Heilongjiang Province, Jiamusi City, waste landfill leachate equalization pond project, with a capacity of 16,000 cubic meters, featuring a 1.5mm smooth geomembrane + 600g monofilament geotextile impermeable structure. Post-construction, geomembrane leakage and damage detection was conducted, revealing 3 virtual weld leakage points in the geomembrane seams, which were repaired and passed re-inspection.