In addition, I have been playing this map and even though i sometimes experiance a few problems with textures and sounds but not for quite awhile, but when playing through this map for the 4th ish time with a few more players just to see if was not just me, that was expeiriancing these textures missing.
I did check to make sure it was mounted, i mean if it was not i would not have been able to play right haha
But there were about 4 or 6 of us and you can see:
The textures for the water droplets for the waterfall were missing and..

I asked if other players saw the error instead of the model, and those were the answers, just so you know
I don't know what was missing from here some model.
This may to do with the server missing these texures or the model if so it was the [YaS] server but even so it does not affect play.
Oh and i have tried verifying my game cache for counter strike source, and starting it up just incase, heh.