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Air Quality and Greenhouse Gas Technical Report Griffith Energy Storage Project Document: Health Risk Assessments for Land Use Projects(CAPCOA 2009)for determining when and how to conduct risk assessments. Both documents include recommendations for buffer distances for siting sensitive receptors near various types of common sources. The project type and buffer distance are as follows: 00 Freeways and high traffic roads—Sensitive receptors should be sited at least 500 feet from freeways or urban roads with 100,000 vehicles per day or rural roads with 50,000 vehicles per day. 00 Distribution centers—Sensitive receptors should be sited at least 1,000 feet from distribution centers accommodating more than 100 trucks per day or more than 40 trucks per day with operating transport refrigeration units. 00 Railyards—Sensitive receptors should be sited at least 1,000 feet from a major service and maintenance rail yard. Sensitive receptors sited within one mile of a major service and maintenance railyard should consider mitigation and/or restrictions. 00 Ports—Avoid siting of new sensitive land uses immediately downwind of ports in the most heavily impacted zones. 00 Refineries—Avoid siting new sensitive land uses immediately downwind of petroleum refineries. oo Chrome Platers—Avoid siting new sensitive land uses within 1,000 feet of a chrome plater. 00 Dry Cleaners using Perch loroethylene—Avoid siting new sensitive land uses within 300 feet of any dry-cleaning operation. For operations with two or more machines, provide 500 feet. For operations with three or more machines, consult with the local air district. Do not site new sensitive land uses in the same building with perch loroethylene dry cleaning operations. oo A Gasoline Dispensing Facility—Avoid siting new sensitive land uses within 300 feet of a large gas station (defined as a facility with a throughput of 3.6 million gallons per year or greater). A 50-foot separation is recommended for typical gas dispensing facilities. The Project is an industrial project but does not fit into any of the project categories above. The reference distances from the CARB Air Quality and Land Use Handbook are not being used to analyze how existing conditions might impact future users or residents, but can be used as guidance to demonstrate that nearby residences are at an appropriate buffer distance to the project. As previously noted, the closest residence on land not owned by the Project's current property owner is located approximately 1,000 feet from the Project boundary. Tracy is located approximately 7 miles from the site. SJVAPCD also provides significance thresholds for TACs: Exposes sensitive receptors to substantial pollutant concentrations, including those resulting in: oo A cancer risk greater than or equal to 20 in a million, and/or oc A Hazard Index (non-cancerous)greater than or equal to 1. A HRA was not conducted for the Project. A qualitative discussion of Diesel Particulate Matter(DPM) risk is provided in Section 2.5.4. 2.5 IMPACT ANALYSIS The Project is expected to have emissions less than 100 lbs/day for all pollutants during on-site construction. Therefore, Project construction emissions will not cause or contribute to a violation of an ambient air quality standard by exceeding any CAAQS or NAAQS. Since operational activities would be minimal and are also well below the modeling threshold, ambient air quality modeling was not performed for operational emissions. OTETRA TECH 23 July 2023