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Help with replacing underground oil supply line
I have an oil supply line (single line) buried in concrete somewhere underneath my basement foundation floor that runs to an outside tank. I'm in the process of finishing the basement, which will involve screwing wall plates and a plywood subfloor into the concrete floor with tapcons, so I'm nervous about hitting the buried line. I also understand that it's a good idea to replace buried lines anyway--it's uncoated as far as I can tell. I'd like to get all of the oil out of the buried line, abandon it in place and run a new line at floor level along the perimeter of the basement.
Could anyone advise how difficult a job it is to make the connections to the tank and the filter/burner? I've worked a lot with copper, PVC and PEX on water supply and DWV systems, but I'm worried I'm missing something tricky and there's not a lot of information online about this type of job.
Also, how would I remove the oil in the length of the buried line? I assume there is some way to blow it back into the tank or to siphon it into a receptacle.