In most instances disposal is jammed and simply inserting an allen wrench underneath disposal will unjam or pushing reset button. 

Our agent said KC, MO has clay in their soil and it's not uncommon to get foundation fixed.

What is the process if removed a underground oil tank and the soil is contaminated?

It is much more profitable to own the land underneath, and have a mobile home park.  

If there is any liability it's minimal, as they are inspecting and not certifying the property.There could be natural springs and if so I can understand why the buyers would back out.You might need a soil scientist to look at it and if he/she agrees with the inspector than see what the solution is. 

They jack hammer around the base of the wall, excavate the soil and put in a perf pipe and stone. 

I have read/heard that it's best to start "in your own back yard" to get the feel of being a landlord/investor, but when my backyard isn't the most fertile soil, I may need to cast a wider net.  

Linoloeum has been around far longer than vinyl and when vinyl appeared on the scene in the 50s/60s, folks continued to refer to the roll/sheet flooring as linoleum.Linoleum is frequently used in commercial settings such as hospitals, care homes, daycares, schools as it wears well (colour is all the way through) and is naturally antibacterial - we recently bought a house built in the 1930s which still had the original linoleum underneath vinyl loose-lay fibre floor in one of the kitchens ... the linoleum was in better shape than the vinyl.These days linoleum is a little more expensive than vinyl, but comes in lots of fun, funky colours and patterns {Google Forbo Marmoleum to get an idea}.  

Some areas near Niagara and Buffalo have very poor soil which means there are going to be foundation problems and I would not be surprised if the people come down with cancer because it was used by the military for disposing hazardous material a long time ago. 

What's the soil like?