In the 10K route follow the path shown around the pump house. and continue on until you see the path next to terminal avenue (after the water station).

After you enter the park trail again, turnaround at the 3rd lamp post on the west side of the trail. There is cone marking this turnaround point. On the way back stick to the right side of the island.

When you get close to the salt evaporation pond, follow the dirt trail parallel to the paved trail you used to get to the turnaround point. (Use the arrows in the map above.)