Log tasks, timing, and instrument evidence alongside noise results to support a competent assessment.
Key Takeaways * Record tasks performed and areas visited to provide context for noise results, particularly when levels are high. * Distinguish between indicative screening and measured personal exposure; a quick screen does not replace a full assessment. * Keep jurisdiction-specific guidance separate; do not apply Canadian or other foreign thresholds to US sites. * Use the log to help a competent assessor understand the relationship between specific work activities and noise levels.
Canadian workplace-noise measurement guidance advises that the worker should keep a log detailing tasks performed, areas visited, and any other important information that can help with understanding results, especially if noise levels are high, according to CCOHS. It does not generalize to other jurisdictions, equipment types, or tasks.
Why varying tasks and noise periods need a combined assessment
A single spot reading cannot represent a changing shift because noise levels fluctuate as workers move between tasks and equipment. According to Cornell Legal Information Institute, if variations in noise level involve maxima at intervals of 1 second or less, the noise is to be considered continuous.
Impulsive noise presents a different challenge. According to Cornell Legal Information Institute, exposure to impulsive or impact noise should not exceed 140 dB peak sound pressure level. This guidance applies to impulsive or impact noise, which is distinct from continuous noise. A contractor should record whether a task generates impulsive sounds, such as pile driving or demolition impacts, and note the peak levels if measured. The log should separate continuous noise periods from impulsive events to help the assessor evaluate each against the appropriate standard. Mixing these types in a single average reading obscures the risk.
When a shift includes both continuous and impulsive noise, the combined assessment requires tracking both. The log should note the duration of continuous exposure and the occurrence of impulsive events. This helps the competent assessor interpret the exposure record. The contractor’s role is to provide the raw data: task names, start and stop times, and any recorded peak levels. The assessor then applies the regulatory definitions to determine compliance. The log is not a substitute for the assessment; it is the evidence that makes the assessment possible.
Reference table of noise-assessment guidance by publisher
The following table summarizes three distinct regulatory and guidance sources relevant to construction noise assessment. The "Record implication" column offers an editorial suggestion for how a contractor might document this specific requirement in their task log. These recommendations are not statutory forms but practical steps to support a competent assessor.
| Publisher | Jurisdiction/scope | Stated check | Record implication |
|---|---|---|---|
| Cornell Legal Information Institute | United States federal construction standard | Protection against the effects of noise exposure shall be provided when the sound levels exceed those shown in Table D-2 of this section when measured on the A-scale of a standard sound level meter at slow response, according to Cornell Legal Information Institute. | Log the specific A-scale measurement and its comparison with the applicable values. |
| HSE | Great Britain construction noise-assessment guidance | Lower exposure action value – daily or weekly personal noise exposure (LEP,d or LEP,w) of 80dB, according to HSE. | Record the calculated LEP,d or LEP,w for comparison with the applicable action value. |
| CCOHS | Canadian workplace-noise measurement guidance | Sound level meter calibration guidance, according to CCOHS. | Note the calibration check times and results for the sound level meter used during the shift. |
Do not average these thresholds or apply one jurisdiction's limit to another. These are distinct metrics with different applications. The CCOHS rule addresses instrument preparation, not exposure limits. The WorkSafe New Zealand guidance addresses the decision to engage a competent person.
When recording these checks, keep the jurisdiction clear in your log. In New Zealand, note if you have asked a competent person for a detailed assessment due to uncertainty, as advised by WorkSafe New Zealand.
The record implication column suggests how to capture these specific checks. For the US standard, log the measurement and its comparison to Table D-2. For HSE, log the calculated exposure value. For CCOHS, log the calibration evidence. For WorkSafe New Zealand, log the decision to engage a competent person. These are editorial suggestions to help you organize your data for the assessor.
Each publisher's guidance serves a specific purpose within its jurisdiction. The Cornell LII source provides the federal construction standard text. The CCOHS source provides the Canadian measurement protocol. The WorkSafe New Zealand source provides guidance on professional assessment. Keep these separate in your documentation.
How to record task changes, timings and calibration evidence
Record the specific task and work area where the worker is positioned. Note the actual start and stop times for each distinct task segment, rather than relying on the scheduled shift hours. This captures how the worker moves between different noise sources throughout the day.
Document the instrument used for the measurement. For sound level meters, the device must be calibrated before and after each use, according to CCOHS. For personal dosimeters, the dosimeter is to be calibrated before and after each measurement, according to CCOHS. Record the calibration check values in the log to help assess the instrument’s accuracy.
If the calibration is off by more than 0.5 dB after the measurement, resampling may be needed as the results may not be accurate, according to CCOHS. Mark these entries for review so the competent assessor can determine if a repeat measurement is required.
Log the noise result alongside the applicable jurisdiction. Keep United States construction standards, Great Britain guidance, Canadian guidance, and New Zealand guidance separate in the record. Do not mix thresholds from different regions in a single entry. Note which specific standard or guidance document applies to the measurement taken.
Record any control actions implemented during the task. Note if engineering controls, such as barriers or equipment modifications, were used. Log administrative controls, like reduced exposure time or rotation schedules. These details help the assessor evaluate the effectiveness of the controls in reducing the worker’s total exposure.
Use this log to track changes across the shift. When a task changes, start a new entry with the new task name, area, and time. This creates a clear timeline of the worker’s exposure. The log serves as the primary record for the competent assessor to review. It provides the evidence needed to calculate the total daily exposure.
Keep the log organized by worker and date. Include the worker’s name and the date of the assessment. List each task in chronological order. This structure makes it easy to identify periods of high exposure. It also helps in correlating the noise levels with the specific work activities. Use the daily log checklist to organize the wider shift record.
Review the log for completeness before submitting it to the assessor. Check that every task has a corresponding start and stop time. Verify that calibration evidence is present for each instrument used. Ensure that the noise results are clearly linked to the specific task and jurisdiction. This review step helps catch missing information early.
The log is a tool for tracking, not a final determination. It records the data needed for the assessment. The competent assessor uses this data to make the final evaluation. The contractor’s role is to provide accurate and complete records. This supports a thorough and reliable noise assessment.
Illustrative example: record a task change
A worker spends 60 minutes on one task, then changes work area. Start a new entry for the next task. Keep each noise result and calibration record linked to its task; leave unmeasured results blank.
How to flag controls and changes for a competent assessment
When noise levels exceed the limits listed in Table D-2 of the United States federal construction standard, feasible administrative or engineering controls shall be utilized, according to Cornell Legal Information Institute. Record which specific control was applied, such as a change in work rotation or the installation of barriers, and note the time it was implemented. This entry serves as the evidence that the required control action was taken in response to the measured exposure.
In New Zealand, the legal guidance specifies that you must first try to eliminate the source of noise, for example, by removing the noisy machinery from your work, or by choosing quieter equipment, according to WorkSafe New Zealand. Documenting this primary step is critical. If you cannot eliminate the source, the log should detail the subsequent control measures. The record should clearly distinguish between attempts to eliminate the source and other administrative or engineering controls used. This distinction helps the competent assessor understand the hierarchy of controls applied on site.
Shift length significantly impacts how exposure is calculated and assessed. Where shifts are longer than 8 hours, you should engage a competent person to determine the equivalent noise exposure that would occur over 8 hours, according to WorkSafe New Zealand. If your construction schedule involves extended shifts, flag this in the log immediately. Note the actual shift length and the time the competent person was engaged. This helps the assessment account for the full duration of the worker's exposure accurately.
Changes in equipment or tasks that alter the noise profile require immediate documentation. If you swap a noisy machine for a quieter model, record the date, the specific equipment change, and the reason for the swap. If a new task is introduced that generates impulsive noise, note the start and stop times of that task. These entries allow the competent assessor to correlate specific work activities with measured noise levels. Without this context, a noise reading lacks the necessary detail to determine which task caused the exposure. Keep other task checks in their own records, using the portable ladder checks where relevant.
Today, review one task entry for missing times, noise results and calibration evidence before sending it to the assessor.
FAQ: construction noise-assessment logs
What should a worker record while wearing a noise dosimeter?
Record the specific task, work area, and the start and stop times for each period of exposure. The log should also capture the instrument identification and any calibration evidence used during that shift. This helps the data reflect the actual conditions of the work performed rather than a generic estimate.
Can one spot reading represent a whole changing shift?
No, a single spot reading cannot represent a whole changing shift because tasks and noise periods vary throughout the day. Relying on one reading ignores the cumulative exposure that occurs as workers move between areas.
Why must calibration and start and stop times be recorded?
Calibration evidence helps assess measurement accuracy, while start and stop times define the duration of exposure for each task. Without these timestamps, the recorded noise levels cannot be accurately applied to the worker's total shift duration.
Are screening action values and exposure limits interchangeable?
No, action values and exposure limits serve different purposes. For example, the upper exposure action value for daily or weekly personal noise exposure is 85dB, while the lower and upper action values for peak noise are 135 and 137 dB (LCpeak) respectively, according to HSE.
What changes should be raised with the competent assessor?
Raise any changes in task, equipment, or work area that may alter the noise exposure. Manufacturers' noise data should be checked for relevance to the specific work being done, according to HSE. Additionally, note that hearing protection is the least effective control measure and should only be considered after trying to eliminate or minimise the noise risk, according to WorkSafe New Zealand.