634.08  IMMEDIATE THREATS TO HEALTH AND WELFARE.
      (a)   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 Table 3 or Table 4 herein 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 FIFTY FEET OR FIFTEEN
   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 twenty-four hours.
   TABLE 4
   IMPULSIVE SOUND LEVELS WHICH POST AN IMMEDIATE THREAT TO
   HEALTH AND WELFARE (MEASURED AT FIFTY FEET OR FIFTEEN
   METERS)
      Sound Level Limit (dB)      Number of Repetitions
                     Per 24-hour Period
         145               1
         135               10
         125               100
   (b)   Whoever violates this section is guilty of a minor misdemeanor, provided the violation is not committed willfully or knowingly, in which case it is a misdemeanor of the fourth degree. A separate offense shall be deemed committed each day during or on which a violation occurs or continues. Punishment shall be as provided in Section 698.02.
(Ord. 1980-144. Passed 9-16-81.)