Agenda Packets - 1982/07/26 - Laserfiche WebLink

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pcnk hour I,LL1'11 noise levels in excess of 0fi dDA and fircus within 2n11 feel would experience levels in excess of 70 (IIIA. No-Iluild Alternative. With this alternative traffic is still anticipated to increase along the existing TII 10. Thus, noise levels will also increase.. The noise levels associated with this aliernitive would be almost identi- cal Whose for the Upgrailed'I'll III alternative. Measures to The analysis of the Ilnrcc nllcrn"lives indicated noise Minimize Harm levels in excess of both the MICA Noise Level Slfindards and PIIWA Design Noise Levels would occur AI nuuty rcceplors. 'I'horefure, noise abatement measures will be provided. 'Typical methods for abating exterior highway noise include lrnffie management, elevation, or depression of the highway, noise barriers and ]and use controls. Modification of the receptor through soundproofing and air-conditioning is another method, nithough it will lint nfreel exterior levels. Considered fill ext•am'dinnry mensurc, it is used only wife" ingmcts me severe And whrn other methods are physically infeasible or ecnnomieAllY unrensonoble. These conditions fire unlikely. " Analysis of the ullermilive ahulenlent measures indicated thin noise harriers nre the most fensible for ' the Itelocalcd TII Ill projccl. The projected noise levels with noise barriers Arc indicated in Table 19. 'I'ypicully reductions of up to 15 d11A can be achieved by barriers. Except where local fiecess to properties would require openings in barriers, (receptors 2,3,7 and 15) both the PIIWA Design Noise Levels find the MPCA dnytime Noise Level Standards can be achieved. There remains, however, some uncertainty ns to whether the �• MPCA nighttime Noise Level Standards can be achieved even with typical noise abatement measures. Much of the land adjacent to the project corridor is ~ presently vacant and thus, no activities are impacted. However, these areas will undoubtedly develop. To assure tlml additional impacts from post -construction V development are avoided requires the proper considera- tion of noise in the local planning and zoning of the area. The noise reports will assist the local municipali- ties in this effort by identifying future noise levels and land use/activities which are compatible with varying noise levels. This information call be used to prepare Plans which place the most susceptible uses away from the highway and to utilize open space, structures or other less susceptible hind uses as buffers or physical barriers. 162 L