The old septic tank lid is behind the bucket.
The old, non conforming plastic tank is removed.
It lasted seasonally for 35 years, but never ever use perforated pipe. This was perforated from the moment it left the tank (and thus is plugged solid).
A new 1250 gallon tank is inserted (happy to report the tank was made locally in San Luis, Colorado).
Fully installed, the tank should last for forty years, so said the installer.
A modern leach field, unlike any I have seen before.
These guys are awesome. They did all this between 10 am and 5 pm in a single day.