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5.9 PUBLIC HEALTH concentration of each TAC with acute health effects is divided by the specific TAC's acute REL to obtain a health hazard quotient for health effects caused by relatively high, short-term exposure to air toxics. An additional conservative procedure in this health risk assessment is that the health hazard quotients for all TACs having potential acute impacts were summed regardless of target organ. This method leads to an upper bound assessment. RELs used in the hazard index calculations were those published in the CARB/OEHHA listings dated May 2008. 5.9.4.2 Construction Impacts Construction of LEC is expected to take approximately 24 months. No significant public health effects are expected during construction. Strict construction practices that incorporate safety and compliance with applicable LORS will be followed. In addition,mitigation measures to reduce air emissions from construction impacts will be implemented as described in Section 5.1. Temporary air emissions from construction are presented in detail in Appendix 5.1E, followed by a criteria pollutant air dispersion analysis that demonstrates ambient air quality standards will not be exceeded by construction of the project. The dominant emission with potential health risk is Diesel particulate matter (DPM) from combustion of Diesel fuel in construction equipment (e.g.,cranes, dozers, excavators, graders,front-end loaders, backhoes).DPM emissions from construction are summarized in Table 5.9-3. TABLE 5.9-3 Maximum Construction DPM Emissions Emitting Activity Pounds per Day Tons per Year Construction Equipment 4.5 0.4 The detailed HRA calculations in Appendix 5.1D demonstrate that the potential cancer risk of DPM emissions during project construction will exceed the significance threshold of 10 in one million,based on adjusting the 70-year lifetime risk for a period of 9 years in accordance with OEHHA (2003) guidance. The resulting maximum cancer risk would be approximately 24 in one million. The area in which the 10 in one million risk level barely extends beyond the construction and laydown/parking areas and does not include any residences or sensitive receptors (see Figure 5.9-3). Ambient air modeling for PM1o, CO,SO2,and NO2 was performed as described in Section 5.1.5.3 and Appendix 5.1D. Construction-related emissions are temporary and localized,resulting in no long-term significant impacts to the public. Small quantities of hazardous waste may be generated during the life of the project. Hazardous waste management plans will be in place so the potential for public exposure is minimal. Refer to Section 5.14,Waste Management,for more information. No acutely hazardous materials will be used or stored on-site during construction (see Section 5.5, Hazardous Materials Handling). To assure worker safety during construction, safe work practices will be followed (see Section 5.16,Worker Health and Safety). SACI371322I082340007(LEC_5.9_PUBLIC_HEALTH.DOC) 5.9-11