Tokyo Gas, the utility whose land it was, is removing 2m (6.6 feet) of topsoil, and 2.5m of fresh soil is going on top, but environmentalists say that an earthquake or a tidal surge would bring the benzene straight back up to the surface again.

• 东京燃气因此将深达两米（6.；6英尺）土壤表面挖掉，填回了2