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12 <br /> <br />years). The annualized average concentration for operation was used for the remainder of the 30-year <br />exposure period, which makes up the remainder of the infantile stage of life (0 – 2 years), child stages of <br />life (2 – 16 years) and adult stages of life (16 – 30 years). Consistent with OEHHA, SCAQMD, BAAQMD, <br />and SJVAPCD guidance, we used Age Sensitivity Factors (ASFs) to account for the heightened <br />susceptibility of young children to the carcinogenic toxicity of air pollution.20, 21, 22, 23 According to this <br />guidance, the quantified cancer risk should be multiplied by a factor of ten during the third trimester of <br />pregnancy and during the first two years of life (infant) as well as multiplied by a factor of three during <br />the child stage of life (2 to 16 years). We also included the quantified cancer risk without adjusting for <br />the heightened susceptibility of young children to the carcinogenic toxicity of air pollution in accordance <br />with older OEHHA guidance from 2003. This guidance utilizes a less health protective scenario than what <br />is currently recommended by SCAQMD, the air quality district responsible for the City, and several other <br />air districts in the state. Furthermore, in accordance with guidance set forth by OEHHA, we used the 95th <br />percentile breathing rates for infants.24 Finally, according to SCAQMD guidance, we used a Fraction of <br />Time At Home (FAH) Value of 1 for the 3rd trimester and infant receptors.25 We used a cancer potency <br />factor of 1.1 (mg/kg-day)-1 and an averaging time of 25,550 days. The results of our calculations are <br />shown below. <br />The Closest Exposed Individual at an Existing Residential Receptor <br />Activity Duration <br />(years) <br />Concentration <br />(ug/m3) <br />Breathing <br />Rate (L/kg- <br />day) <br />Cancer Risk <br />without <br />ASFs* <br />ASF <br />Cancer <br />Risk with <br />ASFs* <br />Construction 0.25 0.05355 361 7.3E-08 10 7.3E-07 <br /> <br />20 “Risk Assessment Guidelines Guidance Manual for Preparation of Health Risk Assessments.” OEHHA, February <br />2015, available at: https://oehha.ca.gov/media/downloads/crnr/2015guidancemanual.pdf. <br />21 “Draft Environmental Impact Report (DEIR) for the Proposed The Exchange (SCH No. 2018071058).” SCAQMD, <br />March 2019, available at: http://www.aqmd.gov/docs/default-source/ceqa/comment- <br />letters/2019/march/RVC190115-03.pdf?sfvrsn=8, p. 4. <br />22 “California Environmental Quality Act Air Quality Guidelines.” BAAQMD, May 2017, available at: <br />http://www.baaqmd.gov/~/media/files/planning-and-research/ceqa/ceqa_guidelines_may2017-pdf.pdf?la=en, p. <br />56; see also “Recommended Methods for Screening and Modeling Local Risks and Hazards.” BAAQMD, May 2011, <br />available at: <br />http://www.baaqmd.gov/~/media/Files/Planning%20and%20Research/CEQA/BAAQMD%20Modeling%20Approac <br />h.ashx, p. 65, 86. <br />23 “Update to District’s Risk Management Policy to Address OEHHA’s Revised Risk Assessment Guidance <br />Document.” SJVAPCD, May 2015, available at: https://www.valleyair.org/busind/pto/staff-report-5-28-15.pdf, p. 8, <br />20, 24. <br />24 “Supplemental Guidelines for Preparing Risk Assessments for the Air Toxics ‘Hot Spots’ Information and <br />Assessment Act,” June 5, 2015, available at: http://www.aqmd.gov/docs/default-source/planning/risk- <br />assessment/ab2588-risk-assessment-guidelines.pdf?sfvrsn=6, p. 19. <br />“Risk Assessment Guidelines Guidance Manual for Preparation of Health Risk Assessments.” OEHHA, February <br />2015, available at: https://oehha.ca.gov/media/downloads/crnr/2015guidancemanual.pdf <br />25 “Risk Assessment Procedures for Rules 1401, 1401.1, and 212.” SCAQMD, August 2017, available at: <br />http://www.aqmd.gov/docs/default-source/rule-book/Proposed- <br />Rules/1401/riskassessmentprocedures_2017_080717.pdf, p. 7.