Underground Storage Tank Removal

Underground storage tanks (USTs) hold gasoline, diesel, heating oil, waste oil and chemicals. Removing one is dangerous: leftover vapors can explode, the tank can be a confined space, soil may be contaminated, and the excavation can collapse. This is work for certified, experienced contractors, not a do-it-yourself job.

• Environmental & Excavation Contractors
• Property Owners
• Site Managers

Why USTs are dangerous

• Explosion and fire: even an “empty” fuel tank can hold enough vapor and residue to explode when cut, moved, hit or exposed to static or sparks. A fuel-vapor mixture burns in a narrow range, and old tanks often have rust holes that let air in.
• Confined space: tanks are confined spaces with possible low oxygen, toxic vapors and no easy exit. See Confined Spaces.
• Toxic exposure: petroleum vapors, benzene and other chemicals harm workers. See Benzene and Solvents.
• Cave-ins: tank excavations are deep and may be unstable, with soil softened by fuel and water. See Trenching Basics and Protective Systems.
• Contaminated soil and groundwater that requires testing, handling and disposal. See Contaminated Soil.
• Heavy lifting: tanks weigh thousands of pounds and need cranes and rigging. See Rigging Basics.
• Buried utilities and piping, including fuel lines, vent lines, electrical conduit and nearby pipes. See Utility Strikes.

Rules and permits

• Federal rules: the EPA’s UST regulations (40 CFR Part 280) cover many tanks that hold petroleum or hazardous substances, including requirements for permanent closure and removal. Some small tanks, such as home heating oil tanks, farm tanks and others, are exempt from federal rules but may be covered by state or local law.
• State and local rules often require permits, advance notice to the regulating agency and the fire department, a licensed or certified remover, inspectors on site, and soil sampling and reports. Notification is often required well in advance (federal rules call for notifying the regulator before closure; check the timing in your state).
• OSHA rules apply to worker safety: excavation (Subpart P), confined spaces, hazard communication, hot work, respirators and hazardous waste operations (HAZWOPER, 29 CFR 1910.120) where contamination is involved. See Hazard Communication.
• Fire codes (NFPA 30 and local fire codes) set rules for flammable liquid tank removal. See NFPA 30 and International Fire Code (IFC). Codes change, so check the current rules.
• Property transactions: lenders and buyers may require assessments. Owners remain responsible for contamination.

Planning the removal

• Hire a qualified contractor with UST removal certification where required, experience, insurance and a written safety plan. Check licenses and references. See Hiring Contractors.
• Find all tanks and lines. Use records, a site survey and ground-penetrating radar or magnetometer to locate tanks, piping and vents. Old properties may have forgotten tanks.
• Call 811 and arrange private utility locates, and shut off and lock out fuel pumps, dispensers and electrical equipment. See Call 811 and Private Utility Locating.
• Prepare the site: fence the area, remove ignition sources, post no-smoking signs, protect nearby structures, plan drainage and spill control, and keep people and traffic away. Notify the fire department as required.
• Plan for vapors: choose the purging and inerting method, gas monitoring and ventilation, and an emergency plan. See Inerting & Purging Lines and Tanks.
• Plan waste: arrange for removing product and sludge, tank cleaning, transport and disposal of the tank, liquids and contaminated soil by licensed haulers.

During removal

• Pump out and clean. Remove all liquid and sludge before the tank is moved, using proper bonding and grounding to prevent static sparks. See Static, Bonding & Grounding.
• Make the tank vapor-free or inert. Typical methods include displacing vapors with an inert gas such as nitrogen or carbon dioxide (dry ice is used in some practices, with careful handling), or ventilating with blowers on a controlled basis. Monitor the tank atmosphere with a combustible gas indicator. Keep ignition sources away from vents and openings. Never rely on smell.
• Expose the tank carefully. Excavate by hand or with vacuum near the tank and lines, support the walls, and keep equipment away. Don’t use metal tools that can spark on the tank if vapors might be present. Keep a competent person on site. See Competent Person Inspections.
• No hot work (cutting, welding, grinding) on or near the tank unless it has been cleaned, tested and permitted. Use cold methods when possible. See Hot Work Permits.
• Lift with proper rigging. Use a rated crane and slings, lift points rated for the tank, and a trained rigger. Don’t lift a tank full of liquid or one that is damaged without an engineered plan. Keep everyone clear of the swing and load path. Plug openings, and label the tank. See Equipment Basics.
• Handle confined space entry with permits, air testing, ventilation, retrieval lines, a standby and rescue. Avoid entry whenever possible. See Manholes & Underground Vaults.
• Check for leaks and contamination. A third party (inspector or environmental consultant) checks the soil and groundwater, collects samples and prepares reports as required. Odors, stained soil and sheen on water are signs of contamination.
• Wear PPE as required: flame-resistant clothing where appropriate, gloves, boots, eye protection and respirators fit-tested for vapors. See Respiratory Protection and Flame-Resistant Clothing.

After removal

• Handle the tank: after it is cleaned and declared free of vapors, it is cut up or transported to a licensed recycler or disposal site, with required paperwork, as regulations direct.
• Test soil and groundwater and report any release to the agency right away. Contamination triggers cleanup duties. See Contaminated Soil.
• Backfill and restore with approved material in lifts and compact as specified, after the regulator allows. See Backfilling & Compaction.
• Keep records of closure, sampling, disposal and permits. Owners should keep them permanently, since buyers and lenders ask for them.
• Keep the area secured until the excavation is filled or covered.

Tank removal checklist

• Permits, regulator and fire department notifications and a certified contractor are in place
• All tanks, lines and utilities are located, shut off and locked out; 811 was called
• Ignition sources are removed; the tank is pumped, bonded and made vapor-free or inert, with continuous gas monitoring
• No hot work or confined space entry without permits, testing and rescue plans
• The excavation is supported, and lifts use rated rigging by trained riggers
• Soil and groundwater are sampled, releases are reported, and records are kept

Last updated: October 5, 2026