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OCTA I Santa Ana/Garden Grove Fixed Guideway Project <br />FNNoise and Vibration Technical Analysis Re-evaluation in Support of Minor Design Modifications <br />Streetcar Vibration Analysis <br />The proposed project modifications would affect the vibration level results as presented in the <br />February 2012 Noise and Vibration Technical Report prepared by the URS Corporation. <br />Beginning at Harbor Boulevard and ending at Raitt Street the proposed modifications would <br />implement the following changes to the previously approved LPA. <br />Increase in Speed <br />The proposed modification would increase the average train speed within the PE ROW from <br />35 to 45 mph. However, URS calculated the original vibration levels using a conservative speed <br />of 40 mph. Therefore, this analysis evaluates the change in vibration levels associated with <br />increasing the average speed from 40 to 45 mph. <br />Alignment Shift <br />The proposed modification would shift the railroad alignment within the PE ROW to the north. <br />The original and proposed alignments are shown in Attachment B. <br />Orginally-Approved LPA Vibration Levels <br />Table J lists the noise levels calculated by URS (February 2012) for the approved LPA. Only the <br />receptors included within the affected area (PE ROW) are listed. <br />Table J: Originally -Approved LPA Train Operation Vibration Levels <br />NSA <br />Rec. <br />Land Use <br />Cat. <br />Transit Vehicle Speed <br />(mph) <br />Vibration Level (VdB) <br />Vibration Impact <br />R1 <br />2 <br />40 <br />68 <br />None <br />1 <br />R2 <br />2 <br />40 <br />67 <br />None <br />R3 <br />2 <br />40 <br />67 <br />None <br />2 <br />R4 <br />2 <br />40 <br />67 <br />None <br />R5 <br />2 <br />40 <br />68 <br />None <br />3 <br />R6 <br />2 <br />40 <br />70 <br />None <br />R7 <br />2 <br />40 <br />70 <br />None <br />R8 <br />3 <br />40 <br />66 <br />None <br />4 <br />R9 <br />3 <br />40 <br />58 <br />None <br />5 <br />R11 <br />3 <br />40 <br />62 <br />None <br />R10 <br />2 <br />40 <br />70 <br />None <br />7 <br />R12 <br />2 <br />40 <br />70 <br />None <br />8 <br />r106 <br />R13 <br />2 <br />40 <br />69 <br />None <br />9 <br />R15 <br />2 <br />40 <br />65 <br />None <br />R14 <br />2 <br />40 <br />64 <br />None <br />Source: URS, February 2012 <br />10 <br />