We bought an acre property in central florida, where in the back of the property previous owner dug out two huge holes in the ground. Realtor called these holes "ponds" - NOT! Each is about 20'x20' and about 10' deep. They both have standing water on the bottom about 1ft deep. Ugly, dangerous and take valuable space that I could use to house chickens for example. I need to fill them in with something. Fill dirt is about $140 per truckload, not sure how much I will need, but it's quite a bit of money to go that route. Any ideas of cheap/free fill I can use or find? County is OK with filling these holes, no problem there.