Yeah, I saw that one in my research...that's not it. They are in totaly different places. The one I saw is like 10-15 miles from Phoenix, the APG is like 120 miles away. Plus if the scale on Google Maps is correct, this place is huge compared to the APG.

Here is a map with the track in question marked as "A" and the APG marked as "B".
Map


Nick Johnson 87' & 88' Thunderbird TC 96' Contour SE Midnight Red ATX