I recently went and looked at a job and the customer is wanting to do a paver driveway. which will be about 1300 sq. ft. They live on a corner lot and one concern is that the drive will be going from one side to the other. There will have to be 2 culverts put in to cross the ditches. Imagine a right angle, on the outside of the angle is street and inside the angle is lawn. I need to find a way to retain by base and pavers over top of the culvert. My first thought was to just pour a apporach over the culvert and pave the rest. But i do not want to get a concrete guy involved if i dont have to because he will flash his lower priced concrete. Do you guys have any recommendations on this?