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Visual Impact Assessment Griffith Energy Storage Project 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 steeperthan one unit vertical in two units horizontal(50 percent slope).Transition slopes between terraces would occur at a one unit vertical to four 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 and a maximum of 20 feet,consistent with the San Joaquin County Grading Ordinance(San Joaquin County 2021). Additionally, no grading which 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. Fencing A perimeter security fence would be installed around the BESS facility.Trash would be removed from the fencing as required.A security fence would also be installed around the Project substation. 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. 3.1.5 Operations and Maintenance Once constructed,the Project would operate 7 days per week,365 days per year.The facility would be operated by the Applicant or an affiliated company remotely. Periodic augmentation of batteries within the Project site may occur. Only occasional onsite maintenance is expected following commissioning, including replacement of inverter power modules,filters,and miscellaneous electrical repairs on an as-needed basis. No permanent sanitary facilities would be required. During operation of the Project substation,operations and maintenance staff would visit the substation periodically for switching and other operation activities. Maintenance trucks would be utilized to perform routine maintenance, including, but not limited to,equipment testing, monitoring, repair, routine procedures to ensure service continuity,and standard preventative maintenance. Routine operations would require one or two workers in a light utility truck to visit the facility on a weekly basis.Typically,one major maintenance inspection would take place annually. OTETRA TECH 9 August 2023