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March 14. 2010 <br /> Addition to Stecves Kcsidcncc <br /> L�A .lob No. 10-OOR <br /> Pagc 8 <br /> i <br /> Seismic Hazard aod Desige Considerations ( <br /> 'l�he Pugel Sound region is in �in active seismic zunc. 71ie subjecl site is undcrlain at <br /> shullow depth by dense silty tine sand and hard tine sandy silt soils of high shear strength. <br /> 'fhcrc is a lack ol'continuuus. cxlcnsivc ground���atcr tablc at shallo�v dcpth undcr thc sitc. <br /> '1'hc combination ol'thc abovc shauld makc it rathcr unlikcly 1'or scismic hazards, such as <br /> liyucl'action or soil latcral spreading. to occur on the site during strong carthquakes. <br /> "Theretiire. the scismic hazard tiir the subject site should be miniival. "I'he proposcd ne�� <br /> addition should, howcvcr. hc dcsigncd to �vithstand scismic r'orccs induccd by strong <br /> carthquakcs. 13ascd on tlic soil conditions cncountcrcd ty the tcst pits, it is our opinion <br /> that Scismic Usc Group I and Sitc Class ll should bc uscd in thc scismic dcsign of thc <br /> propuscd residcnccs in ,iccurdancc ���ith Ihc 200G Intcrnational 13uilding Codc (IBC). <br /> TEMPORARY DRAINAGE AND EROSION CONTROL <br /> "I'hc onsitc surficial soils contain a rclativcl)' high perccntagc uf tincs which arc srnsiti��c <br /> to moisturc and can bc casily disturbcd by construction traffic. A laycr of dcan. 2-to-d- <br /> inch yuart�� spalls should bc placcd ovcr areas of trcyucnt traffic, such as the cntrancc to <br /> and frcqucntly U•avcl areas of thc sitc ❑s rryuircd, tu rrotcct thc subgrcidc soils I�rom <br /> disturbancc h� c�msUvctiun u�aliic. <br /> �1 silt Icncc shuuld bc installcd alone thc ilu��nhill baundarics of thc sitc to minimizc <br /> transport of scdin�cm onto thc slccp slopc �vithin thc site and thc ncighboring propertics. <br /> "I�hc holtotu of thc liltcr cluth af thc silt fcnccs should bc anchorcd in a trcnch hackfillcd <br /> ��;Ut onsilc soils. <br /> � <br /> LIU & ASSOCIATES, INC. ���� � �,��, � <br />