Can you share a screenshot?
I believe that the 30 values are the value that is set on the ICA parameters and it's the number of the ICA component that you computed.
Yes,
you can refer to these tutos:
https://neuroimage.usc.edu/brainstorm/Tutorials/ArtifactsSsp
and
https://neuroimage.usc.edu/brainstorm/Tutorials/Epilepsy?highlight=(ICA)#Artifact_cleaning_with_ICA