Table $1$ in supporting document $4$ is an extract from the OH$$s

report.

Calculate the $8-$hour time$-$weighted average $($TWA$)$ exposure to

wood dust for Worker X$.(10)$

Note: Your answer should be based on information in supporting

document $4$ only.

$($ii$)$ Now that the SM has the OH$$s report $($supporting document $4),$

they can draw further conclusions.

Based on the information in the report, what was good about the

approach taken by the OH$?(4)$

$($iii$)$ Based on the SM$$s discussion with Worker X$,$ assumptions were

made about Worker X$$s exposure to wood dust.

Use the information in the OH$$s report to show that these

assumptions might be incorrect. $(6)$

Note: Your answer should be based on supporting document $4$

and the scenario only.

$($iv$)$ Suggest reasons why the OH is recommending a detailed survey of

workers$$ exposure to wood dust. $(9)$

$($v$)$ The OH made some recommendations in their report $($see

supporting document $4).$ One of these recommendations was to

carry out a detailed survey of workers$$ exposure to wood dust.

What should the OH consider when designing this detailed survey?