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NJ Asbestos Abatement study materials
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NJ Asbestos Abatement practice questions

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Question 1Asbestos Abatement Work Practices and Procedures

Before beginning abatement in a regulated area, the first step in establishing containment is to do which of the following?

  1. Post warning signs and seal the work area openings Correct answer.
  2. Bag the visible debris
  3. Wet the debris with amended water
  4. Remove the HVAC filters

Explanation

Containment begins with isolating the work area: posting warning signs and sealing doors, windows, and other openings so fibers cannot migrate. Wetting, filter removal, and bagging are later or supplementary steps, not the initial containment action.

Question 2Asbestos Abatement Work Practices and Procedures

Amended water is used during asbestos abatement primarily to accomplish which purpose?

  1. Increase the adhesion of encapsulants
  2. Suppress airborne fiber release Correct answer.
  3. Dissolve asbestos fibers into solution
  4. Neutralize the chemical hazard of asbestos

Explanation

Amended water (water with a wetting agent) reduces surface tension so fibers stay wet and are less likely to become airborne. Asbestos does not dissolve, and wetting is a dust-control measure rather than a chemical neutralization.

Question 3Asbestos Abatement Work Practices and Procedures

Which type of respirator provides the minimum acceptable protection for most asbestos abatement work?

  1. Half-face air-purifying respirator with HEPA filters Correct answer.
  2. Surgical mask
  3. N95 dust mask
  4. Powered air-purifying respirator without HEPA filters

Explanation

Abatement requires at minimum a half-face air-purifying respirator equipped with HEPA filters, which capture fibers at high efficiency. Surgical masks and standard N95 masks do not provide adequate protection for regulated asbestos work.

Question 4Asbestos Abatement Work Practices and Procedures

The purpose of a decontamination unit in an abatement project is to do which of the following?

  1. House the project supervisor's office
  2. Store abatement tools between shifts
  3. Provide a clean-to-dirty passage that prevents fiber spread Correct answer.
  4. Filter the building's HVAC air supply

Explanation

A decontamination unit provides a sequence of rooms (clean, shower, equipment/dirty) so workers and equipment can move between the work area and clean areas without carrying fibers out. It is a contamination-control passage, not a storage or office space.

Question 5Asbestos Abatement Work Practices and Procedures

When bagging asbestos-containing waste, the outer bag should be which of the following?

  1. Clearly labeled as asbestos waste and free of visible dust Correct answer.
  2. Left unsealed until transport
  3. Made of paper for breathability
  4. Transparent so contents are visible

Explanation

Waste bags must be labeled with the required asbestos warning and be free of visible dust on the outside before leaving the work area. Labeling and cleanliness of the exterior prevent exposure during handling and transport.

Question 6Asbestos Abatement Work Practices and Procedures

Which work practice reduces fiber release when removing a pipe with asbestos-containing insulation?

  1. Wetting the insulation and wrapping it before removal Correct answer.
  2. Removing the insulation in large dry sections
  3. Cutting the pipe with a power saw while dry
  4. Striking the pipe to break the insulation loose

Explanation

Wetting the insulation and wrapping it before removal keeps fibers bound and minimizes airborne release. Dry, forceful, or mechanical methods increase fiber dispersal and are avoided.

Question 7Asbestos Abatement Work Practices and Procedures

A negative air pressure machine is installed in a containment to do which of the following?

  1. Heat the work area
  2. Supply fresh air to workers
  3. Create a pressure differential so air flows into the containment Correct answer.
  4. Increase humidity to weigh fibers down

Explanation

Negative air machines exhaust air through HEPA filters and maintain lower pressure inside the containment so air flows inward, preventing fiber escape. They do not heat, supply air, or humidify the space.

Question 8Asbestos Abatement Work Practices and Procedures

During abatement, a worker finds a section of insulation that was not wetted before disturbance. The correct action is to do which of the following?

  1. Cover it with a plastic sheet and continue
  2. Stop, wet the material, and then proceed Correct answer.
  3. Continue and wet it later during cleanup
  4. Vacuum the area with a shop vacuum

Explanation

Material must be wetted before disturbance to prevent fiber release; stopping to wet it is the proper response. Continuing or using a non-HEPA vacuum would allow fibers to spread.

Question 9Asbestos Abatement Work Practices and Procedures

Which of the following best describes the correct sequence for removing a section of asbestos-containing floor tile?

  1. Remove tiles dry and vacuum the adhesive with a shop vacuum
  2. Use a grinder to remove adhesive and tile together
  3. Wet the tiles, pry them up intact, and place them in labeled waste containers Correct answer.
  4. Break tiles dry and sweep up fragments

Explanation

Floor tile should be wetted, removed intact where possible, and placed in labeled containers to minimize fiber release. Dry breaking, grinding, and non-HEPA vacuuming generate and spread fibers.

Question 10Asbestos Abatement Work Practices and Procedures

The purpose of a critical barrier in an abatement containment is to do which of the following?

  1. Mark the location of electrical lines
  2. Prevent the movement of fibers to uncontaminated areas Correct answer.
  3. Hold negative air machines in place
  4. Support the ceiling of the work area

Explanation

Critical barriers seal openings and penetrations to prevent fiber migration from the work area to clean spaces. They are contamination-control elements, not structural supports or equipment mounts.

Question 11Asbestos Abatement Work Practices and Procedures

Which of the following is the correct way to handle a HEPA vacuum during abatement?

  1. Use it only after final visual inspection
  2. Share it between clean and dirty areas without cleaning
  3. Empty its contents into an open trash can
  4. Use it to clean surfaces and equipment within the containment Correct answer.

Explanation

HEPA vacuums are used within the containment to clean surfaces and equipment without releasing fibers. They should not be moved between clean and dirty zones without decontamination, and contents must be handled as asbestos waste.

Question 12Asbestos Abatement Work Practices and Procedures

A worker exiting the work area should pass through the decontamination unit in which order?

  1. Shower, dirty room, clean room
  2. Dirty room, shower, clean room Correct answer.
  3. Clean room, shower, dirty room
  4. Dirty room, clean room, shower

Explanation

Workers move from the dirty room, through the shower to remove contamination, into the clean room before exiting. This sequence prevents fibers from being carried into clean areas.

Question 13Asbestos Abatement Work Practices and Procedures

Which of the following is the appropriate action when the final visual inspection of a containment fails?

  1. Remove the containment immediately
  2. Proceed to clearance air sampling anyway
  3. Re-clean the area and repeat the visual inspection Correct answer.
  4. Spray the area with encapsulant and exit

Explanation

If visible debris remains, the area must be re-cleaned and the visual inspection repeated before clearance sampling. Proceeding to sampling or removing containment with debris present would risk fiber release.

Question 14Asbestos Abatement Work Practices and Procedures

Which of the following best describes the purpose of encapsulants in abatement?

  1. Provide structural reinforcement to the building
  2. Replace the need for respiratory protection
  3. Bind fibers together or seal the surface to prevent release Correct answer.
  4. Dissolve asbestos fibers

Explanation

Encapsulants bind fibers or seal surfaces so they cannot become airborne; they do not dissolve asbestos or replace other controls. Respiratory protection and containment remain necessary.

Question 15Asbestos Abatement Work Practices and Procedures

When removing a suspended ceiling that contains asbestos, the worker should do which of the following first?

  1. Remove the grid before the tiles
  2. Break the tiles to speed removal
  3. Wet the tiles and remove them carefully Correct answer.
  4. Vacuum the tiles with a shop vacuum

Explanation

Ceiling tiles should be wetted before and during removal to suppress fiber release and handled carefully to avoid breakage. Breaking tiles, dry handling, and non-HEPA vacuuming increase fiber dispersal.

Question 16Asbestos Abatement Work Practices and Procedures

Which of the following is the correct method for disposing of asbestos-containing waste?

  1. Bury it on site
  2. Burn it in a controlled area
  3. Place it in an open dumpster at the site
  4. Seal it in leak-tight, labeled containers and dispose at an approved landfill Correct answer.

Explanation

Asbestos waste must be sealed in leak-tight, labeled containers and transported to an approved landfill. Open dumping, burning, and on-site burial are not acceptable disposal methods.

Question 17Asbestos Abatement Work Practices and Procedures

A worker is preparing to remove asbestos-containing gaskets from a flange. Which practice best minimizes fiber release?

  1. Wet the gasket and use hand tools to remove it Correct answer.
  2. Use a power grinder to remove the gasket
  3. Break the flange to remove the gasket
  4. Scrape the gasket dry with a putty knife

Explanation

Wetting the gasket and using hand tools keeps fibers bound and minimizes release. Dry scraping, grinding, and breaking the flange generate dust and are not acceptable.

Question 18Asbestos Abatement Work Practices and Procedures

Which of the following is a required element of a regulated area during abatement?

  1. A break room for workers
  2. A storage area for clean clothing
  3. Warning signs at each entry point Correct answer.
  4. An open window for ventilation

Explanation

Regulated areas must be marked with warning signs at entry points to prevent unauthorized access. Break rooms, clean clothing storage, and open windows are not required elements and open windows would compromise containment.

Question 19Asbestos Abatement Work Practices and Procedures

During abatement, a worker notices the negative air pressure gauge shows the containment is under positive pressure. The best action is to do which of the following?

  1. Open a window to balance the pressure
  2. Continue and increase wetting
  3. Stop work and correct the pressure differential Correct answer.
  4. Ignore it because pressure does not matter

Explanation

Containment must remain under negative pressure so air flows inward; positive pressure can allow fibers to escape. Work should stop until the pressure differential is corrected.

Question 20Asbestos Abatement Work Practices and Procedures

A crew is removing asbestos-containing boiler insulation. Which combination of controls best reflects required work practices?

  1. Wetting only, with no containment
  2. Removal during occupied hours to speed the job
  3. Wetting, local exhaust, and HEPA vacuuming Correct answer.
  4. Dry removal with a fan for ventilation

Explanation

Wetting, local exhaust ventilation, and HEPA vacuuming work together to suppress and capture fibers during boiler insulation removal. Dry removal, inadequate containment, and occupied-hours work increase exposure risk.

Question 21Asbestos Abatement Work Practices and Procedures

A worker must remove a small section of asbestos-containing material that was previously encapsulated. Which approach is most appropriate?

  1. Treat it as asbestos-containing and follow abatement work practices Correct answer.
  2. Use a shop vacuum to clean the area afterward
  3. Assume encapsulation makes removal unnecessary
  4. Remove it dry because it is a small amount

Explanation

Encapsulated material remains asbestos-containing and must be handled with full abatement work practices when disturbed. Small quantity does not exempt the work from fiber-control requirements.

Question 22Asbestos Abatement Work Practices and Procedures

During a project, the project monitor observes visible dust on the floor outside the containment. The most appropriate response is to do which of the following?

  1. Increase the number of workers in the containment
  2. Cover the dust with a plastic sheet
  3. Continue work and clean up at the end of the shift
  4. Stop work, investigate the breach, and clean the affected area Correct answer.

Explanation

Visible dust outside containment indicates a containment breach and possible fiber migration; work should stop while the breach is investigated and the area cleaned. Delaying cleanup or covering the dust does not address the release.

Question 23Asbestos Abatement Work Practices and Procedures

A worker is using a glove bag to remove insulation from a valve. Which practice best ensures the glove bag functions as intended?

  1. Use the bag only after the insulation is removed
  2. Seal the bag around the valve and work through the gloves Correct answer.
  3. Cut a large opening in the bag for easier access
  4. Leave the bag open to the room for ventilation

Explanation

A glove bag must be sealed around the component so the work is performed through the gloves, keeping fibers contained. Cutting openings or leaving it open defeats the purpose, and the bag must be in place before removal begins.

Question 24Asbestos Abatement Work Practices and Procedures

Which of the following best explains why dry sweeping is avoided in an abatement containment?

  1. It damages the plastic sheeting
  2. It re-suspends settled fibers into the air Correct answer.
  3. It is slower than wet methods
  4. It requires more workers

Explanation

Dry sweeping re-suspends settled fibers, increasing airborne concentrations and worker exposure. Wet methods and HEPA vacuuming keep fibers bound or captured.

Question 25Asbestos Abatement Work Practices and Procedures

A supervisor is planning the order of work for a large abatement project. Which sequence best reflects accepted practice?

  1. Establish containment and decontamination, then remove material, then clean and inspect Correct answer.
  2. Remove waste first, then establish containment
  3. Remove material, then post signs, then establish containment
  4. Clean the area, then establish containment, then remove material

Explanation

Containment and decontamination must be established before material is disturbed, followed by removal, cleanup, and visual inspection. Removing material or cleaning before containment defeats fiber control.

Question 26Asbestos Abatement Work Practices and Procedures

Before beginning abatement in an occupied building, the work area must be isolated from the rest of the building primarily to do which of the following?

  1. Reduce the noise generated by removal equipment
  2. Protect the abatement crew from theft of tools
  3. Prevent asbestos fibers from migrating to occupied spaces Correct answer.
  4. Keep building occupants from observing the work

Explanation

Containment and regulated-area isolation exist to stop fiber migration beyond the work area. Sealing openings, blocking HVAC, and maintaining negative pressure keep airborne fibers from reaching occupied spaces.

Question 27Asbestos Abatement Work Practices and Procedures

Which material is used to seal small openings, penetrations, and seams in a containment's plastic sheeting?

  1. Latex paint
  2. Water-based wax
  3. Duct tape or spray adhesive Correct answer.
  4. Masking tape

Explanation

Seams and penetrations are sealed with tape or spray adhesive so the enclosure stays airtight and holds negative pressure. Paint and wax do not bond reliably to polyethylene.

Question 28Asbestos Abatement Work Practices and Procedures

What is the primary reason workers wear disposable protective clothing during abatement?

  1. To identify crew members from supervisors
  2. To protect street clothes from paint and adhesive
  3. To keep the worker warm in cold work areas
  4. To prevent asbestos fibers from being carried out on clothing Correct answer.

Explanation

Disposable coveralls prevent fibers from clinging to clothing and being transported out of the work area. They are removed in the decontamination unit so contamination is left behind.

Question 29Asbestos Abatement Work Practices and Procedures

Why must asbestos-containing waste be wetted and placed in sealed, labeled containers before removal from the site?

  1. To keep fibers bound and prevent release during handling and transport Correct answer.
  2. To satisfy recycling requirements for construction debris
  3. To make the waste easier to compact at the landfill
  4. To reduce the overall weight of the waste load

Explanation

Wetting keeps fibers from becoming airborne, and sealed labeled containers prevent release during handling and transport. Waste is not compacted in a way that could liberate fibers.

Question 30Asbestos Abatement Work Practices and Procedures

In a decontamination unit, what is the function of the shower located between the clean room and the equipment room?

  1. To remove asbestos contamination from the worker before entering the clean room Correct answer.
  2. To cool workers after heavy physical labor
  3. To store and rinse reusable respirator cartridges
  4. To serve as the airlock that maintains negative pressure

Explanation

The shower is a transition point where a worker washes off contamination before moving toward the clean room. Cartridge storage and pressure control are handled by other parts of the system.

Question 31Asbestos Abatement Work Practices and Procedures

What does a HEPA filter on a vacuum or negative air machine accomplish?

  1. It traps particles of respirable size rather than passing them through Correct answer.
  2. It removes odors and gases from the airstream
  3. It sterilizes the air as it passes through
  4. It increases airflow by reducing filter resistance

Explanation

A HEPA filter captures particles at high efficiency in the respirable size range, keeping fibers out of the exhaust. It does not remove gases or sterilize air.

Question 32Asbestos Abatement Work Practices and Procedures

Which action should a worker take immediately upon discovering a tear in the containment plastic during abatement?

  1. Continue working and report the tear at the end of the shift
  2. Stop work in the area and repair the breach before continuing Correct answer.
  3. Increase the number of negative air machines and continue
  4. Place a waste bag over the tear and keep working

Explanation

Any breach in containment can allow fiber release, so work near the breach stops and the barrier is repaired. Reporting later or improvising a cover does not restore containment integrity.

Question 33Asbestos Abatement Work Practices and Procedures

What is the purpose of applying a lockdown or bridging encapsulant to surfaces after asbestos material has been removed?

  1. To restore the original fire rating of the substrate
  2. To bind any residual fibers and dust to the surface Correct answer.
  3. To make the surface waterproof for future use
  4. To loosen remaining material for a second removal pass

Explanation

A lockdown encapsulant penetrates and binds residual dust and fibers so they are not easily disturbed. It is not a fire-rating restoration or waterproofing product.

Question 34Asbestos Abatement Work Practices and Procedures

A worker is cutting a section of asbestos-cement pipe. Which practice best reduces fiber release at the cut point?

  1. Cut with a power saw at high speed to finish quickly
  2. Wet the pipe and cut with a hand tool while misting the cut Correct answer.
  3. Break the pipe with a hammer after wrapping it in plastic
  4. Score the pipe dry and snap it over the knee

Explanation

Wetting the material and cutting slowly with hand tools keeps fibers bound and minimizes aerosolization. High-speed power cutting and dry snapping generate dust.

Question 35Asbestos Abatement Work Practices and Procedures

When removing asbestos-containing ductwork, what is the recommended practice regarding the duct's interior?

  1. Seal the ends of each duct section before it is detached and moved Correct answer.
  2. Blow compressed air through the duct to clear loose material
  3. Stack open duct sections inside the containment for later cleaning
  4. Leave the ends open so the section is easier to handle

Explanation

Sealing duct ends immediately after detachment prevents material and fibers from spilling during handling and transport. Open ends or compressed air would spread contamination.

Question 36Asbestos Abatement Work Practices and Procedures

Which practice is appropriate when removing a large, friable section of sprayed-on ceiling material?

  1. Use a fan to dry the material so it adheres less to the substrate
  2. Mist the material continuously and lower it in small sections into lined containers Correct answer.
  3. Pry off large chunks and let them fall to the floor for later pickup
  4. Remove the material dry and vacuum the floor afterward

Explanation

Keeping friable material wet and handling it in small pieces limits fiber release, and immediate containerization prevents re-suspension. Letting chunks fall or drying the material increases airborne fibers.

Question 37Asbestos Abatement Work Practices and Procedures

A crew is setting up a containment and must route exhaust from negative air machines. Where should the exhaust be directed?

  1. To a location outside the work area where it will not re-enter the building Correct answer.
  2. Into an adjacent occupied office to dilute the exhaust
  3. Back into the containment to recirculate filtered air
  4. Into the building's return-air plenum

Explanation

HEPA-filtered exhaust must discharge outside the regulated area and away from air intakes so it cannot re-enter the building. Discharging into occupied or return-air spaces risks contamination.

Question 38Asbestos Abatement Work Practices and Procedures

What is the correct approach for removing asbestos-containing resilient floor tile that is adhered with black mastic?

  1. Dry-chisel the tile and grind the mastic from the floor
  2. Break the tile into small pieces with a hammer before removal
  3. Heat the tile with a torch to soften the mastic before lifting
  4. Wet the tile and mastic and pry tiles up intact, then scrape the mastic wet Correct answer.

Explanation

Wetting and lifting tiles intact minimizes fiber release, and mastic is removed wet to keep dust down. Grinding, heating, or hammering generates dust or hazardous fumes.

Question 39Asbestos Abatement Work Practices and Procedures

Why are drop cloths placed on the floor of a containment before removal work begins?

  1. To cushion workers standing for long periods
  2. To mark the boundary of the regulated area
  3. To insulate the floor from cold temperatures
  4. To catch debris and allow easy wrapping for disposal Correct answer.

Explanation

Floor coverings catch falling debris and can be folded and wrapped for disposal, simplifying cleanup. They do not define the regulated boundary or serve comfort functions.

Question 40Asbestos Abatement Work Practices and Procedures

A worker is removing a valve assembly covered with asbestos insulation and will use a glove bag. What should be done before the bag is attached?

  1. Cut the insulation away first so the bag fits more easily
  2. Attach the bag loosely so air can escape during work
  3. Clean the surfaces where the bag will be taped and pre-wet the material inside Correct answer.
  4. Fill the bag with dry absorbent to soak up dust

Explanation

Tape adheres only to clean surfaces, so the attachment area is wiped clean and the material is wetted inside the bag before disturbance. Loose attachment or dry absorbent undermines the glove bag's containment.

Question 41Asbestos Abatement Work Practices and Procedures

What is the purpose of a personal air sampling pump worn by a worker during abatement?

  1. To monitor the containment's pressure differential
  2. To supply filtered breathing air to the respirator
  3. To measure the worker's exposure to airborne fibers Correct answer.
  4. To record the worker's location within the work area

Explanation

Personal sampling pumps draw air through a filter at the worker's breathing zone to estimate individual exposure. They do not supply air, measure pressure, or track location.

Question 42Asbestos Abatement Work Practices and Procedures

When abatement is complete and the area has passed visual inspection, what is the purpose of clearance air sampling?

  1. To determine the disposal category of the waste
  2. To identify which workers need medical surveillance
  3. To verify that negative air machines are still operating
  4. To confirm airborne fiber concentrations are acceptable before reoccupancy Correct answer.

Explanation

Clearance sampling documents that fiber levels in the work area meet the applicable standard before the space is released. It does not classify waste or determine medical surveillance needs.

Question 43Asbestos Abatement Work Practices and Procedures

A worker must remove asbestos-containing insulation from a horizontal pipe run that passes through a wall. What practice best maintains containment at the wall penetration?

  1. Stuff the opening with loose insulation to block dust
  2. Cut the pipe at the wall and remove the whole section
  3. Leave the penetration open so the pipe can move freely during removal
  4. Seal the penetration around the pipe with plastic and tape before removal begins Correct answer.

Explanation

Wall penetrations are sealed around the pipe so the containment envelope stays intact while material is removed. Leaving it open or loosely plugging it allows fibers to migrate into the wall cavity.

Question 44Asbestos Abatement Work Practices and Procedures

What is the recommended practice for cleaning up debris at the end of a removal shift?

  1. Wet-wipe and HEPA-vacuum surfaces, then bag debris for disposal Correct answer.
  2. Blow debris into a corner with compressed air for later pickup
  3. Dry-sweep the floor and shovel debris into open drums
  4. Rinse surfaces with a hose and let water drain to the floor drain

Explanation

Wet wiping and HEPA vacuuming remove dust without re-suspending fibers, and debris is bagged for disposal. Dry sweeping, hosing to drains, and compressed air all spread contamination.

Question 45Asbestos Abatement Work Practices and Procedures

A project monitor observes that the decontamination unit's clean room floor is visibly dirty with tracked material. What is the most appropriate response?

  1. Cover the dirt with a new sheet of plastic and continue
  2. Halt use of the unit and clean and re-establish the clean room before workers pass through Correct answer.
  3. Allow workers to continue since the dirt is outside the containment
  4. Post a sign asking workers to wipe their feet

Explanation

The clean room must remain free of contamination, so a contaminated clean room is cleaned and restored before further use. Covering or ignoring the condition allows fibers to spread outside the work area.

Question 46Asbestos Abatement Work Practices and Procedures

A crew plans to remove asbestos-containing material from a room with a raised access floor. Which approach best addresses the concealed space below the floor panels?

  1. Vacuum the underfloor space with a standard shop vacuum after removal
  2. Leave the underfloor space open to provide makeup air for the containment
  3. Remove the panels last so debris can fall into the underfloor space
  4. Treat the underfloor space as part of the containment and seal or isolate it before removal Correct answer.

Explanation

Concealed plenum spaces can carry fibers to other areas, so they are brought into the containment or isolated before work begins. Using them for makeup air or cleaning with non-HEPA equipment spreads contamination.

Question 47Asbestos Abatement Work Practices and Procedures

During removal of asbestos-containing boiler insulation, a worker's supplied-air respirator hose becomes disconnected inside the containment. What is the correct immediate action?

  1. Continue working while holding the hose end near the face
  2. Leave the work area through the decontamination unit and do not re-enter until the air supply is restored Correct answer.
  3. Tape the hose connection and resume work without reporting it
  4. Switch to a dust mask and finish the current task

Explanation

Loss of breathing air is an immediate hazard, so the worker exits the work area and the system is repaired before re-entry. Improvising respiratory protection or continuing without air is unsafe.

Question 48Asbestos Abatement Work Practices and Procedures

A supervisor is planning removal of asbestos-containing material from a mechanical room containing both friable pipe insulation and non-friable gaskets. Which planning principle best reflects accepted practice?

  1. Remove the most friable material first and sequence work to keep remaining material wet and undisturbed Correct answer.
  2. Remove non-friable material first so the friable material stays intact longer
  3. Defer all removal until the end of the project to reduce handling
  4. Perform all removal simultaneously to shorten the project duration

Explanation

Sequencing friable material first, while keeping it wet and minimizing disturbance of what remains, reduces overall fiber release. Simultaneous work and deferral increase handling and disturbance.

Question 49Asbestos Abatement Work Practices and Procedures

A worker is removing asbestos-containing roofing mastic from a flat roof with a power grinder. Which control combination is most appropriate?

  1. Use the grinder dry with a dust mask and work downwind
  2. Wet the surface and use a standard shop vacuum for dust collection
  3. Grind dry and rely on wind to carry dust away from the work area
  4. Wet the surface, use a HEPA-equipped grinder with local exhaust, and wear appropriate respiratory protection Correct answer.

Explanation

Wetting, HEPA local exhaust at the point of generation, and proper respiratory protection together control dust from powered removal. Dry grinding and non-HEPA collection release fibers.

Question 50Asbestos Abatement Work Practices and Procedures

A worker is preparing to remove a section of asbestos-containing material that is tightly bonded to a concrete substrate and cannot be wetted effectively. Which approach is most appropriate?

  1. Proceed dry and increase the removal speed to finish before dust spreads
  2. Break the material into small pieces to speed removal and reduce handling
  3. Soak the area with a hose and let runoff collect on the floor
  4. Use localized wetting and HEPA vacuuming at the point of removal and avoid breaking the material into small pieces Correct answer.

Explanation

When material cannot be thoroughly wetted, localized wetting combined with HEPA vacuuming at the point of generation and careful handling limits fiber release. Excess water, speed, and fragmentation increase contamination.