Utility Vault and Manhole Atmospheric Pre-Entry Test

Pre-entry atmospheric test record for utility vaults and manholes documenting oxygen, LEL, carbon monoxide, and hydrogen sulfide readings at multiple depths before personnel entry.

Inspection Details

• Inspection date and time recorded
• Location identified
  Record the vault/manhole ID, address, utility type, and exact access point.
• Inspector and tester identified
  Record the name and role of the person performing the atmospheric test.

Test Equipment and Calibration

• Gas monitor bump-tested and within calibration
  Confirm the instrument was bump-tested per site procedure and is within the current calibration interval before use.
• Instrument serial number recorded
  Record the serial number or asset ID of the gas monitor used for the test.
• Sampling method and probe length documented
  Document whether a pump, probe, or diffusion method was used and the approximate probe length or sampling setup.

Atmospheric Readings

• Top reading recorded
  Enter the top-of-space readings for oxygen, LEL, carbon monoxide, and hydrogen sulfide.
• Middle reading recorded
  Enter the middle-of-space readings for oxygen, LEL, carbon monoxide, and hydrogen sulfide.
• Bottom reading recorded
  Enter the bottom-of-space readings for oxygen, LEL, carbon monoxide, and hydrogen sulfide.
• Oxygen within acceptable range
  Confirm oxygen concentration is within the site-accepted safe range for entry.
• LEL below entry limit
  Confirm combustible gas concentration is below the site-accepted entry limit.
• Carbon monoxide below entry limit
  Confirm carbon monoxide is below the site-accepted exposure limit for entry.
• Hydrogen sulfide below entry limit
  Confirm hydrogen sulfide is below the site-accepted exposure limit for entry.

Ventilation and Re-Test

• Ventilation in place when required
  Confirm forced air ventilation or other control measures are operating when required by the entry procedure.
• Re-test performed after ventilation or condition change
  Confirm the atmosphere was re-tested after ventilation, weather change, equipment change, or any condition that could affect readings.

Entry Authorization and Sign-Off

• Entry authorized based on test results
  Confirm the space was authorized for entry only after acceptable atmospheric readings were verified.
• Deficiencies and corrective actions documented
  Document any out-of-range readings, ventilation actions, retesting, or entry delays.
• Inspector signature