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Elements and Performance Criteria

1. Prepare for underwater concreting
   • Identify and analyse work task and worksite data to determine the specific requirements for the concrete
   • Develop work plan consistent with dive plan
   • Select, inspect and prepare equipment
   • Secure concreting equipment safely to/from dive site
   • Assess access obstructions and other underwater hazards to determine risks and to manage risk control measures in accordance with dive plan
2. Concrete underwater site
   • Determine safety of work area at worksite
   • Prepare site in accordance with work plan
   • Assemble formwork to meet task requirements
   • Position reinforcing bars, rods, stirrups and mesh, bar chairs and spacers as required
   • Mix cement and deliver to site in accordance with work plan and concrete strength specifications
   • Take measures to confirm location and safety of divers prior to commencing pour, in accordance with operational procedures
   • Spread and screed concrete in accordance with work plan
   • Undertake tasks to finish surface, ensuring it is protected during curing
3. Complete underwater concreting
   • Minimise environmental impact arising from concreting and recover waste materials on completion of task
   • De-service and store all equipment, in accordance with operational procedures

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment. Non-essential conditions may be found in the Companion Volume Implementation Guide.

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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria on at least one occasion and include: applying relevant legislation, standards and organisational policies and procedures applying underwater risk control measures and work plan requirements calculating cement mix ratios according to strength specifications completing underwater concrete work including: assembling formwork and stripping agent clearing and levelling site to prepare for pouring ensuring a consistent pour when delivering cement operating cement tools and equipment protecting concrete during curing conducting at least one of the following underwater concreting tasks: reinforcing pier legs placing footings laying a slab or ramp. developing underwater concreting work plan planning underwater concreting work using floats and brooms to finish surface.

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Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of: concrete setting and strength specifications dive equipment dive physics dive physiology and medicine including: heat and cold illnesses compression illnesses decompression illnesses diving descent and ascent techniques general diving safety awareness including: diving in harbours diving in tidal waters, currents and tides diving on and/or near a ship’s bottom lost/separated entrapment/foul lines marine animal threats pollution/weeds working in confined spaces oceanography relevant legislation, standards, and organisational policies and procedures relevant risk mitigation organisational procedures including workplace hazard mitigation.

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