During subsurface exploration for a new building, a sample of clay was recovered from a

depth of $15$ feet below the ground surface. The moisture content of the soil was

measured and found to be $20\%($dry mass basis, i$.$e$.,$ gravimetric$).$ At this site, the ground

water table is at a depth of $10$ feet below the surface. Calculate the following soil

properties: Degree of saturation, $Sr(\%),$ Total unit weight, $($pcf$),$ Dry unit weight $($pcf$),$

Saturated unit weight, $($pcf$),$ and the void ratio, e$.$