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603284-001 <br />3.5 Corrosive Soils <br />Corrosive soils are characterized by their ability to degrade concrete and corrode <br />ferrous materials in contact with water or soil.In particular, concrete is <br />susceptible to corrosion when it is in contact with soil or water that contains high <br />concentrations of soluble sulfates which can result in chemical deterioration of <br />the concrete. For ferrous metals, electrical resistivity of the soil can affect <br />corrosion. Based on the results of the corrosion testing, the site soils are <br />deemed corrosive to moderately corrosive to ferrous metals based on a minimum <br />soil resistivity (saturated) of 3089 and 8000 ohm-cm. Sulfate attack potential for <br />concrete in contact with site soils is deemed negligible based on a sulfate content <br />of 44 and 89 parts per million (ppm). Chloride exposure is deemed low based on <br />a chloride content of 43 and 62 ppm. Test results are presented in Appendix C. <br />-16- <br />Leighton