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July 21, 2014 <br />Two Single-Family residences <br />L&A Job No. 14-065 <br />Page 8 <br />deposit on the toe of the hillside portion of the site may experience lateral spreading of <br />soil in strong earthquakes. This hazard may be mitigated by the construction of a <br />retaining wall as discussed above. The proposed new residences should be designed for <br />seismic for�es induced by strong earthquakes. Based on the soil conditions encountered <br />by the test pits, it is our opinion that Seismic C7se Group I and Site Class D should be used <br />in the seismic design of the proposed residences in accordance with the 2012 <br />International Building Code (IBC). <br />DISCUSSII�T'�T AND RECOMMENDATIONS <br />'��Ysi�l�'i �rit`�f"1�1� <br />Based on the soil condition encountered by the test pits excavated on the site, ii is ou�° <br />opinion that the site is suitable for the proposed development from the geotecl�nical <br />engineering viewpoint, provided that the recommendations in this report are fully <br />implemented and observed during construction. Conventional footing foundations <br />constructed on or into the underlying hard Whidbey formation silt deposit or the inedium- <br />dense advance outwash sand deposii may be used to support the proposed residences. <br />Driveway may be constructed on proof-rolled weathered soil after surficial topsoil and <br />weak sQil in root zone are tripped. Collected storm runoff may be disposed onsite with <br />infiltration trenches into advance outwash sand deposit per recommendations in this <br />report. The toe of steep hillside is quite sensitive. Cut and regardi�g of the toe of hillside, <br />if required, must be carried flut and completed in dry season. Temporary shoring and <br />de��vatering may be required to stabilize toe cut. <br />LIU & ASSOCIATES, INC. <br />