Options to replace a failed septic leach field
Does anyone know what the options are to replace failed leach fields? I'm under contract to buy a park, and it has 2 active leach fields; one is 40 years old, and the other is 50. Both work presently. Each is big enough to service the park, but given their age, I'm expecting them to fail at some point in the future. I'm wondering what the options are when that happens. The advice I've seen is: find somewhere else to place a new leach field. In this park, there is nowhere else, minus decommissioning 4-6 occupied mobile home lots. I've heard it's possible, though costly, to dig up and remove all of the bad dirt, and replace it with new clean dirt. Does anyone have insights on this or other options?