Just an update though - during home inspection we found settlement cracks located above garage door, several cupped shingles on the roof and some soil eroding near side grading.

The best part is the floor underneath did not need to be even close to perfectly flat.

There were areas that they the main crossed the sidewalk as well as the street but they were able to tunnel underneath both to lay the sewer line.  

Are there standard figures (or rules) I can use for estimates on design, soil tests, etc., or will I need to just call all the local businesses for estimates?

The envelope is a cheap one, and they can see the yellow pad paper underneath just begging them to open it.

Seller agrees to provide access for inspection upon reasonable notice.VIII.INSPECTION OF PROPERTY: Buyer shall have until the close of escrow to complete all Buyer investigations of the property, approve all disclosures, and other applicable information, which buyer receives from seller and/or persons hired to inspect property on behalf of Buyer; and approve all maters affecting the property, including but not limited to, the marketability of the property, the elevation, grade, and topography of the Property and to conduct engineering and soil boring tests as the Buyer deems necessary in order to determine the usability of the Property.

INSPECTION OF PROPERTY: Buyer shall have until the close of escrow to complete all Buyer investigations of the property, approve all disclosures, and other applicable information, which buyer receives from seller and/or persons hired to inspect property on behalf of Buyer; and approve all matters affecting the property, including but not limited to, the marketability of the property, the elevation, grade, and topography of the Property and to conduct engineering and soil boring tests as the Buyer deems necessary in order to determine the usability of the Property.

I also had a dishwasher leak and create a river underneath the floor through the entire dining room and part of the living room.  

They can soil your name on and offline, get the state bulldog (Atty.

Once I aquired the property we converted to gas and had tank filled with sand soil samples taken and the town signed off on it that it was properly abandoned.It was a biiger tank 1000 gal. that took up good paart ofo fron lawn and then underneath part of the driveway.