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July 3, 2017 <br /> Single-Family Residence <br /> IAA Job No. 17-079 <br /> Page 7 <br /> unit appears to be mapped at a couple city blocks east of the project site. Therefore, the <br /> hazard of seepage and erosion induced landslides to occur on the site should be minimal. <br /> Seismic Hazard <br /> The Puget Sound region is in an active seismic zone. The steep slope flanking the east <br /> side of the project site is composed of dense advance outwash deposits. The advance <br /> outwash deposits are of high shear strength and are highly resistant to slope failures. <br /> Therefore, the potential for seismic hazards, such as landslides, liquefaction, lateral soil <br /> spreading, to occur on the site should be minimal if recommendations in this report are <br /> fully implemented. The proposed residence should be designed for seismic forces <br /> induced by strong earthquakes. Based on the soil conditions encountered by the test pits, <br /> it is our opinion that Seismic Use Group I and Site Class D should be used ha the seismic <br /> design of these proposed structures in accordance with the 2015 International Building <br /> Code(IBC). <br /> DISCUSSION AND RECOMMENDATIONS <br /> GENERAL <br /> Based on the soil condition encountered by test pits excavated on the project site, it is our <br /> opinion that the site is suitable for the proposed development from the geotechnical <br /> engineering viewpoint, provided that the recommendations in this report are fully <br /> implemented and observed during and following construction. Conventional footing <br /> foundations constructed at least one foot into the underlying dense advance outwash <br /> deposit may be used to support the proposed residence. <br /> Lm.& ASSOCIATES, INC. <br />