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lifetime formaldehyde daily dose is 448 µg/day for continuous exposure in the residences. <br />This exposure represents a cancer risk of 112 per million, which is more than 11 times <br />SCAQMD's CEQA significance threshold for airborne 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 this CEQA cancer risk of 10 per <br />million (e.g. for 12/hour/day occupancy, more than 5 times the OEHHA cancer risk of 10 <br />per million). <br />Appendix A, Indoor Formaldehyde Concentrations and the CARB Formaldehyde ATCM, <br />provides analyses that show utilization of CARB Phase 2 Formaldehyde ATCM materials <br />will not ensure acceptable cancer risks with respect to formaldehyde emissions from <br />composite wood products. <br />Even composite wood products manufactured with CARB certified ultra low emitting <br />formaldehyde (ULEF) resins do not insure that the indoor air will have concentrations of <br />formaldehyde below the CEQA cancer risks. The permissible emission rates for ULEF <br />composite wood products are only 11-15% lower than the CARB Phase 2 emission rates. <br />Only use of composite wood products made with no -added formaldehyde resins (NAF), <br />such as resins made from soy, polyvinyl acetate, or methylene diisocyanate can insure that <br />the CEQA cancer risk of 10 per million is met. <br />The following describes a method that should be used, prior to construction in the <br />environmental review under CEQA, for determining whether the indoor concentrations <br />resulting from the formaldehyde emissions of specific building materials/furnishings <br />selected exceed cancer and non -cancer guidelines. Such a design analyses can be used to <br />identify those materials/furnishings prior to the completion of the City's CEQA review and <br />project approval, that have formaldehyde emission rates that contribute to indoor <br />concentrations that exceed cancer and non -cancer guidelines, so that alternative lower <br />emitting materials/furnishings may be selected and/or higher minimum outdoor air <br />ventilation rates can be increased to achieve acceptable indoor concentrations and <br />incorporated as mitigation measures for this project. <br />76 140 <br />