Welcome to Historic San Juan Capistrano, or HSJC for short. This is part of a mini series of caches that are placed at historic areas in San Juan Capistrano.
At the above coordinates you'll find a plaque that talks about the history of the district. Here, is where you can find the coordinates to get the cache.
The cache can be found at: N 33° 30.ABC W 117° 39.DEF
A = The number of letter Fs on the plaque's name
B = The last digit in the earliest year that the most common structures on Los Rios Street are board and batten homes were built.
C = The second digit in the year that the Santa Fe depot was rehabilitated. (There are two answers, but they both are the same digit.) Then subtract 1.
D = The second digit in the year that the Santa Fe Depot was constructed in.
E = The second digit in the year that the Combs House was built.
F = The number of lines in the main last paragraph to the left of the Combs House photo. Then add 2.
Checksum for A through F = 39
You can validate your puzzle solution with certitude.