Question $1(10$ points$)$

The average carcinogenic risk from chloroform due to dermal contact of soil by on$-$

site workers at a landfill is nearly. Assume $IC=2\mathrm{.}9{10}^{-9}C,$ where $C$ exposure

point concentration, $C=1\mathrm{.}14m\frac{g}{k}g($mean$)$ and $4\mathrm{.}1m\frac{g}{k}g($maximum$).$

$2\mathrm{.}67E-11$

$4\mathrm{.}56E-11$

$6\mathrm{.}70E-11$

$1\mathrm{.}98E-11$