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Orono Substation Replacement Project Noise Assessment <br /> List of Figures <br /> Figure 1.1 Substation and Adjacent Residences 2 <br /> Figure 1.2 Location of Sound Level Monitoring Sites 3 <br /> Figure 3.1 24-Hour Statistical Sound Levels(10-minute intervals) (Dec.5,2011 10:40 <br /> a.m.to midnight to Dec.6,2011,midnight to 10:40 a.m.) 6 <br /> Figure 4.1 Proposed Substation Replacement Layout 8 <br /> Figure 4.2 Predicted Sound Levels by Alternative without Mitigation 9 <br /> Figure 4.3 Proposed Sound Walls 11 <br /> List of Tables <br /> Table 1.1 Minnesota Noise Standards 1 <br /> Table 3.1 Ambient Sound Levels with the Existing Orono Substation 5 <br /> Table 4.1 Proposed Transformer Alternatives 7 <br /> Table 4.2 Predicted Sound Reduction Benefits of Sound Walls(without Sound <br /> Absorption Material) 10 <br /> Table 4.3 Predicted Sound Reduction Benefits of Sound Walls with a 78 dBA and 68 <br /> dBA Transformer(without Sound Absorption Material) 12 <br /> David Braslau Associates,Inc. <br />