Data and information for problems $18$ and $19$

A municipality is evaluating water sources that could be used to provide additional water for their city $($due to population growth, there is an increased demand that cannot be met using their current water supply$).$ The city's engineers intend to use $C{l}_2$ as the disinfectant. Assume that the following chlorine breakpoint curve was determined for one of the candidate water supplies. The graph was prepared using data collected in a laboratory test in which progressively higher doses of $C{l}_2$ were added to the water and then the total chlorine residual was measured.

Draw an arrow to indicate the location of the "breakpoint" on the curve shown above.

Assume that $1\mathrm{.}5$ million gallons per day $($MGD$)$ will be treated from the water supply exhibiting the breakpoint curve shown in the preceding problem. The free chlorine residual concentration leaving the water treatment plant is to be $1\mathrm{.}0m\frac{g}{L}.C{l}_2$ will be delivered to the facility in cylinders that each contain $150$ pounds $C{l}_2.$ The design engineer would like to have storage capacity to store a two week supply of chlorine. Based on this information, the number of cylinders that they should plan for when designing the storage area should be most nearly?

A$.2$

B$.3$

C$.8$

D$.9$

E$.18$

F$.228$