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Air Quality and Greenhouse Gas Technical Report Griffith Energy Storage Project VendorEquipment Daily Worker Daily Total Haul Construction Usage Vehicle Phase Equipment Type Quantity Gen-Tie Line Tractors/Loaders/Backhoes Pulling and 2 8 Stringing Testing and Off-Highway Trucks 3 8 100 0 0 Commissioning 'Number reflects daily one-way trips. 2Number reflects total one-way trips per phase. 2.4.2.2 Operation 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, on-site maintenance is expected to be required 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, operation 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. The expected maintenance would generate little traffic during operation. Heavy equipment would not be utilized during normal operation. Large or heavy equipment may be brought to the facility infrequently for equipment repair or replacement, or for vegetation control. 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. Operational emissions were estimated using CaIEEMod to include area, energy, and mobile source emissions. Operational assumptions, including equipment, solid waste, and water usage were based on information provided by the Applicant. There are no emissions expected with on-site energy use during operation. Electricity used on site would be supplied from the on-site batteries. Mobile sources would include motor vehicles (i.e., pickup trucks or light duty trucks)traveling to and from the site for infrequent maintenance. Based on conservative estimates, the Project is anticipated to have up to 130 round trips per year, accounting for regular operation and maintenance activities of two full-time-equivalent staff. 2.4.2.3 Ambient Air Quality Analysis Per the Guidance for Assessing and Mitigating Air Quality Impacts, an AAQA should be performed if the emissions of a pollutant from equipment used for on-site construction or on-site operation exceeds 100 lbs/day (SJVAPCD 2015a). 2.4.2,4 Health Risk Assessment Sensitive receptors are segments of the population most susceptible to poor air quality(i.e., children, the elderly, and those with pre-existing serious health problems related to respiratory distress). The area around the Project site is sparsely populated. The closest residences on land not owned by the current property owner are approximately 0.2 miles (approximately 1,000 feet) north of the Project site on the other side of West Patterson Pass and 0.2 miles (approximately 1,000 feet) southwest of the Project site at the southern terminus of Midway Road. SJVAPCD guidance (SJVAPCD 2015a)cites the Air Resources Board Handbook: Air Quality and Land Use Handbook:A Community Health Perspective (CARB 2005)and the California Air Pollution Control Officers Association (CAPCOA) Guidance OTETRA TECH 22 July 2023