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Staff notes the air quality impacts listed above are primarily a function of the size of the project. Although the DSEIR includes Mitigation Measures requiring dust control and other construction -period pollution reduction measures, and implementation of Transportation Demand Management (TDM) measures, these measures would not be sufficient to reduce the air emissions of the JDEDZ to a Tess -than -significant level. Thus, should the City Council elect to certify the SEIR, a finding of overriding considerations would need to be made for these air quality impacts (i.e., that even though a project would result in one or more unavoidable adverse impacts, specific economic, social or other stated benefits are sufficient to warrant project approval). Significant and Unavoidable Transportation Impacts The JDEDZ will generate increased traffic, affecting the levels of service for freeway ramps along 1-680 and surface streets in and around the project area. It should be noted that proposed transportation mitigation improvements in the DSEIR would result in acceptable levels of service (i.e., duration of delay in traveling through an intersection), acceptable vehicle queue spillback (i.e., backed -up traffic potentially affecting operation of an upstream intersection), and acceptable freeway ramp operations. However, traffic impacts are characterized as significant and unavoidable because some of the needed improvements require approval by Caltrans and thus are outside the immediate control of the City. The graphics below (Figures 2 and 3) provide an overview of the required transportation mitigation improvements resulting from the implementation of the JDEDZ. For more detailed information, please refer to Chapter 4.D of the DSEIR (Attachment 2). Similar to the air quality impacts described above, should the City Council elect to certify the SEIR, a finding of overriding considerations would need to be made for these transportation impacts. Other impacts from the JDEDZ on aesthetics, air quality, biological resources, cultural resources, geology and soils, greenhouse gas emissions, hazards and hazardous materials, hydrology and water quality, land use and planning, noise, population and housing, public services and utilities systems, transportation and traffic, and recreation would be mitigated (when appropriate) to Tess than significant levels. The mitigation measures are generally typical of measures applied to development in Pleasanton, such as dust control during construction; pre -construction surveys to avoid impacts on birds, bats or burrowing owls; protection of waterways and riparian vegetation; archaeological monitoring for archaeologically sensitive sites; Phase 1 environmental assessments required to assess and remediate any hazardous materials on sites; a limitation on the hours of construction; and vibration and acoustical studies to determine appropriate construction techniques and sound mitigation for new buildings. Page 10 of 22