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Foam Over Underground Sewer

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I've got a project where I'm placing a new wall footing over a 36" storm
sewer.  I want to place 2" of foam over the sewer to ensure the pipe isn't
surcharged due to the new building wall/continuous footing.

Does anyone have recommendations as to a type or specification of foam.
Soil is sandy without a high water table.

Paul F. Blomberg
Phoenix, AZ