Liner Integrity Surveys are used to locate leaks in installed geomembrane containment structures such as:
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.” Also applicable to water lance.
ASTM D7703 “Standard Practice for Electrical Leak Location on Exposed Geomembranes Using the Water Lance System”.
New ASTM currently on ballot: “Electrical Leak Location on Exposed Geomembrane” includes the arc testing method among the previous methods.
Covered Geomembrane: ASTM D7007 ”Standard Practice for Electrical Methods for Locating Leaks in Geomembranes Covered with Water or Earth Materials”
Filthy water cannot be washed.
West African Proverb