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HARBOR BLVD. MIXED USE TRANSIT CORRIDOR PLAN FINAL FIR <br />CITY OF SANTA ANA <br />5. Environmental Analysis <br />NOISE <br />Long -Term Operation <br />Mobile- Source Noise <br />A significant cumulative noise impact would occur where cumulative noise increases by 5 dB or more, the <br />projects cumulative contribution is 1 dB or more, and the ambient noise levels exceed the 65 dBA CNEL <br />noise compatibility standard in the vicinity of existing noise - sensitive land uses. Cumulative noise impacts due <br />to traffic sources are a combination of noise levels in the area due to the proposed project along with all <br />other traffic growth projected during the Harbor Corridor Plan buildout. Cumulative increases in traffic noise <br />levels were estimated by comparing the 2035 With Project scenario to existing conditions. Table 5.9 -8 show <br />the projects noise increases from existing conditions for 2035 conditions, without and with implementation <br />of the project. As discussed previously, no segments would result in a significant noise increase. As a result, <br />project related traffic noise impacts would be less than significant. <br />Stationary- Source Noise <br />Unlike traffic noise, whose effects can extend well beyond the limits of the project site, stationary- source <br />noise (mechanical equipment, loading /unloading activities, etc.) would typically only impact noise - sensitive <br />receptors near the project site. Because there are no existing major stationary noise sources in the vicinity of <br />the project site, and project related stationary noise would be less than significant, cumulative noise impacts <br />due to stationary noise sources would also be less than significant. <br />5.9.7 Existing Regulations and Standard Conditions <br />■ City of Santa Ana Municipal Code, Article yq, Noise Control. <br />5.9.8 Level of Significance Before Mitigation <br />Upon implementation of regulatory requirements and standard conditions of approval, Impact 5.9 -1 would <br />be less than significant. <br />Without mitigation, the following impacts would be potentially significant <br />■ Impact 5.9 -2 Noise levels at proposed residential areas would be above the 45 dBA CNEL <br />interior noise standards. <br />■ Impact 5.9 -3 Noise from the operation of commercial /retail and office uses could cause the <br />noise level at the property line of any adjacent residential property to exceed the <br />City of Santa Ana noise standards or cause noise levels to increase above existing <br />ambient noise. <br />■ Impact 5.9 -4 Construction activities would generate high levels of ground borne vibration. <br />Page 5.9 -20 PlaceWorkr <br />