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4 Environmental Analysis 4.3 Air Quality oo On-road and off-road diesel equipment shall use diesel particulate filters (or the equivalent) if permitted under manufacturer's guidelines. oo Existing electric power sources shall be used to the extent feasible. This measure would minimize the use of higher polluting gas or diesel generators. oo The hours of operation of heavy-duty equipment and/or the quantity of equipment in use shall be limited to the extent feasible. AQ-2: Prepare and implement a dust control plan in accordance with Rule 8021 and Table 8021-1. The Project proponent/operator and/or its contractor(s) shall implement the following measures during construction of the Project, subject to verification by the County. The plan shall include all SJVAPCD-recom mended measures, including, but not limited to, the following: 0o Pre-water the site before construction begins. Land clearing, grubbing, scraping, excavation, land leveling, grading, cut and fill, and demolition activities shall be effectively controlled utilizing application of water or by presoaking to limit visible dust emissions to less than 20 percent opacity. oo Phase work to reduce the amount of disturbed area at any one time. oo Minimize and clean up track-out onto paved roads. oo Cover haul trucks. oo Rapid cleanup of Project-related track-out or spills on paved roads. oo Minimize grading and soil movement when winds exceed 30 miles per hour. oo Implement a speed limit of 15 miles per hour during all construction phases for vehicles traveling on unpaved roads. AQ-3: Minimize exposure to potential Valley Fever-containing dust. To minimize personnel and public exposure to potential Valley Fever-containing dust onsite and offsite, the following control measures shall be implemented during Project construction: oo Equipment, vehicles, and other items shall be thoroughly cleaned of dust before they are moved offsite to other work locations. oo Wherever possible, grading and trenching work shall be phased so that earth- moving equipment is working well ahead or downwind of workers on the ground. oo The area immediately behind grading or trenching equipment shall be sprayed with water before ground workers move into the area. oo In the event that a water truck runs out of water before dust is sufficiently dampened, ground workers being exposed to dust shall leave the area until a truck can resume water spraying. oo All heavy duty earth-moving vehicles shall be closed-cab and equipped with an high efficiency particulate-filtered air system. Griffith Energy Storage Project 4.3-31 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023