Appendix K is often viewed as something that only regulatory specialists or engineers need to worry about. Between the training requirements, defined procedures, and documentation expectations, it can feel disconnected from day-to-day optical gas imaging (OGI) work in the field.

If you're already performing OGI surveys per the EPA's* alternative work practice (AWP) for leak detection and repair (LDAR), much of Appendix K aligns with what you’re doing today. The difference is structure and documentation, not a completely new way of working. With the right OGI camera and supporting workflow, Appendix K becomes a practical extension of standard OGI surveys rather than an added burden.

For technicians, Appendix K isn’t about changing how leaks are found. It’s about consistently capturing the data that demonstrate how the work was performed—while improving time-to-survey and repeatability in the process.

What Appendix K is designed to do

Appendix K was developed to standardize how OGI surveys are performed and documented within leak detection programs. Its intent is to create consistency across surveys and operators, linking qualitative OGI observations to defensible, auditable data.

While it can appear prescriptive on paper, in practice Appendix K focuses on a small set of fundamentals: repeatability, transparency, and confidence in survey results. The methodology defines how conditions, distances, and imaging practices are captured, so that results can be reproduced and verified.

Appendix K is not required for all OGI work. However, the ability to demonstrate that surveys follow a validated, standardized approach strengthens audit readiness and reduces ambiguity during regulatory review.

So if you’re already using OGI per AWP, Appendix K is a natural next step rather than a complete overhaul.

Tips for implementing Appendix K in the field

1. Start with a pilot program

   Appendix K doesn't need to be implemented across every site at once. One or two representative facilities, ideally locations where OGI surveys per AWP are already established, make a practical starting point.

   Perform Appendix K surveys alongside your existing OGI workflow, and focus on what changes in the field. Evaluate detection performance and the ease with which current procedures adapt to Appendix K requirements. In most cases, gaps become clear quickly, and the difference between the two approaches is smaller than expected.

   Starting with targeted trials enables teams to build familiarity with the methodology, identify process adjustments, and gain confidence before scaling up.

2. Select an OGI camera built for Appendix K field surveys

   Appendix K surveys depend on consistent execution in the field and the ability to capture required information at the time of the survey. Not all OGI equipment and workflows are designed with these requirements in mind. The optimal camera should satisfy the following criteria.

   Enable faster operations in the field
   OGI systems used for Appendix K should support structured survey execution, including consistent inspection routes, defined coverage, and repeatable imaging practices. Tools that help guide technicians through surveys reduce variability between operators and sites.

   Capabilities such as multitargeting can support accurate source identification and capture from appropriate viewing angles, while tracking required dwell time—an important Appendix K parameter—for all components in the field of view. Capturing this information during the survey reduces reliance on estimates or postprocessing assumptions and helps ensure that results can be reproduced and verified.

   Improve detection performance
   Detection performance is directly influenced by image quality. High-resolution infrared and visible imaging improves clarity at distance and in congested or complex operating environments, supporting detection at Appendix K minimum thresholds and reducing uncertainty during surveys.

3. Centralize survey data for easy access and review

   Appendix K is ultimately about reporting results that can be reviewed, verified, and defended. Documentation should not be treated as an administrative step after the survey, but a core part of the survey itself.

   Appendix K–aligned workflows should ensure that required data—such as environmental conditions, distances, viewing angles, and survey timing—are captured consistently and linked directly to the videos and images captured by the OGI camera. Relying on manual notes or postsurvey reconstruction increases variability and risk.

   Integrating documentation into the survey process helps ensure consistency across technicians, sites, and surveys. This step will not add complexity if the camera automatically captures the metadata for all video footage and images.

Appendix K made easy—with the right OGI technology

Appendix K wasn’t implemented to change how technicians perform OGI surveys. It was implemented to provide a structured way to execute and document work so that results are consistent, defensible, and ready for review.

This is where solutions such as the Aura OGI™ handheld OGI camera make a big difference. By combining high-resolution imaging with automated metadata capture, integrated verification checks, and software designed around real field workflows, the camera aligns directly with the practical requirements of Appendix K. Required information is captured during the survey itself, coverage is consistent, and leaks are documented.

The result is an audit-ready record without added steps in the field. For teams already performing OGI per AWP, the Aura OGI camera enables Appendix K to function as a natural extension of existing surveys, ensuring defensible results, improved time-to-survey, and repeatability across sites and operators.

* US Environmental Protection Agency