Not enough information.
2:1 slope is fairly simple math. Go down one foot, move horizontally two feet. So, if you go down 6 feet, go over 12 feet...but how far laterally? In order to figure out cubic yards, you have to have all three numbers. Also, one acre, one foot deep, is 1666 cubic yards.


Teach a man to grow fish...
He can teach to catch fish...