$(6$ pts$.)$ We are designing a flexible pavement

for a highway using the AASHTO method to

carry a design EASL of $2^{**}{10}^6.$ It is estimates

that it takes about a week for water to

drained from within the pavement and the

pavement structure will be exposed to

moisture levels approaching saturation for

$30\%$ of the time. Use a reliability level of $99\%,$

a standard deviation of $0\mathrm{.}49,$ a design

serviceability loss of $2\mathrm{.}0,$ resilient modulus of

$9000l\frac{b}{i}{n}^2$ for subgrade, resilient modulus of

$450000l\frac{b}{i}{n}^2$ for asphalt concrete, CBR

value of $100$ for base course, resilient

modulus of $31000l\frac{b}{i}{n}^2$ for base course, CBR

value of $22$ for subbase course, resilient

modulus of $13500l\frac{b}{i}{n}^2$ for subbase course

to determine a suitable pavement structure.