HAZWOPER 40-Hour

Exam blueprint

Sourced from OSHA 29 CFR 1910.120 — Hazardous Waste Operations and Emergency Response

• Regulatory framework + scope10%
• Hazard recognition + toxicology basics15%
• Site-specific Health & Safety Plan (HASP)10%
• Air monitoring + sampling15%
• PPE — Levels A/B/C/D + selection15%
• Decontamination procedures10%
• Medical surveillance5%
• Emergency response + ICS10%
• Confined-space entry within HAZWOPER5%
• Drum + container handling5%

1. 01Regulatory framework + scope

   ~90min

   Which workers HAZWOPER covers, the difference between paragraph (e) cleanup workers, paragraph (p) RCRA TSDF workers, and paragraph (q) emergency responders, and how the 40-hour training fits into the larger compliance picture.

   • The three HAZWOPER paragraphs (e), (p), (q)

     HAZWOPER applies to three distinct populations: (e) workers at uncontrolled hazardous-waste cleanup sites — they need the 40-hour training; (p) workers at TSDF (treatment, storage, disposal) facilities operating under RCRA — they need 24 hours; (q) emergency responders to releases of hazardous substances — five tiers from Awareness through Incident Commander. Knowing which paragraph governs your site determines which training applies.

     Reference: 29 CFR 1910.120(a)(1) · read the standard ↗

   • 40-hour off-site training + 24-hour on-site supervision

     Paragraph (e)(3) requires 40 hours of initial off-site training PLUS a minimum of 24 hours of actual field experience under direct supervision of a trained, experienced supervisor BEFORE the worker is allowed to work unsupervised. Workers who only enter the site occasionally and are unlikely to be exposed above PELs may receive 24 hours of off-site instead. Annual 8-hour refresher training is required forever after.

     Reference: 29 CFR 1910.120(e)(3)

   • Recognition of prior training

     If a worker's prior employer documented equivalent HAZWOPER training within the past 12 months, the new employer is not required to repeat the 40-hour training, but must verify equivalency in writing. This is rare in practice — most employers re-train to control liability.

   Practice questions (2)

   1. 1. A worker is being assigned to a Superfund cleanup site for the first time. What training does OSHA require BEFORE the worker can perform unsupervised cleanup work?

      • A.40 hours off-site training only
      • B.40 hours off-site + 24 hours on-site supervised experience✓ correct
      • C.24 hours off-site + 8 hours refresher
      • D.Whatever the employer decides is appropriate

      Paragraph (e)(3) requires BOTH the 40-hour off-site classroom AND 24 hours of supervised on-site experience before the worker is permitted to work without direct supervision. Many candidates miss the 24-hour on-site requirement.

   2. 2. A facility operates under a RCRA permit treating hazardous waste. Which HAZWOPER paragraph governs its workers?

      • A.(e)
      • B.(p)✓ correct
      • C.(q)
      • D.(b)

      Paragraph (p) covers TSDF (treatment, storage, disposal facility) workers operating under RCRA. Paragraph (e) covers uncontrolled cleanup sites; paragraph (q) covers emergency responders. The TSDF training requirement is 24 hours, not 40.

2. 02PPE — Levels A, B, C, D

   ~75min

   How OSHA classifies chemical-protective ensembles into four levels and when each is appropriate. Level A is total encapsulation; Level D is essentially street clothes.

   • Level A — maximum protection

     Level A is required when the highest level of skin, eye, and respiratory protection is needed: when the contaminant is unknown or known to be highly toxic or skin-absorbable, when working in an oxygen-deficient atmosphere, or when concentrations exceed IDLH. Components: positive-pressure SCBA (or SAR with escape SCBA), totally-encapsulating chemical-protective suit, inner and outer chemical-resistant gloves, chemical-resistant boots.

     Reference: 29 CFR 1910.120(g)(3) + Appendix B

   • Level B — same respiratory, lower skin

     Level B uses the same maximum respiratory protection as Level A (positive-pressure SCBA or SAR) but a non-encapsulating chemical-resistant suit. Used when the atmosphere is dangerous but the contaminant is NOT known to be highly skin-toxic, or when work involves dipping/splashing rather than total submersion.

     Reference: 29 CFR 1910.120(g)(3) + Appendix B

   • Level C — air-purifying respirator

     Level C uses an air-purifying respirator (APR) with chemical-resistant clothing. Permitted only when: the contaminant is known and present at less than IDLH, the air contains at least 19.5% oxygen, the APR cartridge is appropriate for the contaminant, AND continuous air monitoring confirms exposure stays below safe limits. NEVER acceptable for unknown atmospheres.

   • Level D — work uniform with no respiratory protection

     Level D is a basic work uniform — coveralls, gloves, boots, hard hat, safety glasses — providing no respiratory protection and minimal skin protection. Acceptable ONLY when the atmosphere contains no known hazards and the work precludes splashes, immersion, or unexpected inhalation.

   Practice questions (2)

   1. 1. A site has unidentified drums leaking a viscous yellow liquid with strong odor. Initial entry PPE level?

      • A.Level A✓ correct
      • B.Level B
      • C.Level C
      • D.Level D

      When the contaminant is unknown, OSHA requires the maximum level of skin and respiratory protection until characterization shows lower is acceptable. Level A — totally-encapsulating suit + SCBA — is the answer for unknown atmospheres. Once characterization rules out skin absorption and IDLH, you can step down to B or C.

   2. 2. Which Level requires an air-purifying respirator (APR) and is NEVER acceptable for unknown atmospheres?

      • A.Level A
      • B.Level B
      • C.Level C✓ correct
      • D.Level D

      Level C uses an APR (cartridge respirator) which only works if the contaminant is identified, the cartridge is rated for it, and oxygen is at least 19.5%. None of those can be confirmed in an unknown atmosphere — so Level C is never the entry level for an uncharacterized site.

3. 03Decontamination procedures

   ~60min

   How to remove contaminants from workers, equipment, and PPE before they leave the exclusion zone. The contamination reduction zone (CRZ) and the standard 9-station decon line.

   • Site control: exclusion / contamination reduction / support zones

     Every HAZWOPER site is divided into three zones: the EXCLUSION ZONE (or hot zone) where contamination exists; the CONTAMINATION REDUCTION ZONE (CRZ, or warm zone) where decontamination occurs; and the SUPPORT ZONE (cold zone) which is uncontaminated. Workers transit between zones only at controlled access points, and the decon line lives at the EZ/CRZ boundary.

     Reference: 29 CFR 1910.120(j)

   • The standard decon line — Level B example

     A Level-B decon line typically runs through 9 stations: (1) segregated equipment drop, (2) outer-glove + boot wash, (3) outer-glove + boot rinse, (4) tape removal, (5) outer glove removal, (6) suit + boot removal, (7) SCBA removal, (8) inner glove removal, (9) personal hygiene + medical monitoring. Each station has a specific function — workers move from "more contaminated" toward "clean" only.

   Practice questions (1)

   1. 1. A worker exits the exclusion zone in Level B PPE. In what order do they remove the SCBA and the chemical suit during decon?

      • A.SCBA first, then suit
      • B.Suit first, then SCBA✓ correct
      • C.Either order is fine
      • D.Both at the same time to save time

      Suit comes off BEFORE the SCBA. Removing the SCBA first would expose the worker's face/airway to whatever contamination is on the outside of the suit. The standard 9-station decon line specifically sequences suit removal at station 6, SCBA at station 7.

External resources

• Official
  29 CFR 1910.120 — HAZWOPER full text ↗

  The actual standard. Read paragraphs (e), (g), (j), and (q) carefully — those are 70% of the exam. Appendix B (PPE level descriptions) is essential.

• Official
  OSHA Pub 3114 — Hazardous Waste Operations and Emergency Response ↗

  Agency-published primer on the standard. Smaller and more digestible than the full CFR text.

• Official
  NIOSH Pocket Guide to Chemical Hazards ↗

  Search any chemical to get its IDLH, exposure limits, target organs, and recommended PPE — essential reference for site characterization questions.