Ballpark cost of moving our aerobic septic tanks to another location on our property, maybe 35 yards? We want to build a driveway where the current tanks are located. And which companies could give quotes for that?
Likely not cheap, and will plenty of risk. fil built and installed tanks for years and moving them many times you ended up with cracks unless you they were installed with sand backfill. Helped transplant guts into new tanks at the new destination.
Think James Heath does fine work, was a customer of my fil until he sold his business. Moving tanks is lots of work and there are things you have too consider. Many times the oh we will just move them turns out to be non trivial to impossible. . For instance contrary to popular belief s#*t only flows down hill. If you move the tank 35 feet the inlet has to be about a foot lower than where it is now. If the natural grade is downhill to the new site it's helpful but if it's level or uphill not so good. If you have to burry deeper they you will need taller tank risers for access. So just be forewarned after dealing with the details it may be expensive and painful.
If concrete tank, take pump/equipment out, collapse tank and bury. Put new tank where you want it. Digging up and removing old tank could easily render old tank useless making it necessary to install new tank anyway.