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Orono Substation Replacement Project Noise Assessment <br /> Table 4.3 Predicted Sound Reduction Benefits of Sound Walls with a 78 dBA and 68 <br /> dBA Transformer(without Sound Absorption Material) <br /> With <br /> No Walls Walls Benefit <br /> Home (dBA) (dBA) (dBA) <br /> 1 42.3 36.7 5.7 <br /> 2 40.9 35.4 5.6 <br /> 3 46.7 41.1 5.6 <br /> 4 45.3 40.7 4.5 <br /> 5 49.8 44.3 5.5 <br /> 6 40.7 35.1 5.6 <br /> 7 42.5 36.9 5.6 <br /> While all of the sound levels are predicted to be below the L50 50 dBA nighttime standard <br /> without any mitigation,levels would be at least 6 dBA below the standard and closer to the <br /> existing ambient levels in the neighborhood if the sound walls were installed. <br /> David Braslau Associates,Inc. Page 12 <br />