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4 r+ w i <br /> 4 <br /> TABLE 7.6 <br /> TYPICAL NOISE LEVELS FOR COMMON NOISE SOURCES IN dBA1 <br /> Overall Quality dBA Outdoor <br /> Indoor <br /> Uncomfortably loud 130 50-horsepower siren --- <br /> at 100 feet <br /> 120 Jet take-off at • <br /> 200 feet <br /> 110 Rock-n-roll Band <br /> Very loud 100 Jet flyover at 1 ,000 Newspaper <br /> feet, poer mower press <br /> w <br /> 90 Motorcycle at 25 ft. Food Blender <br /> 80 High urban ambient <br /> sound; passenger Garbage disposal , <br /> car, 65 miles per clothes washer <br /> hour at 25 feet <br /> 70 TV audio, vacuum <br /> CESS/fh /72._ lo/ 4/EM cleaner <br /> • 60 Air conditioner at Electric t <br /> 20 feet typewriter <br /> conversation <br /> Quiet 50 Light traffic at <br /> Average residence <br /> 100 feet <br /> 40 Bird calls , lower --- <br /> limit urban ambient <br /> sound <br /> Very quiet 30 <br /> Soft whisper • <br /> Just audible 20 ___ <br /> Television studio, <br /> leaves rustling <br /> 10 --- <br /> Threshold of hearing O <br /> 1The decibel A (dBA) system is a scale of noise intensity that allow <br /> for the effect of pitch on s <br /> noise measurement, high-pitched sounds are sweighted hmore yheavily than low- <br /> pitched ones. <br /> Source: U.S. Department of Health, Education and Welfare. <br /> *Sou(ice ; FEDERAL /7 Vo/37)ov /1-6A11A/, --' !7v✓,ScRr Ci,ecc'i,/1R 36 -3C <br /> 7 . 17 <br /> A,. <br />