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4 Environmental Analysis <br /> 4.3 Air Quality <br /> The Project would comply with SJVAPCD Rule 8021 to control dust emissions generated during <br /> grading activities. Standard construction practices that would be employed to further reduce <br /> fugitive dust emissions are provided in Mitigation Measure AQ-2 to ensure their implementation. <br /> The Project would also use of Tier 4 engines for construction equipment to reduce NOx and DPM <br /> emissions and meet the requirements of Rule 9510 as noted in Mitigation Measure AQ-1. In <br /> addition to dust control measures, the use of Tier 4 engines (Mitigation Measure AQ-1) was <br /> incorporated to CaIEEMod. For the purpose of this assessment, it was assumed that all off-road <br /> diesel equipment greater than 85 horsepower would meet USEPA Tier 4 off-road emission <br /> standards or equivalent. <br /> Mitigation: None required; however, the Applicant-proposed compliance with Rule 9510, <br /> preparation of a Dust Control Plan, and Valley Fever prevention measures have been included <br /> as Mitigation Measures AQ-1, AQ-2, and AQ-3, respectively, to ensure their implementation. <br /> 4.3.7 Mitigation Measures <br /> Impacts from the Project are less than significant; however, the following typical project design <br /> elements are included as mitigation measures to ensure Applicant-proposed design measures <br /> are implemented to reduce impacts to air quality. <br /> AQ-1: Implement NOx and diesel PM,o emission-reduction measures during construction. To <br /> control NOx and diesel PMto emissions during construction and in accordance with <br /> Rule 9510, the Project proponent/operator and/or its contractor(s) shall implement the <br /> following measures during construction of the project, subject to verification by the <br /> County: <br /> oc Off-road equipment engines over 85 horsepower shall be equipped with <br /> USEPA Tier 4 engines unless Tier 4 construction equipment is not locally <br /> available. <br /> x All equipment shall be maintained in accordance with the manufacturer's <br /> specifications. <br /> x Construction-related equipment, including heavy duty equipment, motor <br /> vehicles, and portable equipment, shall be turned off when not in use for more <br /> than 5 minutes. <br /> x Notification shall be provided to trucks and vehicles in loading or unloading <br /> queues that their engines shall be turned off when not in use for more than 5 <br /> minutes. <br /> x Electric equipment shall be used to the extent feasible in lieu of diesel- or <br /> gasoline-powered equipment. <br /> oo All construction vehicles shall be equipped with proper emissions control <br /> equipment and kept in good and proper running order to substantially reduce <br /> NOx emissions. <br /> Griffith Energy Storage Project 4.3-30 Tetra Tech/SCH 2022120675 <br /> Draft Environmental Impact Report August 2023 <br />