$6($a$)$ An in$-$place density determination $($in$-$place

unit weight$)$ is made for the sand in a borrow pit using a balloon$-$type density apparatus. The damp sample dug from a test hole

is found to weigh $8\mathrm{.}5$ lb$.$ The volume of the

test hole is $0\mathrm{.}065$ ft$3.$ From these data, compute the wet unit weight of the soil.

$($b$)$ This soil is found to have a water content of

$15$ percent. Compute the dry unit weight of

the soil and, by referral to Table $3,$ indicate

the probable condition of the natural material.