TRI provides a complete set of resources to help our clients test the integrity of their geomembrane lining systems in a variety of containment applications, such as for landfills, potable and waste water installation, and secondary containment for fuel storage and tank farms.

Our powerful, standards-compliant methods & equipment are unrivaled for locating leaks in installed geomembranes in avariety of conditions, including exposed and soil or water-covered. We can provide equipment & training for you to perform your own in-house surveys or to add surveying to your company’s current service offerings.

Liner Integrity Surveys are used to locate leaks in installed geomembrane containment structures such as:

Landfills
Reservoirs
Liquid Impoundments
Heap Leach Pads
Leachate Ponds
Wastewater Lagoons
Lined Tanks
Secondary Containment for Fuel Storage

Survey Methods

Liner Integrity Surveys can be performed on bare geomembranes as well as geomembranes covered with earthen materials, water or wastewater. Electricity is introduced above the geomembrane and grounded to the subgrade below the geomembrane. Since geomembranes are electrically isolative, the methods track the electrical current travelling through holes in the geomembrane.

The current is tracked differently depending on whether the geomembrane is covered or exposed.

For bare geomembranes, water is sprayed onto the geomembrane to carry the applied current, or a high voltage is introduced above the geomembrane to create an electrical arc in the presence of a leak.

The following ASTM Methods have been developed for Liner Integrity Surveys:

Guidance for Method Selection:

ASTM D6747 “Standard Guide for Selection of Techniques for Electrical Detection of Potential Leaks in Geomembranes”

Bare Geomembrane:

ASTM D7002 “Standard Practice for Leak Location on Exposed Geomembranes Using the Water Puddle System.”
ASTM D7703 “Standard Practice for Electrical Leak Location on Exposed Geomembranes Using the Water Lance System”.
ASTM D7953 “Standard Practice for Electrical Leak Location on Exposed Geomembranes Using the Arc Testing Method”

Covered Geomembrane:

ASTM D7007 ”Standard Practice for Electrical Methods for Locating Leaks in Geomembranes Covered with Water or Earth Materials”