When I think of Bishop Ranch, I think of the longest block of continuous sidewalk. There are 1.2 miles of sidewalk from Glen Annie to Los Carneros along Cathedral Oaks Road. There are a couple of fences, the longest is over 3/4 of a mile.
For this puzzle- Start your journey at waypoint "START1" at the Northeast corner (nearest the bridge) of the longest fence. You will count the vertical gray metal fence posts as you walk West along Cathedral Oaks. Do NOT count rust brown or green colored posts, diagonal supports, horizontal supports, or posts that have been crushed and are no longer acting as posts. When your count reaches 297 (+/- 2 to allow for fence maintenance), you are at a location where there is access under the sidewalk. If you are west of waypoint "TOOFAR", then you have traveled too far. Turn around and recover or go back to the start.
The cache is between waypoints "START1" and "TOOFAR". I added a photo of the fence with demo counts.
Walking will be the most successful method of transportation for a find. Of course, you may have experience along this route and have other ways to solve this puzzle. TOTT may be required to attain the log. No need to trespass. For people with some skill it is possible to grab and replace the cache without leaving the sidewalk.