My son has just about finished inserting his posts for a fence, 4 x 4
wooden posts with 6 foot spacing, the posts have been concreted in.
Where one of the posts should go he has discovered a large slab of
concrete about 6 inches under the surface and the concrete approx 6
inches thick. He reckons it wont come out easily or break up easily.
What are the options for putting a post there otherwise he will have to
span 12 feet between the post either side.
The fence will be vertical slats.