HAZWOPER Decontamination Procedures & PPE Usage 2 — Questions and Answers
Question 1: Which decontamination method uses a chemical reaction to neutralize or destroy a contaminant rather than simply removing it?
- Physical removal
- Chemical decontamination (Correct answer)
- Dilution decontamination
- Encapsulation
Correct answer: Chemical decontamination
Chemical decontamination uses reactions such as neutralization, oxidation, or disinfection to destroy or detoxify the contaminant rather than just relocating it.
Question 2: When setting up a decontamination corridor, what is the correct flow of personnel movement?
- Hot zone to cold zone, bypassing warm zone
- Cold zone to warm zone to hot zone
- Hot zone through warm zone to cold zone (Correct answer)
- Warm zone directly to cold zone only
Correct answer: Hot zone through warm zone to cold zone
Personnel must move from the hot zone through the warm zone (where decontamination occurs) before entering the clean cold zone, preventing contaminant spread.
Question 3: Under OSHA 1910.120, who is ultimately responsible for ensuring that proper decontamination procedures are followed at a hazardous waste site?
- The site safety officer
- The incident commander
- The employer (Correct answer)
- The decontamination team leader
Correct answer: The employer
OSHA 1910.120 places ultimate responsibility on the employer to develop and implement a decontamination procedure as part of the site safety and health plan.
Question 4: What is the primary purpose of a 'buddy system' during hazardous waste operations involving PPE?
- To reduce the number of personnel needed on site
- To monitor each other for signs of heat stress or PPE failure (Correct answer)
- To share decontamination supplies between two workers
- To allow one worker to rest while the other works
Correct answer: To monitor each other for signs of heat stress or PPE failure
The buddy system ensures that workers can monitor each other for symptoms of chemical exposure, heat stress, PPE breaches, and other emergencies that workers cannot self-detect.
Question 5: Which of the following best describes 'gross decontamination'?
- Complete removal of all traces of contamination from PPE
- The initial rapid removal of heavy contamination before formal decon procedures (Correct answer)
- Decontamination of heavily contaminated soil before excavation
- Chemical neutralization of corrosive substances on skin
Correct answer: The initial rapid removal of heavy contamination before formal decon procedures
Gross decontamination is the first rapid step to remove bulk or heavy contamination, typically using large volumes of water, before more thorough decon procedures are applied.
Question 6: A worker exits the hot zone with Level B PPE. During decontamination, the outer suit shows visible contamination. What should happen to the suit after decontamination?
- Returned to inventory after drying
- Reused if the decon solution showed no reaction
- Discarded as potentially contaminated waste (Correct answer)
- Rinsed again and stored for later inspection
Correct answer: Discarded as potentially contaminated waste
PPE that was visibly contaminated should be treated as hazardous waste and properly disposed of in accordance with site hazardous waste procedures rather than reused.
Question 7: What does 'IDLH' stand for, and why is it critical to PPE selection decisions?
- Immediately Dangerous to Life or Health; defines the concentration requiring highest-level respiratory protection (Correct answer)
- Individually Determined Limit for Hazards; sets worker exposure thresholds per person
- Internal Detection Level for Hazardous materials; triggers air monitoring alerts
- Integrated Dose Limit for Health; establishes cumulative exposure limits
Correct answer: Immediately Dangerous to Life or Health; defines the concentration requiring highest-level respiratory protection
IDLH (Immediately Dangerous to Life or Health) defines concentrations at which a 30-minute exposure could cause death or irreversible health effects, requiring supplied-air respirators or SCBA.
HAZWOPER Decontamination Procedures & PPE Usage 2
Which decontamination method uses a chemical reaction to neutralize or destroy a contaminant rather than simply removing it?