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Because these residences will be constiructed with CARE Phase 2 Porrtaldelrydc A'1'CM <br />materials, and be ventilated with the minimum code required amount of outdoor air, the <br />indoor residential formaldehyde concentrations are likely similar to those coocentratims <br />observed in residences built with CARE Phase 2 Formaldehyde ATCM materials, which <br />is a median of 22.4 µglm3 (Chan el. al„ 2019) <br />Assuming that the residential occupants inhale 20 m= of air per day, the average 70-year <br />lifetime formaldehyde daily dose is 448 pglday for continuous exposure in the residences. <br />This exposure represents a cancer risk of 112 per million, which is more than 11 times the <br />South Coast Air Quality Management District CEQA cancer risk of 10 per million <br />(SCAQMD, 2015). For occupants that do not have continuous exposure, the cancer risk <br />will be proportionally less but still substantially over the SCAQMD CEQA cancer risk of <br />10 per million (e_g. for 12llteur/day occupancy, more than 5 times the SCAQMD CEQA <br />cancer risk of 10 per million). <br />The employees ofthe commercial spaces are also expectedte experience significant indoor <br />exposures (e.g., 40 hours perweek, 50 weeks peryear). These exposures for employees are <br />anticipated to result in significant cancer risks resulting from exposures to formaldehyde <br />released by the building materials and furnishing conunonly found in offices, warehouses, <br />residences and hotels. <br />Because these commercial will be constructed with CAR© Phase 2 Formaldehyde ATCM <br />materials, and be ventilated with the minimum code required amount of outdoor air, the <br />indoor warehouse formaldehyde concentrations are likely similar to those concentrations <br />observed in residences built with CARE Phase 2 Formaldehyde ATCM materials, which <br />is a median of 22.4 µg/n13 (Chan et. al., 2019)- <br />Assuming, that the commemial spate employees work 8 hours per day and inhale 20 in Of <br />air perday, the formaldehyde dose per work -day at the offices is 149 ug/day. <br />Assuming that the commercial space employees work 5 days per week and 50 weeks per <br />year for 45 years (start at age 20 and retire at age 65) the average 70-year lifeline <br />4of19 <br />21 <br />75C-41 <br />