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4.) Calculate the Total Formaldehyde Emission Rate. For each IAQ Zone, calculate the total formaldehyde emission rate (i.e. µg/h) from the individual formaldehyde emission rates from each of the building material/furnishings as determined in Step 3. 5.) Calculate the Indoor Formaldehyde Concentration. For each IAQ Zone, calculate the indoor formaldehyde concentration (µg/m3) from Equation 1 by dividing the total formaldehyde emission rates (i.e. µg/h) as determined in Step 4, by the design minimum outdoor air ventilation rate (m3/h) for the IAQ Zone. Etotal Cin = (Equation 1) Qoa where: C,n = indoor formaldehyde concentration (µg/m3) Etotal = total formaldehyde emission rate (µg/h) into the IAQ Zone. Qoa = design minimum outdoor air ventilation rate to the IAQ Zone (m3/11) The above Equation 1 is based upon mass balance theory, and is referenced in Section 3.10.2 "Calculation of Estimated Building Concentrations" of the California Department of Health "Standard Method for the Testing and Evaluation of Volatile Organic Chemical Emissions for Indoor Sources Using Environmental Chambers", (CDPH, 2017). 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 Formaldehyde Exposures 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 9of19