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i~ <br />JDH Corrosion Consultants <br />Incorporated <br />January 21, 2008 <br />Cornerstone Earth Group <br />1259 Oakmead Parkway <br />Sunnyvale, California 94085 <br />Attention: Mr. John R. Dye, P.E., G.E. <br />Principal Engineer <br />Subject: Site Corrosivity Evaluation <br />Busch Parcel <br />Project No. 132-2-1 <br />Dear John, <br />In accordance with your request, we have reviewed the laboratory soils data for the above <br />referenced project site. Our evaluation of these results and our corresponding <br />recommendations for corrosion control for the above referenced project foundations and <br />buried site utilities are presented herein for your consideration. <br />SOIL TESTING 8 ANALYSIS <br />Soil Chemical Analvsis <br />Four (4) soil samples from the project site were chemically analyzed for Corrosivity by Cooper <br />Testing Laboratories. Each sample was analyzed for chloride and sulfate concentration, pH, <br />resistivity at 100% saturation and moisture percentage. The test results are presented in <br />Cooper Testing Laboratories Corrosivity Test Summary dated 1/14/08. The results of the <br />chemical analysis were as follows: <br />Soil Laboratory Analysis <br /> <br />Chlorides .• . <br />10 - 115 m /k <br />Non-corrosive <br />Sulfates 8 - 194 m /k Non-corrosive ** <br />H 7.1 - 8.0 Non-corrosive** <br />Moisture % 7.8 -14.3 Not-a licable <br />Resistivity at 100% <br />Saturation 1,831 - 3,734 ohm-cm Corrosive to Moderately Corrosive <br />* With respect to bare steel or ductile iron. <br />** With respect to mortar coated steel <br />424 N. Wiget Lane, Walnut Creek, CA 94598 Tel. No. 925.927.6630 Fax No. 925.927.6634 <br />