A $20-$inch$-$wide by $3-$foot$-$deep trench is dug in the ground and a sewer line with a $10$ inch outside diameter is placed in the trench. The sewer line is placed on $5$ inches of bedding, and bedding partially surrounds the pipe to a height of $2$ inches above the bottom side of the water line. The length of the trench is $600$ feet. Determine;

$1.$ Volume of excavation needed,

$2.$ bedding needed, and

$3.$ backfill is needed for the water line.