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515.08 IMMEDIATE THREATS TO HEALTH AND WELFARE.
   No person shall operate, cause to be operated or permit on public or private property any source of continuous and/or impulsive sound in such a manner as to create a sound level which exceeds the limits set forth in Tables 3 or 4 when measured at a distance of fifty feet or fifteen meters from such source.
 
TABLE 3. CONTINUOUS SOUND LEVELS WHICH POSE AN IMMEDIATE
THREAT TO HEALTH AND WELFARE (MEASURED AT 50 FEET OR 15 METERS)*
 
Sound level limit (dBA)
Duration
90
24 hours
93
12 hours
96
6 hours
99
3 hours
102
1.5 hours
105
45 minutes
108
22 minutes
 
         * Use equal energy time-intensity trade-off if level varies; find energy equivalent over 24 hours.
TABLE 4. IMPULSIVE SOUND LEVELS WHICH POSE AN IMMEDIATE
THREAT TO HEALTH AND WELFARE (MEASURED AT 50 FEET OR 15 METERS)
 
 
Sound level limit (dB)
Number of repetititions per
24 hour period
145
1
135
10
125
100
 
(Ord. 66-76. Passed 12-6-76. )