SAW Emissions Control & Environmental Compliance 2 — Questions and Answers
Question 1: Which OSHA standard primarily governs permissible exposure limits (PELs) for welding fumes in submerged arc welding operations?
- 29 CFR 1910.1000 (Correct answer)
- 29 CFR 1910.252
- 40 CFR 60 Subpart A
- 29 CFR 1910.134
Correct answer: 29 CFR 1910.1000
29 CFR 1910.1000 establishes OSHA's table Z-1 permissible exposure limits for airborne contaminants including welding fumes.
Question 2: In SAW operations, manganese fume exposure is a critical concern. What is the OSHA PEL for manganese fume (ceiling value)?
- 5 mg/m³
- 1 mg/m³ (Correct answer)
- 0.2 mg/m³
- 0.1 mg/m³
Correct answer: 1 mg/m³
OSHA sets a ceiling value of 1 mg/m³ for manganese fume to prevent neurological damage from overexposure.
Question 3: What does the term 'action level' mean in the context of SAW environmental compliance monitoring?
- The level at which immediate evacuation is required
- One-half of the permissible exposure limit triggering enhanced monitoring (Correct answer)
- The concentration requiring full respirator use
- The threshold requiring facility shutdown
Correct answer: One-half of the permissible exposure limit triggering enhanced monitoring
The action level is typically half the PEL and triggers requirements for increased air monitoring and medical surveillance.
Question 4: Which EPA program requires facilities that release certain toxic chemicals above threshold quantities to report annually?
- Clean Air Act Title V
- Toxic Release Inventory (TRI) under EPCRA Section 313 (Correct answer)
- RCRA Subtitle C
- CERCLA Section 103
Correct answer: Toxic Release Inventory (TRI) under EPCRA Section 313
EPCRA Section 313 requires facilities meeting size and industry criteria to report toxic chemical releases to the EPA's Toxic Release Inventory.
Question 5: During SAW, flux decomposition can produce sulfur dioxide (SO₂). Which EPA standard regulates SO₂ as a criteria air pollutant?
- National Emission Standards for Hazardous Air Pollutants (NESHAP)
- National Ambient Air Quality Standards (NAAQS) (Correct answer)
- New Source Performance Standards (NSPS)
- Maximum Achievable Control Technology (MACT)
Correct answer: National Ambient Air Quality Standards (NAAQS)
NAAQS established under the Clean Air Act sets ambient concentration limits for SO₂ as one of six criteria air pollutants.
Question 6: A SAW facility generates spent flux that tests above EPA hazardous waste thresholds. Under RCRA, this waste must be managed as:
- Universal waste
- Solid non-hazardous waste
- Hazardous waste requiring cradle-to-grave tracking (Correct answer)
- Industrial waste with no special requirements
Correct answer: Hazardous waste requiring cradle-to-grave tracking
RCRA Subtitle C requires cradle-to-grave management of hazardous waste, including proper manifesting, storage limits, and disposal at permitted facilities.
Question 7: What is the primary purpose of a Hazardous Materials Business Plan (HMBP) required in some states for SAW facilities?
- To document welding procedure specifications
- To notify local emergency responders of chemical inventories and emergency procedures (Correct answer)
- To track welder certification renewals
- To record flux purchase history
Correct answer: To notify local emergency responders of chemical inventories and emergency procedures
HMBPs inform local emergency response agencies about hazardous materials on-site so they can plan for potential releases or incidents.
SAW Emissions Control & Environmental Compliance 2
Which OSHA standard primarily governs permissible exposure limits (PELs) for welding fumes in submerged arc welding operations?