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infants.28 Finally, according to SCAQMD guidance, we used a Fraction of Time At Home ("FAH") Value of <br />1 for the 3rd trimester and infant receptors.29 We used a cancer potency factor of 1.1 (mg/kg-day)-' and <br />an averaging time of 25,550 days. The results of our calculations are shown below. <br />The Maximum Exposed Individual at an Existing Residential Receptor (MEIR) <br />Cancer <br />Duration <br />Concentration <br />Breathing <br />Cancer Risk <br />Activity <br />ASF <br />Risk with <br />(years) <br />(ug/m3) <br />Rate (L/kg-day) <br />without ASFs* <br />ASFs* <br />Construction <br />0.25 <br />0.3914 <br />361 <br />5.3E-07 <br />10 <br />5.3E-06 <br />3rd Trimester <br />3rd Trimester <br />0.25 <br />5.3E-07 <br />5.3E-06 <br />Duration <br />Exposure <br />Construction <br />1.49 <br />0.3914 <br />1090 <br />9.6E-06 <br />10 <br />9.6E-05 <br />Operation <br />0.51 <br />0.2332 <br />1090 <br />1.9E-06 <br />10 <br />1.9E-05 <br />Infant Exposure <br />Infant <br />2.00 <br />1.2E-05 <br />1.2E-04 <br />Duration <br />Exposure <br />Operation <br />14.00 <br />0.2332 <br />572 <br />2.8E-05 <br />3 <br />8.4E-05 <br />Child Exposure <br />Child <br />14.00 <br />2.8E-05 <br />8.4E-05 <br />Duration <br />Exposure <br />Operation <br />14.00 <br />0.2332 <br />261 <br />9.4E-06 <br />1 <br />9.4E-06 <br />Adult Exposure <br />Adult14.00 <br />9.4E-06 <br />9.4E-06 <br />Duration <br />Exposure <br />Lifetime Exposure <br />Lifetime <br />30.00 <br />5.0E-05 <br />2.1E-04 <br />Duration <br />Exposure <br />*We, along with CARB and SCAQMD, recommend using the more updated and health protective 2015 OEHHA guidance, which includes ASFs. <br />As demonstrated in the table above, the excess cancer risk to adults, children, infants, and during the 3rd <br />trimester of pregnancy at the MEIR located approximately 75 meters away, over the course of Project <br />construction and operation, utilizing age sensitivity factors, are approximately 9.4, 84, 120, and 5.3 in <br />one million, respectively. The excess cancer risk over the course of a residential lifetime (30 years), <br />utilizing age sensitivity factors, is approximately 210 in one million. The infant, child, and lifetime cancer <br />risks all exceed the SCAQMD threshold of 10 in one million, thus resulting in a potentially significant <br />impact not previously addressed or identified by the Addendum. Utilizing age sensitivity factors is the <br />most conservative, health -protective analysis according to the most recent guidance by OEHHA and <br />reflects recommendations from the air district. Results without age sensitivity factors are presented in <br />2s "Supplemental Guidelines for Preparing Risk Assessments for the Air Toxics'Hot Spots' Information and <br />Assessment Act," July 2018, available at: http://www.agmd.gov/docs/default-source/planning/risk- <br />assessment/ab2588supplementalauidelines.pdf, p. 16. <br />"Risk Assessment Guidelines Guidance Manual for Preparation of Health Risk Assessments." OEHHA, February <br />2015, available at: httl)s://oehha.ca.gov/media/downloads/crnr/2015guidancemanual.1)df <br />21 "Risk Assessment Procedures for Rules 1401, 1401.1, and 212." SCAQMD, August 2017, available at: <br />http://www.ag m d.aov/d ocs/default-sou rce/ru le-book/Proposed- <br />Rules/1401/riskassessmentprocedures 2017 080717.pdf, p. 7. <br />18 <br />75C-93 <br />