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Alternatively, a sample of the building material or furnishing can be submitted to a <br />chemical emission rate testing laboratory, such as Berkeley Analytical Laboratory <br />(https://berkelevanalytical.com), to measure the formaldehyde emission rate. <br />4.) Calculate the Total Formaldehyde Emission Rate. For each IAQ Zone, calculate the <br />total formaldehyde emission rate (i.e. µg/h) from the individual formaldehyde emission <br />rates from each of the building material/furnishings as determined in Step 3. <br />5.) Calculate the Indoor Formaldehyde Concentration. For each IAQ Zone, calculate the <br />indoor formaldehyde concentration (µg/ru) from Equation 1 by dividing the total <br />formaldehyde emission rates (i.e. µg/h) as determined in Step 4, by the design minimum <br />outdoor air ventilation rate (m3/h) for the IAQ Zone. <br />Ctn _ Etota( (Equation 1) <br />Qoa <br />where: <br />Cffi = indoor formaldehyde concentration (µg/m3) <br />Etomi = total formaldehyde emission rate (µg/h) into the IAQ Zone. <br />Qoa = design minimum outdoor air ventilation rate to the IAQ Zone (m3/h) <br />The above Equation 1 is based upon mass balance theory, and is referenced in Section <br />3.10.2 "Calculation of Estimated Building Concentrations" of the California Department <br />of Health "Standard Method for the Testing and Evaluation of Volatile Organic Chemical <br />Emissions for hndoor Sources Using Environmental Chambers", (CDPH, 2017). <br />6.) Calculate the Indoor Exposure Cancer and Non -Cancer Health Risks. For each IAQ <br />Zone, calculate the cancer and non -cancer health risks from the indoor formaldehyde <br />concentrations determined in Step 5 and as described in the OEHHA Air Toxics Hot Spots <br />Program Risk Assessment Guidelines; Guidance Manual for Preparation of Health Risk <br />Assessments (OEHHA, 2015). <br />7.) Mitigate Indoor Formaldehyde Exposures of exceeding the CEOA Cancer and/or Non- <br />H <br />