® MIT was used
  • For covered liner testing SENSOR DDS® Mobile was used

Some photos from the SENSOR DDS® surveys at various gold mines’ tailings dams

SENSOR DDS® Mobile methodology can detect even multiple leaks when surveying on top of the drainage overliner
At this Tailing Dam the thickness of protective overliner was 600mm
At large scale projects we deploy more operators to perform SENSOR DDS® survey so your project is never late
When testing high slopes, the daily coverage of one operator is naturally slightly less then usual but we deploy more operators to complete the project on time
When anomaly is detected with SENSOR DDS® Mobile dipole, area of approximately 3x3m is excavated
Such damage can be caused only by sharp turn of the heavy truck on top of overliner. Luckily SENSOR DDS® technology can effectively detect it during testing

Municipal solid waste landfill

This is a site for domestic day-to-day waste disposal. Its also known as tip, rubbish dump, dumping ground, etc.

The material stored at a solid waste landfill is isolated from the environment by a sealing layer which can be HDPE or LDPE or even PVC geomembrane. If such geomembrane leaks, the contaminant from the landfill spreads in the direction of the groundwater flow. This way it can travel long distances and contaminate the environment for a long time. Such contamination can cause health problems and not just to the people living near the vicinity of the landfill.

In such cases we use the SENSOR DDS® Mobile – dipole survey after installation of the drainage/protective layer to locate any damage which could occur while placing the overliner onto the geomembrane. For example at a landfill in Asia where after the installation of the protective drainage layer we located 15 faults on the geomembrane using our portable testing device for covered geomembrane – SENSOR DDS® Mobile.

Some Images from Landfill Projects we have worked on

We perform quality control every step of the way in order to assure our clients that their investment is leak proof and damage free
Waterproofing geomembrane is exposed to the biggest risk during placing of first 4m of waste. We closely monitor it with SENSOR DDS® FIXED system
An example of the type of damage detected by the SENSOR DDS® MOBILE on covered geomembrane
When the geomembrane is installed, we test overall integrity using Arc Tester on bare geomembrane before the cover layer is placed