Amercian Standard Info, 2nd part

Hello, It has been a few years since I have ridden he American Standard. I know where the trail begins at the top of the old highway across from the first parking lot, etc, yopu make the right at the urinal and ride the trail. What I am looking for is how to spot what I will call the Extension or part 2 of the trail. I have only ridden it one. Basiclly, you are near the end of the standard ride. You pop out on the Jeep road and you ride it up toward the tower. Somewhere along there is a left hand turn maybe around mile 12 or 13? onto some single track and it take you on a great loop with some killer baby rock sections and then pops back out on the fireroad. I rode it once about 5 years ago and have not ridden that last section since then. Can anyone point it out to me?

Tx Andy