Is there hardwood underneath?

The soil was remediated on March 24th and now we are just waiting for the No Further Action letter to close.

Also, you'll need to know if the property is "buildable" - which requires a soil test and more. 

Impossible to tell without looking at it, but typically saggy floors in older buildings are caused by rotten floor joists, for which the fix would be to jack up the floor and add some posts/supports underneath (assuming it’s accessible, if not you’d have to rip the floor up to see).

Obviously, we have perc tests, soil samples, environmental studies, etc, we just need to know what steps to take to properly make this work. 

That's a huge X-factor in it all, soil corrections and utilities is a whole thing in and of itself, lots a person can do that add's or minus's tens if not hundreds of thousands. 

I could see tile underneath, and from the appearance I believe it may contain asbestos.Since I haven't dealt with homes this old before, that then triggered the thought that there may be other materials in the home that contain asbestos.

One side of this Z flashing slips up underneath that bottom siding board.

Master leases are ones with leases underneath it.

Do locals rely on geologists as well as soil scientists and professional engineers (PEs) for obtaining septic permits?