Except as qualified by section 20-34, when measuring vehicular noise, this section describes acceptable methods and techniques for the measurement and reporting of noise for the purpose of determining compliance with the allowable noise levels listed in section 20-31.
(1) Measurement location. Measurement of sound shall be made at any point beyond (outside) the property line of the property where the noise originates; provided, however, when sound is measured on town property, the point of measurement shall be at least 50 yards from the property line of the property where the sound originates.
(2) Calibration. All sound level measuring devices shall be calibrated by a certified agency, at a minimum once each year.
(3) Sound level meter. Sound level measurement shall be made with a sound level meter using the A-weighting scale, set on "slow" response.
(4) Use of sound level meters. Sound level meters shall be at least Type II meeting American National Standard Institute (ANSI S1.4-1983) requirements. Persons using the sound level meters shall be trained in sound level measurement and the operation of sound level measurement equipment.
(5) Measurement procedures. The following procedures shall be followed to obtain representative sound level measurements:
a. Measurement location shall be at least three feet above the ground and not more than ten feet above ground.
b. Measurement shall be taken with line of sight to the noise source if possible.
c. Measurements shall be made with the sound level meter set for "A" weighting and "slow" response.
(6) Data documentation. A record of all sound level measurements shall be completed and signed by the person making the measurements. The record sheet should include the following:
a. Date.
b. Time of measurement.
c. Location (street address if possible).
d. Noise source.
e. Make, model and serial number of sound level meter and the date of last certification/calibration.
f. Field calibration results.
g. Name of complainant (if provided).
(Code 1989, § 84A.06)