There is a great hospital, Northeast Georgia Medical Center in Gainesville as well as Gwinnett Medical Center in Lawrenceville.
There is a landfill in Sugar Hill area, but I do not believe is was a toxic dump. In fact, parts of it have been turned into a beautiful course. (Sugar Hill Country Club)
If I can help you with a home inspection give me a call.
Inspect-It 1st Property Inspection
I have never heard of a toxic dump in the area. I have been here since the mid 1970's.
Hope this helps. If you need mortgage help give me a call.