This cache can be found at the posted coordinates, but is a challenge cache with specific logging requirements - please read below
We're dedicating this little challenge series to the number 3... Starting with a trio of challenges of moderate difficulty - even if you don't qualify, these should be readily attainable for anyone, especially if you don't mind little road-trips!
This cache requires you to find 75 specific caches, a little like the 3x3x3 icon challenge - but for this challenge you need to complete 3 separate 3x3 sub-grids, one for each of 3 different cache types. See the image below for more clarity.

Feel free to find this cache at any time, but before logging it as a find ensure you have qualified by using the Project-GC checker below.