I was just guessing about the foam being from the stabilization, but it makes sense. I was there when they were pumping foam and stabilizing the seawall, but heck if I can remember when it was. It sucks getting old. I remember one of the workers telling me that it held the rocks in place.
Here is a short reference to it in the Guad Reporter. I know I read about it somewhere else too in detail. Maybe your mad googling skills can find a better source.
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