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7,9 SOLI.IBLE ST]LFATES AND SOIL CORROSIVITY <br />Minimum resistivity test on one near surface bulk sample from the site indicated that on-site <br />soils are slightly corrosive when in contact with ferrous materials. The preliminary chemical <br />test results are included in Appendix B. Typical recommendations for mitigation of the <br />corrosive potential ofthe soil in contact with building materials are the follo\\'ing: <br />Below grade ferrous metals should be given a high quality protective coating. such as <br />an l8 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 />It is also rscommended that additional sampling and analysis be conducted during the final <br />stages of site grading to provide a complete assessment ofsoil corrosivity. CeoBoden 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. <br />8.0 CONSTRUCTION CONSIDERATIONS <br />Based on our field exploration program. earthwork can be performed with conventional <br />construction equipment. <br />ll Dennis- I -0'l