I went and looked at a place yesterday that had dips where the ground settled from leach lines. about every 3ft is a 3'x40' dip where the ground settled. Theres around 5 of them. What would be the easiest most effective way to fix this? Only thing I can think of would be to rent a bobcat, get a load of top soil dropped off as close as I can to the area, and fill in the dips. That would take a pretty large amount of soil though. Any other suggestions ? Thanks.