When interference is found during interference testing, the AC current mitigation process should begin with ________.

The AC current mitigation process begins with AC modeling due to its importance in understanding how alternating current (AC) can affect pipeline systems. AC modeling involves evaluating the characteristics of the alternating current environment, which helps in assessing the interference that is influencing the pipeline. By conducting AC modeling first, the extent of the interference can be quantified, and effective strategies can be developed to mitigate any potential risks to the integrity of the pipeline.

This step is crucial because addressing the interference without first understanding its AC profile might lead to insufficient mitigation efforts. Once an accurate assessment through AC modeling is completed, further steps can be taken accordingly to manage the interference effectively.

Taking measurements such as structure-to-soil potential or interrupting rectifiers might be necessary parts of the mitigation process but they are typically performed after establishing a clear understanding of the AC interference through the modeling process.