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0� OCTA I Santa Ana/Garden Grove Fixed Guideway Project <br />Noise and Vibration Technical Analysis Re-evaluation in Support of Minor Design Modifications <br />Table A: Noise Sensitive Areas and Modeled Receptors Potentially Affected by Proposed <br />Minor Modifications/Engineering Refinement <br />NSA <br />Rec. <br />Description <br />10 <br />R14 <br />Four (4) single family residential units located south of 4th SUPE ROW. Welding facility is located at the <br />Overall <br />Project <br />Noise <br />Impact <br />(Prior to <br />Mitigation) <br />corner of 4th St. and Daisy Ave. The metal recycling facility is across from PE ROW. <br />Source: URS, February 2012 (Appendix J of the 2015 EA/EIR) <br />Streetcar Noise Analysis <br />As stated above, proposed minor modifications could affect the noise levels previously predicted <br />and documented in the February 2012 Noise and Vibration Technical Report (URS 2012) at <br />certain locations. A noise analysis was conducted that provides a comparison of the noise <br />findings associated with the originally -approved LPA as compared to the proposed project <br />modifications. The following presents the results of this analysis. <br />Approved LPA Train Operation Noise Levels <br />Table B lists the noise levels calculated by URS (February 2012) for the originally -approved <br />LPA alignment and as presented in Appendix J of the 2015 EA/EIR. Only the receptors included <br />within the potentially affected area associated with the proposed project modifications (PE <br />ROW) are listed. <br />Table B: Originally -Approved LPA Train Operation Noise Levels <br />NSA <br />Rec. <br />Land <br />Use <br />Cat. <br />Existing <br />Noise <br />Level <br />(d BA) <br />Streetcar <br />Ops <br />Predicted Project Only Noise Level <br />Ldn or Lday (d BA) <br />Warning <br />Horn Crossing O&M <br />Overall <br />Project <br />Noise <br />Impact <br />(Prior to <br />Mitigation) <br />R1 <br />2 <br />53 <br />51 <br />N/A <br />N/A <br />N/A <br />51 <br />No Impact <br />1 <br />R2 <br />2 <br />52 <br />50 <br />N/A <br />N/A <br />N/A <br />50 <br />No Impact <br />R3 <br />2 <br />51 <br />50 <br />N/A <br />N/A <br />N/A <br />50 <br />No Impact <br />2 <br />R4 <br />2 <br />50 <br />50 <br />N/A <br />N/A <br />N/A <br />50 <br />No Impact <br />R5 <br />2 <br />51 <br />51 <br />N/A <br />N/A <br />N/A <br />51 <br />No Impact <br />3 <br />R6 <br />2 <br />52 <br />56 <br />N/A <br />N/A <br />N/A <br />56 <br />Moderate Impact <br />R7 <br />2 <br />50 <br />57 <br />N/A <br />N/A <br />N/A <br />57 <br />Moderate Impact <br />R8 <br />3 <br />52 <br />51 <br />65 <br />50 <br />N/A <br />66 <br />Severe Impact <br />4 <br />R9 <br />3 <br />52 <br />48 <br />63 <br />54 <br />N/A <br />64 <br />Moderate Impact <br />5 <br />R11 <br />3 <br />46 <br />49 <br />59 <br />43 <br />N/A <br />59 <br />Moderate Impact <br />6 <br />R10 <br />2 <br />53 <br />56 <br />69 <br />51 <br />N/A <br />69 <br />Severe Impact <br />7 <br />R12 <br />2 <br />50 <br />57 <br />73 <br />49 <br />N/A <br />73 <br />Severe Impact <br />8 <br />R13 <br />2 <br />55 <br />56 <br />69 <br />44 <br />N/A <br />69 <br />Severe Impact <br />9 <br />R15 <br />2 <br />67 <br />1 N/A <br />I N/A <br />I N/A 1 <br />66 <br />1 66 <br />Moderate Impact <br />10 <br />R14 <br />2 <br />58 <br />1 53 <br />1 N/A <br />I N/A 1 <br />63 <br />1 63 <br />Severe Impact <br />Source: URS, February 2012 (as provided in Appendix J of the 2015 EA/EIR) <br />Notes: Land Use Category 2: Residences and buildings where people normally sleep. <br />Land Use Category 3: Institutional land uses with primarily daytime and evening use. <br />No Impact: A proposed project is considered to have no noise impact since, on average, the introduction of <br />the project will result in an insignificant increase in the number of people highly annoyed by the new noise. <br />Moderate Impact: The change in the cumulative noise level is noticeable to most people, but may not be <br />El <br />