75B - PH - BRISTOL EIR FR CIVIC CENTER TO WASHINGTON(no exhibit 1)

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ENVIRONMENTAL IMPACTREPORTADDENDUM Bristol Street Widening Phase IIIA — Civic Center Drive to Washington Avenue This Addendum to the previously certified 1990 FEIS /EIR has been prepared because Project - related modifications to the Bristol Street alignment do not trigger the need for further environmental analysis in a Subsequent or Supplemental EIR under the requirements CEQA (refer to CEQA Guidelines Sections 15162 and 15163, respectively). 1.1 Purpose of an Addendum Under CEQA, when an EIR has been certified for a project, no Subsequent EIR may be required for that project unless the lead agency determines, based upon substantial evidence, that one or more specified circumstances has occurred. Only if one or more of the following circumstances arises is a Subsequent EIR required, pursuant to CEQA Guidelines Section 15162: 1. (1) Substantial changes are proposed in the project which will require major revision of the previous EIR due to the involvement of new significant environmental effects or a substantial increase in the severity of previously identified significant effects; 2. (2) Substantial changes occur with respect to the circumstances under which the project is undertaken which will require major revision of the previous EIR due to the involvement of new significant environmental increase in the severity of previously identified significant effects; or 3. (3) New information of substantial importance, which was not known and could not have been known with the exercise of reasonable diligence at the time the previous EIR was certified as complete, shows any of the following: (A) The project will have one or more significant effects not discussed in the previous EIR; (B) Significant effects previously examined will be substantially more severe than shown in the previous EIR; (C) 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, but the project proponents decline to adopt the mitigation measure or alternative; or (D) Mitigation measures or alternatives which are considerably different from those analyzed in the previous EIR would substantially reduce one or more significant effects on the environment, but the project proponents decline to adopt the mitigation measure or alternative. (CEQA Guidelines Section 15162[a]) A Supplement to an EIR (or Supplemental EIR), which is narrower in scope than a Subsequent EIR, may be prepared if any of the above criteria apply, but "[o]nly minor changes or additions would be necessary to make the previous EIR adequately apply to the project in the changed situation" (CEQA Guidelines Section 15163[a][2]). In the absence of the need to prepare either a Subsequent or Supplemental EIR, an Addendum may be prepared. More specifically, CEQA Guidelines Section 15164 states: (a) The lead agency or a responsible agency shall prepare an addendum to a previously certified EIR if some changes or additions are necessary but none of the conditions described in Section 15162 calling for preparation of a subsequent EIR have occurred. (b) An addendum to an adopted negative declaration may be prepared if only minor technical changes or additions are necessary or none of the conditions described in Section 15162 calling for the preparation of a subsequent EIR or negative declaration have occurred. ANA 305 -011 (PER 02) CITY OF SANTA ANA (0 75B -14 PACE