This includes assessments for issues such as lead-based paint, asbestos, mold, or soil contamination.

If you get a phase one and later the sight is contaminated you can often deploy the (innocent landowners defense).

Whiting is one of those areas that you need to be a bit careful though, Them and more so East Chicago have had a lot of incidents of lead and arsenic pollution in the soil.https://wgntv.com/2018/05/08/more-lead-contamination-found-in-nw-indiana-soil/

Fire damage--remove and replace; smoke damage--clean and deodorize (keep in mind that pretty much everything in the same airspace will have some measure of smoke contamination--this even includes the HVAC ductwork) ; water damage--mitigate and dry out (but if its remained wet for a period of time you might be looking at mold--remove and replace).

And, that's assuming that it is properly zoned, there's no contamination from a prior use, and if it's even a buildable lot. 

No, Jenni and Joe, I meant PEX.First, PEX, as several web sites have pointed out: More susceptible to contamination.

Hi everyone, I have a condo under contract that just tested positive for meth. 8.3 over 3 samples, so relatively low contamination.

Buyer has the Right to Terminate under § 25.1, upon Seller’s receipt of Buyer’s written Notice to Terminate, notwithstanding any other provision of this Contract, based on Buyer’s test results that indicate the Property has been contaminated with methamphetamine, but has not been remediated to meet the standards established by rules of the State Board of Health promulgated pursuant to § 25-18.5-102, C.R.S.

Working with environmental contamination or complex title issues are examples that come to mind. 

Completed Phase 1 & Phase 2 Environmental Studies to determine any underground contaminants.