Reroute pay question. I read the reroute section of the PWA but it's still unclear to me.

I was on 1-day GS and just got rerouted into a 2nd day. The contract made it seem like I get the GS pay plus reroute pay. Is this correct? My time card shows both the GS pay and 10:30 of reroute pay but I've seen reroute pay disappear after the fact when they do the audit.

Thanks