Septic do i just back fill?

That will be completely dependent on local code/ordinances.
Here, any tank would have to be removed but the pipe and leach field can be left.
 
Many places will allow a tank to be properly decommissioned by drilling holes in the bottom (lets the ground water drain) and filling with sand, but I would check the requirements in your area.
 
Dont ask and leave it alone. Seal all the pipes. Unless the tank is in a spot where someone might park their cement truck.
 
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