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� <br /> ; <br /> Gcutcchnical Gngincering L'v�.�uation <br /> 8310 Rim Drivc- Ryan <br /> Noveiubcr 8, 2004 <br /> RMI I�ilc N��. ?I GO•1 <br /> n���. � <br /> Scismic Hars�rd <br /> The project is locatc 1 within "l.one 3 of the Scismic %onc Map sho�vn ns Pigurc 16-2 ol'the 1997 Uniform <br /> l3uilding Code (U13Cj. �Phis corresponds to a Scismic 7_one I�actor, 7., of 030. Since medium dense to <br /> cery dense glacial soils ��ere encocwercd at the site, the site conditions best fit the UE3C deseription for <br /> Suil Profilc T}'pc Sc. <br /> lia�ards associoted ��ilh scismic acti�ity include liquefaction p�tential, slopc instability, and <br /> amplification of ground motion due to sofi soil. The dense to verv dcnsc glacial soils that arc interpreted <br /> lo underlie this site do not ha��c a signif icant potential for liqucfaction or amplificntion of ground motion. <br /> COIVCLIISIONS AND RF,COA1MENUATIONS <br /> Gencral <br /> It is our opinion thnt the site is comp;jtible, from n geotechnical enginecring standpoint, ���ith the <br /> pruposed de��clopment. The underlying dcposits on tlie lot on �chich the addition will be buili typically <br /> have high strenglh and nrc considered stnble �vith rcgard to deep-seuted curth movement. <br /> fhe surficial slope soils can be suhject to slo�v backo�asting due to ���enthering, crecp. shnllow sloughing, <br /> locnl erosion, and signific�nt storm ev�nts. "ihis would result in slow recession of the slope fnees. If <br /> vicectation is maintnincd on thc slope hclo�v thc housc, ihesc effects nrc cspected to bc minimal. <br /> lle��elopment Considerations <br /> Normnlly a building setback tiom the tup or toc uf steep slopes is specilicd to allo�v for backwnsting and <br /> sl�.pc ;'<.iilures. A setback is not���arranted,as thc slupes nre at icss than the angle uf mpose for these soils. <br /> i hr soil comprising the slopes is a dense out�rash snnd with eravcl and cobbles and there is little chance <br /> uf tailurc if the conditions spccitied below nre follo��cd. <br /> Thc Site Plan on Pigurc 3 and the Schemntic Cross Section A-A' represented on Pigure 4 show the <br /> proposed locntion of thc nddition un the sitc. F3ased upon the conditions described abo��e, it is our <br /> oE�inion that the slopcs are stnble and thnt the proposed locntion for the nddition is reasonable provided <br /> ccnain prccauiions nrc taken during constructiun. <br /> RMI Associates, Ltd. <br />