8920 EVERGREEN WAY THE RESERVE 2025-07-25

Zipper Geo Associates, LLC Reserve at Everett Project No.1117.01 May 1,2013 supported on compacted structural fill. Foundations supported on glacial till soils will experience very little post-construction settlement. Foundations supported on structural fill will experience some post-construction settlement. In order to limit excessive differential settlement between foundations supported on dissimilar soils, foundation design will need to consider variable allowable bearing pressures. • Wet Weather Construction: Site soils contain a significant fraction of fines. The reuse of site soils for structural fill will be difficult if not impossible during wet weather. Earthwork for the project should be planned for dry,summer months. The recommendations contained in this report are based upon the results of field and laboratory testing (which are presented in Appendices A and B), engineering analyses, and our current understanding of the proposed project.ASTM and Washington State Department of Transportation(WSDOT)specification codes cited herein respectively refer to the current manual published by the American Society for Testing&Materials and the current edition of the WSDOT Standard Specifications for Road, Bridge, and Municipal Construction, (M41-10). Seismic Design Considerations The tectonic setting of western Washington is dominated by the Cascadia Subduction Zone formed by the Juan de Fuca plate subducting beneath the North American Plate. This setting leads to intraplate, crustal, and interplate earthquake sources. Seismic hazards relate to risks of injury to people and damage to property resulting from these three principle earthquake sources. The seismic performance of the development was evaluated relative to seismic hazards resulting from ground shaking associated with a design seismic event with a 2,475 year return period determined in accordance with the 2009 International Building Code (IBC). Conformance to the above criteria for seismic excitation does not constitute any kind of guarantee or assurance that significant structural damage or ground failure will not occur if a maximum level earthquake occurs. The primary goal of the IBC seismic design procedure is to protect life and not to avoid all damage, since such design may be economically prohibitive. Following a major earthquake, a building may be damaged beyond repair,yet not collapse. IBC Seismic Design Parameters: Based on site location and soil conditions, the values provided below are recommended for seismic design. The values provided below are based on the 2009 IBC as the building code reference document which makes use of 2002 USGS hazard data. Upon request, we can provide seismic design parameters based on the 2012 IBC as the building code reference document. Page 5