When it comes to dirt, check with the local cemeteries. They sometimes will let you have it for free. You just need to find a trucking co. that can haul the material for you. To figure the amount of material. length x width x depth(in tenths of a ft. not inches) \ 27= cu yds. x 1.3 ( converts tight yds. to loose yds. ) a belly dump holds about 20-22 yds. and a tandem holds about 12 yds.