This paper presents a case history of a distressed 6m to 10m high soil nailed slope formed for basement excavation at fill ground over a natural valley. Above the soil nailed slope, there is an existing 8m to 11m high reinforced soil wall, located 23m away from the soil nailed slope. During the early stage of excavation for soil nailing works, distresses like ground surface cracking and settlement were observed. Perched groundwater at the natural valley during the heavy monsoon season posed further difficulties to the drilling works and
induced instability in the steep excavated face of the fill materials. As such, a well planned instrumentation programme was implemented to monitor the construction safety of the on-going soil nailing works. Remedial solution using permanent steel sheet pile wall with two rows of soil nail anchorages is presented in this paper. The performance of the remedial works through instrumentation results and design verification tests of nailing are presented to illustrate their effectiveness and satisfactory performance even with the adverse rainfall event.