Agenda - Environmental Policy Board - 10/15/2018

Home

Table 24.2: Equivalent Leg values for MPCA Noise Level Standards Equivalent MPCA Noise Level Standards Classification Land Use Daytime Noise Level [dBA] Nighttime Noise Level [dBA] (7a.m. - 10 p.m.) (10 p.m. - 7 a.m.) NAC-1 Residential Leq of 62 Leq of 52 NAC-2 Commercial Leq of 67 Leq of 67 NAC-3 Industrial Leq of 77 Leq of 77 Noise Level Monitoring Background noise level monitoring is performed during a noise study to measure existing noise levels. These levels are often used as a baseline against which modeling scenarios can be compared. They are also used to validate computer -generated results. Monitoring at receptor -1d13" was performed as part of the Northstar Corridor Project Final Environmental Impact Statement, March 2002. Receptor -1d13" is located on the northwest corner of the intersection of Highway 10 and Ramsey Boulevard (shown in Figure 24.1) and was used in this report as the background noise level monitoring location for the site. Table 24.3: Monitored Existing Noise Levels for Receptor M3 Monitoring Site [dBeA] Primary Noise Sources M3 62 Airplanes/Cars Source: Northstar Corridor Project Final Environmental Impact Statement, March 2002 Noise Modeling Methodology A noise analysis was conducted to assess the extent to which the proposed project will affect future noise levels. The analysis was performed using Traffic Noise Model v. 2.1 (TNM). The noise model uses traffic volumes, vehicle type mix, vehicle speed, receptor locations, and road alignment to calculate noise levels. TNM is approved by the Federal Highway Administration for modeling traffic noise. For the purpose of this study, 58 noise receptors were chosen to represent each of the 58 proposed blocks of land presented in Figure 24.2. Each block was assigned a land use according to the Ramsey Town Center Preferred Design Schematic shown in Figure 6.1 located in Item 6. Residential and public space areas (shown in brown and green) were classified as NAC-1 noise receivers. All other parcels fall under the NAC-2 commercial classification previously discussed. An additional noise receptor was placed at the northwest corner of the intersection of Highway 10 and Ramsey Boulevard to compare modeled results with the existing noise level at monitoring site -M3". Modeling for receptor -M3" was performed using the current traffic volumes for the AUAR project area. Speed limits and vehicle mix were taken from the traffic analysis of Item 21. The modeled results differ somewhat from the measured noise levels but are 23/24-3