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I'm a structural engineeer in AL. Never run a pipe under a footing. When you say spring, how big are you talking? Approx width and depth is what I'm talking. If small and the soil is good you can possibly reroute it while you build the wall then return the natural flow through a pipe. You'll need to rerout temporarily while under construction. You can step the footing under the flow and then pipe through the wall. How tall are you calling a small wall?
A photo would help too.
How are things in good old LA? I was down there myself a couple of weeks ago coming back from Mexico Beach.
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