About 15' from the trail, but you'll have to go up and around in the obvious spot. No bushwhacking necessary, but maybe some bush parting. Please be gentle.
Access to caches on this trail can be gained either by the Potrero trail head at N34 09.343 W118 56.515
or the Felton trail head at N34 09.919 W118 56.138. The trail is about 1.5 miles end to end.