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I SubsurJace Expbration. Geobgic Hauvd, and <br /> ISno-l�k Ski1Ls Centtr Addidon PnliminorY Geotechnica!Engine�ring Report <br /> EYerett Wathin8ron Pre►iminary De;ign Recommend�iau <br /> Ilaboratory testing performed on native lodgement till soils have been included in the Appendix <br /> of this report. <br /> ICorrosion Potential of On-Sire Soil <br /> ISoil samples from exploration boring EB-2 at a depU► of 5 feet below existing site grade and <br /> exploration boring EB-4 at a depth of 5 fcet below existing site grade were submiued for <br /> I laboratory usting. Laboratory testing included pH, resistivity, sulfide, and oxidation/ <br /> reduction potential. The locations of the exploration borings aze shown on Figure 2 of this <br /> report. The results of the testing aze s6own below in Table 1. <br /> I <br /> Tabk 1 <br /> ISampk Ezpbration and Testiog Results <br /> Oatidation/Reduction <br /> ( Exploration Sample Depth Re�stivity P�� �� <br /> ' No. (ted) (ohm/cm) H (mv) ( ) <br /> EB-2 5 fat 43,500 5.94 158.9 44.0 <br /> I Bg4 5 fcet 62.500 7.07 314.8 Noa-Detect <br /> o�/ae =ohm per cemimeta <br /> mv = millivolt <br /> Imglkg =miilignms per kilogram <br /> I The Ductile Iron Pipe Research Assceiation (DIPRA) developed a system in which resistiviry, <br /> pH, oxidation/reduction potential, sulfide, and moisture content detemvnation are used as a <br /> basis for determining coaosion potential. A point total of 10 or more, based on the DIPRA <br /> � criteria, which assigns point values to conosive conditioas, requires that pipes be protected by <br /> including conosion mitigation. T6e following table presents a 10-point system used to <br /> quantify the risk associated with ductile iron pipe conosion. <br /> I <br /> I <br /> 1 <br /> I <br /> �,a,�ii, zaoa �ssocr,+r��+izn�sc�Ncss nvc. 6 <br /> IEcna-�m,.us-rro��a,izcoeoa,3��wr Page 13 � <br />