The cache is not located at the posted coordinates.
This is the second cache in the second series of my experimental caching experience. There will be four caches and one bonus cache. All four caches will have a D5/T5 rating and the containers will be the same type of log-only nano. Each cache will feature a notable woman and each cache will use the in-page solution checker as well as a certitude checker. The success message will contain additional information that you will need to use to solve the coordinates of the bonus cache and will always show the posted coordinates of each mystery cache, not the correct physical location of the cache. There will be different challenges for you to get a success message from the certitude checker. The bonus cache will be named "Sue's cache" in honor of Edwards654 because I will be using an ammo can she donated for a childrens' Halloween geocaching day in 2020. All of the hides will be in Jefferson County Open Space.
This cache is located in the Apex Park open space. You will cover a lot of ground round trip to the cache and back. Make sure to allow enough time. There are park regulations that restrict use of some of the trails to hikers-only on odd days and bikers-only on even days. You do not have to use the restricted trail to get to the cache. However, if you'd like to plan a route that allows you to grab other caches on the trails at the park, then you'll want to plan your visit for an odd day. To get to this cache you can take the Argos trail, into the Pick-N-Sledge trail, to the Grubstake trail. You may choose to do Grubstake counter-clockwise, or you can continue further up Pick-N-Sledge and then pick up Grubstake and take it clockwise.
This cache features Agnes Meyer. Agnes Meyer was born in 1889. She earned a bachelor's degree in mathematics and physics in 1911. She was proficient in English, French, German, Latin, and Japanese. She played a significant role in breaking Japanese codes, among other accomplishments in her career with the Navy.
This puzzle is a good old-fashioned cryptogram and you will have to use good old-fashioned brain power to figure this one out.
Wpd mvvneurkwdz xvn wpd mkmpd knd rvnwp wpunwg rurd edynddz, xvnwg wpndd hvurw sdnv sdnv wtv curiwdz; tdzw vrd pirende xuod edynddz, wpunwddr hvurw zuf vrd sdnv curiwdz. Wpdzd mvvneurkwdz ev rvw hjkmd gvi nuypw vr wvh vx ynvire sdnv. Urzwdke wpdg hjkmd gvi vr wpd mvnndmw zued vx wpd wknydw wndd. Wpd urwdrede wndd zpvije qd mvchjdwdjg vqouviz wv gvi kz wpdnd knd rv vwpdn wnddz rdkn uw. Kz gvi zwkre kw wpdzd mvvneurkwdz, wpd wndd zpvije qd lizw tdzw vx tpdnd gvi knd zwkreury. Wv gvin zviwpdkzw wpdnd uz kr viwmnvhhury vx nvmaz. Wv xure wpd mkmpd jvva ih. Kz rvwde ur wpd kwwnuqiwdz xvn wpuz mkmpd, wpdnd uz k wndd mjucq ndbiunde. Pvtdodn, uw'z rvw wvv qke kw kjj. Gvi tujj rdde wv mjucq ih vrjg k mvihjd vx qnkrmpdz wpkw knd jvt wv wpd ynvire.
You will find the keyword for certitude at WP 1. If you bring a good pair of binoculars, you may be able to find your answer when standing downhill (east of) the waypoint. The waypoint is up a ravine. You do not need to leave the trail until you are directly below the waypoint. Stay on the Pick-N-Sledge trail. When you look up the ravine you will see a plaque attached to a tree. (The base of the ravine is at N 39 42.866, W 105 13.224.) The name on the plaque is the keyword.

You can validate your puzzle solution with certitude.
Congratulations to FTF: sleuthers!
Additional Waypoints
01996QY - WP1
N 39° 42.863 W 105° 13.263
This is at the tree that has the memorial plaque.