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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 Indoor 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 CEQA Cancer and/or Non - <br />Cancer Health Risks. In each IAQ Zone, provide mitigation for any formaldehyde exposure <br />risk as determined in Step 6, that exceeds the CEQA cancer risk of 10 per million or the <br />CEQA non -cancer Hazard Quotient of 1.0. <br />Provide the source and/or ventilation mitigation required in all IAQ Zones to reduce the <br />health risks of the chemical exposures below the CEQA cancer and non -cancer health risks. <br />Source mitigation for formaldehyde may include: <br />1.) reducing the amount materials and/or furnishings that emit formaldehyde <br />2.) substituting a different material with a lower area -specific emission rate of <br />formaldehyde <br />Ventilation mitigation for formaldehyde emitted from building materials and/or <br />furnishings may include: <br />1.) increasing the design minimum outdoor air ventilation rate to the IAQ Zone. <br />NOTE: Mitigating the formaldehyde emissions through use of less material/furnishings, or <br />use of lower emitting materials/furnishings, is the preferred mitigation option, as mitigation <br />with increased outdoor air ventilation increases initial and operating costs associated with <br />the heating/cooling systems. <br />9of19 <br />