When the embankment reached 4m in height, toe failure oc-curred. Subsequent hydraulic sand-filling work was temporarily suspended to prevent more toe failures from occurring at differ-ent locations of the embankment. From site inspection, the toe failure was believed to be caused by wash water transporting the hydraulic sand-fill at the top of the embankment at that stage of the construction, seeping downwards through the embankment sand-fill and building up in the embankment. The possibility of rapid and considerable build up of pore water pressure within the embankment during hydraulic sand-filling therefore needs to be investigated, and a remedial proposal is to be recommended.