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Item No. 2 Public Comment_Yundt
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Item No. 2 Public Comment_Yundt
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6 <br /> <br /> where: <br />DoseAIR = dose by inhalation (mg/kg/day), per age group <br />CPF = cancer potency factor, chemical-specific (mg/kg/day)-1 <br />ASF = age sensitivity factor, per age group <br />FAH = fraction of time at home, per age group (for residential receptors only) <br />ED = exposure duration (years) <br />AT = averaging time period over which exposure duration is averaged (always 70 years) <br />Consistent with the 363-day construction schedule, the annualized average concentration for <br />construction was used for the entire third trimester of pregnancy (0.25 years), and the first 0.74 years of <br />the infantile stage of life (0 – 2 years). The annualized average concentration for operation was used for <br />the remainder of the 30-year exposure period, which makes up the latter 1.26 years of the infantile <br />stage of life, as well as the entire child (2 – 16) and adult (16 – 30 years) stages of life. The results of our <br />calculations are shown in the table below. <br />The Maximally Exposed Individual at an Existing Residential Receptor <br />Age Group Emissions Source Duration (years) Concentration <br />(ug/m3) Cancer Risk <br />3rd Trimester Construction 0.25 0.1049 1.43E-06 <br /> Construction 0.74 0.1049 1.28E-05 <br /> Operation 1.26 0.2849 5.87E-05 <br />Infant (0 - 2) Total 2 7.16E-05 <br />Child (2 - 16) Operation 14 0.2849 1.03E-04 <br />Adult (16 - 30) Operation 14 0.2849 1.15E-05 <br />Lifetime 30 1.88E-04 <br />As demonstrated in the table above, the excess cancer risks for the 3rd trimester of pregnancy, infants, <br />children, and adults at the MEIR located approximately 200 meters away, over the course of Project <br />construction and operation, are approximately 1.43, 71.6, 103, and 11.5 in one million, respectively. The <br />excess cancer risk over the course of a residential lifetime (30 years) is approximately 188 in one million. <br />The infant, child, adult, and lifetime cancer risks exceed the SCAQMD threshold of 10 in one million, thus <br />resulting in a potentially significant impact not previously addressed or identified by the EA. <br />Our analysis represents a screening-level HRA, which is known to be conservative and tends to err on <br />the side of health protection. The purpose of the screening-level HRA is to demonstrate the potential <br />link between Project-generated emissions and adverse health risk impacts. According to the U.S. EPA:
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