Bird
Rest in Peace
they did not put a clean out port on the back half.
In our area, at least, it was apparently common practice to bury the first and last tanks, so if they ever needed pumping, you'd have to dig to find the lid. But I told my installer to begin with that I wanted a concrete "collar" larger that the lid to the tank that came to the surface, then a flat concrete lid on that, so I could open it anytime I wanted to without digging. I think he said the top of the tank was supposed to be a minimum of 6" below grade. Anyway, here's some pictures at a time when I had not re-established any lawn.