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I <br /> KRAZAN&ASSOCIATES,INC. I <br /> KA Project No. 092-20006 <br /> DRAFT Geotechnical Engineering Investigation <br /> Everett Water Main"V" 111 <br /> May 7,2020 <br /> Page No. 12 <br /> I <br /> enough sample for laboratory soil resistivity testing. Krazan can provide laboratory or in-situ resistivity <br /> testing during construction upon request. <br /> Detailed chloride and sulfate test results from Fremont Analytical are presented in Appendix A. The <br /> test results from the lab are presented in mg/kg,which is equivalent to parts per million(ppm). <br /> Table A: Corrosion Potential Results for On-Site Soils—Chloride Content(per Caltrans*) <br /> Soils are considered corrosive if the following condition exists: I <br /> Sample Location Parameter Mitigation Level Lab Test Results (ppm) <br /> B-4 at 7.5 ft. Chloride 500 ppm or greater 9.72 1 <br /> B-11 at 5.0 ft. Chloride 500 ppm or greater 2.01 <br /> *Califomia Department of Transportation—Division of Engineering Services—Materials Engineering and Testing Services—Corrosion <br /> Technology Branch—"Corrosion Guidelines—Version 1.0,"dated September 2003. 111 <br /> Table B: Corrosion Potential Results for On-Site Soils—Sulfate Content (per Caltrans*) I <br /> Soils are considered corrosive if the following condition exists: <br /> Sample Location Parameter Mitigation Level Lab Test Results (ppm) I <br /> B-4 at 7.5 ft. Sulfate 2,000 ppm or greater 14.5 <br /> B-11 at 5.0 ft. Sulfate 2,000 ppm or greater 8.51 <br /> *Califomia Department of Transportation—Division of Engineering Services—Materials Engineering and Testing Services—Corrosion <br /> Technology Branch—"Corrosion Guidelines—Version 1.0,"dated September 2003. <br /> Table C: Corrosion Potential Results for On-Site Soils—pH(per Caltrans*) <br /> Soils are considered corrosive if the following condition exists: I <br /> Sample Location Parameter Mitigation Level Lab Test Results <br /> B-4 at 7.5 ft. pH 5.5 or less 6.40 I <br /> B-11 at 5.0 ft. pH 5.5 or less 7.35 <br /> *Califomia Department of Transportation—Division of Engineering Services—Materials Engineering and Testing Services—Corrosion 1 <br /> Technology Branch—"Corrosion Guidelines—Version 1.0,"dated September 2003. <br /> Summary: Based on the above test results for chloride and sulfate content, as well as pH of selected <br /> soil samples, it appears that the soils have a low corrosive potential for buried metal objects. <br /> Krazan&Associates,Inc. I <br /> Offices Serving The Western United States <br /> I <br />