Original TLV: $100ppm$ Is $10-hr$ exposure of $80ppm$ acceptable? $($Note: exposure is TWA where the concentration is not based on irritation$)$

Worker is exposed to mixture $($in air$)$ of toluene $(8ppm),$ trifluorobro$-$methane $(400ppm),$ Stoddard solvent $(30ppm?$

What is the TLV of a liquid mixture of $3$ chemicals?

$)=(10$ Y $($TLV$=100),$ & $)=(1000$

If a sampling procedure calls for a minimum sample volume of $800$ liters and a flow rate of $1\mathrm{.}9lpm,$ how long do you need to sample to get the minimum requirements?