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Geotechnical Engineering Report <br /> Staples Rockery Failure ■ Everett,Washington lerracon <br /> March 8, 2019 • Terracon Project No. 81175122 <br /> Risk of damage from onsite fault rupture appears to be low based on review of the Washington. <br /> State Department of Natural Resources Geologic Hazards interactive map accessed on January <br /> 2, 2018. The site is nearest to the mapped Southern Whidbey Island fault, which is approximately <br /> 4 miles south of the site at the nearest trace. <br /> The term liquefaction refers to a phenomenon by which saturated soil develops high pore water <br /> pressures during seismic shaking and, as a result, loses its strength characteristics. This <br /> phenomenon generally occurs in areas of high seismicity, where groundwater is relatively shallow <br /> and where loose granular soil (mainly sands) or non-plastic fine-grained soil (mainly silts) is <br /> present. Because evidence of groundwater was not encountered within the loose to medium <br /> dense granular soils, a liquefaction hazard does not appear to be present at the site. <br /> 4.4 Lateral Earth Pressures <br /> A retaining wall system using soldier piles with one row of tiebacks can be constructed to resist <br /> the lateral loading from the retained soils assuming earth pressures at least equal to those <br /> indicated below. <br /> LATERAL EARTH PRESSURE DIAGRAM FOR SOLDIER PILES WITH ONE TIEBACK <br /> CK <br /> ft, MI <br /> TIEBACKM <br /> AI4CHcft TIEBACK <br /> FORCE NC.-LOAD `i al <br /> ZONE <br /> p II <br /> TIEBACK <br /> 14! II <br /> i SONO f A PP'APMNT NI <br /> ZONE EARTH <br /> PRESSURE 111 <br /> -r- <br /> ll� <br /> CUT UNE N <br /> 7 Hot T I <br /> 45174 <br /> 5 FT <br /> .ter- <br /> MII'L <br /> B <br /> B( ' <br /> PASSIVE PRESSURE <br /> 4ALLOAASILE) <br /> 1 <br /> Earth Pressure Coefficients <br /> Responsive• Resourceful • Reliable 10 <br />