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5.9 PUBLIC HEALTH <br /> TABLE 5.9-5 <br /> Toxicity Values Used to Characterize Health Risks <br /> Inhalation Cancer <br /> Potency Factor Chronic Reference Exposure Acute Reference Exposure <br /> Toxic Air Contaminant (mg/kg-d)-1 Level (µg/m) Level (µg/m3) <br /> Acetaldehyde 0.010 9.00 — <br /> Acrolein — 0.06 0.19 <br /> Ammonia — 200 3,200 <br /> Benzene 0.10 60 1,300 <br /> 1,3-Butadiene 0.60 20 — <br /> Ethylbenzene 0.0087 2,000 — <br /> Formaldehyde 0.021 3.0 94 <br /> Hexane — 7,000 — <br /> Naphthalene 0.12 9.0 — <br /> PAHs(as BaP for HRA) 3.9 — — <br /> Propylene — 3,000 — <br /> Propylene oxide 0.013 30 3.100 <br /> Toluene — 300 37,000 <br /> Xylene — 700 22,000 <br /> Source: CARB/OEHHA, May 22, 2008. <br /> 5.9.4.5 Characterization of Risks from Toxic Air Pollutants <br /> The estimated potential maximum cancer risk associated with concentrations in air <br /> estimated for the MIR location is shown in Table 5.9-6. The maximum carcinogenic risk is <br /> well below the 10 x 10-6 threshold of significance for emitting units determined by the <br /> District to be applying T-BACT. <br /> TABLE 5.9.6 <br /> Summary of Potential Health Risks <br /> Carcinogenic <br /> Risk a Cancer Acute Health Chronic Health <br /> Receptor (per million) Burden Hazard Index Hazard Index <br /> Maximum Incremental Cancer Risk(MICR) 0.43 0.05 0.008 <br /> at PMI <br /> 0 <br /> Maximally Exposed Individual Worker b 0.045 n/a n/a <br /> (MEIW) <br /> Significance Level 10 1.0 1.0 1.0 <br /> 'Derived (Adjusted)Method used to determine significance of modeled risks. <br /> bThe worker is assumed to be exposed at the work location 8 hours per day, instead of 24, 245 days per year, <br /> instead of 365, and for 40 years, instead of 70.Therefore, a 70 year-based chronic HHI is not applicable to a <br /> worker. <br /> Cancer risks potentially associated with the project also were assessed in terms of cancer <br /> burden. Cancer burden is a hypothetical upper-bound estimate of the additional number of <br /> cancer cases that could be associated with emissions from the project. Cancer burden is <br /> SAC/371322/082340007(LEC_5.9_PUBLICHEALTH.DOC) 5.9-17 <br />