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i �. <br /> I SubsurJace EzPli'r°rion, Geologic Nmvrd, and <br /> Prefiminnry Geo[echnica!Eng�ering Report <br /> Sho-/sJe Ski1Ls Centa Addirion p���• ' Desi n Recomnundat+a+s <br /> iEverctt, Washin ton <br /> laborarory testing pe <br /> rformed on native lodgement ti(1 soils have Ueen included in the APPendix <br /> of this report. <br /> Corrosion Potential of On-Site Soil <br /> Soil samples from exploration boring EB-2 at a depth of 5 feet below existing site grade and <br /> exploration boring EB-4 at a depth of 5 feet below existing site gtade were submitted for <br /> laboratory testing. 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 /> repor*. The resulu of the testing aze shown below in Table 1. <br /> Table 1 <br /> g�mplc Exploration and Testing Results <br /> O�tidatiou/Reduction S�-ides <br /> Potential <br /> Exploration SamPle Depth Resistivity H (mv) (mg/� dr ) <br /> Borin No. ([eet) (ohm/rm) 44.0 <br /> 43,500 158.9 <br /> p,g_Z 5 feet �� 314.8 Non-De[ect <br /> gg.q 5 fcet 62,500 <br /> ohm/cm = ohm per untimaer <br /> mv= millivolt � <br /> mg/kB = milligrams per kitogram <br /> The Ductile Iron Pipe Reseazch Association (DIPRA) developed a system in which resistiviry, <br /> pH, oxidation/ceduction potential, sulfide, and moisture content determination are used as a <br /> basis fot determining corrosion potential. A point total of 10 or more, based on the DIPRA <br /> criteria, which assigns point values to cortosive conditions, requires that p�Pes be protected by <br /> including corrosion mitigation. The following tabie presents a 10-point system used to <br /> quantify che risk associated with ductile iron pipe corrosion. <br /> ASSOC/ATED F.1RTX SCIENCE$ INC. <br /> j�e 11 Zppg Page 13 <br /> EGAd-EE(49011)AS-Prolea�IpOWZi?IEEIWP <br />