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6.) Calculate the Indoor Exposure Cancer and Non -Cancer Health Risks. For each IAQ Zone, calculate the cancer and non -cancer health risks from the indoor formaldehyde concentrations determined in Step 5 and as described in the OEHHA Air Toxics Hot Spots Program Risk Assessment Guidelines; Guidance Manual for Preparation of Health Risk Assessments (OEHHA, 2015). 7.) Mitigate Indoor Formaldehydeposures of exceeding the CEQA Cancer and/or Non - Cancer Health Risks. In each IAQ Zone, provide mitigation for any formaldehyde exposure risk as determined in Step 6, that exceeds the CEQA cancer risk of 10 per million or the CEQA non -cancer Hazard Quotient of 1.0. Provide the source and/or ventilation mitigation required in all IAQ Zones to reduce the health risks of the chemical exposures below the CEQA cancer and non -cancer health risks. Source mitigation for formaldehyde may include: 1.) reducing the amount materials and/or furnishings that emit formaldehyde 2.) substituting a different material with a lower area -specific emission rate of formaldehyde Ventilation mitigation for formaldehyde emitted from building materials and/or furnishings may include: 1.) increasing the design minimum outdoor air ventilation rate to the IAQ Zone. NOTE: Mitigating the formaldehyde emissions through use of less material/furnishings, or use of lower emitting materials/furnishings, is the preferred mitigation option, as mitigation with increased outdoor air ventilation increases initial and operating costs associated with the heating/cooling systems. Further, we are not asking that the builder "speculate" on what and how much composite materials be used, but rather at the design stage to select composite wood materials based on the formaldehyde emission rates that manufacturers routinely conduct using the California Department of Health "Standard Method for the Testing and Evaluation of 79v6144