I am surprised you can't get any relief via state programs.......I do understand that the companies can't give a definitive price quote until they see the extent of the spillage...........my manager went through the same thing when she sold her parent's home.
Fortunately, the final amount wasn't as bad as what was initially feared.
I am going to ask around my office, and see if anyone has grappled with this kind of problem ..........I'll get back to you...if you want, send me an email so I can send you any information I gather.
I am really sorry - this is a terrible situation for you to face.
I'll try to help.....