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Environmental Checklist Noise <br /> Initial Study – Mitigated Negative Declaration 67 <br />use. As shown in Table 16 in Section 16, Transportation, assuming the entire building would be <br />occupied by warehouse uses, the traffic analysis found the project would generate an estimated net <br />of 18 weekday A.M. peak hour trips (13 inbound, five outbound) and a net of 23 weekday P.M. peak <br />hour trips (four inbound, 19 outbound). As shown in Table 17, assuming the entire building would <br />be occupied by advanced manufacturing uses, the project would generate an estimated net of 55 <br />weekday A.M. peak hour trips (50 inbound, 5 outbound) and a net of 71 weekday P.M. peak hour <br />trips (6 inbound, 65 outbound). Project-generated trips would be distributed among area roadways <br />including Alvarado Street and Aladdin Avenue. <br />Modeling of traffic noise indicates that, in general, a 10 percent increase in traffic volume would <br />raise traffic noise by approximately 0.4 dBA, a 20 percent increase would raise traffic noise by about <br />0.8 dBA, a 30 percent increase would result in an approximately 1.1 dBA increase in traffic noise, <br />and a 40 percent increase would increase traffic noise by about 1.5 dBA. While the City has not <br />adopted standards for an increase in traffic noise due to a project, this screening analysis evaluates <br />the project’s effect on traffic noise based on Federal Transit Administration thresholds (Table 10). <br />Cumulative traffic noise was evaluated using a similar screening methodology based on projected <br />cumulative traffic volumes for the year 2035, provided by the Transportation Impact Study Report. <br />This cumulative forecast was developed using growth rates for weekday peak hour traffic volumes <br />derived from the San Leandro General Plan and recent studies near project site (TJKM 2017: <br />Appendix D). <br />Impact Analysis <br />a. Would the project result in exposure of persons to or generation of noise levels in excess of <br />standards established in the local general plan or noise ordinance, or applicable standards of <br />other agencies? <br />c. Would the project result in a substantial permanent increase in ambient noise levels above <br />levels existing without the project? <br />The project would involve redeveloping the project site use from warehouses to office, warehouse, <br />and/or advanced manufacturing. Noise associated with operation of the project may be periodically <br />audible at adjacent uses. Noise events that are typical of advanced manufacturing buildings include <br />automobile traffic and conversations, as well as noise typical of parking lots such as car alarms and <br />car doors slamming. On-site operations are expected to also involve noise associated with rooftop <br />ventilation, heating systems, truck deliveries, and trash hauling. These noise sources and levels <br />would be similar to surrounding industrial development and would not result in a substantially <br />increase compared to the existing warehouse uses onsite. Although the use of the project site <br />would change, the operational noise levels would be similar. <br />Permanent project-related changes in noise would be primarily due to increases in traffic volumes <br />on nearby street segments and intersections. For traffic-related noise, impacts would be significant <br />if project-generated traffic results in exposure of sensitive receptors to unacceptable noise levels. <br />Table 8 shows the significance thresholds for increases in traffic related noise levels caused by the <br />project. <br />364