Carrion Hill module map confusion

[LucyG92]

I'm reading through the Carrion Hill module - reading the Vats section at the moment. Rest is in spoiler tags...

Spoiler:

It says, of the zombies, "[...]and the other four lumber about in the pit below". I'm struggling to find out where the pit actually is on the map? Is it referring to the "2 feet of mud and water" next to the walkways?

[SodiumTelluride]

Spoiler:

Yes, the pit in that case means "not on the walkways." Basically they aren't much of a threat unless someone falls off.

[LucyG92]

Thanks. Another question, not related to maps: for knowledge (local) checks about the Keepers, do you just roll one check for the lot or each one individually?

[SodiumTelluride]

I had my party roll individually. Having heard about one of them doesn't necessarily imply having heard about the others.