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The NAC-1 daytime standards are designed to prevent speech interference in areas for outdoor <br />activities. Areas for outdoor activities are not allowed if these noise levels are exceeded. <br />III. Noise Monitoring <br />SBP conducted noise monitoring in order to assist in the determination of existing noise levels <br />and to confirm the accuracy of the noise modeling. SBP conducted monitoring on July 22, 2020 <br />at two locations near Nowthen Boulevard NW. The monitoring locations are shown in Figure 1. <br />SBP conducted traffic counts during the monitoring. <br />Monitoring was conducted with a Sinus Apollo sound analyzer. The analyzer was periodically <br />field calibrated during the testing. Monitoring was conducted consistent with MPCA procedures. <br />Monitoring was conducted for periods of 30 minutes in length. <br />The following table presents the results of the noise monitoring. <br />Table 1 <br />Noise Monitoring Results — July 2, 2020 <br />Rum River Prairie Development, Ramsey, MN <br />Location <br />Time <br />Measured Noise <br />Levels (dBA) <br />Modeled Noise <br />Levels (dBA) <br />Measured vs. <br />Modeled Noise <br />Levels (dBA) <br />Lio <br />L50 <br />Lio <br />L50 <br />Lio <br />L50 <br />M1 <br />3:00pm <br />to <br />3:30pm <br />62.9 <br />56.7 <br />63.4 <br />55.5 <br />0.5 <br />-1.2 <br />M1 <br />3:40pm <br />to <br />4: l Opm <br />63.6 <br />57.7 <br />64.3 <br />56.8 <br />0.7 <br />-0.9 <br />M2 <br />3:00pm <br />to <br />3:30pm <br />59.5 <br />53.0 <br />59.9 <br />52.7 <br />0.4 <br />-0.3 <br />M2 <br />3:40pm <br />to <br />4: l Opm <br />60.5 <br />55.0 <br />60.8 <br />54.0 <br />0.3 <br />-1.0 <br />The modeling results show good agreement with the monitoring results. <br />The monitoring data shows the site noise levels to be below the State daytime standards for each <br />of the monitoring periods at each location. <br />