Free practice quiz · 15 questions

HAZWOPER 40 Hour Practice Test

Answer every question, then press Check my answers to see your score and an explanation for each one. Study first with the guide: What Is HAZWOPER? The Complete Guide to OSHA 29 CFR 1910.120.

1. What does HAZWOPER stand for?

Answer: Hazardous Waste Operations and Emergency Response. HAZWOPER is Hazardous Waste Operations and Emergency Response, OSHA 29 CFR 1910.120.

2. How much supervised field experience does a 40-hour general site worker need?

Answer: 3 days. 1910.120(e)(3)(i) requires 40 hours of off-site instruction plus at least 3 days of actual field experience under a trained, experienced supervisor.

3. How often is HAZWOPER refresher training required?

Answer: Every year. 1910.120(e)(8) requires 8 hours of refresher training annually.

4. Which PPE level gives the highest level of skin, eye and respiratory protection?

Answer: Level A. Level A combines SCBA or supplied air with a totally encapsulating, vapor-tight suit.

5. Below what oxygen concentration is an atmosphere considered oxygen deficient?

Answer: 19.5%. OSHA defines oxygen deficient as less than 19.5% oxygen by volume. Normal air is about 20.9%.

6. In which work zone does decontamination take place?

Answer: Contamination reduction zone. The decon line sits in the contamination reduction zone (warm zone), between the exclusion and support zones.

7. Where should the support zone be located?

Answer: Upwind of the exclusion zone. The support zone is clean and placed upwind so vapors and dust drift away from it.

8. Which PPE level uses an air-purifying respirator?

Answer: Level C. Level C uses an air-purifying respirator, allowed only when contaminants are known and APR criteria are met.

9. What is the buddy system?

Answer: Workers are organized so each is observed by at least one other worker. Under 1910.120(a)(3), the buddy system organizes employees so each one is observed by at least one other in the group.

10. How many additional hours of training do on-site supervisors need beyond worker training?

Answer: 8 hours. 1910.120(e)(4) requires at least 8 additional hours of specialized training for managers and supervisors.

11. Which of these must be in the site-specific safety and health plan?

Answer: Decontamination procedures. Decontamination procedures are one of the required HASP elements in 1910.120(b)(4)(ii).

12. A combustible gas reading above what percentage of the LEL commonly means workers should withdraw?

Answer: 25%. Common EPA guidance treats readings above 25% LEL as an explosion hazard requiring withdrawal. Your site plan sets the exact action levels.

13. Medical surveillance is required for employees who wear a respirator for how many days or more per year?

Answer: 30. 1910.120(f)(2) covers employees who wear respirators 30 days or more a year, among other groups.

14. What is the most common route of exposure at hazardous waste sites?

Answer: Inhalation. Inhalation of gases, vapors, mists and dusts is the most common route of exposure.

15. What does IDLH stand for?

Answer: Immediately Dangerous to Life or Health. IDLH is Immediately Dangerous to Life or Health. Only atmosphere-supplying respirators are used at or above IDLH.

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