Heres the situation - my home used to have an oil room holding one of those large steel tanks.
whoever removed the tank didnt fully remove the metal attaching to the tank ( small bits visible ) but the big problem is that the cement used to cover the hole is very uneven and raised a few inched from the level of the rest of the basement
The section is about 2.5 X 1.5 feet right against the wall. im not sure if its releveant but sections of this cement look discoloured - old oil maybe?
any help would be greatly appreciated.