The cache is NOT at the posted coordinates.
This is a bonus cache for completing my Adventure Lab Cache "Sedro, The Tale of Two Towns". To obtain the final coordinates you need to complete the Lab Cache. Pay attention to the journal entries at the lab caches. There you will be given the coordinates for this cache.
Good luck. Keep calm, and cache on.
Congratulations to CorvetteKent and Cache Finder 6000 as CO-FTF.