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<br />2. Overview o/Noise & Vibration <br /> <br /> Table 2-2 <br /> Typical Noise Levels <br /> Noise Level <br />Common Outdoor Activities (dBA) Common Indoor Activities <br /> 110 Rock Band <br />Jet Fly-over at 1,000 feet <br /> 100 <br />Gas Lawn Mower at three feet <br /> 90 <br />Diesel Truck at 50 feet, at 50 mph Food Blender at three feet <br /> 80 Garbage Disposal at three feet <br />Noisy Urban Area, Daytime <br />Gas Lawn Mower at three feet 70 Vacuum Cleaner at 10 feet <br />Commercial Area Normal speech at three It <br />Heavy Traffic at 300 feet 60 <br /> Large Business Office ~ <br />Quiet Urban Daytime 50 Dishwasher Next Room <br />Quiet Urban Nighttime 40 Theater, Large Conference Room (background) <br />Quiet Suburban Nighttime <br /> 30 Library <br />Quiet Rural Nighttime Bedroom at Night, Concert Hall (back ground) <br /> 20 <br /> Broadcast/Recording Studio <br /> 10 <br />Lowest Threshold of Human Hearing 0 Lowest Threshold of Human Hearing <br /> <br />Source: Table N-2136.2 of California Departrnent of Transportation's Traffic Noise Analvsis Protocol (October 1998). <br /> <br />The City of Santa Ana uses an hourly exterior noise standard to regulate stationary sources of noise. <br />This hourly exterior noise standard has allowances for higher noise levels that would occur for shorter <br />time periods, For example, the exterior noise level standard is set at 55 dBA over 30 minutes of an hour. <br />This means that 50% of the noise levels measured in an hour can not exceed 55 dBA. The <br />corresponding noise statistic (Ln) for this is L50 which is calculated by dividing 30 minutes over 60 <br /> <br />Technical NoiJe Study for Mobil Oil Station/Car WaJh ExpanJion <br />The Planning Center <br /> <br />March 2005 . Page 8 <br /> <br />Q:\Sf 1/1 AI-Of .Oh'\ShJmtli"l} _NI!il/'Replirt-FIi\'/ILdfil <br /> <br />3t&94 <br />