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ENVIRONMENTAL IMPACT REPORTADDENDUM Bristol Street Widening Phase IIIB — Washington Avenue to 1716 Street 1.0 INTRODUCTION This Addendum has been prepared in accordance with the California Environmental Quality Act (CEQA), as amended, to evaluate the potential environmental impacts of the proposed changes to the widening of Bristol Street, from Warner Avenue to Memory Lane as proposed in the Project Final Environmental Impact Statement / Environmental Impact Report (FEIS/EIR) approved in 1990 (FHWA-CA- EIS- 89 -01- F; SCH No. 87071509), This Addendum focuses on the segment of Bristol Street between Washington Avenue and 176' Street (Phase IIIB, or Project) and is limited to the proposed improvements to this segment. This Addendum provides an assessment of potential environmental impacts associated with minor design modifications and the issue of climate change which was not addressed in the previously prepared and certified FEIS/EIR. Design modifications to the Project, since approval of the 1990 FEIS/EIR, that are addressed in this Addendum include the following: • The proposed Project eliminates the dedicated eastbound right -turn lane and proposes a shared right -turn lane in its place at the intersection of Bristol Street and 17`x' Street. • The 1990 FEIS /EIR, using decommissioned noise methodology, recommended noise barriers (soundwalls) at all easterly parcel boundaries currently fronting the east side of Bristol Street between Civic Center Drive and 17t1i Street. However, using current noise modeling methodology (Noise Study Report, URS Corporation 2012c), noise abatement in the form of noise barriers is not required for the Phase IIIB Project. • For purposes of aesthetic treatment and enhancement, the proposed Project would install an approximately 8 -foot high block wall at approximately the same location where the soundwall was previously recommended (as addressed in the 1990 FEIS /EIR). Additionally, the topic of greenhouse gas (GHG) emissions was not addressed in the previously approved 1990 FEIS /EIR as this topic was not a subject matter that required evaluation pursuant to CEQA at that time. As such, this Addendum analyzes the effects of GHG emissions associated with construction and operation of the proposed Project. 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 FIR 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 ANA I t1-334 (PER- 02 -01) CITY OF SANTA ANA (11/25/2013 REV2) 132897 CM PAGE I 55C -16