Industrial Hygiene Sampling Plan Audit

It checks whether a sampling plan is ready to support a defensible exposure assessment before samples are collected. The template walks through scope, hazard identification, sampling strategy, calibration, documentation, and how results will be reviewed and shared. It is designed to surface missing exposure limits, weak sampling rationale, and chain-of-custody gaps. It does not replace the sampling plan itself; it audits the plan for completeness and traceability.

Use it before a new exposure assessment, when a process changes, after a chemical substitution, or when prior results were inconclusive. It is also useful when an outside consultant or lab prepares the sampling plan and you need an internal review before execution. If the plan already exists, this audit helps verify that the sampling approach still matches the current task, shift, and employee group. It is less useful for routine housekeeping inspections that do not involve exposure assessment planning.

An EHS professional, industrial hygienist, or trained safety lead should run it, with input from supervisors and the people who do the work. For higher-risk hazards, a competent person or qualified industrial hygienist should confirm the sampling strategy and interpretation basis. The reviewer should understand exposure routes, sample media, and how field conditions affect data quality. If the plan will support compliance decisions, management should assign a clear owner for follow-up actions.

Audit the plan every time it is created or materially revised, and again before field deployment if the work area, task, or shift has changed. For recurring monitoring programs, review the plan on a scheduled basis so it stays aligned with current processes, controls, and exposure criteria. Re-audit after incidents, complaints, process changes, or lab method changes. A stale plan is a common source of invalid or non-representative results.

This template supports industrial hygiene programs aligned with OSHA general industry and construction requirements, as well as recognized industrial hygiene practice under ANSI/ASSP guidance. It also helps teams document exposure assessment decisions in a way that fits broader safety management systems such as ISO 45001 or ANSI/ASSP Z10. Where applicable, it can be used alongside chemical-specific guidance from CDC, NIOSH, or EPA references and lab methods. The audit is about plan quality and defensibility, not a substitute for legal review.

Common issues include vague scope, missing exposure limits, sampling durations that do not reflect the actual task, and no rationale for why the selected employees represent the exposure group. It also catches missing pre- and post-calibration records, unlabeled pumps or media, and incomplete chain-of-custody forms. Another frequent problem is comparing results to the wrong criterion or failing to define what happens if results are elevated. These gaps can make otherwise useful samples hard to defend.

Yes. The same structure works for airborne dusts, welding fumes, solvents, metalworking fluids, noise, and other exposure assessments, but the hazard-specific method and criteria fields should be updated for each program. You can add sections for respirable versus total dust, personal versus area sampling, or task-based versus full-shift sampling. If your site uses multiple labs or instruments, add fields for method numbers, media lot IDs, and instrument serial numbers. The goal is to make the plan specific enough that another qualified reviewer could repeat it.

An ad hoc checklist often confirms that samples were taken, but it may not verify whether the plan was scientifically and operationally sound. This audit template forces the reviewer to check the exposure basis, sampling design, calibration trail, and result distribution path before the work starts. That reduces the chance of collecting data that cannot answer the exposure question. It is better suited to programs that need repeatable documentation and internal review.

Each deficiency should be assigned to an owner with a clear correction before sampling begins or before results are finalized. If the issue affects data validity, the plan should be revised and the affected samples flagged as invalid or limited in use. If the issue is administrative, such as a missing distribution list or incomplete field log, it should still be closed out before the report is released. The audit is most useful when it drives a documented corrective action, not just a note in the margin.