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5.9 PUBLIC HEALTH 5.9.4.3 Operations Impacts Potential human health impacts associated with LEC result from exposure to air emissions from operation of the natural gas-fired combined-cycle unit and auxiliary boiler and,to a much lesser extent,the cooling tower. The non-criteria pollutants emitted from the project include certain volatile organic compounds and polycyclic aromatic hydrocarbons (PAHs) from the combustion of natural gas and ammonia from the SCR NOx control systems. These pollutants are listed in Table 5.9-4,and the detailed emission summaries and calculations are presented in Appendix 5.1D. Emissions of criteria pollutants will not cause violations of the national or California ambient air quality standards as discussed in Section 5.1,Air Quality. The project will include Best Available Control Technology (BACT) as required under SJVAPCD rules. TABLE 5.9-4 Pollutants Emitted to the Air from Lodi Energy Center Criteria Pollutants Non-criteria Pollutants(Continued) Carbon monoxide Hexane Oxides of nitrogen Naphthalene Particulate matter Propylene Oxides of sulfur Propylene oxide Volatile organic compounds Toluene Xylene Non-criteria(Toxic) Pollutants Hexane Ammonia PAHs Acetaldehyde Benzo(a)anthracene Acrolein Benzo(a)pyrene 1,3-Butadiene Benzo flfluoranthene Benzene Benzo(k)fluoranthene Dichlorobenzene Chrysene Ethylbenzene Dibenz(a,h)anthracene Formaldehyde Indeno(1,2,3-cd)pyrene Air dispersion modeling results (see Section 5.1.5) show that emissions will not result in ambient concentrations of criteria pollutants that exceed ambient air quality standards,with the exception of the state PMlo and federal PM2.5 standards. For these pollutants,existing 24-hour and annual average PM10 and PM2.5 background concentrations already exceed ambient standards,while the project would not add a significant contribution. These standards are intended to protect the general public with a wide margin of safety.Therefore, the project will not have a significant impact on public health from emissions of criteria pollutants. The health risk assessment presented in this section was implemented using the latest version (1.4) of the CARB's Hotspots Analysis and Reporting Program (HARP) model,and associated guidance.14 14 OEHHA.Air Toxics Hot Spots Program Guidance Manual for Preparation of Health Risk Assessments,August 2003;and SDAPCD.Supplemental Guidelines for Submission of Air Toxics"Hot Spots"Program Health Risk Assessments(HRAs), March 2005. 5.9-12 SAC/371322/082340007(LEC_5.9_PUBLIC_HEALTH.DOC)