C33 - C-33 California Painting Contractor License California Painting Contractor Safety 1 — Questions and Answers
Question 1: Under Cal/OSHA, what is the maximum permissible exposure limit (PEL) for lead in the air of a painting worksite over an 8-hour time-weighted average?
- 50 micrograms per cubic meter (μg/m³) (Correct answer)
- 100 micrograms per cubic meter (μg/m³)
- 200 micrograms per cubic meter (μg/m³)
- 25 micrograms per cubic meter (μg/m³)
Correct answer: 50 micrograms per cubic meter (μg/m³)
Cal/OSHA Title 8 Section 1532.1 sets the PEL for lead at 50 μg/m³ as an 8-hour TWA. Contractors disturbing lead-based paint must monitor exposures and implement engineering controls, work practice controls, and PPE when this limit is approached or exceeded.
Question 2: A C-33 contractor assigns workers to sand and scrape exterior paint on a pre-1978 residential building. Before work begins, what action is required under California's lead regulations?
- Conduct initial air monitoring or use historical data to determine employee lead exposure (Correct answer)
- Immediately issue full-face respirators to all workers on site
- Post a lead hazard warning sign at the property perimeter only
- Notify the local fire department before disturbing the paint
Correct answer: Conduct initial air monitoring or use historical data to determine employee lead exposure
Cal/OSHA Title 8 Section 1532.1 requires the employer to determine employee exposure to lead through initial air monitoring or by relying on objective data before disturbing potentially lead-containing coatings. This assessment drives all subsequent controls and PPE decisions.
Question 3: When using a portable ladder on a painting job, Cal/OSHA requires that the ladder be placed so that the horizontal distance from the base to the wall is what fraction of the ladder's working length?
- One-quarter (1:4 ratio) (Correct answer)
- One-third (1:3 ratio)
- One-half (1:2 ratio)
- One-fifth (1:5 ratio)
Correct answer: One-quarter (1:4 ratio)
Cal/OSHA Title 8 Section 3276 specifies the 4:1 rule: for every four feet of ladder height, the base must be placed one foot away from the structure. This angle provides the correct balance between stability at the base and support at the top.
Question 4: A C-33 painting crew is working in a confined space where solvent-based coatings are being applied. Under Cal/OSHA, the atmosphere must be tested for oxygen content before entry. What oxygen concentration range is considered safe for entry?
- 19.5% to 23.5% (Correct answer)
- 16% to 25%
- 18% to 21%
- 21% to 26%
Correct answer: 19.5% to 23.5%
Cal/OSHA Title 8 Section 5157 defines a safe atmosphere in a permit-required confined space as having an oxygen concentration between 19.5% and 23.5%. Below 19.5% is oxygen-deficient and above 23.5% is oxygen-enriched, both creating serious hazards.
Question 5: Under Cal/OSHA's Hazard Communication standard (Title 8 Section 5194), a C-33 contractor must ensure that Safety Data Sheets (SDS) for all hazardous paint products are:
- Readily accessible to employees during each work shift in their work area (Correct answer)
- Kept only at the main office and available upon written employee request
- Submitted to Cal/OSHA before the products are brought to the job site
- Posted on a bulletin board at the job site entrance at all times
Correct answer: Readily accessible to employees during each work shift in their work area
Cal/OSHA's HazCom standard requires that SDS be immediately accessible to employees during their work shift in the area where hazardous chemicals are used. Locking them in an office or keeping them off-site does not satisfy this requirement.
Question 6: A C-33 contractor's employee is spray-painting with a product that contains benzene, a known carcinogen. Under Cal/OSHA, what minimum respiratory protection must be provided when engineering controls alone cannot keep exposure below the PEL?
- A supplied-air respirator (SAR) or self-contained breathing apparatus (SCBA) when exposure exceeds 10 times the PEL (Correct answer)
- A half-face air-purifying respirator with organic vapor cartridges at all exposure levels
- No respirator is required if the work area is outdoors with natural wind
- A dust mask rated N95 is sufficient for any benzene exposure level
Correct answer: A supplied-air respirator (SAR) or self-contained breathing apparatus (SCBA) when exposure exceeds 10 times the PEL
Cal/OSHA Title 8 Section 5218 (Benzene) requires supplied-air respirators or SCBAs when employee benzene exposure exceeds 10 times the PEL and engineering controls cannot reduce exposure further. Air-purifying respirators are only acceptable at lower exposure multiples and cannot be used for immediately dangerous conditions.
C33 - C-33 California Painting Contractor License California Painting Contractor Safety 1
Under Cal/OSHA, what is the maximum permissible exposure limit (PEL) for lead in the air of a painting worksite over an 8-hour time-weighted average?