ARCHIVED REPORTS LEC APPLICATION FOR CERTIFICATION

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5.1 AIR QUALITY 5.1.7.4 Screening Health Risk Assessment Pursuant to the SJVAPCD Integrated Air Toxics program,a health risk screening must be executed to determine the potential impact on public health resulting from the worst-case emissions of toxic air contaminants (TACs) from the proposed project. The impact on public health due to the emission of these compounds was assessed utilizing air pollutant dispersion models. A screening health risk assessment has been prepared that includes the CTG/HRSG and the auxiliary boiler. The results of the revised screening health risk assessment are presented in Table 5.1-46.A detailed discussion of the screening health risk assessment procedures and assumptions is provided in Appendix 5.1D to this application. TABLE 5.1-46 Screening Health Risk Assessment Results Residential Worker Cancer Cancer Risk(in Risk(in one Chronic Health Acute Health Source one million) million) Hazard Index Hazard Index Gas Turbine/HRSG, 0.43 0.04 0.08 0.05 Aux. Boiler The maximum cancer risk from the facility is well below the 1 in one million level that is considered to be significant. The acute and chronic health hazard indices are well below 1.0. 5.1.8 Cumulative Air Quality Impacts Analysis An analysis of potential cumulative air quality impacts that may result from the project and other reasonably foreseeable projects is generally required only when project impacts are significant. To ensure that potential cumulative impacts of the project and other nearby projects are adequately considered,a cumulative impacts analysis has been conducted in accordance with the protocol included as Appendix 5.1G. The analysis demonstrates that the project will not cause or contribute to any significant cumulative air quality impacts. 5.1.9 Mitigation Measures Mitigation will be provided for project emissions in the form of offsets and the installation of BACT, as required under SJVAPCD regulations. The cumulative air quality impacts analysis described in Appendix 5.1G shows that the project will not result in significant cumulative impacts and that sufficient ERCs are being provided to mitigate all project emissions. 5.1.10 Agencies and Agency Contacts Each level of government has adopted specific regulations that limit emissions from stationary combustion sources,several of which are applicable to this project. The other air agencies having permitting authority for this project are shown in Table 5.1-47. The applicable federal LORS and compliance with these requirements were discussed in detail in Sections 5.1-6 and 5.1-7 above. The SJVAPCD will review the application for a District SAC/371322/082410013(LEC_5.1_AIR_QUALITY.DOC) 5.1-75