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for CECA Services Associated with McFadden and Fairview Development Project Task 2 Deliverables: o One (1) electronic version of the Air Quality and Greenhouse Gas Emissions Assessment Report. Task 3 — Health Risk Assessment The Proposed Project would be a source of gasoline vapors that would include Toxic Air Contaminants (TACs) such as benzene, methyl tertiary -butyl ether, toluene, and xylene. Gasoline vapors are released during the filling of stationary storage tanks and during the transfer from those tanks to individual vehicles. Thus, a Health Risk Assessment (HRA) evaluating the potential health risk to the surrounding receptors, including the sensitive residential receptors to the north, west, and south of the Project Site, is required. The air dispersion modeling for the HRA will be performed using the U.S. Environmental Protection Agency (EPA) AERMOD dispersion model. AERMOD is a steady-state, multiple -source, Gaussian dispersion model designed for use with emission sources situated in varying terrain. AERMOD requires hourly meteorological data consisting of wind vector, wind speed, temperature, stability class, and mixing height. Health risk modeling associated with the identified gasoline vapor concentrations will be completed using the HARP2 model with regulatory default settings. HARP2 implements the latest regulatory guidance to develop inputs to the U.S. EPA AERMOD dispersion model for dispersion and has the inputs for calculations for the various health risk levels. Health risk impacts from Proposed Project related TACs would be addressed based on the Project's proximity to vicinity receptors and the likelihood and potential level of potential exposure. The quantitative impact analysis will involve the development of an emissions inventory for TAC sources (i.e., gasoline dispensers and storage tanks), dispersion modeling to determine concentrations at sensitive receptors, and determination of the chronic and acute health impacts along with the projected increase in cancer risk due to exposure to TACs. Project emission of gasoline vapors will be based on the estimated annual gallons of gasoline throughput provided by the Project applicant. The HRA would be prepared in accordance with the California Air Resources Board's Gasoline Service Station Risk Assessment. The modeled concentrations will be used to estimate the increased cancer risk and health hazard in accordance with the California Environmental Protection Agency's Office of Environmental Health Hazard Assessment Air Toxics Hot Spots Program Risk Assessment Guidelines - The Air Toxics Hot Spot Program Guidance Manual for Preparation of Health Risk Assessment. The assessment will present background information on TACs and health risks, the assumptions used for the modeling and modeling methodology, and the results of the analysis. Pollutant concentrations and corresponding cancer risk from the Project will be identified. ECORP proposes to evaluate potential health risk in the body of the Air Quality and Greenhouse Gas Emissions Impact Assessment Report. The analysis will be supported by modeling documentation, October2024 N 2 ECOConsulting, ENVIRONON MENTAL CONSULTANTS P23-481.02