Volume

$V = A_bL$

Where

$A_b = 22(56) - 3[ \, \frac{1}{2}\pi (6^2) \, ] - 3[ \, 12(10) \, ]$

$A_b = 702.354 ~ \text{ft.}^2$

Thus,

$V = 702.354(50)$

$V = 35,117.7 ~ \text{ft.}^3$

$V = 35,117.7 ~ \text{ft.}^3 \times \left( \dfrac{1 ~ \text{yd.}}{3 ~ \text{ft.}} \right)^3$

$V = 1300.7 ~ \text{yd.}^3$ *answer*