Don't quote me on any of this but here is how I see it:
You can scan through RULES ON APPEAL for Washington State... After a quick glance, I would assume that rule 5.2 is specific to your question...
The way I'm reading it (and assuming that this is the correct rule for your case), it looks to me like you should have filed your Notice of Appeal within 30 days after the entry of the decision.Quoting RAP 5.2
Hopefully one of our Washington experts could chime in.
Good luck!

