$3\mathrm{.}2\mathrm{.}3$ A pressure gage at elevation $18\mathrm{.}0$ ft on the side of an industrial tank containing a

liquid reads $11\mathrm{.}4$ psi $.$ Another gage at elevation $12\mathrm{.}0$ ft reads $13\mathrm{.}7$ psi $.$ Compute

the specific weight, density, and specific gravity of the liquid.

$3\mathrm{.}2\mathrm{.}4$ Where an underground oil pipeline crosses under a stream in a gully, it is $68$ ft