Engineering Design Technologies, Inc. (EDT) worked with the City of Atlanta to perform a corrosion assessment of the soil environment for a proposed 48-inch ductile iron water main. A comprehensive corrosion assessment of the soil environment was performed in the vicinity of the proposed water main. The corrosion assessment included soil resistivities, stray current studies and soil chemistry analysis. Soil samples were collected from the pipe depth at regular intervals along the pipeline’s route. These samples were analyzed for pH, oxidation-reduction potential (Redox), conductivity, resistivity (as collected and saturated), sulfate, presence of sulfide and carbonate and chloride ion content. The results from the analyses were used in determining soil corrosivity at the locations from where they were taken. As a result of the findings of the corrosion assessment, a cathodic protection system was designed.
