Australia Model Code of Practice: Managing Risks of Hazardous Chemicals in the Workplace 3.3b: 3.3 Work out who could be exposed, when, and how often

Workers can contact a hazardous chemical, and its waste, intermediates or products, if they work with it directly, are near where it is used or generated, enter an enclosed space where it may be present, disturb deposits during cleaning, or touch contaminated surfaces. Consider everyone, including support workers (cleaners, maintenance and laboratory staff are often exposed to both their own chemicals and others'), contractors, visitors, supervisors and managers. Consider how tasks are actually done (decanting, spraying, heating), the quantities, the effectiveness of controls (a poorly maintained ventilation system gives false comfort), technique, and lone workers who may need extra checks if incapacitated. Estimate duration and frequency from observation, including routine daily exposure, non-routine work, batches, trials, maintenance and changes such as breakdowns and weather, and treat workers with different hygiene habits separately.