Pictic Tryptic Three: Building Principals Mystery Cache

This Mystery Cache is not at the published location. It is the third of three puzzles in this "Pictic Tryptic" series that requires you to convert the puzzle information into a graphic solution. This cache requires multiple steps to solve the puzzle, and converting this information into something resembling the first cache and the second cache in this series should help everything fall into place.  You are solving for the last 3 digits of the North and West coordinates, for this: N 38 50.XXX W 077 09.XXX