Ground Penetrating Radar is a geophysical method used for detecting underground storage tanks (USTs) holding petrol, diesel and other volatiles at service stations, transport depots and numerous other industrial sites. When longtanding sites are redeveloped, problems arise where more than one generation of tanks are present. Before the modern era of strict environmental regulation, when new tanks were installed at a petrol station, the defunct tanks may not have been extracted. All too often the USTs were simply abandoned in-situ still containing remnant petrol or diesel, or infilled with concrete or water.