1. At one or more appropriate times during the verification process, the verifier shall conduct a site visit in order to assess the operation of measuring devices and monitoring systems, to conduct interviews, to carry out the activities required by this Chapter as well as to gather sufficient information and evidence enabling it to conclude whether the operator's or aircraft operator's report is free from material misstatements.

2. The operator or aircraft operator shall provide the verifier access to its sites.

3. For the purposes of verifying the operator's emission report, the verifier shall also use a site visit to assess the boundaries of the installation as well as the completeness of source streams and emission sources.

4.For the purposes of verifying the operator's baseline data report, new entrant data report and annual activity level report, the verifier shall also use a site visit to assess the boundaries of the installation and its sub-installations as well as the completeness of source streams, emission sources and technical connections.