Outfall No. 4 & 5 - Approved temporary works designs are to be followed onsite to ensure safe work conditions for all subcontractor's personnel in the deep excavations.  Trench sheetpiling and frames are to be installed and inspected prior to commencement of works and issuance of permits.  Permits and TBTs are to identify all hazards identified in the risk assessment and this communicated prior to start of works.
Hazard category: Unsafe excavations