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Pearson Place 2' Addition Traffic Noise Assessment <br />2.3. Compliance with State Noise Standards <br />The first method for reducing traffic noise to comply with state noise standards would be construction of <br />a noise wall along the length of the property along the highway. The effectiveness of a 12-foot-high noise <br />wall is shown below in Table 2.4. Exceedances of the state am and pm noise standards with the barrier <br />are shown in Table 2.5. <br />Table 2.4 Predicted Noise Levels (dBA) with a 12-foot Wall <br />L10 LEVELS <br />Receiver AM PM <br />H1W 62 63 <br />H2W 63 65 <br />H3W 64 66 <br />H3N 65 66 <br />H1E 62 63 <br />H2E 63 65 <br />H3E 65 66 <br />L50 LEVELS <br />Receiver AM PM <br />H1W 56 59 <br />H2W 57 60 <br />H3W 58 61 <br />H3N 59 61 <br />H1E 57 59 <br />H2E 58 60 <br />H3E 59 61 <br />Table 2.5 Exceedance of Nighttime and Daytime Standards with at 12-ft Wall <br />L10 LEVELS <br />Receiver AM - 55 PM - 65 <br />H1W 7 -2 <br />H2W 8 0 <br />H3W 9 1 <br />H3N 10 1 <br />H1E 7 -2 <br />H2E 8 0 <br />H3E 10 1 <br />L50 LEVELS <br />Receiver AM - 50 PM - 60 <br />H1W 6 4 <br />H2W 7 5 <br />H3W 8 6 <br />H3N 9 6 <br />H1E 7 4 <br />H2E 8 5 <br />H3E 9 6 <br />The limited effectiveness of the noise barrier can be seen in Figure 2.3. The receptor site closest to the <br />highway has the maximum benefit. There is a diminishing benefit of the wall as the east and west <br />receptors become more exposed to traffic. <br />David Braslau Associates, Inc. Page 8 <br />