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<br /> <br /> 10 Parsons-1-01 <br /> <br /> <br />7.9 SOLUBLE SULFATES AND SOIL CORROSIVITY <br />Minimum resistivity test on one near surface bulk sample from the site indicated that on-site <br />soils are moderately corrosive when in contact with ferrous materials. The preliminary <br />chemical test results are included in Appendix B. Typical recommendations for mitigation of <br />the corrosive potential of the soil in contact with building materials are the following: <br /> Below grade ferrous metals should be given a high quality protective coating, such as <br />an 18 mil plastic tape, extruded polyethylene, coal tar enamel, or Portland cement <br />mortar. <br /> Below grade ferrous metals should be electrically insulated (isolated) from above grade <br />ferrous metals and other dissimilar metals, by means of dielectric fittings in utilities and <br />exposed metal structures breaking grade. <br /> Steel and wire reinforcement within concrete in contact with the site soils should have <br />at least two inches of concrete cover. <br /> If ferrous building materials are expected to be placed in contact with site soils, it may <br />be desirable to consult a corrosion specialist regarding chosen construction materials, <br />and/or protection design for the proposed facility. <br /> Corrosion test results also indicate that the surficial soils at the site have negligible <br />sulfate attack potential on concrete. No sulfate-resistant cement will be necessary for <br />concrete placed in contact with the on-site soils. <br />It is also recommended that additional sampling and analysis be conducted during the final <br />stages of site grading to provide a complete assessment of soil corrosivity. GeoBoden does not <br />practice corrosion engineering. Therefore, we recommend that on-site soils be tested and <br />analyzed near or at the completion of precise grading by a qualified corrosion engineer to <br />evaluate the general corrosion potential of the on-site soils and any impact on the proposed <br />construction. <br />Corrosion test results also indicate that the surficial soils at the site have negligible sulfate <br />attack potential on concrete. No special sulfate-resistant cement will be necessary for concrete <br />placed in contact with the on-site soils.