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Geotechnical Investigation Report Detroit Lake Water Reservoir <br />Detroit, Oregon <br />Amplification <br /> – Analyses of average site response spectra with PROSHAKE (refer to Figures <br />C-3 through C-5 for response spectra plots) with 5 percent damping and multiple crustal, <br />intraslab and CSZ interface models were completed. The soil profile and input earthquake <br />parameters discussed earlier were used. These analyzes indicates that the site specific <br />spectra’s are generally bounded by the OSSC (IBC) Spectra for Soil profile SD for a 2 <br />percent in a 50-year event. We, therefore, recommend that the OSSC 2007 (2006 IBC) <br />spectra be used for project design. <br />November 23, 2009 <br />Project No. 72852.000 <br />C-5 <br />