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Acoustical Analysis Report Griffith Energy Storage Project during nighttime. Noise sources associated with construction are exempt from these maximum noise levels, provided construction does not occur before 7:00 a.m.or after 7:00 p.m.on a weekday,and before 8:00 a.m. or after 5:00 p.m. on the weekend. Section 6.60.050(8)states the limits related to vibration. Operating or permitting the operation of any device that creates a vibration which is above the vibration perception threshold of an individual at or beyond the property boundary of the source if on private property or at one hundred fifty(150)feet (forty-six(46) meters)from the source if on a public space or public right-of-way. 2.5 Alameda County General Plan and East County Area Plan Noise Element The Alameda County General Plan Noise Element does not contain regulations for acceptable noise levels.The ECAP does contain one policy that pertains to acceptable noise levels and is applicable to the Project(Alameda County 2000): Policy 288: The County shall endeavor to maintain acceptable noise levels throughout East County. 3.0 EXISTI NG SOUND ENVI RONMENT The Project is bounded to the north by grazing land, rural residences,the West Patterson Pass,and the Union Pacific Railroad.To the east lies grazing land and open space. Rural residences,grazing land,and open space bound the Project to the south.The Project is bounded by rural residences,grazing land,and the PG&E Tesla Substation to the west. The most significant sources of noise in the vicinity of the Project are vehicular traffic on Interstate 580 and the local street network. Railroad trains intermittently generate noise levels that are significant along the railroad tracks. General aviation aircraft using the Tracy Municipal Airport also contribute to intermittent noise levels. Noise is also generated on individual parcels whether industrial,office, retail or residential. The San Joaquin County 2035 General Plan EIR contains ambient noise monitoring results at several locations within the County.The closest monitoring location is approximately 2.5 miles northeast of the Project site and shows an Leq ranging from 39-45 dBA during the morning,44-50 dBA during the afternoon,and 40-47 dBA during the night.The General Plan also shows an Lma"ranging from 51-66 dBA during the morning,58-78 dBA during the afternoon,and 47-68 dBA during the night. OTETRA TECH 7 August 2023