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Air Quality and Greenhouse Gas Technical Report Griffith Energy Storage Project 1. Reduce emissions and decrease ambient concentrations of harmful pollutants; 2. Safeguard public health by reducing exposure to air pollutants that pose the greatest health risk, with an emphasis on protecting the communities most heavily impacted by air pollution; and 3. Reduce GHG emissions to protect the climate. In addition to updating the previously prepared ozone plan, the 2017 Clean Air Plan also serves as a multipollutant plan to protect public health and the climate. In its dual role as an update to the state ozone plan and a multipollutant plan, the 2017 Clean Air Plan addresses four categories of pollutants (BAAQMD 2017b): 00 Ground-level ozone and its key precursors, ROG and NOx; 30 Particulate matter: primary PM2.5, as well as precursors to secondary PM2.5; co Air toxics (e.g., TACs); and 30 GHGs The 2017 Clean Air Plan includes local guidance for the state implementation plan (SIP), which includes the framework for air quality basins to achieve attainment of the state and federal ambient air quality standards. One of the 2050 goals of the Clean Air Plan is to develop and deploy strategies for on-site battery storage. The Project will help the BAAQMD to meet this goal. Regulations and Rules The following BAAQMD regulations and rules would be applicable to the Project: Regulation 6, Rule 6, Prohibition of Trackout: This regulation prohibits the trackout from any active exit of a large construction or disturbed surface site onto an adjacent paved public roadway or shoulder of a paved public roadway that exceeds cumulative 25 linear feet and creates fugitive dust/visible emissions without cleaning up the trackout within 4 hours of when the owner/operator identifies excessive trackout. The rule also prohibits more than 1 quart of trackout to remain on an adjacent paved public roadway or the paved shoulder of a paved public roadway at the end of any workday. This rule applies to construction sites larger than 1 acre and applies to the Project during Project construction. 2.3 REGIONAL AND LOCAL AIR QUALITY CONDITIONS 2.3.1 San Joaquin Valley Air Basin Attainment Status In an effort to protect human health and welfare, the CARB and EPA have established Ambient Air Quality Standards. Areas are considered in "attainment' if standards are met and "nonattainment' if they are not met. For ozone, nonattainment status is further classified as marginal, moderate, serious, severe, or extreme. At the federal level, the SJVAB is designated as a "extreme" non-attainment area for the 8-hour ozone standard, nonattainment for PM2.5, and a maintenance area for PM,o. At the state level, the SJVAB is designated as a "severe" non-attainment area for 1-hour ozone standard, non-attainment for the 8-hour ozone standard, and non-attainment for both the PM,o and PM2.5 standards. The attainment classifications for the criteria pollutants are presented in Table 2. OTETRA TECH 15 July 2023