Hoping it's not a tank but very possible. Most tanks have threaded neck/caps, and the neck is filled with dirt so I'll have to poke around and vacuum it out.
Maybe an abandoned fuel or holding tank? I have heard people filling them with sand/dirt once they quite using them in order to satisfy regulations and prevent the cost of removal of the tanks.
No idea, but I will say I enjoyed the video and commentary Dirty windows clinched it for me as a movie set with the front moving in. what I do see also is that it looks like that flange is cast in after the original slab was placed. To me that would say someone had replace the original conduit going down, or it was cut in and is just meant to perc what ever was going down. Concrete doesn’t look oil stained to me.
Just a stab in the dark, wonder if its something that they would have used as a mounting base for some type of fixture base like a small crane or shop equipment stand?
Usually underground tanks would have a fill pipe and a vent pipe. If it was an old tank that they filled it would seem odd to go through the trouble of unscrewing the fill pipe to put in that sleeved pipe plug you have. I agree with Creekin and Jack Straw, it appears to be some some of mounting base for a piece of shop equipment. I’d guess that square of concrete around the pipe is deeper/thicker than the rest of the concrete floor.
Rather heavy gauge pipe for a tank, plus it's pretty easy to shine a tube down a hole to see if it is anything more than just a hole. A davit or floor stand would need a rather heavy pipe. Was the stove a heater or a forge ?
My dad built in the 70's, and has floor drains in garage and shoppe. Look much like these. They drain under the floor to the outside. Sca
