[Hugh R]

Just a wild stab. When I was a consultant, I did some industrial hygiene exposure monitoring on this company that injected Toluene Diisocyanate foam into the freeways of Los Angeles to raise the freeway where it had settled after the Northidge Earthquake. They'd drill holes in the concrete and inject foam to slowly raise it so that the joint between the freeway and an bridge didn't have a big hump in it. Won't help the rotting problem, but might help with a settling into the ground issue. What about this with a combination of cinder block pillars? Hope this helps.