QSTI Group 4 Exam guide include USA Epa methods

The provided sources and our conversation history **do not contain information regarding the technical topics for the Group 4 Exam**.

The sources currently available focus on Group 2 (**Manual Gaseous Pollutants Source Sampling Methods**). Our previous discussions have covered Group 1, Group 1A, Group 2, and Group 3.

If you would like, I can search for information specifically about the Group 4 Exam topics for you. Would you like me to do that?

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