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<br /> <br /> <br /> <br />Contents <br />Evaluation of Current System ................................................................................................................4 <br />Acoustic Criteria of Siren System .....................................................................................................4 <br />Siren Configuration of Ramsey County MN ...................................................................................5 <br />Siren Sound Output ..............................................................................................................................6 <br />Meteorological Conditions ..................................................................................................................6 <br />Ground Cover and Topography .........................................................................................................6 <br />Siren Location Sitting ...........................................................................................................................7 <br />Siren Contour Plotting .........................................................................................................................7 <br />Siren Acoustic Computer Model Anal ysis ......................................................................................7 <br />Atmospheric Conditions Effect on Siren Range ...........................................................................8 <br />Ground effects on sound absorption and attenuation ................................................................9 <br />Wind shadow effect in the upw ind direction ............................................................................... 10 <br />Siren System Sound Level Compliance Discussion ................................................................. 11 <br />Appendix A Sound Coverage Maps ................................................................................................... 12 <br />Appendix B Weather Data for Ramsey County MN ..................................................................... 15 <br />Appendix C Siren Location Information .......................................................................................... 17 <br /> <br /> <br />