I have to get rid of about a two yards of crap lava rock. I could go on and on about how much I hate it but thats a separate thread. Anyways if I hide it on the bottom of a a six inch base for a patio could I run into any problems later on? I figured I'll munch it up to dust when I run the flat wacker on it but anyways atleast it would be gone without hauling away. Thanks for any input!