11-26-18_AGENDA PACKET - Laserfiche WebLink

Home Browse Search

5 pollution.9 According to the updated guidance, quantified cancer risk should be multiplied by a factor of ten during the third trimester of pregnancy and the first two years of life (infant) and should be multiplied by a factor of three during the child stage of life (2 to 16 years). Furthermore, in accordance with guidance set forth by OEHHA, we used 95th percentile breathing rates for infants.10 Finally, according to SCAQMD guidance, we used a Fraction of Time At Home (FAH) Value of 1 for the 3rd trimester, infant, and child receptors and we used a FAH Value of 0.73 for the adult receptors.11 We used a cancer potency factor of 1.1 (mg/kg‐day)‐1 and an averaging time of 25,550 days. The results of our calculations are shown below. The Maximum Exposed Individual at an Existing Residential Receptor (MEIR) Activity Duration (years) Concentration (µg/m3) Breathing Rate (L/kg‐day) ASF Cancer Risk Construction 0.25 0.4047 361 10 5.5E‐06 3rd Trimester Duration 0.25 3rd Trimester Exposure 5.5E‐06 Construction 1.22 0.4047 1090 10 8.1E‐05 Operation 0.78 0.2534 1090 10 3.2E‐05 Infant Exposure Duration 2.00 Infant Exposure 1.1E‐04 Operation 14.00 0.2534 572 3 9.2E‐05 Child Exposure Duration 14.00 Child Exposure 9.2E‐05 Operation 14.00 0.2534 261 1 1.0E‐05 Adult Exposure Duration 14.00 Adult Exposure 1.02E‐05 Lifetime Exposure Duration 30.00 Lifetime Exposure 2.2E‐04 As demonstrated above, the excess cancer risk to adults, children, infants, and 3rd trimester gestations at a sensitive receptor located approximately 25 meters away, over the course of Project construction and operation, are approximately 10, 92, 110, and 5.5 in one million, respectively. Furthermore, the excess cancer risk over the course of a residential lifetime (30 years) is approximately 220 in one million. Consistent with OEHHA guidance, exposure was assumed to begin in the 3rd trimester stage of pregnancy to provide the most conservative estimates of air quality hazards. The infantile, child, adult, and lifetime cancer risks all exceed the SCAQMD’s threshold of 10 in one million, thus resulting in a potentially significant impact not previously addressed or identified by the DEIR or FEIR. 9 “Risk Assessment Guidelines Guidance Manual for Preparation of Health Risk Assessments.” OEHHA, February 2015, available at: https://oehha.ca.gov/media/downloads/crnr/2015guidancemanual.pdf 10 “Supplemental Guidelines for Preparing Risk Assessments for the Air Toxics ‘Hot Spots’ Information and Assessment Act,” June 5, 2015, available at: http://www.aqmd.gov/docs/default‐source/planning/risk‐ assessment/ab2588‐risk‐assessment‐guidelines.pdf?sfvrsn=6, p. 19 “Risk Assessment Guidelines Guidance Manual for Preparation of Health Risk Assessments.” OEHHA, February 2015, available at: https://oehha.ca.gov/media/downloads/crnr/2015guidancemanual.pdf 11 “Risk Assessment Procedures for Rules 1401, 1401.1, and 212.” SCAQMD, August 2017, available at: http://www.aqmd.gov/docs/default‐source/rule‐book/Proposed‐ Rules/1401/riskassessmentprocedures_2017_080717.pdf, p. 7