METHOD FOR REPAIRING SHIELD LAYER IN ENVIRONMENTAL POLLUTANT DISPOSAL PLANT

PROBLEM TO BE SOLVED: To repair a shield layer in an environmental pollutant disposal plant without almost performing the excavation of topsoil. SOLUTION: In an environmental pollutant disposal plant wherein a hexavalent chromium polluted treated soil bed 2A being a pollutant bed is covered with a shield layer 3 and the shield layer 3 is covered with topsoil, when a hole is bored in the shield layer 3 and a pollutant is leaked to the outside, a chemicals injection well 15 piercing the topsoil 4 from ground surface to reach the upper surface of the pollutant bed 2A is excavated on the upstream side of the leak part 5 and chemicals becoming water-impermeable in a stage spreading to the leak part is injected from the chemicals injection well 15 to be allowed to spread over the surface of the pollutant bed 2A of the leak part and, thereafter, the chemicals injection well 5 is closed to simply and rapidly repair the leak part 5 from the ground.