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If you can get to rock (any large rock even a large floater but bed rock much better) why not do so.
The one I did at the old place saw getting to bed rock about a meter down..I then cut into it to a depth of about 2 inches.
I placed my pvc pier pipe on that base with some holes in it and placed I think 3star pickets inside..I may have had some wire netting but I am not sure...filled the pipe with concrete with some over the rock floor...I cant recall but wire tieing the star pickets would be a good idea and certainly some stainless steel mess as well...I did not but filling the hole with rock and concrete would be good...if you are going to do it go for overkill☺
Good luck with your project.
Alex
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