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Spann Engineering, LLC <br />Apri129, 1998 <br />Page 2 <br />V <br />Values of peak and effective horizontal bedrock accelerations for 90% values of <br />non-exceedance may be derived from the seismic hazazd curves shown on the <br />attached Figure 8. Response spectra for maximum earthquake ground motions and <br />5%, 7% and 10% of critical damping at the 50th and 84th percentiles aze illustrated <br />on the attached Figures 9, 10 and 1 I, respectively. <br />The information in the attached report is intended to provide an assessment <br />of earthquake hazard and ground motions for dynamic analysis of the proposed <br />Trout Creek dam. It is based on review of available geological and seismological <br />literature, earthquake catalogs compiled from various sources, our general <br />experience with the proposed construction, and past experience with similaz <br />conditions. The conclusions and recommendations presented in this report aze <br />subject to the limitations and explanations contained herein. The economic and <br />technical performance of the project cannot be guazanteed in any respect. <br />We have enjoyed working with you on this interesting project. If you have <br />questions or if we may be of further service, please do not hesitate to call. <br />Very truly yours, <br />MICHAEL W. WEST & <br />By: Michael W. West, Ph.D., <br />President <br />Attachment <br />