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concentration of an air pollutant be estimated by multiplying the single -hour concentration by 10%.24 According to the Addendum, the nearest sensitive receptors are located approximately 55 feet, or 17 meters, from the Project boundary (p. 3.2-6). However, review of the AERSCREEN output files demonstrates that the MEIR is located approximately 75 meters from the Project site. Thus, the single - hour concentration estimated by AERSCREEN for Project construction is approximately 3.914 µg/m3 DPM at approximately 75 meters downwind. Multiplying this single -hour concentration by 10%, we get an annualized average concentration of 0.3914 µg/m3 for Project construction at the MEIR. For Project operation, the single -hour concentration estimated by AERSCREEN is 2.332 µg/m3 DPM at approximately 75 meters downwind. Multiplying this single -hour concentration by 10%, we get an annualized average concentration of 0.2332 µg/m3 for Project operation at the MEIR. We calculated the excess cancer risk to the MEIR using applicable HRA methodologies prescribed by OEHHA. Consistent with the Addendum's proposed 21- to 24-month construction schedule, the annualized average concentration for Project construction was used for the entire third trimester of pregnancy (0.25 years) and the first 1.49 years of the infantile stage of life (0 — 2 years) (p. 2-11). The annualized averaged concentration for operation was used for the remainder of the 30-year exposure period, which makes up the remaining 0.51 years of the infantile stage of life, the entire child stage of life (2 —16 years), and the entire the adult stage of life (16 — 30 years). Consistent with OEHHA, as recommended by the SCAQMD, BAAQMD, and SJVAPCD guidance, we used Age Sensitivity Factors ("ASF") to account for the heightened susceptibility of young children to the carcinogenic toxicity of air pollution.",z6," According to this guidance, the quantified cancer risk should be multiplied by a factor of ten during the third trimester of pregnancy and during the first two years of life (infant) as well as multiplied by a factor of three during the child stage of life (2 —16 years). We also included the quantified cancer risk without adjusting for the heightened susceptibility of young children to the carcinogenic toxicity of air pollution in accordance with older OEHHA guidance from 2003. This guidance utilizes a less health protective scenario than what is currently recommended by SCAQMD, the air quality district with jurisdiction over the City, and several other air districts in the state. Furthermore, in accordance with the guidance set forth by OEHHA, we used the 95`h percentile breathing rates for ""Screening Procedures for Estimating the Air Quality Impact of Stationary Sources Revised." EPA, 1992, available at: htti)://www.ei)a.gov/ttn/scram/guidance/guide/EPA-454R-92-019 OCR.pdf; see also "Risk Assessment Guidelines Guidance Manual for Preparation of Health Risk Assessments." OEHHA, February 2015, available at: htti)s://oehha.ca.gov/media/downloads/crnr/2015guidancemanual.1)df p. 4-36. 25 "Draft Environmental Impact Report (DEIR) for the Proposed The Exchange (SCH No. 2018071058)." SCAQMD, March 2019, available at: http://www.agmd.gov/docs/default-source/cega/comment- letters/2019/march/RVC190115-03.pdf?sfvrsn=8, p. 4. 26 "California Environmental Quality Act Air Quality Guidelines." BAAQMD, May 2017, available at: http://www.baagmd.gov/—/media/files/planning-and-research/cega/cega guidelines may2017-pdf.pdf?la=en, p. 56; see also "Recommended Methods for Screening and Modeling Local Risks and Hazards." BAAQMD, May 2011, available at: http://www. baag md.gov/—/media /Files/Planning%20a nd%2OResea rch/CEQA/BAAQMD%20M ode I i ng%2OApp roa c h.ashx, p. 65, 86. 27 "Update to District's Risk Management Policy to Address OEHHA's Revised Risk Assessment Guidance Document." SIVAPCD, May 2015, available at: https://www.vallevair.org/busind/pto/staff-report-5-28-15.pdf, p. 8, 20, 24. 17 75C-92