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structures built prior to enactment and enforcement of the State Noise Insulation <br /> Standards (Title 24) and CEQA requirements to assess and mitigate potential noise <br /> I impacts. Mitigation in- this situation may be infeasible due to the costs of retrofilling <br /> older structures with noise attenuation, the inability to construct effective sound walls <br /> (since many structures front on the corridor) and the inability to provide sufficient <br /> setbacks between the road corridor and existing structures. Because the extent of <br /> impacts cannot be fully determined at this time, it is conservatively assumed that project <br /> implementation may result in unavoidable, significant adverse noise impacts. <br /> However, due to the potential for noise-sensitive uses within the project area an <br /> acoustical analysis will be completed prior to construction of the roadway and all' <br /> feasible mitigation measures as identified will be implemented. <br /> Conclusion <br /> Based on the previously described social, economic and other benefits or <br /> considerations of the ,project and the additional overriding considerations described <br /> above, the benefits of the proposed project outweigh the potential impacts related to <br /> noise and any adverse environmental effects associated with these impacts may be <br /> corisderetl to be`acceptable <br /> %'#w ,lAir"Ouhlity ., a.7w r i s Y 3 z 4`S 7 t t ' 't IY...y: 4'• _..} k n - 'c ` i! .3 tif�r:y .11�i <br /> Si 6 riificant Unavoidable Adverse lrnl2AcV <br /> 1. Traffic on the proposed.arterial could cause exceedance of state and federal carbon <br /> monoxide standards. <br /> Overriding.Considerations <br /> The City of Stockton and San Joaquin County have implemented measures a <br /> under their control to ensure that localized carbon monoxide concentrations will be <br /> minimized. -Specifically, the road corridor has been designed to- minimize traffic <br /> congestion and-promote the free flow of traffic, which will minimize the potential for <br /> carbon monoxide "hot spots." As individual phases of the Arch-Sperry project are <br /> proposed, subsequent environmental review will be completed and additional mitigation <br /> will be proposed as warranted (e.g., modification of intersection design to minimize <br /> 18 <br />