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NV Asbestos Abatement practice questions

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Question 1Removal of Asbestos (Classification A-23 scope of work)

Before beginning removal work in a regulated area, what must be posted at each entry point to warn occupants and workers?

  1. A fire evacuation floor plan
  2. A list of employee home addresses
  3. A copy of the building occupancy permit
  4. A warning sign with the required asbestos hazard legend Correct answer.

Explanation

Regulations require clearly legible warning signs at each entry to a regulated area, bearing the standard asbestos hazard wording, so anyone approaching knows contamination is present. The sign must remain posted for the duration of the work, not just at start-up.

Question 2Removal of Asbestos (Classification A-23 scope of work)

Which practice is required when removing asbestos-containing floor tile so that breakage is minimized?

  1. Chipping tiles loose with a hammer
  2. Wetting the material and lifting tiles intact Correct answer.
  3. Prying tiles dry with a stiff scraper
  4. Shattering tiles to speed removal

Explanation

Wetting the material and keeping tiles whole limits fiber release; intact tiles can be bagged directly. Dry prying, hammering, or deliberate breakage creates dust and is prohibited under work-practice standards.

Question 3Removal of Asbestos (Classification A-23 scope of work)

What is the purpose of a negative-pressure enclosure during Class I asbestos removal?

  1. To keep the work area warmer than adjacent spaces
  2. To reduce noise from vacuum equipment
  3. To speed drying of the amended water
  4. To prevent fiber migration into occupied areas Correct answer.

Explanation

Exhausting filtered air from the enclosure keeps it under negative pressure relative to surrounding spaces, so air leaks inward rather than carrying fibers outward. Pressure differentials must be monitored and maintained throughout the shift.

Question 4Removal of Asbestos (Classification A-23 scope of work)

Which type of respirator is typically required for Class I removal work involving thermal system insulation?

  1. No respirator if the worker stays outside the enclosure
  2. A tight-fitting half-mask with P100 filters or a supplied-air respirator, per assessment Correct answer.
  3. A loose surgical mask
  4. A single-strap dust mask

Explanation

Class I work can generate high fiber concentrations, so a tight-fitting respirator with high-efficiency particulate filters or supplied air is assigned based on exposure assessment. Surgical masks and dust masks provide no meaningful protection against asbestos fibers.

Question 5Removal of Asbestos (Classification A-23 scope of work)

After removal is complete, how should debris and bagged waste be moved out of a containment?

  1. Dragged along the floor through the clean room
  2. Tossed through a window to a truck below
  3. Carried through the decontamination unit or a waste pass-through after bag exteriors are cleaned Correct answer.
  4. Passed through the shower while still wet with amended water

Explanation

Waste leaves through a decontamination sequence or dedicated waste pass-through, and bag exteriors are wet-wiped or otherwise decontaminated first. This prevents contamination of clean areas and the route to the disposal vehicle.

Question 6Removal of Asbestos (Classification A-23 scope of work)

Which document must accompany asbestos waste to the disposal site?

  1. A shipping manifest or waste shipment record Correct answer.
  2. A material safety data sheet for the building
  3. The employee training roster
  4. The contractor's insurance certificate

Explanation

Asbestos waste is tracked with a manifest or waste shipment record identifying generator, transporter, and disposal site, and a copy is returned after receipt. This chain-of-custody documentation is separate from building or employment records.

Question 7Removal of Asbestos (Classification A-23 scope of work)

What must be done before an employee enters a decontamination unit's shower room from the equipment room?

  1. Remove the respirator only after the disposable suit is removed, following the posted sequence Correct answer.
  2. Rinse the respirator in the shower drain
  3. Leave the respirator on the floor of the clean room
  4. Keep all protective equipment on through the shower

Explanation

Decontamination follows a set sequence: gross contamination is removed in the equipment room, the suit is removed, and the respirator comes off last, typically after showering or in the clean room per the site plan. Following the posted sequence prevents self-contamination.

Question 8Removal of Asbestos (Classification A-23 scope of work)

Why is amended water used during asbestos removal?

  1. It wets fibers so they clump and release less dust Correct answer.
  2. It bleaches the material for inspection
  3. It dissolves asbestos fibers completely
  4. It hardens mastic for easier scraping

Explanation

Surfactant-amended water lowers surface tension so it penetrates and wets the material, causing fibers to agglomerate and stay out of the air. It does not destroy fibers or chemically alter them into a nonhazardous form.

Question 9Removal of Asbestos (Classification A-23 scope of work)

A worker is removing sprayed-on fireproofing from structural beams. Which removal classification applies?

  1. Class II
  2. Class I Correct answer.
  3. Class III
  4. Class IV

Explanation

Sprayed-on or troweled-on surfacing material on structural members is a Class I material, and its removal is Class I work. Class II covers other than surfacing and TSI, Class III is repair and maintenance, and Class IV is cleanup.

Question 10Removal of Asbestos (Classification A-23 scope of work)

Which step best demonstrates that a containment has passed visual clearance before final air sampling?

  1. The exhaust fan has run for one hour
  2. The supervisor confirms that no visible dust or debris remains on surfaces, ledges, and the floor Correct answer.
  3. The negative pressure gauge reads zero
  4. The waste bags have been counted

Explanation

Visual clearance requires a thorough inspection confirming that no visible residue remains on surfaces, ledges, and the floor after cleaning. Only after visual clearance passes is final air sampling conducted; a zero pressure reading would actually signal a containment failure.

Question 11Removal of Asbestos (Classification A-23 scope of work)

During glove bag removal of insulation from a pipe, the bag tears and material falls to the floor. What is the correct immediate action?

  1. Stop work, seal or replace the bag, and clean up the released material with wet methods and HEPA vacuuming Correct answer.
  2. Cover the debris with a plastic sheet and resume work above it
  3. Continue and note the tear at the end of the shift
  4. Spray the debris with water and leave it until final cleanup

Explanation

A breach means fibers may have escaped, so work stops, the bag is sealed or replaced, and released material is cleaned by wet wiping and HEPA vacuuming. Leaving debris in place risks spreading contamination and fails the requirement to control releases immediately.

Question 12Removal of Asbestos (Classification A-23 scope of work)

What is the minimum required frequency for monitoring the pressure differential of a negative-pressure enclosure during active removal?

  1. Once at the start of the project
  2. After the project is complete
  3. Continuously or at frequent documented intervals throughout the shift Correct answer.
  4. Only when a worker reports a draft

Explanation

Pressure differentials must be watched continuously or checked and recorded at frequent intervals during the shift, because a loss of negative pressure means fibers can escape. Records also support clearance decisions and regulatory compliance.

Question 13Removal of Asbestos (Classification A-23 scope of work)

Which practice correctly protects a worker handling asbestos-containing gaskets during valve maintenance?

  1. Wetting the gasket and using hand tools with local exhaust or HEPA vacuum attachment Correct answer.
  2. Burning the gasket residue off the flange
  3. Snapping the gasket off and dropping it into an open bucket
  4. Removing the gasket dry with a power grinder

Explanation

Wetting the gasket and using hand tools with HEPA vacuum or local exhaust minimizes fiber release during maintenance. Power grinding, snapping, and burning all create dust or airborne fibers and are unacceptable methods.

Question 14Removal of Asbestos (Classification A-23 scope of work)

Which factor most directly determines the level of worker protection specified in the written respiratory protection program for removal work?

  1. The exposure assessment and assigned protection factor of the selected respirator Correct answer.
  2. The color of the containment plastic
  3. The number of windows in the building
  4. The contractor's years in business

Explanation

Respirator selection follows the exposure assessment, which estimates airborne fiber levels for the task, and the assigned protection factor of each respirator class. Cosmetic or business factors have no bearing on protection level.

Question 15Removal of Asbestos (Classification A-23 scope of work)

A small amount of asbestos-containing ceiling tile debris is found after a maintenance task. Which activity class covers cleanup of this debris?

  1. Class I
  2. Class IV Correct answer.
  3. Class II
  4. Class III

Explanation

Class IV covers cleanup of small amounts of waste and debris from Class I, II, or III work, as well as maintenance of intact ACM. Full removal of surfacing or TSI would instead be Class I.

Question 16Removal of Asbestos (Classification A-23 scope of work)

Which method is appropriate for cleaning the plastic walls of a containment before clearance?

  1. Wet wiping and HEPA vacuuming Correct answer.
  2. Dry sweeping with a push broom
  3. Shaking the plastic from outside
  4. Compressed-air blowdown

Explanation

Wet wiping and HEPA vacuuming remove settled dust without re-entraining fibers. Dry sweeping, compressed air, and shaking the plastic all resuspend fibers and can fail visual clearance and air sampling.

Question 17Removal of Asbestos (Classification A-23 scope of work)

What is the purpose of the critical barrier in a decontamination unit?

  1. To measure air pressure only
  2. To store clean respirators
  3. To lock workers inside the containment
  4. To separate the equipment room from the work area so contamination does not pass into cleaner zones Correct answer.

Explanation

A critical barrier marks the boundary between the dirty equipment room and cleaner stages, preventing contamination from migrating into the shower and clean room. It is a physical separation, not a locking or storage device.

Question 18Removal of Asbestos (Classification A-23 scope of work)

Which condition would most likely invalidate final air samples collected after removal?

  1. Samples shipped to an accredited laboratory
  2. Sampling performed while aggressive air movement is still running in the containment Correct answer.
  3. Sampling pumps calibrated before use
  4. Sampling conducted after visual clearance passed

Explanation

Final clearance samples must reflect settled conditions; aggressive air movement or fans left running can artificially resuspend fibers and invalidate results. Calibration, post-visual-clearance timing, and accredited analysis all support valid sampling.

Question 19Removal of Asbestos (Classification A-23 scope of work)

A contractor plans to remove asbestos-containing roofing mastic with a grinder. What is the correct program response?

  1. Permit grinding if workers wear surgical masks
  2. Allow grinding only at the end of the day
  3. Approve the grinder because roofing is outdoors
  4. Require a wet method or other dust-suppression approach and prohibit uncontrolled grinding Correct answer.

Explanation

Uncontrolled grinding of asbestos-containing mastic releases fibers regardless of being outdoors, so the plan must use wet methods or other engineering controls and prohibit dry grinding. Outdoor location and time of day do not exempt the work.

Question 20Removal of Asbestos (Classification A-23 scope of work)

Which statement correctly describes handling of asbestos-containing ductwork during removal?

  1. Ducts are left in place and painted over
  2. Duct sections are sealed in plastic while wet and lowered carefully Correct answer.
  3. Duct sections may be dropped to the floor to break them apart
  4. Ducts are cut with a saw without suppression

Explanation

Duct sections should be wetted, wrapped or bagged while intact, and lowered carefully to avoid crushing and fiber release. Breaking, dry sawing, or merely painting over ducts does not constitute removal and can spread contamination.

Question 21Removal of Asbestos (Classification A-23 scope of work)

During a Class I job, a worker's supplied-air respirator loses air supply. What is the required immediate action?

  1. Continue working until the next break
  2. Leave the regulated area through the decontamination unit and report the failure Correct answer.
  3. Remove the respirator inside the containment and keep working
  4. Switch to a surgical mask and finish the task

Explanation

Loss of air supply means the respirator is no longer protective, so the worker must exit the regulated area and report the failure for repair or replacement. Continuing work, removing the respirator inside the containment, or substituting a surgical mask all expose the worker to fibers.

Question 22Removal of Asbestos (Classification A-23 scope of work)

Which set of conditions best supports a decision that a containment is ready for final air sampling?

  1. Workers are still removing the last few feet of TSI
  2. Visual clearance passed, surfaces are dry, and the enclosure has been cleaned and allowed to settle Correct answer.
  3. Waste bags remain inside and fans are running at full speed
  4. The enclosure was just erected and never used

Explanation

Final sampling follows successful visual clearance, cleaning, and a settling period with surfaces dry and no active disturbance. Ongoing removal, running fans, or leftover waste would resuspend fibers and produce invalid results.

Question 23Removal of Asbestos (Classification A-23 scope of work)

A project involves removing both TSI and floor tile in the same regulated area. How should the work be sequenced to control exposure?

  1. Remove both simultaneously with one worker
  2. Remove TSI dry to save time before tile work
  3. Complete the higher-exposure TSI removal under full controls, then address lower-exposure materials within the same managed enclosure Correct answer.
  4. Remove floor tile first, then TSI, without changing containment

Explanation

Higher-exposure tasks such as TSI removal should be completed first under full controls, with lower-exposure materials handled afterward within the managed enclosure. Simultaneous work or dry removal increases airborne fiber levels and complicates decontamination.

Question 24Removal of Asbestos (Classification A-23 scope of work)

A supervisor wants to reduce containment exhaust to save filter life while removal is ongoing. What is the correct evaluation?

  1. Reject it only if workers complain
  2. Approve it only on Fridays
  3. Approve it because filter cost matters more than pressure
  4. Reject it because maintaining negative pressure is required to prevent fiber migration Correct answer.

Explanation

Negative pressure must be maintained throughout removal; reducing exhaust risks losing the pressure differential and allowing fibers to escape. Cost savings and worker complaints are not valid bases for compromising containment.

Question 25Removal of Asbestos (Classification A-23 scope of work)

Which observation during a walkthrough most strongly suggests a decontamination unit is functioning improperly?

  1. The clean room floor is dry and free of debris
  2. There is visible dust tracked into the clean room and the shower drain is clogged Correct answer.
  3. The equipment room contains labeled waste bags
  4. A pressure gauge is mounted outside the enclosure

Explanation

Dust in the clean room and a clogged shower indicate contamination is crossing the critical barrier and that decontamination cannot proceed properly. Dry clean floors, labeled waste, and external gauges are normal or acceptable conditions.

Question 26Removal of Asbestos (Classification A-23 scope of work)

Under the Nevada asbestos regulations, which work practice is required when removing asbestos-containing floor tile with a mechanical chipping hammer inside a regulated area?

  1. Dry-chip the tile quickly so fragments fall directly into disposal bags
  2. Keep the material wet and use HEPA-equipped local exhaust ventilation at the point of removal Correct answer.
  3. Use a high-speed grinder to reduce tile to dust for easier bagging
  4. Spray the debris with compressed air to move it toward the containment exit

Explanation

Mechanical removal of asbestos-containing flooring must control fiber release by wetting the material and capturing dust at the source with HEPA-filtered exhaust ventilation. Dry chipping, grinding, or compressed-air cleaning disperses fibers and is prohibited. The goal is to keep fibers bound in the matrix and capture any that become airborne.

Question 27Removal of Asbestos (Classification A-23 scope of work)

A crew is removing asbestos-containing pipe insulation and must lower the material to the floor from an elevated work area. Which practice keeps the regulated area controlled?

  1. Toss the bundles down and sweep the floor at the end of the shift
  2. Push the material over the edge and hose it down afterward
  3. Drop the wrapped bundles into a designated chute or lower them by rope to a controlled drop zone Correct answer.
  4. Carry unwrapped insulation through occupied spaces to the dumpster

Explanation

Debris removed from height must be lowered in a controlled manner, such as a chute or rope, into a designated drop zone inside the regulated area. This prevents fibers from spreading to uncontrolled areas and avoids breakage of wrapped bundles. Unwrapped transport through occupied spaces would contaminate those spaces.

Question 28Removal of Asbestos (Classification A-23 scope of work)

Which personal protective equipment item must be worn by workers inside a Class I regulated area in addition to respiratory protection?

  1. A hard hat only
  2. Standard work clothes with no coveralls
  3. Steel-toed boots with no other covering
  4. Disposable protective clothing covering the head and body Correct answer.

Explanation

Workers in regulated areas must wear full-body disposable protective clothing, including head and foot covering, to prevent fibers from contaminating street clothes and being carried out. Respiratory protection alone does not prevent take-home contamination. Street clothes must not be worn into the regulated area.

Question 29Removal of Asbestos (Classification A-23 scope of work)

What is the correct action when a worker inside a containment discovers that the HEPA vacuum being used for cleanup has a torn filter gasket?

  1. Switch to a shop vacuum with a standard filter
  2. Stop using it, tag it out of service, and replace or repair it before further cleanup Correct answer.
  3. Continue using it but increase the number of passes over each surface
  4. Wet-wipe the vacuum exterior and keep working

Explanation

A HEPA vacuum with a damaged filter seal can exhaust fibers back into the containment, defeating cleanup. It must be removed from service and repaired or replaced before use continues. Ordinary shop vacuums are not acceptable because they do not retain fibers at HEPA efficiency.

Question 30Removal of Asbestos (Classification A-23 scope of work)

Before removal begins, how should the regulated area boundary be marked?

  1. With a single sign placed at the building entrance
  2. With warning signs and barriers that restrict entry to authorized, trained workers Correct answer.
  3. With tape placed only around the waste storage area
  4. By verbal instruction to the crew only

Explanation

Regulated areas must be demarcated with warning signs and physical barriers that limit access to authorized personnel who are trained and equipped for the hazard. Signs at a distant building entrance do not define the boundary. Verbal-only or waste-area-only marking leaves the work zone unmarked.

Question 31Removal of Asbestos (Classification A-23 scope of work)

Which practice is required when bagging asbestos-containing debris for disposal?

  1. Place debris in labeled leak-tight bags and seal each bag before moving it Correct answer.
  2. Fill bags to bursting so fewer bags are needed
  3. Use unlabeled bags to save time
  4. Leave bags open until the end of the shift

Explanation

Asbestos waste must be placed in leak-tight containers that are labeled with the required warning information and sealed before transport. Overfilling risks rupture and fiber release. Open or unlabeled bags allow release and fail labeling requirements.

Question 32Removal of Asbestos (Classification A-23 scope of work)

What is the purpose of establishing a clean room, a shower, and an equipment room in sequence at a removal project?

  1. To store unused asbestos-containing material
  2. To create a graded decontamination path that removes contamination before a worker leaves the regulated area Correct answer.
  3. To provide lunch and break space for the crew
  4. To house the project office and records

Explanation

The decontamination unit is arranged so a worker moves from the dirty equipment room through the shower to the clean room, removing contamination at each stage. This sequence prevents fibers from being carried into clean areas. It is a contamination-control system, not a support or storage space.

Question 33Removal of Asbestos (Classification A-23 scope of work)

Which action is required when a removal project is completed and the containment is being dismantled?

  1. Pull down the plastic sheeting quickly to save labor
  2. Leave the plastic sheeting in place for the next project
  3. Burn the plastic sheeting on site
  4. Clean all surfaces and the decontamination unit, then remove plastic sheeting carefully as wrapped waste Correct answer.

Explanation

Dismantling requires that surfaces and the decontamination unit be cleaned first, then the plastic sheeting removed carefully and bagged as contaminated waste. Rapid removal would release settled fibers. Leaving the sheeting in place or burning it is not acceptable disposal.

Question 34Removal of Asbestos (Classification A-23 scope of work)

A worker is removing asbestos-containing boiler insulation and finds that the material is friable and crumbling. Which control approach is most appropriate?

  1. Use a fan to blow dust away from the worker
  2. Break the material off dry and let it fall into an open drum
  3. Use wet methods and glove bag or mini-enclosure techniques to keep the material contained during removal Correct answer.
  4. Cut the insulation with a power saw without wetting

Explanation

Friable insulation that crumbles easily releases fibers readily, so removal must use wet methods combined with glove bag or mini-enclosure containment. Dry breakage, fans, and dry power cutting all disperse fibers into the work area. The control must keep fibers contained at the point of removal.

Question 35Removal of Asbestos (Classification A-23 scope of work)

During a Class I removal, a worker notices that the plastic on the containment floor has been torn, exposing the underlying surface. What is the correct response?

  1. Continue working and cover the tear with debris
  2. Wet the exposed floor once and keep working
  3. Stop work in the affected area, clean and patch the floor plastic, and verify the repair before resuming Correct answer.
  4. Ignore the tear because the floor is not a barrier

Explanation

A torn floor covering breaches the containment barrier and allows contamination of the underlying surface. Work in the area should stop while the tear is cleaned and patched, and the repair verified before removal resumes. Covering with debris or a single wetting does not restore the barrier.

Question 36Removal of Asbestos (Classification A-23 scope of work)

A contractor plans to remove asbestos-containing ceiling texture using a wet-scraping method. Which condition must be met for the wetting to be effective?

  1. The material must be thoroughly saturated so it remains wet throughout removal and handling Correct answer.
  2. The material should be misted lightly once at the start
  3. The material should be allowed to dry before bagging
  4. Water should be applied only after the material is bagged

Explanation

Wet methods work only when the material is saturated enough to stay wet through removal, handling, and bagging, keeping fibers bound. A single light mist or wetting after bagging does not suppress fiber release. Allowing the material to dry before bagging defeats the purpose.

Question 37Removal of Asbestos (Classification A-23 scope of work)

A project removes asbestos-containing material from a school during occupied hours. Which scheduling approach best protects building occupants?

  1. Run removal during class changes to save time
  2. Keep the HVAC running normally to dilute fibers
  3. Remove material during lunch so students can watch
  4. Perform removal when the area is unoccupied and isolate the HVAC system serving the work area Correct answer.

Explanation

Removal in occupied buildings should be scheduled when the affected area is unoccupied, and the HVAC system serving the area must be isolated or controlled to prevent fibers from spreading. Working during class changes or allowing occupants to observe increases exposure. Dilution by HVAC is not a substitute for containment.

Question 38Removal of Asbestos (Classification A-23 scope of work)

Which practice is correct for removing an asbestos-containing gasket from a flanged pipe connection?

  1. Wet the gasket, remove it carefully to avoid breakage, and place it directly into a labeled bag Correct answer.
  2. Break the gasket into small pieces to speed disposal
  3. Scrape the gasket dry with a putty knife and let fragments fall
  4. Grind the gasket off with a wire wheel

Explanation

Gasket removal should keep the material wet and intact as much as possible, with pieces placed directly into a labeled container. Dry scraping, grinding, or breaking the gasket generates airborne fibers. Careful removal minimizes the amount of friable debris created.

Question 39Removal of Asbestos (Classification A-23 scope of work)

A supervisor is planning removal of asbestos-containing roofing material. Which control measure is essential before any material is disturbed?

  1. Remove roofing on a windy day to disperse dust
  2. Skip containment because the work is outdoors
  3. Establish a regulated area with containment and use wet methods during removal Correct answer.
  4. Use dry cutting to speed the job

Explanation

Even outdoor roofing removal requires a regulated area with containment and wet methods to prevent fiber release to the environment and to workers. Windy conditions increase dispersion and should be avoided. Dry cutting and skipping containment both release fibers uncontrolled.

Question 40Removal of Asbestos (Classification A-23 scope of work)

During removal, a worker's respirator becomes dislodged and the worker is briefly exposed inside the containment. What should happen next?

  1. The worker should exit through the decontamination unit, wash, and be evaluated before re-entering Correct answer.
  2. The worker should stay in the containment and finish the shift
  3. The worker should remove protective clothing inside the containment and shake it out
  4. The worker should re-enter immediately without cleaning

Explanation

A worker with a dislodged respirator has likely been exposed and must leave through the decontamination unit, shower, and be evaluated before any re-entry. Staying in the containment or re-entering without cleaning prolongs exposure. Removing and shaking clothing inside the containment spreads fibers.

Question 41Removal of Asbestos (Classification A-23 scope of work)

Which practice correctly handles asbestos-containing ductwork that must be removed from a building?

  1. Crush the duct in place to fit it into bags
  2. Drag the duct through occupied corridors
  3. Cut the duct with a saw without wetting
  4. Seal openings, wrap the duct section, and lower it intact to avoid crushing Correct answer.

Explanation

Ductwork should be sealed at openings and wrapped so it can be lowered intact, preventing the release of fibers from interior surfaces. Crushing, dry saw cutting, or dragging through occupied spaces disperses fibers. Keeping the duct intact preserves the containment of contaminated surfaces.

Question 42Removal of Asbestos (Classification A-23 scope of work)

A crew is removing asbestos-containing wallboard in a small room. Which combination best limits fiber migration to the rest of the building?

  1. Open windows for cross-ventilation
  2. Positive pressure inside the room to push air outward
  3. A single layer of plastic on the floor only
  4. Critical barriers over openings and a negative-pressure enclosure with HEPA exhaust Correct answer.

Explanation

Critical barriers seal openings such as doors, windows, and vents, and a negative-pressure enclosure with HEPA exhaust keeps air flowing into the work area so fibers do not escape. Cross-ventilation, floor-only plastic, or positive pressure would push contamination outward.

Question 43Removal of Asbestos (Classification A-23 scope of work)

Which action is required before a worker enters the equipment room of a decontamination unit from the regulated area?

  1. Put on street clothes for the trip home
  2. Eat a snack to maintain energy
  3. Store tools in the shower stall
  4. Remove contaminated protective clothing and clean it or dispose of it as waste Correct answer.

Explanation

The equipment room is the first stage of decontamination, where contaminated protective clothing is removed and either cleaned or discarded as waste before the worker proceeds to the shower. Street clothes, food, and tool storage do not belong in this contamination-control sequence.

Question 44Removal of Asbestos (Classification A-23 scope of work)

A contractor is removing asbestos-containing mastic from a concrete floor with a grinder. Which program response is required?

  1. Continue grinding but wear a dust mask
  2. Wet the floor only after grinding is complete
  3. Grind faster to finish before dust builds up
  4. Stop the dry grinding and switch to a wet method or HEPA-shrouded equipment with containment Correct answer.

Explanation

Dry grinding of asbestos-containing mastic is a high-release activity and must be stopped in favor of wet methods or HEPA-shrouded equipment inside containment. A dust mask is not adequate respiratory protection, and speed or after-the-fact wetting does not control the release.

Question 45Removal of Asbestos (Classification A-23 scope of work)

Which factor determines whether a removal activity falls within Class I work under the asbestos standards?

  1. Whether the work occurs outdoors
  2. Whether the building is residential
  3. Whether the activity involves removal of thermal system insulation or surfacing material Correct answer.
  4. Whether the material is painted

Explanation

Class I work covers removal of thermal system insulation and surfacing material, which are the most friable and hazardous categories. Location, building type, and surface finish do not define the class. The classification drives the level of control and protection required.

Question 46Removal of Asbestos (Classification A-23 scope of work)

A crew plans to remove asbestos-containing fireproofing from steel beams using a dry vacuum-assisted method without wetting. What is the correct supervisory decision?

  1. Approve the plan because a vacuum is used
  2. Approve the plan if workers wear half-mask respirators
  3. Approve the plan only for night shifts
  4. Require wet methods and containment before removal proceeds Correct answer.

Explanation

Sprayed-on fireproofing is friable surfacing material, and removal requires wet methods inside containment regardless of vacuum use. A vacuum alone does not replace wetting and containment, and respirator type or shift timing does not make a dry method acceptable.

Question 47Removal of Asbestos (Classification A-23 scope of work)

During a large removal project, the project monitor observes visible dust leaving the containment through a seam in the plastic. Which analysis best identifies the underlying control failure?

  1. The waste bags are labeled incorrectly
  2. The enclosure is not maintaining negative pressure or the seam was not sealed, allowing contaminated air to escape Correct answer.
  3. The HEPA filters are working too well
  4. The workers are wearing too much protective clothing

Explanation

Visible dust escaping at a seam indicates either a loss of negative pressure or an unsealed breach in the enclosure, both of which allow contaminated air to leave. Filter performance, protective clothing, and labeling do not cause dust to exit a seam. The fix is to restore negative pressure and seal the breach.

Question 48Removal of Asbestos (Classification A-23 scope of work)

A project involves removing both thermal system insulation and floor tile within the same regulated area. Which sequencing analysis is most defensible?

  1. Remove floor tile after the containment is dismantled
  2. Remove both simultaneously to shorten the schedule
  3. Remove floor tile first because it is less friable
  4. Complete the friable thermal system insulation removal first under full containment, then remove the floor tile before dismantling Correct answer.

Explanation

The more friable thermal system insulation should be removed first under full containment so its fibers are controlled before less friable floor tile work begins. Removing tile first or simultaneously increases the chance that friable fibers will contaminate the tile work and the area. Tile removal after dismantling would occur without containment.

Question 49Removal of Asbestos (Classification A-23 scope of work)

A supervisor proposes reducing containment exhaust airflow to extend HEPA filter life while removal is ongoing. What is the correct evaluation?

  1. Reducing airflow can compromise negative pressure and is not acceptable if pressure differential and capture are lost Correct answer.
  2. Reducing airflow always improves worker protection
  3. Airflow has no effect on containment performance
  4. Filter life is more important than containment pressure

Explanation

Containment exhaust must maintain negative pressure and adequate capture; reducing airflow to save filters can break the pressure differential and allow fibers to escape. Filter life is secondary to containment performance. Airflow directly affects whether the enclosure stays under negative pressure.

Question 50Removal of Asbestos (Classification A-23 scope of work)

An inspector finds that the decontamination unit's clean room shares an unsealed doorway with the equipment room. Which analysis best describes the consequence?

  1. The clean room becomes the regulated area
  2. The unit is more efficient because workers travel less
  3. The decontamination sequence is bypassed, so contamination can move directly from the dirty side to the clean side Correct answer.
  4. The shower becomes unnecessary and can be removed

Explanation

The decontamination unit relies on a graded sequence with the shower between the equipment room and clean room. An unsealed direct doorway bypasses that sequence and allows contamination to pass from the dirty side to the clean side. Efficiency gains do not justify losing the contamination barrier.