Minnesota Department of Transportation | Twin Ports Interchange Noise Study Memo 1 Memo Date: Tuesday, October 31, 2017 Project: Twin Ports Interchange Noise Study To: Roberta Dwyer From: Tim Casey Subject: Outdoor noise measurement results HDR Engineering, Inc. (HDR) measured existing noise levels in the study area at four residential locations that are representative of noise-sensitive land uses in their immediate surroundings. To gain a more complete understanding of how environmental noise levels vary in both peak and non-peak traffic hours, HDR measured existing noise outdoors for a continuous 24-hour period at all four locations. HDR also performed short-term noise measurements at two additional locations for traffic noise model validation purposes. The measurements began on October 12, 2016 and ended on October 13, 2016. The following graphs show the hourly results of those 24-hour noise measurements. The short-term model validation results have not been processed yet, because the noise modeling task has not yet begun. This memo does not offer any interpretation of the data; rather it simply demonstrates the performance and completion of these 24-hour noise measurements. HDR performed the measurements at locations shown in Table 1. Table 1 – Measurement Locations Measurement Location ID Address in Duluth, MN ML-1 122 N 19 th Ave W ML-2 2011 W 2 nd St ML-3 2119 W 2 nd St ML-4 2212 W 2 nd St ML-A 314 N 19 th Ave W ML-B 2212 W 2 nd St
Transcript
Minnesota Department of Transportation | Twin Ports Interchange Noise Study Memo
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Memo Date: Tuesday, October 31, 2017
Project: Twin Ports Interchange Noise Study
To: Roberta Dwyer
From: Tim Casey
Subject: Outdoor noise measurement results
HDR Engineering, Inc. (HDR) measured existing noise levels in the study area at four residential locations
that are representative of noise-sensitive land uses in their immediate surroundings. To gain a more
complete understanding of how environmental noise levels vary in both peak and non-peak traffic
hours, HDR measured existing noise outdoors for a continuous 24-hour period at all four locations. HDR
also performed short-term noise measurements at two additional locations for traffic noise model
validation purposes. The measurements began on October 12, 2016 and ended on October 13, 2016.
The following graphs show the hourly results of those 24-hour noise measurements. The short-term
model validation results have not been processed yet, because the noise modeling task has not yet
begun. This memo does not offer any interpretation of the data; rather it simply demonstrates the
performance and completion of these 24-hour noise measurements.
HDR performed the measurements at locations shown in Table 1.
Table 1 – Measurement Locations
Measurement Location ID Address in Duluth, MN
ML-1 122 N 19th Ave W
ML-2 2011 W 2nd St
ML-3 2119 W 2nd St
ML-4 2212 W 2nd St
ML-A 314 N 19th Ave W
ML-B 2212 W 2nd St
Minnesota Department of Transportation | Twin Ports Interchange Noise Study Memo
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Figure 1 - Noise Measurement Results at ML1
Figure 2 - Noise Measurement Results at ML2
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Minnesota Department of Transportation | Twin Ports Interchange Noise Study Memo
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Figure 3 - Noise Measurement Results at ML3
Figure 4 - Noise Measurement Results at ML4
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Minnesota Department of Transportation | Twin Ports Interchange Noise Study Memo
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Figure 5 - Noise Measurement Summary (Ldn)
Figure 6 - Noise Measurement Comparison during 14:00 Hour
The following figure is a map that shows the measurement locations.
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Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics,CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GISUser Community
