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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 E: Comparison of Originally -Approved LPA and Modified Project Train Operation <br />Noise Levels (Unmitigated) <br />Source: URS (February 2012) and HDR (June 2016). <br />Noise Attenuation Design Features — Streetcar Operation <br />Table F lists the receptor locations within the affected area that are predicted to experience <br />severe noise impacts based on the proposed Modified Project, but without consideration of the <br />recommended noise attenuation measures as part of final design. As discussed in Section 6.1 <br />of the original noise and vibration technical report (URS 2012), FTA guidance states that noise <br />attenuation measures must be considered for identified severe impacts. These measures can <br />be included as project design features for the proposed modifications/engineering refinements. <br />Table F: Summary of Noise Impacts for Modified Project (Without Recommended Noise <br />Attenuation Measures) <br />NSA <br />Rec. <br />Land <br />Use <br />Cat. <br />Existing <br />Noise <br />Level <br />(d BA) <br />Predicted Project Only Noise Level <br />Predicted Project Only Noise Level <br />Ldn or Lday (d BA) <br />Impact <br />(without <br />attenuation <br />measures) <br />Overall <br />Streetcar Warning Project <br />Ops Horn Crossing O&M Noise <br />3 <br />Existing <br />Ldn or Lday (d BA) <br />50 <br />Revised <br />N/A N/A N/A <br />64 <br />Severe Impact <br />6 <br />Overall <br />2 <br />53 <br />Land <br />Noise <br />Approved <br />Project <br />7 <br />R12 <br />Use <br />Level <br />Streetcar <br />Warning <br />73 <br />Severe Impact <br />Project <br />Project Impact <br />Impact <br />NSA <br />Rec. <br />Cat. <br />(d BA) <br />Ops <br />Horn <br />Crossing <br />O&M <br />Noise <br />(no mitigation) <br />(no mitigation) <br />R2 <br />2 <br />52 <br />52 <br />N/A <br />N/A <br />N/A <br />52 <br />No Impact <br />No Impact <br />R3 <br />2 <br />51 <br />52 <br />N/A <br />N/A <br />N/A <br />52 <br />No Impact <br />No Impact <br />2 <br />R4 <br />1 2 <br />1 50 <br />52 <br />N/A <br />N/A <br />N/A <br />52 <br />No Impact <br />No Impact <br />R5 <br />2 <br />51 <br />54 <br />N/A <br />N/A <br />N/A <br />54 <br />No Impact <br />Moderate <br />I mpact <br />3 <br />R6 <br />R6 <br />2 <br />52 <br />59 <br />N/A <br />N/A <br />N/A <br />59 <br />Moderate Impact <br />Moderate <br />R7 <br />2 <br />50 <br />64 <br />N/A <br />N/A <br />N/A <br />64 <br />Moderate Impact <br />Severe Impact <br />R8 <br />3 <br />52 <br />53 <br />65 <br />50 <br />N/A <br />65 <br />Severe Impact <br />Moderate <br />1 mpact <br />4 <br />R9 <br />3 <br />52 <br />50 <br />63 <br />54 <br />N/A <br />64 <br />Moderate Impact <br />Moderate <br />I mpact <br />5 <br />R11 <br />3 <br />46 <br />51 <br />59 <br />43 <br />N/A <br />60 <br />Moderate Impact <br />Moderate <br />I mpact <br />6 <br />R10 <br />2 <br />53 <br />58 <br />69 <br />51 <br />N/A <br />69 <br />Severe lmpact <br />Severe Impact <br />7 <br />R12 <br />2 <br />50 <br />59 <br />73 <br />49 <br />N/A <br />73 <br />Severe lmpact <br />Severe Impact <br />8 <br />R13 <br />2 <br />55 <br />58 <br />69 <br />44 <br />N/A <br />69 <br />Severe lmpact <br />Severe Impact <br />9 <br />R15 <br />2 <br />67 <br />N/A <br />N/A <br />N/A <br />66 <br />66 <br />Moderate Impact <br />Moderate <br />I mpact <br />10 <br />R14 <br />2 <br />58 <br />55 <br />N/A <br />N/A <br />63 <br />64 <br />Severe lmpact <br />Severe Impact <br />Source: URS (February 2012) and HDR (June 2016). <br />Noise Attenuation Design Features — Streetcar Operation <br />Table F lists the receptor locations within the affected area that are predicted to experience <br />severe noise impacts based on the proposed Modified Project, but without consideration of the <br />recommended noise attenuation measures as part of final design. As discussed in Section 6.1 <br />of the original noise and vibration technical report (URS 2012), FTA guidance states that noise <br />attenuation measures must be considered for identified severe impacts. These measures can <br />be included as project design features for the proposed modifications/engineering refinements. <br />Table F: Summary of Noise Impacts for Modified Project (Without Recommended Noise <br />Attenuation Measures) <br />NSA <br />Rec. <br />Land <br />Use <br />Cat. <br />Existing <br />Noise <br />Level <br />(d BA) <br />Predicted Project Only Noise Level <br />Ldn or Lday (d BA) <br />Impact <br />(without <br />attenuation <br />measures) <br />Overall <br />Streetcar Warning Project <br />Ops Horn Crossing O&M Noise <br />3 <br />R7 <br />2 <br />50 <br />64 <br />N/A N/A N/A <br />64 <br />Severe Impact <br />6 <br />R10 <br />2 <br />53 <br />58 <br />69 51 N/A <br />69 <br />Severe Impact <br />7 <br />R12 <br />2 <br />50 <br />59 <br />73 49 N/A <br />73 <br />Severe Impact <br />7 <br />