I take it you are looking at the listed data base here on RR. If it is not listed, then you have to suspect that these are the only talk groups.
If you are not using the RR data base, go to the freguency data page, click on WASH, then click on Seattle, then on the right select King County, then go to the bottom of the page and select Seattle-King Co public safety, this will bring all the information on the systems and talk groups.
Go down and select site 06, valleyCom and used those control frequency's.
Then you can go down the page and see all the talk groups.