Three acres three inches deep is 403.33 cubic yards.
672.28 cubic yards.
2.2222222 cu. yards
40.1 cubic yards
.617 Yards
259.2593 sq. yards.
6 inches = 1/6 yards. So 70 sq yards * 6 inches = 70*1/6 cubic yards = 11.66... cubic yards.
15.833... [cubic] yards.
2.2 Yards
1.851852 cubic yards
13.1 cubic yards, approx.
You'll need 1.23 Cubic Yards.