Building codes in Rhode Island (and most States) do not allow oil uncoated oil lines to be directly encased in concrete or buried in the ground. Not too long ago, It was common practice to lay a copper oil line on the base of a basement floor before the concrete was poured. At the time, it was best-practice as the line was protected from physical damage. However, the line can corrode and begin leaking under the floor. It may not become apparent until you notice excessive oil consumption or stains coming up through the concrete. By then, you have a major problem as the cleanup can cost thousands of dollars.
The old line will be purged of remaining oil and disconnected from the oil tank and heating equipment. The exposed sections will be removed and disposed at the point where they exit the floor. A new coated copper oil line will be installed either overhead or on the perimeter of the wall if possible. In some cases, an overhead oil line may require the installation of a de-aerator. If needed, a new filter assembly may be installed along with new valves and fittings. The new line will be placed in service and the heating system restarted. This service is typically completed in two hours and can be scheduled mornings or afternoons.