AirSprayTech Academy Certificate Program

Secondary Containment Coating Systems for Industrial Contractors

Article 22 of 24

Spill Response, Decontamination, and Return to Service

Safely removing a release, evaluating the exposed lining, and determining when the containment area can be used again

Containment Creates Time to Respond

A secondary containment system is intended to control a release long enough for trained personnel to respond. It does not make the spilled material harmless, eliminate reporting requirements, or guarantee that the lining can tolerate unlimited exposure.

The priorities are to protect people, stop the release when it can be done safely, keep the material within the designated containment area, notify the required personnel, recover the material, decontaminate the area, inspect the lining, complete necessary repairs, and obtain authorization before returning the system to service.

Learning Objectives

After completing this article, the reader should be able to:

• Explain the contractor’s role during a chemical or oil release.
• Recognize the difference between an incidental release and an emergency response.
• Identify information required before entering or cleaning a contaminated containment area.
• Explain how improper cleanup methods can damage a containment lining.
• Evaluate the lining after chemical exposure and decontamination.
• Identify the conditions required before the containment system returns to service.

Contractors Are Not Automatically Emergency Responders

A coating contractor should not enter a spill area or attempt cleanup merely because the crew has protective clothing, respirators, pumps, or pressure-washing equipment. Emergency response requires the appropriate organization, training, medical qualification, personal protective equipment, monitoring, supervision, and written procedures.

The facility must determine who is authorized to respond. Contractors who have not been trained and assigned to the response organization should withdraw to a safe location, protect their personnel, and follow the facility emergency plan.

Incidental Release or Emergency Response?

An incidental release is generally a limited release that presents no significant safety or health hazard and can be safely controlled by employees in the immediate area using available equipment and established procedures.

Conditions that may indicate an emergency response include:

• An unknown substance or unknown concentration.
• A release that cannot be safely controlled at its source.
• A toxic, corrosive, flammable, reactive, oxygen-displacing, or otherwise dangerous atmosphere.
• The need to evacuate personnel from the immediate area.
• A release requiring specialized protective equipment or trained emergency responders.
• The possibility of fire, explosion, uncontrolled reaction, or dangerous vapor generation.
• Material escaping or threatening to escape the containment area.
• A condition that exceeds the facility’s established incidental-release procedures.

The facility’s emergency action plan or emergency response plan—not an individual worker’s judgment—should establish the response organization and required actions.

Immediate Priorities

1. Protect people. Warn others, restrict access, and evacuate when required.
2. Notify the facility. Activate the required alarm, communication, and reporting procedures.
3. Identify the material. Obtain the product identity and current safety data sheet.
4. Stop the source only when safe. Shut a valve, stop a pump, or reposition a container only when authorized and properly protected.
5. Protect pathways. Prevent entry into drains, soil, waterways, occupied spaces, or incompatible containment zones.
6. Preserve information. Record the product, estimated quantity, source, time, affected area, and response actions.

Information Required Before Cleanup

Before personnel enter the containment area or select a cleanup method, determine:

• The exact chemical or product identity.
• Concentration, temperature, quantity, and physical state.
• Whether multiple released materials may react with one another.
• The hazards identified in the safety data sheet.
• Required ventilation, atmospheric monitoring, and personal protective equipment.
• The lining manufacturer and exact installed system.
• The lining’s resistance to the spilled material at the actual concentration and temperature.
• The length of time the lining has been exposed.
• Approved absorbents, pumps, cleaners, neutralizers, and rinse methods.
• Waste characterization, collection, labeling, storage, transportation, and disposal requirements.
• Required internal and regulatory notifications.

Control Drains and Other Escape Paths

Containment drains, valves, sumps, penetrations, pipe sleeves, joints, and transitions should be evaluated immediately. A drain intended for rainwater removal may become a direct release path if it remains open during a spill.

Drain valves should remain secured and controlled in accordance with the facility plan. Liquid should not be discharged merely because it appears clean. Sampling, authorization, treatment, or off-site disposal may be required.

Temporary plugs, covers, booms, socks, or other diversion measures must be chemically compatible with the released material and installed only by trained, authorized personnel.

Recover the Bulk Liquid First

Whenever practical, remove recoverable bulk liquid before using absorbents or wash water. This reduces the volume of contaminated waste and limits the time the lining remains exposed.

Recovery equipment may include:

• Chemically compatible pumps and hoses.
• Vacuum equipment designed and approved for the material and atmosphere.
• Compatible recovery tanks, drums, or portable containers.
• Squeegees, dikes, booms, and collection tools.
• Absorbents selected for the specific chemical.

Ordinary shop vacuums, electrical equipment, pumps, tools, and vehicles may create ignition, electrical, reaction, or contamination hazards. Equipment must be appropriate for the substance and classified work area.

Never Neutralize a Spill by Guesswork

Neutralization can produce heat, splashing, boiling, toxic gas, or a more difficult waste stream. Adding water can also increase the reaction rate or spread contamination over a larger area.

Neutralization should be performed only under an approved written procedure by properly trained personnel using compatible materials, controlled addition rates, monitoring, and appropriate personal protective equipment. The effect of the neutralizer on the containment lining must also be considered.

Decontamination Is a Planned Process

Decontamination removes or reduces hazardous material from personnel, tools, equipment, and surfaces. The method must be suitable for the contaminant and must not drive it deeper into the lining or substrate.

A typical surface-decontamination sequence may include:

1. Remove bulk liquid using compatible recovery equipment.
2. Collect remaining liquid with compatible absorbents or vacuum equipment.
3. Remove contaminated solids, residue, and disposable materials.
4. Apply an approved cleaning or neutralization agent when required.
5. Agitate using tools that will not unnecessarily damage the lining.
6. Recover all wash and rinse liquid.
7. Repeat cleaning until the established endpoint is achieved.
8. Verify decontamination by the specified inspection, sampling, or analytical method.
9. Manage all recovered material as the appropriate waste.

Cleanup Methods Can Damage the Lining

A lining that survived the original spill can be damaged during cleanup. Potentially harmful methods include:

• Using an incompatible solvent or concentrated cleaner.
• Allowing cleaning chemicals to remain on the surface too long.
• Applying hot water or steam beyond the system’s temperature resistance.
• Using excessive pressure that cuts, lifts, or injects liquid beneath the lining.
• Aggressive scraping or abrasive tools that remove lining thickness.
• Flooding joints, cracks, terminations, or existing defects.
• Mixing incompatible waste streams during recovery.
• Allowing contaminated rinse water to enter an uncontrolled drain.

Obtain the lining manufacturer’s written cleaning recommendations whenever possible. A small controlled test area may be appropriate before applying a cleaner or method throughout the containment area.

Personnel and Equipment Decontamination

The decontamination plan should identify the sequence for leaving the contaminated area, the location and arrangement of decontamination stations, required wash and rinse solutions, handling of reusable equipment, removal of personal protective equipment, and collection of contaminated water and disposable materials.

Personnel should move from the contaminated zone toward cleaner areas through a controlled route. Contaminated clothing, gloves, respirators, tools, hoses, pumps, and monitoring instruments should not be carried into clean vehicles, offices, break areas, or homes.

Equipment should be decontaminated according to its manufacturer’s instructions and the facility plan. Items that cannot be effectively decontaminated may require disposal.

Decontaminated Does Not Automatically Mean Undamaged

A surface may be clean enough for inspection while the lining remains softened, swollen, permeated, stained, cracked, blistered, or delaminated. Decontamination removes hazardous residue; it does not prove that the lining has retained its protective properties.

Post-Spill Lining Evaluation

After decontamination and safe access have been confirmed, inspect the entire exposed area, including walls, floors, coves, joints, drains, penetrations, seams, terminations, and previously repaired locations.

Look for:

• Softening, swelling, tackiness, wrinkling, or loss of hardness.
• Blistering, bubbling, delamination, or loss of adhesion.
• Cracking, checking, embrittlement, or erosion.
• Pinholes, holidays, exposed substrate, or open seams.
• Discoloration, staining, gloss change, or surface etching.
• Corrosion staining or deterioration of steel.
• Concrete deterioration, cracking, spalling, or chemical attack.
• Damage caused by pumps, hoses, scraping, pressure washing, traffic, or recovery equipment.
• Residual contamination at joints, drains, penetrations, and low points.

Compare the Exposure With the Chemical-Resistance Data

Identify the exact lining system, installed thickness, cure condition at the time of exposure, chemical identity, concentration, temperature, and contact duration. Mixtures and contaminants must be considered rather than evaluating only the product’s primary ingredient.

Manufacturer chemical-resistance information may use terms such as continuous immersion, intermittent exposure, splash and spill, fumes, or secondary containment. These categories are not interchangeable.

A lining recommended for brief splash exposure may not tolerate several days of ponding. Obtain written manufacturer guidance when the exposure exceeded the published conditions or when continued performance is uncertain.

Inspection and Testing After a Spill

Depending on the system and exposure, the evaluation may include:

• Detailed visual examination and photographic mapping.
• Comparison with an unexposed area or retained reference sample.
• Hardness or cure evaluation using an approved method.
• Dry-film or total-system thickness measurements.
• Holiday testing where appropriate.
• Pull-off adhesion testing at approved locations.
• Sampling and laboratory examination of the lining.
• Concrete or steel substrate evaluation.
• Verification that joints, drains, penetrations, and terminations remain functional.

Testing should be selected with the owner, specifier, lining manufacturer, and qualified inspector. Destructive testing requires approved locations and a written repair procedure.

Repairing Spill Damage

Damaged or chemically degraded material must be removed until sound lining and sound substrate are reached. Staining alone may be cosmetic, but softness, swelling, loss of adhesion, cracking, permeation, or substrate attack may require partial or complete removal.

The repair procedure should address decontamination, removal, surface preparation, treatment of the exposed substrate, compatibility with the existing system, overlap into sound lining, required thickness, reinforcement, environmental conditions, cure, inspection, and retesting.

A new coating should not be applied over absorbed chemicals, contaminated surfaces, softened lining, or material with uncertain adhesion. Covering the condition can hide damage without restoring containment performance.

Requirements for Return to Service

The containment area should not return to service until the authorized parties confirm that:

• The release source has been identified and corrected.
• Required notifications and response actions have been completed.
• Bulk material, residue, contaminated absorbents, and rinse water have been removed.
• The area has been decontaminated to the established endpoint.
• Atmospheric and entry hazards have been controlled.
• The lining and substrate have been inspected and evaluated.
• Required repairs have been completed, cured, inspected, and tested.
• Drains, valves, joints, sumps, penetrations, and other containment features are functional.
• The lining manufacturer’s exposure and return-to-service requirements have been satisfied.
• Waste has been properly characterized, labeled, stored, transported, or disposed of.
• The incident, inspection, repair, and test records are complete.
• The responsible facility representative has provided authorization for return to service.

Incident Documentation

The final incident record should document:

• Date, time, location, source, and cause of the release.
• Material identity, concentration, temperature, and estimated quantity.
• Areas and environmental media affected.
• Notifications, response actions, and personnel involved.
• Recovery, cleaning, neutralization, and decontamination methods.
• Waste quantities, containers, profiles, manifests, and disposal records.
• Photographs and drawings showing exposure and damage.
• Inspection, sampling, and testing results.
• Repair materials, batch numbers, application records, and cure conditions.
• Final test results and acceptance documentation.
• Corrective actions intended to prevent recurrence.

Learn From the Release

A spill provides information about the facility’s prevention, response, containment, inspection, and maintenance programs. The post-incident review should examine why the release occurred, how quickly it was detected, whether the containment performed as intended, and whether responders had the correct equipment and information.

Corrective action may involve equipment repair, improved alarms, drain controls, revised inspection frequency, updated response procedures, additional training, better spill kits, modified chemical storage, or upgrading the lining system.

Key Takeaways

• Secondary containment creates response time; it does not eliminate the chemical hazard.
• Coating contractors are not automatically qualified or authorized emergency responders.
• Identify the material, hazards, exposure conditions, and installed lining before selecting a cleanup method.
• Recover bulk liquid before using large quantities of absorbent or wash water when practical.
• Never neutralize a chemical spill by guesswork.
• Cleanup chemicals, pressure, heat, and mechanical tools can damage a lining that survived the spill.
• Decontamination does not prove that the lining remains undamaged.
• Inspect, test, repair, and document the lining after exposure.
• Return to service requires formal authorization—not simply completion of cleanup.

Technical and Regulatory References

Regulations and technical requirements vary by facility, material, location, and operation. Consult the current requirements that apply to the actual work.

• OSHA 29 CFR 1910.120 — Hazardous Waste Operations and Emergency Response
• OSHA — Hazardous Waste Decontamination Guidance
• 40 CFR 112.7 — General Requirements for Spill Prevention, Control, and Countermeasure Plans
• 40 CFR Part 112 — Oil Pollution Prevention
• U.S. EPA — Secondary Containment Under the SPCC Regulation

Professional responsibility: Spill response and decontamination can involve toxic, corrosive, flammable, reactive, oxygen-deficient, and environmentally regulated materials. Follow the facility emergency plan, current safety data sheets, OSHA requirements, environmental regulations, waste-management requirements, lining manufacturer instructions, and directions from the responsible emergency coordinator. Do not enter, clean, test, or repair a contaminated area without proper authorization, training, hazard assessment, protective equipment, and confirmation that the work can be performed safely.

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