Opening a kitchen window painted with LBP, for instance, while preparing food could cause lead contamination.

A lot of that will depend on your state's particular laws - both on how a non-leaking tank is to be decommissioned and how a leaking tank is handled.If there is a leak, now is the time to find out, and possibly back out of the deal, even if you sacrifice your EMD.Here in MA, someone who buys a contaminated property acquires the responsibility for cleanup. 

P1/P2 identified limits of contamination potential, and the clients (large national developers) enrolled in the local "Voluntary Environmental Assistance Program" (VEAP or VAP).

Moisture and other contaminants that can get into a refrigerant system, if its not evacuated properly can severely shorten the life of a compressor.Typical condenser costs 1,000 or so and proper install can be 6 to 8 hours depending on the system conditions.  

And depending on the amount of contaminated water flowing into the concrete, and the composition of the concrete itself--fillered or not fillered--mold could grow in the concrete.

I once was required to remove the top 6 inches of dirt from a 50 x 100 foot lot (asbestos contamination complaint from the clean air division of the Dept of Ecology).

If not, he stated that he could do a "sweep" for $250 that would identify if there is an underground tank with contaminated soil.

Even with the inspections, there is still a waiting period for using it for something other than a gas station, just because of the unknowns of gas vapors and potential soil contaminants. 

However, when one goes badly, it can be very expensive - hence the reason to spend $500 - $1K upfront to determine if you have contamination or not.If you find a mess, walk away and the lender/bank will have to disclose - in some jurisdictions they may have to remediate before they can sell.

He got caught, the materials are all co-mingled, and they now all have to be considered as contaminated with asbestos, even the sandstone which is extremely heavy.