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NOISE MEASUREMENT SYSTEM AND PROCEDURES <br />I. Sound Level Meter <br />The sound level meter utilized was a Model 800B Precision Sound <br />Level Meter and Analyzer manufactured by Larson & Davis Labora- <br />tories. This meter meets ANSI and IEC Standards (ANS S1.4 -1971 <br />Type I precision) and was calibrated before field measurements <br />were taken. <br />2. Procedure <br />One integrated noise measurement was taken at each location <br />illustrated on Figures 10 and 11, with the exception of sites 12 <br />and 13 where two measurements were taken. Ten minute noise level <br />recordings were used to represent the average noise level for the <br />maximum 1 -hour period. Any measurements made during off -peak <br />traffic were adjusted to peak traffic as specified in the Cal - <br />trans Noise Manual. <br />14 <br />