When coming in through the truck entrance, at the very first parking spot on the right is where the route starts. You can park anywhere, but this is where you would walk in. Walk down wide grass area. If you go towards the cache from there, you'll find the way in. Cross the small ditch and you will find a stone wall. This is the area you want to be in.
Ng gur onfr bs gur ortvaavat bs gur fgbar jnyy.