Downgrading from the TCE spill there is a drinking water well where the concentration of TCE in the water is only $70\backslash$mu g$/$L$.$ A $200$ m$3$ batch of this water is pumped out, and is treated in a closed reactor by adding granular activated carbon $($GAC$).$

c$.$ The water must be treated to meet the U$.$S$.$ EPA drinking water standard. What is the

MCL for TCE? $($check Appendix F$)$

How much GAC mass is needed to reduce the TCE concentration to the MCL $($see the GAC properties in Table $3.$B$\mathrm{.}5$ of your textbook$)$