Practice Test Geeks(CMC) Certified Marine Chemist Practice Test
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Hazardous Materials Management & Containment Flashcards

7 cards from real CMC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Under 49 CFR (DOT hazmat regulations), a vessel transporting hazardous materials in portable tanks must ensure emergency response information is:

    Answer: Available at all times during transport, including an emergency response telephone number

    49 CFR 172.604 requires emergency response information, including a 24-hour telephone contact, to be immediately accessible during transport of hazardous materials.

  2. Which UN hazard class covers corrosive substances such as sulfuric acid when transported aboard a vessel?

    Answer: Class 8 — Corrosive Substances

    Corrosive substances capable of destroying living tissue or metal are classified as UN Class 8 under the GHS/DOT/IMDG hazard classification system.

  3. When segregating hazardous cargo aboard a vessel per the IMDG Code, which combination requires 'separated by a complete compartment or hold' designation?

    Answer: Oxidizers stowed adjacent to flammable liquids

    The IMDG Code requires maximum segregation (separated compartment/hold) between oxidizers and flammable liquids because their combination dramatically lowers the ignition threshold.

  4. A secondary containment system for hazardous liquid storage aboard a vessel must have a capacity of at least:

    Answer: 100% of the largest single container, or 10% of the total stored volume, whichever is greater

    EPA 40 CFR 264.175 and general industry practice require secondary containment sufficient to hold 100% of the largest container or 10% of total volume, whichever is greater.

  5. Under CERCLA (Superfund), which party bears primary liability for cleanup costs when a vessel releases a hazardous substance into US navigable waters?

    Answer: The vessel owner and operator as potentially responsible parties (PRPs)

    CERCLA imposes strict, joint, and several liability on vessel owners and operators as PRPs for releases of hazardous substances into navigable waters.

  6. A marine chemist suspects a tank atmosphere contains carbon monoxide (CO) after smoldering cargo. The IDLH for CO established by NIOSH is:

    Answer: 1,200 ppm

    NIOSH sets the IDLH for carbon monoxide at 1,200 ppm, representing the concentration immediately dangerous to life or health for 30-minute exposure.

  7. When a Certified Marine Chemist encounters a tank whose prior cargo created polymer residues that may off-gas toxic isocyanates, the most critical atmospheric test is for:

    Answer: Specific toxic vapor using a calibrated photoionization or electrochemical sensor for isocyanates

    Isocyanates are highly toxic at extremely low concentrations; a specific sensor calibrated for isocyanate detection is required because LEL or O₂ sensors will not detect this hazard.