Oil Tank Removal in Westchester. Will Soil Remediation be necessary? A leaking oil tank poses a pollution risk and a fire hazard. If the tank is underground the leaking oil can easily get to groundwater contaminating it. (Click Here for more info.) If the tank is above ground leaks are easier to identify, but in the case, they go unnoticed the leaking oil can be a fire risk. However, oil tanks remediation NY experts say underground oil tanks have more serious leaks as they go unnoticed for a long time as the tank cannot be adequately inspected.