Safety Standards & Hazardous Material Handling Flashcards

Which NFPA standard specifically addresses the control of flammable and combustible liquids during demolition operations?

Answer: NFPA 30

NFPA 30 (Flammable and Combustible Liquids Code) governs the handling and storage of these liquids, including during demolition.

A demolition crew finds vermiculite insulation in a building's attic. What is the primary safety concern and required action?

Answer: Presume it contains asbestos and follow asbestos abatement protocols

Vermiculite from Libby, Montana is associated with asbestos contamination; it must be presumed to contain asbestos and handled accordingly.

Under the EPA's RRP Rule, what is the required clearance testing threshold for lead dust on floors after demolition disturbs lead-based paint?

Answer: 40 μg/ft²

EPA's RRP Rule requires post-work floor clearance of 40 μg/ft² or less for lead dust to confirm adequate cleanup.

What type of fire extinguisher is appropriate for a Class D fire involving combustible metal swarf from demolition cutting operations?

Answer: Dry powder extinguisher rated for Class D metals

Class D fires involving combustible metals (e.g., magnesium, titanium) require a dry powder extinguisher specifically rated for Class D fires.

What is the OSHA-required minimum frequency for air monitoring of silica dust when a demolition supervisor establishes that a task is on the Table 1 control list?

Answer: No air monitoring is required if Table 1 controls are fully implemented

OSHA's silica standard allows employers who fully implement Table 1 engineering controls to skip air monitoring for those tasks.

When demolishing a building with a wet sprinkler system, what must be done with the system before structural demolition begins?

Answer: The system must be drained and properly disabled to prevent accidental discharge

Active sprinkler systems must be fully drained and disabled before structural demolition to prevent uncontrolled water discharge that can cause structural instability.

Under OSHA standards, what is the maximum permissible exposure limit (PEL) for mercury vapor in an 8-hour workday?

Answer: 0.05 mg/m³

OSHA sets the PEL for mercury vapor at 0.05 mg/m³ (50 μg/m³) as a ceiling limit for an 8-hour workday.