The time has come to Regulate Chemical AST's

 As of late Tuesday night, May 26, 2026, the emergency at the GKN Aerospace facility in Garden Grove has been resolved, and all evacuation orders have been lifted. According to news reports, The threat of a catastrophic explosion has been completely ruled out. A structural crack that naturally formed in the upper portion of the tank over the weekend served as a crucial fail-safe, safely venting the excessive internal pressure and naturally cooling the internal chemical. This was the best outcome of the situation.

The crisis in Orange County, California, began involving a 34,000-gallon aboveground storage tank (AST) holding highly volatile methyl methacrylate (MMA) at the GKN Aerospace facility in Garden Grove.  

An overnight internal temperature spike caused the tank to over-pressurize and off-gas vapors. Emergency mitigation completely stalled because the tank's drainage and mechanical valves were not working and "gummed up," preventing responders from pumping out the chemical or injecting neutralizing stabilizers. Having started my environmental career in 1978 helping to create RCRA this makes me insane. The area was evacuated for days. And to try and lower the tank temperature, emergency crews used unmanned high-volume water cannons (which were dousing the tank with over 1,200 gallons of water per minute). Trying to stabilize the tank’s temperature.

History of the Tank and Facility

While GKN Aerospace has operated the facility on Western Avenue since 2004, the chemical storage tanks on-site have been present since at least 1972, meaning parts of the physical infrastructure are over 50 years old.

The facility uses MMA to manufacture specialized, high-performance acrylic windscreens for military fighter jets. MMA is highly reactive and prone to dangerous exothermic (heat-generating) polymerizing reactions if not carefully stored and kept below 77 degrees Fahrenheit.

Inspection and Violation History

California officials have openly attributed this crisis to a systemic failure of safety redundancies and poor equipment maintenance rather than simple age-related decay. The facility has a documented history of oversight failures. Reports on file indicate that the facility has incurred 10 OSHA violations, including a specific citation for failing to maintain manufacturing machinery according to the manufacturer’s instructions.

The operator, GKN Aerospace,  paid nearly $1 million to settle environmental violations, highlighting a pre-existing history of compliance issues regarding hazardous materials handling.

Aboveground Storage Tank (AST) Regulations in California

Above Ground Storage Tanks  (AST) are not properly regulated in the United States. California, with some of the strongest AST regulations maintains a bifurcated regulatory framework depending strictly on whether they hold petroleum or hazardous non-petroleum chemicals and only bothers with petroleum products.

California's Aboveground Petroleum Storage Act (APSA) strictly regulates facilities storing 1,320 gallons or more of petroleum products (such as diesel, gasoline, or crude oil). Because methyl methacrylate is an industrial solvent/monomer and not a petroleum product, it falls entirely outside of the regulation’s jurisdiction.

Industrial chemical ASTs are instead regulated under California's Hazardous Materials Release Response Plans and Inventory law. Facilities holding hazardous chemicals above threshold quantities (55 gallons for liquids) must submit Hazardous Material Business Plan to the local Certified Unified Program Agency (CUPA)—typically a county environmental health department or a large city fire department that locally enforces state environmental and emergency management laws. The primary purpose of an HMBP is to provide immediate, accurate information to first responders (like firefighters and hazmat teams) during an emergency, ensuring they know exactly what chemicals are inside a building before they enter.

Because MMA is highly reactive and flammable, facility infrastructure is bound by Cal/OSHA standards (Title 8, Section 5189). This legally mandates mechanical integrity programs, meaning the facility is required to routinely inspect, test, and maintain critical process components—including piping, relief valves, and cooling systems—to prevent catastrophic failures. Clearly, this did not happen appropriately for a tank that is believed to be over 50 years old.

Relying solely on general Hazardous Materials Business Plans allows chemical aboveground storage tanks (ASTs) to bypass some of the engineering and safety mandates applied to petroleum tanks. California and the rest of the nation needs Chemical AST Regulations.   Stealing profusely from the CA Aboveground Petroleum Storage Act, and with the help of AI to examine AST regulations across the land, this is what needs to be done in California and elsewhere:

1. Mandatory Secondary Containment

Every chemical AST must have a secondary containment system to isolate spills and prevent environmental contamination.

• Volumetric Capacity: Containment basins must hold 110% of the single largest tank's volume, plus additional capacity to hold a 25-year, 24-hour rainfall event for outdoor tanks.
• Material Impermeability: Liners and concrete basins must be chemically compatible with the stored substance. For reactive monomers like methyl methacrylate (MMA), containment must feature non-porous coatings to prevent absorption and chemical degradation.
• Separation Defenses: Impoundment areas must segregate incompatible chemicals. Acids, bases, and highly reactive monomers cannot share a drainage basin to avoid accidental mixing and violent exothermic reactions.

2. Risk-Based Lifespan and Age Limitations

Because physical infrastructure degrades over time, tanks must face stricter regulatory hurdles as they age.

• Design Life Cap: Implement a mandatory 50-year structural lifespan cap for high-risk chemical ASTs. Beyond 50 years, tanks must either undergo complete shell replacement or pass a rigorous, destructive metallurgical evaluation to clear them for 5-year extensions.
• Fitness-For-Service (FFS): After 20 years of service, operators must conduct an API 579 Fitness-For-Service assessment every 5 years to evaluate shell thinning, stress corrosion cracking, and structural fatigue.

3. Escalating Inspection Frequencies

Inspection intervals must automatically tighten as a tank ages, shifting from baseline tracking to aggressive preventative testing.

Tank Age	Internal Inspection Frequency	External Inspection Frequency	Mandatory Testing Scope
0 – 15 Years	Every 10 Years	Every 2 Years	Visual inspection, basic ultrasonic thickness (UT) spot checks.
16 – 30 Years	Every 5 Years	Annually	Full-floor UT scanning, weld seam magnetic particle testing.
31+ Years	Every 3 Years	Semi-annually	Advanced non-destructive testing (NDT), radiography of high-stress joints.

4. Critical Environment Controls (Cooling & Stabilization)

For volatile chemicals prone to runaway polymerization or thermal degradation, cooling systems must be regulated as essential and necessary safety systems.

• Redundant Cooling Loops: Facilities storing chemicals with critical runaway temperatures must utilize dual-independent cooling loops. If the primary refrigeration loop fails, a secondary, mechanically isolated backup loop must activate automatically.
• Emergency Inhibitor Injection: Tanks holding self-reacting monomers must feature an automated, gravity-fed inhibitor injection system. This system must be capable of flooding the tank with stabilizing chemicals within 15 minutes of a runaway heat spike, operating independently of municipal power or manual valves.
• Uninterruptible Power (UPS): Cooling systems, internal temperature probes, and pressure sensors must be hardwired to an on-site, fail-safe backup generator capable of running isolated for a minimum of 72 hours.

5. Vapor Space Management (Moisture & Oxygen Control)

Chemicals that react violently with ambient moisture or require specific oxygen levels to remain stable require active blanket gas regulation.

• Automated Nitrogen Blanketing: For water-reactive or highly flammable chemicals, a positive-pressure nitrogen (or inert gas) blanket system must be mandatory to displace oxygen and humidity.
• Controlled Oxygenation: Some chemicals, like MMA, actually require a precise, low level of dissolved oxygen (typically 20–50 ppm) to keep their stabilizing inhibitors active. Regulations must mandate continuous oxygen-sparging monitoring systems with automated alarms if oxygen levels dip below safe stabilization thresholds.
• Dual-Stage Desiccant Breathers: Any atmospheric venting lines must be equipped with redundant, color-indicating desiccant air breathers to strip 100% of moisture from incoming air during tank drawdown.

6. Valve and Piping Mechanical Integrity

To prevent responders from being locked out during a crisis, mechanical isolation points must be explicitly regulated.

• Quarterly Exercise Mandate: All critical emergency isolation, drainage, and dump valves must be mechanically cycled (exercised) every 90 days to ensure they do not seize or gum up from chemical residue. Logs must be digitally submitted to regulators.
• Fail-Safe Fire Valves: All bottom-outlet lines must feature fire-safe, API 607 certified emergency shutdown valves (ESVs) that automatically close via spring-return mechanisms if external ambient temperatures spike due to a fire.

We no longer live in the 1970’s and are perfectly capable of building and maintaining equipment that meets these standards. Do it.