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Table 3.6-1 <br /> Weighted Sound Levels and Human Response <br /> Sound Source dB(A)I Response Criteria <br /> Carrier Deck Jet Operation ----140 <br /> Painfully Loud <br /> ----130 Limit Amplified Speech <br /> Jet Takeoff (200 feet) ----120 <br /> Discotheque Maximum Vocal Effort <br /> Auto Horn (3 feet) <br /> Riveting Machine ----1 10 <br /> Jet Takeoff (2,000 feet) <br /> Shout (0.5 feet) ----100 <br /> New York Subway Station Very Annoying <br /> Heavy Truck (50 feet) -----90 Hearing Damage (8 hours) <br /> Pneumatic Drill (50 feet) <br /> -----80 Annoying <br /> Freight Train (50 feet) <br /> Freeway Traffic (50 feet) -----70 Telephone Use Difficult <br /> Intrusive <br /> Air Conditioning Unit (20 feet) -----60 <br /> Light Auto Traffic (50 feet) <br /> -----50 Quiet <br /> Living Room <br /> Bedroom -----40 <br /> Library <br /> Soft Whisper (15 feet) -----30 Very Quiet <br /> Broadcasting Studio -----20 <br /> -----10 Just Audible <br /> ------0 Threshold of Hearing <br /> 1 Weighted sound levels taken with a sound-level meter and expressed <br /> as decibels on the scale. <br /> Source: U.S. Council on Environmental Quality 1970. <br /> 81 <br />