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Table 2 <br /> Typical A-Weighted Sound Levels of Common Noise Sources <br /> Loudness Ratio Level A-Wei hted Sound Level (dBA <br /> Jet aircraft take-off at 100 feet/ Threshold of <br /> 64 120 pain <br /> 32 110 Riveting machine at operators position <br /> 16 100 Shot-gun at 200 feet <br /> 8 90 Bulldozer at 50 feet <br /> 4 80 Diesel locomotive at 300 feet <br /> 2 70 ... Commercial jet aircraft interior during flight <br /> 1 60 Normal conversation speech at 5-10 feet <br /> 112 50 Open office background level <br /> 114 40 Background level within a residence <br /> 1/8 30 soft whisper at 2 feet <br /> 1/16 20 Interior of recording studio <br /> Environmental Noise Analysis <br /> Munn&Perkins Expanded Hours of Operations— San Joaquin County <br /> Page 5 <br />