Honorable mention: early Dec 2005. Got 5-6" in Tacoma, forecast was tr-1". A south sound special, as places south of Olympia and Seattle area got next to nothing.
Yeah, we topped out with 9-10" on the ground with the Dec 1996 event before the rain started. Most I saw on the ground during my time growing up in the PNW, albeit brief.
I think 1/6/04 topped out at 7".