The posted coords will put you right in front of the Bing Wing of Stanford's Cecil H. Green Library. If you stand at that spot, your shoes will be very wet. Fortunately, the cache you seek is hidden at a drier location. Determining that location, of course, is the puzzle.
Last month fizzymagic published an Acrostic puzzle (GCARXFF) that included the following clue:
D Fizzy's favorite word; reused parchment
If you don't know the answer, check the top of this page. The word refers to a manuscript page that has had the original text scraped or scrubbed off so that it can be used for a new document. In a figurative sense, it can describe something that has differing meanings on different levels.
The document you see below is a rather imperfect example of the concept. The scribe who created it doesn't seem to have understood the importance of clearing the previous text so that the newer is readable.
Even so, you may be able to perceive the secrets of this document; it is easily done if you have an appropriate application or can find one of the many available online solvers .
https://www.aatbio.com/tools/online-image-channel-splitter-rgb will do the job.
You can validate your puzzle solution with
certitude.