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TOWN OF TRUCKEE
<br />CANYON SPRINGS DRAFT EIR
<br />NOISE
<br />4.11-2
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<br />while the Ldn and CNEL are measures of community noise. Each is applica-
<br />ble to this analysis and defined as follows:
<br />¤ Leq, the equivalent energy noise level, is the average acoustic energy con-
<br />tent of noise for a stated period of time. Thus, the Leq of a time-varying
<br />noise and that of a steady noise are the same if they deliver the same
<br />acoustic energy to the ear during exposure. For evaluating community
<br />impacts, this rating scale does not vary, regardless of whether the noise
<br />occurs during the day or the night.
<br />¤ Ldn, the Day-Night Average Level, is a 24-hour average Leq with a 10 dBA
<br />“weighting” added to noise during the hours of 10:00 p.m. to 7:00 a.m. to
<br />account for noise sensitivity in the nighttime. The logarithmic effect of
<br />these additions is that a 60 dBA 24 hour Leq would result in a measure-
<br />ment of 66.4 dBA Ldn.
<br />¤ CNEL, the Community Noise Equivalent Level, is a 24-hour average Leq
<br />with a 5 dBA “weighting” during the hours of 7:00 p.m. to 10:00 p.m.
<br />and a 10 dBA “weighting” added to noise during the hours of 10:00 p.m.
<br />to 7:00 a.m. to account for noise sensitivity in the evening and nighttime,
<br />respectively. The logarithmic effect of these additions is that a 60 dBA 24
<br />hour Leq would result in a measurement of 66.7 dBA CNEL.
<br />¤ Lmin is the minimum instantaneous noise level experienced during a given
<br />period of time.
<br />¤ Lmax is the maximum instantaneous noise level experienced during a given
<br />period of time.
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<br />B. Regulatory Framework
<br />The following section summarizes the regulatory framework related to noise,
<br />including federal, State, and Town of Truckee plans, policies, and standards.
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