A plumber is preparing to enter a large underground stormwater vault for inspection. The vault has limited entry/exit, poor ventilation, and may contain standing water. Which of the following is the most appropriate initial step before entry?
- APerform atmospheric testing and establish a permit-required confined space entry program.
- BVentilate the space for at least 30 minutes and then enter.
- CPump out the standing water and then use a portable fan.
- DDon a full-face respirator and descend quickly.
Show answer & explanationAnswer & explanation
Correct answer: A. Perform atmospheric testing and establish a permit-required confined space entry program.
The description (limited entry/exit, poor ventilation, potential hazards) clearly defines a permit-required confined space. OSHA regulations (29 CFR 1910.146) mandate atmospheric testing for oxygen, flammable gases, and toxic substances before entry, and the establishment of a full permit-required confined space entry program, including attendants, rescue plans, and proper documentation, before any personnel can enter.
Why the other options are wrong
- B. While ventilation is often necessary, it should only occur after initial atmospheric testing to understand the hazards, and it's part of a broader permit program, not the first step.
- C. Removing water and using a fan are hazard control measures, but the absolute first step for a confined space is atmospheric testing and establishing a permit-required entry system.
- D. Entering without prior atmospheric testing is extremely hazardous, as a respirator alone may not protect against all potential atmospheric dangers or oxygen deficiency.
Permit-Required Confined Space Entry
A confined space (limited entry/exit, not for continuous occupancy) with one or more recognized hazards (e.g., atmospheric, engulfment, entrapment).
- Requires written permit program
- Mandatory atmospheric testing (O2, flammables, toxics)
- Requires attendant, entry supervisor, and authorized entrants
- Rescue plan and equipment must be in place
Memory trick: Permit, Test, Ventilate, Enter: Stay Safe, Don't Hesitate!