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Geotechnical Engineering Report <br /> lierracon <br /> Merrill Creek Operations Base Expansion Everett, Washington <br /> ' December 14, 2020 Terracon Project No. 81205012 GeoReport <br /> • <br /> • <br /> DESIGN <br /> FOOTNGLEVEI B <br /> 1 STRUCTURAL <br /> I p <br /> RECOMMENDED ! <br /> EXCAVATION LEVEL <br /> OVER-EXCAVATION/BACKFILL ZONE <br /> NOTE:EXCAVATIONS ARE SHOWN VERTICAL.HOWEVER,THE <br /> SIDEWALLS SHOULD BE SLOPED AS NECESSARY FOR SAFETY <br /> SEISMIC CONSIDERATIONS <br /> Description Value <br /> 2015 International Building Code(IBC)Site Classification D=stiff soil <br /> Site Latitude 47.9340036 <br /> ' Site Longitude -122.250539 <br /> Ss —Short Period Spectral Acceleration,Site Class B 2 1.438 g <br /> -1-Second Period Spectral Acceleration, Site Class B 2 0.550 g <br /> Fa —Short Period Site Coefficient 2 1.0 <br /> F„-1-Second Period Site Coefficient2 1.5 <br /> ' PGA-ASCE 7, Peak Ground Acceleration 0.610 g <br /> FPGA-Peak Ground Acceleration Site Coefficient 1.0 <br /> ' The IBC requires a site profile extending to a depth of 100 feet for seismic site classification. Borings were <br /> extended to a maximum depth of 411/2 feet. The site properties below the boring depth to 100 feet were <br /> estimated based on our experience and knowledge of geologic conditions of the general area. <br /> ' 2. These values were obtained using online seismic design maps and tools provided by the Applied <br /> Technology Council (https://hazards.atcouncil.orq/) which reference ASCE 7-10 values for the 2015 IBC <br /> edition. <br /> Surface-Fault Rupture <br /> ' The hazard of damage from onsite fault rupture appears to be low based on review of the USGS <br /> Earthquake Hazards Program Quaternary Faults and Folds Database available online <br /> ' (https://usgs.maps.arcgis.com/apps/webappviewer/index.html?id=5a6038b3a1684561 a9b0aadf <br /> 88412fcf) accessed on July 31, 2020. The closest mapped fault is the northernmost splay of the <br /> South Whidbey Island fault zone, which lies approximately 21/2 miles to the southwest, and passes <br /> ' beneath Paine Field. This fault splay (and the fault zone) trends northwest-southeast. <br /> Responsive • Resourceful • Reliable <br />