It's hard to answer your questions (at least for me, anyway) without some clarification.
1. Does the student have an IEP? Just confirming because sometimes a BIP can be in place without an IEP.
2. How does the BIP define "emergency removal?" Is it an action, a place, or both?
3. How/when is the location of sitting outside of gen ed classroom triggered?
4. When the listed behavior occurs, what is the process that is stated in the BIP in terms of where the student goes, what processing is done with the student, how it is determined when student will return to class? Is sitting outside the gen ed classroom a step in the process to return to class?
4. When the student is sent to the "Alternate Learning Placement," is this where students are sent for in-school suspensions? (That might be what they are talking about when they mention the 10 days because a removal for behavior in violation of school policy would not trigger a PWN or be considered a denial of FAPE until it reaches 10 days. But multiple occurrences (even if less than 10 days) should be a reason to revisit the BIP and see what can be revised to address the behavior.