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Seismic Design Category Date: 5/15/2018 <br /> Site BU : 815285 CROWN <br /> Site Name : LOWELL CASTLE <br /> A. 428150 Rev. 0 <br /> Site information <br /> Site Latitude= 47.0 ° 57.0 56.3 „ <br /> Site Longitude = -122.0 ° 11.0 44.3 <br /> Site Class = D-Stiff Soil <br /> Spectral Response Acceleration Short Periods, Ss= 1.324 <br /> Spectral Response Acceleration 1 s Period, Si = 0.503 <br /> Seismic Category Determination <br /> Site Class Amplification, Fa= 1.00 <br /> Site Class Amplification, Fv= 1.50 <br /> 1-S Period Response Acceleration Parameter, SD1= 0.50 <br /> Short Period response Acelleration Parameter,SDs = 0.88 <br /> Seismic Category Based on SDI= D <br /> Seismic Category Based on SDs= D <br /> Overall Seismic Design Category= D <br />