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GEOTECHNICAL ENGINEERING STUDY <br /> Mr. Arthur Skotdal <br />, — c/o Dykeman Architects E-6225 <br /> July 27, 1993 Page 9 <br /> — Spt.mir Desian Considerations <br /> The Puget Lowland is classified as a Seismic Zone 3 by the Uniform Building Code (UBC). <br /> — The largest earthquakes in the Puget Lowland are w�despread and have been subcrustal <br /> events, ranging in depth from thirty (30) to fifty five (55) miles. Such deep events have <br /> exhibited no surface faulting. <br /> Ba�ed on the subsurface information obtained during our'field exploration, it is our opinion <br /> the liquefaction potential at the site is negligible due to the presence of dense over- <br /> consolidated soils and no near surfacQ groundwater table. <br /> The UBC Earthquake regulations contain a static force procedure and a dynamic force <br /> procedure for design base shear calculations. Based on the encountered soil conditions, <br /> it is our opinion that an S factor of Sz = 1.2 should be used for the static force proc�dure <br /> as outlined in Section 2334 of the 1991 UBC. For the dynamic force proce!dure outlined <br /> in Section 2335 af the 1991 UBC, the curve for rock and stiff soil (Sofl Type 1) shouid <br /> be used on Fig�re 23-3, Normalized Response Spectra Shapes. <br /> Excavations and Siooes <br /> � The following information is provided solely as a service to our client. Under no <br /> circumstances should this information be interpreted to mean that ECI is assuming <br /> responsibility for construction site safety or the Contractor's activities; such responsibility <br /> � is not befng implied and should not be inferred. <br /> As mentioned previously, we anticipate significant cuts will be required in orderto achieve <br /> ����' �� . l the proposed building subgrade elevations. These cuts will range from approximately <br /> ' :: `� eleven 111) to 'ourteen (14) feet along the west perimeter of the excavation, and fifteen <br /> (15) to eighteen i18) feet along the eastern perimoter. It appears that there is adequate <br /> I room for the exc��vation slopes to be laid back at safe angles using an open cut method <br /> along Colby and HE�witt Avenues, and along the eastern perimeter of the excavation in the <br /> , interior of the site, provided the excavation slopes are no greater than the limits specified <br /> ` l � in local, state and federal safety regulations. The slope should be covered with visqueen <br /> to prevent ravelling during rainy weather. <br /> ,g <br /> :.,�._ <br /> I <br /> �-. <br /> _ � <br /> , <br /> _ I Earth Consultants, Inc. <br /> f r ., <br />