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4 Environmental Analysis 4.13 Noise IMPACT 4.13-2: Would the project result in generation of excessive groundborne vibration or groundborne noise levels?(Less than Significant Impact) This vibration analysis evaluated the worst-case vibration source, which would be the pile driver. Based on vibration propagation calculations, construction vibration levels are predicted to be 0.00255 PPV in/sec, or 56 VdB, at the nearest non-participating residential receptor, which is approximately 1,000 feet from the site. These levels are based on the worst-case vibration producing equipment and it is expected that other vibration generating equipment proposed for the Project construction would result in lower vibration levels. Vibration levels at the nearest non- participating sensitive receptor will be below the minimum vibration level for human perception of 65 VdB. The only significant source of vibration resulting from the Project would occur during construction. Vibration levels have been analyzed and are not expected to be disturbing for human perception thresholds or detrimental to nearby structures throughout the duration of construction. Once construction is completed, the Project is not expected to have any significant operational vibration. The Project as a whole is considered to have a less than significant impact to excessive ground- borne vibration or ground-borne noise levels. Mitigation: None required. IMPACT 4.13-3: For a project within the vicinity of a private airstrip or an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? (No Impact) The Project is not within 2 miles of a public airport or public use airport or in the vicinity of a private airstrip or an airport land use plan. There would be no impact. Mitigation: None required. 4.13.5 Mitigation Measures The following mitigation measures are recommended to reduce significant impacts to noise resources. NOISE-1: The Project will include sound walls along the perimeter of the Project and between select BESS units. The sound walls will be of various heights and at least 3 pounds per square foot with minimal cracks or gaps. This mitigation measure is a result of the current operational equipment selected for the Project. When updated equipment is selected, another assessment will be conducted to evaluate the need for this mitigation measure. The same performance thresholds presented in this report will be used as a determination of significant impact when assessing any updated equipment, i.e., the San Joaquin County Ordinance Code and a 3 dB increase over ambient. NOISE-2: The Project shall construct soundwalls on the western and eastern portions of the Project site to shield the surrounding residential properties. The sound walls will comprise the following dimensions: Griffith Energy Storage Project 4.13-17 Tetra Tech/2022120675 Draft Environmental Impact Report August 2023