UST's ("underground storage tank") detection, location at a very reasonable price. We'll also find the pipes, so they can be removed. Technology includes magnetometry, RF, ground radar, and vapor sniffers such as the ones used in industry. Real estate procedures practically mandate that homes get an independent test for oil tanks, which were popular until the switch to gas in 1957. Mortgage companies seem to require UST removal, too. The provincial regulations have some exceptions, such as when the oil tank cannot be easily accessed by heavy equipment.
