2017-046 - Approving Addendum Nos. 1 and 2

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OCTA I Santa Ana/Garden Grove Fixed Guideway Project FNNoise and Vibration Technical Addendum Memo Date: Tuesday, February 21, 2017 Project: Santa Ana/Garden Grove Fixed Guideway Project To: Mary Shavalier/Program Manager, OCTA From: Keith Lay, Senior Air Quality and Noise Specialist Subject: Noise and Vibration Technical Addendum in Support of Engineering Refinements This noise and vibration re-evaluation and Addendum to the Santa Ana/Garden Grove Fixed Guideway Project (Project) has been prepared to address additional design modifications to the Project resulting from engineering refinements in advancing Preliminary Engineering (30%) design to 60% design. This document is supplemental to a previous Supplemental Noise and Vibration Technical Memorandum, which was completed to study design modifications resulting from 30% design in June 2016. This memorandum presents the results of the supplemental noise and vibration technical analysis of the proposed minor modifications. The results of this analysis are based on an assessment and review of the currently proposed minor modifications/engineering refinement as compared to the 30% design was the basis of evaluation in the June 2016 memorandum. The methodology of the FTA Noise and Vibration Manual (May 2006) was followed for this supplemental analysis. Project Background The Project is a proposed as an approximately 4 -route mile modern streetcar line that will connect the Santa Ana Regional Transportation Center (SARTC) to Downtown Santa Ana and a new transportation hub located near the intersection of Harbor Boulevard and Westminster Avenue in Garden Grove. Construction and operation of the Project (the adopted Locally Preferred Alternative, or "LPA") was approved by the Federal Transit Administration (FTA) in a Finding of No Significant Impact (FONSI), dated March 10, 2015 based on the findings of the Revised Environmental Assessment (EA) (January 2015), pursuant to the National Environmental Policy Act (NEPA). The City of Santa Ana certified the Environmental Impact Report (EIR) (State Clearinghouse #2010051060) in January 2015, which was subsequently adopted by OCTA. OCTA is a CEQA "Responsible Agency" as defined by CEQA Guideline 15381. Pursuant to CEQA Guideline 15381, "Responsible Agency" means "a public agency which proposes to carry out or approve a project, for which a Lead Agency is preparing or has prepared an EIR or Negative Declaration." The approved Project was based on a conceptual level of engineering. Subsequent to Project approval in 2015, OCTA has taken the lead in advancing the design and implementation of the Project. As part of this engineering design phase, OCTA is proposing some modifications to the Project as it was defined and analyzed in the EIR. The modifications comprise of physical and 1