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Figure 3: Conceptual Designs for the JDEDZ Transportation Mitigation Measures
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<br /> Partial Recirculated Draft Supplemental Environmental Impact Report (RDSEIR) Conclusions
<br /> As explained in the Environmental Background section above, the documents comprising the
<br /> RDSEIR were prepared to update and expand upon analysis in the DSEIR. During the time
<br /> between publication of the DSEIR and preparation of the RDSEIR, the JDEDZ project
<br /> description and project details were refined. These refinements, along with updated analysis
<br /> and methodologies, resulted in changes to the conclusions in the DSEIR related to air quality
<br /> impacts only. The RDSEIR found that certain less than significant air quality impacts could be
<br /> potentially significant, but they could be mitigated to less than significant levels with an
<br /> identified, new mitigation measure. The RDSEIR found the three air quality impacts that the
<br /> DSEIR previously identified as significant and unavoidable are actually all less than significant.
<br /> The rest of the conclusions in the DSEIR and FSEIR remain the same. The Supplemental
<br /> Recirculation Memo (Exhibit D) explains and summarizes the RDSEIR conclusions as follows:
<br /> • The Health Risk Assessment found less than significant project-level and cumulative
<br /> impacts due to exposure of sensitive receptors to toxic air contaminants.
<br /> • The Updated Air Quality Analysis found that changes to the JDEDZ project details could
<br /> increase construction-related criteria pollutant emissions, but those emissions could be
<br /> reduced to a less than significant level with mitigation (i.e. new Mitigation Measures M-
<br /> AQ-1 and M-AQ-2).
<br /> • The Updated Air Quality Analysis found that conclusions regarding all three previously
<br /> identified significant and unavoidable air quality impacts related to JDEDZ operations
<br /> are less than significant.
<br /> • The Greenhouse Gas ("GHG") Analysis found that the JDEDZ would not have
<br /> significant GHG-related impacts.
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<br /> with mitigation.
<br /> The DSEIR also found four significant and unavoidable impacts related to transportation and
<br /> traffic. To summarize, the DSEIR found the JDEDZ will generate increased traffic, affecting the
<br /> levels of service for freeway ramps along 1-680 and surface streets in and around the project
<br /> area. It should be noted that proposed transportation mitigation improvements in the DSEIR
<br /> would result in acceptable levels of service (i.e., duration of delay in traveling through an
<br /> intersection), acceptable vehicle queue spillback (i.e., backed-up traffic potentially affecting
<br /> operation of an upstream intersection), and acceptable freeway ramp operations. However,
<br /> traffic impacts are characterized as significant and unavoidable because some of the needed
<br /> improvements require approval by Caltrans and thus are outside the immediate control of the
<br /> City. The graphics below (Figures 2 and 3) are intended to provide an overview of the required
<br /> transportation mitigation improvements resulting from the implementation of the JDEDZ. For
<br /> more detailed information, please refer to Chapter 4.D of the DSEIR (Exhibit D).
<br /> The DSEIR concluded that other impacts from the JDEDZ on aesthetics, air quality, biological
<br /> resources, cultural resources, geology and soils, greenhouse gas emissions, hazards and
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<br />process after receipt of a complete application.
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