7B, 10-96 Update on Position Paper

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1 2.1 1 2.1 C 1 2 2.1 D 1 2 2.1 E 1 1.9 2.1 F 1 1.9 2.1 G 1 1.9 2.2 H 4 2.6 2.1 I 2 2.1 2.8 J 3 1.5 1.5 K 1 2.1 2.6 L 1 2.1 2.7 M 2 2.2 2.6 N 1 1.9 2.1 0 1 1.9 2.1 P 3 1.9 2.2 Q 3 1.9 2.2 R 2 2 2.2 S 2 1.9 2.1 T 2 2 2.3 Fig.3, bisting and 30 year predicted noise al receptors, AM and PM. Shaded values represent those locations exceeding the SWlc noise standards. Bold levels approach or exceed the FI-lW A Criteria of 69dBA. Bold and italicized levels meet or exceed the FHW A NAC Category B level of 70dBA. Figure 3 indicates that there are noise impacts identified at all of the receptors including those along Round Lake (A-J and N-T) and those to the east of Highway 10 (K-M). When noise impacts are identified, a noise balTier mitigation analysis must be perfoffi1ed. 3.0 Noise Barrier Mitigation Analysis, Round Lake With noise levels at the receptors on the east shore of Round Lake (A-J and N-T) exceeding Federal NAC, a mitigation analysis is required to detennine if measures, such as a nOise barrier, are reasonable and effective in attenuating the noise at those locations. To consider a noise barrier, one of the following factors must exist: ~ The noise standards are presently in excess of state noise standards. ;;- The predicted noise levels are expected to be in excess of the state noise standards for the design year of the project. y The noise levels are predicted to be "substantially" above current noise levels in the project design year. "Substantial" is defined as a 5dBA or greater increase in noise. ~ The predicted noise level for the design year approaches or exceeds the acceptable limit. "Approaching" is defined as noise levels being within IdBA of the FHWA Noise Barrier Analysis Highway 10 Page 4