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Grand Avenue Widening Project Environmental Impact Report Section 3.0 the proposed project under Alternatives 1 or 2. No further mitigation is required for short term air quality impacts under Alternative 2. As described earlier in Section 1.0 (Project Description and Project Objectives), it is anticipated that the widening of Grand Avenue under Alternative 2 will be constructed in phases, based on available funding. For example, as funding becomes available, the intersections could be improved, followed later by the widening of Grand Avenue on the segments between the intersections. Therefore, the demolition and construction for the widening under Alternative 2 would not occur in one continuous time period. Demolition and construction activities could occur intermittently over a period of several years before construction of the entire widening project is complete. Therefore, these potential air quality impacts could occur over time, as short segments of the Grand Avenue widening is constructed. however, even with phased construction, the construction related emissions of the proposed Grand Avenue widening under Alternative 2 would not be significant. Long Term Air Quality Impacts Under Alternative 2 Local Area Air Qualitv. The CALF M4 computer modeling results for the buildout year for the Grand Avenue widening, 2020, shown earlier in Table 3.4-3 would be the same for Alternative 2 as the traffic volumes on Grand Avenue would be similar under Alternatives 1 and 2. Therefore, Alternative 2 will not result in adverse impacts on local air quality and will contribute to a reduction in CO levels for one and eight hour periods, compared to both existing conditions and the future No Project Alternative. Regional Air Qualitv. Increases in CO levels in the region compared to existing conditions were projected with and without the proposed Grand Avenue widening. Under the No Project Alternative, future traffic at the intersections along Grand Avenue will be very congested as described earlier. With the proposed Grand Avenue widening under Alternative 2, air quality is projected to improve since it will alleviate heavy traffic congestion at these intersections. It is anticipated that, with the implementation of the proposed Grand Avenue widening, CO emissions will be reduced with respect to the No Project Alternative although the amount of this emission reduction can not be quantified. In summary, the proposed Grand Avenue widening under Alternative 2 would beneficially affect regional air quality. Impacts Related to Consistency with SCAG Air Quality Policies The SCAG air quality policies, from the Regional Comprehensive Plan and Guide, were shown earlier in Table 3.4-4. Alternative 2 was evaluated for consistency with each of these policies. As shown in Table 3.4-4, Alternative 2 is consistent with policy 5.11. Policy 5.07 was determined not to apply to this proposed project. Therefore, Alternative 2 will not result in adverse impacts related to SCAG air quality policies. 3.4.5 MITIGATION RELATED TO AIR QUALITY As discussed above, Alternatives 1 and 2 and the No Project Alternative will not result in adverse impacts related to air quality and the SCAG air quality policies. No mitigation is required. F: IPROJ-ENVIGrand eirlNew Text- GrandlSection 3 SpIMSection 3.4.doc Page 3.4-14