If the liquid limit was $40,$ the maximum past pressure was $1000psf,$ the initial stress was $500psf,$ and the change in stress was $250$ psf$,$ what is a reasonable estimate of the coefficient of compressibility in $f{t}^{{?}^{{?}^{?}}}\frac{2}{?}$ day?

Figure $3-18.$ Correlations between coefficient of consolidation and liquid limit $($NAVFAC DM $7\mathrm{.}1)$

$1\mathrm{.}8$

$0\mathrm{.}3$

$0\mathrm{.}07$