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Custom Soil Resource Report <br />or concrete in installations that are entirely within one kind of soil or within one soil <br />layer. <br />For uncoated steel, the risk of corrosion, expressed as low, moderate, or high, is based <br />on soil drainage class, total acidity, electrical resistivity near field capacity, and <br />electrical conductivity of the saturation extract. <br />For concrete, the risk of corrosion also is expressed as low, moderate, or high. It is <br />based on soil texture, acidity, and amount of sulfates in the saturation extract. <br />19