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<br />Federal Signal Corporation I 2645 Federal Signal Drive I University Park, IL 60484 <br />708-534-3400 (p) I www.fedsig.com I wwww.federalsignal.com <br />SOUND PROPAGATION MO DEL <br />Federal Signal Corporation utilized ‘SoundPLAN’, an internationally recognized noise modeling software, to estimate <br />the Siren sound level. The SoundPLAN model is based on the International Standardization ISO 9613 and takes into <br />account physical effects including geometrical divergence, atmospheric absorption, ground effect, reflection f rom <br />surf aces, and screening by obstacles. <br /> <br />The environmental conditions applied in this noise model are based on the summertime daily averages for the area in <br />interest include: <br /> <br />• Humidity 67.3 % <br />• Air Pressure 1017 mbar <br />• Temperature 62.66° F <br /> <br />Siren data for this noise model includes: <br /> <br />Siren # Location Siren Type Longitude Latitude Height (ft) <br />1 4250 Old Highway 10 2001-130 93.169456 W 45.070526 N 45 <br />2 Arden Place / Snelling Ave 2001-130 93.162621 W 45.047428 N 45 <br /> <br />Note: The technical specifications on the enclosed document are only estimates. This correspondence may contain confidential information intended for the use <br />of the individual. If the reader of this is not the intended recipient, or the employee or agent responsible to deliver it to the intended recipient, you are hereby <br />notified that any dissemination, distribution or copying is strictly prohibited without written authorization from Federal Signal Corporation. Maps are generated by <br />computer simulator which are approximate anticipated coverage for outdoor sirens, that are based on a variety of factors, and do not guarantee coverage.