2009-034 (2) - Final Supplemental Environmental Impact Report for Fairhaven/Lincoln

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S. Environmental Analysis 5.2 NOISE This section of the Draft SEIR discusses the fundamentals of sound; examines federal, state, and local noise guidelines, policies, and standards; reviews noise levels at existing receptor locations; evaluates potential noise impacts associated with the project; and compares impacts to those analysed in the Santa Arta Second Main Track EIR (2092). This evaluation uses procedures and ,methodologies as specified by California Department of Transportation caltran , the Federal Transit Administration (FTA) , and the Federal Highway Administration FHWA . The analysis in this section is partially based on the fol low! ng documents: • Traffic lm act Studer, Santa Aria Second Naar Track, Updated Draft Report, DMJM Harris, 2098, March. in Santa Aria Second Main Track Project Environmental Impact Report. State Clearinghouse Igo. 2900091 065. Prepared for Southern California Regional Rail Authorr`ty SCRRA . Prepared by Myra L. Frank and Associates, Inc., 2992, February. Norse modeling data sheets for this analysis are included as Appendix D. 5.2.1 Impacts Identified in the Santa Ana Second Main Track EIR (2002) The 2992 EIR analyzed all environmental checklist items in the CE QA Guidelines related to construction and operational noise impacts. The project analyzed in the 2992 EIR has been completely constructed. Revisions to the project do not result in impacts related to train activity on the main line tracts, therefore, train noise and vibration impacts identified in the 2802 EIR are not included in this Draft SEIR. The 2092 EIR found that construction activities would result in occasional and sporadic increases in noise levels, Co nstruction noise was described as being temporary and limited to the daytime hours of 7 :08 AM to 8:08 PK with the exception of track realignment activities, and no significant impacts were identified. Because the original project did not result in an increase in vehicular traffic, an increase In noise solely from project- related vehicular traffic was not evaluated in the 2902 EIR. 5. 2.2 Environmental Setting Noise Terminology The following are definitions of terminology used in this section: • Noise. Sound that is loud, unpleasant, unexpected, or otherwise undesirable, • Decibel (dB). A unitless ,measure of sound on a logarithmic scale. • A- Weighted Decibel BA . An overall frequency - weighted sound level in decibels that approximates the frequency that humans can hear. • Sound Level Equivalent (L�q ). The mean of the noise level averaged over the measurement period, regarded as an average level, • Day-Night Level (LJ. The energy average of the A- weighted sound levels occurring during a 24-hour period, with 19 dB added to the sound levels occurring during the period from 18 PM to 7 AM. FairhavenlLincoln and Santa ClaralLincoln Ir ters c io n 10 i� cations City of ra a Ana a Page 5.2 -1 eo Supplement to the Santa Aria Second Main Track Project EIR Resolution No. 2009 -034 Page 67 of 130