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44Wf rj:c'. <br />The follpwing comments are taken a document titled " A review of <br />Minnesota's environmental noise control regulations" <br />1. A highway produced 4bdb with peaks up -to 55db. It reduced sleep <br />by 16 minutes per night,, and no adaptation was noted after 5 tears. <br />2. It was.found•that the -degree of sleep disturbance decreased with <br />the noise level, and that noise levels In the '40-50db rarige can. <br />disturb Stage 2 and Stage 3 sleep. <br />3. One of the etudes for this report recommended a 30-40db range <br />for bedrooms. The U.S. Environmental protection Agency recommenited <br />32db and Russia recommended 35db. <br />4. EPA noise levels were determined by a study of "Threats n" he,ral <br />Action" rather than a study of noise levels. <br />5. One study found that among residents living near the air1no:�i., <br />was a 50% increase in heart and circulatory pathology associ.rrte;i <br />with a 12db difference in exterior noise levels. Hyperterr:3.i:;1I <br />rates increased 1% for every 2. db increase.. <br />6 <br />• <br />_ j <br />I <br />i.i <br />i €�1 <br />+y s <br />S <br />g <br />... �. .. ._.. ._ <br />• <br />_ j <br />I <br />i.i <br />i €�1 <br />Ff <br />