| http://www.w3.org/ns/prov#value | - Porous surfaces also include paints or coatings that have been applied to a non-porous surface such as metal . ??? non-porous surfaces including smooth unpainted solid surfaces that limit penetration of liquid containing PCBs beyond the immediate surface (e .g., smooth uncorroded metal, natural gas pipe with a thin porous coating originally applied to inhibit corrosion, smooth glass, smooth glazed
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