$4\mathrm{.}16$ A field compaction control test was conducted on a compacted lift. The mass of the

material removed from the hole was $1820$ g and the volume of the hole was found to be

$955c{m}^3.$ A small sample of the soil lost $17$ g in the drying test and the mass remaining after

drying was $94$ g $.$ The laboratory control test results are shown in Fig. P$4\mathrm{.}16.$

a$.$ If end$-$product specification requires $100\%$ relative compaction and

optimum $-3\%$ to $($optimum $+1\%),$ determine the acceptability of the field

compaction and state why this is so$.$

b$.$ If it is not acceptable, what should be done to improve the compaction so that it will

meet the specification?

Figure P$4\mathrm{.}16$