The cache is NOT at the posted coordinates!
This cache is a bonus for completing "Sacramento's Pocket History" adventure lab cache. At the 5 locations, you will see a bonus hint (for example, n = 1) after correctly answering the question and viewing the journal entry. The final coordinates for this cache are in the form of:
N 38 29.ABC W 121 33.DEE
Pnpur npprff: fgerrg cnexvat vf ninvynoyr yrff guna 200 srrg sebz TM. Pnpur uvag: terrare guna gur erfg.