Keeping investments fenced off into their own LLCs at scale is a hedge against the whole thing from collapsing if one deal goes bad or you have one lawsuit.

They have a major concern of static pressure from outside causing foundation to collapse.

If you spend your money buying an investment that provides $200 a month cash flow and then can't make enough in sales to feed your family, the entire thing could collapse and you'll be scrambling for a W-2 job with your tail tucked between your legs.

If the deal collapses and I would lose everything, I'm out.

If your house is one that has red clay tile (again probably pre 1975-78) then you should see trails across the floor where they have collapsed and created a flow issue.

So are we saving our clients from divorce and financial collapse?

It has to be for something a reasonable person wouldn't expect to catch, like a collapsed sewer line or termites in the walls.  

Would it be better to do a cash out refinance now and hold the equity of my home in case of a market collapse?

If the deal collapses and I would lose everything, I'm out.

Conn has a disclosure law and you have a right to terminate the agreement if you are not satisfied. while it may not be necessary to remove the tank, the seller should provide evidence that the tank was properly closed. since it was not filled with inert material, it does not sound like it was properly closed (if the tank is not filled, it could collapse later on from rust which could cause a cave-in of soil. also need to verify the sampling was done properly. samples collected from the side of the tank are not dispositive. need to confirm that a sample was collected from below the bottom of the tank. also- how shallow is groundwater?