So is my old neighbor. When I was looking for someone to yank my tank I first called the original abatement company that had filled the tank in 2000. He warned that it is possible that now the gravel inside the tank could be considered hazardous if it absorbed any oil residue that may have remained in the tank after he cleaned it. I had also talked to the head of the building dept. in town and he told me I would need no permits to remove the tank as it was signed off on thirteen years earlier. His words- You wouldn't need a permit to throw away and old wheelbarrow you found in your backyard. It's the same thing,scrap. My feeling, again, if I had a sign off from a licensed contractor for tank removal I was good in the eyes of a buyer, or their attorney. Around here I have had plenty of clients who won't even have the realtor slow down in front of a house with a UST in the ground, properly abandoned in ground or not. Better to face the music when time is on one's side than wait until you have a panicked buyer. On the attorney subject, I did once have a buyer who had knowledge of a tank that had been removed with all of the paperwork showing it was gone and all done properly. His attorney told him that he should do his own tank sweep in case there was another one somewhere on the property.