$2-4$ Compute the drinking water equivalent level $($DWEL$)(\frac{g}{L})$ for methylene chloride based

on a ${10}^{-6}$ risk for a lifetime consumption of $2L$ water per day for a $70-kg$ individual.

$2-5$ Based on a ${10}^{-6}$ risk for a $70-kg$ individual consuming $2L$ of water per day, the DWEL for

a contaminant is $10\frac{g}{L}.$ What potency would produce this value?