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Measured Permeability: Concrete Liquid Retaining Structures

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What test methods and test equipment are available to measure the 
permeability of concrete, either in-situ or of cored specimens ?  New 
regulations in Pennsylvania for "emergency containment structures" require 
that such structures have a permeability less than 10 minus 6 cm/sec and be 
certified by a PA PE.  In the appendix to the regs, ASTM test methods for 
permeability are referenced, but they apply only to soil. I don't find any 
ASTMs for concrete permeabiltiy testing.

Thanks for any input.
Jim Fulton