Geocaching in Vallejo would be a lot more fun with more geocaches to find. So... here is my contribution.
There is no need to cross the fence, the cache can be reached from the sidewalk. Please use stealth so this one remains for a while.
It is a small geocache with room for a log, swag and trackables. If you take something, please leave something of equal value. It is not hard to spot - but again, if you don't place it carefully it could easily be gone.
It can hold a pen, but I didn't add one, so BYOP.