The cache is not at the posted coordinates but is very nearby! This is a fast and easy field puzzle. The posted coords will take you to a sign describing the legend of Temecula. The physical cache is located at
N 33 29.A, W 117 09.B
Where A = the year the first Butterfield Stage arrived in Temecula minus 1,069.
And B = the year that Kaiser Industries (no relation) purchased Vail Ranch minus 1,830.