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Project Description Griffith Energy Storage Project Prevention Plan (SWPPP), or similar plan that incorporates stormwater best management practices (BMPs) to reduce the adverse effects of erosion and sedimentation. Such practices would include, for example, the use of water trucks to manage dust; silt fencing, straw wattles and temporary catch basins, and inlet filters to control stormwater; and truck tire muck shakers, or similar devices, to prevent mud and debris from being carried onto roadways. Landscaping The Project would not include landscaping. CONSTRUCTION Construction Access and Deliveries Delivery of material and supplies would reach the Project site through on-road truck delivery through Interstate 580 to Patterson Pass Road to Midway Road. The majority of the truck deliveries would be for the energy storage enclosures and PCS installation, as well as any aggregate material that may be required for foundations. These loads would typically be limited to 40 tons, or 80,000 pounds, with a typical cargo load of approximately 25 tons, or 50,000 pounds. Typically, rock is delivered in "bottom dump trucks" or"transfer trucks"with six axles. Low-bed transport trucks would transport the construction equipment to the site as needed. The size of the low-bed trucks (axles for weight distribution)would depend on the equipment transported. The heaviest delivery loads to the site would be for the step-up transformer, which may weigh up to 160,000 pounds. Construction Schedule Construction would generally consist of the following activities: • Site Preparation • Fencing • Electrical Work Grading and Site Preparation The site would be prepared for construction. Rough grading may be performed where required to accommodate the support structures and access roads. Grubbing and grading would occur on the site to achieve the required surface conditions. Site preparation may include application of pre-emergent herbicides formulated to minimize impacts on wildlife. Application would be in accordance with federal, state, and San Joaquin County regulations and would be applied by a California state-licensed pesticide applicator. Retention basins, if required,would be created for hydrologic control. Access roads would be gravel or aggregate base depending on the final site geotechnical report. A temporary staging area, anticipated to be located on the southwest end of the site, would be constructed to hold materials and construction equipment. Due to the sloped topography of the Project site, site preparation would require approximately 407,000 cubic yards of cut and 406,000 cubic yards of fill, to create a single terrace on which the batteries would be installed. The balance of fill would be transported offsite. Slopes of all cuts and fills would be no steeper than is safe for the intended use and shall be no steeper than 1 unit vertical in 2 units horizontal (50 percent slope). Transition slopes between terraces would occur at a 1 unit vertical to 4 units horizontal. The top of a cut slope would not be made nearer to a site boundary line than one-fifth of the vertical height of cut with a minimum of 2 feet and a maximum of 10 feet, and the toe of fill slope would be made not nearer to the site boundary line than one half the height of the slope with a minimum of 2 feet June 2022 4 Griffith Energy Storage, LLC