A proper geomembrane installation and associated construction quality assurance (CQA) are always crucial to the long-term performance of geosynthetic lining system. Traditional geomembrane CQA program focuses only on quality of welded seams through destructive and non-destructive tests. To ensure the sealing integrity of installed geomembranes, leak tests and field monitoring are designed to lo-cate leaks in installed geomembranes during and after construction, and even when the facilities are in operation. A new generation leak location liner system has been developed, successfully tested and veri-fied as a reliable and effective technology that significantly enhances the quality of liner leak detection surveys at post-installation and long term monitoring of installed geomembranes during operation. This paper presents two environmental containments located at southwest China that using leak location liner system. The first project is a hazardous waste landfill designing with double liner system, and the other is a demonstration pad carried out at an industrial waste facility. Field investigations performed by third par-ty surveyors have successfully and accurately located the holes that are either occurred during installation process or intentionally placed. Results from the field surveys performed at the two projects in China demonstrated again that the improved leak location liner system associated with electrical liner integrity survey and permanent leak monitoring technology can further reduce the risk of loss of containments, po-tentially enhances environmental and economy sustainability of geomembrane lined facilities.
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