This cache is a Bonus Cache for the Historic Route 66 Santa Rosa & Points West Adventure Lab, which is part of the adventure lab series which goes from Chicage, IL Santa Monica, CA. To find the Adventure Lab, scan the QRC image here with your smart phone.
Cache will not be found at these coordinates, although it is not that far away. To find the cache location you must find two clues in the Adventure Lab Journal for the above adventure. There is one clue which is duplicated at the east and west ends of the adventure (Santa Rosa and Cline's Corners). The second clue is in the Journal for the adventure lab cache near here.
Enter the two clues as a phrase into Certitude to reveal the cache location.
You can validate your puzzle solution with certitude.