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2 Project Description Due to the sloped topography of the energy storage facility 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 off-site. A relatively balanced cut and fill volume of just over 400,000 cubic yards of material would be handled, and result in several large 2:1 (horizontal to vertical) cut and fill slopes. The maximum depth of cut will be approximately 70 feet and the maximum depth of fill will be about 40 feet. 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 to 2 units horizontal (50 percent slope). 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 and a maximum of 20 feet, consistent with the San Joaquin County Grading Ordinance (San Joaquin County 2021). Additionally, no grading that may obstruct, impede, or interfere with the natural flow of storm waters would occur. The Project would include swales and armored outlets to direct stormwater, as shown in the preliminary grading and site plan provided as Figure 2-2. Construction of the Project would result in the addition of 18.8 acres of impervious surfaces, consisting of foundations, pads, gen-tie and fence poles, and other permanent facilities. 2.5.3.4 Fencing A perimeter security fence would be installed around the energy storage system facility. No fencing would be included around the gen-tie line, and the tie-in to the PG&E Tesla substation would occur within the existing PG&E substation fenceline. Any acoustic fencing is required around the energy storage facility as a form of mitigation to reduce the sound levels at the nearby residential receivers, the fencing would consist of opaque material. Trash would be removed from the fencing as required. A security fence would also be installed around the Project substation. 2.5.3.5 Electrical Work A substation pad for the step-up transformer would be poured, followed by the installation of the medium-voltage stations, wiring of the modules through combiner boxes, and construction of the Project substation and grid interconnection. The medium-voltage stations would sit on concrete foundations or driven piles, pending final design. The Project substation and medium-voltage stations would be within the 32-acre battery energy storage facility footprint. 2.5.3.6 Generation Tie-line and Tesla Substation Improvements The Applicant would be responsible for siting, design, and construction of the gen-tie line from the Project substation to the point of change of ownership (POCO or tie-in). That portion of the gen-tie line will be an overhead line, as shown on Figure 2-1. The gen-tie line would require new steel, tubular poles up to approximately 165 feet in height. The poles may be A-frame, H-frame, monopole, or a combination thereof. The number and height of the poles would be finalized during detailed design. PG&E would be responsible for siting, design, and construction of the gen-tie transmission line from the POCO to their existing Tesla Substation. Two options are available for the gen-tie line route from this point and, therefore, both options are evaluated in this document. The first option Griffith Energy Storage Project 2-12 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023