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 OPERATIONAL IMPROVEMENTS The additional modifications from 60% design would result in the following changes to the Project's operations from 30% design: • Reducing the maximum speed within the PE ROW from 45 miles per hour (mph) to 44 mph • Implementation of Traffic Signal Priority (TSP) at all traffic signals along the route including at Main Street, Broadway, and Bristol Street Supplemental Noise and Vibration Analysis The following describes the sensitive receptor locations analyzed in the context of this analysis, as compared to the previously approved analysis with respect to potential changes to noise and vibration at these locations. Noise Sensitive Areas and Receptor Locations In the prior noise and vibration analyses (2015 EA/EIR and June 2016 Supplement), noise sensitive areas (or NSAs) were identified within the Study Area that could potentially be impacted from the Build Alternatives. The NSA's were defined by identifying noise sensitive land uses - residential, educational, recreation, churches (places of worship), etc. - within the defined screening distance of the project. Within each of these NSAs, URS modeled between one and nine specific receptor locations (e.g., R1, R2). Of the 21 NSAs identified by URS, only 10 are located within the area potentially affected by the currently proposed minor modifications. Table B lists each of the 10 NSA's and the corresponding receptors (e.g., R1, R2) within each NSA, and provides a description of the receptors included within each of the 10 NSAs. Figure 5 from the February 2012 Noise and Vibration Technical Report (URS Corporation), showing the locations of the NSAs and modeled receptors, is provided in Attachment A. Table B: Noise Sensitive Areas and Modeled Receptors Potentially Affected by Proposed Minor Modifications/Engineering Refinement NSA Rec. Description 1 R1 Single family residential land use located south of PE ROW at western end of the proposed alignment. R2 There are 14 housing units within NSA -1. R3 Mobile home park located north of Wllowick Municipal Golf Course and south of PE ROW. There are 2 24 mobile homes within the screening distance. Note that a 6 -foot concrete wall was observed between R4 PE ROW and the mobile home park. R5 3 Mobile home park and single family residential land use located north or PE ROW and west of Santa R6 Ana River. There are 68 mobile homes and 1 single family residential unit within NSA -3. R7 4 R8 Spurgeon Intermediate School athletic fields bounded by Fairview St., PE ROW, Santa Ana River, and Rg 5th St. There are no structures within 350 feet from the proposed alignment. 5 R11 Small Wonders Children's Center, Templo Calvario Assembly of God, and Olive Crest Academy located south of PE ROW and east of Fairview St. 6 R10 Single family residential land uses located north of PE ROW, east of Fairview St at the end of 7th St. There are 7 housing units within NSA -6. 7 R12 Single family residential land uses located north of PE ROW, east of Fairview St at the end of 6th St. There are 4 housing units within NSA -7. 5