Special Containment Procedures: Both entrances to SCP-2093 are to be locked, with at least one security guard patrolling each entryway during normal school hours. Any persons witnessed exiting SCP-2093 without outside assistance are to be detained and interrogated.
This is an extremely short Special Containment Procedures. Perhaps adding something about how the highschool has been closed and any entities attempting to enter or exit without SCPF approval should be detained? Personally, I don't see the foundation leaving a school with an SCP active.
third floor drama room of ███████ High School and located in █████████, Maryland.
This reads like there are two entrances to the spatial anomaly. Shouldn't there be a note about foundation operatives near the second entrance in the Special Containment Procedures? If there is only one entrance, you need to reformat this.
Upon entering SCP-2093 and closing both entrances, personnel inside enter the spatial anomaly, losing electronic communications with those outside.
This is just a tiny bit rough. The problem seems to stem from what the SCP is. Is the SCP a room? Or is it the spacial anomaly the room leads to? Using the second definition of SCP-2093 you could say something like: "Upon entering the drama room and closing both doors; personnel are transported into SCP-2093." You might also want to drop the part about electronic communication. It just doesn't seem to fit with the rest of the sentence.
Personnel are able to exit the room while remaining within SCP-2093,
This is what I was talking about. You need to make it clearer what SCP-2093 is. From the first sentence, I was under the impression that SCP-2093 was the drama room.
the limits of the anomaly extend apparently in all directions,
Maybe lose the apparently? This might be more of a personal preference thing.
Continued exploration has revealed the limits of the anomaly extend apparently in all directions, and attempts at leaving school property have yielded an indefinite expanse of empty grassland
I want to point out that the trouble with this sentence, and most of the rest of the SCP, is very minor. When I read the above I understand exactly what you mean but it's just a tiny bit off. In the above the problem is the word "yielding" in this sentence. Yielding implies that you are getting something like a gem or a book. But you use it to describe the results of attempting to leave. Perhaps restructuring it to say something like "The school is surrounded in an apparently endless grassland." could be better
attempt to glean as much information
Glean seems to be the wrong word here. Perhaps "obtain" or something similarly non-conversational.
Upon entering, Agent West remarks the presence of a powerful smell similar to burning plastic.
This is a problem that appears a few times in your logs. Rather than saying that they say something why don't you just have them say it? Something like:
Agent West: Do you smell that?
Agent Pierce: Yeah, kinda smells like burning plastic
(Both agents descend to the second floor)
You also do this during first contact with the ursine-entities.
Expedition 17 is where you really have to focus your editing. If I found a book that didn't open I wouldn't say "push it like a button" The dialog here desperately needs some fixing. As a first step you could completely remove the part about being unable to open the books since it adds nothing but bad dialog to the SCP.
the only problem with the changelog is that it still has the default "hide block" when you click on the collapsible. Otherwise, it's great.
To address some of the concerns others have raised about exploration logs being too much of the SCP: I think it's fine as it is. However, If you wanted to change it it would be quite easy. Instead of including the logs that show the "bug fixes" (like Expedition-018) you could have a series of addendums with time stamps that describe the "updates" and have the main description describe the school as it was when the foundation first found it.