WATER LEAKAGE SPOT LOCATING METHOD IN FINAL WASTE DISPOSAL PLANT

PROBLEM TO BE SOLVED: To realize a locating method, for a water leakage spot in a final waste disposal plant, in which the water leakage spot can be specified effectively and efficiently by applying the method to an existing disposal plant in which a water leakage spot detecting system is not installed. SOLUTION: After a boring pipe 50 for tracer injection reaches protective soil in the upper part of a water cutoff sheet 51, a liquid tracer T is injected into a protective layer through the pipe 50. The tracer T is diffused in a nearly circular shape around an injection point on a linear sheet 51. When a water leakage spot S exists in its diffused area, a part of the tracer T creeps into a ground water collecting and discharge pipe from a branch pipe near the water leakage spot S. Consequently, until the tracer T is detected in a collecting-and-discharge-pipe terminal E, the tracer T is moved sequentially, by keeping a required time difference, to the upstream side from the downstream side in the tracer injection point. When the tracer is detected in the terminal E, it is found out that the water leakage spot S exists in a tracer diffusion region in the tracer injection point.