$4\mathrm{.}3$ Construct a bar chart to use in managing the construction of a single$-$span bridge. The identified activities are

$$ Drive piling west abutment $($WA$),2$ days

Drive piling east abutment $($EA$),2$ days

Construct WA cast in place pile cap, $3$ days

Construct EA cast in place pile cap, $3$ days

Each pile cap requires $5$ days curing time before the precast girders can be placed.

Set girders, $1$ day

Construction of cast$-$in$-$place concrete deck, $7$ days

Cure deck, $14$ days

West and east concrete approach slabs, $5$ days each

There is only one crane available for pile driving and setting girders. The company plans to use only one crew of carpenters and finishers for the concrete work.

a$.$ What is the project duration?

b$.$ Are the two "construct approach slab" activities critical to the project completion?