layer it in a stair like position. if that makes sense. make sure each stair is flat on top and bedded down and as high as feasilby easy to chuck new stuff on, then start a new stair, that way you can get a lot more in a small space and it looks neat. Of course it will need all people who chuck on to participate. Nothing more annoying than making a muck heap neat only to find the next person just dumps their wheelbarrow pile on the front without chucking it up.
If it is already out of control, so to speak, then getting someone to remove it and starting again may be your only option. Rotting muck heaps are a pain to try and get neat.
hope that helps
Dawn