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Acoustical Analysis Report Griffith Energy Storage Project 1.0 OVERVI EW Tetra Tech has prepared this noise impact assessment forth e proposed Griffith Energy Storage Project(Project)to support an evaluation of compliance with applicable California Environmental Quality Act(CEQA) noise requirements and county noise ordinances,which are detailed in Section 2.0 of this report.Griffith Energy Storage, LLC(Applicant),is proposing to construct and operate the 400- megawatt Griffith Energy Storage Project to provide reliable and flexible power to the local electrical system.The property which the Project would be built on consists of 106 acres (Property) of land in San Joaquin County,while the site disturbance will be limited to 32 acres.The Project would interconnect at the Tesla Substation immediately adjacent to the site in Alameda County via a 230- kilovolt interconnection generation tie(gen-tie) line.The energy storage facility is anticipated to house lithium-ion batteries totaling 400 megawatts of energy. Project construction would be in 2024 and is anticipated to come online in 2025. 1.1 Project Setting The Property is approximately 0.9 mile southwest of Interstate 580 and approximately 5 miles southwest of the city of Tracy,adjacent to Pacific Gas and Electric's (PG&E)Tesla Substation,as shown on Figure 1.The Project site is private land zoned as Agricultural General-160 and designated as General Agriculture.The site includes Grazing Land and Farmland of Local Importance,as classified by the California Department of Conservation. 1.2 Acoustical Metricsand Terminology All sounds originate with a source,whether it is a human voice, motor vehicles on a roadway,or a combustion turbine. Energy is required to produce sound and this sound energy is transmitted through the air in the form of sound waves-tiny,quick oscillations of pressure just above and just below atmospheric pressure.These oscillations,or sound pressures, impinge on the ear,creating the sound we hear.A sound source is defined by a sound power level (abbreviated "LW"),which is independent of any external factors. By definition,sound power is the rate at which acoustical energy is radiated outward and is expressed in units of watts. A source sound power level cannot be measured directly. It is calculated from measurements of sound intensity or sound pressure at a given distance from the source outside the acoustic and geometric near-field.A sound pressure level (abbreviated "LP") is a measure of the sound wave fluctuation at a given receiver location and can be obtained through the use of a microphone or calculated from information about the source sound power level and the surrounding environment.The sound pressure level in decibels (dB) is the logarithm of the ratio of the sound pressure of the source to the reference sound pressure of 20 microPascals (µPa), multiplied by 20.The range of sound pressures that can be detected by a person with normal hearing is very wide, ranging from about 20 µPa for very faint sounds at the threshold of hearing,to nearly 10 million µPa for extremely loud sounds such as a jet during take-off at a distance of 300 feet. OTETRA TECH 1 August 2023