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874 Lewelling Blvd. <br />Noise Study <br />9 July 2018 <br />Page 2 of 8 <br /> <br /> <br /> <br />attenuating “Z” ducts on exterior elevations for each residential unit or a forced air mechanical <br />ventilation system. Refer to Appendix A for definitions of common acoustical terms. <br />REGULATORY SETTING <br />The San Leandro General Plan contains the following noise compatibility requirement for <br />residential developments (Chapter 7, section E): <br /> <br />This noise study and subsequent analysis and recommendations for exterior -to-interior noise <br />control are based on the 45 dBA CNEL indoor requirement stated above and the following <br />additional requirement outlined in the 2010 California Building Code (Title 24, Part 2): <br />SECTION 1207.12 COMPLIANCE: ...If interior allowable noise levels are met by <br />requiring that windows be unopenable or closed, the design for the structure must <br />also specify a ventilation or air-conditioning system to provide a habitable interior <br />environment. The ventilation system must not compromise the dwelling unit or <br />guest room noise reduction. <br />Based on current drawings, the first floor of each unit consists of non-occupied interior spaces <br />(garage, storage, unit entry) and this requirement would only apply to residential uses on <br />Levels 2 and 3. <br />NOISE SURVEY <br />Survey Method <br />To assess traffic noise exposure at the project site, we conducted a noise survey between <br />Monday, June 18th and Friday, June 22nd, 2018. The primary source of noise observed at the <br />project site was traffic on Lewelling Blvd with background noise controlled by distant traffic, <br />possibly from the nearby Interstate 880. Site noise exposure was assessed using both <br />unattended, long-term monitoring at a fixed location for multiple days, and attended short- <br />term noise readings on the project site. Refer to Figure 1 below for measurement positions. <br />59