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CHMP practice questions

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Question 1Hazardous materials identification and handling in compliance with applicable laws and regulations

Under the Hazardous Materials Regulations, which agency maintains the Hazardous Materials Table that lists proper shipping names and hazard classes?

  1. The Pipeline and Hazardous Materials Safety Administration Correct answer.
  2. The Occupational Safety and Health Administration
  3. The Environmental Protection Agency
  4. The Nuclear Regulatory Commission

Explanation

The Hazardous Materials Table in 49 CFR 172.101 is maintained by PHMSA, which administers the Hazardous Materials Regulations. EPA, OSHA, and NRC regulate other areas such as waste, workplace safety, and radioactive materials respectively.

Question 2Hazardous materials identification and handling in compliance with applicable laws and regulations

A shipping paper describes a material with the entry 'UN1203, Gasoline, 3, PG II'. What does the '3' in this entry represent?

  1. The packing group of the material
  2. The hazard class assigned to the material Correct answer.
  3. The flash point in degrees Celsius
  4. The quantity in liters per package

Explanation

In the basic description, the digit following the proper shipping name is the hazard class. Gasoline is a Class 3 flammable liquid. Packing group is shown separately as PG II, and quantity and flash point are not part of the basic description.

Question 3Hazardous materials identification and handling in compliance with applicable laws and regulations

Which marking is required on a non-bulk package containing a hazardous material for transportation?

  1. The manufacturer's material safety data sheet number
  2. The receiving facility's EPA identification number
  3. The proper shipping name and UN identification number Correct answer.
  4. The employee's training completion date

Explanation

Non-bulk packages must be marked with the proper shipping name and UN identification number under 49 CFR 172.301, along with other applicable marks. SDS numbers, EPA IDs, and training dates are not package markings required by the HMR.

Question 4Hazardous materials identification and handling in compliance with applicable laws and regulations

A container of a Class 8 corrosive liquid must display which hazard label?

  1. An oxidizer label showing a circle and flame
  2. A toxic label showing a skull and crossbones
  3. A corrosive label showing the class 8 symbol Correct answer.
  4. A flammable liquid label showing a flame

Explanation

Class 8 materials are corrosives and require the corrosive hazard label, which depicts corrosion of skin and metal. Flammable liquid, oxidizer, and toxic labels correspond to Classes 3, 5.1, and 6.1 respectively.

Question 5Hazardous materials identification and handling in compliance with applicable laws and regulations

Under the HMR, who is responsible for providing the emergency response telephone number on a shipping paper?

  1. The offeror who prepares the shipping paper Correct answer.
  2. The consignee receiving the shipment
  3. The package manufacturer
  4. The carrier's dispatcher

Explanation

The offeror preparing the shipping paper must include an emergency response telephone number that is monitored at all times during transport. Carriers and consignees do not bear this specific documentation duty, and package manufacturers are unrelated to the shipping paper.

Question 6Hazardous materials identification and handling in compliance with applicable laws and regulations

What is the primary purpose of the Emergency Response Guidebook (ERG) in hazardous materials incidents?

  1. To certify employees as hazmat employees
  2. To determine the shelf life of chemical products
  3. To help first responders identify hazards and initial isolation distances Correct answer.
  4. To calculate shipping charges for hazardous loads

Explanation

The ERG provides guidance for initial response, including hazard identification by guide number and initial isolation and protective action distances. It does not certify employees, set freight charges, or address product shelf life.

Question 7Hazardous materials identification and handling in compliance with applicable laws and regulations

Which document must accompany a hazardous materials shipment and describe the material being transported?

  1. A purchase order
  2. A workplace injury log
  3. A bill of lading only for non-hazardous goods
  4. A shipping paper Correct answer.

Explanation

The shipping paper is the required transport document that identifies the hazardous material using the basic description. Injury logs, purchase orders, and non-hazardous bills of lading do not fulfill this function.

Question 8Hazardous materials identification and handling in compliance with applicable laws and regulations

A hazmat employee who packages and offers hazardous materials for transport must receive training under which regulation?

  1. 40 CFR Part 262 only
  2. 29 CFR 1910.1200 only
  3. 49 CFR Part 40
  4. 49 CFR Part 172 Subpart H Correct answer.

Explanation

Training requirements for hazmat employees are in 49 CFR Part 172 Subpart H, covering general awareness, function-specific, safety, and security awareness. Part 40 covers drug and alcohol testing, and the other citations address different programs.

Question 9Hazardous materials identification and handling in compliance with applicable laws and regulations

A material is listed in the Hazardous Materials Table with a 'plus' sign in Column 1. What does this indicate?

  1. The entry is a fixed proper shipping name that must be used exactly as shown Correct answer.
  2. The entry applies only to domestic shipments
  3. The material may only be shipped by air
  4. The material is exempt from labeling

Explanation

A plus sign in Column 1 designates a fixed proper shipping name that must be used precisely as listed, without substitution. It does not confer exemptions, restrict modes, or limit shipments to domestic routes.

Question 10Hazardous materials identification and handling in compliance with applicable laws and regulations

A shipper offers a liquid with a flash point of 45 degrees Celsius for transport. How is it classified under the HMR?

  1. As a Division 2.2 nonflammable gas
  2. As a Class 3 flammable liquid Correct answer.
  3. As a Division 6.1 toxic material
  4. As a Class 8 corrosive

Explanation

Class 3 flammable liquids have a flash point not more than 60 degrees Celsius and are not otherwise excluded. A 45 degree Celsius flash point falls within that range. Toxic, corrosive, and nonflammable gas classes address different hazards.

Question 11Hazardous materials identification and handling in compliance with applicable laws and regulations

A package contains a material whose hazard class requires a subsidiary label in addition to the primary label. Where should the subsidiary label be placed?

  1. On the shipping paper only
  2. Adjacent to the primary hazard label on the same package surface Correct answer.
  3. On the inside of the package
  4. On the carrier's vehicle placard

Explanation

Subsidiary hazard labels are placed near the primary hazard label on the package. They are not substituted by shipping paper entries, placed inside packages, or replaced by vehicle placards.

Question 12Hazardous materials identification and handling in compliance with applicable laws and regulations

When must placards be affixed to a transport vehicle carrying hazardous materials?

  1. When the quantity in the vehicle requires placarding under the placarding tables Correct answer.
  2. Whenever any hazmat package is aboard, regardless of quantity
  3. Only when the vehicle crosses a state line
  4. Only when the material is a waste

Explanation

Placarding is required when quantities reach the thresholds in the 49 CFR 172.504 table, including the 1,001-pound aggregate rule for Table 2 materials. Interstate travel, waste status, or the mere presence of any package do not by themselves trigger placarding.

Question 13Hazardous materials identification and handling in compliance with applicable laws and regulations

A shipper is preparing a shipping paper for a hazardous material. Which sequence correctly represents the basic description?

  1. Packing group, UN identification number, proper shipping name, hazard class
  2. Hazard class, proper shipping name, packing group, UN identification number
  3. UN identification number, packing group, hazard class, proper shipping name
  4. Proper shipping name, hazard class, UN identification number, packing group Correct answer.

Explanation

The basic description generally follows the order of proper shipping name, hazard class, UN identification number, and packing group, though the ID number may precede the name when authorized. The other sequences do not match the prescribed order.

Question 14Hazardous materials identification and handling in compliance with applicable laws and regulations

A consignee discovers that a received package of hazardous material is leaking. What is the appropriate initial action under hazmat handling practice?

  1. Return the package to the carrier without documentation
  2. Open the package to identify the contents
  3. Isolate the area and notify emergency response per the shipping paper information Correct answer.
  4. Place the package in a general waste dumpster

Explanation

A leaking hazmat package should be isolated and emergency responders notified using the emergency response information on the shipping paper. Opening the package increases exposure, and undocumented returns or disposal in general waste violate handling rules.

Question 15Hazardous materials identification and handling in compliance with applicable laws and regulations

Which information must appear on a hazardous waste manifest prepared under EPA rules?

  1. Only the generator's name and address
  2. Generator, transporter, and designated facility information with waste codes Correct answer.
  3. Only the transporter's DOT number
  4. Only the disposal cost estimate

Explanation

The uniform hazardous waste manifest tracks the waste from generator through transporter to the designated facility, identifying each party and the waste codes. Partial information such as only a name, DOT number, or cost does not satisfy manifest requirements.

Question 16Hazardous materials identification and handling in compliance with applicable laws and regulations

A hazmat employee's DOT training must be repeated under which condition?

  1. When the employee's job function changes or regulations change affecting the function Correct answer.
  2. Only when the employee changes employers
  3. Only after a workplace injury
  4. Only when the employee requests refresher training

Explanation

Recurrent training is required at least every three years, and retraining is also needed when job functions change or regulatory changes affect the employee's duties. Employee request, employer change, or injury are not the regulatory triggers.

Question 17Hazardous materials identification and handling in compliance with applicable laws and regulations

A package is marked with the UN packaging symbol '4G'. What does this code identify?

  1. A plastic jerrican
  2. A fiberboard box Correct answer.
  3. A steel drum
  4. A wooden crate

Explanation

In the UN packaging code, '4' designates a box and 'G' designates fiberboard, so 4G is a fiberboard box. Steel drums use codes beginning with 1, jerricans with 3, and wooden boxes with 4D or similar letters.

Question 18Hazardous materials identification and handling in compliance with applicable laws and regulations

A carrier is offered a hazardous material without a required shipping paper. What is the carrier's obligation?

  1. Accept the shipment and complete the paperwork later
  2. Refuse the shipment until proper documentation is provided Correct answer.
  3. Accept the shipment and notify the consignee on arrival
  4. Accept the shipment if the package has a label

Explanation

A carrier may not transport hazardous materials without the required shipping paper and must refuse the shipment until documentation is correct. Labels alone do not substitute for shipping papers, and completing paperwork later or notifying on arrival does not meet the requirement.

Question 19Hazardous materials identification and handling in compliance with applicable laws and regulations

Which factor determines the packing group assigned to a hazardous material?

  1. The degree of danger presented by the material within its hazard class Correct answer.
  2. The color of the package label
  3. The cost of the packaging
  4. The distance the material will travel

Explanation

Packing groups I, II, and III reflect the degree of danger within a hazard class, with I being the greatest. Cost, distance, and label color do not determine packing group assignment.

Question 20Hazardous materials identification and handling in compliance with applicable laws and regulations

A shipper must classify a new chemical that is not listed by name in the Hazardous Materials Table. What is the appropriate approach?

  1. Use the entry for the closest commercial product
  2. Select any entry that seems similar without testing
  3. Ship it as non-hazardous until a listing is created
  4. Determine the hazard class using the classification criteria in Part 173 and assign an appropriate generic entry Correct answer.

Explanation

Unlisted materials must be classified against the hazard criteria in 49 CFR Part 173 and assigned a generic or n.o.s. entry that matches the hazard. Guessing by similarity, shipping as non-hazardous, or borrowing a product entry is not acceptable.

Question 21Hazardous materials identification and handling in compliance with applicable laws and regulations

A vehicle carries 2,000 pounds of a Table 2 material and 500 pounds of another Table 2 material. What placarding is required?

  1. A placard only for the larger quantity material
  2. A single DANGEROUS placard is prohibited in all cases
  3. Placards for both Table 2 materials because the aggregate exceeds 1,001 pounds Correct answer.
  4. No placards because each material is below 1,001 pounds

Explanation

Under the 1,001-pound aggregate rule, Table 2 materials are added together, and if the total exceeds 1,001 pounds, each Table 2 material must be placarded. Individual quantities below the threshold do not avoid placarding when the aggregate exceeds it.

Question 22Hazardous materials identification and handling in compliance with applicable laws and regulations

A material meets the criteria for both Class 3 and Division 6.1. How is the primary hazard determined?

  1. By the shipper's preference
  2. By the packing group alone
  3. By applying the precedence of hazard rules in Part 173 to identify the primary class Correct answer.
  4. By the order in which the hazards are listed alphabetically

Explanation

When a material meets multiple hazard criteria, the precedence of hazard rules in 49 CFR 173.2a determine the primary class, with the other hazard shown as subsidiary. Alphabetical order, shipper preference, and packing group alone do not decide precedence.

Question 23Hazardous materials identification and handling in compliance with applicable laws and regulations

A generator ships hazardous waste to a facility that is not permitted to accept it. What is the consequence under the manifest system?

  1. The facility must accept the waste regardless of permits
  2. The transporter assumes all liability once the waste is loaded
  3. The manifest becomes void and no records are needed
  4. The generator retains responsibility and may face enforcement for improper management Correct answer.

Explanation

Under cradle-to-grave liability, the generator remains responsible for ensuring waste goes to a permitted facility and can face enforcement for improper management. Liability does not transfer solely to the transporter, and unpermitted facilities cannot lawfully accept the waste.

Question 24Hazardous materials identification and handling in compliance with applicable laws and regulations

A package bears a 'Cargo Aircraft Only' label. What does this restriction mean?

  1. The package may be carried only by ground transport
  2. The package may be carried only in the cabin
  3. The package may be carried on cargo aircraft but not on passenger aircraft Correct answer.
  4. The package may be carried on any aircraft without restriction

Explanation

The Cargo Aircraft Only label indicates the package is authorized only aboard cargo aircraft and is forbidden on passenger aircraft. It does not permit cabin carriage, unrestricted air transport, or ground-only movement.

Question 25Hazardous materials identification and handling in compliance with applicable laws and regulations

An employer stores incompatible hazardous materials together in a warehouse. Which regulatory principle is violated?

  1. The requirement to post shipping rates publicly
  2. The requirement to weigh each package monthly
  3. The requirement to label every package with a barcode
  4. Segregation requirements that keep incompatible materials apart to prevent dangerous reactions Correct answer.

Explanation

Segregation rules require incompatible materials to be separated to prevent dangerous reactions such as fires or toxic gas release. Barcoding, monthly weighing, and posting rates are not hazmat segregation requirements.

Question 26Hazardous materials identification and handling in compliance with applicable laws and regulations

Under the HMR, which agency maintains the Hazardous Materials Table that shippers use to determine proper shipping names and hazard classes?

  1. The Environmental Protection Agency (EPA)
  2. The Nuclear Regulatory Commission (NRC)
  3. The Occupational Safety and Health Administration (OSHA)
  4. The Pipeline and Hazardous Materials Safety Administration (PHMSA) Correct answer.

Explanation

The Hazardous Materials Regulations in 49 CFR Parts 100-185 are issued and maintained by PHMSA within the U.S. Department of Transportation, and the Hazardous Materials Table in 49 CFR 172.101 is the core reference for proper shipping names, classes, and packing groups. OSHA and EPA administer separate statutes covering workplace safety and environmental releases.

Question 27Hazardous materials identification and handling in compliance with applicable laws and regulations

A worker encounters a container labeled with a yellow-bordered diamond showing a flame symbol and the number 3. What does this label communicate?

  1. The material is a flammable liquid Correct answer.
  2. The material is a toxic solid
  3. The material is a corrosive acid
  4. The material is an oxidizing gas

Explanation

Class 3 is flammable liquid, and the flame pictogram on a red diamond is the standard hazard label for that class under 49 CFR 172.400 series. The flame symbol together with the class number identifies the primary hazard so handlers can apply ignition-source controls and appropriate packaging.

Question 28Hazardous materials identification and handling in compliance with applicable laws and regulations

What is the main purpose of a Safety Data Sheet provided under the OSHA Hazard Communication Standard?

  1. To give workers detailed hazard, handling, and first-aid information for a chemical Correct answer.
  2. To authorize a carrier to transport a regulated quantity
  3. To record the annual generation volume of hazardous waste
  4. To certify that a package meets UN performance testing

Explanation

The SDS is the primary information document under 29 CFR 1910.1200, organized into 16 sections covering hazards, safe handling, exposure controls, and emergency measures. It supports workplace risk assessment and training rather than transport certification or waste accounting.

Question 29Hazardous materials identification and handling in compliance with applicable laws and regulations

A facility stores drums of a strong oxidizer directly against drums of a flammable solvent. Which regulatory principle does this arrangement violate?

  1. Segregation of incompatible hazardous materials Correct answer.
  2. The requirement to mark packages with the UN symbol
  3. The requirement to placard storage buildings
  4. The requirement to retain shipping papers for two years

Explanation

Incompatible materials such as oxidizers and flammables must be separated so that a release or fire involving one does not intensify the hazard of the other, a principle reflected in HMR segregation rules and in OSHA and fire-code storage requirements. Placarding, record retention, and UN marking address transport communication, not physical compatibility.

Question 30Hazardous materials identification and handling in compliance with applicable laws and regulations

A shipper is completing a shipping paper and must enter the hazard class for a material whose proper shipping name is 'Acetone'. Which entry is correct?

  1. Class 8
  2. Division 6.1
  3. Class 3 Correct answer.
  4. Division 4.1

Explanation

Acetone is a flammable liquid assigned to Class 3 in the Hazardous Materials Table, so the shipping paper must show Class 3 in the hazard class column. The basic description combines the proper shipping name, hazard class, UN identification number, and packing group in the prescribed order.

Question 31Hazardous materials identification and handling in compliance with applicable laws and regulations

A hazmat employer is reviewing its training records and finds that an employee's function-specific training was completed 40 months ago with no refresher. What is the compliance status under the HMR?

  1. The training remains valid because recurrent training is required only every five years
  2. The training is overdue because recurrent training is required annually
  3. The training is overdue because recurrent training is required at least every three years Correct answer.
  4. The training remains valid because recurrent training is required only when regulations change

Explanation

49 CFR 172.704(c)(2) requires recurrent hazmat training at least once every three years, covering general awareness, function-specific, and safety training. At 40 months the employee is past the three-year interval and must be retrained before performing hazmat functions.

Question 32Hazardous materials identification and handling in compliance with applicable laws and regulations

A liquid has a flash point of 55 degrees Celsius and a boiling point of 200 degrees Celsius. How is it classified for packing group purposes under the HMR?

  1. It is not regulated because the flash point exceeds 50 degrees Celsius
  2. Packing Group II
  3. Packing Group III Correct answer.
  4. Packing Group I

Explanation

For Class 3 flammable liquids, Packing Group III applies to materials with an initial boiling point above 35 degrees Celsius and a flash point above 23 but not exceeding 60 degrees Celsius. A flash point of 55 degrees Celsius with a high boiling point therefore falls in Packing Group III.

Question 33Hazardous materials identification and handling in compliance with applicable laws and regulations

A package of a Division 6.1 material requires both a primary toxic label and a subsidiary corrosive label. How should the labels be applied?

  1. The subsidiary label on the top and the primary label on the bottom of the package
  2. Both labels on the same surface near the proper shipping name marking Correct answer.
  3. The labels on opposite sides of the package to avoid confusion
  4. Only the primary label, with the subsidiary hazard shown on the shipping paper

Explanation

Under 49 CFR 172.406, labels must be placed on the same surface of the package near the proper shipping name marking, and subsidiary labels go adjacent to the primary label. Splitting labels across surfaces or omitting the subsidiary label defeats the purpose of communicating combined hazards to handlers and responders.

Question 34Hazardous materials identification and handling in compliance with applicable laws and regulations

A generator is preparing a uniform hazardous waste manifest for a shipment of spent solvent. Which party must sign the manifest to acknowledge acceptance of the waste?

  1. The transporter only
  2. The EPA regional office
  3. The designated facility receiving the waste Correct answer.
  4. The generator only

Explanation

Under the RCRA manifest system in 40 CFR Part 262, the generator, transporter, and receiving facility each sign the manifest at their respective stages, and the designated facility's signature acknowledges acceptance of the waste. That signed copy is returned to the generator to close the cradle-to-grave tracking loop.

Question 35Hazardous materials identification and handling in compliance with applicable laws and regulations

A carrier is tendered a package bearing a 'Cargo Aircraft Only' label. What handling restriction applies?

  1. The package may be carried only by ground transport
  2. The package may be carried only in the cabin of a passenger aircraft
  3. The package may be carried on any aircraft if the pilot is notified
  4. The package may be carried aboard cargo aircraft but not passenger aircraft Correct answer.

Explanation

The Cargo Aircraft Only label, required under 49 CFR 172.400a for certain materials, restricts the package to cargo aircraft because passenger cabin and checked baggage environments cannot safely accommodate the hazard. Ground transport is not prohibited by the label, but air carriage on passenger aircraft is.

Question 36Hazardous materials identification and handling in compliance with applicable laws and regulations

A shipper must determine the proper shipping name for a material that is a mixture of two listed hazardous substances and meets the definition of a hazardous material. What is the correct first step?

  1. Use the trade name of the product as the proper shipping name
  2. Assign the name of the component with the lowest flash point
  3. Select the name of the component present in the largest quantity
  4. Determine whether the mixture is specifically listed by name in the Hazardous Materials Table Correct answer.

Explanation

Proper shipping name selection begins with the Hazardous Materials Table: if the mixture is specifically listed, that entry governs; if not, the shipper applies the generic or n.o.s. entries with the appropriate technical name. Trade names and arbitrary component selection are not permitted as proper shipping names.

Question 37Hazardous materials identification and handling in compliance with applicable laws and regulations

A shipper offers a material that meets the criteria for Division 4.3 (water-reactive) and Class 8 (corrosive). How is the primary hazard class determined?

  1. By the class with the lower UN identification number
  2. By the hazard class that appears first alphabetically
  3. By the precedence of hazard table in 49 CFR 173.2a Correct answer.
  4. By the class assigned by the packaging manufacturer

Explanation

When a material meets the definition of more than one hazard class, 49 CFR 173.2a provides a precedence table that determines which class is primary and which hazards are subsidiary. Alphabetical order, packaging supplier input, and UN number sequence play no role in that determination.

Question 38Hazardous materials identification and handling in compliance with applicable laws and regulations

A facility generates a spent cleaning solvent that exhibits the characteristic of ignitability. Under RCRA, how is this waste identified on the manifest?

  1. With the waste code D001 for the ignitability characteristic Correct answer.
  2. With no code, because characteristic wastes are exempt from manifesting
  3. With the waste code F001 for spent halogenated solvents
  4. With the waste code U002 for acetone

Explanation

Characteristic wastes are assigned D-series codes in 40 CFR Part 261 Subpart C, and D001 denotes ignitability. Listing codes such as F-series apply to listed wastes, and P- and U-series codes apply to discarded commercial chemical products, so the correct entry depends on which listing or characteristic applies.

Question 39Hazardous materials identification and handling in compliance with applicable laws and regulations

An employer's hazard communication program covers a newly purchased chemical, but the container arriving from the supplier bears only a GHS pictogram with no product identifier. What does the OSHA Hazard Communication Standard require on the supplier label?

  1. Pictograms and the CAS registry number only
  2. Product identifier, signal word, hazard statements, and precautionary statements Correct answer.
  3. Product identifier and the manufacturer's phone number only
  4. Signal word and the shipping name only

Explanation

29 CFR 1910.1200(f) requires shipped containers to bear a label with the product identifier, signal word, hazard statement or statements, pictogram or pictograms, and precautionary statements, plus supplier contact information. A pictogram alone does not satisfy the labeling requirement.

Question 40Hazardous materials identification and handling in compliance with applicable laws and regulations

A warehouse holds a material classified as Division 5.1 (oxidizer) in a quantity that requires placarding when transported. Which storage practice best reflects the hazard communication and compatibility principles applied to oxidizers?

  1. Store with compressed gases to consolidate cylinder handling
  2. Store away from flammable and combustible materials and keep the original labels legible Correct answer.
  3. Store in unmarked containers to discourage tampering
  4. Store adjacent to flammables so a single fire-suppression system covers both

Explanation

Oxidizers intensify combustion and must be segregated from flammable and combustible materials, with labels and markings kept intact so workers can identify the hazard. Consolidating oxidizers with flammables or gases increases the severity of any incident and undermines hazard communication.

Question 41Planning and preparing for and responding to hazmat emergencies and incidents

During the initial response to a chlorine release from a rail tank car, which source should the responder consult first to determine initial isolation and protective action distances?

  1. The shipping paper and bill of lading
  2. The Emergency Response Guidebook (ERG) Correct answer.
  3. The facility's Tier II emergency contact list
  4. The Safety Data Sheet (SDS) for chlorine

Explanation

The ERG is designed for the first minutes of a hazmat incident and gives initial isolation distances, protective action distances, and guide-page response tactics based on the material name or placard. SDSs and shipping papers identify the material and its hazards but do not provide pre-calculated isolation distances. The Tier II contact list supports notifications, not scene isolation decisions.

Question 42Planning and preparing for and responding to hazmat emergencies and incidents

A responder is establishing command at a hazmat incident and must decide where to place the initial isolation perimeter. Which principle should guide that decision?

  1. Set the perimeter where the first-arriving crew parked its apparatus
  2. Place the perimeter upwind and uphill beyond the ERG isolation distance Correct answer.
  3. Establish the perimeter at the nearest road intersection for traffic control
  4. Set the perimeter at the visible edge of the spilled liquid

Explanation

Initial isolation should be established upwind, uphill, and upstream of the release and beyond the distance recommended by the ERG or other authoritative guidance, because vapors and runoff travel with wind and gravity. The visible edge of a liquid pool does not account for vapor travel or fire. Apparatus placement and intersections are logistics decisions that should follow, not define, the isolation perimeter.

Question 43Planning and preparing for and responding to hazmat emergencies and incidents

Which document must accompany a shipment of hazardous materials by highway and be available to responders at the scene?

  1. The shipping paper (bill of lading) Correct answer.
  2. The shipper's internal quality control log
  3. The driver's medical certification card
  4. The vehicle registration and insurance card

Explanation

Federal hazardous materials regulations require shipping papers to accompany hazardous materials shipments and to be readily accessible to responders, identifying the material, hazard class, quantity, and emergency contact. The other documents support administration or driver qualification but do not describe the hazardous contents for response purposes.

Question 44Planning and preparing for and responding to hazmat emergencies and incidents

A tanker truck is involved in a fire and responders observe a pressure-relief device venting and the tank surface discoloring. What is the most appropriate tactical decision?

  1. Approach and cool the tank from the ends with a master stream
  2. Send a crew to close the emergency shutoff valve at the tank
  3. Withdraw to a safe distance and protect exposures from cover Correct answer.
  4. Apply foam directly onto the relief device to stop the venting

Explanation

Venting, discoloration, and fire impingement on a pressurized tank are indicators of a potential boiling liquid expanding vapor explosion (BLEVE). The correct action is to withdraw personnel and protect exposures from a distance, because the tank can fail catastrophically. Cooling from the ends of a horizontal tank still places crews within the fragmentation zone, and approaching to close valves or plug the relief device is extremely dangerous.

Question 45Planning and preparing for and responding to hazmat emergencies and incidents

When selecting PPE for the initial approach to an unknown spilled liquid, which level of protection provides the highest level of respiratory and skin protection?

  1. Level C
  2. Level B
  3. Level A Correct answer.
  4. Level D

Explanation

Level A consists of a fully encapsulating vapor-protective suit with SCBA or supplied air, giving the highest protection against both respiratory and skin hazards. Level B provides the same respiratory protection but less skin protection, Level C uses air-purifying respirators, and Level D offers no respiratory protection.

Question 46Planning and preparing for and responding to hazmat emergencies and incidents

A chemical with a vapor density greater than 1 is released in a low-lying area with little wind. What behavior should responders anticipate?

  1. The vapor will remain fixed at the point of release
  2. The vapor will rise rapidly and disperse overhead
  3. The vapor will dissolve instantly into the surrounding soil
  4. The vapor will collect and travel along low areas and depressions Correct answer.

Explanation

Vapor density greater than 1 means the gas is heavier than air, so it tends to settle and flow along low ground, ditches, and basements, creating an extended downwind hazard. This affects where isolation zones and ignition controls must be placed. Vapors that rise are lighter than air, and gases do not remain stationary in moving air.

Question 47Planning and preparing for and responding to hazmat emergencies and incidents

Which placard indicates a material that may react violently with water and should not be approached with water streams?

  1. Dangerous when wet Correct answer.
  2. Flammable liquid
  3. Oxidizer
  4. Corrosive

Explanation

The dangerous-when-wet placard (Class 4.3) identifies materials that react with water to release flammable or toxic gases, so water must not be applied. Flammable liquid, oxidizer, and corrosive placards indicate other hazards and do not specifically warn of water reactivity.

Question 48Planning and preparing for and responding to hazmat emergencies and incidents

During size-up at a hazardous materials incident, which factor most directly determines whether a defensive or offensive strategy can be selected?

  1. Whether trained personnel and adequate PPE/equipment are available Correct answer.
  2. The time of day the incident occurred
  3. The number of media representatives on scene
  4. The color of the smoke visible from the release

Explanation

Strategy selection depends on whether the response organization has trained hazmat personnel and sufficient PPE, monitoring, and equipment to safely conduct offensive operations. Without those resources, a defensive or non-intervention strategy is required. Media presence, smoke color, and time of day may inform the size-up but do not by themselves determine strategy.

Question 49Planning and preparing for and responding to hazmat emergencies and incidents

What is the primary purpose of establishing hot, warm, and cold zones at a hazardous materials incident?

  1. To mark the property boundaries for insurance purposes
  2. To divide the scene among responding agencies by rank
  3. To separate the public, the support personnel, and the contamination-control functions Correct answer.
  4. To designate where news media may conduct interviews

Explanation

Control zones organize the scene by contamination risk: the hot zone is the contaminated area, the warm zone is the contamination reduction corridor, and the cold zone is the clean support area. This structure keeps unprotected people away and controls the movement of personnel and equipment. The zones are not defined by agency rank, media access, or property lines.

Question 50Planning and preparing for and responding to hazmat emergencies and incidents

A decontamination corridor is being set up at a hazmat incident. Where should it be located relative to wind and terrain?

  1. At the lowest point of the site to allow runoff to collect
  2. Directly at the entry point where crews don their suits
  3. Upwind or crosswind of the hot zone, on ground that slopes away from the release Correct answer.
  4. Downwind of the hot zone to allow vapors to disperse away from the corridor

Explanation

The decontamination corridor should be positioned upwind or crosswind and on higher ground so that vapors and runoff do not flow into the clean area. Placing it downwind or at a low point would expose decon workers and clean personnel to contamination. Donning and doffing areas are part of the corridor but do not define its optimal location.