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future beyond 2010. The Master Plan and MSIR require a full traffic impact analysis for each Specific Plan; and at this time, by the latest, additional traffic studies will be prepared for cumulative traffic impacts with an expanded time frame. An updated noise study for Neighborhood "F" was prepared using the updated traffic data in compliance with MEIR mitigation measure4.14-1. The noise study showed increased 60 and 65 db noise contours for Mascot Boulevard, De Anza Boulevard and Mountain House Boulevard. As a result, higher noise walls or greater setbacks than originally adopted are needed. Such new information was required by the MSIR to refine the general noise mitigation identified in the MEIR and previous SEIR. The proposed noise mitigation measures for Neighborhood "F"thereby fine tune previous mitigation measures and do not constitute new information of substantial importance requiring preparation of a supplemental or subsequent EIR. The initial study has not identified any mitigation measures or alternatives previously found not to be feasible would in fact be feasible, and would substantially reduce one or more significant effects of the project. Nor have any mitigation measures or alternatives which are considerably different from those analyzed in the previous MEIR been identified that would substantially reduce one or more significant effects on the environment. In summary, the new geological and updated traffic and noise information does not result in new significant effects not discussed in the MSIR. The traffic impacts identified in the updated traffic study are equivalent or lower in impact in 22 of 24 arterial road segments. While higher impacts were identified along two road segments, the general effects of cumulative development were discussed in the MSIR and the two road segments will be mitigated on a similar basis as other road segment mitigations. (See chapters 4.12 and 6 of the MSIR) Noise impacts of traffic were discussed in the EIR(see chapter 4.14 of the MSIR) which required additional noise studies for Specific Plans or Development Plans. The outcome of such noise studies with its recommendations for raised mitigation measures, is therefore within the mitigation of the EIR and not new impacts. The new geological information about the Great Valley Fault Zone does not result in new impacts for impacts resulting from seismic events were discussed in the MEIR and its mitigation measures are sufficient to mitigate the potential impacts of the fault. (See chapter 4.6 of the MEIR). A-9 Appendix A