Simple removal could cost $3500 but if there is leaking into the soil it could cost $10k-$20k easily is my understanding.Does this make this a potential seller financing deal? 

I have quite a few rentals and have big things delivered like gravel, soil, pavers, lumber, appliances or use a small utility trailer with my minivan. 

Sandy Springs).

Every part of town has it's quirks like some parts you really need to check out the houses foundation/basement as there are heavier clay soils, some are full of meth heads, some at first blush may appear not too attractive but drive around and you'll find lots of older people still living there taking care of their yards, keeping everything up though the racists will say the houses aren't worth anything.   

No state income tax leaves you with Wyoming.Washington.Texas.South Dakota.Nevada.Florida.Alaska.subtract SD and AK for snow/freezing tempsSubtract Florida for hurricanes and high insuranceSubtract Texas for high property taxes and some areas with bad foundations/soil conditionsyou could say that also leaves Washington and Wyoming but I’m subtracting them for weather and other personal reasons. 

Soil is in restricted soil area (perc test will be available in Feb in our area).Keeping in mind this is a 1/2 acre plot with 1/4 acre plot across the street, 5-6 outbuildings (chicken coop, outhouse, garage, ~100 sq ft shed w/ electric, cinderblock smokehouse, fire pit, and other shed).

Only if you are experienced and have done soil testing and then there is still a risk.

... soil contamination, airborne particles, neighbors, worker safety...

Get some exact numbers for the well- the number of feet you need to go down, the soil type and quality of water all matter

I think Newberry Springs was where that movie was about with Sandra Bullock where the electric company dumped crap into the soil and it contaminated the water in Newberry Springs, caused cancer and killed people.