2211 GIBSON PL Geotech Report 2023-04-06

r r August 18, 2014 Gibson Bluff L&A Job No. 14-056 Page 8 most likely not exposed within the project site, and the erosion-induced, upward-working landslides are unlikely to occur within the site. Therefore, it is our opinion that the site is not prone to landslides if the recommendations in this report are fully implemented and observed during and following completion of construction. Seismic Hazard The Puget Sound region is in an active seismic zone. The site is underlain at shallow depth by medium-dense to dense, Esperance sand deposits. These deposits are of moderately-high to high shear strength and high permeability. Therefore, the project site is not prone to seismic hazards, such as liquefaction, landslides and lateral soil spreading. The proposed buildings, however, should be designed for seismic forces induced by strong earthquakes. Based on the soil conditions encountered by the test pits, it is our opinion that Seismic Use Group I and Site Class D should be used in the seismic design of the proposed residences in accordance with the 2012 International Building Code (IBC). DISCUSSIONS AND RECOMMENDATIONS General Based on the subsurface conditions encountered by the three test borings drilled on the project site, it is our opinion that the site is suitable for the proposed development, provided that the recommendations in this report are fully implemented and observed during and following completion of construction. The proposed residences may be supported on conventional footing foundations bearing on or into medium-dense to dense, LIU & ASSOCIATES, INC.