There is no need to fill your geomembrane with water to test for leaks, depending on the liner system configuration. The ASW technician will use a Leak Location Survey water probe which directs a positively charged stream of water on the exposed geomembrane. Reference ASTM standard D-7002 for Leak Location Survey procedures. When the water contacts the negatively charged sub grade through the hole in the liner current flow through the hole is measured.