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1812.2.1 Corrosion Testing Requirements
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Tests shall be performed in each soil layer for soil resistivity, soil pH, organic content and sulphate concentration. The device or system shall not be used in conditions that are indicative of a potential pile corrosion situation, as defined by soil resistivity less than 1,000 ohm-cm, pH less than 5.5, soils with high organic content, sulfate concentrations greater than 1,000 ppm, landfills, or mine waste.
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Article 9 Construction [PDF] (page 60)
which have been machine finished. 6. Surfaces of structural steels meeting the specifications for atmospheric corrosion resistant steel shown by test ...