Laserfiche WebLink
OCTA I Santa Ana/Garden Grove Fixed Guideway Project <br />FNNoise and Vibration Technical Addendum <br />Table B: Noise Sensitive Areas and Modeled Receptors Potentially Affected by Proposed <br />Minor Modifications/Engineering Refinement <br />NSA <br />Rec. <br />Description <br />8 <br />R13 <br />One (1) single family residential unit within Manufacturing/Industrial Services land use located between <br />Impact <br />(Prior to <br />Mitigation) <br />5th St and PE ROW, east of Hawley St. <br />2 <br />53 <br />NSA -9 includes single family residences and commercial/industrial uses north of the proposed O&M <br />9 <br />R15 <br />Facility between English St. and Fairlawn Ave. There are approximately 20 housing units within NSA -9. <br />56 <br />Moderate Impact <br />Currently, the proposed O&M site is used as the metal recycling facility and is a significant source of <br />R2 <br />2 <br />noise. <br />10 <br />R14 <br />Four (4) single family residential units located south of 4th SUPE ROW. Welding facility is located at the <br />N/A <br />52 <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 />The proposed minor modifications described in Table A could affect the noise levels previously <br />predicted and documented in the June 2016 Noise and Vibration memorandum. A noise <br />analysis was conducted that provides a comparison of the noise findings associated with the <br />30% design and with the 60% design. The following presents the results of this analysis. <br />Approved LPA Train Operation Noise Levels <br />Table C lists the noise levels calculated by HDR (June 2016) for the 30% design. Only the <br />receptors included within the potentially affected area associated with the proposed project <br />modifications (PE ROW) are listed. <br />Table C: 30 Percent Design 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 />Predicted Project Only Noise Level <br />Ldn or Lday (d BA) <br />Streetcar Audible <br />Ops Warning Crossing O&M <br />Overall <br />Project <br />Noise <br />Impact <br />(Prior to <br />Mitigation) <br />R1 <br />2 <br />53 <br />56 <br />N/A <br />N/A <br />N/A <br />56 <br />Moderate Impact <br />1 <br />R2 <br />2 <br />52 <br />52 <br />N/A <br />N/A <br />N/A <br />52 <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 />2 <br />R4 <br />2 <br />50 <br />52 <br />N/A <br />N/A <br />N/A <br />52 <br />No Impact <br />R5 <br />2 <br />51 <br />54 <br />N/A <br />N/A <br />N/A <br />54 <br />Moderate Impact <br />3 <br />R6 <br />2 <br />52 <br />59 <br />N/A <br />N/A <br />N/A <br />59 <br />Moderate Impact <br />R7 <br />2 <br />50 <br />64 <br />N/A <br />N/A <br />N/A <br />64 <br />Severe Impact <br />R8 <br />3 <br />52 <br />53 <br />65 <br />50 <br />N/A <br />65 <br />Moderate Impact <br />4 <br />R9 <br />3 <br />52 <br />50 <br />63 <br />54 <br />N/A <br />64 <br />Moderate Impact <br />5 <br />R11 <br />3 <br />46 <br />50 <br />58 <br />43 <br />N/A <br />59 <br />Moderate Impact <br />6 <br />R10 <br />2 <br />53 <br />59 <br />70 <br />51 <br />N/A <br />70 <br />Severe Impact <br />7 <br />R12 <br />2 <br />50 <br />61 <br />75 <br />49 <br />N/A <br />75 <br />Severe Impact <br />8 <br />R13 <br />2 <br />55 <br />58 <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 1 <br />66 <br />Moderate Impact <br />10 <br />R14 <br />2 <br />58 <br />1 55 <br />1 N/A <br />I N/A 1 <br />63 1 <br />64 <br />Severe Imp <br />Source: HDR, June 2016 <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 />Ll <br />