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Water from runoff and storm surge would undermine the old concrete slab, and it would fall away.
There was No Rebar in this slab to prevent it from collapsing when its dirt/sand base would wash out.
The correct method would be to dig out, and install large footings similar to what is holding up Scripps Pier.
You don't see those things moving do you.... That type of treated/reinforced concrete holds up well.
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They could also excavate the area and drop in large rock. Similar to what you see in jetty construction. Then pour concrete over the top.
-That would be my method.
The rock would interlock and allow for drainage. It would not wash away. If necessary the top coat of concrete could be periodically renewed as necessary.
But Hey - What the hell do I know.
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