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M. J. SCHIFF & ASSOCIATES, |NC. <br />Consulting Corrosion Engineers - Since 1959 1291 North Indian Hill Boulevard <br />Claremont, California 91711-3897 <br />Phone 909-626-0967 <br />FAX 909-621-1419 <br />E-mail SCHIFFCORR@AOL.COM <br />August 12,1997 <br />GEOTECHNICAL PROFESSIONALS, INC. <br />5736 Corporate Avenue <br />Cypress, California 90630 <br />Attention:Mr. James E. Harris <br />Re:Soil Corrosivity Study <br />First American Title <br />Irvine, California <br />Your #1385.I, MJS&A #97246 <br />INTRODUCTION <br />Laboratory tests have been completed on three soil samples you provided from your borings for the <br />referenced project located on the northwest corner of MacArthur Boulevard and the 55 freeway. It <br />is our understanding that this project will consist of a six story office building with driven concrete <br />piles. The purpose of these tests was to detennine if the soils may have deleterious effects on <br />underground utilities, hydraulic elevator cylinders, and concrete foundations including piles. We <br />assume that the samples provided are representative of the most corrosive soils at the site. <br />The scope of this study is limited to a determination of soil corrosivity and general corrosion <br />control recommendations for materials likely to be used for construction. If the architects and/or <br />engineers desire more specific information, designs, specifications, or review of design, we will be <br />happy to work with them as a separate phase ofthis project. <br />TEST PROCEDURES <br />The electrical resistivity of each sample was measured in a soil box per ASTM G57 in its as- <br />received condition and again after saturation with distilled water. Resistivities are at about their <br />lowest value when the soil is saturated. The pH of the saturated samples was measured. A 5:1 <br />water:soil extract from each sample was chemically analyzed for the major anions and cations. <br />Sulfide and oxidation-reduction (redox) potential were determined on the sample most likely to <br />have sulfide and a negative redox potential. Test results are shown on Table 1. <br />CORROSION AND CATHODIC PROTECTION ENGINEERING SERVICES <br />PLANS AND SPECIFICATIONS o FAILURE ANALYSIS • EXPERT WITNESS o CORROSIVITY AND DAMAGE ASSESSMENTS