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4 Environmental Analysis 4.13 Noise oo Maintain all construction tools and equipment in good operating order according to manufacturers' specifications; oo Limit use of major excavating and earth-moving machinery to daytime hours (7:00 a.m. to 7:00 p.m.); oo To the extent practicable, schedule construction activity during normal working hours on weekdays when higher sound levels are typically present and are found acceptable. Some limited activities, such as concrete pours, would be required to occur continuously until completion; oo Equip any internal combustion engine used for any purpose on the job or related to the job with a properly operating muffler that is free from rust, holes, and leaks; oo For construction devices that utilize internal combustion engines, ensure the engine's housing doors are kept closed, and install noise-insulating material mounted on the engine housing consistent with manufacturers' guidelines, if possible; oo Limit possible evening shift work to low noise activities such as welding, wire pulling, and other similar activities, together with appropriate material handling equipment; and oo Utilize a Complaint Resolution Procedure to address any noise complaints received from residents. Operation The Cadna-A® computer noise model was used to calculate sound pressure levels from the operation of the Project equipment in the vicinity of the Project site. The current ISO standard for outdoor sound propagation, ISO 9613 Part 2 — Attenuation of Sound during Propagation Outdoors,was used within Cadna-A(ISO 1996). The method described in this standard calculates sound attenuation under weather conditions that are favorable for sound propagation, such as for downwind propagation or atmospheric inversion, conditions which are typically considered worst- case. Off-site topography was obtained using the publicly available USGS digital elevation data. A default ground attenuation factor of 0.5 was assumed for off-site sound propagation over acoustically "mixed" ground. The Project's general arrangement was reviewed and directly imported into the acoustic model so that onsite equipment could be easily identified, buildings and structures could be added, and sound emission data could be assigned to sources as appropriate. If final equipment selection should differ from the equipment that has been analyzed, another acoustical evaluation will be done to determine compliance with the applicable regulations. The primary noise sources during operations are the transformers and battery storage heating, ventilation, and air conditioning (HVAC) units. It is expected that all equipment would operate in a consistent manner during both daytime and nighttime hours. Reference sound power levels input to Cadna-A were provided by the Applicant (Burns and McDonnell 2021). The sound levels that were provided show that operation of the inverter/transformers will produce a sound pressure level of 80.5 dBA measured at 3 feet, and that operation of the battery storage and HVAC equipment will produce 70 dBA measured at 3 feet. The proposed BESS would deliver power to the Tesla Substation located adjacent to the Project site in Alameda County through a new 230-kilovolt gen-tie line. The Applicant would construct the gen-tie from the Project substation to the point south of the Tesla Substation. There are no planned modifications to the Tesla Substation as part of the Project. The Electric Power Research Institute has conducted several studies of corona effects (EPRI 1978, 1987). The typical noise Griffith Energy Storage Project 4.13-12 Tetra Tech/2022120675 Draft Environmental Impact Report August 2023