In many cases a risk assessment for noise at a construction site can be prepared without using equipment to measure the noise levels. The assessment must be based on reliable information though and should include a realistic estimate of the employee’s exposure.
You may find it useful to observe work activities, measure the exposure time over part of the day and use this to estimate exposure during a full shift. If an employee is exposed to noise from more than one tool or work process during a typical day, you will need to collect information about the likely noise level(s) and exposure time for each source.
Information from manufacturers or suppliers about noise levels produced by the equipment can be used to calculate the daily exposure unless there is reason to believe it is not valid, for example if the tool is being used in a way not specified by the manufacturer or supplier, or in other circumstances where the noise exposure may be increased.