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Removing mold-affected wallboard around a leaking window exposes surface growth on the studs. The wood is sound, every affected face is accessible, and there is no decay or loss of section. The leak has been repaired and dust controls are operating. What treatment plan is justified for the studs?
Correct answer: B - Clean the studs with controlled physical methods that remove the adherent growth.
A containment is 30 ft long, 20 ft wide, and 8 ft high. Its work plan requires at least 6 air changes per hour of filtered exhaust to outdoors. The exhaust unit is rated at 600 CFM but delivers a measured 360 CFM through its installed duct. A separate unit recirculates 300 CFM entirely within containment. Using ACH = 60 × exhaust CFM ÷ volume in cubic feet, how should the supervisor evaluate the exhaust requirement?
Correct answer: D - The zone has 4.5 exhaust ACH; at least 120 CFM of additional effective exhaust is needed.
Under an employer's OSHA respiratory-protection program, a mold-demolition task requires a negative-pressure full-face respirator used at an assigned protection factor (APF) of 50. A technician's quantitative fit test produces a fit factor of 420. The technician says, 'That is well above 50, so I passed.' How should the program administrator respond?
Correct answer: A - The full-face fit test requires at least 500; correct the fit and retest before this use.
Within minutes of a backup, clear-looking water is extracted from a restaurant's floor drain. A plumber identifies the source as sanitary waste-line backflow from beyond the drain trap. No visible fecal matter is present. Before selecting procedures for the affected materials, the technician should record the water as:
Correct answer: A - Category 3, because the identified source is waste-line backflow beyond the trap.
A repaired ceiling develops a damp patch again. Above it, droplets form on an uninsulated chilled-water pipe. Room relative humidity is 46%, the measured dew point is 14°C, and the pipe surface is 9°C. A plumbing pressure test finds no leak. Which correction addresses the demonstrated moisture mechanism?
Correct answer: C - Insulate the cold pipe and seal gaps that expose its surface to humid air.
A pinless scan of a gypsum-board wall identifies a narrow vertical band of elevated readings along a metal corner bead. Readings a few inches to either side match comparable unaffected wallboard, and no staining or bulging is visible. Before including wall removal in the scope, the technician should:
Correct answer: B - Check for actual material moisture with suitable pin-type measurements that avoid contact with the metal.
Inspection of an isolated air-handling system finds accessible surface contamination on a bare-metal compartment and mold growth through wet fiberglass return-duct lining. Electrical isolation and exposure controls are in place. The owner requests the least destructive effective treatment. Which component disposition is appropriate?
Correct answer: D - Physically clean the bare metal and replace the affected fiberglass liner.
During a pre-work containment check, a zeroed differential manometer reads +5 Pa. Its high-pressure port is connected to the clean corridor and its low-pressure port is inside containment. The instrument displays high-port pressure minus low-port pressure. A smoke check shows air moving from the corridor into containment. What do these checks indicate?
Correct answer: C - The work zone is 5 Pa below the corridor; the port arrangement explains the positive display.
After an old roof leak is repaired, a concealed paper facing is dry but still has attached fungal growth. A separate shelf carries settled dust traced to disturbance of that facing; examination finds deposited fungal particles but no growth on the shelf. How should the two locations be characterized?
Correct answer: B - The facing remains Condition 3; the shelf has settled contamination consistent with Condition 2.
During sewage cleanup in a below-grade utility vault, a worker becomes dizzy near the access ladder. A recently checked monitor alarms and displays 18.3% oxygen. The worker can still climb out without assistance. A coworker at the opening has a half-mask respirator with P100 filters. What is the immediate priority?
Correct answer: A - Direct the worker out, prevent entry by others, and activate the site's emergency response.
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