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California State Certified Laboratory No. 2153 4 May, 2015 Job No. 1504197 Cust. No, 12257 Mr. Bill Cook Condor Earth Technologies, Inc. 388 Frank West Circle, Suite I Stockton, CA 95206 Subject: Project No.: 6999B Project Name: Lincoln Elementary Corrosivity Analysis — ASTM Test Methods Dear Mr. Cook: C E-ZE R 0 ) 1100 Willow Pass Court, Su' Concord,C 945213-1vvri 9925 462 2771 s=ax. 925 462 2775 www.cercoanaiyticai.com Pursuant to your request, CERCO Analytical has analyzed the soil sample submitted on April 27, 2415. Based on the anaiytical results, this brief corrosivity evaluation is enclosed for your consideration noo, Based upon the resistivity measurements, both samples are classified as "mildly corrosive". All buried iron, steel, cast iron, ductile iron, galvanized steel and dielectric coated steel or iron should be properly protected against corrosion depending upon the critical nature of the structure. All buried metallic pressure piping such as ductile iron firewater pipelines should be protected against corrosion. The chloride ion concentration is none detected to 15 mg/kg. The sulfate ion concentration is from none detected to 15 mg/kg. The pH of the soil is 8.06 which does not present corrosion problems for buried iron, steel, mortar - coated steel and reinforced concrete structures. The redox potential is 2813 -mV which is indicative of potentially "slightly corrosive" soils resulting from anaerobic soil conditions. This corrosivity evaluation is based on general corrosion engineering standards and is non-specific in nature. For specific long-term corrosion control design recommendations or consultation, please call JDH Corrosion Consultants, Inc. at (925) 927-6630. We appreciate the opportunity of working with you on this project. If you have any questions, or if you require further information, please do not hesitate to contact us. Very truly yours, CEWO ANALYTICAL, INC. J. arby clow d, Jr., P.E. President 3DWjdl Enclosure