A rigid pavement is designed with a $10-$inch slab, an Ec of $6$ million $I\frac{b}{i}{n}^2,$

a concrete modulus of rupture of $432l\frac{b}{i}{n}^2,$ a load transfer coefficient of $3\mathrm{.}0,$ an

initial PSI of $4\mathrm{.}7,$ and a TSI of $2\mathrm{.}5.$ The overall standard deviation is $0\mathrm{.}35,$ the

modulus of subgrade reaction is $190l\frac{b}{i}{n}^3,$ and a reliability of $90\%$ is used alons

with a drainage coefficient of $0\mathrm{.}8.$ The pavement is designed assuming that traff

is composed entirely of trucks $(100$ per day$).$ Each truck has one $20-$kip single

axle and one $42-$kip tandem axle $($the effect of all other vehicles is ignored$).$ A

section of this road is to be replaced $($due to different subgrade characteristics$)$

with a flexible pavement having an SN of $4$ and is expected to last the same

number of years as the rigid pavement. What is the assumed soil resilient

modulus?