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� <br /> ( Subsurjace Exploration, Geologic Nazard, and <br /> Sno-/sle SkiAs Ce+utr Additlon Preliminary Geotechnica!Engin�ering Report <br /> Evtnn Washington Prelirrunary Design Recommendations <br /> ITable 2 <br /> Soil Test Evaluation for Ductile Iron Pipe <br /> ICriteria Rsn Point Vslue' <br /> Resisuviry(ohm/cm) < 1,500 10 <br /> 1,500-1,800 8 <br /> 1.800-2,100 5 <br /> 2,10a2,500 2 <br /> � 2,500-3,000 1 <br /> � >3,� � <br /> P}I 42 5 <br /> I 2� 3 <br /> 46.5 0 <br /> � 6.SJ.5 p�"` <br /> 7.5-8.5 0 <br /> � >8.5 3 <br /> OxidationlReduction(mv) >100 0 <br /> 50-100 3.5 <br /> � a� a <br /> Ne ative(-) S <br /> Sulfides Positive 3.5 <br /> i Trace 2 <br /> Ne ative � <br /> Moisture Poor Draina e,continuousl wet 2 <br /> i Fair Draina , enerall moist � <br /> Good Draina e, enerall � <br /> ohm/cm = ohm per centimeter <br /> ( mv = millivolt � <br /> + A value of 10 poims or higher indicates that pipe protxtion is required. <br /> •• If sulfides are presem and 1ow,or negative redoz results are obtaircA,three(3)points shall be Biven for this ru�ge. <br /> � Based upon the results of the testing and compazing these values to published results provided <br /> , by DIPRA, the soils encountered in exploration borings EB-2 and EB-4 were found to 6ave a <br /> ; point value of 5.5 and 4, respectively. Our laboratory testing indicates that the soils <br /> encountered in EB-2 and EB-4 have a relatively low potential for corrosion. <br /> I103 Conswction Monitoring <br /> i A representative from our firm should inspect the stripped subgrades and be present during <br /> placement of structural fill to obssrve the work and perform a representative number of in- <br /> place density tests. In this way, the adequacy of the earthwork may be evaluated as filling <br /> progresses and any problem azeas may be corrected at that time. It is important to understand <br /> that taking random compaction tests on a part-time basis will not ensure uniformity or <br /> i <br /> lune 11. 2008 ASSOCfA7F1)EAR7N SCIENCES. INC. <br /> � £G/W-EE0802I3A5-Oro1MS11POS01131EE1WP Page 14 (� <br />