"I’m considering buying a 1950s house on Long Island. There’s a vent pipe from an old oil tank visible on the property next to the base of the home. The current owner maintains the house has always been fueled by gas since she has lived there over ten years. She cannot produce certification the tank was removed or abandoned properly. The home inspector could not find evidence of a tank ever having been in the basement or a fill cap anywhere outside. How do I find out if an old oil tank is still there now or if it was removed properly? And if I can not, should this be a deal breaker?"