2017-046 - Approving Addendum Nos. 1 and 2

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Santa Ana/Garden Grove Fixed Guideway Project Addendum #2 Geoloay. Soils. and Seismicit The potential geology, soils, and seismicity impacts associated with the construction and operation of the Project were evaluated in the EIR. Since the certification of the EIR, there have been no changes to the geological, soils or seismic environment or changes to the characteristics of the proposed Project as evaluated in the EIR that would affect these resources. The EIR concluded that impacts related to geologic and seismic hazards were less than significant and that no mitigation measures are required. No additional geology, soils, and seismicity impact would occur and the conclusions regarding no significant impacts identified in the EIR remain accurate. Hazardous Materials The potential hazardous materials impacts associated with the construction and operation of the Project was evaluated in the EIR. Since the certification of the EIR, there have been no changes to the hazardous materials environment or changes to the characteristics of the proposed project as evaluated in the EIR that would affect hazardous materials. As previously identified in the EIR, the Project would require limited acquisition of property which could have the potential to contain hazardous materials. Three properties identified as potentially hazardous sites would be acquired as part of Operations & Maintenance (0&M) Facility Site B (which is the currently proposed location for the 0&M facility). As described in the EIR, a detailed Phase I Environmental Site Assessment would be required to ascertain if employees working at the 0&M Facility would be exposed to toxic levels of hazardous materials. The EIR recommended implementation of Mitigation Measure HAZ1 to reduce this potential impact to a level less than significant. Because the proposed design modifications do not involve a change with respect to the location of the proposed 0&M Facility Site B, the conclusions regarding hazardous materials would remain the same. The EIR indicates that operation of the streetcar along the Project alignment would not involve the use of hazardous materials. As stated previously, no change to streetcar maintenance activities is proposed as part of the design modifications, therefore, no new significant impact or the increase in the severity of a significant impact would result. The conclusions that the potential hazardous materials impact would be reduced to a level of less than significant with the implementation of Mitigation Measure HAZ1 as identified in the EIR remain accurate. Traffic and Parking The potential traffic and parking related impacts associated with the construction and operation of the Project were evaluated in the EIR. Since the certification of the EIR, there have been some changes to the transportation network within the Project area. Also, as described under "Description of Design Modifications," some of the design modifications were determined to have the potential to impact traffic, and further analysis was warranted. The potential traffic and parking impacts associated with the 30% design changes were addressed in Addendum #1. However, in order to evaluate the potential traffic impacts associated with the 60% operational design modification of adding Traffic Signal Priority to intersections at Santa Ana Boulevard/Main Street, Santa Ana Boulevard/Broadway, Santa Ana Boulevard/Bristol Street, 4th Street/Broadway and 4th Street/Main Street, an update to the previously - prepared Traffic Study Addendum v2, see Traffic Study Addendum v4 attached as Appendix C. The purpose of the analysis was to identify any additional changes to traffic impacts that were previously disclosed in the EIR and Addendum #1 that are due to the operational design modification with the advancement of engineering since the Project (and conceptual design) was approved in 2015 and further advanced to 30% design and 60% design. Traffic Signal Priority for the Streetcar. Table 3-7 of the Traffic Study Addendum v4 (see Appendix C) summarizes the delay and corresponding LOS for 2035 Streetcar Conditions, with and without the transit signal priority adjustments, and using Highway Capacity Manual (HCM) Methodology. As shown on Table 3-7, overall intersection delay would change with implementation of Traffic Signal Priority, with minor decreases in delay at some locations, and minor 91 Page 1170726.1