you want to avoid hitting a sewer line.

Yea but most of that is confided within the concrete isnt it ? I always
thought the sewage lines from the house to the septic go out through the
side embedded within the concrete ... ? Or do the lines actually go
underneath the slab as well ?

if i were you i would just spend the bucks and have the pros install
the system for 800 bucks. around here its generally a few thousand.

Like I said , theres many complications with that. If I were to install it
outdoors , the fan would have to be outside...and temps get to -10
faurunheit in the winter here. Fan wouldnt last long. Plus this is an
unusual installation. The only estimates I ever got were for doing the
mitigation system inside....in the garage area. Which wouldnt work anyway.
Not sure if anyone would even work with my current situation.