Manhole and Vault Entry Atmospheric Test Log
Use this log to document pre-entry and ongoing atmospheric testing for manholes and utility vaults treated as permit-required confined spaces. It helps you verify oxygen, combustible gas, and toxic gas conditions before entry and record ventilation and entry controls during the job.
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Overview
This template is an entry log for manholes and utility vaults that are treated as permit-required confined spaces. It captures the inspection details, pre-entry authorization, atmospheric test results, ventilation status, and the corrective actions needed before entry can continue.
Use it when a space may contain oxygen deficiency, combustible gas, or toxic vapors, or when your permit process requires documented verification before and during entry. The structure follows the sequence an inspector or entry supervisor actually uses: identify the space, confirm the permit and isolation steps, test the atmosphere, verify ventilation, and record any deficiencies or non-conformances.
It is not the right template for routine surface inspections, open excavations, or spaces that are not being entered. It also should not replace a full confined-space permit, rescue plan, or hazard assessment; it works best as the testing and control record that supports those documents. If your site uses fixed gas monitors, multiple entrants, or changing work conditions, this log gives you a place to show when readings were taken, what controls were active, and whether entry remained acceptable throughout the job.
Standards & compliance context
- This template supports OSHA confined-space and atmospheric testing expectations for general industry and construction work where manholes and vaults are permit spaces.
- It aligns with ANSI/ASSP confined-space program practices that call for documented testing, ventilation, attendant control, and entry authorization.
- For utility and municipal work, it helps demonstrate that isolation, monitoring, and corrective actions were verified before and during entry.
- If the space may contain flammable vapors or ignition sources, the record supports fire and life safety controls commonly addressed by NFPA-based procedures.
- Where toxic gases are possible, the log should reflect site-specific exposure limits and employer procedures for retesting and stop-work decisions.
General regulatory context for orientation only — verify current requirements with counsel or the relevant agency before relying on this template for compliance.
What's inside this template
Inspection Details
This section anchors the record to one specific space, time, and permit so the test results can be traced to the exact entry event.
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Entry location identified
Record the manhole or vault identifier, address, asset number, or other unique location reference.
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Inspection date and time
Document when the atmospheric test log was completed.
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Inspector / tester name
Name of the qualified person performing the atmospheric test and entry verification.
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Work order or permit number
Record the associated work order, permit, or job control number.
Pre-Entry Conditions
This section confirms the space is controlled as a permit-required confined space before anyone goes inside.
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Space identified as permit-required confined space
Confirm the manhole or vault has been evaluated and controlled as a permit-required confined space where applicable.
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Entry authorization completed before entry
Verify entry authorization, permit approval, and required pre-entry checks were completed before anyone entered.
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Area secured from unauthorized access
Confirm barriers, covers, cones, or other controls are in place to prevent unauthorized entry or exposure.
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Isolation and energy control verified
Confirm applicable lockout-tagout, blanking, disconnect, or other isolation measures are in place before entry.
Atmospheric Testing
This section captures the actual gas readings that determine whether the space is safe enough for entry.
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Initial atmospheric test completed before entry
Verify the atmosphere was tested before any entry into the manhole or vault.
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Oxygen concentration
Record the measured oxygen concentration at the opening and at representative levels in the space.
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Combustible gas reading
Record the combustible gas concentration as a percentage of the lower explosive limit (LEL).
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Toxic gas readings recorded
Select any toxic gases tested for and document the measured values in comments if applicable.
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Atmospheric test results acceptable for entry
Confirm all required readings were within acceptable limits before entry was authorized.
Ventilation and Entry Controls
This section shows whether active controls were in place to keep the atmosphere acceptable during the job.
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Mechanical ventilation in operation
Confirm ventilation equipment is operating when required and air movement is directed to the space as intended.
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Ventilation maintained during entry
Verify ventilation remained in operation throughout entry when required by the permit or site procedure.
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Continuous or periodic monitoring established
Confirm the monitoring frequency or continuous monitor requirement was established and followed during entry.
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Entry controls and attendant in place
Confirm an attendant, communication method, and entry control measures were in place before and during entry.
Deficiencies, Corrective Actions, and Sign-Off
This section documents any non-conformance, the fix applied, and the final approval to proceed or close out the entry.
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Deficiencies or non-conformances documented
Record any unsafe conditions, failed tests, ventilation issues, or entry control deficiencies observed.
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Corrective actions completed before entry continued
Confirm corrective actions were completed and the space was re-tested before entry continued after any deficiency.
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Inspector signature
Signature of the qualified person completing the log.
How to use this template
- Start by identifying the exact manhole or vault, the inspection date and time, and the permit or work order number so the log ties to one specific entry event.
- Confirm that the space is classified as a permit-required confined space, that entry authorization is complete, and that isolation and energy control steps are verified before anyone enters.
- Record initial atmospheric readings before entry for oxygen, combustible gas, and any toxic gases relevant to the site, and note whether the results are acceptable for entry.
- Document that mechanical ventilation is operating, that monitoring will continue during entry, and that an attendant and entry controls are in place.
- If any reading or condition is out of range, stop the entry, describe the deficiency, record the corrective action, and retest before work resumes.
- Finish by signing off only after the space remains acceptable and the record clearly shows who tested, what was found, and what controls were maintained.
Best practices
- Use a calibrated, bump-tested meter and record the device identifier so the reading can be traced to the instrument used.
- Test the atmosphere at the top, middle, and bottom of the space when stratification is possible, not just at the opening.
- Record actual readings and units instead of writing only pass or fail, because a borderline condition can change quickly.
- Keep ventilation running long enough to show stable readings before entry and continue it whenever the permit requires active control.
- Treat any change in conditions, such as new fumes, water intrusion, or equipment exhaust, as a trigger to re-test immediately.
- Assign an attendant who can maintain communication and stop entry if the atmosphere shifts or the permit conditions are no longer met.
- Photograph or attach supporting evidence for deficiencies, such as blocked ventilation, damaged covers, or missing barricades, when your process allows it.
What this template typically catches
Issues teams running this template most often surface in practice:
Common use cases
Frequently asked questions
When should this log be used?
Use it before anyone enters a manhole or utility vault that is treated as a permit-required confined space, and continue using it during the entry if conditions can change. It is especially useful when the space may contain low oxygen, flammable vapors, or toxic gases. If the space is not a confined space or does not require atmospheric verification, this template may be more than you need.
Who should complete the atmospheric test log?
A trained tester, entrant supervisor, or other authorized person should complete it, depending on your program and permit process. The person recording readings should understand the meter, bump-test status, sampling order, and what constitutes an acceptable result. The attendant or entry supervisor should verify that controls are in place before entry continues.
How often should atmospheric readings be taken?
Take initial readings before entry, then repeat them continuously or at a defined interval based on the hazard assessment and permit conditions. If ventilation changes, the space is disturbed, or conditions worsen, re-test immediately. Many programs require more frequent checks when the atmosphere is known to be unstable or when work can release contaminants.
What regulations or standards does this template support?
This log supports confined-space programs under OSHA general industry and construction requirements, along with common industry practices for atmospheric monitoring and entry control. It also aligns with ANSI/ASSP confined-space guidance and utility safety procedures that require documented testing, ventilation, and attendant oversight. Local utility rules or employer permit procedures may add more specific requirements.
What are the most common mistakes this log helps prevent?
Common mistakes include testing only once, skipping oxygen or toxic gas readings, and recording results without documenting ventilation or entry authorization. Another frequent issue is allowing entry to continue after a reading changes without stopping work and reassessing the space. This template makes those gaps visible before they become a non-conformance.
Can this template be customized for different utilities or vault types?
Yes. You can add fields for the specific gas hazards you monitor, meter serial number, calibration date, ventilation equipment used, or the permit issuer for your utility. Many teams also customize it for electric vaults, telecom manholes, stormwater structures, or sewer access points.
How does this compare with an ad hoc checklist or handwritten note?
An ad hoc note often captures only the final reading and misses the chain of controls that make entry defensible. This template ties the test results to the permit, isolation steps, ventilation, and corrective actions so the record shows why entry was allowed. That makes it easier to review, audit, and trend recurring hazards.
What should happen if a reading is out of range?
Entry should stop or not begin until the deficiency is corrected and the space is retested. Typical responses include ventilating the space, rechecking isolation, or escalating to the permit issuer if the hazard cannot be controlled. The log should show the non-conformance, the corrective action taken, and the final acceptable reading before work proceeds.
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