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ten percent of the time. Similarly, L50 and L90 are exceeded 50 percen <br /> and 90 percent of the time respectively. <br /> Because community or urban noise receptors are more sensitive t <br /> unwanted sound intrusion during evening and night hours, state la <br /> requires that an artificial decibel increment be added to noise levels <br /> during these hours. This results in a 24-hour noise descriptor known asl <br /> the Community Noise Equivalent Level (CNEL) . Five dB are added to noise <br /> levels between the hours of 7:00 PM and 10:00 PM. Ten dB are addedi <br /> between the hours of 10:00 PM and 7:00 AM. <br /> 1� <br /> ' D-3 <br /> 104-61.R4 4/I0/89 <br />