We saw Boulter state Rule #27 on one of our bay area caches (Ring Around the Rosie). Here is another:
Rule #28 of Geocaching in the Bay Area: never log an archive request on a cache on Marky's watch list. He's sure to go out and check on it and leave some other caches nearby causing you to make another trip or two.
The cache is a black decon container. It is jammed full of trade items from secret trailhead #14, which got replaced. Bring small trade items.
GPS signal is hard to come by along this trail. The hint may help you if you know your trees.