I realize that the photo my be difficult to see; however, what is shown here is very important. The thin line you see horizontally across the photo is the edge of the oil tank. The right side of that line appears to be significantly thicker than the left side because it actually is. This tank was flush up against the basement wall of a home in Philadelphia. Over time, the lime from the wall deteriorated the steel of the oil tank. We have performed removals where, once drained, the side of the tank remained attached to the wall. Had this tank been filled again or left abandoned, it would have soon began to leak.