06/25/2003 Env Bd Packet - Laserfiche WebLink

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MAY.24 '96 14:45 FROM nAUID BRASLAU ASSOC • 3.0 RESPONSES TO QUESTIONS FROM MEETING ON 16 APRIL 1996 41114111 111.- IS • • 1 • Ness- PAGE.007 Readings were taken at several locations in and around the dome. Some general findings are presented below. • The only sound that was detectable at the emergency doors was air leaking around the door itself, callcing a sound level of 64 dBA. This would drop to about 35 dBA at the nearest residence andwould probably not be audible. • The loudest noise observed was from a vent on the adjacent building which provided heat and pressure. At 3 feet this measured 75 dBA. Even if this were =shielded, it wauid drop to about 35 dBA at the nearest residence. When shielded by the bleachers it would be even lower. • One unexpected sound that was observed could be a problem if not contained. Only two students were kicking a soccer ball towards a goal inside the dome; when they missed, the impact of the ball on the dome was somewhat akin to a weak drum and has the potential for being somewhat disturbing. The impact level measured 62 dBA at 15 feet and could be as high as 50 dBA at the nearest residence. Since as many as 20 students might be shooting goals at any one time, it is critical that a net be hung inside. the dome where a ball could impact the dome wall at a relatively high velocity. This is evidently common at some othcr locations. • The readings are summarized in the table below. r Location/sound source Air outlet inside dome (@3 ft) 'Center of dome Emergency door (inside dome)(@ 3 ft) Emergency door (outside dome)(@ 3 ft) Ball impact against dome (@15 feet) Typical. Sound Level (dBA) - 68 "Heater" vent (@3 ft) 59 63 0.1111■• 62 64 75 RECEIVED •JUN 09 2003 CITY OF LINO LAKES Academy of the Holy Angela - Noise Assessment Page 5