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 CENTERLINE RE -ALIGNMENT (ALIGNMENT SHIFT) This proposed modification would shift the railroad alignment within the PE ROW. Table K lists the vibration levels calculated by HDR (June 2016) for the 30% design. Only the receptors included within the affected area (PE ROW) are listed. Table K: 30 Percent Design LPA Train Operation Vibration Levels NSA Rec. Land Use Cat. Transit Vehicle Speed (mph) Vibration Level (VdB) Vibration Impact 60% Design R1 2 45 58 None 1 R2 2 45 68 None R3 2 45 68 None 2 R4 2 45 68 None Operations R5 2 45 70 None 3 R6 2 45 71 None Cat. R7 2 45 63 None R8 3 45 66 None 4 R9 3 45 59 None 5 R11 3 45 63 None 6 R10 2 45 71 None 7 R12 2 45 71 None 8 R13 2 45 70 None 9 R15 2 45 66 None 10 R14 2 45 65 None Source: HDR, June 2016 Table L lists the distances from the modeled receivers to the 30% design alignment and the distances to the currently proposed 60% design alignment. Table L also lists the streetcar operation vibration levels associated with the 30% and 60% design streetcar alignments. Table L: Comparison of 30 Percent Design and 60 Percent Design Streetcar Vibration Levels 12 30% Design 60% Design Alignment Alignment Change in 60% Design Streetcar Streetcar Streetcar 30% Design Distance to Operations Operations Operations Land Use Distance to Track Track Vibration Level Vibration Level Vibration NSA Rec. Cat. Centerline (ft) Centerline (ft) (VdB) (VdB) Level (VdB) R1 2 89 89 58 58 0 1 R2 2 90 95 68 68 0 R3 2 92 91 68 68 0 2 R4 2 92 89 68 68 0 RS 2 55 49 70 71 +1 3 R6 2 49 49 71 71 0 R7 2 37 37 63 63 0 R8 3 92 85 66 67 +1 4 R9 3 401 370 59 59 0 12