Underground Oil Tanks were once highly used due to the belief that it was less of a fire hazard than oil tanks above ground. Although, within time home owners learned that the metal tanks were prone to failing due to rusting. These failures were leaking tanks that cost environmental damages and home owners expensive repairs. An Oil Tank Sweep is performed to identify the existence or non-existence of an underground oil tank on a particular property using a subsurface detection instrument and visual cues.