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i � <br /> ( \Ne recommcnd Ihat thc scismic ground shaking a� the sitc bc e��alu;ucd in accordancc �vi h �hc <br /> procedures prcscnted in �hc 1997 cdition of UC3C. 71�c Pugc� Sound region is dcsicnatc� as �i <br /> ( Seismic Zonc 3 in thc U[3C. For 7_onc 3 locations,a Scismic 7_onc factnr(T) of 030 is applicahlr <br /> � bascd on UBC Table 1G-1. ln our opimon, Ihc s��il profilc at ihc sitc is hcst charaGcrizcd as 1\pc <br /> S�,brsed on UDC Table IG-J. <br /> � 4.8.3 Liquefaction Potential <br /> J Liyuefactirni is a phcnomcnon whcre soils cspericncc a rapid loss of imcrnal sucngth as a <br /> consequencc of strong ground shaking. Ground sctticmcnt, latcral sprcading and/or sand boils ma� <br /> result from soil liqucfaction. Slrucwres supportcd on liqucficd soils could su(fcr foundation <br /> Iscttlemcnt or latcral movcmcnt that could bc scvcrcly damaging lo thc structures. <br /> Conditions farorable to liquefaction occur in loosc to medium densc, cican to moderately sill�• <br /> I sand, [hal is bclow [he ground ��atcr Icvel. IIased on our evaluation of the subsurface condilions <br /> observed in the e�plorations crnnpleted at thc site, i� is our opinion that thcre is a Irnv riek of <br /> liquefaction occurring at the ;ite. <br /> ' 4.6.4 Ground Rupture <br /> Ground rupture Gom latc:rl spreadin� is associated ��ith liquefaction. Lateral sprcading <br /> ( involves lateral displacements of largc volumes of liqueficd soil, and can occur on ncar-Icvcl <br /> � ground as blocks of surface soils displace relative to adjaccnt blocks. In our opinion, the risk of <br /> � ground rupwre resulting from lateral spreading is very lo��� because of the low po�ential for soils to <br /> liquefy at the site. <br /> Tlie nearest fault to the site is the northwest trcnding southcm 1�I�hidbe��Island fault of probable <br /> IQuaternary age (Go���er, et al, 1985). Tlie projection of thc fault is located approaimately 5 miles <br /> south���est of the sitc. The subsurface soil conditions and thc ihickness of the Quaternan•sediments <br /> I below the site, which are commonly morc than 1,000 feet thick, indicate that the poten[ial for <br /> surface fault rupmre is remote. <br /> f 4.8.5 Landslides <br /> � Landslides can occur as a result of strong ground shaking, often in association with liquefaction <br /> and I�teral spreadine. It is our opmion that slopes along the south side of the propcm� are both <br /> ( statically and seismically stable where inclinations do not exceed 2H:IV. C•arthwork will <br /> necessitate cuts in the existing south slope, especially in the southeas[ corncr of the property. If all <br /> I slopes and prepared in accordanceµ�ith the recommendations made in the earthwork section of this <br /> report, and no slopes along the property exceed 2H:1 V, then there is a low potential for landsliding <br /> as a result of strong ground shaking at the site. Potential minor sloughing of the su�cial soils tna�� <br /> ( occur during strong ground shaking. J <br /> 4.9 ERUSION AND SEDIMENTATION CONTROL <br /> � Potcntial sources or causes of erosion and sedimentation depend upon conshvction methods, <br /> slope leneth and gradient, amount of soil exposed and/or disturbed, soil type, construction <br /> i <br /> I, <br /> G c o L n g i n c c r s ]9 FileNo. 75R4•002-00•1130�OSU101 23/ <br /> ��� <br />