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

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5. Environmental Analysis NOISE estimated using the FHWA's TN I. The modeling of traffic noise levels is based err traffic speed, and the volumes, traffic types of vehicles traveling on area roads. when the CNEL is 65 dB or reater, a 3 dB increase is used as a significance threshold. A 3 dB chap a in noise levels i } g considered to b the minimurn change discernible to the human ear. Table 5.2-8 provides traffic conditions for the Fairhaven /Lincoln intersection open (two-way affic and closed. �o scenarios: ]� Table S. -8 Traffic Morse Mode tff errs loeaf Noise Change Location ADT dBA CNEL ADT dB l EL d A cNEL Linoin Avenue Fairhaven to Santa Clara 6,800 68.9 1,300 64.2 -4.7 Santa Clara to 1 7th 6,350 60.3 4,570 67.0 -1.4 anta Vara Avenue East of Lincoln 6,350 66.E 1 7,280 60.0 airhaven Avenue . East of Lincoln 61 800 66.7 3,010 .65.2. 171h: treet Between Lincoln and Grand Avenue L.700-J-77.7 36,360 77.6 -0.1 :...... North .Grand Avenue -Fairhaven to Santa Clara 24,800 76.2 26,050 76.0 0.7 Santa Clara to 17th 24,160 76.1 31 x610 7 7.3 1. Source: FHWA, Traffic Noise Model JNM), Version 2.5. Based on traffic volumes and speed limits from obtained the traffic analysis prepared by DMJM Harris (March 2008). Modeling is based on noise levels at 10 feet from the edge of the nearest traffic lane (excludes noise from train traffic). ' used on traffic volumes with the Fairhaven Avenue intersedon open. 2 Based on traffic volumes with the Fairhaven Avenue intersection closed. An increase or decrease in noise levels that is less than 3 dB is not discernible, Therefore, the only discernible difference in noise between the previous open and existing s i a reduction �n closed condition noise. The proposed project would continue the existing closed condition by modifying the Fairhaven /Lincoln intersection from two lanes to a permanently closed intersection with a cul -de -sac. This modification would remove the temporary barriers and permanently prohibit all traffic traveling northbound on Lincoln Avenue from Park Avenue to Fairhaven Avenue. This project would not change the existing closed condition of the Fairhaven/Lincoln intersection and therefore world not increase traffic noise. Vehicle traffic noise would be less than significant. IMPACT 5.2-2: CONSTRUCTION ACTIVITIES WOULD NOT RESULT IN SIGNIFICANT TEMPORARY NOISE IMPACTS, [THRESHOLD 111 -1 AND X-41 ImPact Analysis: Con struction- related noise would result from the use of eguiprnent and tools, The d ree to which noise - sensitive receptors are affected b construction activities depends on their 9 � proximity. The transport of workers and equipment to the construction site would incrementally increase noise levels along site access roadways. Even though there would be a relatively high single-event noise exposure potential with passing trucks a maximum noise level of dBA at 5 feet) the e p r expected nurr�ber �f workers and trucks is small for each site relative to the background traffic. The truck trips would be spread throughout FairbavenlLincoln and Santa ClaralLincoln Intersection Modificationj City of ant • Page 5,2 - leme o the Santa Ana SecondNfain Track Project EIR Resolution No. 2009 -034 Page 75 of 130