8.2 Equipment Decon and Runoff Control
Key Takeaways
- OSHA 1910.120(k)(2)(iii) and (k)(4) require employees leaving a contaminated area to be decontaminated, and require contaminated clothing, equipment, and the solvents used for decon themselves to be decontaminated or disposed of properly.
- Gross-decon tools, hose, instruments, stretchers, and apparatus on the dirty side of the warm zone; bag what will not be cleaned in place; keep dedicated dirty versus clean sides so a “clean” meter does not ride in a dirty tote.
- Runoff is a hazardous-waste and environmental problem — dikes, portable pools, and storm-drain protection matter — but life safety of victims beats environmental purity during emergency and mass decon. Do not skip flushing a contaminated child because of a drain.
- After the emergency, the incident commander and technician document runoff and coordinate with environmental authorities. OSHA 1910.120(q)(3)(ix) requires the IC to implement appropriate decontamination procedures after emergency operations terminate.
- Radioactive particles: avoid high-pressure streams that aerosolize; survey with instruments. Biological: disinfect after gross physical removal. Do not dunk electronics unless the manufacturer says they can take it.
Mass decon in 8.1 is the crowd. This section is everything the crowd, the entry team, and the corridor leave behind: wrenches, hose, photoionization detectors (PIDs), four-gas meters, stretchers, backboards, engine running boards, and the water that ran off the parking lot. OSHA 1910.120(k) is titled Decontamination. Emergency-response employers also owe decontamination procedures in the emergency response plan under 1910.120(q)(2)(vii), and 1910.120(q)(3)(ix) is blunt: after emergency operations have terminated, the incident commander shall implement appropriate decontamination procedures. You do not “forget the tools” because the leak is patched.
OSHA’s decontamination definition again: remove hazardous substances from employees and their equipment to the extent necessary to preclude foreseeable adverse health effects. Equipment is in the definition. A chlorine-kit wrench that rides in a medic’s cab is a mobile release.
OSHA 1910.120(k) — the equipment rules you can quote
(k)(1) Procedures for all phases of decontamination shall be developed and implemented.
(k)(2)(i) A decontamination procedure shall be developed, communicated to employees, and implemented before any employees or equipment may enter areas where potential for exposure exists. The corridor is not an afterthought you invent at the manway.
(k)(2)(ii) Standard operating procedures shall minimize employee contact with hazardous substances or with equipment that has contacted hazardous substances. That is the dirty-side / clean-side rule in regulatory English.
(k)(2)(iii) All employees leaving a contaminated area shall be appropriately decontaminated; all contaminated clothing and equipment leaving a contaminated area shall be appropriately disposed of or decontaminated.
(k)(3) Location: decontamination shall be performed in geographical areas that minimize exposure of uncontaminated employees or equipment to contaminated employees or equipment. The technical and mass-decon corridors live in the warm zone for this reason.
(k)(4) All equipment and solvents used for decontamination shall be decontaminated or disposed of properly. The wash brush and the detergent solution are waste streams, not “clean because they were the cleaners.”
(k)(5)(i) Protective clothing and equipment shall be decontaminated, cleaned, laundered, maintained, or replaced as needed to maintain effectiveness.
(k)(5)(ii) Employees whose non-impermeable clothing becomes wetted with hazardous substances shall immediately remove that clothing and proceed to shower. The clothing shall be disposed of or decontaminated before it is removed from the work zone. That sentence is why 8.1 would not let civilians walk home in a product-soaked hoodie, and why you do not send structural PPE to someone’s washing machine.
(k)(6) Unauthorized employees shall not remove protective clothing or equipment from change rooms. (k)(7) Commercial laundries must be informed of the potentially harmful effects. Do not take contaminated PPE home.
Tools, instruments, apparatus, stretchers — dirty side versus clean side
Treat the warm zone as two halves. The dirty (hot-facing) end is where gross product comes off. The clean (cold-facing) end is where decontaminated people and objects may pass. A tote that held dirty tools does not become a clean tote because someone moved it ten feet.
| Item | Typical technician practice | Common failure |
|---|---|---|
| Hand tools (plugs, patches, chlorine-kit wrenches, hammers) | Gross rinse or wash at a tool-drop / tool-wash station on the dirty side; inspect; bag if still suspect or if they will leave the site | Riding in a coat pocket onto the clean end, then into the cab |
| Hose and nozzles used in the corridor | Flush, drain, and treat as contaminated until the AHJ says otherwise; do not reload a “clean” bed with corridor hose | Packing wet, product-smelling hose on the engine and driving to quarters |
| Monitoring instruments | Wipe per the manufacturer and the SOP; bag; survey; do not dunk a PID or four-gas in a solvent drum unless that instrument is built for immersion | “It got wet in decon so it must be clean,” or solvent-bathing electronics |
| Stretchers / backboards | Dedicated dirty stretchers stay on the dirty side; transfer the patient to a clean stretcher at the clean-side handoff | One stretcher that makes every ambulance trip and contaminates three hospitals |
| Apparatus | Gross rinse of running boards, pumps, and body in the warm zone before the rig returns to quarters or to a hospital ramp | Driving a contaminated engine to the emergency department as if it were a taxi |
Bagging is how you isolate what you cannot finish washing on scene: evidence, heavily soaked clothing, tools awaiting a better method, and instruments that need a shop wipe. Bags are labeled. They do not sit on the clean-side rehab table.
Gross decon of tools happens in the warm zone while the wearer is still on air if the tools came out of the hot zone with the entry team. That is the same logic as 6.2 doffing: the chlorine-kit wrench does not ride into the clean end on a glove that is about to come off.
Runoff: real waste, not a reason to let a child stay contaminated
Mass-decon water that has touched product is a hazardous-waste / environmental problem. It can enter storm drains, creeks, and publicly owned treatment works. Good practice — dikes, dirt or sand berms, inflatable pools under shower trails, drain covers, diversion to a low point that is not a living stream — is part of the technician’s job when you can do it without delaying life-saving flush.
Life safety of victims beats environmental purity during emergency and mass decon. Do not skip flushing a contaminated child because a storm drain is uncovered. Do not hold eighty symptomatic people in a chlorine cloud while public works delivers a vacuum truck. OSHA’s decontamination definition is about foreseeable adverse health effects on people. Environmental statutes still apply, and you will answer for the puddle — after the people are not dying.
After the emergency, the incident commander (IC) and the technician document where runoff went, about how much, what product was in it, and what you did to control it. Coordinate with environmental authorities: local public works, the state environmental agency, the U.S. Environmental Protection Agency (EPA) on a larger release, the U.S. Coast Guard on waterways. That is (q)(3)(ix) meeting (k)(4). Collected wash water and spent solvents become a waste-determination problem for the environmental unit, not a “dump it in the grass, we are done” problem.
If temperature or water supply makes wet decon ineffective, (k)(8) again: other effective means for cleansing shall be provided. Dry methods still generate contaminated clothing and wipes that must be bagged and disposed of or decontaminated.
Radiological and biological equipment — do not use the chemical playbook blindly
Radioactive particles on tools, suits, or skin are not “washed into harmlessness” by a fire stream. High-pressure water aerosolizes particles, puts them in the air you and the next patient breathe, and spreads the contamination footprint. Use controlled rinse or other AHJ-approved methods, then survey with radiological instruments (count-rate / contamination probes on surfaces; do not declare a wrench clean because it looks shiny). If the meter still clicks above the AHJ release criterion, it is not clean. Bag it, isolate it, and get a radiation authority. Wetting can also drive contamination into pores and seams, which is why “more pressure” is the wrong instinct.
Biological contamination is often not visible. Gross physical removal (soap, water, wiping) comes first; disinfection with an EPA-registered disinfectant appropriate to the organism, with the required contact time, comes after. Disinfectant sprayed on a cake of soil does not reach the organism. Do not bleach a PID. Do not assume a 30-second hose blast is a hospital autoclave.
Chemical tools follow the product: a water-soluble irritant rinses; an oil-soluble pesticide may need a selected surfactant from the technical-decon plan (Chapter 7 methods). Whatever solution you used is (k)(4) waste.
Scenario: tools, a stretcher, and a parking-lot drain
Two technicians exit a pesticide-drum overpack. Wrenches and a drum pump go into the tool wash at the dirty end; a PID is wiped and bagged, not dunked. The nonambulatory farmer came out on a dirty stretcher; at the clean-side handoff he moves to a clean stretcher bound for the ambulance. Corridor water is running toward a storm drain. A parent is trying to carry a soaked child around the corridor “so we don’t pollute the drain.” The technician’s order is: the child goes through the water now. Someone covers what they can of the drain and throws a quick berm, but the child is not held in product for the environment. After the last victim, the IC photographs the runoff path, estimates volume, notifies public works and the state environmental duty officer, and keeps the dirty hose and totes out of quarters until they are washed or disposed of. That is equipment decon and runoff control in one incident: (k) during the work, (q)(3)(ix) when the emergency is over, people first, paperwork and environmental coordination immediately after.
If a test item says OSHA forbids any mass-decon water because runoff is waste, reject it. If it says take the suit home to launder, reject it. If it says blast radioactive particles with a straight stream until the wand is quiet, reject it.
During mass decontamination, a contaminated child is standing over an uncovered storm drain. Environmental staff want the flush delayed until a catch basin arrives. What is the correct technician priority?
A technician must decontaminate tools and a suit after a suspected radioactive particulate release. Which method is correct?
Under OSHA 1910.120(k), what must happen to contaminated tools, clothing, and the solvents used to wash them when they leave a contaminated area?