Has anyone sold vacant land with a note carryback and been concerned that the person buying the land does something to create an environmental health hazard? 

New roof was put on 5  years ago, 2 phases of environmentals were done 2 years ago.

Risky for all sorts of environmental reasons of course, but wondering if you would go for it and why.

I encouraged and supported this idea because I reminded him that in pressure situations our body acts quicker than our mind and we need that conscious reminder to calm down.

Is that a conscious decision that on the next one to hire out the work instead so that you can grow the business?

Environmentally, well, the Government is a big part of it when it comes about construction, permitting and regulations, etc. 

I manage a 17+ year commercial building and environmental inspection firm in Texas.

I.e. what's if the Phase 1 discovers a serious environmental issue?

A small operator type tenant could go dark and then you the property owner are left with environmental problems at the site and possibly other sites surrounding it.With the sale leaseback you need to know who is going to guarantee it.

Call your Bureau of Environmental (fancy name for sewer) Services and ask.