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<br />saws, excavators, rubber-tired dozers, tractors, loaders, backhoes, graders, and a crane, but would not include pile
<br />driving. At 50 feet from the construction noise source, the noise levels from these pieces of equipment range from 80
<br />dB to 88 dB and would be expected to meet the Municipal Code criterion of 110 dB or below at the nearest residences.
<br />To help reduce construction noise on neighboring properties (which are already less than significant), the following
<br />noise control measures would be required as part of the project’s conditions of approval which would further reduce
<br />the less than significant noise impact:
<br />1. Construction activities will be limited to durations in accordance with Municipal Code Section 24.32. If Saturday
<br />construction is permitted and occurrs near the northern portion of the site, it must be ensured that noise levels are
<br />quieter than ambient levels, per Section 24.32 of the Municipal Code.
<br />2. Construction activity should be conducted to minimize the noise impact at adjacent off-site receivers.
<br />3. Equip all internal combustion engine-driven equipment with intake and exhaust mufflers that are in good condition
<br />and appropriate for the equipment.
<br />4. Unnecessary idling of internal combustion engines shall be prohibited.
<br />5. Locate stationary noise-generating equipment, such as air compressors or portable power generators, as far as
<br />possible from sensitive receptors such as residences.
<br />6. Utilize “quiet” air compressors and other quiet stationary equipment where the technology exists.
<br />7. Construction staging areas, including truck loading and unloading operations, shall be scheduled and located so
<br />they minimize the noise impact on adjacent offsite residences.
<br />8. Control noise from construction workers' radios to a point where they are not audible at existing residences
<br />bordering the project site.
<br />9. Designate a "disturbance coordinator" who would be responsible for responding to any complaints about
<br />construction noise. The disturbance coordinator will determine the cause of the noise complaint (e.g., beginning work
<br />too early, bad muffler) and will require that reasonable measures be implemented to correct the problem. A telephone
<br />number for the disturbance coordinator shall be conspicuously posted at the construction site.
<br />Operational Noise (Salter, p. 8): Project component operational noise would occur primarily as a result of rooftop
<br />mechanical equipment. The project component would include the following mechanical equipment: air handling units
<br />(AHUs), a domestic hot water system (DHW), a chiller, and a pump in an enclosed penthouse, and an external
<br />generator, cooling towers, and air source heat pumps (ASHPs) behind a rooftop screen (Plan Sheet A7, 11/9/23). As
<br />indicated in the project component plans (Plan Sheets A10.1 and A10.2, 11/9/23), rooftop equipment would be
<br />screened by a mechanical screen/penthouse extending 10 feet above the top of the roof, subject to final design review
<br />and approval by the City, which would need to be completed prior to issuance of any building permit. The rooftop
<br />mechanical equipment would be similar to that of the surrounding commercial buildings. Given the screening, existing
<br />urban noise environment, and distance from the surrounding receptors, the proposed project component would not be
<br />a substantial source of new permanent noise. According to the Salter noise study (Salter, p. 8), the planned locations
<br />of this equipment would be finalized during the design phase, with equipment selected and located to meet the City
<br />Code criteria, which limits noise levels to 55 dB(A) at any point along the property line. If needed, noise reduction
<br />measures could consist of equipment selection, shielding with barriers, and/or parapet walls, equipment enclosures,
<br />etc.
<br />Project-Generated Traffic Noise (Salter, pp. 7-8): In general, doubling traffic volumes can increase transportation
<br />noise in the project vicinity by approximately three dBA CNEL or more; this would be considered a significant impact.
<br />The Salter noise study reviewed existing and “with project” cumulative peak hour intersection traffic volume data to
<br />assess increases in project-generated traffic noise, and concluded the following:
<br /> If Broadway remains closed to vehicle traffic adjacent to the site (Main Street to Jefferson Avenue) –
<br />o Traffic noise along Main Street, Broadway, Walnut Street and Spring Street would not be expected to
<br />increase significantly.
<br />o Estimated traffic noise along Marshall Street adjacent to and just east of the project component site would be
<br />expected to increase by approximately 1 dB above the measured levels, which would be considered less than
<br />significant.
<br /> If this portion of Broadway is reopened to vehicular traffic –
<br />ATTY/RESO.0074/CC RESO 847 WOODSIDE (CEQA) - EXHIBIT 1 - CEQA CONSISTENCY CHECKLIST
<br />REV: 10-23-24 VR
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