Free Hazmat Operations Exam Flashcards

Contain the release from a safe distance, keep it from spreading, and prevent exposures — without actually trying to stop the release (29 CFR 1910.120(q)(6)(ii)). Approaching the point of release to plug or patch it is Technician-level work.

Operations: at least 8 hours beyond the Awareness competencies, or sufficient experience to objectively demonstrate competency, with the employer certifying it. Technician: at least 24 hours equal to the Operations level plus additional competencies (29 CFR 1910.120(q)(6)(ii)-(iii)).

Section 9.2 (Personal Protective Equipment). The Pro Board lists Chapters 5 and 7 as prerequisites for 9.2 and Chapters 5, 7 and 9.2 for 9.3 through 9.10; many entities, including Kansas and North Carolina, test 9.2 and 9.6 (product control) together with Chapter 7 as the Operations certification.

Every year. 29 CFR 1910.120(q)(8)(i) requires annual refresher training of sufficient content and duration to maintain competency, or a yearly demonstration of that competency.

Analyze = 7.2.1 identify the scope of the problem; Plan = 7.3.1 identify the action options; Implement = 7.4.1 perform assigned tasks and 7.5.1 perform emergency decontamination; Evaluate = 7.6.1 evaluate and report the progress of the assigned actions.

Blue is health, red is flammability, yellow is instability, and white is special hazards. Blue, red and yellow carry a 0-4 rating in which 0 is least hazardous and 4 is most hazardous.

OX marks an oxidizer, W (shown with a slash through it) marks a water reactive, and SA marks a simple asphyxiant. NFPA 704 rates acute hazards only; chronic health effects are not covered.

Class 4 is flammable solids (4.1), spontaneously combustible material (4.2) and dangerous when wet material (4.3). Class 5 is oxidizers (5.1) and organic peroxides (5.2). Class 8 is corrosive material (49 CFR 173.2).

At the flash point. A Class 3 flammable liquid flashes at not more than 60 C (140 F); a combustible liquid flashes above 60 C (140 F) and below 93 C (200 F) when no other hazard class applies (49 CFR 173.120).

In a holder mounted inside the driver's-side door, or on the driver's seat (49 CFR 177.817(e)). With the driver belted in at the controls, the papers must be within immediate reach and either readily visible to a person entering the cab or in that door holder.

Yellow lists materials by four-digit ID number, blue lists them by material name, orange holds the numbered response guides (Guide 111 covers mixed load/unidentified cargo), and green gives initial isolation and protective action distances.

On an orange panel, across the center of the placard, or on a white square-on-point configuration (49 CFR 172.332). The orange panel measures 160 mm by 400 mm with 100 mm black numerals.

454 kg (1,001 lb) or more aggregate gross weight. Below that, a transport vehicle or freight container carrying only Table 2 materials needs no placards, while every Table 1 material is placarded in any quantity (49 CFR 172.504).

Once 1,000 kg (2,205 lb) or more of one Table 2 category is loaded at a single facility, that category's own placard must be applied. Below that, DANGEROUS may replace separate placards for non-bulk packages of two or more categories (49 CFR 172.504(b)).

CHEMTREC at 1-800-424-9300 connects you with the shipper's or manufacturer's emergency information, and the National Response Center at 1-800-424-8802 takes the federally required report of a reportable-quantity release. The shipping paper itself must also carry an emergency response telephone number (49 CFR 172.604).

The span of vapor-to-air concentrations between its lower and upper explosive limits that will burn if ignited. Gasoline's range is about 1.4-7.6 percent (NIOSH Pocket Guide): below the LEL the mix is too lean, above the UEL too rich, and a too-rich cloud becomes flammable as it dilutes at its edges.

Design pressure of not less than 100 psig and not more than 500 psig (49 CFR 178.337-1). These single-shell, rounded-end tanks carry liquefied compressed gases such as propane and anhydrous ammonia.

DOT 406 runs 2.65-4 psig and hauls fuels; DOT 407 is at least 25 psig with a circular cross-section and hauls chemicals; DOT 412 is at least 5 psig and hauls corrosives (49 CFR 178.346, 178.347 and 178.348).

Liquid inside carries heat away and keeps the wetted steel below failure temperature; the unwetted shell above the liquid line overheats, loses strength and can tear, letting the superheated liquid flash to vapor at once as a BLEVE. Rising internal pressure and a relief valve that grows louder or higher-pitched are signals to withdraw.

An MC-338 is a large, heavily insulated tank with a rear cabinet of valves and piping that may show frost or vent vapor; it carries refrigerated liquids that boil below -90 C (-130 F), such as liquid oxygen, nitrogen and argon (49 CFR 173.115). A tube trailer is a bundle of long horizontal cylinders with the valves grouped at one end, carrying non-liquefied gases such as hydrogen or helium at thousands of psi.

208 liters (55 US gallons). At or below that is a small spill, typically one drum, a small cylinder or a leak from a large package; more than that is a large spill and carries longer distances.

The initial isolation distance is the radius of a zone surrounding the spill in all directions. The protective action distance is the downwind distance within which people should be evacuated or sheltered in place.

For an instantaneous release of a package's entire contents, such as catastrophic failure, sabotage or terrorism. The tabulated distances assume a progressive release rather than a one-shot loss of containment.

The hot zone is the contaminated area, with entry limited to responders in proper PPE. The warm zone holds the contamination reduction corridor. The cold zone holds command, staging and support and must stay clean.

Upwind, uphill and upstream, so vapor, gravity and liquid runoff all carry the product away from crews. Reassess the position and move whenever the wind shifts.

Crosswind, perpendicular to the wind direction, and away from the spill, exactly as the ERG's Table 1 instructions direct. Moving people downwind walks them into the plume.

When the vapor cloud will pass quickly, when evacuating would route people through the plume, or when the population cannot be moved fast enough, as in hospitals and detention facilities.

The senior emergency response official on scene. Initially that is the senior officer on the first-due apparatus, and the role passes up the previously established line of authority as more senior officers arrive (29 CFR 1910.120(q)(3)(i)).

Positive-pressure self-contained breathing apparatus. Responders keep it until the individual in charge of the ICS determines through air monitoring that a lower level will not cause hazardous exposure (29 CFR 1910.120(q)(3)(iv)).

Using the buddy system, in groups of two or more, with the number of responders in areas of potential or actual exposure limited to those actively performing emergency operations (29 CFR 1910.120(q)(3)(v)).

Back-up personnel with equipment ready to provide assistance or rescue, plus advance first aid support personnel with medical equipment and transportation capability (29 CFR 1910.120(q)(3)(vi)).

The IC must designate one, and when activities are judged to be an IDLH or imminent danger condition, the safety official has authority to alter, suspend or terminate those activities (29 CFR 1910.120(q)(3)(vii) and (viii)).

Evaluate and report the progress of the assigned defensive actions: compare what is actually happening against the action plan and report the result to command so tactics can be continued or changed.

'Critique of response and follow-up' (29 CFR 1910.120(q)(2)(x)). In practice that means a debriefing, a post-incident analysis, and documented exposure records for every responder, because health effects can surface long after the scene is closed.

Rapid removal of contaminant when a life is at risk and there is no time for a formal corridor, usually a high-volume, low-pressure water flush. NFPA 470 makes it a core Operations job performance requirement (7.5.1), not a mission-specific add-on.

Technical decon is a planned, multi-station process for responders and their equipment with controlled entry and exit points. Emergency decon gives up that thoroughness for speed in order to stop an exposure immediately.

Reducing contamination on large numbers of exposed civilians quickly, usually through apparatus-based water corridors. Throughput matters more than thoroughness because the objective is to cut dose fast.

Removing clothing. Disrobing first and then flushing with water strips away the bulk of the contaminant, which is why clothing removal leads nearly every gross decontamination procedure.

A totally-encapsulating chemical-protective suit worn with positive-pressure full-facepiece SCBA, or a positive-pressure supplied-air respirator with escape SCBA. It gives the greatest skin, eye and respiratory protection (29 CFR 1910.120 Appendix B).

Level B keeps the same positive-pressure SCBA but substitutes hooded, non-encapsulating chemical-resistant clothing. It is chosen when the highest respiratory protection is needed but a lesser level of skin protection is acceptable.

The air contaminants must be identified and their concentrations measured, an air-purifying respirator must exist that removes them, exposed skin must not be affected, and all criteria for APR use must be met (OSHA Appendix B).

Air-purifying respirators filter the air but supply no oxygen. OSHA Appendix B calls for Level B or better whenever the atmosphere contains less than 19.5 percent oxygen.

NFPA 1990 (2022), which consolidated NFPA 1991 (vapor-protective, EPA Level A), NFPA 1992 (liquid splash-protective, Level B) and NFPA 1994. OSHA's Appendix B still cites the older standard numbers.

A dam blocks a waterway to hold or slow the product; a dike is a barrier built to keep product from spreading; diverting steers product away from an exposure; retention holds it in a pit or basin for later recovery.

Vapor suppression blankets the liquid, usually with foam, so it gives off less vapor. Vapor dispersion uses water fog or ventilation to move and dilute vapor that has already escaped.

Because the responder operates a control built to be reached without contacting the leak — such as the remote emergency shutoff on an MC-331 cargo tank or a facility emergency stop — rather than working at the point of release. NFPA 470 section 9.6 lists it with damming, diking, diversion, retention, absorption/adsorption, dilution, vapor suppression and vapor dispersion.

Below 19.5 percent or above 23.5 percent by volume (29 CFR 1910.146); normal air is 20.9 percent. Monitor in the order radiation, oxygen, flammability, then toxicity — oxygen before the LEL channel, because catalytic-bead sensors under-read without enough oxygen.

More than 10 percent of the material's lower flammable limit (29 CFR 1910.146). Treat that as an early warning threshold for withdrawal, not as a safe working concentration.

The total of all vapors the lamp can ionize, reported as isobutylene-equivalent ppm — not the identity or true concentration of any single chemical. Apply the correction factor for a known compound, and remember that gases with an ionization potential above the lamp's energy, such as methane with a 10.6 eV lamp, never register.

IDLH is a concentration that poses an immediate threat to life, irreversible or delayed harm, or an inability to escape (29 CFR 1910.120); a PEL is OSHA's legal limit for routine exposure, usually an 8-hour time-weighted average (29 CFR 1910.1000). The NIOSH Pocket Guide lists both, plus NIOSH RELs, for each chemical.