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Hana Japan Restaurant Project Initial Study/Mitigated Negative Declaration 62 May 2025 Table 6 Construction Equipment Noise Type of Equipment Maximum Level, dB at 50 feet Auger Rill Rig 84 Backhoe 78 Compactor 83 Compressor (air) 78 Concrete Saw 90 Dozer 82 Dump Truck 76 Excavator 81 Generator 81 Jackhammer 89 Pneumatic Tools 85 Source: Federal Highway Administration, Roadway Construction Noise Model User’s Guide, January 2006. As one increases the distance between equipment, or increases separation of areas with simultaneous construction activity, dispersion and distance attenuation reduce the effects of combining separate noise sources. The noise levels from a source decrease at a rate of approximately 6 dB per every doubling of distance from the noise source. For the project site, the closest receptor for construction noise would be the existing single-family residence located approximately 180 feet to the south of the site. The proposed off-site emergency vehicle turnaround is located closer to the single-family residence; however, the turnaround would connect to existing fire road and driveway, which are located approximately 140 feet from the residence. Because the distance between the proposed construction area and the nearest receptors is significantly greater than 50 feet, pursuant to the maximum construction equipment noise levels established in Table 9 above, the closest receptor would be exposed to maximum noise levels below the allowable construction noise limit of 86 dBA set forth in Section 9.04.100 of the City’s Municipal Code. Therefore, construction noise associated with the proposed project would be less than significant. Operational Noise Operations associated with the proposed development would generate noise primarily associated with vehicle traffic along the local roadways, as well as vehicle noise within the on-site parking lot associated with the proposed restaurant. The City of Pleasanton does not have a significance threshold for increases in non- transportation noise sources. In the absence of a specific threshold, the FICON criteria established in Table 8 are used to assess increases in ambient noise environment. As such, where existing traffic noise levels are greater than 65 dB Ldn, a 1.5 dB Ldn increase in roadway noise levels would be considered significant. As shown in Figure 11-1, City-Wide Noise Monitoring Sites, of the City’s General Plan, the project site is located in a similar position to Monitoring Site 31 (i.e., similar distances from a major interstate). As listed in Table 11-2 of the General Plan, Monitoring Site 31 recorded a noise level of 65 to 68 dBA Ldn. In addition, Table 11-3 notes that the segment of Dublin Canyon Road located west of Foothill Road, on which the project site is located, experiences 910 vehicle trips at the PM peak hour. Due to the nature and relatively small size of the proposed project, substantial daily vehicle trips sufficient to increase traffic