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Grand Avenue Widening Project Environmental Impact Report Section 3.0 TABLE 3.6-14 NOISE BARRIER CALCULATIONS FOR RESIDENTIAL LOTS ON GRAND AVENUE BETWEEN FOURTH AND FIRST STREETS Mitigation Measure for Long Term Noise Impacts N-2 The City of Santa shall incorporate 5.5 foot high noise barrier walls as specified in the noise technical report in the design of the selected alternative for the widening of Grand Avenue, based on the potentially impacted properties listed in Tables 3.6-10 (Alternative 1) and 3.6- 11 (Alternative 2) in this EIR. These noise barriers shall be shown in the project specifications and shall be constructed concurrently with the construction of the widening on Grand Avenue. 3.6.6 LEVEL OF SIGNIFICANCE AFTER MITIGATION RELATED TO NOISE The potential short term noise impacts associated with construction of Alternatives 1 and 2 would be substantially mitigated based on implementation of mitigation measure N-1, above. However, the anticipated noise levels of construction equipment cannot be mitigated to below a level of significance, because of the proximity of the proposed widening project to adjacent noise sensitive land uses. Therefore, in the short term, the construction of the proposed Grand Avenue widening under Alternatives 1 and 2 would result in significant adverse noise impacts which would be substantially mitigated, but which cannot be mitigated to below a level of significance. The long term noise impacts of the proposed Grand Avenue widening under Alternatives 1 and 2 will result in adverse noise impacts on sensitive land uses adjacent to Grand Avenue. Implementation of mitigation measure N-2 above will substantially reduce these noise impacts, to within City standards and, therefore, to below a level of significance. F.IPROJ-ENVIGrand eirWew Text - GranWection 3 SplitlSection 3.6.doc Page 3.6-44 Road Centerline Base Centerline of Pad Observer Wall Noise Level Noise Location of Exposed Elevation of Grand of Grand Elevation Height Height unmitigated Level Residential Property 00 Avenue to wag Avenue to (fL) (ft) (fL) (CNEL) Mitigated Wall (ft.) (ft) Observer (CNEL) (ft. 1314 4 Street 110 169 110 174 110 5 5.5 63.0 57.6 1313 3 Street 110 169 110 174 110 5 5.5 63.0 57.6 1313 3 Street 110 169 110 174 110 5 5.5 63.0 57.6 Mitigation Measure for Long Term Noise Impacts N-2 The City of Santa shall incorporate 5.5 foot high noise barrier walls as specified in the noise technical report in the design of the selected alternative for the widening of Grand Avenue, based on the potentially impacted properties listed in Tables 3.6-10 (Alternative 1) and 3.6- 11 (Alternative 2) in this EIR. These noise barriers shall be shown in the project specifications and shall be constructed concurrently with the construction of the widening on Grand Avenue. 3.6.6 LEVEL OF SIGNIFICANCE AFTER MITIGATION RELATED TO NOISE The potential short term noise impacts associated with construction of Alternatives 1 and 2 would be substantially mitigated based on implementation of mitigation measure N-1, above. However, the anticipated noise levels of construction equipment cannot be mitigated to below a level of significance, because of the proximity of the proposed widening project to adjacent noise sensitive land uses. Therefore, in the short term, the construction of the proposed Grand Avenue widening under Alternatives 1 and 2 would result in significant adverse noise impacts which would be substantially mitigated, but which cannot be mitigated to below a level of significance. The long term noise impacts of the proposed Grand Avenue widening under Alternatives 1 and 2 will result in adverse noise impacts on sensitive land uses adjacent to Grand Avenue. Implementation of mitigation measure N-2 above will substantially reduce these noise impacts, to within City standards and, therefore, to below a level of significance. F.IPROJ-ENVIGrand eirWew Text - GranWection 3 SplitlSection 3.6.doc Page 3.6-44